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Part No. 10176SL (Rev. A)

Service Manual
(Models 30448 and 30446)

GroundsmasterR 4000--D & 4010--D
Preface
The purpose of this publication is to provide the service
technician with information for troubleshooting, testing
and repair of major systems and components on the
Groundsmaster 4000--D (Model 30448) and 4010--D
(Model 30446).
REFER TO THE OPERATOR’S MANUAL FOR OPERATING, MAINTENANCE
AND ADJUSTMENT
INSTRUCTIONS. For reference, insert a copy of the
Operator’s Manual and Parts Catalog for your machine
into Chapter 2 of this service manual. Additional copies
of the Operator’s Manual and Parts Catalog are available on the internet at www.Toro.com.
The Toro Company reserves the right to change product
specifications or this publication without notice.

This safety symbol means DANGER, WARNING,
or CAUTION, PERSONAL SAFETY INSTRUCTION. When you see this symbol, carefully read
the instructions that follow. Failure to obey the
instructions may result in personal injury.
NOTE: A NOTE will give general information about the
correct operation, maintenance, service, testing or repair of the machine.
IMPORTANT: The IMPORTANT notice will give important instructions which must be followed to prevent damage to systems or components on the
machine.

Groundsmaster 4010--D

Groundsmaster 4000--D

E The Toro Company - 2010, 2012

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Chapter 2 -- Product Records and Maintenance
Product Records . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equivalents and Conversions . . . . . . . . . . . . . . . .
Torque Specifications . . . . . . . . . . . . . . . . . . . . . . .

2 -2 -2 -2 --

1
1
2
3

Chapter 3 -- Kubota Diesel Engine
General Information . . . . . . . . . . . . . . . . . . . . . . . . 3 -- 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -- 3
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . 3 -- 4
KUBOTA WORKSHOP MANUAL, DIESEL ENGINE,
V2403--M--T--E3B SERIES

Chapter 6 -- Axles, Planetaries and Brakes
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 -- 2
General Information . . . . . . . . . . . . . . . . . . . . . . . . 6 -- 3
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . 6 -- 4
Chapter 7 -- Chassis
General Information . . . . . . . . . . . . . . . . . . . . . . . . 7 -- 1
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . 7 -- 2
Chapter 8 -- Cutting Decks

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 2
General Information . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 3
Hydraulic Schematic . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 9
Hydraulic Flow Diagrams . . . . . . . . . . . . . . . . . . . 4 -- 10
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 26
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 30
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 36
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 -- 70
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . 4 -- 72
EATON MODEL 72400 SERVO CONTROLLED PISTON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . .

8 -8 -8 -8 --

2
3
4
6

Cutting
Decks

Chassis

Axles, Planetaries
and Brakes

Chapter 4 -- Hydraulic System

Product Records
and Maintenance

General Information . . . . . . . . . . . . . . . . . . . . . . . . 5 -- 2
Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 -- 3
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 -- 6
Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 -- 17
Electrical System Quick Checks . . . . . . . . . . . . . 5 -- 18
Component Testing . . . . . . . . . . . . . . . . . . . . . . . . 5 -- 20
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . 5 -- 47

Kubota
Diesel Engine

General Safety Instructions . . . . . . . . . . . . . . . . . . 1 -- 2
Jacking Instructions . . . . . . . . . . . . . . . . . . . . . . . . . 1 -- 5
Safety and Instruction Decals . . . . . . . . . . . . . . . . 1 -- 6

Hydraulic
System

Chapter 5 -- Electrical System

Electrical
System

Chapter 1 -- Safety

Safety

Table Of Contents

Groundsmaster 4000--D/4010--D

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Table Of Contents (Continued)

Chapter 10 -- Foldout Drawings
Hydraulic Schematic . . . . . . . . . . . . . . . . . . . . . . . 10 -- 3
Electrical Schematics . . . . . . . . . . . . . . . . . . . . . . 10 -- 4
Wire Harness Drawings . . . . . . . . . . . . . . . . . . . . 10 -- 9

Groundsmaster 4000--D/4010--D

Foldout
Drawings

General Information . . . . . . . . . . . . . . . . . . . . . . . . 9 -- 2
Service and Repairs . . . . . . . . . . . . . . . . . . . . . . . . 9 -- 3
SANDEN SD COMPRESSOR SERVICE GUIDE

Operator
Cab

Chapter 9 -- Operator Cab

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Safety
Table of Contents
GENERAL SAFETY INSTRUCTIONS . . . . . . . . . . . .
Before Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . .
While Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance and Service . . . . . . . . . . . . . . . . . . . .
JACKING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . .
SAFETY AND INSTRUCTION DECALS . . . . . . . . . .

Groundsmaster 4000--D/4010--D

2
2
3
4
5
6

Page 1 -- 1

Safety

Chapter 1

General Safety Instructions
The Groundsmaster 4000-D and 4010--D are tested and
certified by Toro for compliance with existing safety
standards and specifications. Although hazard control
and accident prevention partially are dependent upon
the design and configuration of the machine, these factors are also dependent upon the awareness, concern
and proper training of the personnel involved in the operation, transport, maintenance and storage of the machine. Improper use or maintenance of the machine can
result in injury or death. To reduce the potential for injury
or death, comply with the following safety instructions.

WARNING
To reduce the potential for injury or death,
comply with the following safety instructions.

Before Operating
1. Review and understand the contents of the Operator’s Manual and Operator’s DVD before starting and
operating the vehicle. Become familiar with the controls
and know how to stop the vehicle and engine quickly.
Additional copies of the Operator’s Manual are available
on the internet at www.Toro.com.

4. Since diesel fuel is highly flammable, handle it carefully:

2. Keep all shields, safety devices and decals in place.
If a shield, safety device or decal is defective, illegible or
damaged, repair or replace it before operating the machine. Also tighten any loose nuts, bolts or screws to ensure machine is in safe operating condition.
3. Assure interlock switches are adjusted correctly so
engine cannot be started unless traction pedal is in
NEUTRAL and cutting decks are DISENGAGED.

Safety

Page 1 -- 2

A. Use an approved fuel container.
B. Do not remove fuel tank cap while engine is hot or
running.
C. Do not smoke while handling fuel.
D. Fill fuel tank outdoors and only to within an inch of
the top of the tank, not the filler neck. Do not overfill.
E. Wipe up any spilled fuel.

Groundsmaster 4000--D/4010--D

While Operating
5. Before getting off the seat:

2. Before starting the engine:

A. Ensure that traction pedal is in neutral.
B. Apply the parking brake.

A. Apply the parking brake.
B. Make sure traction pedal is in neutral and the
PTO switch is OFF (disengaged).
C. After engine is started, release parking brake and
keep foot off traction pedal. Machine must not move.
If movement is evident, the traction pedal linkage is
adjusted incorrectly; therefore, shut engine off and
adjust until machine does not move when traction
pedal is released.
3. Do not run engine in a confined area without adequate ventilation. Exhaust fumes are hazardous and
could possibly be deadly.

C. Disengage cutting decks and wait for blades to
stop.
D. Stop engine and remove key from switch.
E. Toro recommends that anytime the machine is
parked (short or long term), the cutting decks should
be lowered to the ground. This relieves hydraulic
pressure from the lift circuit and eliminates the risk of
the cutting decks unexpectedly lowering to the
ground.
F. Do not park on slopes unless wheels are chocked
or blocked.

4. Do not touch engine, muffler or exhaust pipe while
engine is running or soon after it is stopped. These areas
could be hot enough to cause burns.

Groundsmaster 4000--D/4010--D

Page 1 -- 3

Safety

1. Sit on the seat when starting and operating the machine.

Maintenance and Service
1. Before servicing or making adjustments, lower
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Make sure machine is in safe operating condition by
keeping all nuts, bolts and screws tight.
3. Never store the machine or fuel container inside
where there is an open flame, such as near a water heater or furnace.
4. Make sure all hydraulic connectors are tight and all
hydraulic hoses and lines are in good condition before
applying pressure to the system.
5. Keep body and hands away from pin hole leaks in hydraulic lines that eject high pressure hydraulic fluid. Use
cardboard or paper to find hydraulic leaks. Hydraulic
fluid escaping under pressure can penetrate skin and
cause injury. Fluid accidentally injected into the skin
must be surgically removed within a few hours by a doctor familiar with this form of injury or gangrene may result.
6. Before disconnecting or performing any work on the
hydraulic system, all pressure in system must be relieved by lowering cutting decks to the ground and stopping engine.
7. If major repairs are ever needed or assistance is desired, contact an Authorized Toro Distributor.
8. To reduce potential fire hazard, keep engine area
free of excessive grease, grass, leaves and dirt. Clean
protective screen on machine frequently.
9. If engine must be running to perform maintenance or
an adjustment, keep hands, feet, clothing and other
parts of the body away from cutting decks and other
moving parts. Keep bystanders away.
10.Do not overspeed the engine by changing governor
setting. To assure safety and accuracy, check maximum
engine speed.

12.Disconnect battery before servicing the machine.
Disconnect negative cable first and positive cable last.
If battery voltage is required for troubleshooting or test
procedures, temporarily connect the battery. Reconnect
positive cable first and negative cable last.
13.Battery acid is poisonous and can cause burns.
Avoid contact with skin, eyes and clothing. Protect your
face, eyes and clothing when working with a battery.
14.Battery gases can explode. Keep cigarettes, sparks
and flames away from the battery.
15.At the time of manufacture, the machine conformed
to the safety standards for riding mowers. To assure optimum performance and continued safety certification of
the machine, use genuine Toro replacement parts and
accessories. Replacement parts and accessories made
by other manufacturers may result in non-conformance
with the safety standards and the warranty may be
voided.
16.When changing attachments, tires or performing
other service, use correct blocks, hoists and jacks.
Make sure machine is parked on a solid level surface
such as a concrete floor. Prior to raising the machine, remove any attachments that may interfere with the safe
and proper raising of the machine. Always chock or
block wheels. Use appropriate jack stands to support
the raised machine. If the machine is not properly supported by jack stands, the machine may move or fall,
which may result in personal injury (see Jacking Instructions in this chapter).
17.When welding on machine, disconnect all battery
cables to prevent damage to machine electronic equipment. Disconnect negative battery cable first and positive cable last. Also, disconnect wire harness connector
from both of the TEC controllers and disconnect the terminal connector from the alternator. Attach welder
ground cable no more than two (2) feet (0.61 meters)
from the welding location.

11. Shut engine off before checking or adding oil to the
crankcase.

Safety

Page 1 -- 4

Groundsmaster 4000--D/4010--D

Jacking Instructions

When changing attachments, tires or performing other service, use correct jacks and supports. Make sure machine is parked on a solid,
level surface such as a concrete floor. Prior to
raising machine, remove any attachments that
may interfere with the safe and proper raising of
the machine. Always chock or block wheels. Use
jack stands to support the raised machine. If the
machine is not properly supported by jack
stands, the machine may move or fall, which
may result in personal injury.

Safety

CAUTION

Figure 1
1. Front jacking point

2. Front tire

Jacking the Front End (Fig. 1)
1. Set parking brake and chock both rear tires to prevent the machine from moving.
2. Position jack securely under the frame, just to the inside of the front tire. Jack front wheel off the ground.
3. Once the machine is raised, position jack stand under the frame as close to the wheel as possible to support the machine.
Jacking the Rear End (Fig. 2)

1. Place jack securely under the center of rear axle.
2. Chock both front tires. Jack rear of machine off the
ground.

Figure 2
1. Rear axle jacking point

2. Rear tire

3. Once the machine is raised, use jack stands under
the axle to support the machine.

Groundsmaster 4000--D/4010--D

Page 1 -- 5

Safety

Safety and Instruction Decals
Numerous safety and instruction decals are affixed to
your Groundsmaster machine. If any decal becomes illegible or damaged, install a new decal. Decal part numbers are listed in your Parts Catalog.

Safety

Page 1 -- 6

Groundsmaster 4000--D/4010--D

Chapter 2

Product Records and Maintenance
Table of Contents
1
1
2
2
2
3
3
3

Product Records
and Maintenance

PRODUCT RECORDS . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EQUIVALENTS AND CONVERSIONS . . . . . . . . . . .
Decimal and Millimeter Equivalents . . . . . . . . . . . .
U.S. to Metric Conversions . . . . . . . . . . . . . . . . . . .
TORQUE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . .
Fastener Identification . . . . . . . . . . . . . . . . . . . . . . .
Using a Torque Wrench with an Offset Wrench . .
Standard Torque for Dry, Zinc Plated and
Steel Fasteners (Inch Series) . . . . . . . . . . . . . . .
Standard Torque for Dry, Zinc Plated and
Steel Fasteners (Metric) . . . . . . . . . . . . . . . . . . . .
Other Torque Specifications . . . . . . . . . . . . . . . . . .
Conversion Factors . . . . . . . . . . . . . . . . . . . . . . . . . .

4
5
6
6

Product Records
Insert Operator’s Manuals and Parts Catalogs for your
Groundsmaster at the end of this chapter. Additionally,
if any optional equipment or accessories have been
installed to your machine, insert the Installation Instructions, Operator’s Manuals and Parts Catalogs for those
options at the end of this chapter.

Maintenance
Maintenance procedures and recommended service intervals for your Groundsmaster are covered in the Operator’s Manual. Refer to that publication when performing
regular equipment maintenance.

Groundsmaster 4000--D/4010--D

Page 2 -- 1

Product Records and Maintenance

Equivalents and Conversions

0.09375

Product Records and Maintenance

Page 2 -- 2

Groundsmaster 4000--D/4010--D

Torque Specifications

These Torque Specifications for the installation and
tightening of fasteners shall apply to all fasteners which
do not have a specific requirement identified in this Service Manual. The following factors shall be considered
when applying torque: cleanliness of the fastener, use
of a thread sealant (e.g. Loctite), degree of lubrication
on the fastener, presence of a prevailing torque feature
(e.g. Nylock nut), hardness of the surface underneath
the fastener’s head or similar condition which affects the
installation.

As noted in the following tables, torque values should be
reduced by 25% for lubricated fasteners to achieve
the similar stress as a dry fastener. Torque values may
also have to be reduced when the fastener is threaded
into aluminum or brass. The specific torque value
should be determined based on the aluminum or brass
material strength, fastener size, length of thread engagement, etc.
The standard method of verifying torque shall be performed by marking a line on the fastener (head or nut)
and mating part, then back off fastener 1/4 of a turn.
Measure the torque required to tighten the fastener until
the lines match up.

Fastener Identification

Grade 1

Grade 5

Grade 8

Class 8.8

Inch Series Bolts and Screws

Class 10.9

Metric Bolts and Screws

Figure 1

Figure 2

Using a Torque Wrench with an Offset Wrench
Use of an offset wrench (e.g. crowfoot wrench) will affect
torque wrench calibration due to the effective change of
torque wrench length. When using a torque wrench with
an offset wrench, multiply the listed torque recommendation by the calculated torque conversion factor (Fig.
3) to determine proper tightening torque. Tightening
torque when using a torque wrench with an offset
wrench will be lower than the listed torque recommendation.

If the listed torque recommendation for a fastener is
from 76 to 94 ft--lb, the proper torque when using this
torque wrench with an offset wrench would be from 72
to 89 ft--lb.
Offset wrench

Example: The measured effective length of the torque
wrench (distance from the center of the handle to the
center of the square drive) is 18”.
The measured effective length of the torque wrench with
the offset wrench installed (distance from the center of
the handle to the center of the offset wrench) is 19”.
The calculated torque conversion factor for this torque
wrench with this offset wrench would be 18 / 19 = 0.947.
Groundsmaster 4000--D/4010--D

Page 2 -- 3

(effective length of
torque wrench)
A

Torque wrench

B
(effective length of torque
wrench + offset wrench)

TORQUE CONVERSION FACTOR = A / B
Figure 3
Product Records and Maintenance

Product Records
and Maintenance

Recommended fastener torque values are listed in the
following tables. For critical applications, as determined
by Toro, either the recommended torque or a torque that
is unique to the application is clearly identified and specified in this Service Manual.

Standard Torque for Dry, Zinc Plated and Steel Fasteners (Inch Series)

Thread Size

# 6 -- 32 UNC

Grade 1, 5 &
8 with Thin
Height Nuts

SAE Grade 1 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 2 or Stronger Nuts)

in--lb

N--cm

10 + 2

13 + 2

147 + 23

# 6 -- 40 UNF
# 8 -- 32 UNC

13 + 2

25 + 5

282 + 30

# 8 -- 36 UNF
# 10 -- 24 UNC

18 + 2

30 + 5

339 + 56

# 10 -- 32 UNF

SAE Grade 5 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 2 or Stronger Nuts)

SAE Grade 8 Bolts, Screws, Studs &
Sems with Regular Height Nuts
(SAE J995 Grade 5 or Stronger Nuts)

in--lb

N--cm

in--lb

N--cm

15 + 2

169 + 23

23 + 3

262 + 34

17 + 2

192 + 23

25 + 3

282 + 34

29 + 3

328 + 34

41 + 5

463 + 56

31 + 4

350 + 45

43 + 5

486 + 56

42 + 5

475 + 56

60 + 6

678 + 68

48 + 5

542 + 56

68 + 7

768 + 79

1/4 -- 20 UNC

48 + 7

53 + 7

599 + 79

100 + 10

1130 + 113

140 + 15

1582 + 169

1/4 -- 28 UNF

53 + 7

65 + 10

734 + 113

115 + 12

1299 + 136

160 + 17

1808 + 192

5/16 -- 18 UNC

115 + 15

105 + 15

1186 + 169

200 + 25

2260 + 282

300 + 30

3390 + 339

5/16 -- 24 UNF

138 + 17

128 + 17

1446 + 192

225 + 25

2542 + 282

325 + 33

3672 + 373

ft--lb

N--m

ft--lb

N--m

ft--lb

N--m

3/8 -- 16 UNC

16 + 2

22 + 3

30 + 3

41 + 4

43 + 5

58 + 7

3/8 -- 24 UNF

17 + 2

18 + 2

24 + 3

35 + 4

47 + 5

50 + 6

68 + 8

7/16 -- 14 UNC

27 + 3

37 + 4

50 + 5

68 + 7

70 + 7

95 + 9

7/16 -- 20 UNF

29 + 3

39 + 4

55 + 6

75 + 8

77 + 8

104 + 11

1/2 -- 13 UNC

30 + 3

48 + 7

65 + 9

75 + 8

102 + 11

105 + 11

142 + 15

1/2 -- 20 UNF

32 + 4

53 + 7

72 + 9

85 + 9

115 + 12

120 + 12

163 + 16

5/8 -- 11 UNC

65 + 10

88 + 12

119 + 16

150 + 15

203 + 20

210 + 21

285 + 28

5/8 -- 18 UNF

75 + 10

95 + 15

129 + 20

170 + 18

230 + 24

240 + 24

325 + 33

3/4 -- 10 UNC

93 + 12

140 + 20

190 + 27

265 + 27

359 + 37

375 + 38

508 + 52

3/4 -- 16 UNF

115 + 15

165 + 25

224 + 34

300 + 30

407 + 41

420 + 43

569 + 58

7/8 -- 9 UNC

140 + 20

225 + 25

305 + 34

430 + 45

583 + 61

600 + 60

813 + 81

7/8 -- 14 UNF

155 + 25

260 + 30

353 + 41

475 + 48

644 + 65

667 + 66

904 + 89

NOTE: Reduce torque values listed in the table above
by 25% for lubricated fasteners. Lubricated fasteners
are defined as threads coated with a lubricant such as
engine oil or thread sealant such as Loctite.
NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.
Product Records and Maintenance

NOTE: The nominal torque values listed above for
Grade 5 and 8 fasteners are based on 75% of the minimum proof load specified in SAE J429. The tolerance is
approximately + 10% of the nominal torque value. Thin
height nuts include jam nuts.

Page 2 -- 4

Groundsmaster 4000--D/4010--D

Standard Torque for Dry, Zinc Plated and Steel Fasteners (Metric Series)
Class 8.8 Bolts, Screws and Studs with
Regular Height Nuts
(Class 8 or Stronger Nuts)

Class 10.9 Bolts, Screws and Studs with
Regular Height Nuts
(Class 10 or Stronger Nuts)

M5 X 0.8

57 + 6 in--lb

644 + 68 N--cm

78 + 8 in--lb

881 + 90 N--cm

M6 X 1.0

96 + 10 in--lb

1085 + 113 N--cm

133 + 14 in--lb

1503 + 158 N--cm

M8 X 1.25

19 + 2 ft--lb

26 + 3 N--m

28 + 3 ft--lb

38 + 4 N--m

M10 X 1.5

38 + 4 ft--lb

52 + 5 N--m

54 + 6 ft--lb

73 + 8 N--m

M12 X 1.75

66 + 7 ft--lb

90 + 10 N--m

93 + 10 ft--lb

126 + 14 N--m

M16 X 2.0

166 + 17 ft--lb

225 + 23 N--m

229 + 23 ft--lb

310 + 31 N--m

M20 X 2.5

325 + 33 ft--lb

440 + 45 N--m

450 + 46 ft--lb

610 + 62 N--m

NOTE: The nominal torque values listed above are
based on 75% of the minimum proof load specified in
SAE J1199. The tolerance is approximately + 10% of the
nominal torque value.

NOTE: Torque values may have to be reduced when
installing fasteners into threaded aluminum or brass.
The specific torque value should be determined based
on the fastener size, the aluminum or base material
strength, length of thread engagement, etc.

Groundsmaster 4000--D/4010--D

Page 2 -- 5

Product Records and Maintenance

Product Records
and Maintenance

Thread Size

Other Torque Specifications
SAE Grade 8 Steel Set Screws

Wheel Bolts and Lug Nuts

Recommended Torque

Thread Size

Square Head

Hex Socket

1/4 -- 20 UNC

140 + 20 in--lb

73 + 12 in--lb

5/16 -- 18 UNC

215 + 35 in--lb

145 + 20 in--lb

3/8 -- 16 UNC

35 + 10 ft--lb

18 + 3 ft--lb

1/2 -- 13 UNC

75 + 15 ft--lb

50 + 10 ft--lb

Recommended Torque**

7/16 -- 20 UNF
Grade 5

65 + 10 ft--lb

88 + 14 N--m

1/2 -- 20 UNF
Grade 5

80 + 10 ft--lb

108 + 14 N--m

M12 X 1.25
Class 8.8

80 + 10 ft--lb

108 + 14 N--m

M12 X 1.5
Class 8.8

80 + 10 ft--lb

108 + 14 N--m

** For steel wheels and non--lubricated fasteners.
Thread Cutting Screws
(Zinc Plated Steel)
Type 1, Type 23 or Type F
Thread Size

Baseline Torque*

No. 6 -- 32 UNC

20 + 5 in--lb

No. 8 -- 32 UNC

Thread Cutting Screws
(Zinc Plated Steel)
Thread
Size

Threads per Inch

Baseline Torque*

Type A

Type B

No. 6

20 + 5 in--lb

30 + 5 in--lb

No. 8

30 + 5 in--lb

No. 10 -- 24 UNC

38 + 7 in--lb

No. 10

38 + 7 in--lb

1/4 -- 20 UNC

85 + 15 in--lb

No. 12

85 + 15 in--lb

5/16 -- 18 UNC

110 + 20 in--lb

3/8 -- 16 UNC

200 + 100 in--lb

* Hole size, material strength, material thickness and finish must be considered when determining specific
torque values. All torque values are based on non--lubricated fasteners.

Conversion Factors
in--lb X 11.2985 = N--cm
ft--lb X 1.3558 = N--m

Product Records and Maintenance

N--cm X 0.08851 = in--lb
N--m X 0.7376 = ft--lb

Page 2 -- 6

Groundsmaster 4000--D/4010--D

Chapter 3

Kubota Diesel Engine
Table of Contents

Groundsmaster 4000--D/4010--D

Page 3 -- 1

Kubota
Diesel Engine

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Stopping the Engine . . . . . . . . . . . . . . . . . . . . . . . . . 3
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . . 4
Air Filter System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Exhaust System . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Check Fuel Lines and Connections . . . . . . . . . . . 9
Empty and Clean Fuel Tank . . . . . . . . . . . . . . . . . 9
Fuel Tank Removal . . . . . . . . . . . . . . . . . . . . . . . . 9
Fuel Tank Installation . . . . . . . . . . . . . . . . . . . . . . . 9
Radiator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Engine Removal . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Engine Installation . . . . . . . . . . . . . . . . . . . . . . . . 15
Spring Coupler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
KUBOTA WORKSHOP MANUAL, DIESEL ENGINE,
03--M--E3B SERIES

Kubota Diesel Engine

Specifications
Item

Description

Make / Designation

Kubota Model V2403--M--T--E3B: 4--Cycle, 4 Cylinder,
Water Cooled, Turbocharged, Diesel Engine

Bore

3.43 in (87.0 mm)

Stroke

4.031 in (102.4 mm)
148.5 in3 (2434 cc)

Total Displacement
Firing Order

1 (closest to gear case end) -- 3 -- 4 (closest to flywheel end) -- 2

Combustion Chamber

Spherical Type (E--TVCS)

Compression Ratio

23.0:1

Direction of Rotation

Counterclockwise (viewed from flywheel)

Fuel

Diesel or Biodiesel (up to B20) Fuel with Low or
Ultra Low Sulfur Content

Fuel Capacity

19 U.S. gallons (72 liters)

Fuel Injection Pump

Denso PFR 4M Type Mini Pump

Injection Nozzle

Denso OPD Mini Nozzle

Governor

Centrifugal Mechanical

Low Idle (no load)

1425 + 50 RPM

High Idle (no load)

2870 + 50/--120 RPM

Engine Oil

API CH--4, CI--4 or higher

Engine Oil Viscosity

See Operator’s Manual

Crankcase Oil Capacity

10 U.S. quarts (9.5 liters) with Filter

Oil Pump

Trochoid Type

Coolant Capacity
Groundsmaster 4000--D
Groundsmaster 4010--D

13 U.S. quarts (12.3 liters)
17 U.S. quarts (16.1 liters)

Starter

12 VDC, 2.0 kW

Alternator/Regulator
Groundsmaster 4000--D
Groundsmaster 4010--D

12 VDC
40 amp
90 amp

Engine Dry Weight

Kubota Diesel Engine

419 U.S. pounds (190 kg)

Page 3 -- 2

Groundsmaster 4000--D/4010--D

General Information
This Chapter gives information about specifications and
repair of the diesel engine used in Groundsmaster
4000--D and 4010--D machines.
General maintenance procedures are described in your
Operator’s Manual. Information on engine troubleshooting, testing, disassembly and reassembly is identified in
the Kubota Workshop Manual, Diesel Engine,
03--M--E3B that is included at the end of this section.
Most repairs and adjustments require tools which are
commonly available in many service shops. Special

tools are described in the Kubota Workshop Manual,
Diesel Engine, 03--M--E3B. The use of some specialized test equipment is explained. However, the cost of
the test equipment and the specialized nature of some
repairs may dictate that the work be done at an engine
repair facility.
Service and repair parts for Kubota engines are supplied through your Authorized Toro Distributor. If no
parts list is available, be prepared to provide your distributor with the Toro model and serial number of your machine.

Operator’s Manual
Kubota
Diesel Engine

The Operator’s Manual provides information regarding
the operation, general maintenance and maintenance
intervals for your Groundsmaster machine. Refer to that
publication for additional information when servicing the
machine.

Stopping the Engine
IMPORTANT: Before stopping the engine after
mowing or full load operation, cool the turbo-charger by allowing the engine to run at low idle speed
for five (5) minutes. Failure to do so may lead to turbo-charger trouble.

Groundsmaster 4000--D/4010--D

Page 3 -- 3

Kubota Diesel Engine

Service and Repairs
Air Filter System

RIGHT
1

FRONT

6 12

12 to 15 in--lb
(1.4 to 1.6 N--m)

13 14

4
15
8

11
2
5

10
18

VACUATOR
DIRECTION

Figure 1
1.
2.
3.
4.
5.
6.

Air cleaner hose
Hose clamp
Air cleaner assembly
Indicator
Air cleaner strap
Lock nut (2 used)

Kubota Diesel Engine

7.
8.
9.
10.
11.
12.

Hose clamp
Air cleaner hose
Hose clamp
Cap screw (2 used)
Flat washer (4 used)
Spring (2 used)

Page 3 -- 4

13.
14.
15.
16.
17.
18.

Flat washer (2 used)
Cap screw (2 used)
Adapter
Lock nut (2 used)
Flat washer (2 used)
Overflow bracket

Groundsmaster 4000--D/4010--D

Removal (Fig. 1)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

2
4

2. Raise and support hood.

3. Remove air cleaner components as needed using
Figure 1 as a guide.
3

Installation (Fig. 1)

1. Assemble air cleaner system using Figure 1 as a
guide.

Figure 2
1. Air cleaner housing
2. Safety filter element
3. Air filter element

4. Air cleaner cover
5. Vacuator valve

A. If service indicator (item 4) and adapter (item 15)
were removed from air cleaner housing, apply thread
sealant to adapter threads before installing adapter
and indicator to housing. Install adapter so that
grooves in adapter hex and adapter filter element are
installed toward service indicator (Fig. 3). Torque indicator from 12 to 15 in--lb (1.4 to 1.6 N--m).

2
3

B. When securing air cleaner in air cleaner strap,
tighten cap screws (item 14) only enough to prevent
air cleaner from rotating in strap.

2. When installing air cleaner hose (item 1) between air
cleaner and turbo--charger (Fig. 4):
A. Make sure that hose does not contact engine
valve cover. To ensure clearance, move and/or rotate air cleaner body in air cleaner strap.

Kubota
Diesel Engine

IMPORTANT: Any leaks in the air filter system will
cause serious engine damage. Make sure that all air
cleaner components are in good condition and are
properly secured during assembly.

Figure 3
1. Air cleaner assembly
2. Service indicator

B. Position hose to allow maximum clearance between air cleaner hose and muffler bracket.

3. Adapter

4
1

3. Lower and secure hood.

3
2

Figure 4
1. Air cleaner hose
2. Muffler bracket

Groundsmaster 4000--D/4010--D

Page 3 -- 5

3. Air cleaner strap
4. Air cleaner slots

Kubota Diesel Engine

Exhaust System
16 to 22 ft--lb
(21 to 29 N--m)

16 to 22 ft--lb
(21 to 29 N--m)

14
3

2
15
16

16 to 22 ft--lb
(21 to 29 N--m)

13 ft--lb
(17.6 N--m)

6
8

RIGHT
FRONT

6
10

16 to 22 ft--lb
(21 to 29 N--m)

Figure 5
1.
2.
3.
4.
5.
6.

Muffler
Muffler bracket
Exhaust pipe
Flange head screw (4 used)
Exhaust gasket
Lock nut (2 used)

Kubota Diesel Engine

7.
8.
9.
10.
11.

Cap screw (2 used)
Flat washer (4 used)
Spacer (2 used)
Rubber hanger
Flange nut (4 used)

Page 3 -- 6

12.
13.
14.
15.
16.

Flange head screw (2 used)
Engine mount
Muffler clamp
Exhaust mount
Flange head screw (2 used)

Groundsmaster 4000--D/4010--D

Removal (Fig. 5)

CAUTION

The muffler and exhaust pipe may be hot. To
avoid possible burns, allow the engine and exhaust system to cool before working on the muffler.

E
B

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

2. Raise and support hood.

Installation (Fig. 5)

A
Figure 6

IMPORTANT: If exhaust studs were removed from
engine cylinder head, thoroughly clean threads in
head and apply Loctite #277 (or equivalent) to stud
threads before installing studs into head.
NOTE: Make sure muffler flange and exhaust manifold
sealing surfaces are free of debris or damage that may
prevent a tight seal.
1. Install new exhaust gasket if original gasket is damaged or torn.
IMPORTANT: Failure to follow the suggested muffler fastener sequence may result in premature muffler failure.
2. Install exhaust system components to the engine using Figure 5 as a guide. Hand tighten exhaust system
fasteners and then torque in the sequence shown in Fig.
6 as follows:
A. Torque lock nuts used on rubber hanger cap
screws from 16 to 22 ft--lb (21 to 29 N--m).
B. Torque flange head screws that secure muffler
flange to engine from 16 to 22 ft--lb (21 to 29 N--m).
C. Torque flange nuts that secure muffler to muffler
bracket from 16 to 22 ft--lb (21 to 29 N--m).
D. Torque flange nuts that secure muffler bracket to
engine from 16 to 22 ft--lb (21 to 29 N--m).
E. Torque flange screws that secure exhaust mount
to engine to 13 ft--lb (17.6 N--m).
3. Tailpipe should have equal clearance between frame
and engine after installation.
4. Lower and secure hood.
Groundsmaster 4000--D/4010--D

Page 3 -- 7 Rev. A

Kubota Diesel Engine

Kubota
Diesel Engine

3. Remove exhaust system components from the engine as necessary using Figure 5 as a guide.

Fuel System

37
38
40

29
27
30

25
24

35
34

29
2

1
21

32
5

20
7

RIGHT

18 17 1615

FRONT

8
9
10

12
11

135 to 165 ft--lb
(183 to 223 N--m)

13
60 to 80 in--lb
(7 to 9 N--m)

Figure 7
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

Fuel tank
Fuel tank bracket
ROPS assembly
Washer head screw (3 used)
Tank support assembly
Insulated clip (3 used)
Flange nut (6 used)
Cap screw (4 used)
Flat washer (4 used)
Cap screw (4 used)
Carriage screw (2 used)
Washer (2 used)
Battery strap
Battery

Kubota Diesel Engine

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

Retaining ring (2 used)
Battery cover
Flat washer (2 used)
Knob (2 used)
Battery plate
Negative cable
Positive cable
Carriage screw
Gasket
Bushing (3 used)
Stand pipe
Fuel sender
Lock washer (5 used)

Page 3 -- 8

28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Phillips head screw (5 used)
Vent hose
Hose clamp
Elbow fitting (2 used)
Fuel cap
Locking flange nut (2 used)
Speed nut (4 used)
Tank cover (2 used)
Phillips head screw (4 used)
Vent tube
Overflow hose
Hose clamp
Fuel supply hose

Groundsmaster 4000--D/4010--D

Fuel Tank Installation (Fig. 7)

DANGER

1. Install fuel tank using Figure 7 as a guide.

Check Fuel Lines and Connections

A. Torque two (2) flange nuts (item 7) that secure the
fuel tank to the frame from 60 to 80 in--lb (7 to 9
N--m).
2. Install two (2) tank covers to ROPS assembly.
3. Connect fuel supply hose to the standpipe and vent
and overflow hoses to the elbow fittings (Fig. 8). Secure
hoses with clamps.
4. Connect wire harness connections to the fuel sender.
A. Connect white wire to the center terminal and
black wire to any of the screws that secure the fuel
sender to the fuel tank.

Check fuel lines and connections periodically as recommended in the Operator’s Manual. Check lines for deterioration, damage, leaking or loose connections.
Replace hoses, clamps and connections as necessary.

B. Apply skin--over grease to the wire terminal connections.

Empty and Clean Fuel Tank
Empty and clean the fuel tank periodically as recommended in the Operator’s Manual. Also, empty and
clean the fuel tank if the fuel system becomes contaminated or if the machine is to be stored for an extended
period.
To clean fuel tank, flush tank out with clean diesel fuel.
Make sure tank is free of contaminates and debris.
Fuel Tank Removal (Fig. 7)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

CAUTION
Connecting battery cables to the wrong battery
post could result in personal injury and/or damage to the electrical system.
5. Position battery in machine. Connect positive battery
cable first and then negative battery cable. Install battery strap and cover.
6. Lower and secure operator seat and hood.
7. Fill fuel tank.

2. Raise and support operator seat and hood.
3. Remove battery cover and strap. Disconnect negative battery cable first and then positive battery cable.
Remove battery from machine.

4. Use a fuel transfer pump to remove fuel from the fuel
tank and into a suitable container.
5. Disconnect wire harness connections from the fuel
sender (item 26).
2

6. Disconnect fuel supply hose from standpipe and
vent and overflow hoses from elbow fittings in top of tank
(Fig. 8).
7. Remove phillips head screws that secure two (2)
tank covers (item 35) to ROPS assembly. Remove tank
covers.

4
Figure 8
1. Fuel supply hose
2. Vent hose

3. Overflow hose
4. Fuel sender

8. Remove fuel tank using Figure 7 as a guide.
Groundsmaster 4000--D/4010--D

Page 3 -- 9

Kubota Diesel Engine

Kubota
Diesel Engine

Because diesel fuel is highly flammable, use caution when storing or handling it. Do not smoke
while filling the fuel tank. Do not fill fuel tank
while engine is running, hot or when machine is
in an enclosed area. Always fill fuel tank outside
and wipe up any spilled diesel fuel before starting the engine. Store fuel in a clean, safety--approved container and keep cap in place. Use diesel fuel for the engine only; not for any other
purpose.

Radiator

RIGHT

FRONT

24
25

50
8

54
6
61

49
41
25

59
4
38

11
55

49
10
60
57

32
13

42
44

35
2

34
48
39

47
33
3

Figure 9
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.

Radiator cap
Foam strip (2 used)
Foam strip (2 used)
Lower radiator hose
Upper radiator hose
Clamp (4 used)
Lower radiator shroud
Temperature sender
Radiator
Hose clamp (3 used)
Hose (2 used)
Screw (4 used)
Rubber grommet
Flange nut (4 used)
Retaining ring (2 used)
Knob (2 used)
Bulb seal
Top radiator support
Retaining ring (2 used)
Oil cooler bracket
Oil cooler

Kubota Diesel Engine

22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.

Carriage screw (2 used)
90o hydraulic fitting (2 used)
Cap screw (6 used)
Lock washer (6 used)
Oil cooler mount plate (2 used)
Upper radiator shroud
Flange nut (10 used)
Foam plug (2 used)
Lock nut (6 used)
Foam strip
Base bracket
Flange head screw (6 used)
Bulb seal (2 used)
Grommet (2 used)
Cover
Flange head screw (4 used)
Plate (2 used)
Flat washer (2 used)
Knob (2 used)
Cap screw (6 used)
Cable tie

Page 3 -- 10

43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.

Coolant reservoir
Tank bracket
Flat washer (10 used)
Foam pad
Cap screw (7 used)
Foam seal
Cap screw (3 used)
LH radiator support
RH radiator support
Flange nut (6 used)
Cap screw (6 used)
Fan motor bracket
Grommet (2 used)
Grommet
Harness clip
R--clamp (2 used)
Foam pad
Reservoir cap
Air cleaner hose
Plug

Groundsmaster 4000--D/4010--D

Removal (Fig. 9)

Installation (Fig. 9)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

1. Remove all plugs placed during the removal procedure.

CAUTION
Do not open radiator cap or drain coolant if the
radiator or engine is hot. Pressurized, hot coolant can escape and cause burns.
Ethylene--glycol antifreeze is poisonous. Dispose of coolant properly or store it in a properly
labeled container away from children and pets.
3. Drain radiator into a suitable container using the radiator drain. The radiator drain hose is located near the
engine oil filter.
4. Disconnect upper and lower radiator hoses from the
radiator.
5. Remove air cleaner hose (item 61).
6. Disconnect reservoir hose from the vent tube near
the radiator cap.
7. Detach upper radiator shroud from the radiator and
lower radiator shroud. Remove upper shroud from machine.
8. Remove fasteners that secure lower radiator shroud
to radiator.
9. Remove six (6) flange head screws and flange nuts
that secure fan motor bracket to radiator.
10.Position lower radiator shroud and fan motor bracket
assembly away from radiator.

2. Carefully position radiator to the support frame. Secure radiator to the support frame with cap screws and
flange nuts.
3. If temperature sender (item 8) was removed from radiator, install new O--ring on sender and thread sender
into radiator. Torque sender from 9 to 11 ft--lb (12.3 to
14.9 N--m). Reconnect wire harness connector to sender.
4. Position lower radiator shroud and fan motor bracket
assembly to the radiator.
5. Secure fan motor bracket to radiator with six (6)
flange head screws and flange nuts. Position bracket as
far as possible from radiator to maximize distance between radiator and fan motor location.
6. Position upper radiator shroud to lower radiator
shroud to radiator. Secure shrouds with removed fasteners.
7. Attach radiator shroud assembly to the radiator with
cap screws and flat washers. Make sure that clearance
between shroud and cooling fan is at least 0.180” (4.6
mm) at all points.
8. Connect reservoir hose to the vent tube near the radiator cap.
9. Connect upper and lower radiator hoses to the radiator.
10.Reinstall air cleaner hose (item 61).
11. Make sure radiator drain is closed. Fill radiator with
coolant.
12.Close and secure hood.

11. Disconnect wire harness connector from temperature sender (item 8).
12.Remove cap screws and flange nuts securing the radiator to the support frame. Carefully pull radiator from
the machine.
13.Plug all radiator and hose openings to prevent contamination.

Groundsmaster 4000--D/4010--D

Page 3 -- 11

Kubota Diesel Engine

Kubota
Diesel Engine

2. Open and support hood.

Engine

RIGHT
1

FRONT

24
2

3
4

5
22
6

21
11
12

13
14

9
10

16
19

28 to 32 ft--lb
(38 to 43 N--m)

Loctite #242

28 to 32 ft--lb
(38 to 43 N--m)

29 to 33 ft--lb
(40 to 44 N--m)

Figure 10
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

Engine
Cap screw (4 used)
LH engine mount
Lock washer
Cap screw
Lock washer (5 used)
Cap screw (5 used)
Engine support (4 used)
Flange nut (12 used)
Rebound washer (4 used)

Kubota Diesel Engine

11.
12.
13.
14.
15.
16.
17.
18.
19.

Cap screw (8 used)
Spring coupler
Washer (14 used)
Cap screw (6 used)
Flywheel plate
Cap screw (4 used)
Cap screw (2 used)
Lock washer (2 used)
LH engine mount

Page 3 -- 12

20.
21.
22.
23.
24.
25.
26.
27.
28.

Cap screw (4 used)
RH engine mount
Cap screw (PTO manifold)
Lock washer
Ground cable
Cap screw
Lock washer
RH engine mount
Ground harness

Groundsmaster 4000--D/4010--D

Engine Removal (Fig. 10)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

2. Remove battery from machine (see Battery Service
in the Service and Repairs section of Chapter 5 -- Electrical System).

3. Raise and support hood.

CAUTION
Figure 11
1. Alternator

2. Temperature sender

Kubota
Diesel Engine

Do not open radiator cap or drain coolant if the
radiator or engine is hot. Pressurized, hot coolant can escape and cause burns.
Ethylene--glycol antifreeze is poisonous. Dispose of coolant properly or store it in a properly
labeled container away from children and pets.
4. Drain coolant from the radiator into a suitable container (see Radiator Removal in this section). Disconnect upper and lower hoses from the radiator.

CAUTION
The muffler and exhaust pipe may be hot. To
avoid possible burns, allow the exhaust system
to cool before working on or near the muffler.

Figure 12
1. Glow plug wire
2. Glow plug lead

3. Cylinder #4 glow plug

5. Remove exhaust system from engine (see Exhaust
System Removal in this section).
6. Remove air cleaner system from engine (see Air Filter System Removal in this section).

7. Note location of cable ties used to secure wire harness to the machine. Disconnect wires and/or electrical
connections from the following electrical components:
A. The temperature sender and alternator (Fig 11).
B. The glow plugs (Fig. 12).

C. The engine run solenoid.
D. Battery, frame and wire harness ground at the engine block.
E. The electric starter and low oil pressure switch
(near electric starter).

Figure 13
1. Cable swivel
2. Cable stop
3. Throttle cable

4. Cable clamp
5. Fuel supply hose

F. The air conditioning compressor (Groundsmaster 4010--D machines).

Groundsmaster 4000--D/4010--D

Page 3 -- 13

Kubota Diesel Engine

8. Disconnect fuel supply hose from injection pump
(Fig. 13).
9. Remove throttle cable from engine (Figs. 13 and 14):
A. Remove lock nut that secures throttle cable swivel to speed control lever.
B. Loosen cable clamp and remove throttle cable
from under clamp.

IMPORTANT: The hydraulic pump assembly can remain in machine during engine removal. To prevent
pump from shifting or falling, make sure to support
pump assembly before mounting fasteners are removed.
14.Support hydraulic pump assembly. Remove fasteners that secure pump assembly to engine (see Pump
Assembly Removal in the Service and Repairs section
of Chapter 4 -- Hydraulic System).

C. Position throttle cable away from the engine.
10.Remove fasteners that secure the upper radiator
shroud to the lower shroud and radiator (see Radiator
Removal in this section). Position coolant reservoir and
bracket away from the radiator. Remove upper radiator
shroud from machine.

11. Remove cooling fan motor and fan assembly (Fig.
15).

8
4
5

Figure 14
1.
2.
3.
4.
5.
6.

Lock nut
Throttle cable
Cable support
Lock nut
Washer head screw
Cap screw (2 used)

12.Remove transport cylinder assembly from engine
mount (Fig. 16). It is not necessary to remove the hydraulic hose from the cylinder. Locate and remove cylinder spacer from between transport cylinder and engine
mount.

7.
8.
9.
10.
11.

Cable clamp
Spring washer (2 used)
Lock nut
Cable swivel
Cable stop

3
4

13.On Groundsmaster 4010--D machines:
A. Remove windshield washer reservoir from reservoir mount on engine (Fig. 17). Position reservoir
away from engine. Do not remove reservoir mount
from engine.
B. Remove air conditioning compressor from brackets (see Air Conditioning Compressor Removal in
the Service and Repairs section of Chapter 9 -- Operator Cab). Position compressor away from engine
taking care to not damage compressor or hoses.
Support compressor to make sure it will not fall during engine removal.
C. Disconnect coolant hose from fitting on engine
water flange.

Kubota Diesel Engine

6
7

B. Disconnect hydraulic hoses from cooling fan motor. Put caps or plugs on fittings and hoses to prevent
contamination. Label hydraulic lines for proper assembly.

D. Carefully remove fan motor, fan and motor bracket assembly from machine.

A. To prevent contamination of hydraulic system,
thoroughly clean exterior of fan motor and fittings.

C. Remove six (6) cap screws and flange nuts that
secure fan motor bracket to radiator.

Figure 15
1. Fan
2. Fan motor bracket
3. Fan motor

Page 3 -- 14

4. Cap screw (6 used)
5. Flange nut (6 used)
6. Radiator

Groundsmaster 4000--D/4010--D

15.Make sure all cable ties securing the wiring harness,
fuel lines or hydraulic hoses to the engine are removed.

RIGHT

16.Connect hoist or lift to the lift tabs on engine.

FRONT

17.Remove flange nuts, rebound washers and cap
screws securing the engine mounts to the engine supports.

12
11
1

CAUTION

One person should operate lift or hoist while
another person guides the engine out of the machine.

18.Carefully remove engine assembly from machine.
19.If necessary, remove engine mounts from the engine
using Figure 10 as a guide.

Figure 16
1.
2.
3.
4.
5.
6.
7.
8.

Carriage screw (2 used)
Cylinder spacer
Transport cylinder
Lock nut (2 used)
Piston
Backup ring (2 used)
O--ring (2 used)
Retaining ring

Engine Installation (Fig. 10)

9.
10.
11.
12.
13.
14.
15.
16.

1. Make sure that all parts removed from the engine
during maintenance or rebuilding are installed to the engine.

Seal
O--ring
Fitting
O--ring
Hydraulic hose
RH engine mount
Jam nut
Cap screw

Kubota
Diesel Engine

IMPORTANT: Make sure not to damage the engine,
fuel and hydraulic lines, electrical harness or other
components while removing the engine.

16 15

3
7

2. If removed, install engine mounts to the engine using
Figure 10 as a guide.
3. Connect hoist or lift to the engine lift tabs.
4

CAUTION

One person should operate lift or hoist while
another person guides the engine into the machine.
IMPORTANT: Make sure not to damage the engine,
fuel and hydraulic lines, electrical harness or other
parts while installing the engine.
4. Carefully lower engine into the machine.
5. Align engine to the engine supports and hydraulic
pump input shaft. Secure engine to engine supports with
cap screws, rebound washers and flange nuts.

Figure 17
1.
2.
3.
4.

Reservoir
Mount
Carriage screw (3 used)
Washer (3 used)

5. Nut (3 used)
6. Flange head screw
7. Exhaust mount

6. Secure hydraulic pump assembly to engine (see
Pump Assembly Installation in the Service and Repairs
section of Chapter 4 -- Hydraulic System).

Groundsmaster 4000--D/4010--D

Page 3 -- 15

Kubota Diesel Engine

7. Install fan motor and fan assembly (Fig. 15).
A. Carefully position fan motor, fan and motor bracket assembly to radiator.

13.Connect wires and/or electrical connections to the
following electrical components:
A. The temperature sender and alternator (Fig 11).

B. Secure fan motor bracket to radiator with six (6)
cap screws and flange nuts.

B. The glow plug (Fig. 12).
C. The engine run solenoid.

C. Remove caps and plugs placed in hoses and fittings during removal to prevent contamination.

D. Battery, frame and wire harness ground to the engine block.

D. Connect hydraulic hoses to cooling fan motor
(see Hydraulic Hose and Tube Installation in the
General Information section of Chapter 4 -- Hydraulic
System).
8. Position upper radiator shroud and coolant reservoir
with bracket to the radiator. Secure shroud and reservoir
bracket to the radiator and lower radiator bracket with
removed fasteners (see Radiator Installation in this section). Make sure that clearance between shroud and fan
is at least 0.180” (4.6 mm) at all points.
9. Connect throttle cable to injector pump (Figs. 13 and
14):
A. Secure throttle cable swivel to speed control lever with lock nut.
B. Place throttle cable under cable clamp.
C. Adjust throttle cable position in cable clamp so
that engine governor lever contacts the high speed
stop bolt at the same time that the throttle lever contacts the end of the slot in the control console.
D. Tighten cable clamp to secure throttle cable.

E. The starter and low oil pressure switch (near
starter).
F. The air conditioning compressor (Groundsmaster 4010--D machines).
14.Install air cleaner assembly to the engine (see Air Filter System Installation in this section).
15.Install exhaust system to machine (see Exhaust System Installation in this section).
16.Connect coolant hoses to the radiator. Make sure radiator drain is shut. Fill radiator and reservoir with coolant.
17.Check position of wires, fuel lines, hydraulic hoses
and cables for proper clearance with rotating, high temperature and moving components.
18.Install battery to machine (see Battery Service in the
Service and Repairs section of Chapter 5 -- Electrical
System). Make sure to connect positive battery cable
first and then negative battery cable. Secure battery to
machine with strap and cover.

10.Connect fuel line to the injection pump (Fig. 13).

19.Check and adjust engine oil as needed.

11. Install transport cylinder assembly to engine adapter
plate (Fig. 16). Make sure that cylinder spacer is positioned between transport cylinder and engine mount.

20.Check and adjust hydraulic oil as needed.

12.On Groundsmaster 4010--D machines:

22.Start engine and operate hydraulic controls to properly fill hydraulic system (see Charge Hydraulic System
in the Service and Repairs section of Chapter 4 -- Hydraulic System).

A. Position windshield washer reservoir to bracket
on engine (Fig. 17). Secure with removed fasteners.
B. Install air conditioning compressor to brackets
(see Air Conditioning Compressor Installation in the
Service and Repairs section of Chapter 9 -- Operator
Cab). Make sure that drive belt is properly tensioned.

21.Bleed fuel system.

23.Close and secure hood.

C. Connect coolant hose to fitting on engine water
flange.

Kubota Diesel Engine

Page 3 -- 16

Groundsmaster 4000--D/4010--D

Kubota
Diesel Engine

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 3 -- 17

Kubota Diesel Engine

Spring Coupler

RIGHT
FRONT

1
2

19
18
4

17
9

16
22 23

24 25

Loctite #242
29 to 33 ft--lb
(40 to 44 N--m)

Loctite #242
28 to 32 ft--lb
(38 to 43 N--m)

Figure 18
1.
2.
3.
4.
5.
6.
7.
8.
9.

Spring coupler
Washer (14 used)
Cap screw (6 used)
Flywheel plate
Cap screw (4 used)
LH engine mount
Cap screw (2 used)
Carriage screw (2 used)
Cylinder spacer

Kubota Diesel Engine

10.
11.
12.
13.
14.
15.
16.
17.

Transport cylinder
Lock nut (2 used)
Cylinder piston
O--ring (2 used)
Backup ring (2 used)
Retaining ring
Seal
O--ring

Page 3 -- 18

18.
19.
20.
21.
22.
23.
24.
25.

Hydraulic fitting
O--ring
Hydraulic hose
RH engine mount
Cap screw
Jam nut
Lock washer (2 used)
Cap screw (2 used)

Groundsmaster 4000--D/4010--D

Coupler Removal (Fig. 18)
NOTE: The hydraulic pump assembly needs to be removed from engine before coupler can be removed.

Engine Side

Hydraulic
Pump Side

1. If engine is in machine, support engine from below to
prevent it from shifting. Remove the following:

A. Remove hydraulic pump assembly from machine
(see Piston (Traction) Pump Removal in the Service
and Repairs section of Chapter 4 -- Hydraulic System).
B. Remove transport cylinder assembly from engine
mount. It is not necessary to remove the hydraulic
hose from the cylinder. Locate and remove cylinder
spacer from between transport cylinder and engine
mount.

Figure 19

Coupler Installation (Fig. 18)

1. Coupler

2. Engine flywheel

1. Position spring coupler to engine flywheel and align
mounting holes. Make sure that coupling hub is away
from engine flywheel (Fig. 19).
2. Apply Loctite #242 (or equivalent) to threads of cap
screws (item 3). Secure coupler to flywheel with six (6)
cap screws and washers. Torque cap screws in a crossing pattern from 29 to 33 ft--lb (40 to 44 N--m).
3. Apply Loctite #242 (or equivalent) to threads of cap
screws (items 5 and 7) used to secure flywheel plate to
engine. Position flywheel plate to engine and engine
mounts. Secure flywheel plate and mounts with cap
screws (items 5 and 7) and washers using a crossing
pattern tightening procedure. Torque cap screws in a
crossing pattern from 28 to 32 ft--lb (38 to 43 N--m).
4. If engine is in machine, install the following:
A. Install transport cylinder assembly to engine
mount. Make sure that cylinder spacer is placed between transport cylinder and engine mount. Check
transport cylinder adjustment (see Transport Cylinder in the Service and Repairs section of Chapter 4 -Hydraulic System).
B. Install hydraulic pump assembly to machine (see
Piston (Traction) Pump Installation in the Service
and Repairs section of Chapter 4 -- Hydraulic System).

Groundsmaster 4000--D/4010--D

Page 3 -- 19

Kubota Diesel Engine

Kubota
Diesel Engine

2. Remove flywheel plate and spring coupler from engine using Figure 18 as a guide.

This page is intentionally blank.

Kubota Diesel Engine

Page 3 -- 20

Groundsmaster 4000--D/4010--D

Chapter 4

Hydraulic System
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Check Hydraulic Fluid . . . . . . . . . . . . . . . . . . . . . . . 3
Towing Traction Unit . . . . . . . . . . . . . . . . . . . . . . . . . 3
Relieving Hydraulic System Pressure . . . . . . . . . . 4
Traction Circuit Component Failure . . . . . . . . . . . . 4
Hydraulic Hoses . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Hydraulic Hose and Tube Installation . . . . . . . . . . 6
Hydraulic Fitting Installation . . . . . . . . . . . . . . . . . . 7
HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . 9
HYDRAULIC FLOW DIAGRAMS . . . . . . . . . . . . . . . 10
Traction Circuit: Low Speed (4WD) . . . . . . . . . . . 10
Traction Circuit: Hi Speed (2WD) . . . . . . . . . . . . . 12
Lower Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . 14
Raise Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . 16
Mow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mow Circuit Cutting Deck Blade Braking . . . . . . 20
Steering Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Engine Cooling Fan Circuit . . . . . . . . . . . . . . . . . . 24
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . 30
TESTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Traction Circuit Charge Pressure . . . . . . . . . . . . . 38
Traction Circuit Relief Pressure . . . . . . . . . . . . . . 40
Counterbalance Pressure . . . . . . . . . . . . . . . . . . . 42
Traction Circuit Reducing Valve (PR) Pressure . 44
Rear Traction Circuit (RV) Relief Pressure . . . . . 46
Piston (Traction) Pump Flow . . . . . . . . . . . . . . . . . 48
Cutting Deck Circuit Pressure . . . . . . . . . . . . . . . . 50
PTO Relief Pressure . . . . . . . . . . . . . . . . . . . . . . . . 52
Cutting Deck Motor Case Drain Leakage . . . . . . 54
Cutting Deck Gear Pump Flow . . . . . . . . . . . . . . . 56
Lift/Lower Circuit Relief Pressure . . . . . . . . . . . . . 58
Steering Circuit Relief Pressure . . . . . . . . . . . . . . 60
Steering Cylinder Internal Leakage . . . . . . . . . . . 62
Steering and Lift/Lower Gear Pump Flow . . . . . . 64
Engine Cooling Fan Circuit . . . . . . . . . . . . . . . . . . 66
Engine Cooling Fan Circuit Gear Pump Flow . . 68
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Traction Linkage Adjustment . . . . . . . . . . . . . . . . . 70
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . 72
General Precautions for Removing and
Installing Hydraulic System Components . . . . 72
Check Hydraulic Lines and Hoses . . . . . . . . . . . . 72

Groundsmaster 4000--D/4010--D

Flush Hydraulic System . . . . . . . . . . . . . . . . . . . . . 73
Filtering Closed--Loop Traction Circuit . . . . . . . . 74
Charge Hydraulic System . . . . . . . . . . . . . . . . . . . 75
Hydraulic Reservoir . . . . . . . . . . . . . . . . . . . . . . . . 76
Hydraulic Oil Cooler . . . . . . . . . . . . . . . . . . . . . . . . 78
Gear Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
Gear Pump Service . . . . . . . . . . . . . . . . . . . . . . . . 82
Traction Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Transport Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . 85
Piston (Traction) Pump . . . . . . . . . . . . . . . . . . . . . 86
Piston (Traction) Pump Service . . . . . . . . . . . . . . 88
Rear Axle Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Front Wheel Motor . . . . . . . . . . . . . . . . . . . . . . . . . 92
Rear Axle and Front Wheel Motor Service . . . . . 94
4WD Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
4WD Manifold Service . . . . . . . . . . . . . . . . . . . . . . 98
Traction (Flow Divider) Manifold . . . . . . . . . . . . . 100
Traction (Flow Divider) Manifold Service . . . . . 102
Filter Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Filter Manifold Service . . . . . . . . . . . . . . . . . . . . . 106
Steering and Engine Cooling Fan Circuits . . . . 108
Steering Control Valve . . . . . . . . . . . . . . . . . . . . . 110
Steering Control Valve Service . . . . . . . . . . . . . . 112
Steering Cylinder . . . . . . . . . . . . . . . . . . . . . . . . . 114
Steering Cylinder Service . . . . . . . . . . . . . . . . . . 116
Engine Cooling Fan Motor . . . . . . . . . . . . . . . . . . 118
Engine Cooling Fan Motor Service . . . . . . . . . . 120
Fan Drive Manifold . . . . . . . . . . . . . . . . . . . . . . . . 124
Fan Drive Manifold Service . . . . . . . . . . . . . . . . . 126
PTO Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Cutting Deck Motor . . . . . . . . . . . . . . . . . . . . . . . . 129
Cutting Deck Motor Service . . . . . . . . . . . . . . . . 130
PTO Manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
PTO Manifold Service . . . . . . . . . . . . . . . . . . . . . 136
Cutting Deck Lift/Lower Circuit . . . . . . . . . . . . . . 138
Lift/Lower Manifold . . . . . . . . . . . . . . . . . . . . . . . . 140
Lift/Lower Manifold Service . . . . . . . . . . . . . . . . . 142
Side Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . . 144
Front Deck Lift Cylinder . . . . . . . . . . . . . . . . . . . . 146
Lift Cylinder Service . . . . . . . . . . . . . . . . . . . . . . . 148
EATON MODEL 72400 SERVO CONTROLLED
PISTON PUMP REPAIR INFORMATION
EATON MODEL 74318 and 74348 PISTON MOTORS:
FIXED DISPLACEMENT, VALVE PLATE DESIGN
REPAIR INFORMATION

Page 4 -- 1 Rev. A

Hydraulic System

Hydraulic
System

Table of Contents

Specifications
Item

Description

Piston (Traction) Pump

Eaton Variable Displacement Piston Pump
(Model 72400)
2.48 in3 (40.6 cc)
4000 PSI (274 bar)
5000 PSI (343 bar)
250 PSI (17 bar)

Maximum Displacement (per revolution)
System Relief Pressure: Forward
System Relief Pressure: Reverse
Charge Pressure
Front Wheel Motors

Eaton Fixed Displacement Piston Motors
(Model 74318)
2.48 in3 (40.6 cc)

Displacement (per revolution)
Rear Axle Motor

Eaton Fixed Displacement Piston Motor
(Model 74315)
2.01 in3 (32.9 cc)

Displacement (per revolution)
Gear Pump
Section P1/P2 Displacement (per revolution)
Section P3/P4 Displacement (per revolution)

Casappa 4 Section, Positive Displacement Gear pump
1.16 in3 (19.09 cc)
0.56 in3 (9.16 cc)

Steering Control Valve
Displacement (per revolution)

Eaton Steering Unit, Series 5
6.1 in3 (100 cc)

Steering Circuit Relief Pressure

1350 PSI (93 bar)

Lift/Lower Circuit Relief Pressure

1600 PSI (110 bar)

Cutting Deck Motors
Displacement (per revolution)

Sauer Danfoss Gear Motor
1.17 in3 (19.2 cc)

PTO Circuit Relief Pressure
Front and Left Side
Right Side

3000 PSI (207 bar)
2000 PSI (137 bar)

Engine Cooling Fan Motor
Displacement (per revolution)

Casappa Gear Motor
0.50 in3 (8.3 cc)

Engine Cooling Fan Circuit Relief Pressure

3000 PSI (207 bar)

Hydraulic Filters
In--line Suction Strainer

Spin--on Cartridge Type
100 Mesh (In Reservoir)

Hydraulic Reservoir

8 U.S. Gallons (30.3 Liters)

Hydraulic Oil

Hydraulic System

See Operator’s Manual

Page 4 -- 2

Groundsmaster 4000--D/4010--D

General Information
Operator’s Manual
The Operator’s Manual provides information regarding
the operation, general maintenance and maintenance
intervals for your Groundsmaster machine. Refer to that
publication for additional information when servicing the
machine.

Check Hydraulic Fluid
The Groundsmaster hydraulic system is designed to operate on anti--wear hydraulic fluid. The hydraulic reservoir located beneath the operator seat holds
approximately 8 U.S. gallons (30.3 liters) of hydraulic
fluid. Check level of hydraulic fluid daily. See Operator’s Manual for fluid level checking procedure and oil
recommendations.

Hydraulic
System

Figure 1
1. Hydraulic reservoir cap

2. Operator seat

Towing Traction Unit
IMPORTANT: If towing limits are exceeded, severe
damage to the piston (traction) pump may occur.
1

If it becomes necessary to tow (or push) the machine,
tow (or push) in a forward direction only and at a
speed below 3 mph (5 kph). The piston (traction) pump
is equipped with a by--pass valve that needs to be turned
90o (one quarter turn) for towing. Refer to your Operator’s Manual for additional towing instructions.
2

IMPORTANT: Do not turn by--pass valve when engine is running.

Figure 2
1. Bypass valve location

Groundsmaster 4000--D/4010--D

Page 4 -- 3

2. Operator seat

Hydraulic System

Relieving Hydraulic System Pressure
Before disconnecting or performing any work on the hydraulic system, all pressure in the hydraulic system
must be relieved. Park machine on a level surface, make
sure that PTO switch is OFF, lower cutting decks fully,
stop engine and engage parking brake. Wait for all moving parts to come to a complete stop.

To relieve hydraulic pressure in lift circuit, start engine
and fully lower the cutting decks. Turn key switch to OFF
and remove key from the ignition switch.
System pressure in mow circuit is relieved when the
PTO switch is disengaged.

To relieve hydraulic pressure in traction circuit, move
traction pedal to both forward and reverse directions. To
relieve hydraulic pressure in steering circuit, rotate
steering wheel in both directions.

Traction Circuit Component Failure
The traction circuit on Groundsmaster 4000--D and
4010--D machines is a closed loop system that includes
the piston (traction) pump, two (2) front wheel motors
and the rear axle motor. If a component in the traction
circuit should fail, debris and contamination from the
failed component will circulate throughout the traction
circuit. This contamination can damage other components in the circuit so it must be removed to prevent
additional component failure.
The recommended method of removing traction circuit
contamination would be to temporarily install the Toro
high flow hydraulic filter (see Special Tools in this chapter) into the circuit. This filter should be used when connecting hydraulic test gauges in order to test traction
circuit components or after replacing a failed traction circuit component (e.g. traction (piston) pump or wheel
motor). The filter will ensure that contaminates are removed from the closed loop and thus, do not cause additional component damage.

Hydraulic System

Once the Toro high flow hydraulic filter kit has been
placed in the circuit, raise and support the machine with
all wheels off the ground. Then, operate the traction circuit to allow oil flow throughout the circuit. The filter will
remove contamination from the traction circuit during
operation. Because the Toro high flow filter is bi--directional, the traction circuit can be operated in both the forward and reverse direction. The filter should be
removed from the machine after contamination has
been removed from the traction circuit. See Filtering
Closed--Loop Traction Circuit in the Service and Repairs
section of this chapter for additional information on using the Toro high flow hydraulic filter.
The alternative to using the Toro high flow hydraulic filter
kit after a traction circuit component failure would be to
disassemble, drain and thoroughly clean all components, tubes and hoses in the traction circuit. If any debris remains in the traction circuit and the machine is
operated, the debris can cause additional circuit component failure.

Page 4 -- 4

Groundsmaster 4000--D/4010--D

Hydraulic Hoses

Hard, cracked, cut, abraded, charred, leaking or
otherwise damaged hose.
Kinked, crushed, flattened or twisted hose.
Blistered, soft, degraded or loose hose cover.
Cracked, damaged or badly corroded hose fittings.
When replacing a hydraulic hose, be sure that the hose
is straight (not twisted) before tightening the fittings.
This can be done by observing the imprint (layline) on
the hose. Use two wrenches when tightening a hose;
hold the hose straight with one wrench and tighten the
hose swivel nut onto the fitting with the second wrench
(see Hydraulic Hose and Tube Installation in this section). If the hose has an elbow at one end, tighten the
swivel nut on that end before tightening the nut on the
straight end of the hose.

WARNING
Before disconnecting or performing any work on
hydraulic system, relieve all pressure in system
(see Relieving Hydraulic System Pressure in this
section).
Keep body and hands away from pin hole leaks or
nozzles that eject hydraulic fluid under high
pressure. Use paper or cardboard, not hands, to
search for leaks. Hydraulic fluid escaping under
pressure can have sufficient force to penetrate
the skin and cause serious injury. If fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.

Hydraulic
System

Hydraulic hoses are subject to extreme conditions such
as pressure differentials during operation and exposure
to weather, sun, chemicals, very warm storage conditions or mishandling during operation and maintenance.
These conditions can cause hose damage and deterioration. Some hoses are more susceptible to these
conditions than others. Inspect all machine hydraulic
hoses frequently for signs of deterioration or damage:

For additional hydraulic hose information, refer to Toro
Service Training Book, Hydraulic Hose Servicing (Part
Number 94813SL).

Groundsmaster 4000--D/4010--D

Page 4 -- 5

Hydraulic System

Hydraulic Hose and Tube Installation (O--Ring Face Seal Fitting)
1. Make sure threads and sealing surfaces of the hose/
tube and the fitting are free of burrs, nicks, scratches or
any foreign material.

C. Use a second wrench to tighten the nut to the correct Flats From Wrench Resistance (F.F.W.R.). The
markings on the nut and fitting body will verify that the
connection has been properly tightened.

2. As a preventative measure against leakage, it is recommended that the face seal O--ring be replaced any
time the connection is opened. Make sure the O--ring is
installed and properly seated in the fitting groove. Lightly
lubricate the O--ring with clean hydraulic oil.

Size
4 (1/4 in. nominal hose or tubing)
6 (3/8 in.)
8 (1/2 in.)
10 (5/8 in.)
12 (3/4 in.)
16 (1 in.)

3. Place the hose/tube against the fitting body so that
the flat face of the hose/tube sleeve fully contacts the O-ring in the fitting.

Swivel Nut

4. Thread the swivel nut onto the fitting by hand. While
holding the hose/tube with a wrench, use a torque
wrench to tighten the swivel nut to the recommended
installation torque shown in Figure 5. This tightening
process will require the use of an offset wrench (e.g.
crowfoot wrench). Use of an offset wrench will affect
torque wrench calibration due to the effective length
change of the torque wrench. Tightening torque when
using a torque wrench with an offset wrench will be lower
than the listed installation torque (see Using a Torque
Wrench with an Offset Wrench in the Torque Specifications section of Chapter 2 -- Product Records and Maintenance).

Fitting Body

O--ring

Tube or Hose

Figure 3

5. If a torque wrench is not available or if space at the
swivel nut prevents use of a torque wrench, an alternate
method of assembly is the Flats From Wrench Resistance (F.F.W.R.) method (Fig. 2).
A. Using a wrench, tighten the swivel nut onto the fitting until light wrench resistance is reached (approximately 30 in--lb).

F.F.W.R.
1/2 to 3/4
1/2 to 3/4
1/2 to 3/4
1/2 to 3/4
1/3 to 1/2
1/3 to 1/2

Mark Nut
and Fitting
Body

Final
Position

Initial
Position

Extend Line
AT WRENCH RESISTANCE

B. Mark the swivel nut and fitting body. Hold the
hose/tube with a wrench to prevent it from turning.

AFTER TIGHTENING

Figure 4

Fitting Dash Size

Hose/Tube Side Thread Size

Installation Torque

9/16 -- 18

18 to 22 ft--lb (25 to 29 N--m)

11/16 -- 16

27 to 33 ft--lb (37 to 44 N--m)

13/16 -- 16

37 to 47 ft--lb (51 to 63 N--m)

1 -- 14

60 to 74 ft--lb (82 to 100 N--m)

1 3/16 -- 12

85 to 105 ft--lb (116 to 142 N--m)

1 7/16 -- 12

110 to 136 ft--lb (150 to 184 N--m)

1 11/16 -- 12

140 to 172 ft--lb (190 to 233 N--m)
Figure 5

Hydraulic System

Page 4 -- 6

Groundsmaster 4000--D/4010--D

Hydraulic Fitting Installation (SAE Straight Thread O--Ring Fitting into Component Port)

1. Make sure all threads and sealing surfaces of fitting
and component port are free of burrs, nicks, scratches
or any foreign material.

5. If a torque wrench is not available, or if space at the
port prevents use of a torque wrench, an alternate method of assembly is the Flats From Finger Tight (F.F.F.T.)
method.

2. As a preventative measure against leakage, it is recommended that the O--ring be replaced any time the
connection is opened.
3. Lightly lubricate the O--ring with clean hydraulic oil.
Fitting threads should be clean with no lubricant applied.
IMPORTANT: Before installing fitting into port, determine port material. If fitting is to be installed into
an aluminum port, installation torque is reduced.
4. Install the fitting into the port. Then, use a torque
wrench and socket to tighten the fitting to the recommended installation torque shown in Figure 7.

A. Install the fitting into the port and tighten it down
full length until finger tight.
B. If port material is steel, tighten the fitting to the
listed F.F.F.T. If port material is aluminum, tighten fitting to 60% of listed F.F.F.T.
Size
4 (1/4 in. nominal hose or tubing)
6 (3/8 in.)
8 (1/2 in.)
10 (5/8 in.)
12 (3/4 in.)
16 (1 in.)

NOTE: Use of an offset wrench (e.g. crowfoot wrench)
will affect torque wrench calibration due to the effective
length change of the torque wrench. Tightening torque
when using a torque wrench with an offset wrench will
be less than the recommended installation torque. See
Using a Torque Wrench with an Offset Wrench in the
Torque Specifications section of Chapter 2 -- Product
Records and Maintenance to determine necessary conversion information.

F.F.F.T.
1.00 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25

Fitting

O--ring

Figure 6

Fitting
Dash Size

Fitting Port Side
Thread Size

Installation Torque Into
Steel Port

Installation Torque Into
Aluminum Port

7/16 -- 20

15 to 19 ft--lb (21 to 25 N--m)

9 to 11 ft--lb (13 to 15 N--m)

1/2 -- 20

18 to 22 ft--lb (25 to 29 N--m)

11 to 15 ft--lb (15 to 20 N--m)

9/16 -- 18

34 to 42 ft--lb (47 to 56 N--m)

20 to 26 ft--lb (28 to 35 N--m)

3/4 -- 16

58 to 72 ft--lb (79 to 97 N--m)

35 to 43 ft--lb (48 to 58 N--m)

7/8 -- 14

99 to 121 ft--lb (135 to 164 N--m)

60 to 74 ft--lb (82 to 100 N--m)

1 1/16 -- 12

134 to 164 ft--lb (182 to 222 N--m)

81 to 99 ft--lb (110 to 134 N--m)

1 3/16 -- 12

160 to 196 ft--lb (217 to 265 N--m)

96 to 118 ft--lb (131 to 160 N--m)

1 5/16 -- 12

202 to 248 ft--lb (274 to 336 N--m)

121 to 149 ft--lb (165 to 202 N--m)

1 5/8 -- 12

247 to 303 ft--lb (335 to 410 N--m)

149 to 183 ft--lb (202 to 248 N--m)

Figure 7

Groundsmaster 4000--D/4010--D

Page 4 -- 7

Hydraulic System

Hydraulic
System

Non--Adjustable Fitting (Fig. 6)

Adjustable Fitting (Fig. 8)
1. Make sure all threads and sealing surfaces of fitting
and component port are free of burrs, nicks, scratches
or any foreign material.
2. As a preventative measure against leakage, it is recommended that the O--ring be replaced any time the
connection is opened.

Lock Nut

3. Lightly lubricate the O--ring with clean hydraulic oil.
Fitting threads should be clean with no lubricant applied.

Back--up Washer

4. Turn back the lock nut as far as possible. Make sure
the back up washer is not loose and is pushed up as far
as possible (Step 1 in Figure 9).

O--ring

Figure 8

IMPORTANT: Before installing fitting into port, determine port material. If fitting is to be installed into
an aluminum port, installation torque is reduced.
5. Install the fitting into the port and tighten finger tight
until the washer contacts the face of the port (Step 2 in
Figure 9). Make sure that the fitting does not bottom in
the port during installation.
6. To put the fitting in the desired position, unscrew it by
the required amount to align fitting with incoming hose
or tube, but no more than one full turn (Step 3 in Figure
9).
7. Hold the fitting in the desired position with a wrench
and use a torque wrench to tighten the lock nut to the
recommended installation torque shown in Figure 7.
This tightening process will require the use of an offset
wrench (e.g. crowfoot wrench). Use of an offset wrench
will affect torque wrench calibration due to the effective
length change of the torque wrench. Tightening torque
when using a torque wrench with an offset wrench will
be lower than the listed installation torque (see Using a
Torque Wrench with an Offset Wrench in the Torque
Specifications section of Chapter 2 -- Product Records
and Maintenance).

Step 1

Step 3

Step 2

Step 4

Figure 9

8. If a torque wrench is not available, or if space at the
port prevents use of a torque wrench, an alternate method of assembly is the Flats From Finger Tight (F.F.F.T.)
method. Hold the fitting in the desired position with a
wrench and, if port material is steel, tighten the lock nut
with a second wrench to the listed F.F.F.T (Step 4 in Figure 9). If port material is aluminum, tighten fitting to 60%
of listed F.F.F.T.
Size
4 (1/4 in. nominal hose or tubing)
6 (3/8 in.)
8 (1/2 in.)
10 (5/8 in.)
12 (3/4 in.)
16 (1 in.)

Hydraulic System

F.F.F.T.
1.00 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25
1.50 + 0.25

Page 4 -- 8

Groundsmaster 4000--D/4010--D

Page 4 -- 9 Rev. A

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

NOTE: A larger hydraulic schematic is
included in Chapter 10: Foldout Drawings

P2
FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

S6
S5

S4
S2

.035

.070

RV2

Hydraulic
System

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Hydraulic Schematic

Hydraulic System

Page 4 -- 10 Rev. A

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Traction Circuit: Low Speed (4WD) (Forward Shown)

FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

.035

.070

RV2

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Hydraulic Flow Diagrams

Groundsmaster 4000--D/4010--D

Traction Circuit: Low Speed (4WD)

Traction circuit pressure (forward and reverse) can be
measured at test ports in hydraulic tubes. The forward
traction port is on the left side of the machine and the reverse traction port is on the right side of the machine.
The traction circuit pump and motors use a small
amount of hydraulic fluid for internal lubrication. Fluid is
designed to leak across traction pump and motor components into the case drain. This leakage results in the
loss of hydraulic fluid from the closed loop traction circuit
that must be replaced. The charge circuit is designed to
replace this traction circuit leakage.
The gear pump section that supplies oil to the steering
and lift/lower circuits also provides oil for the charge circuit. This gear pump is driven directly off the traction
pump. It provides a constant supply of charge oil to
make up for oil that is lost due to internal leakage in the
traction pump and motors.
Pump flow for the charge circuit is directed through the
oil filter and to the low pressure side of the closed loop
traction circuit. A filter bypass valve allows charge oil
flow to the closed loop if the filter becomes plugged.
Charge pressure is limited to 250 PSI (17 bar) by a relief
valve located in the oil filter manifold. Charge pressure
can be measured at the charge circuit pressure test port
on the oil filter manifold.

Forward Direction
When the Hi/Low switch is in the Low speed (4WD) position and the traction pedal is pushed in the forward direction, oil from the piston pump passes through the
traction manifold. Oil flow from traction manifold port M1
drives the front wheel motors in the forward direction
and then returns to the piston pump. Oil flow from traction manifold port M2 is routed to the P1 port of the 4WD
manifold where it is directed to the PD1 cartridge and out
of the manifold to drive the rear axle motor in the forward
direction. Oil returning from the rear motor re--enters the
4WD manifold at the M2 port. Flow passes through the
PD2 cartridge, through the CV check valve, out manifold
port P2 and back to the piston pump.
When going down a hill, the tractor becomes an over-running load that drives the wheel and axle motors. In
this condition, the rear axle motor could lock up as the
oil pumped from the motor increases pressure as it returns to the piston pump. To prevent rear wheel lock up,
an adjustable relief valve (RV) in the 4WD manifold reduces rear axle motor pressure created in down hill, dynamic braking conditions.
Reverse Direction
The traction circuit operates essentially the same in reverse Low speed (4WD) as it does in the forward direction. However, the flow through the circuit is reversed.
Oil flow from the piston pump is directed to the front
wheel motors and also to the 4WD manifold. The oil to
the front wheel motors drives them in the reverse direction and then returns to the piston pump through the
traction manifold. The oil to the 4WD manifold enters the
manifold at port P2 and flows through pressure reducing
valve (PR) which limits the down stream pressure to the
rear axle motor to 650 PSI (45 bar) so the rear wheels
will not scuff the turf during reverse operation. This reduced pressure flows through the PD2 cartridge and out
port M2 to the rear axle motor. Return oil from the rear
motor re--enters the 4WD manifold at port M1, flows
through the PD1 cartridge, exits the manifold at port P1
and returns to the piston pump.

A flow divider is incorporated into the traction circuit and
is located in the traction manifold. When in Low speed
(4WD), the operator can momentarily engage this flow
divider when low traction situations could lead to wheel
spin. Depressing the flow divider switch energizes the
solenoid valve in the traction manifold. This energized
solenoid valve causes traction pump hydraulic flow to
split between the front wheel motors (approximately
45%) and rear axle motor (approximately 55%) to reduce the chance that excessive circuit flow goes to a
spinning wheel.
Groundsmaster 4000--D/4010--D

Page 4 -- 11

Hydraulic System

Hydraulic
System

The traction circuit piston pump is a variable displacement pump that is directly coupled to the engine flywheel. Pushing the traction pedal engages a hydraulic
servo valve which controls the variable displacement
piston pump swash plate to create a flow of oil. This oil
is directed to the front wheel and rear axle motors. Operating pressure on the high pressure side of the closed
traction circuit loop is determined by the amount of load
developed at the fixed displacement wheel and axle motors. As the load increases, circuit pressure can increase to relief valve settings: 4000 PSI (274 bar) in
forward and 5000 PSI (343 bar) in reverse. If pressure
exceeds the relief setting, oil flows through the piston
pump relief valve to the low pressure side of the closed
loop traction circuit. The traction circuit provides operation in either Hi speed (2WD) or Low speed (4WD).

Hydraulic System

Page 4 -- 12

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Traction Circuit: Hi Speed (2WD) (Forward Shown)

FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

.035

.070

RV2

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

(ENERGIZED)

(EXTENDED)

(PD1 AND PD2
SHIFTED)

4WD
MANIFOLD

Traction Circuit: Hi Speed (2WD)

Traction circuit pressure (forward and reverse) can be
measured at test ports in hydraulic tubes. The forward
traction port is on the left side of the machine and the reverse traction port is on the right side of the machine.
The traction circuit pump and motors use a small
amount of hydraulic fluid for internal lubrication. Fluid is
designed to leak across traction pump and motor components into the case drain. This leakage results in the
loss of hydraulic fluid from the closed loop traction circuit
that must be replaced. The charge circuit is designed to
replace this traction circuit leakage.
The gear pump section that supplies oil to the steering
and lift/lower circuits also provides charge oil for the
traction circuit. This gear pump is driven directly off the
traction pump. It provides a constant supply of charge oil
to the traction circuit to make up for oil that is lost due to
internal leakage in the traction pump and motors.
Charge pump flow is directed through the oil filter and to
the low pressure side of the closed loop traction circuit.
A filter bypass valve allows charge oil flow to the closed
loop if the filter becomes plugged. Charge pressure is limited to 250 PSI (17 bar) by a relief valve located in the
oil filter manifold. Charge pressure can be measured at
the charge circuit pressure test port on the oil filter manifold.

Groundsmaster 4000--D/4010--D

Forward Direction
With the Hi/Low speed switch in the Hi speed position
(2WD), solenoid valve (SV) in the 4WD manifold is energized. The solenoid valve spool shifts to direct charge
pressure that shifts the PD1 and PD2 control valve
spools. The shifted PD1 valve prevents piston pump hydraulic flow from reaching the rear axle motor. With flow
blocked to the rear axle motor, all traction pump flow is
directed to the front wheel motors to allow a higher transport speed in the forward direction.
Without flow to the rear axle motor, the rotating rear
wheels drive the axle motor so it acts like a pump. Inlet
oil to the axle motor is provided by a check valve that allows charge circuit oil into the rear axle motor circuit. Oil
leaving the axle motor enters the 4WD manifold at port
M2 and is directed back to the axle motor through the
shifted PD1 cartridge and manifold port M1. To allow for
rear wheel loop cooling when in forward transport operation, a small amount of oil exits through the shifted
PD1 and PD2 cartridges that returns to the reservoir.
This oil loss is replaced by charge circuit oil.
A transport cylinder is included in the traction circuit to
reduce traction control arm movement on the piston
pump when operating in Hi speed (2WD). This reduced
arm movement limits swash plate rotation to prevent excessive transport speed.
The traction manifold flow divider cannot be engaged by
the operator during Hi speed (2WD) operation.
Reverse Direction
The traction circuit operates essentially the same in reverse Hi speed (2WD) as it does in the forward direction.
However, the flow through the circuit is reversed. The
shifted solenoid valve (SV) and directional valves PD1
and PD2 in the 4WD manifold prevent oil flow to the rear
axle motor. Oil flow from the piston pump is therefore directed to only the front wheel motors. This oil drives the
front wheel motors in the reverse direction and then returns to the piston pump. Oil circulation through the rear
axle motor loop is the same as in the Hi speed (2WD) forward direction.

Page 4 -- 13

Hydraulic System

Hydraulic
System

Hydraulic System

Page 4 -- 14

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Lower Cutting Deck (LH Deck Shown)

FAN DRIVE
MANIFOLD

RV1

S9
S7

RV2

SOLENIDS S1, S3 AND S4
ENERGIZED

LIFT/LOWER
MANIFOLD

S6
S5

S4
S2

.035

.070

BYPASS
VALVE

FILTER
MANIFOLD

RETRACTING

TRACTION
MANIFOLD

4WD
MANIFOLD

Lower Cutting Deck

A relief valve (RV1) located in the lift/lower manifold limits lift/lower circuit pressure to 1600 PSI (110 bar). An
adjustable valve (RV2) in the lift/lower manifold maintains back pressure (counterbalance) on the deck lift
cylinders to allow some of the cutting deck weight to be
transferred to the traction unit to improve traction.
Each of the cutting decks (center, right and left) can be
lowered independently with the use of three (3) switches
on the armrest console. Pressing the front of a switch
provides an input for the TEC--5001 controller to lower
a cutting deck. The controller provides electrical outputs
to solenoids in the lift/lower manifold to allow appropriate manifold valve shift to cause a deck to lower.
When the cutting decks are in a stationary position, all
solenoids in the lift/lower manifold are de--energized. In
this position, lift/lower circuit flow bypasses the lift cylinders and is directed through the lift/lower manifold, oil filter and then to the traction charge circuit.
NOTE: To lower a cutting deck, the operator must be in
the operator seat and the traction speed must be in the
Low speed (4WD) position.
Lower Center Cutting Deck
To lower the center cutting deck, the front of the center
console switch is depressed. The switch signal is an input to the TEC--5001 controller which provides an electrical output to solenoid valve S6 in the lift/lower
manifold. Energized solenoid valve S6 shifts to allow a
passage for oil flow from the rod end of the center deck
lift cylinders. The weight of the cutting deck causes the
center deck lift cylinders to extend and lower the center
cutting deck. Oil from the extending cylinders flows
through an orifice in the fitting at manifold port C2 (.070)
to control the drop speed of the cutting deck. Flow is then
directed through the shifted S6, valve RV2, out manifold
port CH, to the oil filter and is then available for the traction charge circuit.
When the center deck switch is released, solenoid S6 is
de--energized and the lift cylinders and center cutting
deck are held in position.

Groundsmaster 4000--D/4010--D

Lower Right Cutting Deck
To lower the right wing deck, the front of the right console
switch is pushed as an input to the TEC--5001 controller.
The controller provides an electrical output to solenoid
valves S1, S8 and S9 in the lift/lower manifold. The energized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the right deck lift cylinder.
Shifted S1 prevents oil flow from bypassing the lift cylinders. Shifted S8 allows an oil path to the rod end of the
right lift cylinder to retract the lift cylinder and lower the
right cutting deck. Oil from the retracting cylinder flows
through the orifice in manifold port C6 (.063) to control
the drop speed of the cutting deck. Flow is then directed
through shifted S9, valve RV2, out manifold port CH, to
the oil filter and then to the traction charge circuit.
When the deck switch is released, the manifold solenoids are de--energized and the lift cylinder and right
cutting deck are held in position.
Lower Left Cutting Deck
To lower the left wing deck, the front of the left console
switch is pushed as an input to the TEC--5001 controller.
The controller provides an electrical output to solenoid
valves S1, S3 and S4 in the lift/lower manifold. The energized solenoid valves shift to allow a passage for circuit
oil flow to the rod end of the left deck lift cylinder. Shifted
S1 prevents oil flow from bypassing the lift cylinders.
Shifted S3 allows an oil path to the rod end of the left lift
cylinder to retract the lift cylinder and lower the left cutting deck. Oil from the retracting cylinder flows through
the orifice in manifold port C4 (.063) to control the drop
speed of the cutting deck. Flow is then directed through
the shifted S4, valve RV2, out manifold port CH, to the
oil filter and then to the traction charge circuit.
When the deck switch is released, the manifold solenoids are de--energized and the lift cylinder and left cutting deck are held in position.
Cutting Deck Float
Cutting deck float allows the fully lowered cutting decks
to follow ground surface contours. Lift/lower manifold
solenoid valves S4 (left deck), S6 (center deck) and S9
(right deck) are energized when the decks are fully lowered. These energized solenoids provide an oil passage
to and from the lift cylinders to allow cylinder and cutting
deck movement while mowing. Counterbalance pressure (RV2) will affect deck float operation.
NOTE: If a deck is already fully lowered when the ignition switch is moved from OFF to RUN, the deck will not
be in float until the appropriate deck lift/lower switch is
momentarily pressed to lower.

Page 4 -- 15 Rev. A

Hydraulic System

Hydraulic
System

A four section gear pump is coupled to the piston (traction) pump. The third gear pump section supplies hydraulic flow to both the steering and lift/lower circuits.
Hydraulic flow from this pump section is delivered to the
two circuits through a proportional flow divider that is located in the fan drive manifold. This flow divider splits
pump flow approximately 50% for the steering circuit
and 50% for the lift/lower circuit.

Hydraulic System

Page 4 -- 16

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Raise Cutting Deck (LH Deck Shown)

P2
FAN DRIVE
MANIFOLD

S4
S2

RV1

S9
S7

RV2

LIFT/LOWER
MANIFOLD
SOLENIDS S1 AND S2
ENERGIZED

.035

.070

BYPASS
VALVE

EXTENDING

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Raise Cutting Deck

A relief valve (RV1) located in the lift/lower manifold limits lift/lower circuit pressure to 1600 PSI (110 bar). An
adjustable valve (RV2) in the lift/lower manifold maintains back pressure (counterbalance) on the deck lift
cylinders to allow some of the cutting deck weight to be
transferred to the traction unit to improve traction.
Each of the cutting decks (center, right and left) can be
raised independently with the use of three (3) switches
on the armrest console. Pressing the rear of a switch
provides an input for the TEC--5001 controller to raise a
cutting deck. The controller provides electrical outputs
to solenoids in the lift/lower manifold to allow appropriate valve shift to cause a deck to raise.
When the cutting decks are in a stationary position, all
solenoids in the lift/lower manifold are de--energized. In
this position, lift/lower circuit flow bypasses the lift cylinders and is directed through the lift/lower manifold, oil filter and is then available for the traction charge circuit.
NOTE: To raise a cutting deck, the operator must be in
the operator seat.
Raise Center Cutting Deck
To raise the center cutting deck, the rear of the center
console switch is depressed. The switch signal is an input to the TEC--5001 controller which provides an electrical output to solenoid valves S1 and S5 in the lift/lower
manifold. The energized solenoid valves shift to allow a
passage for circuit oil flow to the rod end of the center
deck lift cylinders. Shifted S1 prevents oil flow from bypassing the lift cylinders. Shifted S5 allows an oil path to
the rod end of the front lift cylinders causing the lift cylinders to retract and raise the center cutting deck. An orifice in manifold port C2 (.035) exists to control the raise
speed of the cutting deck. Oil from the barrel end of the
retracting cylinders returns to the hydraulic reservoir.

Raise Right Cutting Deck
To raise the right deck, the rear of the right console
switch is depressed as an input to the TEC--5001 controller. The controller provides an electrical output to solenoid valves S1 and S7 in the lift/lower manifold. The
energized solenoid valves shift to allow a passage for
circuit oil flow to the barrel end of the right deck lift cylinder. Shifted S1 prevents oil flow from bypassing the lift
cylinders. Shifted S7 allows an oil path through the orifice in manifold port C6 and to the barrel end of the right
lift cylinder to extend the lift cylinder and raise the right
cutting deck. Oil from the extending cylinder is directed
through S8 (de--energized), out manifold port CH, to the
oil filter and then to the traction charge circuit.
When the deck switch is released, the manifold solenoids are de--energized and the lift cylinder and right
cutting deck are held in position.
Raise Left Cutting Deck
To raise the left deck, the rear of the left console switch
is depressed as an input to the TEC--5001 controller.
The controller provides an electrical output to solenoid
valves S1 and S2 in the lift/lower manifold. The energized solenoid valves shift to allow a passage for circuit
oil flow to the barrel end of the left deck lift cylinder.
Shifted S1 prevents oil flow from bypassing the lift cylinders. Shifted S2 allows an oil path through the orifice in
manifold port C4 and to the barrel end of the left lift cylinder to extend the lift cylinder and raise the left cutting
deck. Oil from the extending cylinder is directed through
S3 (de--energized), out manifold port CH, to the oil filter
and then to the traction charge circuit.
When the deck switch is released, the manifold solenoids are de--energized and the lift cylinder and left cutting deck are held in position.

When the deck switch is released, the manifold solenoids are de--energized and the center deck lift cylinders and center cutting deck are held in position.

Groundsmaster 4000--D/4010--D

Page 4 -- 17 Rev. A

Hydraulic System

Hydraulic
System

Hydraulic System

Page 4 -- 18

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Mow (Front Deck Shown)

FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

S9
S7

S6
S5

S4
S2

.035

.070

RV2

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Mow

NOTE: To engage the mow circuit, the operator must
be in the operator seat, the cutting deck(s) must be fully
lowered and the traction speed must be in the Low
speed (4WD) position.
PTO Not Engaged
When the PTO switch is OFF or if the deck is raised with
the PTO switch ON, the PTO manifold solenoid valve (S)
is not energized and the solenoid spool is in the neutral
position. This solenoid spool in neutral allows a small
amount of hydraulic flow to return to tank through a manifold sensing line which causes a pressure increase that
shifts bypass cartridge LC1. The pump flow is routed
through shifted LC1 and out manifold port P2. Brake cartridge LC2 remains in the unshifted position to prevent
any return flow from the deck motor to keep the motor
from rotating.

PTO Circuit Relief
Maximum mow circuit pressure is limited for each deck
by a relief valve (RV1) in the PTO manifold. The center
and left deck relief valves are set at 3000 PSI (207 bar)
and the right deck relief valve is set at 2000 PSI (138
bar).
Relief valve (RV1) and bypass cartridge (LC1) work together as a two stage relief. When increased circuit resistance is met or if a cutting blade should strike an
object, the pressure increase is felt at the relief valve. If
the pressure should exceed the relief valve setting, the
relief valve will open, creating a small amount of hydraulic flow to return to tank through a manifold sensing line.
This flow causes a pressure increase that shifts bypass
cartridge LC1 and diverts circuit flow away from the deck
motor to manifold port P2 (Fig. 10). When circuit pressure lowers, relief valve (RV1) closes which returns bypass cartridge LC1 back to its neutral position allowing
flow to return to the deck motor.

FRONT PTO
MANIFOLD

PTO Engaged
When the PTO switch is turned ON and the decks are
lowered, the PTO manifold solenoid valve (S) is energized by the TEC--5001 controller. This shifted solenoid
valve prevents any sense line flow through the valve
which allows the bypass cartridge LC1 to be in its neutral
position. Gear pump flow entering the manifold is routed
out manifold port M1 and to the cutting deck motor. The
return flow from the deck motor re--enters manifold port
M2. The shifted solenoid valve (S) allows a small
amount of this return flow to return to tank through a
manifold sensing line which causes a pressure increase
that shifts brake cartridge LC2. Hydraulic flow is routed
through shifted LC2, out manifold port P2, through the
oil cooler and filter and then is routed to the gear pump
input. The deck motor continues to rotate as long as solenoid valve (S) is energized.
Groundsmaster 4000--D/4010--D

RETURN

Return flow from the front and right PTO manifolds is
routed through the oil cooler, oil filter and then to the gear
pump input. Return flow from the left PTO manifold provides supply for the right deck.

Page 4 -- 19

SOLENOID S ENERGIZED
DECK MOTOR STALLED
RV1 SHIFTED
LC1 SHIFTED

Figure 10

Hydraulic System

Hydraulic
System

Each cutting deck is controlled by a hydraulic manifold
equipped with a solenoid control valve (S), bypass cartridge (LC1), brake cartridge (LC2) and two (2) relief cartridges (RV1 and RV2). Circuit pressure can be
measured at port (G) of the hydraulic manifold for each
cutting deck.

Deck motor case drain leakage returns to the hydraulic
reservoir.

PUMP FLOW

A four section gear pump is coupled to the piston (traction) pump. Hydraulic flow for the mow circuit is supplied
by two sections of the gear pump. The gear pump section closest to the piston (traction) pump supplies hydraulic flow to the side cutting decks, while the next gear
pump section supplies the front cutting deck.

Mow Circuit Cutting Deck Blade Braking

RETURN
PTO
MANIFOLD

PUMP FLOW

Figure 11

RETURN

The inertia of the rotating cutting blades, however, effectively turns the deck motor into a pump causing an increase in pressure as the flow from the motor comes up
against the closed brake cartridge (LC2). When this
pressure builds to approximately 600 PSI (41 bar), relief
valve (RV2) opens which allows a small amount of hydraulic flow to return to tank through a manifold sensing
line (Fig. 12). This flow causes a pressure increase that
shifts brake cartridge (LC2) to once again allow oil flow
from the motor (Fig. 13). When return pressure drops
below 600 PSI (41 bar), relief valve (RV2) reseats and
causes LC2 to close again blocking return flow from the
deck motor to further slow the cutting blades. This action
of the brake relief valve opening and the brake cartridge
shifting occurs several times in a very short time frame
as the blades finally come to a stop. Once the blades
have stopped, brake cartridge LC2 remains in the neutral position to keep the deck motor from rotating.

PUMP FLOW

When the operator turns the PTO switch OFF or if a deck
is raised with the PTO switch ON, PTO manifold solenoid valve (S) is de--energized causing bypass cartridge
(LC1) to shift (refer to information in Mow Circuit in this
section). This shifted cartridge allows oil return out manifold port P2. At the same time, solenoid valve (S) in its
neutral position prevents any sense line flow through the
spool which causes the brake cartridge (LC2) to shift to
its neutral position blocking return flow from the deck
motor and slowing the cutting blades (Fig. 11).

PTO
MANIFOLD

RETURN

PUMP FLOW

Figure 12

PTO
MANIFOLD

Figure 13

Hydraulic System

Page 4 -- 20

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 21

Hydraulic System

Page 4 -- 22

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Steering Circuit (Left Turn Shown)

RETRACTING

FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

.035

.070

RV2

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Steering Circuit
A four section gear pump is coupled to the piston (traction) pump. The third gear pump section supplies hydraulic flow to both the steering and lift/lower circuits.
Hydraulic flow from this pump section is delivered to the
two circuits through a proportional flow divider that is located in the fan drive manifold. This flow divider splits
pump flow approximately 50% for the steering circuit
and 50% for the lift/lower circuit.

(V1) and out the L port. Pressure retracts the steering
cylinder piston for a left turn. The rotary meter ensures
that the oil flow to the cylinder is proportional to the
amount of the turning on the steering wheel. Fluid leaving the cylinder flows back through the spool valve then
through the T port and to the hydraulic reservoir.
The steering control valve returns to the neutral position
when turning is completed.

Steering circuit pressure is limited to 1350 PSI (93 bar)
by a relief valve located in the steering control valve. Circuit pressure can be measured at a test port in the hydraulic supply tube.

When a right turn is made with the engine running, the
turning of the steering wheel positions the spool valve so
that flow goes through the bottom of the spool. Flow entering the steering control valve at the P port goes
through the spool and is routed to two places. As in a left
turn, most of the flow through the valve is by--passed out
the PB port back to the oil filter and traction charge circuit. Also like a left turn, the remainder of the flow is
drawn through rotary meter (V1) but goes out port R.
Pressure extends the steering cylinder piston for a right
turn. The rotary meter ensures that the oil flow to the cylinder is proportional to the amount of the turning on the
steering wheel. Fluid leaving the cylinder flows back
through the spool valve then through the T port and to
the hydraulic reservoir.

With the steering wheel in the neutral position and the
engine running, flow enters the steering control valve at
the P port and goes through the steering control spool
valve, by--passing the rotary meter (V1) and steering
cylinder. Flow leaves the control valve through the PB
port to the oil filter and traction charge circuit.
Left Turn
When a left turn is made with the engine running, the
turning of the steering wheel positions the spool valve so
that flow goes through the top of the spool. Flow entering
the steering control valve at the P port goes through the
spool and is routed to two places. First, most of the flow
through the valve is by--passed out the PB port back to
the oil filter and traction charge circuit. Second, the remainder of the flow is drawn through the rotary meter

The steering control valve returns to the neutral position
when turning is completed.

STEERING CYLINDER

NO PISTON MOVEMENT

PISTON MOVEMENT

1350
PSI
T

1350
PSI
STEERING
CONTROL

NEUTRAL POSITION

1350
PSI
STEERING
CONTROL

LEFT TURN

STEERING
CONTROL

RIGHT TURN

Figure 14

Groundsmaster 4000--D/4010--D

Page 4 -- 23

Hydraulic System

Hydraulic
System

Right Turn

Hydraulic System

Page 4 -- 24

Rev. A

Groundsmaster 4000--D/4010--D

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Working Pressure
Low Pressure (Charge)
Return or Suction
Flow

Engine Cooling Fan Circuit (Forward Direction Shown)

FAN DRIVE
MANIFOLD

RV1

LIFT/LOWER
MANIFOLD

S9
S7

S6
S5

S4
S2

.035

.070

RV2

BYPASS
VALVE

FILTER
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

Engine Cooling Fan Circuit
A four section gear pump is coupled to the piston (traction) pump. The gear pump section farthest from the piston pump supplies hydraulic flow for the engine cooling
fan circuit (Fig. 15).
The fan drive manifold controls the operation of the hydraulic motor that drives the engine cooling fan in addition to including the flow divider for the steering and
lift/lower circuits. The fan drive manifold controls the
speed and direction of the fan motor based on electrical
output from the TEC--5002 controller.

ing oil flow to return to the fan motor but in the reverse
direction causing the motor and cooling fan to run in reverse. The controller determines the length of time that
the fan should be run in reverse before fan rotation is returned to the forward direction.

Oil flow from the gear pump to the cooling fan motor is
controlled by the proportional relief valve (PRV) in the
fan drive manifold. This valve adjusts fan circuit pressure and flow based on a PWM (Pulse Width Modulation) signal from the TEC--5002 controller. The controller
uses engine coolant and hydraulic oil temperatures as
inputs to determine the proper PWM signal for the (PRV)
valve. The fan circuit flow determines the speed of the
cooling fan motor and thus, the speed of the cooling fan.

When the engine is shut off, the over--running inertia
load of the fan blades keeps driving the fan motor and
turns it into a pump. The check valve (CV) in the fan drive
manifold will open to keep the motor circuit full of oil so
the fan motor will not cavitate.

1
Figure 15
1. Gear pump

2. Fan drive manifold

REVERSE DIRECTION SHOWN
TO RESERVOIR
TO STEERING
CIRCUIT

Forward Direction Fan Operation
Oil flow from the gear pump is sent through the de--energized fan manifold solenoid valve (S1) to rotate the cooling fan motor. Return flow from the motor re--enters the
manifold (port M2), through the de--energized solenoid
valve (S1), out of the manifold (port T) and then is routed
through the oil cooler and oil filter.

TO LIFT/LOWER
CIRCUIT

(ENERGIZED)

Reverse Direction Fan Operation (Fig. 16)
The TEC--5002 controller can reverse the cooling fan to
clean debris from the rear intake screen. If hydraulic oil
and/or engine coolant temperatures increase to an unsuitable level, a high PWM signal is sent to the (PRV)
valve to slow the cooling fan and direct pump oil flow to
the reservoir. The controller then energizes solenoid
valve (S1) in the fan drive manifold to reverse cooling fan
motor oil flow so that the motor runs in the reverse direction. A lower PWM signal is sent to the PRV valve allow-

Groundsmaster 4000--D/4010--D

Page 4 -- 25

FAN DRIVE
MANIFOLD

FROM GEAR PUMP
TO OIL COOLER

Figure 16

Hydraulic System

Hydraulic
System

If the fan motor is stalled for any reason, the manifold
proportional relief valve (PRV) has a secondary function
as a circuit relief to limit fan motor pressure to 3000 PSI
(207 bar).

Special Tools
Order special tools from your Toro Distributor.

Hydraulic Pressure Test Kit
Use to take various pressure readings for diagnostic
tests. Quick disconnect fittings provided attach directly
to mating fittings on machine test ports without tools. A
high pressure hose is provided for remote readings. Kit
contains one each: 1000 PSI (70 bar), 5000 PSI (350
bar) and 10000 PSI (700 bar) gauges. Use gauges as
recommended in the Testing section of this chapter.
Toro Part Number: TOR47009

Figure 17

15 GPM Hydraulic Tester Kit (Pressure and Flow)
Use to test hydraulic circuits and components for flow
and pressure capacities as recommended in the Testing
section of this chapter. This tester includes the following:
1. INLET HOSE: Hose connected from the system circuit to the inlet side of the hydraulic tester.
2. LOAD VALVE: A simulated working load is created
in the circuit by turning the valve to restrict flow.
3. PRESSURE GAUGE: Glycerine filled 0 to 5000 PSI
gauge to provide operating circuit pressure.
4. FLOW METER: This meter measures actual oil flow
in the operating circuit with a gauge rated from 1 to 15
GPM (5 to 55 LPM).

Figure 18

5. OUTLET HOSE: A hose from the outlet side of the
hydraulic tester connects to the hydraulic system circuit.
6. FITTINGS: An assortment of hydraulic fittings are included with this kit.
Toro Part Number: TOR214678

Hydraulic System

Page 4 -- 26

Groundsmaster 4000--D/4010--D

40 GPM Hydraulic Tester (Pressure and Flow)
Use to test hydraulic circuits and components for flow
and pressure capacities as recommended in the Testing
section of this chapter. This tester includes the following:
1. LOAD VALVE: A simulated working load is created
in the circuit by turning the valve to restrict flow.
2. PRESSURE GAUGE: Glycerine filled 0 to 5000 PSI
gauge to provide operating circuit pressure.
3. FLOW METER: This meter measures actual oil flow
in the operating circuit with a gauge rated from 4 to 40
GPM (20 to 150 LPM).
Toro Part Number: AT40002

Figure 19

NOTE: This tester does not include hoses (see Hydraulic Hose Kit TOR6007 below).

Hydraulic Hose Kit

Hydraulic
System

This kit includes fittings and hoses needed to connect 40
GPM hydraulic tester (AT40002) or high flow hydraulic
filter kit (TOR6011) to machine hydraulic traction system
components.
Toro Part Number: TOR6007

Figure 20

Groundsmaster 4000--D/4010--D

Page 4 -- 27

Hydraulic System

High Flow Hydraulic Filter Kit
The high flow hydraulic filter kit is designed with large
flow (40 GPM/150 LPM) and high pressure (5000
PSI/345 bar) capabilities. This kit provides for bi--directional filtration which prevents filtered debris from being
allowed back into the circuit regardless of flow direction.
If a component failure occurs in the closed loop traction
circuit, contamination from the failed part will remain in
the circuit until removed. When connecting hydraulic
test gauges in order to test traction circuit components
or after replacing a failed traction circuit component (e.g.
hydrostat or wheel motor), the high flow hydraulic filter
can be installed in the traction circuit. The filter will ensure that contaminates are removed from the closed
loop and thus, do not cause additional component damage.

Figure 21

Toro Part Number: TOR6011
NOTE: This kit does not include hoses (see Hydraulic
Hose Kit TOR6007 above).
NOTE: Replacement filter element is Toro part number
TOR6012. Filter element cannister tightening torque is
25 ft--lb (34 N--m).

O--Ring Kit
The O--ring kit includes O--rings in a variety of sizes for
face seal and port seal hydraulic connections. It is recommended that O--rings be replaced whenever a hydraulic connection is loosened.
Toro Part Number: 117--2727

Figure 22

Hydraulic System

Page 4 -- 28

Groundsmaster 4000--D/4010--D

Hydraulic Test Fitting Kit
This kit includes a variety of O--ring Face Seal fittings to
enable you to connect test gauges into the system.

TORO TEST FITTING KIT (TOR4079)

The kit includes: tee’s, unions, reducers, plugs, caps
and male test fittings.
Toro Part Number: TOR4079

Figure 23

Measuring Container

Hydraulic
System

Use this container for doing hydraulic motor efficiency
testing (motors with case drain lines only). Measure efficiency of a hydraulic motor by restricting the outlet flow
from the motor and measuring leakage from the case
drain line while the motor is pressurized by the hydraulic
system.
The table in Figure 25 provides gallons per minute
(GPM) conversion for measured milliliter or ounce motor
case drain leakage.
Toro Part Number: TOR4077
Figure 24

Figure 25

Groundsmaster 4000--D/4010--D

Page 4 -- 29

Hydraulic System

Troubleshooting
The charts that follow contain suggestions that can be
used to assist in diagnosing hydraulic system performance issues. The suggestions are not all--inclusive.
Also, consider that there may be more than one cause
for a machine problem.
Review the hydraulic schematic and information on hydraulic system operation in the Hydraulic Flow Diagrams section of this Chapter. This information will be
useful during the hydraulic troubleshooting process.

NOTE: When troubleshooting traction problems on
your Groundsmaster, if a problem exists in both Low
(4WD) and Hi (2WD) speeds, consider a faulty component that affects the entire traction circuit (e.g. charge
circuit, traction relief valves, piston pump, front wheel
motors). If the problem exists in Low (4WD) but not in Hi
(2WD), consider a problem in the 4WD traction system
(e.g. rear axle motor, 4WD manifold).

Refer to the Testing section of this Chapter for precautions and specific hydraulic test procedures.

General Hydraulic System Problems
Problem

Possible Cause

Hydraulic oil leaks from machine

Fitting(s), hose(s) or tube(s) is (are) loose or damaged.
O--ring(s) or seal(s) is (are) missing or damaged.

Hydraulic system operates hot.

Engine RPM is too low.

NOTE: An indication that the hydraulic system is operating at excessive temperatures would be frequent
reversing of the cooling fan and a
normal engine coolant temperature.

Brakes are applied or sticking.
Hydraulic reservoir oil level is low.
Hydraulic oil is contaminated or the wrong type.
Piston pump by--pass valve is open or damaged.
Cooling system is not operating properly.
Charge pressure is low.
Traction circuit pressure is incorrect.
Pump(s) or motor(s) are damaged.

Hydraulic oil in reservoir foams.

Hydraulic reservoir oil level is low.
Wrong type of oil is in the hydraulic system.
Air is leaking into a pump suction line.

Hydraulic System

Page 4 -- 30

Groundsmaster 4000--D/4010--D

Traction Circuit Problems
Problem

Possible Cause

Machine operates in one direction
only.

Traction control linkage is faulty.

Traction pedal is sluggish.

Traction control linkage is stuck or binding.

Traction relief valve is faulty.

Charge pressure is low.
Piston (traction) pump servo control valve orifices are plugged or
damaged.
4WD manifold PD1 and PD2 pilot directional valves seals are leaking
or damaged.
Machine travels too far before stopping when the traction pedal is released.

Traction linkage is out of adjustment.
Traction pedal does not return to neutral position.
Charge pressure is low.

Traction power is lost or machine will
not operate in either direction.

Hydraulic
System

Piston (traction) pump servo control valve orifices are plugged or
damaged.
Hydraulic reservoir oil level is low.
Piston pump by--pass valve is open or damaged.
Charge pressure is low.
Traction circuit pressure is low.
Front wheel motor couplers are damaged.
Four wheel drive will not engage.

Electrical problem exists (see Chapter 5 -- Electrical System).

NOTE: Low (4WD) will not engage
when the cutting decks are lowered.

Solenoid valve (SV) in 4WD manifold is faulty.
Cartridge valve(s) in 4WD manifold is faulty.
Drive gear on rear axle motor or driven gear for rear axle is loose or
damaged.
Rear axle motor is damaged.

Four wheel drive will not disengage.

Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (SV) in 4WD manifold is faulty.
Cartridge valve in 4WD manifold is damaged or sticking.

Groundsmaster 4000--D/4010--D

Page 4 -- 31

Hydraulic System

Mow Circuit Problems
Problem

Possible Cause

No cutting decks will operate.

Electrical problem exists (see Chapter 5 -- Electrical System).

NOTE: To engage the mow circuit,
the seat must be occupied, the cutting deck(s) must be fully lowered,
the traction speed must be in the
Low (4WD) position and the PTO
switch must be ON.

Gear pump is damaged (NOTE: other hydraulic circuits impacted as
well).

One cutting deck will not operate.

Electrical problem exists (see Chapter 5 -- Electrical System).
System pressure to the affected deck is low.
Woodruff key on affected deck motor is damaged.
Solenoid valve (S) in PTO manifold for affected deck is faulty.
Cartridge valve in PTO manifold for affected deck is damaged or
sticking.
Deck motor or gear pump section is damaged.
NOTE: If appropriate, transfer a suspected damaged motor to
another cutting deck. If problem follows the motor, motor needs
repair or replacement.

All cutting decks operate slowly.

Engine RPM is low.
Deck motor or gear pump sections are damaged.

Cutting deck stops under load.

Relief valve in PTO manifold for affected deck is by--passing.
Deck motor has internal leakage (by--passing oil).
Cutting deck gear pump section is worn or damaged.

Hydraulic System

Page 4 -- 32

Groundsmaster 4000--D/4010--D

Lift Circuit Problems
Problem

Possible Cause

Cutting decks will not raise.

Engine RPM is too low.

NOTE: Seat must be occupied in order to raise cutting decks.

Hydraulic oil level in reservoir is low.
Solenoid valve (S1) in lift/lower manifold is faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Lift arm pivots are binding.
Relief valve in lift/lower manifold is stuck.
Lift cylinder(s) is (are) damaged.
Gear pump section for lift circuit is inefficient (NOTE: steering circuit
impacted as well).

NOTE: Lift cylinders cannot provide
an absolutely perfect seal. The cutting deck will eventually lower if left
in the raised position during storage.

Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Cartridge valve(s) in lift/lower manifold has damaged seals or is
faulty.

Cutting decks will not lower.

Lift arm pivots are binding.

NOTE: To lower a cutting deck, the
seat must be occupied and the traction speed must be in the Low
(4WD) position.

Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (S1) in lift/lower manifold is faulty.
Counterbalance pressure is excessive.
Lift cylinder is damaged.

Groundsmaster 4000--D/4010--D

Page 4 -- 33

Hydraulic System

Hydraulic
System

Cutting decks raise, but will not stay
up.

Steering Circuit Problems
Problem

Possible Cause

Steering inoperative or sluggish

Steering components (e.g. tie rods, steering cylinder ends) are
worn or binding.
Steering cylinder is binding.
Oil level in hydraulic reservoir is low (NOTE: other hydraulic systems are affected as well).
Steering relief valve in steering control valve is stuck or damaged.
Steering cylinder leaks internally.
Steering control valve is worn or damaged.
Gear pump section is worn or damaged (NOTE: a worn or damaged gear pump section will also affect the lift and traction (charge)
circuits).

Engine Cooling Fan Circuit Problems
Problem

Possible Cause

Cooling fan runs only in forward direction (fan does not run in reverse
direction).

Fan control manifold solenoid cartridge valve (S1) is faulty.

Cooling fan does not rotate.

Fan motor is worn or damaged.

Electrical problem exists that prevents fan control manifold solenoid
valve (S1) operation (see Chapter 5 -- Electrical System).

Gear pump section for engine cooling fan circuit is worn or damaged.
Cooling fan always rotates at slow
speed.

Fan control manifold cartridge valve seals are leaking.
Check valve in fan control manifold is not seating.
Fan control manifold proportional relief valve (PRV) is stuck open.
Hydraulic fan motor is worn or damaged.

Cooling fan always rotates at fast
speed.

Hydraulic System

Fan control manifold proportional relief valve (PRV) is faulty.
Electrical problem exists that prevents fan control manifold proportional relief valve (PRV) operation (see Chapter 5 -- Electrical System).

Page 4 -- 34

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 35

Hydraulic System

Testing
The most effective method for isolating problems in the
hydraulic system is by using hydraulic test equipment
such as pressure gauges and flow meters in the circuits
during various operational checks (see the Special
Tools section in this Chapter).

1. Clean machine thoroughly before disconnecting or
disassembling any hydraulic components. Always keep
in mind the need for cleanliness when working on hydraulic equipment. Contamination will cause excessive
wear of components.

Before Performing Hydraulic Tests

2. Put metal caps or plugs on any hydraulic lines left
open or exposed during testing or removal of components.

IMPORTANT: All obvious areas such as oil supply,
filter, binding linkages, loose fasteners or improper
adjustments must be checked before assuming that
a hydraulic component is the source of the problem.
Precautions for Hydraulic Testing

CAUTION
Failure to use gauges with recommended pressure (PSI/bar) rating as listed in test procedures
could result in damage to the gauge and possible
personal injury from leaking hot oil.

WARNING
Keep body and hands away from pin hole leaks or
nozzles that eject hydraulic fluid under high pressure. Do not use hands to search for leaks; use
paper or cardboard. Hydraulic fluid escaping under pressure can have sufficient force to penetrate the skin and cause serious injury. If fluid is
injected into the skin, it must be surgically removed within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.

3. The engine must be in good operating condition. Use
a phototac when performing a hydraulic test. Engine
speed can affect the accuracy of the tester readings.
Check actual speed of the pump when performing flow
testing.
4. When using the hydraulic tester with flow and pressure capabilities, the inlet and the outlet hoses must be
properly connected and not reversed to prevent damage to the hydraulic tester or components.
5. When using the hydraulic tester with flow and pressure capabilities, completely open flow control valve on
tester before starting the engine to minimize the possibility of damaging components.
6. Install fittings finger tight and far enough to make
sure that they are not cross--threaded before tightening
them with a wrench.
7. Position tester hoses to prevent rotating machine
parts from contacting and damaging the hoses or tester.
8. Check oil level in the hydraulic reservoir. After connecting test equipment, make sure tank is full.
9. Check control linkages for improper adjustment,
binding or broken parts.
10.After installing test gauges, run engine at low speed
and check for any hydraulic oil leaks.

11. All hydraulic tests should be made with the hydraulic
oil at normal operating temperature.
12.Before returning machine to use, make sure that hydraulic reservoir has correct fluid level.

CAUTION
All testing should be performed by two (2)
people. One person should be in the seat to operate the machine, and the second person should
read test instruments and record test results.
Hydraulic System

Page 4 -- 36

Groundsmaster 4000--D/4010--D

Which Hydraulic Tests Are Necessary?
Before beginning any hydraulic test, identify if the problem is related to the traction circuit, cutting (mow) circuit,
lift circuit, steering circuit or engine cooling fan circuit.
Once the faulty system has been identified, perform
tests that relate to that circuit.
1. If a traction circuit problem exists, consider performing one or more of the following tests: Traction Circuit
Charge Pressure, Traction Circuit Relief Pressure,
Counterbalance Pressure, Rear Traction Circuit (RV)
Relief Pressure, Traction Circuit Reducing Valve (PR)
Pressure and/or Piston (Traction) Pump Flow Tests.

3. If a lift circuit problem exists, consider performing
one or more of the following tests: Lift/Lower Circuit Relief Pressure and/or Steering and Lift/Lower Gear Pump
Flow Tests.
4. If a steering circuit problem exists, consider performing one or more of the following tests: Steering Circuit
Relief Pressure, Steering Cylinder Internal Leakage
and/or Steering and Lift/Lower Gear Pump Flow Tests.
5. If a engine cooling fan circuit problem exists, consider performing one or more of the following tests: Engine
Cooling Fan Circuit and/or Engine Cooling Fan Circuit
Gear Pump Flow Tests.

Hydraulic
System

IMPORTANT: Refer to Traction Circuit Component
Failure in the General Information section of this
chapter for information regarding the importance of
removing contamination from the traction circuit.

2. If a cutting (mow) circuit problem exists, consider
performing one or more of the following tests: Cutting
Deck Circuit Pressure, PTO Relief Pressure, Cutting
Deck Motor Case Drain Leakage and/or Cutting Deck
Gear Pump Flow Tests.

Groundsmaster 4000--D/4010--D

Page 4 -- 37

Hydraulic System

Traction Circuit Charge Pressure (Using Pressure Gauge)

TRACTION
MANIFOLD

4WD
MANIFOLD

FROM LIFT CONTROL
MANIFOLD

FROM FRONT DECK
CYLINDERS

FILTER
MANIFOLD

PRESSURE
GAUGE

FROM STEERING VALVE PORT PB
FROM STEERING VALVE PORT T
FROM FRONT PTO MANIFOLD
TO PTO (MOW) CIRCUIT
TO PTO (MOW) CIRCUIT
TO STEERING & LIFT CIRCUITS

Hydraulic System

Page 4 -- 38

FROM PTO MANIFOLDS & FAN MOTOR

FROM PTO MANIFOLDS

TO COOLING FAN CIRCUIT

Groundsmaster 4000--D/4010--D

Procedure for Traction Circuit Charge Pressure Test
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
3. Raise and support operator seat.

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

8. Next, with the pressure gauge still connected to the
charge pressure test port, take a gauge reading while
operating the machine in forward and reverse. Start the
engine and put throttle at high idle speed (2870 RPM).
Apply the brakes and push the traction pedal forward
while monitoring the pressure gauge. Repeat for reverse direction. Stop engine and record test results.
9. If charge pressure meets specifications under no
load conditions (step 5 above), but consistently drops
more than 15% when under traction load, the piston
(traction) pump and/or traction motor(s) should be suspected of wear and inefficiency. When the pump or motors are worn or damaged, the charge pump is not able
to keep up with internal leakage in the traction system
components.
10.When testing is completed, disconnect pressure
gauge from test port. Lower and secure operator’s seat.

5. Start the engine and put throttle at high idle speed
(2870 RPM) with no load on the hydraulic system.

GAUGE READING TO BE 200 to 300 PSI (13.8 to
20.6 bar).
6. Stop engine and record test results.
7. If there is no pressure or pressure is low, check for
restriction in pump intake line. Also, inspect charge relief
valve located in filter manifold (see Filter Manifold Service in the Service and Repairs section of this chapter).
A worn or damaged gear pump (P3) could also be considered (see Steering and Lift/Lower Gear Pump Flow
Test in this section).
NOTE: If gear pump (P3) is worn or damaged, charge,
steering and lift circuits will all be affected.

Groundsmaster 4000--D/4010--D

Figure 26
1. Charge pressure port

Page 4 -- 39

2. Filter manifold

Hydraulic System

Hydraulic
System

4. Connect a 1000 PSI (70 bar) pressure gauge onto
charge pressure test port on filter manifold (Fig. 26).

Traction Circuit Relief Pressure (Using Pressure Gauge)

FORWARD TRACTION CIRCUIT RELIEF PRESSURE TEST SHOWN

4WD
MANIFOLD

FROM LIFT CONTROL
MANIFOLD

TRACTION
MANIFOLD

PRESSURE
GAUGE

FILTER
MANIFOLD

FROM FRONT DECK
CYLINDERS

FROM STEERING VALVE PORT PB
FROM STEERING VALVE PORT T
FROM FRONT PTO MANIFOLD
TO PTO (MOW) CIRCUIT
TO PTO (MOW) CIRCUIT
TO STEERING & LIFT CIRCUITS

Hydraulic System

Page 4 -- 40

FROM PTO MANIFOLDS & FAN MOTOR

FROM PTO MANIFOLDS

TO COOLING FAN CIRCUIT

Groundsmaster 4000--D/4010--D

Procedure for Traction Circuit Relief Pressure Test
2

1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.

CAUTION

Move machine to an open area, away from people
and obstructions.
2. Drive machine to an open area, lower cutting decks,
turn the engine off and apply the parking brake.

Figure 27
1. Forward traction port

CAUTION

2. Left front wheel

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
3. Connect a 10,000 PSI (700 bar) pressure gauge to
traction circuit test port for function to be checked (Fig.
27 or 28).
4. Start the engine and move throttle to high idle speed
(2870 RPM). Release parking brake. Make sure that Hi/
Low speed switch is in the Hi speed (2WD) position.

Hydraulic
System

Figure 28
1. Reverse traction port

5. Sit on seat, apply brakes fully and slowly depress the
traction pedal in the appropriate direction (forward or reverse). While pushing traction pedal, look at pressure
reading on gauge:

RIGHT
FRONT

2. Right front wheel

GAUGE READING TO BE:
Forward: 3750 to 4250 PSI (259 bar to 293 bar)
Reverse: 4750 to 5250 PSI (328 to 362 bar)
6. Release traction pedal and stop engine. Record test
results.
7. If traction pressure is too low, inspect traction pump
relief valves (Fig. 29). Clean or replace relief valves as
necessary. These cartridge type valves are factory set,
and are not adjustable. If relief valves are in good condition, traction pump or wheel motors should be suspected of wear and inefficiency.

3
1

Figure 29
1. Forward relief valve
2. Reverse relief valve

3. Traction pump

NOTE: Seal leakage across pilot directional valves
PD1 and PD2 in 4WD manifold can cause low forward
traction pressure with reverse pressure meeting specifications.
8. When testing is completed, disconnect pressure
gauge from test port.
Groundsmaster 4000--D/4010--D

Page 4 -- 41

Hydraulic System

LIFT
MANIFOLD

RV2
RV1

S9
S6

PRESSURE
GAUGE

FAN DRIVE
MANIFOLD

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Counterbalance Pressure (Using Pressure Gauge)

FROM PTO MANIFOLDS

TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 42

Rev. A

FROM RH PTO
CIRCUIT

FROM FRONT PTO MANIFOLD

FROM RH PTO
MANIFOLD

FROM DECK MOTORS

TO PTO (MOW) CIRCUIT

Groundsmaster 4000--D/4010--D

Procedure for Counterbalance Pressure Test
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.

D. Tighten lock nut to secure adjustment. Check
counterbalance pressure and readjust as needed.
9. When testing is completed, disconnect pressure
gauge from manifold test port. Install controller cover.

2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

3. Remove controller cover to gain access to lift/lower
manifold (Fig. 30).

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
RIGHT

4. Determine system charge pressure (see Traction
Circuit Charge Pressure Test in this section).

6. Start the engine and put throttle at high idle speed
(2870 RPM) with no load on the system. Do not engage
the cutting decks.

Figure 30
1. Controller cover
2. Screw (2 used)

3. Flat washer (2 used)
4. U--nut (2 used)

GAUGE READING TO BE 220 PSI (15.2 bar) over
system charge pressure (e.g. if charge pressure is
250 PSI (17.2 bar), counterbalance pressure should
be 470 PSI (32.4 bar)).

7. Stop engine and record test results.
8. Adjustment of the counterbalance valve can be performed as follows:

4
1

NOTE: Do not remove the counterbalance valve from
the hydraulic manifold for adjustment.

A. Loosen lock nut on counterbalance valve (Fig.
31).

Figure 31

B. To increase pressure setting, turn the adjustment screw on the valve in a clockwise direction. A
1/8 turn on the screw will make a measurable change
in counterbalance pressure.

1. Lift/lower manifold
2. Test port G2
3. Counterbalance valve

4. Lock nut
5. Adjusting screw

C. To decrease pressure setting, turn the adjustment screw on the valve in a counterclockwise direction. A 1/8 turn on the screw will make a measurable
change in counterbalance pressure.

Groundsmaster 4000--D/4010--D

Page 4 -- 43

Hydraulic System

Hydraulic
System

5. Connect a 1000 PSI (70 bar) pressure gauge to
counterbalance test port G2 on lift/lower manifold (Fig.
31).

FRONT

Traction Circuit Reducing Valve (PR) Pressure (Using Pressure Gauge)

FROM LIFT CONTROL
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

PRESSURE
GAUGE

FILTER
MANIFOLD

FROM FRONT DECK
CYLINDERS

FROM STEERING VALVE PORT PB
FROM STEERING VALVE PORT T
FROM FRONT PTO MANIFOLD
TO PTO (MOW) CIRCUIT
TO PTO (MOW) CIRCUIT
TO STEERING & LIFT CIRCUITS

Hydraulic System

Page 4 -- 44 Rev. A

FROM PTO MANIFOLDS & FAN MOTOR

FROM PTO MANIFOLDS

TO COOLING FAN CIRCUIT

Groundsmaster 4000--D/4010--D

Procedure for Traction Circuit Reducing Valve (PR)
Pressure Test

1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

CAUTION

Figure 32
1. 4WD manifold

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

2. Pressure test port

3. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD manifold under radiator (Fig. 32).
4. Start the engine and put throttle at high idle speed
(2870 RPM). Make sure that Hi/Low speed switch is in
the Low speed (4WD) position.

Figure 33
1. 4WD manifold (front)

2. Reducing valve (PR)

GAUGE READING TO BE approximately 650 PSI
(45 bar).
6. Stop engine and record test results.
7. Pressure reducing valve (PR) is located on the front
side of the 4WD manifold (Fig. 33). Adjustment of this
valve can be performed as follows:

NOTE: Do not remove the pressure reducing valve
from the hydraulic manifold for adjustment.
A. To increase pressure setting, remove cap on reducing valve and turn the adjustment socket on the
valve in a clockwise direction. A 1/8 turn on the socket will make a measurable change in pressure setting.

B. To decrease pressure setting, remove cap on reducing valve and turn the adjustment socket on the
valve in a counterclockwise direction. A 1/8 turn on
the socket will make a measurable change in pressure setting.
C. Recheck reducing valve (PR) pressure setting
and readjust as needed.

Figure 34
1.

Relief valve cap

Adjustment socket

8. When testing is completed, disconnect pressure
gauge from manifold test port.
Groundsmaster 4000--D/4010--D

Page 4 -- 45 Rev. A

Hydraulic System

Hydraulic
System

5. Sit on seat, apply brakes fully and slowly depress the
traction pedal in the reverse direction. While pushing
traction pedal, look at pressure reading on gauge:

Rear Traction Circuit (RV) Relief Pressure (Using Pressure Gauge)

FROM LIFT CONTROL
MANIFOLD

TRACTION
MANIFOLD

4WD
MANIFOLD

PRESSURE
GAUGE

FILTER
MANIFOLD

FROM FRONT DECK
CYLINDERS

FROM STEERING VALVE PORT PB
FROM STEERING VALVE PORT T
FROM FRONT PTO MANIFOLD
TO PTO (MOW) CIRCUIT
TO PTO (MOW) CIRCUIT
TO STEERING & LIFT CIRCUITS

Hydraulic System

Page 4 -- 46 Rev. A

FROM PTO MANIFOLDS & FAN MOTOR

FROM PTO MANIFOLDS

TO COOLING FAN CIRCUIT

Groundsmaster 4000--D/4010--D

Procedure for Rear Traction Circuit (RV) Relief Pressure Test

B. To increase relief pressure setting, rotate adjustment socket in a clockwise direction.

1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.

C. To decrease pressure setting, rotate adjustment
socket in a counterclockwise direction.

2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

10.When testing is completed, disconnect pressure
gauge from manifold test port.

D. Recheck relief pressure and readjust as needed.

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
1
3. Measure and record traction circuit pressure reducing valve (PR) pressure (see Traction Circuit Pressure
Reducing Valve (PR) Pressure Test in this section).

Figure 35
1. 4WD manifold (front)

2. Relief valve (RV)

Hydraulic
System

4. Connect a 1000 PSI (70 bar) pressure gauge to test
port on 4WD manifold under radiator. This is the same
pressure gauge position as used to measure traction circuit pressure reducing valve (PR) pressure.
5. Start the engine and put throttle at high idle speed
(2870 RPM). Make sure that Hi/Low switch is in the Low
(4WD) position.

6. Operate the machine in Low speed (4WD) with the
cutting decks lowered. Drive down a slope in a forward
direction, decrease pressure on the traction pedal and
monitor the pressure gauge. Pressure should increase
until the relief valve lifts.
7. Stop engine and record test results.

8. Relief (RV) pressure should be approximately 750
PSI (52 bar) and at least 100 PSI (7 bar) higher than
the traction circuit pressure reducing valve (PR)
pressure (e.g. if the pressure reducing valve (PR) pressure is 650 PSI (45 bar), relief (RV) pressure should be
at least 750 (52 bar) but not much higher).
9. Relief valve (RV) is located on the front side of the
4WD manifold (Fig. 35). Adjustment of the relief valve
(RV) can be performed as follows:

Figure 36
1.

Relief valve cap

Adjustment socket

NOTE: Do not remove the relief valve from the hydraulic manifold for adjustment.
A. Remove cap on relief valve to locate the adjustment socket (Fig. 36). A 1/8 turn on the socket will
make a measurable change in relief pressure.

Groundsmaster 4000--D/4010--D

Page 4 -- 47 Rev. A

Hydraulic System

Piston (Traction) Pump Flow Test (Using Tester with Flow meter and Pressure Gauge)

TRACTION
MANIFOLD

4WD
MANIFOLD

FROM LIFT CONTROL
MANIFOLD

TESTER

FILTER
MANIFOLD

FROM FRONT DECK
CYLINDERS

FROM STEERING VALVE PORT PB
FROM STEERING VALVE PORT T
FROM FRONT PTO MANIFOLD
TO PTO (MOW) CIRCUIT
TO PTO (MOW) CIRCUIT
TO STEERING & LIFT CIRCUITS

Hydraulic System

Page 4 -- 48

FROM PTO MANIFOLDS & FAN MOTOR

FROM PTO MANIFOLDS

TO COOLING FAN CIRCUIT

Groundsmaster 4000--D/4010--D

This test measures piston (traction) pump output (flow).
During this test, pump load is created at the flow meter
using the adjustable load valve on the tester.
IMPORTANT: Traction circuit flow for the
Groundsmaster 4000/4010 is approximately 30 GPM
(113.5 LPM). Use 40 GPM Hydraulic Tester #AT40002
(pressure and flow) for this test (see Special Tools
in this chapter).
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks raised and off. Latch wing decks in raised position. Make sure that the Hi/Low switch is in the Low
speed (4WD) position. Shut off engine.

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
3. Make sure that traction pedal is adjusted to the neutral position. Also, ensure that traction pump is at full
stroke when traction pedal is pushed into fully forward
position.
4. Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 -- Safety).
5. Thoroughly clean junction of hydraulic hose and left
side fitting on bottom of traction pump (forward port)
(Fig. 37). Disconnect hose from left side pump fitting.

7. Start engine and run at idle speed. Check for any hydraulic leakage from tester and hose connections. Correct any leaks before proceeding.
8. Move throttle so engine is running at high idle speed
(2870 RPM).
9. Slowly push traction pedal to fully forward position.
Keep pedal fully depressed in the forward position.
10.Have second person watch pressure gauge on tester carefully while slowly closing the flow control valve
until 1000 PSI (69 bar) is obtained. Verify with a phototac that the engine speed is still 2870 RPM.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
11. Observe flow gauge. Flow indication should be
approximately 29 GPM (110 LPM).
12.Release traction pedal to the neutral position, open
flow control valve on tester and shut off engine. Record
test results.
13.If flow is less than 26 GPM (98 LPM), consider the
following:
A. The traction pump swash plate is not being rotated fully (e.g. Hi/Low switch is not in Low speed
(4WD), traction pedal linkage may need adjustment).
B. The hydrostat needs to be repaired or replaced
as necessary.
14.Make necessary repairs before performing any additional tests.
15.When testing is complete, disconnect tester and
hose kit from pump fitting and machine hydraulic hose.
Reconnect hose to pump fitting. Lower machine to
ground.

6. Install tester with pressure gauge and flow meter in
series between traction pump fitting and disconnected
hose to allow flow from traction pump to tester. Use hydraulic hose kit (see Special Tools in this chapter) to connect tester to machine. Make sure that fitting and hose
connections are properly tightened. Also, make sure the
flow control valve on tester is fully open.

RIGHT
FRONT

CAUTION
All wheels will be off the ground and rotating during this test. Make sure machine is supported so
it will not move and accidentally fall to prevent injuring anyone near the machine.

2
Figure 37
1.

Groundsmaster 4000--D/4010--D

Page 4 -- 49

Piston (traction) pump

2. LH fitting (forward port)

Hydraulic System

Hydraulic
System

Procedure for Piston (Traction) Pump Flow Test

Hydraulic System

Page 4 -- 50

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

FROM COOLING
FAN CIRCUIT

TO STEERING & LIFT CIRCUITS
TO COOLING FAN CIRCUIT

FILTER
MANIFOLD

FRONT DECK CIRCUIT PRESSURE TEST SHOWN
FROM REAR AXLE MOTOR

CHARGE CIRCUIT

FROM FRONT WHEEL MOTORS

FROM 4WD MANIFOLD

TRACTION CIRCUIT FLOW

Cutting Deck Circuit Pressure (Using Pressure Gauge)

TRACTION CIRCUIT FLOW

PRESSURE
GAUGE

Groundsmaster 4000--D/4010--D

Procedure for Cutting Deck Circuit Pressure Test
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

CAUTION
Figure 38
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

1. Front deck circuit pressure test port

3. Install 5000 PSI (350 bar) pressure gauge with hydraulic hose attached to manifold test port for the deck
to be tested (Figs. 38, 39 and 40).

CAUTION
Cutting deck blades will rotate when lowered
with PTO switch in ON position. Keep away from
cutting decks during test to prevent personal injury from rotating blades. Do not stand in front of
the machine.

Hydraulic
System

Figure 39
1. Right deck circuit pressure test port

4. Start engine and move throttle to high idle speed
(2870 RPM). Engage the cutting decks.
5. Watch pressure gauge carefully while mowing with
the machine.
6. Cutting deck circuit pressure should be as follows
and will vary depending on mowing conditions:
LH Deck: 1000 to 3000 PSI (69 to 207 bar)
Front Deck: 1000 to 3000 PSI (69 to 207 bar)
RH Deck: 1000 to 2000 PSI (69 to 137 bar)

7. Disengage cutting decks. Shut off engine and record
test results.

Figure 40
1. Left deck circuit pressure test port

8. When testing is completed, disconnect pressure
gauge with hose from manifold test port.

Groundsmaster 4000--D/4010--D

Page 4 -- 51

Hydraulic System

TESTER

Hydraulic System

Page 4 -- 52
FROM COOLING
FAN CIRCUIT

TO STEERING & LIFT CIRCUITS
TO COOLING FAN CIRCUIT

FILTER
MANIFOLD

FROM REAR AXLE MOTOR

CHARGE CIRCUIT

FROM 4WD MANIFOLD
FROM FRONT WHEEL MOTORS

TRACTION CIRCUIT FLOW

FRONT PTO RELIEF PRESSURE TEST SHOWN

RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

PTO Relief Pressure (Using Tester with Pressure Gauge and Flow Meter)

TRACTION CIRCUIT FLOW

Groundsmaster 4000--D/4010--D

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
3. Locate deck manifold to be tested (Fig. 41). Disconnect hydraulic hose at deck manifold port (M1).
NOTE: An alternative to using manifold port (M1) would
be to disconnect the inlet hydraulic hose to the deck motor.

8. Fully open tester flow control valve and disengage
cutting decks. Shut off engine and record test results. If
specification is not met, adjust or clean relief valve in
deck manifold port (RV1). Adjust relief valve as follows:
NOTE: Do not remove relief valve from the hydraulic
manifold for adjustment.
A. Remove cap on relief valve with an allen wrench.
B. To increase pressure setting, turn the adjustment screw on the valve in a clockwise direction. A
1/8 turn on the screw will make a measurable change
in relief pressure.
C. To decrease pressure setting, turn the adjustment screw on the valve in a counterclockwise direction. A 1/8 turn on the screw will make a measurable
change in relief pressure.
D. Reinstall and tighten cap to secure adjustment.
Recheck relief pressure and readjust as needed.
9. Disconnect tester from manifold and hose. Reconnect hydraulic hose that was disconnected for test procedure.

4. Install tester (flow and pressure) in series with the
disconnected hose and hydraulic manifold port (M1) (or
motor inlet if hose was disconnected at deck motor).
Make sure the flow control valve on tester is fully open.

RIGHT
FRONT

Hydraulic
System

Procedure for PTO Relief Pressure Test

CAUTION

Cutting deck blades will rotate when lowered
with PTO switch in ON position. Keep away from
cutting decks during test to prevent personal injury from rotating blades. Do not stand in front of
the machine.
5. Start engine and move throttle to high idle speed
(2870 RPM). Engage the cutting decks.
6. Watch pressure gauge carefully while slowly closing
the tester flow control valve to fully closed.

1. Front PTO manifold
2. LH PTO manifold

Figure 41

3. RH PTO manifold

FRONT PTO MANIFOLD SHOWN

7. As the relief valve lifts, system pressure should be
approximately:

2900 to 3100 PSI (200 to 213 bar) for the front and
left decks
1900 to 2100 PSI (131 to 144 bar) for the right deck

Figure 42

1. PTO manifold
2. PTO relief valve (RV1)

Groundsmaster 4000--D/4010--D

Page 4 -- 53

3. Relief valve cap

Hydraulic System

FROM REAR AXLE MOTOR

CHARGE CIRCUIT

FROM 4WD MANIFOLD

FROM COOLING
FAN CIRCUIT
RH PTO
MANIFOLD

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

TO STEERING & LIFT CIRCUITS
TO COOLING FAN CIRCUIT

FILTER
MANIFOLD

TRACTION CIRCUIT FLOW

FROM FRONT WHEEL MOTORS

FRONT CUTTING DECK MOTOR
CASE DRAIN LEAKAGE TEST SHOWN

TRACTION CIRCUIT FLOW

Cutting Deck Motor Case Drain Leakage (Using Tester with Pressure Gauge and Flow
Meter)

TESTER

CAP

MEASURING
CONTAINER

Hydraulic System

Page 4 -- 54

Groundsmaster 4000--D/4010--D

Procedure for Cutting Deck Motor Case Drain
Leakage Test

5. Sit on seat and start the engine. Move throttle to high
idle speed (2870 RPM). Move PTO switch to ON.

NOTE: Over a period of time, a deck motor can wear internally. A worn motor may by--pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the deck motor to stall under
heavy cutting conditions. Continued operation with a
worn, inefficient motor can generate excessive heat,
cause damage to seals and other components in the hydraulic system and affect quality of cut.

6. While watching pressure gauge, slowly close flow
control valve on tester until a pressure of 1200 PSI (83
bar) is obtained.

7. Have a second person collect the flow from the case
drain line for 15 seconds, then move the PTO switch to
OFF and stop the engine (Fig. 44). Record test results.
TEST RESULTS: Flow less than 22.4 ounces (662
ml) (0.7 GPM/2.6 LPM) of hydraulic fluid in 15 seconds.
8. If flow is more than 22.4 ounces (662 ml) (0.7
GPM/2.6 LPM) in 15 seconds, the motor is worn or damaged and should be repaired or replaced.
9. After testing is completed, disconnect tester from
motor and hose. Reconnect hose to the deck motor. Remove cap from tee--fitting and reconnect case drain
hose.

CAUTION

Hydraulic
System

NOTE: One method to find a failing or malfunctioning
deck motor is to have another person observe the machine while mowing in dense turf. A bad motor will run
slower, produce fewer clippings and may cause a different appearance on the turf.

NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 44).

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
2

NOTE: The side deck motors are connected in series.
To isolate a faulty motor, both motors in the circuit may
have to be tested by starting with the left side motor first.
3. Disconnect hose from return of the motor to be
tested (Fig. 43). Install tester (flow and pressure) in series with the motor and disconnected return hose. Make
sure the flow control valve on tester is fully open.

1
Figure 43
1. Deck motor (RH shown)
2. Return hose

3. Case drain hose

4. Disconnect the motor case drain hose (small diameter hose) where it connects to hydraulic manifold tee--fitting (not at the motor). Put a steel cap on the fitting at the
tee--fitting; leave the case drain hose open.

Groundsmaster 4000--D/4010--D

Page 4 -- 55

Figure 44

Hydraulic System

Page 4 -- 56
FROM COOLING
FAN CIRCUIT

FILTER
MANIFOLD

FROM REAR AXLE MOTOR

CHARGE CIRCUIT

FROM 4WD MANIFOLD
FROM FRONT WHEEL MOTORS

TRACTION CIRCUIT FLOW

FRONT DECK GEAR PUMP FLOW TEST SHOWN

RH PTO
MANIFOLD

TO STEERING & LIFT CIRCUITS
TO COOLING FAN CIRCUIT

TESTER

LH PTO
MANIFOLD

FRONT PTO
MANIFOLD

Cutting Deck Gear Pump Flow (Using Tester with Pressure Gauge and Flow Meter)

TRACTION CIRCUIT FLOW

Groundsmaster 4000--D/4010--D

NOTE: Over a period of time, the gears and wear plates
in the pump can wear. A worn pump will by pass oil and
make the pump less efficient. Eventually, enough oil loss
will occur to cause the cutting deck motors to stall under
heavy cutting conditions. Continued operation with a
worn, inefficient pump can generate excessive heat and
cause damage to the seals and other components in the
hydraulic system.
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

CAUTION

7. Watch pressure gauge carefully while slowly closing
the flow control valve until 2000 PSI (138 bar) is obtained. Verify with a phototac that the engine speed is
still 2870 RPM.
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
8. Flow indication should be approximately 14 GPM (53
LPM).
9. Shut off engine and record test results.
10.If a pressure of 2000 PSI (138 bar) cannot be obtained or flow was less than 12 GPM (45 LPM), check
for restriction in the pump intake line. If line is not restricted, consider that gear pump section for cutting
deck circuit is worn or damaged.
11. After testing is completed, disconnect flow tester
from hydraulic hose and manifold port. Reconnect hose
to the manifold.

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

RIGHT
FRONT

3. Locate deck manifold for gear pump section to be
tested. Disconnect hydraulic hose from fitting in deck
manifold port (P1) (Fig. 45).

4. Install tester (flow and pressure) in series with the
disconnected hose and hydraulic fitting in manifold port
(P1).
2

5. Make sure the flow control valve on tester is fully
open.
6. Start engine and move throttle to high idle speed
(2870 RPM). Do not engage the cutting decks.

Figure 45
1. Front PTO manifold
2. Hyd. hose to front P1

3. LH PTO manifold
4. Hyd. hose to LH P1

IMPORTANT: Do not fully restrict oil flow through
tester. In this test, the flow tester is positioned before the relief valve. Pump damage can occur if the
oil flow is fully restricted.

Groundsmaster 4000--D/4010--D

Page 4 -- 57

Hydraulic System

Hydraulic
System

Procedure for Cutting Deck Gear Pump Flow Test

RV2

FAN DRIVE
MANIFOLD

PRESSURE
GAUGE

LIFT
MANIFOLD

S1
S3

RV1

S5
S2

S6
S4

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Lift/Lower Circuit Relief Pressure (Using Pressure Gauge)

FROM PTO MANIFOLDS

TO PTO (MOW) CIRCUIT
FROM DECK MOTORS

TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 58

Rev. A

FROM RH PTO
CIRCUIT

FROM RH PTO
MANIFOLD

FROM FRONT PTO MANIFOLD

Groundsmaster 4000--D/4010--D

Procedure for Lift/Lower Circuit Relief Pressure
Test
NOTE: Before attempting to check or adjust lift/lower
circuit relief pressure, make sure that counterbalance
pressure is correctly adjusted (see Counterbalance
Pressure Test in this section).
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

B. To decrease pressure setting, remove cap on relief valve and turn the adjustment socket on the valve
in a counterclockwise direction. A 1/8 turn on the
socket will make a measurable change in pressure
setting.
C. After relief valve adjustment, recheck pressure
setting and readjust as needed.
9. If relief valve adjustment does not change relief pressure, check for restriction in pump intake line, lift cylinder(s) internal leakage or gear pump damage.
10.When testing is completed, disconnect pressure
gauge from test port. Install controller cover.

3. Remove controller cover to gain access to lift/lower
manifold (Fig. 46).

CAUTION

Hydraulic
System

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
4. Connect a 5,000 PSI (345 bar) pressure gauge to
test port G1 on lift/lower manifold (Fig. 47).
5. Sit on the seat and start the engine. Move throttle to
high idle speed (2870 RPM).
6. While sitting on the seat, depress the rear of one of
the lift switches to fully raise the cutting deck. Momentarily hold the switch with the deck fully raised while looking at the gauge.

RIGHT
FRONT
Figure 46
1. Controller cover
2. Screw (2 used)

3. Flat washer (2 used)
4. U--nut (2 used)

GAUGE READING TO BE approximately 1600 PSI
(110 bar).
7. Release the lift switch, stop the engine and record
test results.

8. Relief valve (RV1) is located on the top side of the lift/
lower manifold (Fig. 47). Adjustment of this valve can be
performed as follows:
NOTE: Do not remove the relief valve from the hydraulic manifold for adjustment.

2
3

A. To increase pressure setting, remove cap on relief valve and turn the adjustment socket on the valve
in a clockwise direction. A 1/8 turn on the socket will
make a measurable change in pressure setting.

Figure 47
1. Lift/lower manifold
2. Test port G1

Groundsmaster 4000--D/4010--D

Page 4 -- 59

3. Relief valve RV1

Hydraulic System

RV2

FAN DRIVE
MANIFOLD

LIFT
MANIFOLD

RV1

PRESSURE
GAUGE

S5
S2

S6
S4

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Steering Circuit Relief Pressure (Using Pressure Gauge)

FROM PTO MANIFOLDS

TO PTO (MOW) CIRCUIT
FROM DECK MOTORS
TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 60

Rev. A

FROM RH PTO
CIRCUIT

FROM RH PTO
MANIFOLD

FROM FRONT PTO MANIFOLD

Groundsmaster 4000--D/4010--D

Procedure for Steering Circuit Relief Pressure Test
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

7. If pressure is incorrect, inspect steering relief valve
in steering control valve (see Steering Control Valve in
the Service and Repairs section of this chapter). If relief
valve is operating properly and if lift/lower problems also
exist, flow divider in fan manifold and/or gear pump
(third section) should be suspected of wear and inefficiency. If steering wheel continues to turn at end of cylinder travel (with lower than normal effort), steering
cylinder or steering control valve should be suspected
of wear or damage.
8. When testing is completed, disconnect pressure
gauge from test port.

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

3. Locate steering circuit pressure test port and connect a 5000 PSI (350 bar) pressure gauge onto test port.

B. On Groundsmaster 4010--D machines, the test
port is located on the steering supply hydraulic tube
under the operator seat (Fig. 49).

Figure 48
1. Steering circuit pressure test port (GM4000--D)

4. Start the engine and move throttle to high idle engine
speed (2870 RPM).
IMPORTANT: Hold steering wheel at full lock only
long enough to get a system relief pressure reading.
Holding the steering wheel against the stop for an
extended period can damage the steering control
valve.

5. Turn steering all the way in one direction and momentarily hold the steering wheel against resistance.
GAUGE READING TO BE 1300 to 1400 PSI (90 to
96 bar).
Figure 49

6. Stop the engine and record test results.

Groundsmaster 4000--D/4010--D

1. Steering circuit pressure test port (GM4010--D)

Page 4 -- 61

Hydraulic System

Hydraulic
System

A. On Groundsmaster 4000--D machines, the test
port is located on the steering supply hydraulic tube
under the front of the machine (Fig. 48).

Steering Cylinder Internal Leakage

STEERING CYLINDER

CYLINDER FULLY
EXTENDED

LOOK FOR
LEAKAGE

STEEL CAP

STEERING WHEEL
TURNED FOR
RIGHT TURN

1350
PSI
T

Hydraulic System

STEERING CONTROL

Page 4 -- 62

Groundsmaster 4000--D/4010--D

Procedure for Steering Cylinder Internal Leakage
Test
NOTE: Steering circuit operation will be affected by
rear tire pressure, binding of steering cylinder, extra
weight on the vehicle and/or binding of rear axle steering
components. Make sure that these items are checked
before proceeding with steering cylinder internal leakage test.
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.

5. Place a drain pan under the steering cylinder. Remove hydraulic hose from the fitting on the rod end of the
steering cylinder. Install a steel plug in the disconnected
hose.
6. Remove all hydraulic oil from drain pan. Make sure
that empty drain pan remains under the open fitting of
the steering cylinder.
7. With the engine off, turn the steering wheel for a right
turn. Observe the open fitting on the extended steering
cylinder as the steering wheel is turned. If oil comes out
of the fitting while turning the steering wheel, the steering cylinder has internal leakage and must be repaired
(see Steering Cylinder and Steering Cylinder Service in
the Service and Repairs section of this chapter). Check
drain pan for any evidence of oil that would indicate cylinder leakage.

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
3. Turn the steering wheel for a right turn so that the
steering cylinder rod is fully extended.

9. If a steering problem exists and the steering cylinder
tested acceptably, the steering control valve requires
service (see Steering Control Valve and Steering Control Valve Service in the Service and Repairs section of
this chapter).
10.Check oil level in hydraulic reservoir and adjust if
needed.

4. Thoroughly clean the area around the hydraulic hose
at the rod end of the steering cylinder.

Groundsmaster 4000--D/4010--D

Page 4 -- 63

Hydraulic System

Hydraulic
System

8. After testing is completed, remove plug from the hydraulic hose. Connect hose to the steering cylinder fitting.

RV2
S1

TESTER

FAN DRIVE
MANIFOLD

LIFT
MANIFOLD

RV1

S5
S2

S6
S4

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Steering and Lift/Lower Gear Pump Flow (Using Tester with Pressure Gauge and Flow
Meter)

FROM PTO MANIFOLDS

TO PTO (MOW) CIRCUIT
FROM DECK MOTORS

TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 64

Rev. A

FROM RH PTO
CIRCUIT

FROM RH PTO
MANIFOLD

FROM FRONT PTO MANIFOLD

Groundsmaster 4000--D/4010--D

Procedure for Steering and Lift/Lower Gear Pump
Flow Test

5. Start the engine and move throttle to high idle speed
(2870 RPM). DO NOT engage the cutting decks.

NOTE: Output from the steering and lift/lower gear
pump section is equally divided by a proportional valve
to provide flow to the steering circuit and the lift circuit.
The proportional valve is in the fan drive manifold.

6. While watching pressure gauge on tester, slowly
close flow control valve until 1000 PSI (69 bar) is obtained on gauge. Verify that engine speed continues to
be 2870 RPM.

NOTE: While rotating the steering wheel and raising
the decks at the same time with the engine running at
high idle speed (2870 RPM), an indication of gear pump
damage may be the steering wheel getting hard to turn
and/or the cutting decks raising very slowly.

GAUGE READING TO BE: Flow approximately 7
GPM (26 LPM) at 1000 PSI (69 bar).

NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
7. Open flow tester control valve, stop engine and record test results.
8. If a pressure of 1000 PSI (69 bar) could not be obtained or flow is lower than 6 GPM (23 LPM), check for
restriction in pump intake line. If intake line is not restricted, consider that gear pump section for steering
and lift/lower circuits is worn or damaged.
9. When testing is complete, remove tester and reconnect hose to pump fitting.
2

Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

3. With the engine off and cutting decks lowered, disconnect the hydraulic hose from the 90o fitting in the
third gear pump section which supplies the steering and
lift/lower circuits (Fig. 50).
IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump section, through the tester and
into the hydraulic hose.
4. Install tester (flow and pressure) in series between
the fitting and the disconnected hose. Make sure the
flow control valve on tester is fully open.

1
Figure 50
1. Gear pump
2. Fan drive manifold

3. Steering/lift supply hose
4. 90o fitting

IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other components could occur.

Groundsmaster 4000--D/4010--D

Page 4 -- 65

Hydraulic System

Hydraulic
System

CAUTION

RV2

FAN DRIVE
MANIFOLD

LIFT
MANIFOLD

RV1

S5
S2

S6
S4

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Engine Cooling Fan Circuit (Using Pressure Gauge and Phototac)

FROM PTO MANIFOLDS

PRESSURE
GAUGE

TO PTO (MOW) CIRCUIT
FROM DECK MOTORS
TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 66

Rev. A

FROM RH PTO
CIRCUIT

FROM RH PTO
MANIFOLD

FROM FRONT PTO MANIFOLD

Groundsmaster 4000--D/4010--D

Procedure for Engine Cooling Fan Circuit Test
1. Make sure hydraulic oil is at normal operating temperature by operating the machine under load for
approximately ten (10) minutes. Make sure the hydraulic tank is full.

2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied. Raise and support hood.
1

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.
3. Raise seat to gain access to the fan drive manifold
(Fig. 51). Connect a 5,000 PSI (345 bar) pressure gauge
with hydraulic hose attached to test port on top of manifold.

Figure 51
1. Fan drive manifold

2. Test port G1

5. While monitoring the pressure gauge and using a
phototac to identify the cooling fan speed, disconnect
the wire harness connector (white/green and black
wires) from the PRV solenoid on fan drive manifold (Fig.
52). Both fan speed and pressure should increase and
stabilize after the solenoid is disconnected.

Hydraulic
System

4. Start the engine. Move throttle to high idle speed
(2870 RPM).
1

PRESSURE GAUGE READING TO BE approximately 3000 PSI (207 bar).
PHOTOTAC READING TO BE: fan speed should be
at least 2800 RPM.

Figure 52
1. Fan drive manifold

2. PRV solenoid

6. Stop engine and record test results.
7. If pressure rises to approximately 3000 PSI (207
bar) but fan speed is low, consider that the fan motor is
worn or damaged. If pressure and fan speed are both
low, consider that the gear pump is worn or damaged
(see Engine Cooling Fan Circuit Gear Pump Flow Test
in this section).
NOTE: If pressure and fan speed are both low and gear
pump flow proves to be correct, suspect that seals in fan
drive manifold are leaking or faulty (see Fan Drive Manifold Service in the Service and Repairs section of this
chapter).
8. When testing is complete, remove pressure gauge
and reconnect wire harness to PRV solenoid. Lower and
secure hood and operator seat.

Groundsmaster 4000--D/4010--D

Page 4 -- 67

Hydraulic System

RV2
S1

LIFT
MANIFOLD

TESTER
FAN DRIVE
MANIFOLD

RV1

S5
S2

S6
S4

.035

.070

FILTER
MANIFOLD

4WD
MANIFOLD

TRACTION
MANIFOLD

Engine Cooling Fan Circuit Gear Pump Flow (Using Tester with Pressure Gauge and
Flow Meter)

FROM PTO MANIFOLDS

TO PTO (MOW) CIRCUIT
FROM DECK MOTORS

TO PTO (MOW) CIRCUIT

Hydraulic System

Page 4 -- 68

Rev. A

FROM RH PTO
CIRCUIT

FROM RH PTO
MANIFOLD

FROM FRONT PTO MANIFOLD

Groundsmaster 4000--D/4010--D

CAUTION
Prevent personal injury and/or damage to equipment. Read all WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the beginning
of this section.

6. While watching tester pressure gauges, slowly close
tester flow control valve until 1000 PSI (69 bar) is obtained on gauge. Verify engine speed continues to be
2870 RPM.
GAUGE READING TO BE: Flow approximately 7
GPM (26 LPM) at 1000 PSI (69 bar).
NOTE: If engine speed drops below 2870 RPM, pump
flow will decrease.
7. Open tester flow control valve, stop engine and record test results.
8. If a pressure of 1000 PSI (69 bar) could not be obtained or flow is lower than 6 GPM (23 LPM), check for
restriction in pump intake line. If intake line is not restricted, consider that gear pump section for engine
cooling fan circuit is worn or damaged.
9. When testing is complete, remove tester and reconnect hose to pump fitting.

3. With the engine off and cutting decks lowered, disconnect the hydraulic hose from the 90o fitting in the last
gear pump section which supplies the engine cooling
fan circuit (Fig. 54).

IMPORTANT: Make sure that the oil flow indicator
arrow on the flow gauge is showing that the oil will
flow from the pump section, through the tester and
into the hydraulic hose.

1
4

4. Install tester (flow and pressure) in series between
the fitting and the disconnected hose. Make sure the
flow control valve on tester is fully open.
IMPORTANT: The pump is a positive displacement
type. If pump flow is completely restricted or
stopped, damage to the pump, tester or other components could occur.
5. Start the engine and move throttle to high idle speed
(2870 RPM). DO NOT engage the cutting decks.

Groundsmaster 4000--D/4010--D

3
Figure 54
1. Gear pump
2. Fan drive manifold

Page 4 -- 69

3. Engine cooling hose
4. 90o fitting

Hydraulic System

Hydraulic
System

Procedure for Engine Cooling Fan Circuit Gear
Pump Flow Test

Adjustments
Traction Linkage Adjustment

21
10

29
6

20
12
13

11
17

18
7
26

RIGHT

FRONT

Figure 55
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

Traction pedal
Cap screw (4 used)
Hex nut
Pedal stop
Washer head screw (2 used)
Pedal bracket
Lock nut (4 used)
Traction rod
Slotted roll pin
Lock nut

11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Flat washer
Compression spring
Spring retainer
Roll pin
Spring bracket
Spring shaft
Jam nut
Cap screw
Rod end
Spacer

Adjustment of the traction linkage should be checked
whenever traction drive components are replaced or removed.
Assembly Adjustments
1. Traction pedal stop should be 1.500” (38 mm) above
platform bracket (item 1 in Fig. 56). If necessary, loosen
jam nuts and adjust stop location. Make sure that both
jam nuts are tightened to secure adjustment.

Hydraulic System

21.
22.
23.
24.
25.
26.
27.
28.
29.

Traction lever
Lock nut
Spacer
Flange bushing
Cap screw
Grease fitting
Traction pump control arm
Hex nut
Flat washer

2. On traction pump end of traction rod, rod end should
be installed so that distance from end of traction rod to
center of rod end is 1.140” (29 mm) (item 3 in Fig. 56).
Tighten jam nut to secure rod end to traction rod.
3. On traction lever end of traction rod (item 4 in Fig.
56), jam nuts should position traction rod so traction
pedal remains in the neutral detent position and is at an
approximate 56o angle. Use a magnetic protractor to
check pedal angle.

Page 4 -- 70

Groundsmaster 4000--D/4010--D

4. With ignition switch in the ON position (engine not
running), use Diagnostic Display to make sure that neutral switch is closed when traction pedal is released to
the neutral detent position (see Diagnostic Display in the
Troubleshooting section of Chapter 5 -- Electrical System).

7. Shut engine off.

Adjustments with Engine Running

9. Lower machine to ground.

8. After adjustments have been made and all fasteners
are tightened, make sure that traction rod does not contact anything through both forward and reverse directions.

CAUTION

1
5

All wheels will be off the ground and rotating during the following procedure. Make sure machine
is supported so it will not move and accidentally
fall to prevent injuring anyone near the machine.

1. Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 -- Safety).
4

2. Start engine and make sure that Hi/Low switch is in
the Low (4WD) position. Depress traction pedal to allow
oil flow through the traction circuit. Allow all wheels to rotate to warm up the hydraulic oil.

Figure 56
1. Pedal stop height
2. Traction pump end
3. Rod end dimension

4. When traction pedal is released from either forward
or reverse, pedal should return to the neutral position
and wheels should stop rotating. If necessary, adjust
spring shaft (item 5 in Fig. 56) until neutral operation is
correct.

4. Traction lever end
5. Neutral adjustment

1
3

5. With the engine running, the transport cylinder on
engine should extend when Hi/Low speed switch is
moved to the Hi speed (2WD) position. This cylinder extension prevents the piston (traction) pump swash plate
from reaching full stroke when in Hi speed (2WD). Also,
the traction pedal should not contact the pedal stop
when fully depressed in Hi speed (2WD).

2
4

6. Adjust the transport cylinder as follows (Fig. 57):
A. Place Hi/Low speed switch in the Hi speed (2WD)
position.
B. Lock one front wheel by applying the wheel
brake.

Figure 57
1. Transport cylinder
2. Pump control arm

3. Cap screw
4. Jam nut

C. Use a phototac to measure the other front wheel
speed. When the traction pedal is fully depressed to
forward, the wheel speed should be from 370 to 422
RPM.
D. If wheel speed is incorrect, adjust cap screw in
transport cylinder to provide correct wheel speed.
Make sure that jam nut is tightened after any adjustment.
Groundsmaster 4000--D/4010--D

Page 4 -- 71

Hydraulic System

Hydraulic
System

3. The traction pedal should contact the pedal stop
when fully depressed. At this point, the piston pump
should be at full stroke.

Service and Repairs
General Precautions for Removing and Installing Hydraulic System Components
Before Repair or Replacement of Components

After Repair or Replacement of Components

1. Before removing any parts from the hydraulic system, park machine on a level surface, apply parking
brake, lower cutting decks or attachments and stop engine. Remove key from the ignition switch.

1. Check oil level in the hydraulic reservoir and add correct oil if necessary. Drain and refill hydraulic system
reservoir and change oil filter if component failure was
severe or system is contaminated (see Flush Hydraulic
System in this section).

2. Clean machine before disconnecting, removing or
disassembling any hydraulic components. Make sure
hydraulic components, hoses connections and fittings
are cleaned thoroughly. Always keep in mind the need
for cleanliness when working on hydraulic equipment.

WARNING
Before disconnecting or performing any work
on the hydraulic system, all pressure in the system must be relieved. See Relieving Hydraulic
System Pressure in the General Information section in this chapter.
3. Put caps or plugs on any hydraulic lines, hydraulic fittings and components left open or exposed to prevent
contamination.
4. Put labels on disconnected hydraulic lines and
hoses for proper installation after repairs are completed.
5. Note the position of hydraulic fittings (especially elbow fittings) on hydraulic components before removal.
Mark parts if necessary to make sure they will be aligned
properly when installing hydraulic hoses and tubes.

2. Lubricate O--rings and seals with clean hydraulic oil
before installing hydraulic components.
3. Make sure caps or plugs are removed from the hydraulic tubes, hydraulic fittings and components before
reconnecting.
4. Use proper tightening methods when installing hydraulic hoses and fittings (see Hydraulic Hose and Tube
Installation and Hydraulic Fitting Installation in the General Information section of this chapter).
5. After repairs, check control linkages or cables for
proper adjustment, binding or broken parts.
6. After disconnecting or replacing any hydraulic components, operate machine functions slowly until air is
out of system (see Charge Hydraulic System in this section).
7. Check for hydraulic oil leaks. Shut off engine and correct leaks if necessary. Check oil level in hydraulic reservoir and add correct oil if necessary.

Check Hydraulic Lines and Hoses
IMPORTANT: Check hydraulic lines and hoses daily
for leaks, kinked lines, loose mounting supports,
wear, loose fittings or any hose deterioration. Make
all necessary repairs before operating.

WARNING
Keep body and hands away from pin hole leaks
or nozzles that eject hydraulic fluid under high
pressure. Use paper or cardboard, not hands, to
search for leaks. Hydraulic fluid escaping under
pressure can have sufficient force to penetrate
the skin and cause serious injury. If fluid is injected into the skin, it must be surgically removed within a few hours by a doctor familiar
with this type of injury. Gangrene may result from
such an injury.

Hydraulic System

Page 4 -- 72

Groundsmaster 4000--D/4010--D

Flush Hydraulic System
IMPORTANT: Flush the hydraulic system any time
there is a severe component failure or the system is
contaminated. Contaminated oil may appear milky
or black or may contain metal particles.
IMPORTANT: If a component failure occurred in the
closed loop traction circuit (e.g. piston pump or
wheel motor), filtering the traction circuit is recommended. See Filtering Closed--Loop Traction Circuit
in this section.
1. Park machine on a level surface. Lower cutting
decks to the ground, stop engine and apply parking
brake. Remove key from the ignition switch.

6. Connect all hydraulic hoses, lines and components
that were disconnected while draining system.
NOTE: Use only hydraulic fluids specified in the Operator’s Manual. Other fluids may cause system damage.
7. Fill hydraulic reservoir with new hydraulic fluid.
8. Disconnect electrical connector from engine run solenoid.
9. Turn ignition key switch and engage starter for ten
(10) seconds to prime hydraulic pumps. Wait fifteen (15)
seconds to allow the starter motor to cool and then repeat cranking procedure again.
10.Connect electrical connector to engine run solenoid.

Before disconnecting or performing any work
on the hydraulic system, all pressure in the system must be relieved. See Relieving Hydraulic
System Pressure in the General Information section in this chapter.

11. Start engine and let it idle at low speed (1450 RPM)
for a minimum of two (2) minutes. Increase engine
speed to high idle (2870 RPM) for minimum of one (1)
minute under no load.
12.Raise and lower cutting decks several times. Turn
steering wheel fully left and right several times.

IMPORTANT: Make sure to clean around any hydraulic connections that will be disconnected for
draining.

13.Shut off engine and check for hydraulic oil leaks.
Check oil level in hydraulic reservoir and add correct
amount of oil if necessary.

2. Drain hydraulic reservoir. Remove suction screen
from reservoir and clean thoroughly. Consider removing
and cleaning reservoir if necessary.

14.Operate machine for two (2) hours under normal operating conditions.

3. Drain hydraulic system. Drain all hoses, tubes and
components while the system is warm.

15.Check condition of hydraulic oil. If the new fluid
shows any signs of contamination, repeat steps 1
through 14 again until oil is clean.

4. Change and replace both hydraulic oil filters.
5. Inspect and clean hydraulic reservoir (see Hydraulic
Reservoir Inspection in this section).

Groundsmaster 4000--D/4010--D

16.Assume normal operation and follow recommended
maintenance intervals.

Page 4 -- 73

Hydraulic System

Hydraulic
System

WARNING

Filtering Closed--Loop Traction Circuit
Filtering of a closed--loop hydraulic system after a major
component failure (e.g. traction (piston) pump or front
wheel motor) is a requirement to prevent debris from
transmitting throughout the system. If a closed--loop hydraulic system filtering tool is not used to ensure system
cleanliness, repeat failures, as well as subsequent damage to other hydraulic components in the affected system, will occur. To effectively remove contamination
from closed--loop traction circuit, use of the Toro high
flow hydraulic filter and hydraulic hose kits are recommended (see Special Tools in this chapter).
1. Park machine on a level surface with engine stopped
and key removed from ignition switch.
2. Raise and support machine so all wheels are off the
ground (see Jacking Instructions in Chapter 1 -- Safety).
NOTE: If front wheel or rear axle motor was replaced,
install high flow filter to the inlet of new motor instead of
to the traction pump fitting. This will prevent system contamination from entering and damaging the new motor.
3. Thoroughly clean junction of hydraulic hose and left
side elbow fitting on bottom of traction pump (Fig. 58).
Disconnect hose from left side pump fitting.

7. With engine running at low idle speed, slowly move
the traction pedal to the forward direction to allow flow
through the traction circuit and high flow filter. Keep traction circuit engaged for five (5) minutes while gradually
increasing both forward pressure on traction pedal and
engine speed. Monitor filter indicator to make sure that
green color is showing during operation.
8. With engine running at high idle speed and traction
pedal moved to the forward direction, periodically apply
brakes to increase pressure in traction circuit. While
monitoring filter indicator, continue this process for an
additional five (5) minutes.
IMPORTANT: If using a filter that is not the bi--directional Toro high flow filter, do not press the traction
pedal in the reverse direction. If flow is reversed
when using a filter that is not bi--directional, debris
from the filter will re--enter the traction circuit.
9. With engine running at high idle speed, alternately
move traction pedal from forward to reverse. While monitoring filter indicator, continue this process for an additional five (5) minutes.
10.Shut engine off and remove key from ignition switch.

4. Connect Toro high flow hydraulic filter in series between traction pump fitting and disconnected hose. Use
hydraulic hose kit (see Special Tools in this chapter) to
connect filter to machine. Make sure that fitting and hose
connections are properly tightened.

11. Remove high flow hydraulic filter and hydraulic hose
kit from machine. Connect hydraulic hose to left side
traction pump fitting. Make sure to properly tighten hose
(see Hydraulic Hose and Tube Installation in the General Information section of this chapter).

IMPORTANT: Use only hydraulic fluids specified in
Operator’s Manual. Other fluids could cause system
damage.

12.Lower machine to ground.

5. After installing high flow filter to machine, check and
fill hydraulic reservoir with new hydraulic oil as required.

13.Check oil level in hydraulic reservoir and add correct
oil if necessary.

6. Start engine and run at idle speed. Check for any hydraulic leakage from filter and hose connections. Correct any leaks before proceeding.

RIGHT
FRONT
1

CAUTION
All wheels will be off the ground and rotating during this procedure. Make sure machine is well
supported so it will not move and accidentally
fall to prevent injuring anyone around machine.
IMPORTANT: While engaging the traction circuit,
monitor the indicator on the high flow hydraulic filter. If the indicator should show red, either reduce
pressure on the traction pedal or reduce engine
speed to decrease hydraulic flow through the filter.
Hydraulic System

2
Figure 58
1.

Page 4 -- 74

Piston (traction) pump

2. Left side fitting/hose

Groundsmaster 4000--D/4010--D

Charge Hydraulic System

IMPORTANT: Change hydraulic oil filters whenever
hydraulic components are repaired or replaced.

11. After the hydraulic system starts to show signs of fill,
actuate a lift switch until the lift cylinder rod moves in and
out several times. If the cylinder rod does not move after
10 to 15 seconds, or the pump emits abnormal sounds,
shut the engine off immediately and determine cause or
problem. Inspect for the following:
A. Loose filter or suction lines.

1. Park machine on a level surface. Lower cutting
decks, stop engine and apply parking brake. Remove
key from the ignition switch.

B. Blocked suction line.

2. Make sure all hydraulic connections, lines and components are secured tightly.

D. Faulty gear pump.

3. If component failure was severe or the system is contaminated, flush and refill hydraulic system and tank
(see Flush Hydraulic System in this section).
4. Make sure hydraulic reservoir is full. Add correct hydraulic oil if necessary.
5. Check control rod to the piston (traction) pump for
proper adjustment, binding or broken parts.
6. Disconnect wire harness electrical connector from
the engine run solenoid to prevent the engine from starting.
7. Make sure traction pedal and lift control lever are in
the neutral position. Turn ignition key switch and engage starter for ten (10) seconds to prime the traction
and gear pumps. Wait fifteen (15) seconds to allow the
starter motor to cool and then repeat cranking procedure again.
8. Reconnect wire harness electrical connector to engine run solenoid.

WARNING

C. Faulty charge relief valve in control manifold.

12.If cylinder does move in 10 to 15 seconds, proceed
to step 13.
13.Operate the traction pedal in the forward and reverse
directions. The wheels off the ground should rotate in
the proper direction.
A. If the wheels rotate in the wrong direction, stop
engine and check for proper hose connections at
traction pump and motors. Correct as needed.
B. If the wheels rotate in the proper direction, stop
engine.
14.Adjust traction pedal to the neutral position.
15.Check operation of the traction interlock switch (see
Check Interlock System in Chapter 5 -- Electrical System).
16.Remove blocks from frame and lower machine. Remove chocks from remaining wheels.
17.If the piston (traction) pump or a traction motor was
replaced or rebuilt, run the machine so all wheels turn
slowly for ten (10) minutes.
18.Operate machine by gradually increasing its work
load to full over a ten (10) minute period.

Before jacking up the machine, review and follow
Jacking Instructions in Chapter 1 -- Safety.
9. Raise one front and one rear wheel off the ground
and place appropriate jack stands under the frame to
support the machine. Chock remaining wheels to prevent movement of the machine.

19.Stop the machine. Check hydraulic reservoir and fill
if necessary. Check hydraulic components for leaks and
tighten any loose connections.

10.Make sure traction pedal and lift control lever are in
neutral. Start engine and run it at low idle (1450 rpm).
The charge pump should pick up oil and fill the hydraulic
system. If there is no indication of fill in thirty (30) seconds, stop the engine and determine the cause.
Groundsmaster 4000--D/4010--D

Page 4 -- 75

Hydraulic System

Hydraulic
System

NOTE: When initially starting the hydraulic system with
new or rebuilt components such as motors, pumps or lift
cylinders, it is important that the hydraulic system be
charged properly. Air must be purged from the system
to reduce the chance of component damage.

Hydraulic Reservoir

18 9

9 10

13
11

27
15

1
6
17

3
2

30 to 40 in--lb
(3.4 to 4.5 N--m)
(minimum)

21
4
8

20
31
28

RIGHT
NOTE: HYDRAULIC COMPONENTS
ATTACHED TO FRONT FRAME ARE
NOT SHOWN IN ILLUSTRATION

FRONT
29

Figure 59
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Hydraulic reservoir
Petcock
O--ring
Strap
Felt strap (2 used)
Bushing (2 used)
Bushing
Strap
Stand pipe (2 used)
Hose clamp (2 used)
Screen filter

Hydraulic System

12.
13.
14.
15.
16.
17.
18.
19.
20.
21.

Dipstick
O--ring
Reservoir cap
Suction hose
Tank strainer
Hose clamp
Hose
Hose clamp
Cap screw
Socket head screw (3 used)

Page 4 -- 76

22.
23.
24.
25.
26.
27.
28.
29.
30.
31.

Lock nut (3 used)
Hose
Hose
Elbow fitting
Flange nut
O--ring
Flat washer (6 used)
Front frame
Flange nut (6 used)
Cap screw (6 used)

Groundsmaster 4000--D/4010--D

Removal (Fig. 59)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Remove front cutting deck (see Front Cutting Deck
Removal in the Service and Repairs section of Chapter
8 -- Cutting Decks).

Inspection
1. Clean hydraulic reservoir and suction strainer with
solvent.
2. Inspect reservoir for leaks, cracks or other damage.
Installation (Fig. 59)
1. Using a wrench, turn tank strainer into port at least
1--1/2 to 2 full turns beyond finger tight.
2. Position reservoir to machine.

3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

3. Carefully raise front frame assembly to main frame.
Align frame mounting holes and support front frame to
prevent it from moving.

4. Drain reservoir into a suitable container.

4. Secure front frame to main frame with cap screws
(item 31), flat washers (item 28) and flange nuts (item
30). Tighten two (2) fasteners at rear of frame before
tightening top four (4) fasteners.

5. Disconnect hydraulic hoses from reservoir. Label
disconnected hydraulic lines for proper installation.
6. Remove straps (items 4 and 8) that secure reservoir
to front frame. Remove felt straps (item 5) from between
straps and reservoir.
7. To allow front frame to be lowered for reservoir removal, remove hydraulic tubes that connect hydraulic
components on front frame (wheel motors, front deck
PTO manifold and traction manifold) to components on
main frame. Put caps or plugs on open hydraulic lines
and fittings.
8. Chock rear wheels to prevent the machine from moving. Use jack or hoist to raise front of machine and support machine with jackstands.
9. Support front frame to prevent it from moving.
10.Remove cap screws (item 31), flat washers (item 28)
and flange nuts (item 30) that secure front frame to main
frame.
11. Carefully lower front frame assembly to allow clearance for reservoir removal. Once lowered, support front
frame to prevent it from shifting.

5. Lower machine to ground.
6. Position felt straps (item 5) between straps and reservoir. Secure reservoir to front frame with straps (items
4 and 8).
7. Remove caps and plugs from hydraulic lines and fittings that were placed during the removal process. Using labels placed during reservoir removal, connect
hydraulic hoses and tubes to fittings on reservoir, wheel
motors and hydraulic manifolds (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
8. Install front cutting deck (see Front Cutting Deck
Installation in the Service and Repairs section of Chapter 8 -- Cutting Decks).
9. Fill reservoir with new hydraulic fluid to proper level.
10.Properly fill hydraulic system (see Charge Hydraulic
System in this section).
11. Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.

12.Carefully remove hydraulic reservoir from machine.

Groundsmaster 4000--D/4010--D

Page 4 -- 77

Hydraulic System

Hydraulic
System

NOTE: The front frame needs to be lowered from the
main frame to allow clearance to remove the hydraulic
reservoir from the machine.

Hydraulic Oil Cooler
8
9
4

RIGHT

19
19
5

8
7

FRONT

9
10
2

11
12

13
14
15
16
12
17
18
12 ft--lb
(16 N--m)

Figure 60
1.
2.
3.
4.
5.
6.
7.

Radiator
RH radiator support
Top radiator support
Knob (2 used)
Oil cooler bracket
Retaining ring (2 used)
Carriage screw (2 used)

Hydraulic System

8.
9.
10.
11.
12.
13.

O--ring
90o hydraulic fitting (2 used)
O--ring
Cap screw (2 used)
Lock washer (6 used)
Oil cooler

Page 4 -- 78

14.
15.
16.
17.
18.
19.

Flange nut (2 used)
Cap screw(2 used)
Oil cooler mount plate (2 used)
Cap screw (4 used)
LH radiator support
Hydraulic hose (2 used)

Groundsmaster 4000--D/4010--D

Removal (Fig. 60)

CAUTION
CAUTION

The radiator and oil cooler may be hot. To avoid
possible burns, allow the engine and cooling
systems to cool before working on the oil cooler.
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

Use eye protection such as goggles when using
compressed air.
2. Dry inside of oil cooler using compressed air in the
opposite direction of the oil flow.
3. Plug both ends of oil cooler. Clean exterior of cooler.
Make sure fins are clear of dirt and debris.
4. The oil cooler should be free of corrosion, cracked
tubes and excessive pitting of tubes.
Installation (Fig. 60)

3. Remove oil cooler using Figure 60 as a guide.

1. Install oil cooler using Figure 60 as a guide.

Inspection

2. Fill reservoir with hydraulic fluid as required.

Hydraulic
System

1. Back flush oil cooler with cleaning solvent. After cooler is clean, make sure all solvent is drained from the
cooler.

Groundsmaster 4000--D/4010--D

Page 4 -- 79

Hydraulic System

Gear Pump

15
11

33
24

103 to 118 ft--lb
(140 to 160 N--m)

24
22
21

19
8

7
13 12

17
27

22
18

RIGHT

30
Loctite #242
79 to 84 ft--lb
(108 to 113 N--m)

Loctite #242
79 to 84 ft--lb
(108 to 113 N--m)

25
26

FRONT

30 to 40 in--lb
(3.4 to 4.5 N--m)

28
29

Figure 61
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Hydraulic T fitting
Roll pin
90o hydraulic fitting
Piston pump
Flat washer (2 used)
Cap screw (2 used)
Hydraulic fitting (2 used)
90o hydraulic fitting
Hydraulic fitting
Hydraulic hose
O--ring
Pump spacer

Hydraulic System

13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.

O--ring (2 used)
O--ring
90o hydraulic fitting (2 used)
Pump coupler
O--ring
Flat washer (2 used)
Cap screw (2 used)
Engine
Gear pump
O--ring
Hydraulic hose
O--ring

Page 4 -- 80

25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

Hose clamp
Hydraulic hose
O--ring
Hose clamp
Hydraulic hose
O--ring
O--ring
Hydraulic hose
Hydraulic hose
Hydraulic fitting
Washer

Groundsmaster 4000--D/4010--D

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Raise and support machine to gain access to gear
pump from the underside of the machine.
3. Drain the hydraulic reservoir.
4. To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump and fittings.
5. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
6. Disconnect hydraulic lines from gear pump and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper installation.
7. Support gear pump assembly to prevent it from falling.
8. Remove two (2) cap screws and washers securing
gear pump to piston pump. Lower and remove gear
pump, coupler, spacer and O--rings from machine.
9. If hydraulic fittings are to be removed from gear
pump, mark fitting orientation to allow correct assembly.
Remove fittings from pump and discard O--rings.
Installation (Fig. 61)
1. If fittings were removed from gear pump, lubricate
and place new O--rings onto fittings. Install fittings into
pump openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Information section of this chapter).

2. Lubricate new O--rings (item 13) with clean hydraulic
oil. Position O--rings on gear pump and pump spacer
flanges.
3. Slide coupler onto the piston pump output shaft.
4. Apply Loctite #242 (or equivalent) to threads of cap
screws (item 19) used to secure gear pump to piston
pump.
5. Position pump spacer to gear pump. Align gear teeth
and slide gear pump input shaft into coupler. Secure
gear pump to piston pump with two (2) cap screws and
flat washers. Torque screws from 79 to 84 ft--lb (108 to
113 N--m).
6. Remove caps and plugs from hydraulic lines and fittings. Using labels placed during pump removal, properly install lines to gear pump (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
7. Lower machine to ground.
8. Replace hydraulic filter and fill hydraulic reservoir
with new hydraulic oil.
9. Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime the hydraulic
pump by turning the ignition key switch to start and
cranking the engine for ten (10) seconds. Let starter cool
and then repeat cranking procedure again.
10.Connect engine run solenoid electrical connector,
start the engine and check for proper operation.
11. Properly fill hydraulic system (see Charge Hydraulic
System in this section).
12.Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.

A. If 90o hydraulic suction fitting (item 8) was removed, torque fitting nut from 103 to 118 ft--lb (140
to 160 N--m).

Groundsmaster 4000--D/4010--D

Page 4 -- 81

Hydraulic System

Hydraulic
System

Removal (Fig. 61)

Gear Pump Service

5
3

21
9
11
1

21
25
22

33 ft--lb
(45 N--m)

Figure 62
1.
2.
3.
4.
5.
6.
7.
8.
9.

Dust seal
Retaining ring
Flange washer
Shaft seal
Front cover
Dowel pin (16 used)
Pressure seal
Back--up gasket
Thrust plate (8 used)

10.
11.
12.
13.
14.
15.
16.
17.
18.

Seal (8 used)
Idler gear
Drive shaft
Back--up gasket
Pressure seal
Front body
Splined connecting shaft (3 used)
Flange
Drive gear

19.
20.
21.
22.
23.
24.
25.
26.

Body
Body
Drive gear
Idler gear
Rear body
Rear cover
Cap screw (4 used)
Washer (4 used)

Disassembly (Fig. 62)
NOTE: The gear pump must be replaced as a complete
assembly. Individual gears, housings and thrust plates
are not available separately. Disassemble gear pump
for cleaning, inspection and seal replacement only.

DIAGONAL LINE

IMPORTANT: Keep bodies, gears, flanges and
thrust plates for each pump section together; do not
mix parts between pump sections.
1. Plug pump ports and thoroughly clean exterior of
pump with cleaning solvent. Make sure work area is
clean.
2. Use a marker to make a diagonal line across the
gear pump for assembly purposes (Fig. 63).
Hydraulic System

Page 4 -- 82

Figure 63
Groundsmaster 4000--D/4010--D

IMPORTANT: Use caution when clamping gear
pump in a vise to avoid distorting any pump components.

NOTE: Pressure seals and back--up gaskets fit in
grooves machined into thrust plates. Body seals fit in
grooves machined in body faces.

3. Secure the front cover of the pump in a vise with the
drive shaft pointing down.

2. Assemble pump sections starting at front cover end.
Apply grease or petroleum jelly to new section seals to
hold them in position during gear pump assembly.

4. Loosen the four (4) cap screws that secure pump assembly.
5. Remove pump from vise and remove fasteners.
6. Support the pump assembly and gently tap the pump
case with a soft face hammer to loosen the pump sections. Be careful to not drop parts or disengage gear
mesh.

3. After pump has been assembled, tighten cap screws
by hand. Rotate the drive shaft to check for binding. Protect the shaft if using a pliers.
4. Tighten the four (4) cap screws evenly in a crossing
pattern to a torque of 33 ft--lb (45 N--m).

IMPORTANT: Mark the relative positions of the gear
teeth and the thrust plates so they can be reassembled in the same position. Do not touch the gear surfaces as residue on hands may be corrosive to gear
finish.

2
3
4

Hydraulic
System

7. Remove the thrust plates and seals from each pump
section. Before removing each gear set, apply marking
dye to mating teeth to retain ”timing”. Pump efficiency
may be affected if the teeth are not installed in the same
position during assembly. Keep the parts for each pump
section together; do not mix parts between sections.

8. Clean all parts. Check all components for burrs,
scoring, nicks and other damage.
9. Replace the entire pump assembly if parts are excessively worn or scored.
Assembly (Fig. 62)
1. Apply clean hydraulic oil to all parts before assembling.

Groundsmaster 4000--D/4010--D

Page 4 -- 83

Figure 64
1.
2.
3.
4.

LH and RH PTO pump section
Front PTO pump section
Steering, lift/lower and charge pump section
Engine cooling fan pump section

Hydraulic System

Traction Circuit
NOTE: Arrow on check valve
points toward rear of machine

RIGHT
10

FRONT

5
7
11

12
4

Figure 65
1.
2.
3.
4.
5.

Piston (traction) pump
Gear pump
LH front wheel motor
Traction manifold
RH front wheel motor

6.
7.
8.
9.

4WD manifold
Filter manifold
Rear axle motor
Cooling fan motor

10.
11.
12.
13.

Check valve
Forward traction pressure port
Hydraulic temperature sender
Reverse traction pressure port

Figure 65 illustrates the components that are used in the
Groundsmaster 4000--D and 4010--D traction circuits.
Procedures for removal, installation and disassembly/
assembly of these components are provided on the following pages of this section.

Hydraulic System

Page 4 -- 84

Groundsmaster 4000--D/4010--D

Transport Cylinder
A transport cylinder is included in the traction circuit to
reduce traction pump control arm movement when operating in Hi speed (2WD). This reduced control arm
movement limits pump swash plate rotation to prevent
excessive transport speed. The transport cylinder is attached to the forward, right side engine mount (Fig. 66).

RIGHT
FRONT
12
11

Disassembly (Fig. 66)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch. Raise and support hood.

2. To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump assembly.

4. Put a drain pan below the transport cylinder. Remove
hydraulic hose from cylinder fitting. Put plugs in hose
and fitting to prevent contamination of the system.

Figure 66
1.
2.
3.
4.
5.
6.
7.
8.

5. Remove transport cylinder assembly from engine
mount. Locate and remove cylinder spacer from between transport cylinder and engine mount.

Carriage screw (2 used)
Cylinder spacer
Transport cylinder
Lock nut (2 used)
Piston
Backup ring (2 used)
O--ring (2 used)
Retaining ring

9.
10.
11.
12.
13.
14.
15.
16.

Seal
O--ring
Fitting
O--ring
Hydraulic hose
RH engine mount
Jam nut
Cap screw

Hydraulic
System

3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

16 15

1
2

6. If cap screw is to be removed from piston, carefully
measure the distance from the piston to the end of the
cap screw before loosening the jam nut (Fig. 67). This
distance will be necessary for assembly.
7. Disassemble transport cylinder using Figure 66 as a
guide.

Assembly (Fig. 66)
MEASURE
DISTANCE

1. Lubricate all transport cylinder components with
clean hydraulic oil. Assemble transport cylinder and
install cylinder to engine mount using Figure 66 as a
guide. Make sure that cylinder spacer is between transport cylinder and engine mount.
2. If the cap screw was removed from the piston, make
sure that distance from the piston to the end of the cap
screw is the same as the distance measured before disassembly (Fig. 67).

Figure 67
1. Transport cylinder
2. Cap screw

3. Pump control arm

3. Remove plugs from hose and fitting. Install hose to
fitting on transport cylinder (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).

Groundsmaster 4000--D/4010--D

Page 4 -- 85

Hydraulic System

Piston (Traction) Pump

15
11

33
24

103 to 118 ft--lb
(140 to 160 N--m)

24
22
21

19
8

22
18

7
13

Loctite #242
79 to 84 ft--lb
(108 to 113 N--m)

17
27

RIGHT

Loctite #242
79 to 84 ft--lb
(108 to 113 N--m)

25
26

FRONT

30 to 40 in--lb
(3.4 to 4.5 N--m)

28
29

Figure 68
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.

O--ring (2 used)
O--ring
90o hydraulic fitting (2 used)
Pump coupler
O--ring
Flat washer (2 used)
Cap screw (2 used)
Engine
Gear pump
O--ring
Hydraulic hose
O--ring

Removal (Fig. 68)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. To prevent contamination of hydraulic system during
removal, thoroughly clean exterior of pump assembly.

Hydraulic System

25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

Hose clamp
Hydraulic hose
O--ring
Hose clamp
Hydraulic hose
O--ring
O--ring
Hydraulic hose
Hydraulic hose
Hydraulic fitting
Washer

3. Raise and support machine to gain access to pump
assembly from the underside of machine.
4. Remove traction rod from control arm on piston
pump by removing lock nut, spacer and cap screw (Fig.
69).

Page 4 -- 86

Groundsmaster 4000--D/4010--D

5. Disconnect wire harness connector from neutral
switch on piston pump.

6. Connect wire harness connector to neutral switch on
traction pump.

6. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

7. Remove plugs or caps from disconnected hydraulic
hoses and open ports of the pump assembly. Install fittings and hoses to correct location on gear and piston
pumps (see Hydraulic Fitting Installation and Hydraulic
Hose and Tube Installation in the General Information
section of this chapter).

8. Put a drain pan below the pump assembly. Remove
hydraulic hoses and fittings connected to piston and
gear pumps. Put plugs or caps on disconnected hydraulic hoses to prevent contamination of the system. Put
plugs in open ports of pumps.
NOTE: If fuel tank is removed from the machine, the
gear pump and piston pump can be removed as a complete assembly.
9. Remove gear pump from machine (see Gear Pump
Removal in this section).
10.Support the piston pump to prevent it from falling
while removing two (2) cap screws and washers retaining pump assembly to engine flywheel plate. Carefully
pull pump assembly from flywheel plate and raise it out
of the machine.
Installation (Fig. 68)
IMPORTANT: To prevent spring coupler damage,
make sure that piston pump is properly supported
and does not put side load into coupler during pump
installation.

8. Lower machine to ground.
9. Install new filter and fill hydraulic reservoir with correct oil.
IMPORTANT: Refer to Traction Circuit Component
Failure in the General Information section of this
chapter for information regarding the importance of
removing contamination from the traction circuit.
10.Disconnect engine run solenoid electrical connector
to prevent engine from starting. Prime pumps by turning
ignition key switch to crank engine for ten (10) seconds.
Let starter cool and then repeat cranking procedure
again.
11. Connect engine run solenoid electrical connector,
start the engine and check for proper operation.
12.Properly fill hydraulic system (see Charge Hydraulic
System in this section).
13.Stop engine and check for hydraulic oil leaks. Check
hydraulic reservoir oil level.

1. Carefully raise piston pump into the machine, align
pump input shaft to spring coupler on engine and position it to the engine flywheel plate. Support pump to prevent it from producing any side load into coupler and
also to align pilot diameter of pump to flywheel plate
bore.

Groundsmaster 4000--D/4010--D

3. While maintaining pump alignment with spring coupler and flywheel plate, install two (2) cap screws and
washers to secure piston pump to engine. Torque
screws from 79 to 84 ft--lb (108 to 113 N--m).

5. Position traction rod to control arm on piston pump
by installing cap screw, spacer and lock nut (Fig. 69).

2. Apply Loctite #242 (or equivalent) to threads of cap
screws (item 6) used to secure piston pump to engine
flywheel plate.

4. Install gear pump to piston pump (see Gear Pump
Installation).

Figure 69
1.
2.
3.
4.

Page 4 -- 87

Piston pump
Cap screw
Pump control arm
Spacer

5.
6.
7.
8.

Lock nut
Jam nut
Traction rod
Rod end

Hydraulic System

Hydraulic
System

7. For installation purposes, label all hydraulic lines that
connect to gear pump and piston pump.

Piston (Traction) Pump Service
40 to 48 in--lb
(4.5 to 5.4 N--m)

4 to 6 ft--lb
(5 to 8 N--m)

40 to 48 in--lb
(4.5 to 5.4 N--m)

25 to 28 ft--lb
(34 to 38 N--m)

48
35

14
37

41
46

100 to 110 ft--lb
(136 to 149 N--m)

27 to 31 ft--lb
(37 to 42 N--m)

27
45

38
39

10
20

28
27

10
1

18
17

6
7

100 to 110 ft--lb
(136 to 149 N--m)
12
13

6
4
2

150 to 160 in--lb
(17 to 18 N--m)

40 to 48 in--lb
(4.5 to 5.4 N--m)

Figure 70
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Drive shaft
Retaining ring
Shaft seal
Washer
Retaining ring
Thrust bearing race
Thrust bearing
Bearing
Housing
Seal set
Servo piston
Gasket
Cover plate
Flat washer (4 used per cover)
Socket head screw (4 used per cover)
Washer
Jam nut

Hydraulic System

18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

Seal washer
Plug
O--ring
Cradle
Bushing
Screw
Valve plate
Bearing
Forward relief valve
O--ring
O--ring
Bypass valve
Reverse relief valve
Cover plate
Housing gasket
Control orifice (.028) (2 used)

Page 4 -- 88

34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.

Flat washer (4 used)
Manual servo control assembly
Cap screw (4 used)
Control orifice (.036)
Backplate
Roll pin
Housing gasket
Rotating kit
Camplate
Servo piston follower
Cap screw (2 used)
Bushing dowel (2 used)
Socket head screw (6 used)
Control arm
Hex nut
Lock washer

Groundsmaster 4000--D/4010--D

Piston (Traction) Pump Service (Fig. 70)

Hydraulic
System

For service of the piston (traction) pump (including the
servo control (item 28) assembly), see the Eaton Model
72400 Servo Controlled Piston Pump Repair Information at the end of this chapter.

Groundsmaster 4000--D/4010--D

Page 4 -- 89

Hydraulic System

Rear Axle Motor
2
Arrow on side of
motor case points up

3
12

1
2

17
18

13
14

11
16

19
20
7

59 to 73 ft--lb
(80 to 99 N--m)

RIGHT
FRONT

Figure 71
1.
2.
3.
4.
5.
6.
7.

Axle motor
90o hydraulic fitting (2 used)
Hydraulic fitting
Cap screw (2 used)
Flat washer (2 used)
O--ring
External snap ring (2 used)

Hydraulic System

8.
9.
10.
11.
12.
13.
14.

Gear (45T)
External snap ring (2 used)
Pinion gear (27T)
Needle bearing
O--ring
O--ring
O--ring

Page 4 -- 90

15.
16.
17.
18.
19.
20.
21.

O--ring
Drive axle assembly
Cap screw (6 used)
Lock washer (6 used)
Dowel pin (2 used)
Cover plate
Gasket

Groundsmaster 4000--D/4010--D

Removal (Fig. 71)

Installation (Fig. 71)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

IMPORTANT: Refer to Traction Circuit Component
Failure in the General Information section of this
chapter for information regarding the importance of
removing contamination from the traction circuit.

NOTE: To ease installation, label the hydraulic hoses to
show their correct position on the axle motor.
3. Disconnect hydraulic hoses from motor. Put caps or
plugs on motor ports and hose openings to prevent contamination.
IMPORTANT: Support axle motor to prevent motor
from falling during removal.
4. Remove motor from rear axle using Figure 71 as a
guide.
5. If hydraulic fittings are to be removed from motor,
mark fitting orientation to allow correct assembly. Remove fittings from motor and discard O--rings.

1. If fittings were removed from motor, lubricate and
place new O--rings onto fittings. Install fittings into port
openings using marks made during the removal process
to properly orientate fittings. Tighten fittings (see Hydraulic Fitting Installation in the General Information
section of this chapter).
2. If removed, install pinion gear (item 10) to axle motor.
3. Install O--ring (item 6) onto motor. Position motor to
rear axle assembly making sure that arrows on the side
of motor case point upward. Align gear teeth and slide
motor into place.
4. Secure motor to axle with cap screws and flat washers. Torque screws from 59 to 73 ft--lb (80 to 99 N--m).
5. Remove plugs from motor ports and hose openings.
Using labels placed during motor removal, correctly attach hydraulic hoses to axle motor (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
6. Fill reservoir with hydraulic fluid as required.
7. Properly fill hydraulic system (see Charge Hydraulic
System in this section).
8. After assembly is completed, verify that hydraulic
hoses and fittings do not contact anything.

Groundsmaster 4000--D/4010--D

Page 4 -- 91

Hydraulic System

Hydraulic
System

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

Front Wheel Motor

2
8

13
12
16

15
9
18

1
14
11

Arrow on side of
motor case points up

11 14

RIGHT
FRONT

15
8

75 to 85 ft--lb
(101 to 115 N--m)

3 2
5

16
12

22
21

Figure 72
1.
2.
3.
4.
5.
6.
7.
8.

Front wheel motor
Internal retaining ring
Splined brake shaft
RH brake assembly
Planetary assembly
Cap screw (2 used per side)
Flat washer (2 used per side)
O--ring

Hydraulic System

9.
10.
11.
12.
13.
14.
15.
16.

Flange head screw (6 used per side)
90o hydraulic fitting
90o hydraulic fitting (3 used)
O--ring
O--ring
Hydraulic fitting (3 used)
O--ring
O--ring

Page 4 -- 92

17.
18.
19.
20.
21.
22.
23.
24.

Hydraulic fitting
O--ring
O--ring
LH brake assembly
Flange head screw (4 used per side)
Hex plug
Plug
O--ring

Groundsmaster 4000--D/4010--D

Removal (Fig. 72)

Installation (Fig. 72)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

IMPORTANT: If 90o fitting (item 10) was removed
from backplate of RH wheel motor, make sure that
straight fittings (item 14) are installed and correctly
torqued before installing 90o fitting.

NOTE: To ease installation, label the hydraulic hoses to
show their correct position on the wheel motor.
3. Disconnect hydraulic hoses and tubes from wheel
motor. Put caps or plugs on motor ports and hose openings to prevent contamination.
IMPORTANT: Before loosening fasteners, support
wheel motor to prevent motor from falling during removal.
4. Remove wheel motor using Figure 72 as a guide.
5. If hydraulic fittings are to be removed from motor,
mark fitting orientation to allow correct assembly. Remove fittings from motor and discard O--rings.

1. If fittings were removed from motor, lubricate and
place new O--rings onto fittings. Install fittings into port
openings using marks made during the removal process
to properly orientate fittings. Tighten fittings (see Hydraulic Fitting Installation in the General Information
section of this chapter).
2. Install O--ring (item 8) onto motor. Position wheel
motor to brake assembly making sure that arrows on the
side of motor case point upward.
3. Align splines on motor shaft and splined brake shaft.
Slide motor into brake assembly.
4. Secure motor to brake assembly with cap screws
and flat washers. Tighten cap screws from 75 to 85 ft--lb
(101 to 115 N--m).
5. Remove plugs from wheel motor ports and hose
openings. Using labels placed during motor removal,
correctly attach hydraulic hoses and tubes to wheel motor (see Hydraulic Hose and Tube Installation in the
General Information section of this chapter).
6. Fill reservoir with hydraulic fluid as required.
7. Properly fill hydraulic system (see Charge Hydraulic
System in this section).

Groundsmaster 4000--D/4010--D

Page 4 -- 93

Hydraulic System

Hydraulic
System

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

Rear Axle and Front Wheel Motor Service
15 to 18 ft--lb
(20 to 24 N--m)

7
2

1
11
18
8
6

14
15
16
12
4

5
3
17

Figure 73
1.
2.
3.
4.
5.
6.

Drive shaft
Backplate (front motor shown)
Housing assembly
Rotating assembly
Cam plate insert
Retaining ring

7.
8.
9.
10.
11.
12.

Cap screw (6 used)
Shaft seal
Retaining ring
Thrust race
O--ring
Valve plate

NOTE: The front wheel motors are identical. The rear
axle motor has some differences from the front motors.
Service of the front and rear motors requires the same
procedures.

Hydraulic System

13.
14.
15.
16.
17.
18.

Thrust bearing
Roll pin (3 used)
Roll pin
Bearing
Bearing
Washer

NOTE: For service of the wheel motors, see the Eaton
Model 74318 and 74348 Piston Motors: Fixed Displacement, Valve Plate Design Repair Information at the end
of this chapter.

Page 4 -- 94

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 95

Hydraulic System

4WD Manifold
2

RIGHT

8
11

9
17

FRONT

7
13
12

16
7
4

1
19

Figure 74
1.
2.
3.
4.
5.
6.
7.

Frame assembly
4WD manifold
90o hydraulic fitting
O--ring
O--ring
Quick fitting
O--ring

8.
9.
10.
11.
12.
13.

Dust cap
Hydraulic fitting
O--ring
O--ring
90o hydraulic fitting
O--ring

14.
15.
16.
17.
18.
19.

Hydraulic fitting
Adapter
Hydraulic fitting
O--ring
Cap screw (2 used)
Flange nut (2 used)

NOTE: The ports on the 4WD manifold are marked for
easy identification of components. Example: P1 is a piston pump connection port and SV is the location for the
solenoid valve (see Hydraulic Schematic in Chapter 10
-- Foldout Drawings to identify the function of the hydraulic lines and cartridge valves at each port).

Hydraulic System

Page 4 -- 96

Groundsmaster 4000--D/4010--D

Removal (Fig. 74)

Installation (Fig. 74)

1. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

1. If fittings were removed from manifold, lubricate and
place new O--rings onto fittings. Install fittings into manifold openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Information section of this chapter).

NOTE: Removal of the radiator (see Radiator Removal
in the Service and Repairs section of Chapter 3 -- Kubota
Diesel Engine) or rear axle (see Rear Axle Assembly
Removal in the Service and Repairs section of Chapter
6 -- Axles, Planetaries and Brakes) will improve access
to 4WD manifold.
2. Disconnect wire harness connector from the solenoid valve coil.
3. To prevent contamination of hydraulic system during
manifold removal, thoroughly clean exterior of manifold
and fittings.
4. Disconnect hydraulic lines from manifold and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper installation.

2. Install hydraulic manifold to the frame using Figure
74 as a guide.
3. Remove caps and plugs from fittings and hoses. Using labels placed during manifold removal, properly connect hydraulic lines to manifold (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
4. Connect wire harness connector to the solenoid
valve coil.
5. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.

5. Remove hydraulic manifold from the frame using
Figure 74 as a guide.

Groundsmaster 4000--D/4010--D

Page 4 -- 97

Hydraulic
System

6. If hydraulic fittings are to be removed from manifold,
mark fitting orientation to allow correct assembly. Remove fittings from manifold and discard O--rings.

Hydraulic System

4WD Manifold Service

35 ft--lb
(47 N--m)
25 ft--lb
(34 N--m)

10
13

REAR
DOWN

50 ft--lb
(67 N--m)

8
7

1
13

UP
FRONT

3
20 ft--lb
(27 N--m)

PLUG TORQUE
#4 Zero Leak: 20 ft--lb (27 N--m)
#6 Zero Leak: 25 ft--lb (34 N--m)
#8 Zero Leak: 50 ft--lb (67 N--m)

5 ft--lb
(6.7 N--m)

10
11
12

Figure 75
1.
2.
3.
4.
5.

4WD manifold body
Solenoid valve (port SV)
Solenoid coil
Check valve (port CV)
Nut

6.
7.
8.
9.

Directional valve (ports PD1 & PD2)
Pressure reducing valve (port PR)
Relief valve (port RV)
Orifice (0.030) (port SV)

Hydraulic System

10.
11.
12.
13.

#4 zero leak plug with O--ring
#6 zero leak plug with O--ring
Orifice (0.050) (ports OR1 & OR2)
#8 zero leak plug with O--ring

NOTE: The 4WD manifold uses several zero leak
plugs. These plugs have a tapered sealing surface on
the plug head that is designed to resist vibration induced
plug loosening. The zero leak plugs also have an O--ring
as a secondary seal. If zero leak plug removal is necessary, lightly rap the plug head using a punch and hammer before using an allen wrench to remove the plug:
the impact will allow plug removal with less chance of
damage to the socket head of the plug.

Page 4 -- 98

Groundsmaster 4000--D/4010--D

1. Make sure the manifold is clean before removing any
of the cartridge valves.
2. If cartridge valve is solenoid operated, remove nut
securing solenoid to the cartridge valve. Carefully slide
solenoid off the valve.
IMPORTANT: Use care when removing cartridge
valves. Slight bending or distortion of the stem tube
can cause binding and malfunction. Make sure that
deep well socket fully engages the valve base.
3. Remove cartridge valve with a deep well socket.
Note correct location for O--rings, sealing rings and
backup rings. Remove and discard seal kit.
4. Visually inspect the port in the manifold for damage
to the sealing surfaces, damaged threads or contamination.

7. The 4WD manifold includes three (3) orifice fittings
(items 9 and 12). The 0.030 orifice (item 9) is positioned
in the SV port under the solenoid cartridge valve. The
0.050 orifices (item 12) thread into the manifold in ports
OR1 and OR2. Before removing or installing the orifice
in OR1, removal of the #6 plug in the bottom of the manifold is necessary.
8. Reinstall the cartridge valve:
A. Lubricate new seal kit components with clean hydraulic oil and install on valve. The O--rings, sealing
rings and backup rings must be arranged properly on
the cartridge valve for proper operation and sealing.
IMPORTANT: Use care when installing cartridge
valves. Slight bending or distortion of the stem
tube can cause binding and malfunction. Make
sure that deep well socket fully engages the
valve base.

5. Visually inspect cartridge valve for damaged sealing
surfaces and contamination.

B. Lubricate threads of cartridge with clean hydraulic oil. Thread cartridge valve carefully into manifold
port. The valve should go in easily without binding.

A. Contamination may cause valves to stick or hang
up. Contamination can become lodged in small valve
orifices or seal areas causing malfunction.

C. Torque cartridge valve using a deep well socket
to value identified in manifold illustration.

B. If valve sealing surfaces appear pitted or damaged, the hydraulic system may be overheating or
there may be water in the system.

D. If cartridge is solenoid operated, carefully install
solenoid coil to the cartridge valve. Torque nut to value identified in manifold illustration.
9. If problems still exist, remove valve and clean again
or replace valve.

CAUTION
Use eye protection such as goggles when using
compressed air.
6. Clean cartridge valve using clean mineral spirits.
Submerge valve in clean mineral spirits to flush out contamination. Particles as fine as talcum powder can affect
the operation of high pressure hydraulic valves. If cartridge design allows, use a wood or plastic probe to push
the internal spool in and out 20 to 30 times to flush out
contamination. Be extremely careful not to damage cartridge. Use compressed air for cleaning.

Groundsmaster 4000--D/4010--D

Page 4 -- 99

Hydraulic System

Hydraulic
System

4WD Manifold Service (Fig. 75)

Traction (Flow Divider) Manifold
16

15
10

18
11

19
2

1
2
3
5

RIGHT
5

FRONT

Figure 76
1.
2.
3.
4.
5.
6.
7.

Traction manifold
O--ring
Hydraulic fitting
Bracket
Flange nut
Cap screw (2 used)
Hydraulic hose

8.
9.
10.
11.
12.
13.

O--ring
90o hydraulic elbow
O--ring
Hydraulic hose
Hydraulic fitting
O--ring

14.
15.
16.
17.
18.
19.

O--ring
90o hydraulic elbow
O--ring
Cap screw
O--ring
Hydraulic fitting

NOTE: The ports on the traction manifold are marked
for easy identification of hydraulic line connections. Example: P is the traction pump connection port and M1 is
the connection for the front traction motors (see Hydraulic Schematic in Chapter 10 -- Foldout Drawings to identify the function of the hydraulic lines and cartridge
valves at each port).

Hydraulic System

Page 4 -- 100

Groundsmaster 4000--D/4010--D

Removal (Fig. 76)

Installation (Fig. 76)

1. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

2. To prevent contamination of hydraulic system during
manifold removal, thoroughly clean exterior of manifold
and fittings.
3. Disconnect wire harness connector from the solenoid valve coil on the traction manifold.
4. Disconnect hydraulic lines from manifold and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper reassembly.
5. Remove traction manifold from the frame using Figure 76 as a guide.

3. Remove caps and plugs from fittings and hoses. Using labels placed during manifold removal, properly connect hydraulic lines to manifold (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
4. Connect wire harness connector to the solenoid
valve coil on the traction manifold.
5. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.

Hydraulic
System

6. If hydraulic fittings are to be removed from manifold,
mark fitting orientation to allow correct assembly. Remove fittings from manifold and discard O--rings.

2. Install traction manifold to the frame using Figure 76
as a guide.

Groundsmaster 4000--D/4010--D

Page 4 -- 101

Hydraulic System

Traction (Flow Divider) Manifold Service

50 ft--lb
(67 N--m)

FRONT

20 ft--lb
(27 N--m)

4
198 in--lb
(22.4 N--m)

40 ft--lb
(54 N--m)

20 ft--lb
(27 N--m)

10
5 ft--lb
(6.7 N--m)
20 ft--lb
(27 N--m)

9
5

198 in--lb
(22.4 N--m)

7
8

20 ft--lb
(27 N--m)

198 in--lb
(22.4 N--m)

40 ft--lb
(54 N--m)

Figure 77
1.
2.
3.
4.

Flow divider valve
Pilot directional valve
Orifice (0.020)
Traction manifold

5. Check valve
6. SAE #8 plug with O--ring
7. Solenoid coil

8. Nut
9. Solenoid cartridge valve
10. SAE #6 plug with O--ring

NOTE: The ports on the traction manifold are marked
for easy identification of components. Example: P2 is
the gear pump connection port and CD is the connection
for the case drain from the deck motors (see Hydraulic
Schematic in Chapter 10 -- Foldout Drawings to identify
the function of the hydraulic lines and cartridge valves
at each port).

Hydraulic System

Page 4 -- 102

Groundsmaster 4000--D/4010--D

Traction Manifold Service (Fig. 77)
NOTE: If the check valve (item 5) next to the pilot directional valve (item 2) needs to be removed from manifold,
remove directional valve first. When installing this check
valve, install and torque check valve before installing directional valve.

Hydraulic
System

For traction manifold cartridge valve service procedures, see 4WD Manifold Service in this section. Refer
to Figure 77 for traction (flow divider) manifold cartridge
valve and plug installation torque.

Groundsmaster 4000--D/4010--D

Page 4 -- 103

Hydraulic System

Filter Manifold

21
4
11

19
6

5
22
1
23

17
6

3
7

11
13

RIGHT
15

FRONT

Figure 78
1.
2.
3.
4.
5.
6.
7.
8.
9.

Filter manifold
45o hydraulic fitting
Test nipple
Dust cap
O--ring
O--ring
O--ring
Cap screw (3 used)
Flat washer (3 used)

10.
11.
12.
13.
14.
15.
16.
17.

Hydraulic fitting
O--ring
O--ring
90o hydraulic fitting
Hydraulic hose
O--ring
O--ring
90o hydraulic fitting

18.
19.
20.
21.
22.
23.
24.
25.

Hydraulic hose
Hydraulic tee fitting
90o hydraulic fitting
O--ring
Hose clamp
Hydraulic hose
Barb fitting
Oil filter

NOTE: The ports on the filter manifold are marked for
easy identification of components. Example: P2 is the
gear pump connection port and T is the connection for
the hydraulic reservoir return port (see Hydraulic Schematic in Chapter 10 -- Foldout Drawings to identify the
function of the hydraulic lines and cartridge valves at
each port).

Hydraulic System

Page 4 -- 104

Groundsmaster 4000--D/4010--D

Removal (Fig. 78)

Installation (Fig. 78)

1. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

2. To prevent contamination of hydraulic system during
manifold removal, thoroughly clean exterior of filter
manifold and fittings.
3. Disconnect hydraulic lines from filter manifold and
put caps or plugs on open hydraulic lines and fittings. Label disconnected hydraulic lines for proper reassembly.
4. Remove filter manifold from the frame using Figure
78 as a guide.

3. Remove caps and plugs from fittings and hoses. Using labels placed during manifold removal, properly connect hydraulic lines to manifold (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
4. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.

Hydraulic
System

5. If hydraulic fittings are to be removed from manifold,
mark fitting orientation to allow correct assembly. Remove fittings from manifold and discard O--rings.

2. Install filter manifold to the frame using Figure 78 as
a guide.

Groundsmaster 4000--D/4010--D

Page 4 -- 105

Hydraulic System

Filter Manifold Service
5
25 ft--lb
(34 N--m)

UP
FRONT

25 ft--lb
(34 N--m)
1
6

25 ft--lb
(34 N--m)
30 ft--lb
(41 N--m)
5

7
4

3
2
50 ft--lb
(67 N--m)
30 ft--lb
(41 N--m)

UP
FRONT
3

Figure 79
1. Filter manifold
2. Check valve (reservoir return)
3. Oil filter element

4. Check valve (filter bypass)
5. #6 zero leak plug with O--ring

Hydraulic System

6. Charge relief valve
7. #8 zero leak plug with O--ring

NOTE: The filter manifold uses several zero leak plugs.
These plugs have a tapered sealing surface on the plug
head that is designed to resist vibration induced plug
loosening. The zero leak plugs also have an O--ring as
a secondary seal. If zero leak plug removal is necessary,
lightly rap the plug head using a punch and hammer before using an allen wrench to remove the plug: the impact will allow plug removal with less chance of damage
to the socket head of the plug.

Page 4 -- 106

Groundsmaster 4000--D/4010--D

Filter Manifold Service (Fig. 79)

Hydraulic
System

For filter manifold cartridge valve service procedures,
see 4WD Manifold Service in this section. Refer to Figure 79 for filter manifold cartridge valve and plug installation torque.

Groundsmaster 4000--D/4010--D

Page 4 -- 107

Hydraulic System

Steering and Engine Cooling Fan Circuits
4

GROUNDSMASTER 4000--D
RIGHT
FRONT
3

7
1

Figure 80
1. Gear pump
2. Steering control valve
3. Fan drive manifold

Hydraulic System

4. Fan motor
5. Steering cylinder

Page 4 -- 108

6. Steering circuit test port (GM4000)
7. Fan circuit test port

Groundsmaster 4000--D/4010--D

Figure 80 illustrates the components that are used in the
Groundsmaster 4000--D steering and engine cooling
fan circuits. The steering control valve hydraulic lines
used on the Groundsmaster 4010--D are slightly different and are shown in Figure 81. Procedures for removal,
installation and disassembly/assembly of these components are provided on the following pages of this section.

GROUNDSMASTER 4010--D
4

1
2

Figure 81
4. Fan circuit test port
5. Steering test port

Hydraulic
System

1. Gear pump
2. Steering control valve
3. Fan drive manifold

Groundsmaster 4000--D/4010--D

Page 4 -- 109

Hydraulic System

Steering Control Valve
39

33
34
35
36
37

4
5
6

21
40

43
42

9
10

29
30
31

11
12
13
14

27
16 to 20 ft--lb
(22 to 27 N--m)

27
15
16
17

18
19

38
20

RIGHT
FRONT

Figure 82
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

Hex nut
Flat washer
Steering wheel
Foam collar
Steering seal
External snap ring (2 used)
Knob
Steering tower cover
Steering shaft
Compression spring
Cap
Rod assembly
Extension spring
Tilt rod
Lock nut (2 used)

Hydraulic System

16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.

Parking brake switch
Cotter pin
Brake pawl
Cotter pin
Lock nut (2 used)
Nut insert (10 used)
Flange head screw (10 used)
Flange bushing (2 used)
Thrust washer (as needed)
Temperature gauge
Plug
Snap ring location
Steering column
Cap screw (2 used)
Pivot hub (2 used)

Page 4 -- 110

31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.

Flange head screw (4 used)
Switch bracket
Flange nut (2 used)
Cap screw (2 used)
Steering tower
Phillips head screw (2 used)
Clevis pin
Steering control valve
Steering wheel cover
Platform wire harness
In port (P)
Right turn port (R)
Load sensing port (PB)
Left turn port (L)
Out port (T)

Groundsmaster 4000--D/4010--D

Removal (Fig. 82)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

GROUNDSMASTER 4000--D

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
3. To prevent contamination of hydraulic system during
steering control valve removal, thoroughly clean exterior of control valve and fittings.

NOTE: To ease installation, label the hydraulic lines to
show their correct position on the steering control valve.

4
5

4. Remove hydraulic lines from steering control valve.
5. Remove steering control valve from machine using
Figure 82 as a guide.

GROUNDSMASTER 4010--D

Installation (Fig. 82)

4. O--ring
5. Straight fitting (4 used)

1. If fittings were removed from steering control valve,
lubricate and place new O--rings onto fittings. Install fittings into port openings using marks made during the removal process to properly orientate fittings (Fig. 83 or
84). Tighten fittings (see Hydraulic Fitting Installation in
the General Information section of this chapter).

2. Install steering control valve using Figure 82 as a
guide.

3. Using labels placed during steering control valve removal, properly install hydraulic lines to control valve
(see Hydraulic Hose and Tube Installation in the General Information section of this chapter).

2
6

4. Make sure hydraulic tank is full.

Figure 84

5. Properly fill hydraulic system (see Charge Hydraulic
System in this section).

Groundsmaster 4000--D/4010--D

Hydraulic
System

6. If hydraulic fittings are to be removed from steering
control valve, mark fitting orientation to allow correct assembly. Remove fittings from valve and discard O--rings
(Fig. 83 or 84).

Figure 83
1. Steering control valve
2. O--ring
3. 90o hydraulic fitting

1. Steering control valve
2. O--ring
3. 90o hydraulic fitting

Page 4 -- 111

4. O--ring
5. Straight fitting (3 used)
6. 45o hydraulic fitting

Hydraulic System

Steering Control Valve Service

8
1

3
24

2
4

19
20

19
23

22
21

150 in--lb
(17 N--m)

9
11
13

12
140 to 160 in--lb
(16 to 18 N--m)

14
18

Figure 85
1.
2.
3.
4.
5.
6.
7.
8.

Steering control valve housing
Dust seal
O--ring
Spool
Spring retaining ring
Pin
Sleeve
Centering springs/spacers

9.
10.
11.
12.
13.
14.
15.
16.

Cap screw (7 used)
End cap
O--ring
Seal ring
O--ring
Geroter
O--ring
Spacer

NOTE: Cleanliness is extremely important when
repairing hydraulic components. Work in a clean area.
Before disassembly, drain the oil, then plug the ports
and thoroughly clean the exterior. During repairs,
always protect machined surfaces.
Disassembly (Fig. 85)

17.
18.
19.
20.
21.
22.
23.
24.

Geroter drive
Wear plate
Bearing race
Thrust bearing
Plug
O--ring
Relief valve
Quad seal

4. Slide the spool and sleeve assembly from the housing.
5. Remove the thrust bearing and bearing races (2).
6. Remove the quad seal.

1. Remove the seven (7) cap screws from the steering
control valve assembly.

7. Use a small blade screwdriver to carefully pry the
dust seal from the housing. Be careful to not damage the
dust seal seat in the housing.

2. Remove end cap, geroter, spacer, geroter drive,
wear plate, seal ring and O--rings from housing.

8. Remove the pin that holds the spool and sleeve together.

3. Remove the plug and relief valve.

9. Carefully slide the spool out of the sleeve. The centering springs and spring retaining ring will stay with the
spool as it is removed.

Hydraulic System

Page 4 -- 112

Groundsmaster 4000--D/4010--D

8. Put the thrust bearing and races into the housing.
The thrust bearing goes between the two races
(Fig. 86).

CAUTION
The centering springs are under tension. Remove the retaining ring carefully.

IMPORTANT: Do not damage the dust or quad seals
when installing the spool and sleeve assembly.

10.Remove the spring retaining ring and centering
springs from the spool.

9. Apply a light coating of clean hydraulic fluid to the
spool and sleeve assembly and slide carefully the assembly into the housing.

Assembly (Fig. 85)
Check all mating surfaces. Replace any parts with
scratches or burrs that could cause leakage. Wash all
metal parts in clean solvent. Blow them dry with pressurized air. Do not wipe parts dry with paper towels or cloth.
Lint in a hydraulic system will cause damage.
NOTE: Always use new seals and O--rings when assembling the steering control valve.
IMPORTANT: During assembly, lubricate the new
seals with petroleum jelly. Also, lubricate machined
surfaces and bearings with clean hydraulic fluid.

10.Clamp the housing in a vise. Use only enough clamping force to hold the housing securely.
11. Lubricate and install a new o-ring seal in the groove
in the housing.
12.Install the wear plate and align screw holes in the
wear plate with threaded holes in the housing.
NOTE: The holes in the wear plate are symmetrical.
13.Install the geroter drive, making sure the slot in the
drive engages the pin.

A. Put one of the bearing races and sleeve into the
housing.
B. Together, the housing and bearing race create a
groove into which the quad seal will be installed.
C. Hold the bearing race tightly against the input end
of the housing by pushing on the gerotor end of the
sleeve.

15.Install the gerotor and align the screw holes.
16.Lubricate and install new o-ring in gerotor ring
groove.
17.Lubricate and install new o-ring and seal ring in gerotor star groove.
18.Install the spacer.

D. Fit the quad seal into its seat through the input end
of the housing. Be sure the seal is not twisted.

19.Install the end cap and seven (7) cap screws. Tighten
the cap screws, in a crossing pattern, from 140 to 160
in-lb (16 to 18 N--m).

E. Remove the sleeve and bearing race.

20.Remove the steering control valve from the vise.

2. Lubricate and install the dust seal.
3. Install the centering springs in the spool. It is best to
install the two flat pieces first. Next, install the curved
pieces, three at a time.
4. Fit the retaining ring over the centering springs.

21.Install the relief valve and plug. Tighten the plug to
150 in-lb (17 N--m).

Thrust Bearing
and Race (2)

Dust Seal

5. Apply a light coating of clean hydraulic fluid to the
spool and slide it into the sleeve. Be sure the centering
springs fit into the notches in the sleeve.
Quad Seal

6. Install the pin.
7. Apply a light coating of petroleum jelly to the inner
edge of the dust and quad seals.

Groundsmaster 4000--D/4010--D

Page 4 -- 113

Figure 86

Hydraulic System

Hydraulic
System

14.Lubricate and install new o-ring in wear plate groove.

1. Install the quad seal:

Steering Cylinder
15
7

9
7

4
1

5
4
3

10
See text for
tightening
procedure

13
14
11

RIGHT

See text for
tightening
procedure

FRONT

Figure 87
1.
2.
3.
4.
5.
6.

Steering cylinder
Ball joint
Ball joint
Retaining ring
Grease fitting
Grease fitting

Hydraulic System

7.
8.
9.
10.
11.

90o hydraulic fitting
O--ring
O--ring
Drive axle assembly
Ball joint spacer

Page 4 -- 114

12.
13.
14.
15.
16.

Axle washer
Slotted hex nut
Cotter pin
Hydraulic hose
Hydraulic hose

Groundsmaster 4000--D/4010--D

Removal (Fig. 87)

Installation (Fig. 87)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

1. If removed, install ball joints into steering cylinder.

3. To prevent contamination of hydraulic system during
cylinder removal, thoroughly clean exterior of cylinder
and fittings.
NOTE: To ease installation, tag the hydraulic hoses to
show their correct position on the steering cylinder.
4. Remove hydraulic hoses from steering cylinder.
5. Remove cotter pins, slotted hex nuts, axle washer
and ball joint spacer from the threaded ends of ball
joints. Remove steering cylinder with ball joints from machine.
6. If hydraulic fittings are to be removed from steering
cylinder, mark fitting orientation to allow correct assembly. Remove fittings from cylinder and discard O--rings.
7. If needed, remove ball joints from steering cylinder.

Groundsmaster 4000--D/4010--D

3. Slide ram end ball joint through hole on steering arm.
Secure with axle washer and hex slotted nut. Slide fixed
end of cylinder through hole on axle. Secure with slotted
hex nut. Torque slotted hex nuts to 100 ft--lbs (135 N--m)
and then continue tightening the nut until hex nut groove
aligns with cotter pin hole in ball joint. Install cotter pin
to nut and ball joint.
4. Install hydraulic hoses to steering cylinder (see Hydraulic Hose and Tube Installation in the General Information section of this chapter).
5. Fill reservoir with new hydraulic fluid as required.
6. Properly fill hydraulic system (see Charge Hydraulic
System in this section).
7. After assembly is completed, operate steering cylinder to verify that hydraulic hoses and fittings are not contacted by anything.

Page 4 -- 115

Hydraulic System

Hydraulic
System

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

2. If fittings were removed from steering cylinder, lubricate and place new O--rings onto fittings. Install fittings
into port openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Information section of this chapter).

Steering Cylinder Service

12
9
11
10

7
8
5
4

1
6
3

45 to 55 ft--lb
(62 to 74 N--m)

Figure 88
1.
2.
3.
4.

Tube assembly
Rod
Piston assembly
Head

Hydraulic System

5.
6.
7.
8.

Retaining ring
Backup ring
O--ring
Cap seal

Page 4 -- 116

9.
10.
11.
12.

Rod seal
O--ring
O--ring
Wiper

Groundsmaster 4000--D/4010--D

Disassembly (Fig. 88)

Assembly (Fig. 88)

1. Pump oil out of cylinder into a drain pan by SLOWLY
moving rod and piston in and out of cylinder bore. Plug
ports and clean outside of cylinder.

1. Use a complete repair kit when rebuilding the cylinder. Put a coating of clean hydraulic oil on all new seals
and O--rings.

IMPORTANT: To prevent damage when clamping
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.

2. Install new O--rings and seals to the piston and head.

3. Loosen head from tube:
A. Use a spanner wrench to rotate head clockwise
until the edge of the retaining ring appears in the tube
opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotate the head counter--clockwise to remove retaining ring from tube and head.
4. Grasp end of piston rod and use a twisting and pulling motion to carefully extract piston, piston rod and
head from cylinder tube.
IMPORTANT: Do not clamp vise jaws against piston
rod surface; the piston rod will be damaged.
5. Securely mount piston, piston rod and head assembly into vise with soft jaws.
6. Remove set screws that secure piston to piston rod.
Remove piston from piston rod and then slide head from
rod.

4. Install and tighten piston onto shaft. Torque piston
from 45 to 55 ft--lb (62 to 74 N--m).
5. Apply Loctite #242 (or equivalent) to set screws and
install set screws into piston. Torque set screws from 5
to 7 ft--lb (7 to 9 N--m).
6. Put a coating of clean hydraulic oil on all cylinder
parts to ease assembly.
7. Slide rod assembly into cylinder tube.
IMPORTANT: To prevent damage when clamping
cylinder in a vise, clamp only on pivotal ends. Use
of a vise with soft jaws is recommended.
8. Mount steering cylinder in a vise with soft jaws. Secure head in barrel:
A. Align retaining ring hole in the head with the access slot in the tube.
B. Insert the retaining ring hook into the hole and rotate head clockwise until the retaining ring is completely pulled into the tube and the ring ends are
covered.
C. Apply silicone sealer to tube access slot.

7. Remove and discard all seals and O--rings from
head and piston.

CAUTION
Use eye protection such as goggles when using
compressed air to dry cylinder components.
8. Wash parts in clean solvent. Dry parts with compressed air. Do not wipe parts dry with paper towels or
cloth. Lint in a hydraulic system will cause damage.
9. Carefully inspect internal surface of barrel for damage (deep scratches, out--of--round, etc.). Replace entire cylinder if barrel is damaged. Inspect rod and piston
for evidence of excessive scoring, pitting or wear. Replace any damaged parts.
Groundsmaster 4000--D/4010--D

Page 4 -- 117

Hydraulic System

Hydraulic
System

2. Mount cylinder in a vise so rod end of cylinder is tilted
up slightly. Do not close vise so firmly that cylinder tube
could become distorted.

3. Lubricate shaft with clean hydraulic oil. Slide head
onto shaft.

Engine Cooling Fan Motor
4

27 to 33 ft--lb
(37 to 44 N--m)

7
8

4
5
19

16 17

12
11
12 to 14 ft--lb
(17 to 18 N--m)
Loctite #242
10

RIGHT
FRONT

Figure 89
1.
2.
3.
4.
5.
6.
7.

Hydraulic fan motor
O--ring
Bracket
45o hydraulic fitting
O--ring
Hydraulic hose
Fan hub

8.
9.
10.
11.
12.
13.
14.

Washer
Hex nut
Engine
Cap screw (4 used)
Washer (4 used)
Fan
Lock nut (2 used)

15.
16.
17.
18.
19.
20.
21.

Removal (Fig. 89)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
3. Unlatch and raise hood.

Hydraulic System

Hydraulic hose
O--ring
Hydraulic fitting
O--ring
Hydraulic hose
Cap screw (2 used)
Flat washer (2 used)

CAUTION
The radiator and oil cooler may be hot. To avoid
possible burns, allow the engine and cooling
systems to cool before removing fan motor.
4. Remove air cleaner hose and upper radiator shroud
to allow easier access to hydraulic fan motor (Fig. 90).

Page 4 -- 118

Groundsmaster 4000--D/4010--D

IMPORTANT: Make sure to not damage the radiator
or other machine components while loosening and
removing the fan motor and bracket assembly.
6. Remove cooling fan motor and bracket assembly.
A. To prevent contamination of hydraulic system,
thoroughly clean exterior of fan motor and fittings.
B. Disconnect hydraulic hoses from fan motor. Put
caps or plugs on fittings and hoses to prevent contamination. Label hydraulic lines for proper assembly.

IMPORTANT: Make sure to not damage the radiator
or other machine components while installing the
fan motor and bracket assembly.
5. Carefully position fan motor and bracket assembly to
radiator and secure with six (6) cap screws and flange
nuts.
6. Remove caps and plugs placed in hoses and fittings
during removal to prevent contamination. Connect hydraulic hoses to cooling fan motor (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).

C. Remove six (6) cap screws and flange nuts that
secure fan motor bracket to radiator.

7. Apply Loctite #242 (or equivalent) to threads of cap
screws (item 11) used to secure fan to fan hub. Position
fan to fan hub and secure with four (4) cap screws and
washers. Torque screws from 12 to 14 ft--lb (17 to 18
N--m).

D. Carefully remove fan motor and bracket assembly from machine and place on suitable work surface.

8. Install upper radiator shroud and air cleaner hose
(Fig. 90). Make sure that clearance between shroud and
cooling fan is at least 0.180” (4.6 mm) at all points.

7. Remove hex nut (item 9) and washer (item 8) that secure fan hub to fan motor. Use suitable puller to carefully
remove fan hub from fan motor shaft. Locate and retrieve woodruff key.
8. Remove two (2) cap screws (item 20), flat washers
(item 21) and lock nuts (item 14) that secure fan motor
to fan motor bracket. Remove fan motor from bracket.

9. Lower and secure hood.
10.Make sure hydraulic tank is full.
11. Properly fill hydraulic system (see Charge Hydraulic
System in this section).
1

9. If hydraulic fittings are to be removed from fan motor,
mark fitting orientation to allow correct assembly. Remove fittings from motor and discard O--rings.

2
3

Installation (Fig. 89)

1. If fittings were removed from fan motor, lubricate and
place new O--rings onto fittings. Install fittings into port
openings using marks made during the removal process
to properly orientate fittings. Tighten fittings (see Hydraulic Fitting Installation in the General Information
section of this chapter).

2. Position fan motor to fan motor bracket and secure
with cap screws (item 20), flat washers (item 21) and
lock nuts (item 14).
3. Thoroughly clean tapered surfaces of fan motor
shaft and fan hub. Place woodruff key in slot in motor
shaft.
4. Position fan hub onto motor shaft and secure with
washer (item 8) and hex nut (item 9). Torque nut from 27
to 33 ft--lb (37 to 44 N--m).

Groundsmaster 4000--D/4010--D

4
4

Figure 90
1.
2.
3.
4.

Page 4 -- 119

Radiator
Upper radiator shroud
Screw (4 used)
Flat washer

5. Air cleaner hose
6. Flange nut (4 used)
7. Cap screw

Hydraulic System

Hydraulic
System

5. Remove four (4) cap screws (item 11) and washers
used to secure fan to fan hub. Remove fan.

Engine Cooling Fan Motor Service
11
10
15
6

16
9

8
12

8
5
4

33 ft--lb
(45 N--m)

Figure 91
1.
2.
3.
4.
5.
6.

Flange washer
O--ring
Front flange
Dust seal
Retaining ring
Front wear plate

7.
8.
9.
10.
11.

Shaft seal
Backup gasket
Pressure seal
Rear wear plate
Body

12.
13.
14.
15.
16.

Idler gear
Cap screw (4 used)
Dowel (2 used)
Drive gear
Washer (4 used)

Disassembly (Fig. 91)
MARKER LINE

1. Plug motor ports and clean the outside of the motor
thoroughly. After cleaning, remove plugs and drain any
oil out of the motor.
2. Use a marker to make a diagonal line across the
front flange and body for assembly purposes (Fig. 92).
IMPORTANT: Prevent damage when clamping the
fan motor into a vise; clamp on the front flange only.
Also, use a vise with soft jaws.
3. Clamp front flange of motor in a vise with soft jaws
with the shaft end down.

Figure 92

4. Loosen cap screws from the rear cover.
5. Remove motor from the vise. Turn motor so that the
shaft end is facing down. Remove cap screws.
6. Carefully remove body. Lift body straight up to remove. Make sure the rear wear plate remains on the
drive and idler gear shafts. Remove and discard O-rings from the body. Locate and retrieve dowel pins.
Hydraulic System

IMPORTANT: Note position of the open and closed
side of the wear plates before removing. Also, identify wear plates (front and rear) with a marker for
proper assembly.
7. Carefully remove rear wear plate, idler gear, drive
gear and front wear plate from the front flange.

Page 4 -- 120

Groundsmaster 4000--D/4010--D

8. Remove and discard back--up gaskets and pressure
seals from wear plates.

9. Turn front flange over, with seal side up.
IMPORTANT: Make sure not to damage the front
flange counter bore when removing the seals from
the front flange.
10.Carefully remove dust seal, retaining ring, flange
washer and shaft seal from the front flange (Fig. 93).
Note orientation of seal lips during removal. Discard removed seals.
Inspection
1. Remove any nicks and burrs from all parts with
emery cloth.

Figure 93
1. Dust seal
2. Retaining ring

3. Flange washer
4. Shaft seal

CAUTION

2. Clean all parts with solvent. Dry all parts with compressed air.

3. Inspect drive gears and idler gears for the following
(Fig. 94):
A. Gear shafts should be free of rough surfaces and
excessive wear at bushing points and sealing areas.
Scoring, rough surfaces or wear on gear shafts indicates need for replacement.
B. Gear teeth should be free of excessive scoring
and wear. Any broken or nicked gear teeth must be
replaced.
C. Inspect gear face edge for sharpness. Sharp
edges of gears will mill into wear plates and, thus,
must be replaced.
4. Inspect wear plates for the following:
A. Bearing areas should not have excessive wear or
scoring.
B. Face of wear plates that are in contact with gears
should be free of wear, roughness or scoring.

2
4

Figure 94
1.
2.

Gear shaft spline
Gear shaft

3.
4.

Gear teeth
Gear face edge

Assembly (Fig. 91)
NOTE: When assembling motor, check the marker line
on each part to make sure parts are properly aligned
during assembly.
1. Lubricate O--rings, pressure seals, back--up gaskets
and wear plate grooves with a thin coat of petroleum jelly. Lubricate all other internal parts freely with clean hydraulic oil.
2. Install new seals into front flange (Fig. 93). Note orientation of seal lips during installation:
A. Press shaft seal into front flange until it reaches
the bottom of the bore.

C. Thickness of wear plates should be equal.
5. Inspect front flange and body for damage or wear.

B. Install flange washer into front flange and then
install retaining ring into the groove of the front
flange.
C. Install new dust seal into front flange.

Groundsmaster 4000--D/4010--D

Page 4 -- 121

Hydraulic System

Hydraulic
System

Use eye protection such as goggles when using
compressed air.

3. Place front flange, seal side down, on a flat surface.
4. Install the pressure seals, flat side outward, into the
grooves in the wear plates. Follow by carefully placing
the backup gaskets, flat side outward, between the
pressure seals and the grooves in the wear plate.
5. Apply a light coating of petroleum jelly to the exposed
side of the front flange.
6. Lubricate the drive gear shaft with clean hydraulic oil.
Insert the drive end of the drive shaft through the wear
plate with the pressure seal side down and the open side
of the pressure seal pointing to the inlet side of the motor. Carefully install shaft into front flange.
7. Lubricate the idler gear shaft with clean hydraulic oil.
Install idler gear shaft into the remaining position in the
front wear plate. Apply a light coating of clean hydraulic
oil to gear faces.
8. Install rear wear plate with pressure seal side up and
open side of the pressure seal pointing to the inlet side
of the motor.
9. Apply a light coating of petroleum jelly to new O-rings and O--ring grooves in the body. Install new O-rings to the body.

Hydraulic System

10.Install locating dowels in body. Align marker line on
the body and front flange.
IMPORTANT: Do not dislodge seals during installation.
11. Gently slide the body onto the assembly. Firm hand
pressure should be sufficient to engage the dowels.
12.Install the four (4) cap screws with washers and hand
tighten.
IMPORTANT: Prevent damage when clamping the
fan motor into a vise; clamp on the front flange only.
Also, use a vise with soft jaws.
13.Place front flange of the motor into a vise with soft
jaws and alternately torque the cap screws 33 ft--lb (45
N--m).
14.Remove motor from vise.
15.Place a small amount of clean hydraulic oil in the inlet
of the motor and rotate the drive shaft away from the inlet
one revolution. If any binding is noted, disassemble the
motor and check for assembly problems.

Page 4 -- 122

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 123

Hydraulic System

Fan Drive Manifold
4

10 5 26
7
27

7
11

23
7
22
7
21

14
20
19

7
18
17

12
13

RIGHT
FRONT

Figure 95
1.
2.
3.
4.
5.
6.
7.
8.
9.

Fan drive manifold
O--ring
Test fitting
Dust cap (2 used)
O--ring
45o hydraulic fitting (2 used)
O--ring
Hydraulic hose
Hydraulic hose

10.
11.
12.
13.
14.
15.
16.
17.
18.

Hydraulic fitting
Hydraulic hose
Hydraulic hose
90o hydraulic fitting
90o hydraulic fitting (2 used)
Cap screw (2 used)
Lock washer (2 used)
Hydraulic hose
O--ring

19.
20.
21.
22.
23.
24.
25.
26.
27.

90o hydraulic fitting
Hydraulic hose
Hydraulic hose
Hydraulic tee fitting
Hydraulic test fitting
Oil filter assembly
Cap screw (2 used)
Flat washer (2 used)
Manifold mount

NOTE: The ports on the manifold are marked for easy
identification of components. Example: P1 and P2 are
gear pump connection ports and S1 is the solenoid valve
port (see Hydraulic Schematic in Chapter 10 -- Foldout
Drawings to identify the function of the hydraulic lines
and cartridge valves at each port).
Hydraulic System

Page 4 -- 124

Groundsmaster 4000--D/4010--D

Removal (Fig. 95)

Installation (Fig. 95)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

2. Raise and support operator seat to allow access to
fan drive manifold (Fig. 96).
3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
4. To prevent contamination of hydraulic system during
manifold removal, thoroughly clean exterior of fan drive
manifold and fittings.
5. Label wire harness electrical connectors that attach
to manifold solenoid valve coils. Disconnect wire harness connectors from the solenoid coils.
6. Disconnect hydraulic lines from fan drive manifold
and put caps or plugs on open hydraulic lines and fittings. Label disconnected hydraulic lines for proper reassembly.

2. Install fan drive manifold to the frame using Figure 95
as a guide.
3. Remove caps and plugs from fittings and hoses. Using labels placed during manifold removal, properly connect hydraulic lines to manifold (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
4. Connect wire harness connectors to the solenoid
valve coils on the fan drive manifold.
5. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.
6. Lower and secure operator seat.

Hydraulic
System

7. Remove fan drive manifold from the frame using Figure 95 as a guide.
1

8. If hydraulic fittings are to be removed from manifold,
mark fitting orientation to allow correct assembly. Remove fittings from manifold and discard O--rings.

2
Figure 96
1. Fan drive manifold
2. Hydraulic reservoir

Groundsmaster 4000--D/4010--D

Page 4 -- 125

3. Operator seat latch

Hydraulic System

Fan Drive Manifold Service
5 ft--lb
(6.7 N--m)

5 ft--lb
(6.7 N--m)

UP
FRONT

25 ft--lb
(34 N--m)

50 ft--lb
(67 N--m)

7
7

5
20 ft--lb
(27 N--m)

1
25 ft--lb
(34 N--m)

4
2

25 ft--lb
(34 N--m)

2
4

25 ft--lb
(34 N--m)
20 ft--lb
(27 N--m)

FRONT
20 ft--lb
(27 N--m)

Figure 97
1.
2.
3.
4.

Fan drive manifold body
#4 zero leak plug with O--ring (3 used)
Check valve (port CV)
#6 zero leak plug with O--ring (2 used)

5. Flow divider valve (port FD)
6. Nut
7. Solenoid coil (2 used)

Hydraulic System

8. Proportional relief valve (port TS)
9. Solenoid valve (port S1)
10. Nut

NOTE: The fan drive manifold uses several zero leak
plugs. These plugs have a tapered sealing surface on
the plug head that is designed to resist vibration induced
plug loosening. The zero leak plugs also have an O--ring
as a secondary seal. If zero leak plug removal is necessary, lightly rap the plug head using a punch and hammer before using an allen wrench to remove the plug:
the impact will allow plug removal with less chance of
damage to the socket head of the plug.

Page 4 -- 126

Groundsmaster 4000--D/4010--D

Fan Drive Manifold Service (Fig. 97)

Hydraulic
System

For fan drive manifold cartridge valve service procedures, see 4WD Manifold Service in this section. Refer
to Figure 97 for fan drive manifold cartridge valve and
plug installation torque.

Groundsmaster 4000--D/4010--D

Page 4 -- 127

Hydraulic System

PTO Circuit

RIGHT
9

FRONT

2
4

Figure 98
1. Gear pump
2. RH cutting deck motor
3. LH cutting deck motor

4. RH PTO manifold
5. Front cutting deck motor
6. LH PTO manifold

7. Front PTO manifold
8. Filter manifold
9. Oil cooler

Figure 98 illustrates the components that are used in the
Groundsmaster 4000--D and 4010--D PTO circuit. Procedures for removal, installation and disassembly/assembly of these components are provided on the
following pages of this section.

Hydraulic System

Page 4 -- 128

Groundsmaster 4000--D/4010--D

Cutting Deck Motor

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
3. Thoroughly clean exterior of deck motor and fittings.
Disconnect hydraulic lines from motor. Put caps or plugs
on fittings and hoses to prevent contamination. Tag hydraulic lines for proper installation.

5. Secure motor to cutting deck with two (2) flange head
screws (Fig. 99).
6. Remove caps or plugs from fittings and hoses. Connect hydraulic hoses to deck motor (see Hydraulic Hose
and Tube Installation in the General Information section
of this chapter).
7. After assembly is completed, verify that hydraulic
hoses and fittings are not contacted by moving components.

4. Remove two (2) flange head screws that secure hydraulic motor to motor mount (Fig. 99).

5. Carefully remove hydraulic motor from cutting deck
taking care not to damage spider hub attached to motor.
Locate and remove spider and mounting shim(s) (if
equipped) from the deck.

2
2

6. If necessary, straighten tab washer and remove nut,
tab washer and spider hub from motor shaft.
7. If hydraulic fittings are to be removed from motor,
mark fitting orientation to allow correct assembly. Remove fittings from motor and discard O--rings.

Figure 99
1. Deck motor (RH shown)

Installation

9
27 to 33 ft--lb
(37 to 44 N--m)

10
15

14
12

3. Check for proper clearance between spider hub and
spindle pulley. Install motor to cutting deck without placing the spider in the spindle pulley. The clearance between hub and pulley valleys should be from 0.830” to
0.930” (21.1 to 23.6 mm). If required, use mounting
shim(s) between motor and motor mount to adjust clearance.

Groundsmaster 4000--D/4010--D

2
4

2. If removed, install spider hub on motor shaft. Secure
with tab washer and nut. Torque nut from 27 to 33 ft--lb
(37 to 44 N--m). Bend small tab of washer into keyway
and large tab against nut.

4. Position spider in spindle pulley. Place mounting
shim(s) (if required) on deck. Carefully install hydraulic
motor to the cutting deck taking care not to damage spider hub attached to motor.

2. Flange head screw

Figure 100
1.
2.
3.
4.
5.
6.
7.
8.

Page 4 -- 129

Cutting deck motor
O--ring
Hydraulic adapter
O--ring
Flange head screw
O--ring
Hydraulic adapter
O--ring

9.
10.
11.
12.
13.
14.
15.

90o hydraulic fitting
Woodruff key
Shim (if required)
Spider
Nut
Tab washer
Spider hub

Hydraulic System

Hydraulic
System

Removal

Cutting Deck Motor Service

9
15

10
15

13
9
8

7
15

33 to 40 ft--lb
(45 to 55 N--m)

Figure 101
1.
2.
3.
4.
5.

Rear cover
Drive gear
Seal
Woodruff key
Nut

6.
7.
8.
9.
10.

Tab washer
Spider hub
Pressure seal
Back--up ring
O--ring

11.
12.
13.
14.
15.

Body
Idler gear
Cap screw (4 used)
Front flange
Dowel pin

Disassembly (Fig. 101)
1. Plug motor ports and clean the outside of the motor
thoroughly. After cleaning, remove plugs and drain any
oil out of the motor.
2. Use a marker or scribe to make a diagonal mark
across the front flange, body and rear cover for reassembly purposes (Fig. 102).

DIAGONAL
MARK

IMPORTANT: Prevent damage when clamping the
deck motor into a vise; clamp on the front flange
only. Also, use a vise with soft jaws.
3. Clamp mounting flange of motor in a vise with the
shaft end down.

Figure 102

4. Loosen cap screws on the rear cover.
5. Take motor from the vise and remove cap screws.
6. Remove front flange from the body, then remove rear
cover. Locate and remove dowel pins from body.
Hydraulic System

Page 4 -- 130

Groundsmaster 4000--D/4010--D

IMPORTANT: Mark the relative positions of the gear
teeth and the bearing blocks so they can be reassembled in the same position. Do not touch the
gear surfaces as residue on hands may be corrosive
to gear finish.

7. Place the motor on its side and push on the rear bearing block to remove the bearing block and gear set (Fig.
103).
8. Carefully remove and discard O--rings, pressure
seals and back--up rings (Fig. 104) from motor. Do not
cause any damage to the machined grooves during the
removal process.
IMPORTANT: Make sure not to damage the counter
bore when removing the shaft seal from the front
plate.

2
Figure 103
1. Motor body

2. Bearing block & gear set

9. Position front flange with seal side up. Carefully remove shaft seal taking care to not damage seal bore.
Inspection

Hydraulic
System

1. Remove any nicks and burrs from all motor components with emery cloth.

CAUTION
Use eye protection such as goggles when using
compressed air.
Figure 104

2. Clean all motor components with solvent. Dry all
parts with compressed air.
3. Inspect drive gear, idler gear and bearing blocks
(Fig. 105) for the following:
A. Gear shafts should be free of rough surfaces and
excessive wear at bushing points and sealing areas.
Scoring, rough surfaces or wear on gear shafts indicates need for replacement.

B. Gear teeth should be free of excessive scoring
and wear. Any broken or nicked gear teeth must be
replaced.

C. Inspect gear face edge for sharpness. Sharp
edges of gears will mill into bearing blocks and, thus,
must be replaced.
D. Bearing areas of bearing blocks should not have
excessive wear or scoring.
3

E. Face of bearing blocks that are in contact with
gears should be free of wear, roughness or scoring.
4. Inspect front flange, body and rear cover for damage
or wear.
Groundsmaster 4000--D/4010--D

Figure 105
1. Drive gear
2. Idler gear

Page 4 -- 131

3. Bearing block

Hydraulic System

Assembly (Fig. 101)

8. Install dowel pins in body.

NOTE: When assembling the motor, check the identification marks made during disassembly to make sure
the parts are properly aligned during assembly.

IMPORTANT: Do not dislodge O--rings, pressure
seals or back--up rings during final assembly.

1. Lubricate O--rings, pressure seals, back--up gaskets
and seal grooves with a thin coat of petroleum jelly. Lubricate all other internal parts freely with clean hydraulic
oil.
2. Install new shaft seal into front flange.
3. Install lubricated pressure seals into the grooves in
the front flange and rear cover. Follow by carefully placing the back--up rings into the grooves.
4. Install new O--rings to the body.
5. Lubricate gear faces and bearing surfaces of drive
gear, idler gear and bearing blocks. Carefully assemble
bearing blocks and gears noting identification marks
made during disassembly.
6. Position the motor body on its side. Carefully slide
bearing block and gear assembly into the body cavity
using identification marks made during disassembly.
7. Remove any excess lubrication from mating surfaces of body, rear cover and front flange. Make sure
that these surfaces are clean and dry.

Hydraulic System

9. Gently slide the rear cover onto the assembly using
marker or scribe mark for proper location. Firm hand
pressure should be sufficient to engage the dowel pins.
10.Position the motor with rear cover downwards. Carefully slide the front flange onto the assembly using marker or scribe mark for proper location.
11. Install the four (4) cap screws and hand tighten.
IMPORTANT: Prevent damage when clamping the
deck motor into a vise; clamp on the front flange
only. Also, use a vise with soft jaws.
12.Place motor front flange in a vise and alternately
torque the screws from 33 to 40 ft--lb (45 to 55 N--m).
13.Put a small amount of hydraulic oil in port on motor
and rotate driveshaft one revolution. Protect the shaft if
using a pliers. If drive shaft binds, disassemble motor
and repeat assembly process.
14.Remove motor from vise.

Page 4 -- 132

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 133

Hydraulic System

PTO Manifold

2 4

11
24

26 25 21

11
5

8
27

6
14

12 2

19 18

10
21

4
21 20 19 18 23

RIGHT
FRONT

Figure 106
1.
2.
3.
4.
5.
6.
7.
8.
9.

Hydraulic PTO manifold (front deck)
Quick fitting (1 used per manifold)
Flange nut
O--ring
Hydraulic fitting
O--ring
O--ring
O--ring
Hydraulic adapter

10.
11.
12.
13.
14.
15.
16.
17.
18.

Straight fitting
Cap screw (2 used per manifold)
Dust cap
Hydraulic adapter
Hydraulic PTO manifold (LH deck)
Hydraulic fitting
Hydraulic PTO manifold (RH deck)
90o hydraulic fitting
Hydraulic adapter

19.
20.
21.
22.
23.
24.
25.
26.
27.

O--ring
90o hydraulic fitting
O--ring
R--clamp
O--ring
Hydraulic tee fitting
O--ring
Hydraulic fitting
45o hydraulic fitting

NOTE: The ports on the manifold are marked for easy
identification of components. Example: S is the deck solenoid valve and P1 is a gear pump connection port (see
Hydraulic Schematic in Chapter 10 -- Foldout Drawings
to identify the function of the hydraulic lines and cartridge valves at each port).

Hydraulic System

Page 4 -- 134

Groundsmaster 4000--D/4010--D

Removal (Fig. 106)

Installation (Fig. 106)

1. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.

3. Disconnect wire harness connector from the solenoid valve coil on the PTO manifold.
4. Disconnect hydraulic lines from manifold and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper installation.
5. Remove PTO manifold from the frame using Figure
106 as a guide.
NOTE: The upper cap screw on the right side PTO
manifold also secures the ground cable and has a lock
washer to ensure a good grounding path. Make sure
that lock washer is retrieved when removing RH PTO
manifold from frame.
6. If hydraulic fittings are to be removed from manifold,
mark fitting orientation to allow correct assembly. Remove fittings from manifold and discard O--rings.

Groundsmaster 4000--D/4010--D

2. Install PTO manifold to the frame using Figure 106
as a guide.
NOTE: Make sure that lock washer and ground cable
are positioned under upper cap screw head when installing RH PTO manifold.
3. Remove caps and plugs from fittings and hoses. Using labels placed during manifold removal, properly connect hydraulic lines to manifold (see Hydraulic Hose and
Tube Installation in the General Information section of
this chapter).
4. Connect wire harness connector to the solenoid
valve coil on the PTO manifold.
5. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.

Page 4 -- 135

Hydraulic
System

2. To prevent contamination of hydraulic system during
manifold removal, thoroughly clean exterior of PTO
manifold and fittings.

Hydraulic System

PTO Manifold Service
20 ft--lb
(27 N--m)

5 ft--lb
(6.7 N--m)
7

9
25 ft--lb
(34 N--m)

20 ft--lb
(27 N--m)

25 ft--lb
(34 N--m)

20 ft--lb
(27 N--m)
1

50 ft--lb
(67 N--m)
20 ft--lb
(27 N--m)

4
2

RH DECK PTO MANIFOLD SHOWN

Figure 107
1.
2.
3.
4.

PTO manifold body
NWD SAE #4 plug with O--ring
Orifice (0.063) (port OR)
#8 zero leak plug with O--ring

5.
6.
7.
8.

Relief valve (port RV2)
Solenoid valve (port S)
Solenoid coil
Nut

NOTE: The ports on the manifold are marked for easy
identification of components. Example: S is the deck solenoid valve and P1 is the gear pump connection port
(see Hydraulic Schematic in Chapter 10 -- Foldout
Drawings to identify the function of the hydraulic lines
and cartridge valves at each port location).
The manifolds for the three (3) cutting decks are very
similar. The front deck manifold does not include an orifice (item 3). Note: When servicing the PTO manifolds,
DO NOT interchange parts from one manifold to another.

Hydraulic System

9. Relief valve (port RV1)
10. Spool logic cartridge (port LC2)
11. Spool logic cartridge (port LC1)

NOTE: The PTO manifold assembly includes zero leak
plugs. These plugs have a tapered sealing surface on
the plug head that is designed to resist vibration induced
plug loosening. The zero leak plugs also have an O--ring
as a secondary seal. If zero leak plug removal is necessary, lightly rap the plug head using a punch and hammer before using an allen wrench to remove the plug:
the impact will allow plug removal with less chance of
damage to the socket head of the plug.

Page 4 -- 136

Groundsmaster 4000--D/4010--D

PTO Manifold Service (Fig. 107)

Hydraulic
System

For PTO manifold solenoid and control valve service
procedures, see 4WD Manifold Service in this section.
Refer to Figure 107 for PTO manifold cartridge valve
and plug installation torque.

Groundsmaster 4000--D/4010--D

Page 4 -- 137

Hydraulic System

Cutting Deck Lift/Lower Circuit

RIGHT

FRONT
4
3
1

Figure 108
1. Front lift cylinder (2 used)
2. RH lift cylinder

3. LH lift cylinder
4. Fan drive manifold

Figure 108 illustrates the components that are used in
the Groundsmaster 4000--D and 4010--D cutting deck
lift and lower circuits. Procedures for removal, installation and disassembly/assembly of these components
are provided on the following pages of this section.

Hydraulic System

5. Lift/lower manifold
6. Oil filter

WARNING
Make sure that cutting decks are fully lowered
before loosening any hydraulic lines, cartridge
valves or plugs from lift circuit components. If
decks are not fully lowered as components are
loosened, decks may drop unexpectedly.

Page 4 -- 138

Groundsmaster 4000--D/4010--D

Hydraulic
System

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 4 -- 139

Hydraulic System

Lift/Lower Manifold

RIGHT
FRONT
1

Figure 109
1. Lift/lower manifold
2. Flange head screw (2 used)

3. Washer head screw (2 used)

4. Splash shield

Removal (Fig. 109)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch. Raise and support operator
seat.
2. Remove controller cover and then support bracket
from the right side of the operator seat (Fig. 110).
3. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
4. To prevent contamination of hydraulic system during
lift/lower manifold removal, thoroughly clean exterior of
manifold including fittings and hydraulic lines.

Hydraulic System

WARNING
Make sure that cutting decks are fully lowered
before loosening hydraulic lines, cartridge
valves or plugs from lift/lower manifold. If decks
are not fully lowered as manifold components
are loosened, decks may drop unexpectedly.
5. Label wire harness electrical connectors that attach
to manifold solenoid valve coils. Disconnect wire harness connectors from the solenoid valve coils on lift/lower manifold.

Page 4 -- 140

Groundsmaster 4000--D/4010--D

6. Disconnect hydraulic lines from manifold and put
caps or plugs on open hydraulic lines and fittings. Label
disconnected hydraulic lines for proper installation.

7. Remove lift/lower manifold using Figure 109 as a
guide.
4

IMPORTANT: The fitting in manifold port C2 includes a .070 orifice to control the lowering speed
of the front deck. If this fitting is removed from the
manifold, label its position for assembly purposes.
8. If hydraulic fittings are to be removed from control
manifold, mark fitting orientation to allow correct assembly. Remove fittings from valve and discard O--rings
(Fig. 111).

Figure 110
1. Controller cover
2. Screw (2 used)

3. Flat washer (2 used)
4. U--nut (2 used)

FRONT

25 ft--lb
(34 N--m)

Installation (Fig. 109)
1. If fittings were removed from control manifold, lubricate and place new O--rings onto fittings. Correctly
place orifice in port C2, C4 or C6 if removed. Install fittings into port openings using marks made during the removal process to properly orientate fittings (Fig. 111).
Tighten fittings (see Hydraulic Fitting Installation in the
General Information section of this chapter).

3
6 7

2. Install lift/lower manifold using Figure 109 as a guide.

3. Remove caps and plugs from fittings and hydraulic
lines. Using labels placed during manifold removal,
properly connect hydraulic lines to manifold (see Hydraulic Hose and Tube Installation in the General Information section of this chapter).
4. Using tags placed during manifold removal, correctly
connect wire harness connectors to the solenoid valve
coils on the lift/lower manifold.
5. Install support bracket and controller cover to the
right side of the operator seat (Fig. 110).

4
25 ft--lb
(34 N--m)

Figure 111
1.
2.
3.
4.
5.
6.
7.

O--ring
Dust cap
Test port
Orifice (.063)
Straight fitting
O--ring
Orifice (.035)

8.
9.
10.
11.
12.
13.

O--ring
O--ring
45o hydraulic fitting
45o hydraulic fitting
O--ring
Fitting with orifice (.070)

6. Make sure hydraulic tank is full. Add correct oil if necessary before returning machine to service.
7. Lower and secure operator seat.

Groundsmaster 4000--D/4010--D

Page 4 -- 141

Hydraulic System

Hydraulic
System

IMPORTANT: A flow control orifice is placed beneath the hydraulic fittings in lift/lower manifold
ports C2, C4 and C6. If any of these fittings is removed from the manifold, make sure to remove orifice and label its position for assembly purposes.
Also note location of groove in orifice for assembly
purposes. When installing the orifice in the manifold, make sure that the orifice is flat in the base of
the port. Manifold damage is possible if the orifice
is cocked in the port.

Lift/Lower Manifold Service
25 ft--lb
(34 N--m)
5 ft--lb
(6.7 N--m)

20 ft--lb
(27 N--m)

5 ft--lb
(6.7 N--m)

8
4
3

9
3

UP
10

2
12

10
20 ft--lb
(27 N--m)
20 ft--lb
(27 N--m)

25 ft--lb
(34 N--m)

1
20 ft--lb
(27 N--m)
2
11
11

20 ft--lb
(27 N--m)

Figure 112
1.
2.
3.
4.

Lift/lower manifold body
Solenoid valve (S4, S6 & S9)
Solenoid coil (5 used)
Nut (8 used)

5.
6.
7.
8.

Relief valve (RV2)
Relief valve (RV1)
Solenoid valve (S1)
Nut

NOTE: The ports on the lift/lower manifold are marked
for easy identification of components. Example: S1 is
solenoid valve S1 and P is the gear pump connection
port (see Hydraulic Schematic in Chapter 10 -- Foldout
Drawings to identify the function of the hydraulic lines
and cartridge valves at each port location).

Hydraulic System

9.
10.
11.
12.

Solenoid coil (4 used)
Solenoid valve (S2, S3, S7 & S8)
#4 zero leak plug with O--ring
Solenoid valve (S5)

NOTE: The lift/lower manifold assembly includes several zero leak plugs. These plugs have a tapered sealing
surface on the plug head that is designed to resist vibration induced plug loosening. The zero leak plugs also
have an O--ring as a secondary seal. If zero leak plug removal is necessary, lightly rap the plug head using a
punch and hammer before using an allen wrench to remove the plug: the impact will allow plug removal with
less chance of damage to the socket head of the plug.

Page 4 -- 142

Groundsmaster 4000--D/4010--D

Lift/Lower Manifold Service (Fig. 112)

WARNING
If lift/lower manifold is attached to machine,
make sure that cutting decks are fully lowered
before loosening hydraulic lines, cartridge
valves or plugs from lift/lower manifold. If decks
are not fully lowered when manifold components
are loosened, decks may drop unexpectedly.

Hydraulic
System

For lift/lower manifold solenoid and control valve service
procedures, see 4WD Manifold Service in this section.
Refer to Figure 112 for lift/lower manifold cartridge valve
and plug installation torque.

Groundsmaster 4000--D/4010--D

Page 4 -- 143

Hydraulic System

Side Deck Lift Cylinder
12

9
10
6

4
3

RIGHT

2
1

FRONT

Figure 113
1.
2.
3.
4.

Lift arm assembly (LH shown)
Shoulder screw
Pin assembly
Lift cylinder

Hydraulic System

5.
6.
7.
8.

Flange locking nut
90o hydraulic fitting (2 used)
O--ring
O--ring

Page 4 -- 144

9.
10.
11.
12.

Cylinder pin
Spring pin
Lock nut
Flat washer

Groundsmaster 4000--D/4010--D

Removal (Fig. 113)

Installation (Fig. 113)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

1. If fittings were removed from lift cylinder, lubricate
and place new O--rings onto fittings. Install fittings into
port openings using marks made during the removal
process to properly orientate fittings. Tighten fittings
(see Hydraulic Fitting Installation in the General Information section of this chapter).

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
3. To prevent contamination of hydraulic system during
lift cylinder removal, thoroughly clean exterior of cylinder and fittings.

WARNING
Make sure that side cutting deck is fully lowered
before loosening hydraulic lines from side deck
lift cylinder. If deck is not fully lowered as hydraulic lines are loosened, deck may drop unexpectedly.
NOTE: To ease installation, tag the hydraulic hoses to
show their correct position on the lift cylinder.

2. Position cylinder barrel clevis to frame and insert cylinder pin through the frame and cylinder clevis. Secure
pin with flat washer and lock nut.
3. Insert pin assembly through the lift arm and cylinder
shaft clevis. Secure pin assembly to lift arm with shoulder screw and flange locking nut.
4. Attach hydraulic hoses to lift cylinder (see Hydraulic
Hose and Tube Installation in the General Information
section of this chapter).
5. Fill reservoir with hydraulic fluid as required.
6. After installation is completed, operate lift cylinder to
verify that hydraulic hoses and fittings are not contacted
by anything.
Hydraulic
System

4. Disconnect hydraulic hoses from lift cylinder.
5. Remove shoulder screw and flange locking nut that
secure the pin assembly to the lift arm. Remove pin assembly from lift arm and cylinder shaft clevis.
6. Remove lock nut and flat washer from the cylinder
pin. Remove cylinder pin with spring pin from the frame
and cylinder barrel clevis.
7. Remove lift cylinder from machine.
8. If hydraulic fittings are to be removed from lift cylinder, mark fitting orientation to allow correct assembly. Remove fittings from cylinder and discard O--rings.

Groundsmaster 4000--D/4010--D

Page 4 -- 145

Hydraulic System

Front Deck Lift Cylinder
10

RIGHT

FRONT

12
9

13
10
15
10

9
1

11
14

4
5
6
8

7
6

Figure 114
1.
2.
3.
4.
5.

Lift cylinder
Pivot pin
Cotter pin (2 used per pin)
Pin assembly
Cap screw

Hydraulic System

6.
7.
8.
9.
10.

Flat washer
Lock nut
LH lift arm assembly
O--ring
Straight hydraulic fitting

Page 4 -- 146

11.
12.
13.
14.
15.

O--ring
90o hydraulic fitting
RH lift arm assembly
Grease fitting
Grease fitting

Groundsmaster 4000--D/4010--D

Removal (Fig. 114)

Installation (Fig. 114)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

2. Read the General Precautions for Removing and
Installing Hydraulic System Components at the beginning of the Service and Repairs section of this chapter.
3. To prevent contamination of hydraulic system during
lift cylinder removal, thoroughly clean exterior of cylinder and fittings.

WARNING
Make sure that front cutting deck is fully lowered
before loosening hydraulic lines from front deck
lift cylinders. If deck is not fully lowered as hydraulic lines are loosened, deck may drop unexpectedly.
NOTE: To ease installation, tag the hydraulic hoses to
show their correct position on the lift cylinder.

2. Position cylinder barrel clevis to frame and insert pivot pin into frame and clevis. Secure pivot pin with cotter
pin.
3. Insert pin assembly through lift arm and cylinder
shaft clevis. Secure pin to lift arm with cap screw, two (2)
flat washers and lock nut.
4. Attach hydraulic hoses to lift cylinder (see Hydraulic
Hose and Tube Installation in the General Information
section of this chapter).
5. Fill reservoir with hydraulic fluid as required.
6. After assembly is completed, operate lift cylinder to
verify that hydraulic hoses and fittings are not contacted
by anything.
Hydraulic
System

4. Disconnect hydraulic hoses from lift cylinder.
5. Remove lock nut, two (2) flat washers and cap screw
that secure the pin assembly to the lift arm. Remove pin
assembly from lift arm and cylinder shaft clevis which
will free lift cylinder from lift arm.
6. Remove one cotter pin from pivot pin that secures
upper end of lift cylinder to machine. Pull pivot pin from
frame and cylinder barrel clevis.
7. Remove lift cylinder from machine.
8. If hydraulic fittings are to be removed from lift cylinder, mark fitting orientation to allow correct assembly. Remove fittings from cylinder and discard O--rings.

Groundsmaster 4000--D/4010--D

Page 4 -- 147

Hydraulic System

Lift Cylinder Service

100 to 120 ft--lb
(136 to 162 N--m)

1
13

12
11

SIDE DECK LIFT CYLINDER

Figure 115
1.
2.
3.
4.
5.
6.

Barrel with clevis
Retaining ring
Shaft with clevis
Dust seal
Rod seal
O--ring

7.
8.
9.
10.
11.

Back--up ring
Head
O--ring
Wear ring
Piston

12.
13.
14.
15.
16.

Lock nut
Grease fitting
Bushing
O--ring
Seal

30 to 35 ft--lb
(41 to 47 N--m)

11
13
8
4

1
2

FRONT DECK LIFT CYLINDER

Figure 116
1.
2.
3.
4.
5.

Barrel with clevis
Seal
Shaft with clevis
Dust seal
Rod seal

Hydraulic System

6.
7.
8.
9.

O--ring
Back--up ring
Head
O--ring

Page 4 -- 148

10.
11.
12.
13.

Wear ring
Piston
Lock nut
Retaining ring

Groundsmaster 4000--D/4010--D

Disassembly (Figs. 115 and 116)

Assembly (Figs. 115 and 116)

1. Remove oil from lift cylinder into a drain pan by slowly
pumping the cylinder shaft. Plug both ports and clean
the outside of the cylinder.

1. Make sure all cylinder components are clean before
assembly.

2. Mount lift cylinder securely in a vise by clamping on
the clevis end of the barrel. Use of a vise with soft jaws
is recommended.
3. Loosen head from barrel:
A. Use a spanner wrench to rotate head clockwise
until the edge of the retaining ring appears in the barrel opening.
B. Insert a screwdriver under the beveled edge of
the retaining ring to start the retaining ring through
the opening.
C. Rotate the head counter--clockwise to remove retaining ring from barrel and head.
4. Extract shaft with head and piston by carefully twisting and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface.
5. Mount shaft securely in a vise by clamping on the clevis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
6. Remove and discard all seals and O--rings from the
piston and the head.
7. Wash parts in clean solvent. Dry parts with compressed air. Do not wipe parts dry with paper towels or
cloth. Lint in a hydraulic system will cause damage.
8. Carefully inspect internal surface of barrel for damage (deep scratches, out--of--round, etc.). Inspect piston
rod and piston for evidence of excessive scoring, pitting
or wear. Replace lift cylinder if internal components are
found to be worn or damaged.

Groundsmaster 4000--D/4010--D

2. Coat new seal kit components with clean hydraulic
oil.
A. Install new seals and O--rings to the piston.
B. Install new seals, O--ring and back--up ring to the
head.
IMPORTANT: Do not clamp vise jaws against the
shaft surface.
3. Mount shaft securely in a vise by clamping on the clevis of the shaft.
A. Coat shaft with clean hydraulic oil.
B. Carefully slide head and piston onto the shaft.
Secure piston to shaft with lock nut.
C. Torque lock nut to specification in Figure 115
(side deck cylinder) or Figure 116 (front deck cylinder).
4. Lubricate head and piston with clean hydraulic oil.
Carefully slide shaft assembly into cylinder barrel.
IMPORTANT: Prevent damage when clamping the
cylinder’s barrel into a vise; clamp on the clevis
only.
5. Mount lift cylinder in a vise with soft jaws. Secure
head in barrel:
A. Align retaining ring hole in the head with the access slot in the barrel.
B. Insert the retaining ring hook into the hole and rotate head clockwise until the retaining ring is completely pulled into the barrel and the ring ends are
covered.
C. Apply silicone sealer to barrel access slot.

Page 4 -- 149

Hydraulic System

Hydraulic
System

IMPORTANT: Prevent damage when clamping the
cylinder in a vise; clamp on the clevis only.

This page is intentionally blank.

Hydraulic System

Page 4 -- 150

Groundsmaster 4000--D/4010--D

Chapter 5

Electrical System
Table of Contents

Groundsmaster 4000--D/4010--D

Seat Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parking Brake Switch . . . . . . . . . . . . . . . . . . . . . . .
Windshield Wiper/Washer Switch (Grounds-master 4010--D) . . . . . . . . . . . . . . . . . . . . . . . . . .
Air Conditioning Switch (Groundsmaster
4010--D) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Hour Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Main Power, Glow and Operator Cab (Grounds-master 4010--D) Relays . . . . . . . . . . . . . . . . . . .
Start and Air Conditioning (Groundsmaster
4010--D) Relays . . . . . . . . . . . . . . . . . . . . . . . . . .
Toro Electronic Controllers (TEC) . . . . . . . . . . . . .
Hydraulic Valve Solenoids . . . . . . . . . . . . . . . . . . .
Traction Neutral Switch . . . . . . . . . . . . . . . . . . . . .
Diode Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Sender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Fuel Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Sender . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Gauge . . . . . . . . . . . . . . . . . . . . . . . .
Cutting Deck Position Switches . . . . . . . . . . . . . .
Engine Coolant and Hydraulic Oil
Temperature Senders . . . . . . . . . . . . . . . . . . . . .
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . .
Battery Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Battery Service . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page 5 -- 1

28
29
30
31
32
32
33
34
35
36
38
38
39
40
41
42
43
44
46
47
47
47
48

Electrical System

Electrical
System

GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 2
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Toro Electronic Controllers (TEC) . . . . . . . . . . . . . . 2
CAN--bus Communications . . . . . . . . . . . . . . . . . . . 2
Electrical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 6
Diagnostic Display . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Starting Problems . . . . . . . . . . . . . . . . . . . . . . . . . . 11
General Run & Transport Problems . . . . . . . . . . . 13
Cutting Deck Operating Problems . . . . . . . . . . . . 14
Cutting Deck Lift/Lower Problems . . . . . . . . . . . . 15
ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Cutting Deck Position Switches . . . . . . . . . . . . . . 17
ELECTRICAL SYSTEM QUICK CHECKS . . . . . . . 18
Battery Test (Open Circuit) . . . . . . . . . . . . . . . . . . 18
Charging System Test . . . . . . . . . . . . . . . . . . . . . . 18
Glow Plug System Test . . . . . . . . . . . . . . . . . . . . . 18
Check Operation of Interlock Switches . . . . . . . . 19
COMPONENT TESTING . . . . . . . . . . . . . . . . . . . . . . 20
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operator Cab Fuses (Groundsmaster 4010--D) . 22
Warning Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
PTO Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Cutting Deck Lift Switches . . . . . . . . . . . . . . . . . . . 25
Hi/Low Speed and Headlight (Groundsmaster
4010--D) Switches . . . . . . . . . . . . . . . . . . . . . . . . 26
Flow Divider and Engine Cooling Fan Switches . 27

Toro Electronic Controllers (TEC)
Groundsmaster 4000--D and 4010--D machines use two
(2) Toro Electronic Controllers (TEC) to manage machine electrical functions. The controllers are microprocessor controlled that sense the condition of various
switches (inputs) and direct electrical power to control
appropriate machine functions (outputs) based on the
inputs. Communication between the two Toro controllers is provided with a CAN--bus system. The status of
inputs to the controllers as well as outputs from the controllers can be monitored with the Diagnostic Display
(see Special Tools in this chapter).

The controllers appear identical but they are different in
terms of the connectors and internal hardware. They are
arranged in ”master / slave” configuration and therefore
cannot be interchanged. The TEC--5002 master controller is responsible for powering up the TEC--5001 slave
controller. The TEC--5002 also controls the engine start
circuit.
IMPORTANT: Before performing any welding on the
machine, disconnect the battery cables from the
battery, disconnect the wire harness connector
from both of the TEC controllers and disconnect the
terminal connector from the alternator. These steps
will prevent damage to the machine electrical system.

CAN--bus Communications
The two (2) TEC controllers (TEC--5001 and
TEC--5002) used on the Groundsmaster 4000--D and
4010--D communicate with each other on a CAN--bus
system. Using this system allows the traction unit to fully
integrate all the different electrical components of the
machine and bring them together as one. The CAN--bus
system reduces the number of electrical components
and connections used on the machine and allows the
number of wires in the wire harness to be significantly
reduced.

CAN identifies the Controller Area Network that is used
between the controllers on the Groundsmaster. Two (2)
specially designed, twisted cables form the bus. These
wires provide the data pathways between the controllers (TEC--5001 and TEC--5002) used on the machine.
The engineering term for these two (2) cables are CAN-high and CAN--low. At the ends of the twisted pair of bus
cables are 120 ohm termination resistors.
Each of the components that is controlled by the CAN-bus link only needs four (4) wires to operate and communicate to the system: CAN--high, CAN--low, B+ (power)
and ground.

Electrical Drawings
The electrical schematic and wire harness drawings for
Groundsmaster 4000--D and 4010--D machines are located in Chapter 10 -- Foldout Drawings.

Electrical System

Page 5 -- 2

Groundsmaster 4000--D/4010--D

Special Tools
Order special tools from your Toro Distributor. Some
tools may also be available from a local supplier.

Multimeter
The multimeter can test electrical components and circuits for current, resistance or voltage.
NOTE: Toro recommends the use of a DIGITAL Volt-Ohm--Amp multimeter when testing electrical circuits.
The high impedance (internal resistance) of a digital meter in the voltage mode will make sure that excess current is not allowed through the meter. This excess
current can cause damage to circuits not designed to
carry it.

Figure 1

Skin--Over Grease
Special non--conductive grease which forms a light protective skin which helps waterproof electrical switches
and contacts.

Electrical
System

Toro Part Number: TOR50547

Figure 2

Dielectric Gel
Dielectric gel should be used to prevent corrosion of
connection terminals. To ensure complete coating of terminals, liberally apply gel to both component and wire
harness connector, plug connector to component, unplug connector, reapply gel to both surfaces and reconnect harness connector to component. Connectors
should be thoroughly packed with gel for effective results.
Toro Part Number: 107--0342
Figure 3

Groundsmaster 4000--D/4010--D

Page 5 -- 3

Electrical System

Diagnostic Display
The Diagnostic Display (Fig. 4) can be connected to the
wiring harness communication connector located under
the controller cover to verify correct electrical functions
of the machine. Toro Electronic Controller (TEC) inputs
and outputs can be checked using the Diagnostic Display.
Toro Part Number for Diagnostic Display: 85--4750
Toro Part Number for Overlay (English):
TEC--5002 Master: 119--5303
Figure 4

TEC--5001 Slave: 119--5304
NOTE: Diagnostic Display overlays are available in
several languages for your Groundsmaster. Refer to
your Parts Catalog for overlay language options and
part numbers.
IMPORTANT: The Diagnostic Display must not be
left connected to the machine. It is not designed to
withstand the environment of the machine’s every
day use. When use of Diagnostic Display is completed, disconnect it from the machine and reconnect loopback connector to harness connector.
Machine will not operate without loopback connector installed on harness. Store Diagnostic Display in
a dry, secure, indoor location and not on machine.

Figure 5
1. Overlay 119--5303

2. Overlay 119--5304

Battery Terminal Protector
Aerosol spray that should be used on battery terminals
to reduce corrosion problems. Apply terminal protector
after the battery cable has been secured to the battery
terminal.
Toro Part Number: 107--0392

Figure 6

Electrical System

Page 5 -- 4

Groundsmaster 4000--D/4010--D

Battery Hydrometer
Use the Battery Hydrometer when measuring specific
gravity of battery electrolyte. Obtain this tool locally.

Electrical
System

Figure 7

Groundsmaster 4000--D/4010--D

Page 5 -- 5

Electrical System

Troubleshooting
For effective troubleshooting and repairs, you must
have a good understanding of the electrical circuits and
components used on this machine (see Chapter 10 -Foldout Drawings).

CAUTION
Remove all jewelry, especially rings and
watches, before doing any electrical troubleshooting or testing. Also, disconnect the battery
cables unless the test requires battery voltage.

If the machine has any interlock switches by--passed,
reconnect the switches for safety and efficient troubleshooting.
NOTE: Use the Diagnostic Display (see Special Tools
in this chapter) to test Toro Electronic Controller inputs
and outputs when troubleshooting an electrical problem
on your Groundsmaster.

Diagnostic Display
Groundsmaster 4000--D and 4010--D machines are
equipped with two (2) Toro Electronic Controllers (TEC)
which control machine electrical functions. The controllers monitor various input switches (e.g. ignition switch,
seat switch, neutral switch) and energize outputs to actuate solenoids or relays for the requested machine
function.
For the TEC to control the machine as desired, each of
the inputs (switches and sensors) and outputs (solenoids and relays) must be connected and functioning
properly.
The Diagnostic Display (see Special Tools in this chapter) is a tool to help the technician verify correct electrical
functions of the machine.

Verify Diagnostic Display Input Functions
1. Park machine on a level surface, lower the cutting
decks, stop the engine and apply the parking brake.
2. Remove the controller cover to allow access to wire
harness loopback connector (Fig. 8). Locate wire harness communication port and loopback connector.
Carefully unplug loopback connector from harness connector.
3. Connect the Diagnostic Display connector to the
wire harness connector. Make sure correct overlay decal is positioned on the Diagnostic Display (Figs. 9 and
10).

4
5

CAUTION

RIGHT

The interlock switches are for the protection of
the operator and bystanders and to ensure correct operation of the machine. Do not bypass or
disconnect switches. Check the operation of the
interlock switches daily for proper operation. Replace any malfunctioning switches before operating the machine.

Electrical System

IMPORTANT: The Diagnostic Display must not be
left connected to the machine. It is not designed to
withstand the environment of the machine’s every
day use. When use of the Diagnostic Display is completed, disconnect it from the machine and reconnect loopback connector to harness connector. The
machine will not operate without the loopback connector installed on the harness. Store the Diagnostic Display in a dry, secure, indoor location and not
on machine.

FRONT

Figure 8
1. Controller cover
2. Screw (2 used)
3. Flat washer (2 used)

Page 5 -- 6

4. U--nut (2 used)
5. TEC--5001
6. TEC--5002

Groundsmaster 4000--D/4010--D

4. Turn the ignition switch to the ON position, but do not
start machine.
NOTE: The red text on the Diagnostic Display overlay
decal refers to input switches and the green text refers
to TEC outputs.

TEC--5002
MASTER
OVERLAY

5. Make sure that the “INPUTS DISPLAYED” LED, on
lower right column of the Diagnostic Display, is illuminated. If “OUTPUTS DISPLAYED” LED is illuminated,
press the toggle button on the Diagnostic Display to
change to “INPUTS DISPLAYED” LED.
6. The Diagnostic Display will illuminate the LED
associated with each of the inputs when that input switch
is closed. Individually, change each of the switches from
open to closed (i.e., sit on seat, press traction pedal,
etc.), and note that the appropriate LED on the Diagnostic Display will illuminate when the corresponding switch
is closed. Repeat on each switch that is possible to be
changed by hand (see Inputs and LED Operation chart
on following page).
NOTE: When the Diagnostic Display is attached to the
wire harness connector and the ignition switch is in the
ON position, the input LED for hydraulic temp and coolant temp should be illuminated. If the wire harness connector is disconnected from either of these sensors, the
appropriate LED should go off after a few second delay.
Then, if the harness connector is reattached to the sensor, the input LED should again illuminate after a few
seconds.

Figure 9

TEC--5001
SLAVE
OVERLAY

Electrical
System

7. If appropriate LED does not toggle on and off when
switch state is changed, check all wiring and connections to that switch and/or test switch (see Component
Testing in this chapter). Replace any defective switches
and repair any damaged wiring.
8. After input functions testing is complete, disconnect
the Diagnostic Display connector from the harness connector and plug loopback connector into wire harness.
Secure controller cover to frame.

Figure 10

Groundsmaster 4000--D/4010--D

Page 5 -- 7

Electrical System

Diagnostic Display
TEC--5002 Master Inputs

Diagnostic Display
LED Operation

P BRAKE
OFF

Parking brake released: LED ON
Parking brake applied: LED OFF

NEUTRAL

Traction pedal in neutral: LED ON
Traction pedal in forward or reverse: LED OFF

SEAT
SWITCH

Operator seat occupied: LED ON
Operator seat empty: LED OFF

HI
RANGE

Hi/Lo speed switch in HI range: LED ON
Hi/Lo speed switch in LO range: LED OFF

OIL PRESSURE
LOW

Engine not running OR low engine oil pressure: LED ON
Engine oil pressure OK: LED OFF

MODEL
SELECTOR

On Groundsmaster 4000--D and 4010--D, LED should always be ON

FAN
REVERSE

Engine cooling fan switch in momentary REVERSE: LED ON
Fan switch in AUTO position: LED OFF

ALTERNATOR
FAULT

Engine not running or alternator faulty: LED ON
Alternator OK: LED OFF

CRUISE
ON

Cruise switch (optional kit) in ON: LED ON
Cruise switch (optional kit) in OFF: LED OFF

CRUISE
ENGAGE

Cruise switch (optional kit) in momentary ENGAGE: LED ON
Cruise switch (optional kit) NOT in momentary ENGAGE: LED OFF

SERVICE
BRAKES OFF

Service brake (equipped with optional kit) released: LED ON
Service brake (equipped with optional kit) applied: LED OFF

FLOW
DIVIDER

Flow divider switch in momentary ENGAGE: LED ON
Flow divider switch in normal position: LED OFF

HYDRAULIC
TEMP

Wire harness connector attached to hydraulic sensor: LED ON
Wire harness connector NOT attached to sensor: LED OFF

COOLANT
TEMP

Wire harness connector attached to coolant sensor: LED ON
Wire harness connector NOT attached to sensor: LED OFF

KEY
START

Ignition switch in START: LED ON
Ignition switch in ON or OFF: LED OFF

KEY
RUN

Ignition switch in ON or START: LED ON
Ignition switch in OFF: LED OFF

NOTE: When the ignition switch is in the OFF position,
all Diagnostic Display LED’s should be OFF.

Electrical System

Page 5 -- 8

Groundsmaster 4000--D/4010--D

Diagnostic Display
TEC--5001 Slave Inputs

Diagnostic Display
LED Operation

C DECK
RAISE

Cutting deck lift switch for center deck in RAISE position: LED ON
Lift switch for center deck NOT in RAISE position: LED OFF

C DECK
LOWER

Cutting deck lift switch for center deck in LOWER position: LED ON
Lift switch for center deck NOT in LOWER position: LED OFF

L DECK
RAISE

Cutting deck lift switch for left deck in RAISE position: LED ON
Lift switch for left deck NOT in RAISE position: LED OFF

L DECK
LOWER

Cutting deck lift switch for left deck in LOWER position: LED ON
Lift switch for left deck NOT in LOWER position: LED OFF

R DECK
RAISE

Cutting deck lift switch for right deck in RAISE position: LED ON
Lift switch for right deck NOT in RAISE position: LED OFF

R DECK
LOWER

Cutting deck lift switch for right deck in LOWER position: LED ON
Lift switch for right deck NOT in LOWER position: LED OFF

C DECK
UP LIMIT

Center cutting deck lowered: LED ON
Center cutting deck raised: LED OFF

L DECK
UP LIMIT

Left cutting deck lowered: LED ON
Left cutting deck raised: LED OFF

R DECK
UP LIMIT

Right cutting deck lowered: LED ON
Right cutting deck raised: LED OFF

PTO
ON

PTO switch ON: LED ON
PTO switch OFF: LED OFF

KEY
RUN

Ignition switch in ON or START: LED ON
Ignition switch in OFF: LED OFF

Groundsmaster 4000--D/4010--D

Page 5 -- 9

Electrical
System

NOTE: When the ignition switch is in the OFF position,
all Diagnostic Display LED’s should be OFF.

Electrical System

Verify Diagnostic Display Output Functions

B. If the output LED’s are on as specified, but the
machine does not function properly, suspect a failed
electrical component, an open in the tested circuit or
a non-electrical problem (e.g. hydraulic component
problem). Repair as necessary.

The Diagnostic Display also has the ability to detect
which output solenoids or relays are energized by the
TEC controllers. This is a quick way to determine if a machine malfunction is electrical or hydraulic.

C. If each input switch is in the correct position and
functioning correctly, but the output LED’s are not
correctly illuminated, this indicates a TEC controller
problem. If this occurs, contact your Toro Distributor
for assistance.

NOTE: An open output (e.g. an unplugged connector or
a broken wire) cannot be detected with the Diagnostic
Display.
1. Park machine on a level surface, lower the cutting
decks, stop the engine and engage the parking brake.
2. Remove the controller cover to allow access to wire
harness loopback connector (Fig. 11). Locate wire harness communication port and loopback connector (Fig.
12). Carefully unplug loopback connector from harness
connector.

7. After output functions testing is complete, disconnect the Diagnostic Display connector from the harness
connector and plug loopback connector into wire harness. Secure controller cover to frame.
2

3. Connect the Diagnostic Display connector to the harness connector. Make sure correct overlay decal is positioned on the Diagnostic Display (Figs. 9 and 10).

4. Turn the ignition switch to the ON position.

NOTE: The red text on the Diagnostic Display overlay
decal refers to input switches and the green text refers
to TEC outputs.
5. Make sure that the “OUTPUTS DISPLAYED” LED,
on lower right column of the Diagnostic Display, is illuminated. If “INPUTS DISPLAYED” LED is illuminated,
press the toggle button on the Diagnostic Display to
change the LED to “OUTPUTS DISPLAYED”.
NOTE: It may be necessary to toggle between “INPUTS DISPLAYED” and “OUTPUTS DISPLAYED” several times to perform the following step. To change from
inputs to outputs, press toggle button once. This may be
done as often as required. Do not press and hold
toggle button.
6. Sit on seat and attempt to operate the desired function of the machine. The appropriate output LED’s
should illuminate on the Diagnostic Display to indicate
that the TEC controller is turning on that function. The
GLOW PLUGS, HI RANGE and OK RUN outputs can be
checked with the ignition switch in the ON position and
the engine not running. For testing of the hydraulic solenoid outputs (e.g. ENABLE, C DECK RAISE, R DECK
FLOAT), the engine must be running.

RIGHT
FRONT

Figure 11
1. Controller cover
2. Screw (2 used)
3. Flat washer (2 used)

4. U--nut (2 used)
5. TEC--5001
6. TEC--5002

1
2

A. If the correct output LED’s do not illuminate, verify
that the required input switches are in the necessary
positions to allow that function to occur.

3
Figure 12
1. Wire harness connector
2. Loopback connector

Electrical System

Page 5 -- 10

3. Diagnostic display

Groundsmaster 4000--D/4010--D

Starting Problems
Problem

Possible Causes

No electrical power to machine (including gauges).

The battery is discharged.
The battery cables are loose or corroded.
Fuse F3--1 (2 amp) to the ignition switch is faulty.
Bad ground connection on machine.
The ignition switch or circuit wiring is faulty.

Starter solenoid clicks, but starter will not crank.

The battery is discharged.

NOTE: If the solenoid clicks, the problem is not in the in- The battery cables are loose or corroded.
terlock circuit.
A ground wire or cable is loose or corroded.
The wiring at the starter motor is faulty.
The starter solenoid is faulty.
The starter motor is faulty.
Nothing happens when start attempt is made. Control
panel lights and gauges operate with the ignition
switch in the ON position.

The traction pedal is not in the neutral position.
The operator seat is unoccupied OR the parking brake
is not applied.
The PTO switch is ON (engaged).

TEC--5002 fuses (F3--2, F3--3 or F3--4) (7.5 amp) are
faulty.
The ignition switch or circuit wiring is faulty.
The traction neutral switch or circuit wiring is faulty.
The seat switch or circuit wiring is faulty.
The parking brake switch or circuit wiring is faulty.
The start relay or circuit wiring is faulty.
The starter solenoid or starter motor is faulty.
The TEC--5002 controller is faulty.
Engine starts, but stops when the ignition switch is
released from the START position.

The engine run solenoid or circuit wiring is faulty
(solenoid pull coil operates but hold coil is faulty).

Starter cranks, but should not, when the traction pedal
is depressed.

The traction neutral switch is out of adjustment.

Groundsmaster 4000--D/4010--D

The traction neutral switch or circuit wiring is faulty.

Page 5 -- 11

Electrical System

Electrical
System

Fuse F1--1 (20 amp) is faulty.

Starting Problems (Continued)
Problem

Possible Causes

Engine cranks, but does not start.

The fuel tank is empty.
The engine is not cranking fast enough.
Fuse F5--1 (30 amp) is faulty preventing engine run
solenoid pull coil from being energized.
Fuse M1 (60 amp) is faulty preventing glow plug
operation.
The glow relay or circuit wiring is faulty preventing glow
plug operation.
Glow plug(s) is faulty.
The engine run solenoid or circuit wiring is faulty.
The fuel pump or circuit wiring is faulty.
The engine or fuel system is malfunctioning (see
Chapter 3 -- Kubota Diesel Engine).

Electrical System

Page 5 -- 12

Groundsmaster 4000--D/4010--D

General Run and Transport Problems
Engine continues to run, but should not, when the
ignition switch is turned off.

The engine run solenoid is faulty.

Engine continues to run, but should not, when the
traction pedal is depressed with no operator in the
seat.

The seat switch or circuit wiring is faulty.

Engine stops during operation, but is able to restart.

The operator is lifting off the seat switch.

NOTE: Excessive coolant temperature will cause the
cutting decks to be disengaged and can lead to engine
shutdown. If excessive coolant temperature causes engine shutdown, the operator can restart the engine to allow the machine to be moved a short distance. After a restart in this condition, the engine will run for approximately ten (10) seconds before the engine shuts down again.

The seat switch or circuit wiring is faulty.

The engine stops when the traction pedal is
depressed.

The operator is lifting off the seat switch.

The ignition switch or circuit wiring is faulty.

The traction neutral switch or circuit wiring is faulty.

The ignition switch or circuit wiring is faulty.
The engine coolant temperature is excessive.
The engine or fuel system is malfunctioning (see
Chapter 3 -- Kubota Diesel Engine).

The parking brake is applied.
The seat switch or circuit wiring is faulty.
The parking brake switch or circuit wiring is faulty.

Battery does not charge.

Loose, corroded or broken wire(s) exist in charging
circuit.
The engine alternator belt is out of adjustment.
Electrical
System

The charge indicator lamp or circuit wiring is faulty.
The battery is faulty.
The alternator is faulty.

Groundsmaster 4000--D/4010--D

Page 5 -- 13

Electrical System

Cutting Deck Operating Problems
The cutting decks remain engaged, but should not,
with no operator in the seat.

The seat switch or circuit wiring is faulty.

Cutting deck runs, but should not, when raised. Decks
shut off with PTO switch.

The deck position switch or circuit wiring is faulty.

Cutting decks run, but should not, when raised. Decks
do not shut off with the PTO switch.

Both the deck position switch or circuit wiring and PTO
switch or circuit wiring are faulty.

The TEC--5001 controller is faulty.

A hydraulic problem exists (see Troubleshooting
section of Chapter 4 -- Hydraulic System).
Cutting decks run, but should not, when lowered with
PTO switch in the OFF (disengage) position.

The PTO switch or circuit wiring is faulty.

Cutting deck(s) do not operate.

The operator is lifting off the seat switch.

The TEC--5001 controller is faulty.

The cutting decks are not fully lowered.
Traction circuit is not in Low speed (4WD) mode.
High temperature of engine coolant or hydraulic oil has
disabled the cutting decks.
Fuse F4--4 (7.5 amp) is faulty preventing PTO manifold
solenoids from being energized.
The seat switch or circuit wiring is faulty.
The PTO switch or circuit wiring is faulty.
The deck position switch or circuit wiring is faulty.
The Hi/Low speed switch or circuit wiring is faulty.
Hydraulic valve solenoid(s) or circuit wiring to the
affected deck(s) is faulty.
A hydraulic problem exists (see Troubleshooting
section of Chapter 4 -- Hydraulic System).
The TEC--5001 controller is faulty.

Electrical System

Page 5 -- 14

Groundsmaster 4000--D/4010--D

Cutting Deck Lift/Lower Problems
Problem

Possible Causes

None of the cutting decks will lower.

The Hi/Low speed switch is in the Hi speed position.
Operator is not fully depressing the seat switch.
TEC--5001 fuse(s) (F4--1, F4--2, F4--3, F4--4) are
faulty.
The seat switch or circuit wiring is faulty.
The Hi/Low speed switch or circuit wiring is faulty.
Lift control manifold solenoid coil S1 or circuit wiring is
faulty.
A hydraulic problem in the lift/lower circuit exists (see
Troubleshooting section of Chapter 4 - Hydraulic
System).
The TEC--5001 controller is faulty.

None of the cutting units will raise.

TEC--5001 fuse(s) (F4--1, F4--2, F4--3, F4--4) are
faulty.
Lift control manifold solenoid coil S1 or circuit wiring is
faulty.

The TEC--5001 controller is faulty.
Front cutting deck will not raise or lower, but both wing The front deck lift switch or circuit wiring is faulty.
cutting decks will raise and lower.
Lift control manifold solenoid coils S5 or S6 or circuit
wiring is faulty.
A hydraulic problem exists (see Troubleshooting
section of Chapter 4 - Hydraulic System).
The TEC--5001 controller is faulty.

Groundsmaster 4000--D/4010--D

Page 5 -- 15

Electrical System

Electrical
System

A hydraulic problem in the lift/lower circuit exists (see
Troubleshooting section of Chapter 4 - Hydraulic
System).

Cutting Deck Lift/Lower Problems (Continued)
Problem

Possible Causes

RH wing cutting deck will not raise or lower, but the
front and LH wing cutting decks will raise and lower.

The RH deck lift switch or circuit wiring is faulty.
Fuse F4--3 is faulty.
Lift control manifold solenoid coils S7, S8 or S9 or
circuit wiring is faulty.
A hydraulic problem exists (see Troubleshooting
section of Chapter 4 - Hydraulic System).
The TEC--5001 controller is faulty.

LH wing cutting deck will not raise or lower, but the
front and RH wing cutting decks will raise and lower.

The LH deck lift switch or circuit wiring is faulty.
Lift control manifold solenoid coils S2, S3 or S4 or
circuit wiring is faulty.
A hydraulic problem exists (see Troubleshooting
section of Chapter 4 - Hydraulic System).
The TEC--5001 controller is faulty.

Electrical System

Page 5 -- 16

Groundsmaster 4000--D/4010--D

Adjustments
Cutting Deck Position Switches
Adjustment
1. Park machine on a level surface with front cutting
deck raised and side cutting decks lowered. Stop engine, engage parking brake and remove key from the
ignition switch.
2. There should be from 0.070” to 0.130” (1.8 to 3.3
mm) clearance between the target surface end of position switch and the sensing plate on lift arm.
2

3. If necessary, loosen jam nuts on switch and adjust
switch location to allow proper clearance between
switch and sensing plate.

4. After adjustment, torque jam nuts from 165 to 195
in--lb (18.7 to 22.0 N--m). Check that proper clearance
between switch and sensing plate still exists after tightening jam nuts.
Figure 13
1. Front lift arm (lowered)
2. Position switch

3. Sensing plate

Electrical
System

NOTE: The cutting deck position switches include a
LED. The switch LED should be illuminated when the
cutting decks are fully lowered.

2
4

3
Figure 14

1. Side lift arm (LH shown)
2. Position switch

Groundsmaster 4000--D/4010--D

Page 5 -- 17

3. Sensing plate
4. Clearance

Electrical System

Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Set multimeter to the DC volts setting. The battery
should be at a temperature of 60o to 100oF (16o to
38oC). The ignition key should be off and all accessories
turned off. Connect the positive (+) multimeter lead to
the positive battery post and the negative (--) multimeter
lead to the negative battery post. The multimeter will display battery voltage.

Voltage Measured

Battery Charge Level

12.68 V (or higher)

Fully charged (100%)

12.45 V

75% charged

12.24 V

50% charged

12.06 V

25% charged

11.89 V

0% charged

NOTE: This test provides a relative condition of the battery. Load testing of the battery will provide additional
and more accurate information.

Charging System Test
This is a simple test used to determine if a charging system is functioning. It will tell you if the charging system
has an output, but not its capacity.

Start the engine and run at high idle (2870 RPM). Allow
the battery to charge for at least three (3) minutes. Record the battery voltage.

Use a digital multimeter set to DC volts. Connect the
positive (+) multimeter lead to the positive battery post
and the negative (--) multimeter lead to the negative battery post. Keep the test leads connected to the battery
posts and record the battery voltage.

After running the engine for at least three (3) minutes,
battery voltage should be at least 0.50 volt higher than
initial battery voltage.

NOTE: Upon starting the engine, the battery voltage
will drop and then should increase once the engine is
running.
NOTE: Depending upon the condition of the battery
charge and battery temperature, the battery voltage will
increase at different rates as the battery charges.

An example of a charging system that is functioning:
At least 0.50 volt over initial battery voltage.
Initial Battery Voltage

= 12.30 v

Battery Voltage after 3 Minute Charge

= 12.85 v

Difference

= +0.55 v

Glow Plug System Test
This is a fast, simple test that can help to determine the
integrity and operation of your Groundsmaster glow
plug system. The test should be performed anytime
hard starting (cold engine) is encountered on a diesel
engine equipped with a glow plug system.

ammeter pickup around the main glow plug power supply wire and read the meter prior to activating the glow
plug system. Adjust the meter to read zero (if applicable). Activate the glow plug system by turning the ignition switch to ON and record the multimeter results.

Use a digital multimeter and/or inductive Ammeter (AC/
DC Current Transducer). Properly connect the ammeter
to the digital multimeter (refer to manufacturers’ instructions) and set the multimeter to the correct scale. With
the ignition switch in the OFF position, place the

The Groundsmaster glow plug system should have a
reading of approximately nine (9) amps per glow plug
(36 amps total). If low current reading is observed, one
(or more) of the glow plugs is faulty.

Electrical System

Page 5 -- 18

Groundsmaster 4000--D/4010--D

Check Operation of Interlock Switches

CAUTION

NOTE: Use the Diagnostic Display (see Special Tools
in this chapter) to test Toro Electronic Controller inputs
and outputs before further troubleshooting of an electrical problem on your Groundsmaster.

Electrical
System

Do not disconnect safety switches. They are for
the operator’s protection. Check the operation of
the interlock switches daily for proper operation.
Replace any malfunctioning switches before operating the machine.

Interlock switch operation is described in the Traction
Unit Operator’s Manual. Your Groundsmaster is
equipped with two (2) Toro Electronic Controllers (TEC)
which monitor interlock switch operation. Testing of individual interlock switches and relays is included in the
Component Testing section of this Chapter.

Groundsmaster 4000--D/4010--D

Page 5 -- 19

Electrical System

Component Testing
For accurate resistance and/or continuity checks, electrically disconnect the component being tested from the
circuit (e.g. unplug the ignition switch connector before
checking continuity on the switch).
NOTE: For engine component testing information, see
the Kubota Workshop Manual, Diesel Engine,
03--M--E3B Series at the end of Chapter 3 -- Kubota Diesel Engine.

CAUTION
When testing electrical components for continuity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.

Ignition Switch
The ignition (key) switch on the console arm has three
(3) positions (OFF, ON/PREHEAT and START) (Fig.
15).
Testing
1. Before disconnecting the ignition switch for testing,
the switch and its circuit wiring should be tested as a
TEC--5002 input with the Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the ignition switch and circuit wiring are functioning correctly, no
further switch testing is necessary. If, however, the Display determines that the ignition switch and circuit wiring
are not functioning correctly, proceed with test.

6. If ignition switch tests correctly and circuit problem
still exists, check wire harness (see Electrical Schematics and Wire Harness Drawings in Chapter 10 -- Foldout
Drawings).
7. After testing is completed, connect the wire harness
connector to the ignition switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Disassemble console arm to gain access to ignition
switch (see Console Arm Disassembly in the Service
and Repairs section of Chapter 7 -- Chassis).
4. Disconnect wire harness electrical connector from
the ignition switch.
5. The ignition switch terminals are identified as shown
in Figure 16. The circuit logic of the ignition switch is
shown in the chart below. With the use of a multimeter
(ohms setting), the switch functions can be tested to determine whether continuity exists between the various
terminals for each switch position. Verify continuity between switch terminals. Replace ignition switch if testing
identifies that switch is faulty.
POSITION

CIRCUIT

OFF

NONE

ON/PREHEAT

B + C + F, D + E

START

A+B+C

1
Figure 15
1. Console arm

2. Ignition switch

ON/PREHEAT
OFF

45o

START

B
C

REAR VIEW

FRONT VIEW
Figure 16
Electrical System

Page 5 -- 20

Groundsmaster 4000--D/4010--D

Fuses
The fuse blocks are located in the power center under
the hood on the right side of the machine (Fig. 17).
In addition to the fuses in the fuse blocks, a 40 amp fuse
(F5--1) is included in the wire harness to protect the pull
coil circuit for the engine run solenoid. This fuse resides
in a fuse holder near the starter motor (Fig. 17).
Fuse Identification and Function
Use Figure 18 to identify each individual fuse and its correct amperage in the fuse block. The fuses have the following functions.

Fuse Testing
Turn ignition switch to the ON position (do not start engine). With the fuse installed in the fuse block, use a
multimeter to verify that 12 VDC exists at both of the terminal test points on the fuse. If 12 VDC exists at one of
the fuse test points but not at the other, the fuse is faulty.
If necessary, make sure that ignition switch is OFF and
key is removed from switch. Remove fuse from fuse
block and check that fuse has continuity across the fuse
terminals.

Fuse F1--1 (20 amp) protects engine starter circuit.

Fuse F1--3 (10 amp) protects light circuit on Groundsmaster 4010--D.
Fuse F1--4 (10 amp) protects signal light circuit on
Groundsmaster 4010--D.
Fuse F2--2 (10 amp) protects operator seat circuit.
Fuse F2--3 (10 amp) protects power point circuit.
1

Fuse F2--4 (10 amp) protects main power supply circuit.
Fuse F3--1 (2 amp) protects logic power circuit to the
TEC--5002 controller.

Figure 17
1. Power center

2. Fuse F5--1

Fuse F3--3 (7.5 amp) protects power supply for the
TEC--5002 controller outputs.

M1 (60A)

20A

OPTION

10A

OPTION

10A

Fuse F4--3 (7.5 amp) protects power supply for the
TEC--5001 controller outputs.

7.5A

Fuse F4--4 (7.5 amp) protects power supply for the
TEC--5001 controller outputs.

7.5 A

7.5A

Fuse F4--1 (2 amp) protects logic power circuit to the
TEC--5001 controller.
Fuse F4--2 (7.5 amp) protects power supply for the
TEC--5001 controller outputs.

Fuse M1 (60A) protects engine glow plug circuit.
Fuse M2 (60A) protects operator cab circuit on Groundsmaster 4010--D.

Groundsmaster 4000--D/4010--D

Page 5 -- 21

10A

M2 (60A)

Fuse F3--4 (7.5 amp) protects power supply for the
TEC--5002 controller outputs.

Electrical
System

Fuse F3--2 (7.5 amp) protects power supply for the
TEC--5002 controller outputs.

FRONT

Figure 18

Electrical System

Operator Cab Fuses (Groundsmaster 4010--D)
The cab fuse blocks are located in the cab headliner
(Fig. 19).
Identification and Function (Figs. 19 and 20)

Fuse F1--2 (15 Amp) protects the cab fan circuit.
Fuse F1--3 (30 Amp) protects the air conditioner circuit.
Fuse F2--1 (15 Amp) protects the windshield wiper/
washer circuit.
Fuse F2--2 (15 Amp) protects the cab dome light circuit.
Fuses F1--1, F1--4, F2--3 and F2--4 are available for optional equipment.
Testing

Figure 19
1. Cab headliner switches

Turn ignition switch to the ON position (do not start engine). With the fuse installed in the fuse block, use a
multimeter to verify that 12 VDC exists at both of the terminal test points on the fuse. If 12 VDC exists at one of
the fuse test points but not at the other, the fuse is faulty.
If necessary, make sure that ignition switch is OFF and
key is removed from switch. Remove fuse from fuse
block and check that fuse has continuity across the fuse
terminals.

2. Cab fuse blocks

15 A

30A

15 A

Figure 20

Electrical System

Page 5 -- 22

Groundsmaster 4000--D/4010--D

Warning Lights
Charge Indicator Light

3. Apply 12 VDC to terminals 1A and 2A (Fig. 22).

The charge indicator light should come on when the ignition switch is in ON with the engine not running or with
an improperly operating charging circuit while the engine is running.

4. Ground terminals 1B and 2B (Fig. 22).

To test the charge indicator light and circuit wiring,
ground the white wire attached to alternator. Turn ignition switch to ON; the charge indicator light should illuminate indicating correct operation of the electrical wiring
to the alternator.

5. Both indicator lights should illuminate.
6. Connect wire harness electrical connector to the indicator light.
7. Install control arm cover to machine (see Control
Arm Assembly in the Service and Repairs section of
Chapter 7 -- Chassis).

Engine Oil Pressure Light
The engine oil pressure light should come on when the
ignition switch is in the ON position with the engine not
running. Also, it should light with the engine running if
the engine oil pressure drops below 7 PSI (0.5 kg/cm2).

1
2

To test the oil pressure light and circuit wiring, ground the
green wire attached to oil pressure switch located on
right side of engine near the starter motor. Turn ignition
switch to ON; the oil pressure light should illuminate indicating correct operation of the electrical wiring to the oil
pressure switch.

High Temperature Warning Light
Figure 21
1. Charge indicator
2. Engine oil pressure

To test the high temperature warning light and circuit wiring, start the engine and ground the gray wire attached
to the temperature sender attached to water flange on
engine (see Temperature Sender in this section). Warning light should illuminate.

3. High temp warning
4. Glow plug indicator

Glow Plug Indicator Light
The glow plug light should come on when the ignition
switch is placed in ON/PREHEAT prior to placing the
ignition switch in START. The light should stay lit for
approximately seven (7) seconds while the ignition
switch is left in ON.

Testing Indicator Lights

1. Remove control arm covers to gain access to indicator light and harness connectors (see Control Arm Disassembly in the Service and Repairs section of Chapter
7 -- Chassis).

2. Locate the indicator light to be tested and disconnect
the wire harness electrical connector from the light.

Groundsmaster 4000--D/4010--D

Figure 22
1. Charge indicator
2. Engine oil pressure
3. High temp warning

Page 5 -- 23

4. Glow plug indicator
5. Warning light back

Electrical System

Electrical
System

If the engine coolant temperature rises to approximately
220oF (105oC), the high temperature light should come
on and the PTO (cutting decks) will disengage.

PTO Switch
The PTO switch is located on the console arm (Fig. 23).
The PTO switch is pulled up to engage the PTO and
pushed in to disengage the PTO.
The TEC--5001 controller monitors the position of the
PTO switch (up or down). Using inputs from the PTO
switch and other switches in the interlock system, the
TEC--5001 controller controls the energizing of the hydraulic solenoid valves used to drive the cutting deck
motors.
NOTE: To engage the PTO, the seat has to be occupied, traction speed has to be in Low range (4WD) and
the cutting decks have to be fully lowered.

6. If PTO switch tests correctly and circuit problem still
exists, check wire harness (see Electrical Schematics
and Wire Harness Drawings in Chapter 10 -- Foldout
Drawings).
7. After testing is completed, connect the wire harness
connector to the PTO switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

Testing
1. Before disconnecting the PTO switch for testing, the
switch and its circuit wiring should be tested as a TEC
input with the Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this chapter). If the
Diagnostic Display verifies that the PTO switch and circuit wiring are functioning correctly, no further switch
testing is necessary. If, however, the Display determines
that the PTO switch and circuit wiring are not functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.

2
Figure 23
1. PTO switch

2. Control console

3. Disassemble console arm to gain access to PTO
switch (see Console Arm Disassembly in the Service
and Repairs section of Chapter 7 -- Chassis).

4. Disconnect harness electrical connector from the
PTO switch.
5. The switch terminals are marked as shown in Figure
24. The circuit logic of the PTO switch is shown in the
chart below. With the use of a multimeter (ohms setting),
the switch functions can be tested to determine whether
continuity exists between the various terminals for each
switch position. Verify continuity between switch terminals. Replace PTO switch if testing identifies that switch
is faulty.
SWITCH
POSITION

CLOSED
CIRCUITS

OPEN
CIRCUITS

OFF (DOWN)

COM B + NC B
COM C + NC C

COM B + NO B
COM C + NO C

ON (UP)

COM B + NO B
COM C + NO C

COM B + NC B
COM C + NC C

Electrical System

Figure 24
1. COM B terminal
2. NO B terminal
3. NC B terminal

4. COM C terminal
5. NO C terminal
6. NC C terminal

NOTE: Only PTO switch terminals COM C and NO C
are used on Groundsmaster 4000--D and 4010--D machines.

Page 5 -- 24

Groundsmaster 4000--D/4010--D

Cutting Deck Lift Switches
7. After testing is completed, connect wire harness
connector to the lift switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

NOTE: To lower the cutting decks, traction speed has
to be in low range (4WD). Also, to raise or lower the
decks, the operator seat has to be occupied.

Testing
1. Before disconnecting the lift switch for testing, the
switch and its circuit wiring should be tested as a
TEC--5001 input with the Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the lift
switch and circuit wiring are functioning correctly, no further switch testing is necessary. If, however, the Display
determines that the lift switch and circuit wiring are not
functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.

1
Figure 25
1. Console arm
2. Front deck lift switch

3. RH deck lift switch
4. LH deck lift switch

3. Disassemble console arm to gain access to cutting
deck lift switches (see Console Arm Disassembly in the
Service and Repairs section of Chapter 7 -- Chassis).
4. Disconnect harness electrical connector from the lift
switch that is to be tested.
5. The switch terminals are marked as shown in Figure
26. The circuit logic of the lift switches is shown in the
chart below. With the use of a multimeter (ohms setting),
the switch functions may be tested to determine whether
continuity exists between the various terminals for each
position. Verify continuity between switch terminals. Replace lift switch if testing identifies a faulty switch.
SWITCH
POSITION

CLOSED
CIRCUITS

OPEN
CIRCUITS

DECK LOWER

2+3
5+6

2+1
5+4

NEUTRAL

NONE

ALL

DECK RAISE

2+1
5+4

2+3
5+6

BACK OF SWITCH
Figure 26
NOTE: Lift switch terminals 4, 5 and 6 are not used on
Groundsmaster 4000--D and 4010--D machines.

6. If lift switch tests correctly and circuit problem still exists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Drawings).
Groundsmaster 4000--D/4010--D

Page 5 -- 25

Electrical System

Electrical
System

The cutting deck lift switches are used as inputs for the
TEC--5001 controller to raise or lower the cutting decks.
When the front of a lift switch is depressed and held, the
controlled decks will lower. When the rear of a lift switch
is depressed and held, the controlled decks will raise.
The decks will remain in position when the switch is released. The lift switches are located on the console arm
(Fig. 25).

Hi/Low Speed and Headlight (Groundsmaster 4010--D) Switches
The Hi/Low speed and headlight switches (Groundsmaster 4010--D) are identical, two (2) position rocker
switches that are located on the control console.
The Hi/Low speed switch (Fig. 27) is used as an input for
the TEC--5002 controller to set the machine traction
speed for Hi speed (2WD) or Low speed (4WD).

6. After testing is completed, connect wire harness
connector to the switch.
7. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

The Groundsmaster 4010--D headlight switch allows
the headlights to be turned on and off.
NOTE: Before disconnecting the Hi/Low speed switch
for testing, the switch and its circuit wiring should be
tested as a TEC--5002 input with the Diagnostic Display
(see Diagnostic Display in the Troubleshooting section
of this chapter). If the Diagnostic Display verifies that the
Hi/Low speed switch and circuit wiring are functioning
correctly, no further switch testing is necessary. If, however, the Display determines that the Hi/Low speed
switch and circuit wiring are not functioning correctly,
proceed with test.

Testing

Figure 27

1. Make sure ignition switch is OFF. Remove key from
ignition switch.

1. Console arm

2. Hi/Low speed switch

2. Disassemble console arm to gain access to switch
that is to be tested (see Console Arm Disassembly in the
Service and Repairs section of Chapter 7 -- Chassis).
3. Disconnect harness electrical connector from the
switch.
4. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
switch position. The switch terminals are marked as
shown in Figure 28. The circuitry of the switch is shown
in the chart below. Verify continuity between switch terminals. Replace switch if testing identifies a faulty
switch.
SWITCH
POSITION

CIRCUIT 1

CIRCUIT 2

2+3

5+6

OFF

2+1

5+4

BACK OF SWITCH
Figure 28
NOTE: Switch terminals 1, 4, 5 and 6 are not used on
Groundsmaster 4000--D and 4010--D machines.

5. If switch tests correctly and circuit problem still exists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Drawings).

Electrical System

Page 5 -- 26

Groundsmaster 4000--D/4010--D

Flow Divider and Engine Cooling Fan Switches
The flow divider and engine cooling fan switches are
identical, two (2) position rocker switches that are located on the control console (Fig. 29). These switches
have a normal and a momentary position.

6. If switch tests correctly and circuit problem still exists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Drawings).

The flow divider switch is used as an input for the
TEC--5002 controller to energize the solenoid valve in
the hydraulic traction manifold. When the flow divider
switch is depressed (momentary), traction pump hydraulic flow is split between the front wheel motors
(approximately 45%) and rear axle motor (approximately 55%) to reduce the chance that excessive traction
pump flow goes to a spinning wheel. The flow divider
switch only functions when the machine Hi/Low speed
switch is in the Low speed (4WD) position.

7. After testing is completed, connect wire harness
connector to the switch.
8. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

The engine cooling fan switch is used as an input for the
TEC--5002 controller to allow the engine cooling fan to
run in the normal, automatic mode or in the manual, reverse (momentary) direction.

Testing

3
Figure 29
1. Console arm
2. Cooling fan switch

3. Flow divider switch

Electrical
System

1. Before disconnecting the flow divider or engine cooling fan switch for testing, the switch and its circuit wiring
should be tested as a TEC input with the Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this chapter). If the Diagnostic Display verifies
that switch and circuit wiring are functioning correctly, no
further switch testing is necessary. If, however, the Display determines that the switch and circuit wiring are not
functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Disassemble console arm to gain access to the
switch that is to be tested (see Console Arm Disassembly in the Service and Repairs section of Chapter 7 -Chassis).

BACK OF SWITCH

4. Disconnect harness electrical connector from the
switch.
5. With the use of a multimeter (ohms setting), the
switch functions may be tested to determine whether
continuity exists between the various terminals for each
position. The switch terminals are marked as shown in
Figure 30. The circuitry of the flow divider and cooling
fan switch is shown in the chart below. Verify continuity
between switch terminals.
SWITCH
POSITION

NORMAL
CIRCUITS

OTHER
CIRCUITS

NORMAL

2+3

5+6

MOMENTARY

2+1

5+4

Groundsmaster 4000--D/4010--D

Figure 30
NOTE: Only flow divider and cooling fan switch terminals 1 and 2 are used on Groundsmaster 4000--D and
4010--D machines.

Page 5 -- 27

Electrical System

Seat Switch
The seat switch is normally open and closes when the
operator is on the seat. This switch is used as an input
for the TEC--5002 controller. The seat switch and its
electrical connector are located in the seat assembly. If
the traction system or PTO switch is engaged when the
operator raises out of the seat, the engine will stop. Testing of the switch can be done without seat removal by
disconnecting the switch wire from the machine wire
harness (Fig. 31).
Testing

1. Before disconnecting the seat switch for testing, the
switch and its circuit wiring should be tested as a
TEC--5002 input with the Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the seat
switch and circuit wiring are functioning correctly, no further switch testing is necessary. If, however, the Display
determines that the seat switch and circuit wiring are not
functioning correctly, proceed with test.

Figure 31
1. Seat switch electrical connector
2. Operator seat

2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Disconnect seat switch connector from the machine
wire harness connector.
4. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the seat switch connector terminals.
5. With no pressure on the seat, there should not be
continuity between the seat switch terminals.
6. Press directly onto the seat switch through the seat
cushion. There should be continuity as the seat cushion
approaches the bottom of its travel.
7. If testing determines that seat switch is faulty, replace seat switch (see Operator Seat Service in the Service and Repairs section of Chapter 7 -- Chassis).
8. Connect seat switch connector to wire harness connector after testing is complete.

Electrical System

Page 5 -- 28

Groundsmaster 4000--D/4010--D

Parking Brake Switch
The switch used for the parking brake is a normally open
switch that is located under the steering tower cover
(Fig. 32). The brake switch is used as an input for the
TEC--5002 controller. When the parking brake is not applied, the parking brake pawl depresses the switch
plunger to close the switch. When the parking brake is
applied, the parking brake pawl is positioned away from
the switch plunger so the switch is in its normal, open
state.
Testing
1. Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC--5002 input with the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the parking brake switch and circuit wiring are functioning correctly, no further switch testing is necessary. If, however,
the Display determines that the brake switch and circuit
wiring are not functioning correctly, proceed with test.

2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Locate parking brake switch for testing (see Steering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis).

Figure 32
1. Parking brake switch
2. Parking brake rod

3. Parking brake pawl

Electrical
System

4. Disconnect wire harness connector from the brake
switch.
5. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector terminals.
6. When the brake switch plunger is extended there
should not be continuity between the switch terminals.
7. When the brake switch plunger is depressed, there
should be continuity between the switch terminals.
8. After testing, connect wire harness connector to
parking brake switch.
9. Secure all removed components to steering tower
(see Steering Tower Assembly in the Service and Repairs section of Chapter 7 -- Chassis).

Groundsmaster 4000--D/4010--D

Page 5 -- 29

Electrical System

Windshield Wiper/Washer Switch (Groundsmaster 4010--D)
The windshield wiper/washer switch is used to control
operation of the windshield wiper and washer pump on
the Groundsmaster 4010--D. The windshield wiper/washer switch is located in the cab headliner (Fig. 33).

Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.
2. Remove switch plate from cab headliner.
3. Locate windshield wiper/washer switch and unplug
wire harness connector from switch.
4. The switch terminals are marked as shown in Figure
34. The circuit logic of the wiper/washer switch is shown
in the chart below. With the use of a multimeter (ohms
setting), the switch functions may be tested to determine
whether continuity exists between the various terminals
for each position. Verify continuity between switch terminals. Replace wiper/washer switch if testing identifies a
faulty switch.
SWITCH
POSITION

CLOSED
CIRCUITS

OPEN
CIRCUITS

OFF

NONE

ALL

WIPER ON

2+3

5+6

WASHER ON

2+3
5+6

NONE

1
Figure 33
1. Cab headliner

2. Wiper/washer switch

BACK OF SWITCH

5. If switch tests correctly and circuit problem still exists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Drawings).

Figure 34

6. Connect the wire harness connector to the switch after testing.
7. Install switch plate to cab headliner after switch testing is complete.

Electrical System

Page 5 -- 30

Groundsmaster 4000--D/4010--D

Air Conditioning Switch (Groundsmaster 4010--D)
The air conditioning switch is used to control operation
of the air conditioning system on the Groundsmaster
4010--D. The switch is located in the cab headliner (Fig.
35).
Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.
2. Remove switch plate from cab headliner.

3. Locate air conditioning switch and unplug wire harness connector from switch.
4. The switch terminals are marked as shown in Figure
36. The circuit logic of the air conditioning switch is
shown in the chart below. With the use of a multimeter
(ohms setting), the switch functions may be tested to determine whether continuity exists between the various
terminals for each position. Verify continuity between
switch terminals. Replace switch if testing identifies a
faulty switch.
CLOSED
CIRCUITS

OPEN
CIRCUITS

AC OFF

2+3
5+6

2+1
5+4

AC ON

2+1
5+4

2+3
5+6

Figure 35
1. Cab headliner

2. Air conditioning switch

BACK OF SWITCH

5. If switch tests correctly and circuit problem still exists, check wire harness (see Electrical Schematics and
Wire Harness Drawings in Chapter 10 -- Foldout Drawings).

Electrical
System

SWITCH
POSITION

Figure 36

6. Connect the wire harness connector to the air conditioning switch after testing.
7. Install switch plate to cab headliner after switch testing is complete.

Groundsmaster 4000--D/4010--D

Page 5 -- 31

Electrical System

Hour Meter
The hour meter is located on the outside of the console
arm.
Testing

7. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

1. Make sure ignition switch is OFF. Remove key from
ignition switch.

Hobbs

QUARTZ

2. Disassemble console arm to gain access to the hour
meter (see Console Arm Disassembly in the Service
and Repairs section of Chapter 7 -- Chassis).

00001
HOURS

3. Connect the positive (+) terminal of a 12 VDC source
to the positive (+) terminal of the hour meter (Fig. 37).

1
10

4. Connect the negative (--) terminal of the voltage
source to the other terminal of the hour meter.
5. The hour meter should move a 1/10 of an hour in six
(6) minutes.

BACK
Figure 37

6. Disconnect voltage source from the hour meter. Reconnect harness connector to hour meter.

Audio Alarm
The audio alarm sounds to notify the operator when a
machine problem exists. Electrical current for the alarm
is provided as an output from the TEC--5002 controller.
The alarm is attached to the console arm next to the operator seat.
Testing

6. Disconnect voltage source from the alarm. Reconnect harness connector to alarm.
7. Assemble console arm (see Console Arm Assembly
in the Service and Repairs section of Chapter 7 -- Chassis).

1. Make sure ignition switch is OFF. Remove key from
ignition switch.

2. Disassemble console arm to gain access to the audio alarm (see Console Arm Disassembly in the Service
and Repairs section of Chapter 7 -- Chassis).
3. Disconnect wire harness connector from alarm.
IMPORTANT: Make sure to observe polarity on the
alarm terminals when testing. Damage to the alarm
may result from an improper connection.

Figure 38
1. Alarm top view
2. Alarm bottom view

3. Positive (+) terminal
4. Negative (--) terminal

4. Correctly connect 12VDC source to the alarm terminals (Fig. 38).
5. Alarm should sound as long as 12VDC is connected
to the alarm terminals.

Electrical System

Page 5 -- 32

Groundsmaster 4000--D/4010--D

Main Power, Glow and Operator Cab Power (Groundsmaster 4010--D) Relays
The main power, glow and operator cab power relays
are located at the power center behind the operator seat
(Fig. 39). The wire harness is attached to these relays
with a four (4) wire connector (Fig. 40).

8. Secure relay to mounting bracket and connect wire
harness connector to relay. Secure power center to tank
support if it was removed. Install cover (item 1) and heat
shield (item 11) to power center.

The main power relay is used to provide current to the
TEC controllers and most of the fuse protected circuits
(operator seat, power point and optional electric equipment). When the ignition switch is in the ON or START
position, the main power relay is energized.

9. Connect positive (+) cable to battery and then connect negative (--) cable to battery (see Battery Service
in the Service and Repairs section of this chapter).
10.Lower and secure hood.

The glow relay is used to provide current to the engine
glow plugs when the relay is energized by the
TEC--5002 controller. The TEC--5002 controls and monitors the operation of the glow relay.

The operator cab power relay on Groundsmaster
4010--D machines is used to provide current to the operator cab electrical components. When the ignition
switch is in the ON or START position, the cab power
relay is energized.

Testing

1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch. Raise and support hood.

3. Remove cover (item 1) and heat shield (item 11) from
power center and locate relay to be tested. If necessary,
remove two (2) flange nuts and carriage screws that secure power center to tank support.

FRONT

Figure 39
1.
2.
3.
4.
5.
6.

4. Disconnect wire harness connector from relay. Remove relay from mounting bracket for testing.
5. Using a multimeter, verify that coil resistance between terminals 86 and 85 is approximately 72 ohms.
6. Connect multimeter (ohms setting) leads to relay terminals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.

Cover
Screw
Flange nut (2 used)
Carriage screw (2 used)
Screw
Mount

7.
8.
9.
10.
11.
12.

Lock nut
Main power relay
Glow relay
Cab power relay
Heat shield
Screw (2 used)

30
85

86
87

Figure 40

7. Disconnect voltage and test leads from the relay terminals.

Groundsmaster 4000--D/4010--D

Page 5 -- 33

Electrical System

Electrical
System

2. To make sure that machine operation does not occur
unexpectedly, disconnect negative (--) cable from battery and then disconnect positive (+) cable from battery
(see Battery Service in the Service and Repairs section
of this chapter).

RIGHT 10

Start and Air Conditioning (Groundsmaster 4010--D) Relays
When energized by the TEC--5002 controller, the start
relay is used to provide current to the engine starter motor solenoid. The start relay is located at the power center behind the operator seat (Fig. 41).
An identical relay is used to control the air conditioning
electrical power circuit on the Groundsmaster 4010--D.
When energized by the air conditioning switch, the relay
provides current for the air conditioning components.
The relay is attached to the cab headliner above the
switch panel.
The start and air conditioning relays are attached to the
wire harness with a five (5) wire connector (Fig. 42).

nals 30 and 87A as +12 VDC is applied and removed
from terminal 85.
9. After testing, disconnect voltage and multimeter test
leads from the relay terminals. Secure relay to mounting
bracket and connect wire harness connector to relay.
10.Secure all removed components. If battery cables
were disconnected, connect positive (+) cable first to
battery and then connect negative (--) cable to battery
(see Battery Service in the Service and Repairs section
of this chapter).
11. Make sure that hood is secured.

Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.

2. To access start relay:
5

A. Raise and support hood.
B. To make sure that machine operation does not
occur unexpectedly, disconnect negative (--) cable
from battery and then disconnect positive (+) cable
from battery (see Battery Service in the Service and
Repairs section of this chapter).
C. Remove cover (item 1) and heat shield (item 9)
from power center and locate relay to be tested. If
necessary, remove two (2) flange nuts and carriage
screws that secure power center to tank support.
3. To access air conditioning relay, remove screws that
secure switch panel to headliner in cab.

RIGHT 7

FRONT

Figure 41
1.
2.
3.
4.
5.

Cover
Screw
Flange nut (2 used)
Carriage screw (2 used)
Screw

4. Disconnect wire harness connector from relay. Remove relay from mounting bracket for testing.

6.
7.
8.
9.
10.

6. Connect multimeter (ohms setting) leads to relay terminals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.

Electrical System

87A

7. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
8. Connect multimeter (ohms setting) leads to relay terminals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should make and break continuity between termi-

5. Using a multimeter, verify that coil resistance between terminals 85 and 86 is from 71 to 88 ohms.

Mount
Lock nut
Start relay
Heat shield
Screw (2 used)

Figure 42
1. Coil terminal
2. Common terminal

Page 5 -- 34

3. Normally closed term.
4. Normally open term.

Groundsmaster 4000--D/4010--D

Toro Electronic Controllers (TEC)

Logic power is provided to the controllers as long as the
battery cables are connected to the battery. A pair of 2
amp fuses (F3--1 and F4--1) provide circuit protection for
this logic power to the controllers.

IMPORTANT: Before performing welding on the machine, disconnect both positive and negative battery cables from the battery, disconnect wire
harness connector from both of the TEC controllers
and disconnect the terminal connector from the alternator. These steps will prevent damage to the machine electrical system.

The TEC--5002 master controller monitors the states of
the following components as inputs: ignition switch,
parking brake switch, traction neutral switch, seat
switch, engine oil pressure switch, flow divider switch,
Hi/Low speed switch, hydraulic temperature sender, engine coolant temperature sender, engine cooling fan
switch and optional cruise control switches (if
equipped).

FRONT
2
3

The TEC--5001 controller controls electrical output to
the hydraulic PTO and lift manifold solenoid coils. Circuit
protection for TEC--5001 outputs is provided by three (3)
7.5 amp fuses (F4--2, F4--3 and F4--4).

4
5

The TEC--5002 controller controls electrical output to
the TEC--5001 controller, hydraulic fan drive manifold
solenoid coils (speed and direction), fuel pump, engine
run solenoid (hold coil), glow plug relay, start relay, high
temperature warning light, diagnostic light, audio alarm,
hydraulic 4WD manifold solenoid coil (flow divider), hydraulic traction manifold solenoid coil (Hi/Low speed)
and optional cruise control coil (if equipped). Circuit
protection for TEC--5002 outputs is provided by three (3)
7.5 amp fuses (F3--2, F3--3 and F3--4).
The TEC--5001 slave controller monitors the states of
the following components as inputs: ignition switch, cutting deck lift switches, PTO switch and deck position
switches.

RIGHT

8
9

Figure 43
1.
2.
3.
4.
5.

Controller cover
Screw (2 used)
Flat washer (2 used)
Flange nut (8 used)
Front cover mount

6.
7.
8.
9.

Cap screw (8 used)
U--nut (2 used)
TEC--5001 controller
TEC--5002 controller

Because of the solid state circuitry built into the TEC
controllers, there is no method to test a controller directly. A controller may be damaged if an attempt is made
to test it with an electrical test device (e.g. digital multimeter or test light).
NOTE: The TEC controllers used on the Groundsmaster 4000 and 4010 are matched for correct machine operation. If either of these components are replaced for
any reason, system software needs to be reprogrammed by your Toro Distributor.

Figure 44
1. TEC--5001 controller
2. TEC--5002 controller

Groundsmaster 4000--D/4010--D

Page 5 -- 35

3. Operator seat

Electrical System

Electrical
System

Groundsmaster 4000--D and 4010--D machines use two
Toro Electronic Controllers (TEC) to control electrical
system operation. The controllers are attached to the
operator platform under the controller cover (Figs. 43
and 44).

Hydraulic Valve Solenoids

6
5

RIGHT
FRONT

Figure 45
1. 4WD manifold
2. LH PTO manifold
3. Traction manifold

4. Front PTO manifold
5. Fan drive manifold

Several hydraulic solenoid valve coils are used on the
hydraulic control manifolds of Groundsmaster 4000--D
and 4010--D machines. When energized by the TEC
controller, these coils provide hydraulic circuit control.
Solenoid valve coils with two (2) different resistance
specifications are used on the 4000--D and 4010--D.
The correct resistance of a coil can be identified by measuring the height and diameter of the coil (Fig. 46). Resistance testing of the coils can be done with the coil
remaining on the hydraulic valve.

Electrical System

6. RH PTO manifold
7. Lift/lower manifold

NOTE: To assist in troubleshooting, identical solenoid
coils can be exchanged. If the problem follows the exchanged coil, a problem with the coil likely exists. If the
problem remains unchanged, something other than the
solenoid coil is the problem source (e.g. switch, circuit
wiring, hydraulic problem). Refer to your parts catalog to
determine if solenoid coils are identical.

Page 5 -- 36

Groundsmaster 4000--D/4010--D

Testing
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Locate hydraulic valve solenoid coil to be tested (Fig.
45). Disconnect wire harness connector from coil.
3. Identify coil resistance specification by measuring
the coil diameter and coil height (Fig. 46).

COIL
DIAMETER

NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this value from from the measured value of the component you
are testing.

COIL
HEIGHT

4. Using a multimeter (ohms setting), measure resistance between the two (2) connector terminals on the
solenoid valve coil. The correct resistance for the solenoid coil is identified below:
COIL
HEIGHT

COIL
RESISTANCE

1.84 in
(46.7 mm)

1.96 in
(49.9 mm)

7.1 ohm

1.41 in
(35.8 mm)

1.43 in
(36.3 mm)

8.8 ohm

Figure 46

NOTE: Solenoid coil resistance should be measured
with solenoid at approximately 68oF (20oC). Resistance
may be slightly different than listed at different temperatures. Typically, a failed solenoid coil will either be
shorted (very low or no resistance) or open (infinite resistance).

5 ft--lb
(6.7 N--m)

5. If solenoid coil resistance is incorrect, replace solenoid:

4
1

A. Remove nut securing solenoid to the cartridge
valve. Carefully slide solenoid off the valve.
B. Install new solenoid coil to the cartridge valve.
Install and torque nut 5 ft--lb (6.7 N--m). Over--tightening may damage the solenoid coil or cause the
cartridge valve to malfunction.

TRACTION
MANIFOLD SHOWN

Figure 47
1. Hydraulic manifold
2. Cartridge valve

3. Solenoid coil
4. Nut

6. After testing is completed, connect wire harness
connector to the solenoid.

Groundsmaster 4000--D/4010--D

Page 5 -- 37

Electrical System

Electrical
System

COIL
DIAMETER

Traction Neutral Switch
The traction neutral switch is closed when the traction
pedal is in the neutral position and opens when the pedal
is depressed in either direction (forward or reverse). The
neutral switch is used as an input to the TEC--5002 controller. The switch is located on the right side of the piston (traction) pump (Fig. 48).

See the Eaton Model 72400 Servo Controlled Piston
Pump Repair Information at the end of Chapter 4 -- Hydraulic System for neutral switch disassembly and assembly procedures.

Testing
Before disconnecting the traction neutral switch for testing, the switch and its circuit wiring should be tested as
a TEC--5002 input with the Diagnostic Display (see
Diagnostic Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the neutral switch and circuit wiring are functioning correctly, no
further switch testing is necessary. If, however, the Display determines that the neutral switch and circuit wiring
are not functioning correctly, proceed with test.
Test the neutral switch by disconnecting the wire harness connector from the switch and connecting a multimeter (set to ohms) across the two (2) switch terminals.
With the engine turned off, slowly push the traction pedal
in a forward or reverse direction while watching the
multimeter. There should be indications that the traction
neutral switch is opening (high resistance) and closing
(no resistance). Allow the traction pedal to return to the
neutral position. There should be continuity (no resistance) across the switch terminals when the traction pedal is in the neutral position.

1
Figure 48
1. Piston pump (bottom)

2. Neutral switch

Diode Assembly
The Groundsmaster engine wire harness contains a
diode that is used for circuit protection from voltage
spikes when the engine starter solenoid is de--energized. The diode plugs into the wiring harness near the
engine starter motor (see Engine Wire Harness Drawing
in Chapter 10 -- Foldout Drawings).

Testing

The diode can be tested using a digital multimeter
(diode test or ohms setting) and the table to the right.

Figure 49
1. Diode
2. Male terminal

Electrical System

3. Female terminal

Multimeter
Red Lead (+)
on Terminal

Multimeter
Black Lead (--)
on Terminal

Continuity

Female

Male

YES

Male

Female

Page 5 -- 38

Groundsmaster 4000--D/4010--D

Fuel Sender
The fuel sender is located on top of the fuel tank.

7. Replace sender as necessary. Install sender into fuel
tank.

Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.

8. Connect wires to fuel sender. Apply skin--over
grease (see Special Tools in this chapter) to sender terminals.

2. Remove white (+) wire and black (--) wire from the
fuel sender.

CAUTION

If testing circuit wiring and fuel gauge, make sure
wire connections are secure before turning ignition switch ON to prevent an explosion or fire
from sparks.
3. To test the circuit wiring and fuel gauge, connect
white and black wires and turn ignition switch to ON.
Fuel gauge needle should point to the right edge of the
green area (full). Turn ignition switch OFF and continue
testing fuel sender if circuit wiring and gauge are acceptable.
4. Remove screws and lock washers that secure the
fuel sender to the fuel tank.

Figure 50
1. Fuel sender
2. White (+) lead

3. Black (--) lead

5. Remove fuel sender and gasket from the fuel tank.
Clean all fuel from the sender.
FULL POSITION

Electrical
System

NOTE: Before taking small resistance readings with a
digital multimeter, short meter test leads together. The
meter will display a small resistance value. This internal
resistance of the meter and test leads should be subtracted from the measured value of the component.

EMPTY POSITION

CAUTION
Make sure sending unit is completely dry (no fuel
on it) before testing. Perform test away from the
fuel tank to prevent an explosion or fire from
sparks.

Figure 51

6. Check resistance of the sender with a multimeter
(Fig. 51):
A. Resistance with the float in the full position should
be from 27.5 to 39.5 ohms.
B. Resistance with the float in the empty position
should be from 240 to 260 ohms.

Groundsmaster 4000--D/4010--D

Page 5 -- 39

Electrical System

Fuel Gauge
The fuel gauge can be tested using a new gauge as a
substitute or with the use of a DC voltage source and a
variable resistance box.
Testing
1. Make sure ignition switch is OFF. Remove key from
ignition switch.
2. Locate fuel gauge for testing (see Steering Tower
Disassembly in the Service and Repairs section of
Chapter 7 -- Chassis).

VARIABLE
RESISTANCE

14 VDC + 0.01 VDC

CAUTION

Make sure the voltage source is turned OFF before connecting it to the electrical circuit to avoid
electrical shock and to prevent damaging the
gauge.
3. Connect fuel gauge to the variable resistance and
DC voltage source (Fig. 52).

Figure 52

NOTE: When reading the gauge test point, there are
two white dots on the gauge face below the edge of the
glass cover for the each test point. For each variable resistance setting, the needle must be pointed between
the two white dots.
4. Take test point readings (Fig. 53):
IMPORTANT: Allow circuit to warm up for at least 5
minutes before taking test readings.
A. Set variable resistance to 240 ohms. Apply a 14 +
0.01 VDC to the circuit. The needle should point to
the left edge of the red area (empty).
B. Set variable resistance to 33 ohms. The needle
should point to the right edge of the green area (full).
5. Turn off the voltage source. Disconnect voltage
source, gauge and variable resistance.

3
Figure 53
1. Empty position
2. Full position

3. Glass face edge

6. Secure all removed components to steering tower
(see Steering Tower Assembly in the Service and Repairs section of Chapter 7 -- Chassis).

Electrical System

Page 5 -- 40

Groundsmaster 4000--D/4010--D

Fuel Pump
The fuel pump is attached to the frame above the fuel
water separator (Fig. 54).
Operational Test

1. Park machine on a level surface, lower cutting
decks, stop engine and apply parking brake.

2. Remove fuse F1--1 (20 amp) (Fig. 55) from fuse
block to prevent the engine from cranking.
3. Disconnect fuel hose (pump discharge) from the fuel
water separator.

4. Make sure fuel hoses attached to the fuel pump are
free of obstructions.
Figure 54

5. Place fuel hose (pump discharge) into a large, graduated cylinder sufficient enough to collect 1 quart (0.95
liter).

1. Fuel water separator
2. Fuel pump

6. Collect fuel in the graduated cylinder by turning ignition switch to the ON position. Allow pump to run for fifteen (15) seconds, then turn switch to OFF.

FUSE F1--1

20A

OPTION

10A

7.5A

7.5 A

7.5A

FRONT

Electrical
System

10A

OPTION

9. Install fuse F1--1 (20 amp) into fuse block.

M2 (60A)

8. Replace fuel pump as necessary. Install fuel hose to
the water separator.

M1 (60A)

7. The amount of fuel collected in the graduated cylinder should be approximately 16 fl oz (475 ml) after fifteen (15) seconds.

3. Pump inlet hose
4. Pump discharge hose

10.Prime fuel system.

Figure 55
Fuel Pump Specifications
Pump Capacity
Pressure
Current Draw

Groundsmaster 4000--D/4010--D

Page 5 -- 41

64 fl oz/min (1.9 l/min)
7 PSI (48.3 kPa)
2.0 amp

Electrical System

Temperature Sender
The temperature sender is located near the alternator
on the water flange attached to the engine cylinder head
(Fig. 56). The resistance of the temperature sender reduces as the engine coolant temperature increases.
There is a gray harness wire attached to the terminal of
the switch.

Testing
2

1. Lower coolant level in the engine and remove the
temperature sender from water flange.
2. Suspend sender in a container of oil with a thermometer and slowly heat the oil (Fig. 57).
Figure 56

CAUTION

1. Temperature sender

2. Alternator

Handle the hot oil with extreme care to prevent
personal injury or fire.
NOTE: Prior to taking resistance readings with a digital
multi meter, short the meter test leads together. The meter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal resistance of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.
3. Check resistance of the sender with a multimeter
(ohms setting) as the temperature increases. Replace
sender if specifications are not met.
COOLANT TEMP

Figure 57

TEMP SENDER RESISTANCE

100oF

(38oC)

460 ohms (approximate)

160oF

(71oC)

140 ohms (approximate)

200oF

(93oC)

54 to 78 ohms

221oF

(105oC)

50 ohms (approximate)

4. After testing is complete, install sender to the water
flange.
A. Thoroughly clean threads of water flange and
sender. Apply thread sealant to the threads of the
sender.
B. Screw sender into the water flange. Torque sender from 16 to 20 ft--lb (22 to 27 N--m).
C. Reconnect gray harness wire to sender. Apply
skin--over grease (Toro Part No. 505--165) to sender
terminal.
5. Fill engine cooling system.
Electrical System

Page 5 -- 42

Groundsmaster 4000--D/4010--D

Temperature Gauge
The temperature gauge on the control panel indicates
engine coolant temperature level during machine operation (Fig. 58). The changing resistance of the engine
temperature sender signals the temperature gauge.
The temperature gauge should display the first green
segment when the ignition switch is turned to ON. The
first yellow segment on the gauge should display when
engine coolant temperature is approximately 212oF
(100oC).

When engine coolant temperature rises to approximately 221oF (105oC), the temperature gauge should display
the first red segment.

3
1
Figure 58
3. High temp indicator

Electrical
System

1. Console arm
2. Temperature gauge

Groundsmaster 4000--D/4010--D

Page 5 -- 43

Electrical System

Cutting Deck Position Switches
Three (3) cutting deck position switches are used on the
Groundsmaster 4000--D and 4010--D. These switches
are located on the traction unit frame (Figs. 59 and 60).
The position switches are powered proximity switches
that incorporate an internal reed switch and a LED. The
deck position switches are used as inputs for the
TEC--5001 controller to prevent deck operation when a
cutting deck is raised. The switch sensing plates are attached to the cutting deck lift arms. The position
switches for front and side decks are different.
The single front cutting deck position switch is a normally closed switch. When the front cutting deck is lowered,
the sensing plate on the lift arm is away from the position
switch so the switch is in its normally closed state. When
the front cutting deck is raised, the sensing plate is
moved near the position switch and the switch opens.
The two (2) side cutting deck position switches are normally open switches. When a side cutting deck is lowered, the sensing plate on the lift arm is near the position
switch and the switch closes. When a side cutting deck
is raised, the sensing plate is moved away from the position switch so the switch is in its normally open state.

Figure 59
1. Front lift arm (lowered)
2. Position switch

3. Sensing plate

Testing
1. The cutting deck position switches and their circuit
wiring should be tested as a TEC--5001 input with the
Diagnostic Display (see Diagnostic Display in the Troubleshooting section of this chapter). If the Diagnostic
Display verifies that the position switches and circuit wiring are functioning correctly, no further switch testing is
necessary. If, however, the Display determines that a
position switch and circuit wiring are not functioning correctly, proceed with test.
2. Park machine on a level surface, lower cutting
decks, stop engine and apply parking brake.
3. Turn ignition switch to the ON position (do not start
engine) and check LED on cable end of position
switches (Fig. 61). Switch LED should be illuminated
when the cutting decks are fully lowered.
4. Start engine, fully raise cutting decks and then stop
engine. Then, turn ignition switch to the ON position (do
not start engine) and check LED on cable end of position
switches. Switch LED should not be illuminated when
the cutting decks are fully raised.

2
4

3
Figure 60

1. Side lift arm (LH shown)
2. Position switch

3. Sensing plate
4. Clearance

5. If a position switch LED did not function correctly:
A. Position cutting deck so sensing plate on the lift
arm is near the position switch (front cutting deck
raised and side cutting decks lowered).
Electrical System

Page 5 -- 44

Groundsmaster 4000--D/4010--D

B. Make sure that ignition switch is OFF and disconnect the switch connector from wire harness.
C. Using a multimeter, verify that wire harness connector terminal for pink wire has 12 VDC when the
ignition switch is ON.

1
2

D. Make sure that clearance between end of position switch and sensing plate is from 0.070” and
0.130” (1.8 to 3.3 mm). If necessary, adjust position
switch (see Cutting Deck Position Switches in the
Adjustments section of this chapter). Recheck
switch operation after adjustment.
E. If pink wire has system voltage present and gap is
correct but switch LED did not function, replace position switch.

3
Figure 61
1. Side position switch
2. Sensing plate

3. Switch LED location

Electrical
System

6. After testing is complete, make sure that position
switch connector is plugged into wire harness.

Groundsmaster 4000--D/4010--D

Page 5 -- 45

Electrical System

Engine Coolant and Hydraulic Oil Temperature Senders
The Groundsmaster 4000--D and 4010--D use two (2)
temperature senders as inputs for the TEC--5002 to
identify if either the engine coolant or hydraulic oil temperature has reached an excessive level. These senders are identical. The coolant temperature sender
threads into the radiator (Fig. 62). The hydraulic oil temperature sender is attached to the hydraulic hydraulic
tube on the left side of the machine (Fig. 63).

6. Check and fill system (coolant or hydraulic) to proper
level.

Testing
1. Locate temperature sender that is to be tested. Disconnect wire harness connector from sender.

2. Thoroughly clean area around temperature sender
and remove sender.
3. Put sensing end of sender in a container of oil with
a thermometer and slowly heat the oil (Fig. 64).

CAUTION

Figure 62
1. Radiator

2. Coolant temp sender

RIGHT

Handle the hot oil with extreme care to prevent
personal injury or fire.

FRONT

NOTE: Prior to taking resistance readings with a digital
multimeter, short the meter test leads together. The meter will display a small resistance value (usually 0.5
ohms or less). This resistance is due to the internal resistance of the meter and test leads. Subtract this value
from from the measured value of the component you are
testing.

4. Check resistance of the sender with a multimeter
(ohms setting) as the oil temperature increases.
A. The meter should indicate from 11.6 to 13.5 kilo
ohms at 68oF (20oC).

Figure 63
1. Hydraulic tube

2. Oil temp sender

B. The meter should indicate from 2.3 to 2.5 kilo
ohms at 140oF (60oC).
C. The meter should indicate from 605 to 669 ohms
at 212oF (100oC).
D. Replace sender if specifications are not met.
5. After allowing the sender to cool, install sender:
A. Install new O--ring on sender.
B. Install sender into port and torque from 9 to 11 ft-lb (12.3 to 14.9 N--m).
Figure 64

C. Reconnect harness wire to sender.
Electrical System

Page 5 -- 46 Rev. A

Groundsmaster 4000--D/4010--D

Service and Repairs
NOTE: For engine component repair information (e.g.
starter motor), see the Kubota Workshop Manual, Diesel Engine, 03--M--E3B Series at the end of Chapter 3
-- Kubota Diesel Engine.

Battery Storage
If the machine will be stored for more than 30 days:
1. Remove the battery and charge it fully (see Battery
Service in this section).
2. Either store battery on a shelf or on the machine.

4. Store battery in a cool atmosphere to avoid quick deterioration of the battery charge.
5. To help prevent the battery from freezing, make sure
it is fully charged (see Battery Service in this section).

3. Leave battery cables disconnected if the battery is
stored on the machine.

Battery Care
1. Battery electrolyte level must be properly maintained. The top of the battery must be kept clean. lf the
machine is stored in a location where temperatures are
extremely high, the battery will discharge more rapidly
than if the machine is stored in a location where temperatures are cool.

3. Battery cables must be tight on terminals to provide
good electrical contact.

WARNING

WARNING
Wear safety goggles and rubber gloves when
working with electrolyte. Charge battery in a
well ventilated place so gasses produced while
charging can dissipate. Since the gases are explosive, keep open flames and electrical sparks
away from the battery; do not smoke. Nausea
may result if the gases are inhaled. Unplug charger from electrical outlet before connecting or
disconnecting charger leads to or from battery
posts.
IMPORTANT: Do not remove fill caps while cleaning.

4. If corrosion occurs at terminals, disconnect cables.
Always disconnect negative (--) cable first. Clean
clamps and terminals separately. Reconnect cables
with positive (+) cable first. Coat battery posts and cable
connectors with battery terminal protector (Toro Part No.
107--0392) or petroleum jelly to prevent corrosion.
5. Check electrolyte level every 25 operating hours and
every 30 days if machine is in storage.
6. Maintain cell level with distilled water. Do not fill cells
above the fill line.

2. Check battery condition weekly or after every 50
hours of operation. Keep terminals and entire battery
case clean because a dirty battery will discharge slowly.
A. Clean battery by washing entire case with a solution of baking soda and water. Rinse with clear water.
B. Coat battery posts and cable connectors with battery terminal protector (Toro Part No. 107--0392) or
petroleum jelly to prevent corrosion.
Groundsmaster 4000--D/4010--D

Page 5 -- 47

Electrical System

Electrical
System

Connecting battery cables to the wrong battery
post could result in personal injury and/or damage to the electrical system.

Battery Service
The battery is the heart of the electrical system. With
regular and proper service, battery life can be extended.
Additionally, battery and electrical component failure
can be prevented.

CAUTION
When working with batteries, use extreme caution to avoid splashing or spilling electrolyte.
Electrolyte can destroy clothing and burn skin or
eyes. Always wear safety goggles and a face
shield when working with batteries.
Electrolyte Specific Gravity
Fully charged: 1.265 corrected to 80oF (27oC)
Discharged: less than 1.240
Battery Specifications
BCI Group Size 34
690 CCA at 0oF (--18oC)
110 minutes reserve capacity at 80oF (27oC)

Figure 65
1. Negative cable
2. Positive cable

3. Battery strap

Battery Inspection and Maintenance
1. Perform following inspections and maintenance:
A. Check battery for cracks. Replace battery if
cracked or leaking.

Dimensions (including terminal posts and
caps)
Length 10.2 inches (259 mm)
Width 6.6 inches (167 mm)
Height 8.0 inches (203 mm)

B. Check battery terminal posts for corrosion. Use
wire brush to clean corrosion from posts.

Battery Removal and Installation (Fig. 65)
1. Raise and support operator seat. Remove battery
access panel.
2. Loosen and remove negative cable from battery. After negative cable is removed, loosen and remove positive cable.
3. Loosen battery strap that secures battery to machine.

IMPORTANT: Before cleaning the battery, tape
or block vent holes to the filler caps and make
sure the caps are on tightly.
C. Check for signs of wetness or leakage on the top
of the battery which might indicate a loose or missing
filler cap, overcharging, loose terminal post or overfilling. Also, check battery case for dirt and oil. Clean
the battery with a solution of baking soda and water,
then rinse it with clean water.
D. Check that the cover seal is not broken away. Replace the battery if the seal is broken or leaking.

4. Carefully remove battery from machine.
5. Install battery in reverse order making sure to connect and tighten positive cable to battery before connecting negative cable.
NOTE: Before connecting the negative (ground) cable
to the battery, connect a digital multimeter (set to DC
amps) between the negative battery post and the negative (ground) cable connector. The reading should be
less than 0.1 amp. If the reading is 0.1 amp or more, the
machine’s electrical system should be tested for short
circuits or faulty components and repaired.

E. Check the electrolyte level in each cell. If the level
is below the tops of the plates in any cell, fill all cells
with distilled water between the minimum and maximum fill lines. Charge at 15 to 25 amps for fifteen (15)
minutes to allow sufficient mixing of the electrolyte.

6. Secure battery with battery strap. Install battery access panel. Lower and secure operator seat.
Electrical System

Page 5 -- 48

Groundsmaster 4000--D/4010--D

A. Check the voltage across the battery terminals
prior to testing the battery. If the voltage is less than
12.4 VDC, charge the battery before performing a
load test.

Battery Testing
1. Conduct a hydrometer test of the battery electrolyte.
IMPORTANT: Make sure the area around the cells is
clean before opening the battery caps.

B. If the battery has been charged, apply a 150 amp
load for fifteen (15) seconds to remove the surface
charge. Use a battery load tester following the
manufacturer’s instructions.

A. Measure the specific gravity of each cell with a
hydrometer. Draw electrolyte in and out of the
hydrometer barrel prior to taking a reading to warm-up the hydrometer. At the same time take the temperature of the cell.

C. Make sure battery terminals are free of corrosion.
D. Measure the temperature of the center cell.

B. Temperature correct each cell reading. For each
10oF (5.5oC) above 80oF (26.7oC) add 0.004 to the
specific gravity reading. For each 10oF (5.5oC) below 80oF (26.7oC) subtract 0.004 from the specific
gravity reading.

E. Connect a battery load tester to the battery terminals following the manufacturer’s instructions.
Connect a digital multimeter to the battery terminals.
F. Apply a test load of 345 amps (one half the cranking performance rating of the battery) for fifteen (15)
seconds.

Example: Cell Temperature
100oF
Cell Gravity
1.245
100oF minus 80oF equals 20oF
(37.7oC minus 26.7oC equals 11.0oC)
20oF multiply by 0.004/10oF equals 0.008
(11oC multiply by 0.004/5.5oC equals 0.008)
ADD (conversion above)
0.008
Correction to 80oF (26.7oC)
1.253

G. Take a battery voltage reading at fifteen (15) seconds, then remove the load.
H. Using the table below, determine the minimum
voltage for the cell temperature reading:
Minimum
Voltage

Battery Electrolyte
Temperature

9.6

70oF (and up)

21oC (and up)

9.5

60oF

16oC

9.4

50oF

10oC

9.3

40oF

4 oC

9.1

30oF

--1oC

2. Perform a high--discharge test with an adjustable
load tester.

8.9

20oF

--7oC

8.7

10oF

--12oC

This is one of the most reliable means of testing a battery
as it simulates the cold--cranking test. A commercial battery load tester is required to perform this test.

8.5

0 oF

--18oC

CAUTION

I. If the test voltage is below the minimum, replace
the battery. If the test voltage is at or above the minimum, return the battery to service.

Follow the manufacturer’s instructions when using a battery load tester.

Groundsmaster 4000--D/4010--D

Page 5 -- 49

Electrical System

Electrical
System

C. If the difference between the highest and lowest
cell specific gravity is 0.050 or greater or the lowest
cell specific gravity is less than 1.225, charge the battery. Charge at the recommended rate and time given in Charging or until all cells specific gravity is
1.225 or greater with the difference in specific gravity
between the highest and lowest cell less than 0.050.
If these charging conditions can not be met, replace
the battery.

Battery Charging
To minimize possible damage to the battery and allow
the battery to be fully charged, the slow charging method is presented here. This charging method can be accomplished with a constant current battery charger
which is readily available.

CAUTION
Follow the manufacturer’s instructions when using a battery charger.
NOTE: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1. Determine the battery charge level from either its
specific gravity or open circuit voltage.
Battery Charge
Level

Specific
Gravity

Open Circuit
Voltage

100%

1.265

12.68

75%

1.225

12.45

50%

1.190

12.24

25%

1.155

12.06

1.120

11.89

2. Determine the charging time and rate using the battery charger manufacturer’s instructions or the following table.
Battery
Reserve
Capacity
(Minutes)

CAUTION
Do not charge a frozen battery because it can explode and cause injury. Let the battery warm to
60oF (16oC) before connecting to a charger.
Charge the battery in a well--ventilated place to
dissipate gases produced from charging. These
gases are explosive; keep open flame and electrical spark away from the battery. Do not smoke.
Nausea may result if the gases are inhaled. Unplug the charger from the electrical outlet before
connecting or disconnecting the charger leads
from the battery posts.
3. Following the battery charger manufacturer’s
instructions, connect the charger cables to the battery.
Make sure a good connection is made.
4. Charge the battery following the battery charger
manufacturer’s instructions.
5. Occasionally check the temperature of the battery
electrolyte. If the temperature exceeds 125oF (52oC) or
the electrolyte is violently gassing or spewing, the
charging rate must be lowered or temporarily stopped.
6. Three (3) hours prior to the end of the charging, measure the specific gravity of a battery cell once per hour.
The battery is fully charged when the cells are gassing
freely at a low charging rate and there is less than a
0.003 change in specific gravity for three consecutive
readings.

Battery Charge Level
(Percent of Fully Charged)
75%

50%

25%

80 or less

3.8 hrs
@
3 amps

7.5 hrs
@
3 amps

11.3 hrs
@
3 amps

15 hrs
@
3 amps

81 to 125

5.3 hrs
@
4 amps

10.5 hrs 15.8 hrs
@
@
4 amps 4 amps

21 hrs
@
4 amps

126 to
170

5.5 hrs
@
5 amps

11 hrs
@
5 amps

16.5 hrs
@
5 amps

22 hrs
@
5 amps

171 to
250

5.8 hrs
@
6 amps

11.5 hrs
@
6 amps

17.3 hrs
@
6 amps

23 hrs
@
6 amps

above
250

6 hrs
12 hrs
18 hrs
24 hrs
@
@
@
@
10 amps 10 amps 10 amps 10 amps

Electrical System

Page 5 -- 50

Groundsmaster 4000--D/4010--D

Chapter 6

Axles, Planetaries and Brakes
Table of Contents

Axles, Planetaries
and Brakes

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . . 4
Brake Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Brake Inspection and Repair . . . . . . . . . . . . . . . . . . 8
Planetary Wheel Drive Assembly . . . . . . . . . . . . . 10
Planetary Wheel Drive Service . . . . . . . . . . . . . . . 12
Rear Axle Assembly . . . . . . . . . . . . . . . . . . . . . . . . 16
Rear Axle Service . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Bevel Gear Case and Axle Case . . . . . . . . . . . . . 22
Differential Shafts . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Axle Shafts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Input Shaft/Pinion Gear . . . . . . . . . . . . . . . . . . . . . 28
Differential Gear . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Pinion Gear to Ring Gear Engagement . . . . . . . . 33

Groundsmaster 4000--D/4010--D

Page 6 -- 1

Axles, Planetaries and Brakes

Specifications
Item

Specification

Tire pressure (front and rear)

25 to 30 PSI (172 to 207 kPa)

Rear wheel toe--in

0.125 in (3.18 mm)

Planetary gear drive oil
System gear lube capacity (each wheel)

SAE 85W--140 wt. gear lube
16 fl. oz. (0.47 liters)

Rear axle lubricant
System gear lube capacity

SAE 85W--140 wt. gear lube
80 fl. oz. (2.37 liters)

Rear axle gear box lubricant
System gear lube capacity

SAE 85W--140 wt. gear lube
16 fl. oz. (0.47 liters)

Wheel lug nut torque

85 to 100 ft--lb (115 to 135 N--m), front and rear

Steering cylinder castle nut torque

100 to 125 ft--lb (139 to 169 N--m)

Planetary mounting screw torque

75 to 85 ft--lb (101 to 115 N--m)

Brake housing mounting screw torque

75 to 85 ft--lb (101 to 115 N--m)

Front wheel motor mounting screw torque

75 to 85 ft--lb (101 to 115 N--m)

Axles, Planetaries and Brakes

Page 6 -- 2

Groundsmaster 4000--D/4010--D

General Information
Operator’s Manual

Axles, Planetaries
and Brakes

Groundsmaster 4000--D/4010--D

Page 6 -- 3

Axles, Planetaries and Brakes

Service and Repairs
Brake Assembly
85 to 100 ft--lb
(115 to 135 N--m)

16
17

3 2

5
15

1
18
4

75 to 85 ft--lb
(101 to 115 N--m)

6
7

2 3 2

RIGHT
FRONT

12
13
1

75 to 85 ft--lb
(101 to 115 N--m)

6
9

Figure 1
1.
2.
3.
4.
5.
6.

Planetary assembly
Retaining ring
Splined brake shaft
Brake assembly (RH)
O--ring
Hydraulic wheel motor

Axles, Planetaries and Brakes

7.
8.
9.
10.
11.
12.

Flat washer (2 used per side)
Cap screw (2 used per side)
Flange head screw (4 used per side)
Brake assembly (LH)
Jam nut (1 used per side)
Compression spring (1 used per side)

Page 6 -- 4

13.
14.
15.
16.
17.
18.

Brake link (1 used per side)
Spring plate (2 used per side)
Flange head screw (6 used per side)
Wheel assembly
Lug nut (8 used per wheel)
Gasket

Groundsmaster 4000--D/4010--D

Removal (Fig. 1)
24

1. Park machine on a level surface, lower cutting
decks, stop engine and remove key from the ignition
switch.

21
22

2. Drain oil from planetary wheel drive/brake assembly.
5

CAUTION

When removing front wheel, use correct jacks
and supports. Make sure machine is parked on a
solid, level surface such as a concrete floor.
Prior to raising machine, remove any attachments that may interfere with the safe and proper raising of the machine. Always chock or block
wheels. Use jack stands to support the raised
machine. If the machine is not properly supported by jack stands, the machine may move or
fall, which may result in personal injury.

4. Remove front wheel assembly.
5. Remove hydraulic wheel motor (see Front Wheel
Motors in the Service and Repairs section of Chapter 4
-- Hydraulic System).
6. Disconnect brake link assembly from brake lever,
frame bracket and pull rod on brake assembly (Fig. 2).
7. Support brake assembly to prevent it from falling.

4
21

17
12

8
9

Figure 2
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.

Brake lever
Thrust washer (2 used)
Flat washer
Lock nut
Bushing
Clevis pin
Lock nut
Cap screw
Brake link
Rod end (LH thread)
Jam nut (LH thread)
Hex link
Flanged spacer

14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.

8. Remove flange head screws (item 9) securing brake
assembly to frame.

Compression spring
Brake link
Brake assembly
Jam nut
Spring plate
Jam nut
Brake cable
Flat washer
Cotter pin
Screw (2 used)
Cable bracket
Frame rail

9. Remove brake assembly from machine. Be careful
to not drop splined brake shaft (item 3) as brake assembly is removed.
10.Remove splined brake shaft from brake assembly.
11. Remove and discard gasket (item 18). Make sure
that all gasket material is removed from both brake and
planetary assemblies.

2
1

12.Complete brake inspection and repair (see Brake Inspection and Repair in this section).
Figure 3

Installation (Fig. 1)
1. Install splined brake shaft (item 3) into brake assembly. NOTE: The stepped end of the splined brake shaft
must be aligned toward the hydraulic wheel motor (Fig.
4).
Groundsmaster 4000--D/4010--D

1. Brake housing
2. Check plug

Page 6 -- 5

3. Brake link assembly

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

3. Chock rear wheels and jack up front of machine (see
Jacking Instructions in Chapter 1 -- Safety). Support machine with jack stands.

6
19

1
2

2. Apply gasket sealant to sealing surfaces of new gasket (item 18). Apply gasket to brake assembly.
3. Install brake assembly onto machine, aligning
splined brake shaft with input shaft on planetary wheel
drive.
4. Secure brake assembly to planetary assembly with
four (4) flange head screws (item 9). Tighten screws in
a crossing pattern to a torque from 75 to 85 ft--lb (101
to 115 N--m).
5. Secure brake link assembly to pull rod on brake assembly, frame bracket and brake lever (Fig. 2). Brake
link end should be completely threaded onto pull rod before tightening jam nut.
6. Install new O--ring on hydraulic wheel motor. Install
wheel motor and torque cap screws from 75 to 85 ft--lb
(101 to 115 N--m).

1
Figure 4
1. Splined brake shaft step
2. Hydraulic motor end

3. Planetary assembly end

0.470” to 0.530”
(12.0 to 13.4 mm)

WARNING
Failure to maintain proper wheel lug nut torque
could result in failure or loss of wheel and may
result in personal injury.
1

7. Install wheel assembly.
8. Lower machine to ground. Torque lug nuts from 85
to 100 ft--lb (115 to 135 N--m).
9. Make sure drain plug is installed in bottom of brake
assembly. Fill planetary wheel drive/brake assembly
with SAE 85W--140 gear lube. Capacity is approximately 16 fl. oz. (0.47 liters) per wheel.

Figure 5
1. Pull rod jam nut

2. Brake link

10.Check and adjust brake cables for proper brake operation. If necessary, adjust hex link (item 12 in Fig. 2)
so that pull rod jam nut is positioned from 0.470” to
0.530” (12.0 to 13.4 mm) from brake casting surface
when brakes are disengaged (Fig. 5).

Axles, Planetaries and Brakes

Page 6 -- 6

Groundsmaster 4000--D/4010--D

Axles, Planetaries
and Brakes

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 6 -- 7

Axles, Planetaries and Brakes

Brake Inspection and Repair
2
1

6
7

10
14
13
12

Figure 6
1.
2.
3.
4.
5.

Brake housing (LH shown)
Seal
Pull rod
Clevis pin (2 used)
Link (2 used)

6.
7.
8.
9.
10.

Hitch pin (2 used)
Stationary disc (4 used)
Rotating disc (3 used)
Retaining ring
Gasket

11.
12.
13.
14.
15.

Rotating actuator
Extension spring (3 used)
Ball (3 used)
Plug
O--ring

Brake Inspection and Repair (Fig. 6)

6. Remove seal (item 2) from brake housing.

1. Scrape gasket material (item 10) from brake housing
and planetary wheel drive mounting surfaces.

7. Wash parts in cleaning solvent. Inspect components
for wear or damage.

2. Remove retaining ring (item 9) from brake housing
groove.

8. Reverse steps 2 through 6 to assemble brakes,
installing new parts as necessary. Install a new seal
(item 2).

3. Remove stationary discs (item 7) and rotating discs
(item 8).
4. Remove extension springs (item 12).

9. Use a new gasket (item 10) when installing brake assembly to machine.

5. Remove actuator assembly (items 11, 6, 5, 4 and 3)
and balls (item 13).

Axles, Planetaries and Brakes

Page 6 -- 8

Groundsmaster 4000--D/4010--D

Axles, Planetaries
and Brakes

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 6 -- 9

Axles, Planetaries and Brakes

Planetary Wheel Drive Assembly
13
14

85 to 100 ft--lb
(115 to 135 N--m)

3 2

5
12

1
11
4

75 to 85 ft--lb
(101 to 115 N--m)

6
7

3
2

RIGHT

FRONT

75 to 85 ft--lb
(101 to 115 N--m)

6
9

Figure 7
1.
2.
3.
4.
5.

Planetary assembly
Retaining ring
Splined brake shaft
Brake assembly (RH)
O--ring

Axles, Planetaries and Brakes

6.
7.
8.
9.
10.

Hydraulic wheel motor
Flat washer (2 used per side)
Cap screw (2 used per side)
Flange head screw (4 used per side)
Brake assembly (LH)

Page 6 -- 10

11.
12.
13.
14.

Gasket
Flange head screw (6 used per side)
Wheel assembly
Lug nut (8 used per side)

Groundsmaster 4000--D/4010--D

NOTE: The planetary wheel drive assembly can be serviced with the planetary installed to machine (see Planetary Wheel Drive Service in this section). Use the
following procedure to remove and install planetary
wheel drive assembly from machine.
Removal (Fig. 7)
1. Park machine on a level surface, lower cutting
decks, stop engine and remove key from the ignition
switch.
2. Drain oil from planetary wheel drive/brake assembly.

CAUTION
When removing front wheel, use correct jacks
and supports. Make sure machine is parked on a
solid, level surface such as a concrete floor.
Prior to raising machine, remove any attachments that may interfere with the safe and proper raising of the machine. Always chock or block
wheels. Use jack stands to support the raised
machine. If the machine is not properly supported by jack stands, the machine may move or
fall, which may result in personal injury.

2. Install brake assembly (see Brake Assembly Installation in this section).
3. Install hydraulic wheel motor (see Front Wheel Motors in the Service and Repairs section of Chapter 4 -Hydraulic System).
4. Install wheel assembly.

WARNING
Failure to maintain proper wheel lug nut torque
could result in failure or loss of wheel and may
result in personal injury.
5. Lower machine from jack stands. Torque lug nuts
from 85 to 100 ft--lb (115 to 135 N--m).
6. Make sure drain plug is installed in bottom of brake
assembly (Fig. 8). Fill planetary wheel drive/brake assembly with SAE 85W--140 gear lube. Capacity is
approximately 16 fl. oz. (0.47 liters) per wheel.
7. Check and adjust brake cables for proper brake operation.
1

3. Chock rear wheels and jack up front of machine (see
Jacking Instructions in Chapter 1 -- Safety). Support machine with jack stands.
4. Remove front wheel assembly.

6. Remove brake assembly (see Brake Assembly Removal in this section).
7. Support planetary assembly to prevent it from falling.
Loosen and remove flange head screws that secure
planetary assembly to frame. Remove planetary assembly from machine.
Installation (Fig. 7)

Figure 8
1. Brake housing
2. Check plug

3. Drain plug

1. Position planetary assembly to machine. Install
flange head screws that secure planetary assembly.
Torque screws in a crossing pattern from 75 to 85 ft--lb
(101 to 115 N--m).

Groundsmaster 4000--D/4010--D

Page 6 -- 11

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

5. Remove hydraulic wheel motor (see Front Wheel
Motors in the Service and Repairs section of Chapter 4
-- Hydraulic System).

Planetary Wheel Drive Service

2
24

9 ft--lb
(12 N--m)

19
20
6
7

8
21
9
4

10
11

18
17
12

16
15

Figure 9
1.
2.
3.
4.
5.
6.
7.
8.

Spindle
Boot seal
Inner bearing cone
Inner bearing cup
Wheel stud (8 used)
Housing
Outer bearing cup
Outer bearing cone

Axles, Planetaries and Brakes

9.
10.
11.
12.
13.
14.
15.
16.

Thrust washer
Retaining ring (external)
Ring gear
Retaining ring (internal)
Plug (2 used)
End cap
Thrust plug
Thrust washer

Page 6 -- 12

17.
18.
19.
20.
21.
22.
23.
24.

Drive shaft
Carrier assembly
Socket head screw (16 used)
Lock washer (16 used)
O--ring
O--ring
Dowel pin (2 used)
Seal

Groundsmaster 4000--D/4010--D

NOTE: The planetary wheel drive assembly can be serviced with the planetary installed to machine. If the
spindle (item 1) needs to be removed from machine, see
Planetary Wheel Drive Assembly Removal in this section.

3
1

19
20

Disassembly (Figs. 9 and 10)

1. If planetary wheel drive assembly is installed on machine:

A. Park machine on a level surface, lower cutting
decks, stop engine and remove key from the ignition
switch.
16

B. Drain oil from planetary wheel drive/brake assembly.

C. Chock rear wheels and jack up front of machine
(see Jacking Instructions in Chapter 1 -- Safety).
Support machine with jack stands.

D. Remove front wheel assembly.

Figure 10

2. Remove retaining ring (item 12).

4. Remove drive shaft assembly (items 17).

Assembly (Figs. 9 and 10)
1. Thoroughly clean parts in solvent and dry completely
after cleaning. Inspect parts for damage or excessive
wear and replace as necessary.

5. Remove carrier assembly (item 18).

NOTE: Use new seal and shim kits when assembling
planetary wheel drive.

6. If wheel stud (item 5) removal is necessary, use
press to extract stud(s) from housing.

2. If spindle and housing were separated:

NOTE: Steps 6 through 10 are necessary only if inspecting or replacing bearings and/or seals.

A. Press bearing cups (items 4 and 7) into housing
(item 6). Cups should be pressed fully to shoulder of
the housing bore.

IMPORTANT: Do not reuse retaining ring (item 10)
after it has been removed.

B. Set inner bearing cone (item 3) into bearing cup
(item 4) that is installed in housing.

7. Remove retaining ring (item 10) and thrust washer
(item 9). Discard retaining ring.

C. Make sure that seal bore in housing is thoroughly
cleaned. If OD of seal (item 24) is not rubber or does
not have a sealant coating, apply light coating of silicone sealant to seal bore in housing. Install seal into
housing so it is flush with housing face. Lightly
grease seal lips.

8. Remove housing (item 6) from spindle (item 1). Remove outer bearing cone (item 8).
9. Remove and discard all seals and O--rings (items 2,
21 and 24).
10.If bearings will be replaced, remove inner bearing
cone (item 3) from housing. Remove bearing cups
(items 4 and 7) from housing.
11. If necessary, remove socket head screws (item 19)
with lock washers (item 20) that secure ring gear (item
11) to housing. Remove ring gear and two (2) dowel pins
(item 23) from housing.

Groundsmaster 4000--D/4010--D

Page 6 -- 13

D. Pack boot seal (item 2) with grease and install on
housing.
E. If ring gear was removed from housing, place
dowel pins (item 23) in housing. Secure ring gear to
housing with lock washers (item 20) and socket head
screws (item 19). Torque socket head screws to 9 ft-lb (12 N--m).

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

3. Remove end cap (item 14). Thrust plug (item 15) and
thrust washer (item 16) usually remain in end cap bore
and should be removed for cleaning and inspection.

F. Lightly oil bearing journals on spindle shaft. Slide
housing onto spindle (item 1) taking care to not damage seal or spindle. Make sure that bearing in housing fully seats against spindle shaft shoulder.

3. Install carrier assembly (item 18) making sure that
carrier gear teeth align with ring gear and spline on
spindle shaft.

G. Install outer bearing cone (item 8) onto spindle.

4. Install drive shaft (item 17) making sure that drive
shaft spline aligns with carrier gears.

NOTE: The planetary shim kit includes the retaining
ring and several thrust washers with thickness in incremental steps of 0.004 in. (0.10 mm).

5. Install thrust plug (item 15) and thrust washer (item
16) into end cap (item 14). Make sure that thrust plug
and thrust washer are captive on inside of end cap.

H. Measure thickness of thrust washer (item 9) that
was removed during disassembly. Choose new
thrust washer of equal thickness or the next available
thickness from thrust washers in the shim kit.

6. Install new O--ring (item 21) to end cap (item 14) and
then install end cap. Secure cap with retaining ring (item
12).

I. Apply a light coating of oil to spindle shaft, thrust
washer and retaining ring. Install thrust washer onto
spindle shaft.

WARNING
If retaining ring (item 10) is not fully installed in
spindle groove, loss of wheel and personal injury may result.
J. Carefully install new retaining ring (item 10) into
the spindle shaft groove taking care to not distort
ring. If the proper thrust washer has been installed,
the retaining ring should fit tightly between the thrust
washer and spindle groove. Tap the OD of the retaining ring starting in the center and working out toward each end to ensure that the retaining ring is
properly seated into the spindle groove. After correct
assembly, make sure that retaining ring ID is fully
seated to spindle shaft groove.

7. Check operation of planetary wheel drive. With a
constant turning force applied, rotation of the planetary
should be consistent. If there is more drag at certain
points, gears are not rolling freely and the planetary
should be examined for improper assembly or damaged
components.
8. If planetary wheel drive assembly is installed on machine:
A. Install wheel assembly.

WARNING
Failure to maintain proper wheel lug nut torque
could result in failure or loss of wheel and may
result in personal injury.

K. After retaining ring is installed, make sure that
there is no endplay in assembly. If required, remove
retaining ring and install a thrust washer of different
thickness to adjust endplay.

B. Lower machine from jack stands. Torque lug nuts
from 85 to 100 ft--lb (115 to 135 N--m).
C. Make sure drain plug is installed in bottom of
brake assembly. Fill planetary wheel drive/brake assembly with SAE 85W--140 gear lube. Capacity is
approximately 16 fl. oz. (0.47 liters) per wheel.

L. Install new O--ring (item 21) to housing.

Axles, Planetaries and Brakes

Page 6 -- 14

Groundsmaster 4000--D/4010--D

Axles, Planetaries
and Brakes

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 6 -- 15

Axles, Planetaries and Brakes

Rear Axle Assembly

RIGHT

FRONT

4
15

2
15

14
13

11
10
9

2
1

See text for
tightening
procedure

Figure 11
1.
2.
3.
4.
5.
6.
7.

Frame assembly
Cap screw (10 used)
Lock washer (6 used)
Flat washer (16 used)
Support frame
Thrust washer (thick)
Grease fitting

8.
9.
10.
11.
12.
13.
14.

Rear axle assembly
Thrust washer (thin)
Washer head screw
Pivot pin
Rear axle mount
Washer
Lock nut

Removal (Fig. 11)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

15.
16.
17.
18.
19.
20.

Flange nut (10 used)
Rear bumper
Hydraulic manifold (4WD)
Cap screw (2 used)
Flange nut (2 used)
Cap screw (6 used)

2. Chock front wheels and jack up rear of machine (see
Jacking Instructions in Chapter 1 -- Safety). Support machine with jack stands.
3. Drain oil from rear axle and axle gearbox.
4. Remove both wheels from rear axle.

CAUTION
When changing attachments, tires or performing other service, use correct jacks and supports. Make sure machine is parked on a solid,
level surface such as a concrete floor. Prior to
raising machine, remove any attachments that
may interfere with the safe and proper raising of
the machine. Always chock or block wheels. Use
jack stands to support the raised machine. If the
machine is not properly supported by jack
stands, the machine may move or fall, which
may result in personal injury.
Axles, Planetaries and Brakes

5. Remove hydraulic motor from rear axle assembly
(see Rear Axle Motor Removal in the Service and Repairs section of Chapter 4 -- Hydraulic System).
6. Remove steering cylinder from rear axle (see Steering Cylinder Removal in the Service and Repairs section
of Chapter 4 -- Hydraulic System).
7. Disconnect both steering cylinder hydraulic hoses
from hydraulic tubes at rear axle mount bracket (Fig.
12). Remove bulkhead lock nuts that secure steering
cylinder hydraulic tubes to bracket. Separate tubes from
axle mount bracket.

Page 6 -- 16

Groundsmaster 4000--D/4010--D

8. Remove cap screw and flange nut that secures front
corner of 4WD hydraulic manifold to rear axle mount
bracket.

1
2
3

9. If required, remove tie rod ends from steering arms
on rear axle (Fig. 13). Remove the cotter pins and castle
nuts from the tie rod ball joints. Use a ball joint fork and
remove the tie rod ends from the axle steering arms.
10.Support rear axle to prevent it from falling. Remove
six (6) cap screws, flat washers and flange nuts that secure rear axle mount to equipment frame. Lower rear
axle and rear axle mount from machine.
11. Remove lock nut and washer from pivot pin that attaches rear axle to rear axle mount. Remove washer
head screw that secures flange of pivot pin to axle mount
(Fig. 14).
12.Remove pivot pin. Separate rear axle mount from
rear axle. Note location of thrust washers on both ends
of axle mounting boss.

Figure 12
1. Hydraulic hose
2. Hydraulic hose
3. Hydraulic tube

Installation (Fig. 11)

4. Hydraulic tube
5. Axle mount bracket

1. Position rear axle mount to axle. Install thrust washers between axle boss and axle mount. The thinner
thrust washer should be installed on the hydraulic motor
end of the axle (toward the rear of the machine). With
washers installed, there should be from 0.002” to 0.020”
(0.05 mm to 0.51 mm) clearance between rear axle
mount and axle mounting boss. Add thrust washers if
needed to adjust clearance.
2. Install axle pivot pin to secure axle to rear axle
mount. Install washer and lock nut onto pivot pin. Tighten lock nut and then loosen it slightly to allow the axle
pin to pivot freely. Secure pivot pin to axle mount with
washer head screw (Fig. 14).

Figure 13
1. Tie rod
2. Dust cover
3. Cotter pin

4. Castle nut
5. Tie rod end
6. Steering arm (LH)

4. Secure rear axle mount to frame with six (6) cap
screws, flat washers and flange nuts.

Axles, Planetaries
and Brakes

3. Position axle and rear axle under machine. With a
jack, raise assembly to machine frame and align mounting holes of rear axle mount and machine frame.
2

5. Install cap screw and flange nut that secures front
corner of 4WD hydraulic manifold to rear axle mount
bracket.
6. If removed, install the tie rod to rear axle (Fig. 13).
Tighten ball joint castle nuts and install new cotter pins.
7. Attach steering cylinder hydraulic tubes to rear axle
mount bracket with washers and bulkhead lock nuts
(Fig. 12). Install steering cylinder hoses to hydraulic
tubes.

Groundsmaster 4000--D/4010--D

Figure 14
1. Pivot pin

Page 6 -- 17

2. Washer head screw

Axles, Planetaries and Brakes

8. Install steering cylinder to axle assembly (see Steering Cylinder Installation in the Service and Repairs section of Chapter 4 -- Hydraulic System).
9. Install hydraulic motor to axle assembly (see Rear
Axle Motor Installation in the Service and Repairs section of Chapter 4 -- Hydraulic System).

2
1

WARNING
Failure to maintain proper wheel lug nut torque
could result in failure or loss of wheel and may
result in personal injury.
Figure 15

10.Install wheels to axle.
11. Lower machine to ground. Torque wheel lug nuts
from 85 to 100 ft--lb (115 to 135 N--m).

1. Steering stop bolt

2. Bevel gear case (LH)

12.Fill axle with SAE 85W--140 weight gear lube. Lubricant capacity is approximately 80 fl. oz. (2.37 liters) for
the axle and 16 fl. oz. (0.47 liters) for the gearbox.
13.Check rear wheel toe--in and adjust if necessary.
14.Check steering stop bolt adjustment. When the
steering cylinder is fully extended (right turn), a gap of
1/16” (1.6 mm) should exist between bevel gear case
casting and stop bolt on left axle case. Figure 15 shows
stop bolt location.

Axles, Planetaries and Brakes

Page 6 -- 18

Groundsmaster 4000--D/4010--D

Axles, Planetaries
and Brakes

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 6 -- 19

Axles, Planetaries and Brakes

Rear Axle Service

10
11
22

21
24

18
19

8
2

9
25

12
5

6
33

7
27

44
45

8
61

46
47

37
22

38
40

53
8

30
31

54
51

Figure 16

Axles, Planetaries and Brakes

Page 6 -- 20

Groundsmaster 4000--D/4010--D

Figure 16 (Continued)
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.

LH axle support
Flange bushing (2 used)
Axle vent
O--ring
Vent extension
Cap screw (4 used per gear case)
Shim set
Seal washer
Plug
Lock nut
Lock washer
Grease fitting
Ball bearing
Screw (2 used per steering arm)
Axle case support (LH shown)
Bolt (2 used)
Stud (2 used)
Shim set
Differential assembly
O--ring
Plug

22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.

O--ring
RH axle support
Input shaft assembly
Bolt (8 used)
O--ring
Differential shaft (LH shown)
Shim set
Ball bearing
Bevel gear (15 tooth)
Retaining ring
Bolt (4 used per knuckle)
Shim set
Dowel pin (2 used per axle case)
Bushing
Knuckle pin
O--ring
Bevel gear case (LH shown)
Bushing
Shaft seal
Stud (2 used per gear case)
Bolt (4 used per cover)

43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
63.

Collar
Bevel gear (17 tooth)
Bevel gear shaft
Axle case (LH shown)
Ball bearing
Bevel gear (29 tooth)
Shim set
Clip (2 used per axle case)
Axle cover
Screw (6 used per cover)
Wheel stud (5 used per axle)
Axle
Oil seal
Ball bearing
O--ring
Retaining ring
Spacer
Axle case cover
Seal washer
Plug
Bevel gear (17 tooth)

Axles, Planetaries
and Brakes

NOTE: Figure 16 illustrates the rear axle used on the
Groundsmaster 4000--D and 4010--D. Service procedures for the rear axle is on the following pages of this
section.

Groundsmaster 4000--D/4010--D

Page 6 -- 21

Axles, Planetaries and Brakes

Bevel Gear Case and Axle Case
The following procedures assume the rear axle assembly has been removed from the machine.

35 to 41 ft--lb
(47 to 56 N--m)

Removal

1. Remove the mounting screws, nuts and lock washers. Remove the bevel gear case/axle case assembly
and O-ring from the axle support (Fig. 17).
4

2. Mark both right and left bevel gear case/axle case
assemblies.

3
35 to 41 ft--lb
(47 to 56 N--m)

IMPORTANT: Do not interchange right and left bevel gear case/axle case assemblies.

Figure 17
1.
2.
3.
4.

Cap screw (4 used)
Lock nut (2 used)
Lock washer (2 used)
Axle support

5. Bevel gear case/axle
case assembly
6. O-ring

3. Remove the axle cover mounting screws. Remove
the axle cover from the axle case as an assembly
(Fig. 18).

17 to 20 ft--lb
(23 to 27 N--m)
1

4
3

Figure 18
1. Axle case
2. Axle cover assembly

4. Remove the axle case support mounting screws, the
axle case support and the support shims (Fig. 19).

3. Screw (6 used)
4. O-ring

Thread--locking
Compound

57 to 67 ft--lb
(77 to 91 N--m)

Figure 19
1. Axle case
2. Axle case support

Axles, Planetaries and Brakes

Page 6 -- 22

3. Screw (2 used)
4. Support shim

Groundsmaster 4000--D/4010--D

5. Remove the knuckle pin mounting screws and the
knuckle pin. Remove the gasket and any remaining gasket material from either mating surface (Fig. 20).
6. While holding the bevel gear case, tap the upper end
of the bevel gear shaft out of the upper bearing and upper bevel gear.

17 to 20 ft--lb
(23 to 27 N--m)

Thread--locking
Compound

7. Pull the bevel gear case from the axle case and remove the upper bevel gear and collar from the gear
case.

8. Remove the axle case cover screws, cover and the
O-ring from the axle case.

9. Remove the plug and sealing washer from the center
of the axle case cover. While holding the axle case cover, lightly tap the lower end of the bevel gear shaft out of
the lower bearing and lower bevel gear.

10.Remove and discard bevel gear shaft seal from axle
case (Fig. 20).
13

12
10
17 to 20 ft--lb
(23 to 27 N--m)

Figure 20
1.
2.
3.
4.
5.
6.
7.
8.

Knuckle pin
Mounting screw (4 used)
O--ring
Bevel gear case
Upper bearing
Bevel gear shaft
Collar
Upper bevel gear

9.
10.
11.
12.
13.
14.
15.

Lower bevel gear
Lower bearing
Axle case
Axle case cover
O-ring
Shaft seal
Bushing

1. Measure the knuckle pin O.D. and the axle case support bushing I.D. to determine the bushing to pin clearance (Fig. 21). Replace components as necessary.

Axles, Planetaries
and Brakes

Inspection
1
2

BUSHING TO PIN CLEARANCE:
0.002 to 0.016 in. (0.05 to 0.40 mm)
KNUCKLE PIN O.D. (Factory Spec.):
0.982 to 0.983 in. (24.95 to 24.98 mm)
AXLE CASE SUPPORT BUSHING I.D.
(Factory Spec.):
0.984 to 0.987 in. (25.00 to 25.08 mm)

Figure 21

2. Inspect all gears, shafts, bearings, cases and covers
for damage and wear. Replace components as necessary.

Groundsmaster 4000--D/4010--D

1. Knuckle pin

Page 6 -- 23

2. Axle case support

Axles, Planetaries and Brakes

Installation
1. Coat new shaft seal with grease and install in axle
case as shown (Fig. 22).
3
2

Figure 22
1. Axle case
2. Bevel gear case

2. Install the lower bevel gear and bevel gear shaft in
the axle case cover. Coat a new O-ring with grease and
install the axle case cover (Fig. 23). Tighten cover
screws from 17 to 20 ft-lb (23 to 27 N--m).

3. Shaft seal

7
8

3. Slide the bevel gear case over the bevel gear shaft
and install the bevel gear and collar. Make sure the bevel
gear shaft is completely seated in the upper and lower
bearings (Fig. 23).

4. Install the knuckle pin. Use medium strength thread-locking compound and tighten the knuckle pin mounting
screws from 17 to 20 ft-lb (23 to 27 N--m).

2
1
4

Figure 23
1.
2.
3.
4.

Axles, Planetaries and Brakes

Page 6 -- 24

Axle case cover
Lower bevel gear
Bevel gear shaft
Lower bearing

5.
6.
7.
8.

Upper bevel gear
Collar
Upper bearing
Knuckle pin

Groundsmaster 4000--D/4010--D

5. Determine necessary quantity of support shims.
4

A. Lubricate the axle case support bushing with a
thin coat of grease and slide axle case support onto
knuckle pin.
B. Position support shims that were removed during
disassembly between axle case support and axle
case. Install mounting screws into axle case. Slowly
tighten screws while frequently checking for clearance (vertical endplay) between axle case support
and knuckle pin. If binding of components is noted
before screws are fully tightened, add additional support shims. Torque screws from 57 to 67 ft--lb (77 to
91 N--m).
C. Use dial indicator to measure vertical endplay of
axle case (Fig. 24).
AXLE CASE ASSEMBLY ENDPLAY:
0.001 to 0.008 in. (0.02 to 0.20 mm)

57 to 67 ft--lb
(77 to 91 N--m)
1

VERTICAL
ENDPLAY

Figure 24
1. Axle case support
2. Axle case
3. Bevel gearcase

D. Adjust endplay by increasing or reducing number
of axle case support shims.

4. Dial indicator
5. Knuckle pin
6. Support shim location

NOTE: Axle case support shims are available in
0.004 in. (0.1 mm), 0.008 in. (0.2 mm) and 0.016 in. (0.4
mm) thickness.

6. After correct support shims have been determined,
remove mounting screws, apply heavy strength thread-locking compound to screw threads, reinstall screws
and torque from 57 to 67 ft--lb (77 to 91 N--m).
5

IMPORTANT: Correct engagement between bevel
gears is critical to axle performance and durability.

Figure 25
1. Axle support
2. Upper bevel gear
3. Differential shaft gear

4. Dial indicator
5. Axle bearing shims

UPPER BEVEL GEAR BACKLASH:
0.004 to 0.016 in. (0.10 to 0.40 mm)

5
1

8. Adjust backlash by increasing or reducing axle bearing shim thickness (see Differential Shafts in this section
of this manual).
NOTE: Axle bearing shims are available in 0.004 in.
(0.1 mm), 0.008 in. (0.2 mm) and 0.020 in. (0.5 mm)
thickness.

Figure 26
1. Axle cover assembly
2. Lower bevel gear
3. Axle gear

Groundsmaster 4000--D/4010--D

Page 6 -- 25

4. Dial indicator
5. Axle bearing shims

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

7. Temporarily install the bevel gear case/axle case assembly on the axle support. Position a dial indicator at
the tooths center. Prevent the axle from turning and
measure the upper bevel gear to differential shaft gear
backlash (Fig. 25).

9. Remove the bevel gear case/axle case assembly
from the axle support. Coat a new O-ring with grease
and temporarily install the axle cover assembly. Position
a dial indicator at the tooths center. Prevent the axle
from turning and measure the lower bevel gear to axle
gear backlash (Fig. 26).
LOWER BEVEL GEAR BACKLASH:
0.004 to 0.016 in. (0.10 to 0.40 mm)
10.Adjust backlash by increasing or reducing axle bearing shim thickness (see Axle Shafts in this section of this
manual).

NOTE: Axle bearing shims are available in 0.008 in.
(0.2 mm), 0.012 in. (0.3 mm) and 0.020 in. (0.5 mm)
thickness.
11. Tighten axle cover screws from 17 to 20 ft-lb (23 to
27 N--m).
12.Coat a new O-ring with grease and install the bevel
gear case/axle case assembly on the axle support.
Tighten mounting screws and nuts from 35 to 41 ft-lb
(47 to 56 N--m) (Fig. 17).

Differential Shafts
The following procedures assume the rear axle assembly has been removed from the machine.

35 to 41 ft--lb
(47 to 56 N--m)

Removal

IMPORTANT: Do not interchange right and left differential shaft assemblies.
1. Remove the mounting screws, nuts and lock washers. Remove the bevel gear case/axle case assembly
and O-ring from the axle support (Fig. 27).

4. Drive the differential shaft out of the bearings. Remove the bearings and bearing shims.

2
3

35 to 41 ft--lb
(47 to 56 N--m)

2. Mark and pull the differential shaft assembly from the
axle support.
3. Remove the retaining ring and bevel gear (Fig 28).

Figure 27
1.
2.
3.
4.

Cap screw (4 used)
Lock nut (2 used)
Lock washer (2 used)
Axle support

5. Bevel gear/axle case
assembly
6. O-ring
7. Stud (2 used)

5. Inspect all gears, shafts, bearings and cases for
damage and wear. Replace components as necessary.
Installation
1. Press bearings onto differential shaft. Place correct
combination of bearing shims in axle support and drive
differential shaft and bearing assembly into axle support.

3
5
4

2. Install bevel gear and retaining ring.

3. Coat new O-ring with grease. Align differential shaft
splines with differential gear assembly and slide differential shaft assembly onto axle support.
4. Install bevel gear case/axle case assembly (see
Bevel Gear Case/Axle Case Assembly in this section of
this manual).

Axles, Planetaries and Brakes

Figure 28
1. Retaining ring
2. Bevel gear
3. Differential shaft

Page 6 -- 26

4. Bearing
5. Bearing shims
6. O-ring

Groundsmaster 4000--D/4010--D

Axle Shafts
The following procedures assume the rear axle assembly has been removed from the machine.

17 to 20 ft--lb
(23 to 27 N--m)
1

Removal
1. Remove the axle cover mounting screws. Remove
the axle cover from the axle case as an assembly
(Fig. 29).

4
3

2. Use a bearing puller to remove the bearing and bevel
gear as shown (Fig. 30).
3. Remove the shims, spacer and retaining ring. Drive
the axle out of the bearing and cover. Remove and discard the axle shaft seal.
4. Inspect all gears, shafts, bearings, spacers and
cases for damage and wear. Replace components as
necessary.

Figure 29
1. Axle case
2. Axle cover assembly

3. Screw (6 used)
4. O-ring

Installation

1. Coat new axle shaft seal with grease and install in
axle cover as shown (Fig. 31).

2. Press the axle cover and bearing assembly onto the
axle shaft. Press only on the inner race of the cover
bearing (Fig. 31).

3. Install retaining ring, spacer and correct combination
of bearing shims. Install bevel gear and bearing.

Figure 30
1. Bearing
2. Bevel gear
3. Shims

4. Spacer
5. Retaining ring

1
4
2

Figure 31
1. Axle shaft seal
2. Axle cover

Groundsmaster 4000--D/4010--D

Page 6 -- 27

3. Bearing
4. Axle shaft

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

4. Coat a new O-ring with grease and install the axle
cover assembly. Tighten axle cover screws from 17 to
20 ft-lb (23 to 27 N--m).

Input Shaft/Pinion Gear
35 to 41 ft--lb
(47 to 56 N--m)

1
3

20
19

8 7

10
14

10
9
13

35 to 41 ft--lb
(47 to 56 N--m)

Figure 32
1.
2.
3.
4.
5.
6.
7.

Nut (2 used)
Lock washer (2 used)
Stud (2 used)
Lock nut
Stake washer
Oil seal
O-ring

8.
9.
10.
11.
12.
13.
14.

Seal collar
Bearing
O-ring
Input shaft/pinion gear
Bearing case
Shim
Screw (2 used)

The following procedures assume the rear axle assembly has been removed from the machine.
Removal (Fig. 32)
1. Remove the cover plate, gasket and gear case assembly from the axle assembly. Remove the gasket and
any remaining gasket material.
2. Remove the retaining rings and the driven gear from
the input shaft/pinion gear.
3. Remove input shaft/pinion gear assembly from the
gear case. Remove the shims and bearing case Orings.

15.
16.
17.
18.
19.
20.

Gear case
Gasket
Cover plate
Dowel pin
Lock washer (6 used)
Cap screw (6 used)

NOTE: Replacement input shaft/pinion gear (item 11)
is only available in matched set with differential ring
gear.
Installation (Fig. 32)
NOTE: When installing bearing cones onto the input
shaft/pinion gear, press only on the inner race of the
bearing cone.
1. If the inner bearing cone was removed, press a new
bearing cone all the way onto the input shaft/pinion gear.
2. Place the shaft and bearing assembly in the bearing
case and install the outer bearing cone.

4. Release the stake washer and remove the lock nut.
Remove and discard the stake washer.

NOTE: The bearings must be completely seated.
There should be no input shaft/pinion gear end play.

5. Drive the input shaft/pinion gear out from the outer
bearing cone and bearing case. Remove and discard
the oil seal and O-ring.

3. Coat a new oil seal with grease and install as shown
(Fig. 33). The seal should be installed with the garter
spring towards the hydraulic motor location.

6. Inspect all gears, shafts, bearings, spacers and
cases for damage and wear. Replace components as
necessary.

4. Coat new O-ring with grease. Install O-ring in the oil
seal collar and install the collar.

Axles, Planetaries and Brakes

Page 6 -- 28

Groundsmaster 4000--D/4010--D

5. Install a new stake washer. Install the lock nut finger
tight.
6. Set the bearing preload by securing the bearing case
in a vise. Thread a M12 x 1.5 hex head cap screw into
the splined end of the input shaft/pinion gear and slowly
tighten the lock nut until 4 to 6 in-lb (0.4 to 0.7 N--m) of
force is required to rotate the input shaft/pinion gear in
the bearing case.

0.040 in. (1.0 mm)
2

7. Secure the lock nut with the stake washer.
8. Use a depth gauge to measure the distance from the
end face of the input shaft/pinion gear to the mating surface of the bearing case. Subtract the “Design Cone
Center Distance” from this distance to determine initial
shim thickness (Fig. 34).
DESIGN CONE CENTER DISTANCE
(distance from mating surface of axle support to end
face of pinion gear):
1.870 + 0.002 in. (47.5 + 0.05 mm)

Figure 33
1. Oil seal
2. Bearing case

3. Seal garter spring

NOTE: Bearing case shims are available in 0.004 in.
(0.1 mm) and 0.008 in. (0.2 mm) thickness.

Design
Cone Center
Distance

9. Coat new O-rings with grease and install the bearing
case in the gear case. Place shims on the gear case and
temporarily install gear case assembly into axle case.
Tighten mounting nuts and screws from 35 to 41 ft-lb
(47 to 56 N--m).

10.Insert a screwdriver through the drain plug hole to
hold ring gear and measure the pinion gear to ring gear
backlash (Fig. 35).
Figure 34
1. Input shaft/pinion gear

2. Bearing case

11. Adjust backlash by increasing or reducing gear case
shim thickness.
12.Check pinion gear to ring gear engagement (see Pinion Gear to Ring Gear Engagement in this section of this
manual).
13.Place the correct combination of shims on the gear
case. Tighten mounting nuts and screws from 35 to 41
ft-lb (47 to 56 N--m).

14.Install retaining rings and driven gear on input shaft/
pinion gear.

15.If the drive gear (on drive motor shaft) was removed,
install the retaining rings and drive gear on the motor
shaft.
16.Use a new gasket and install the cover plate. Use a
new O-ring and install the drive motor.

Groundsmaster 4000--D/4010--D

Figure 35
1. Axle case
2. Screwdriver

Page 6 -- 29

3. Dial indicator
4. Input shaft/pinion gear

Axles, Planetaries and Brakes

Axles, Planetaries
and Brakes

PINION GEAR TO RING GEAR BACKLASH:
0.004 to 0.016 in. (0.10 to 0.40 mm)

Differential Gear
The following procedures assume the rear axle assembly has been removed from the machine.

35 to 41 ft--lb
(47 to 56 N--m)

Removal
1. Remove bevel gear case/axle case assemblies (see
Bevel Gear Case/Axle Case Assembly in this section of
this manual).
IMPORTANT: Do not interchange right and left differential shafts assemblies.
2. Mark and pull the differential shaft assemblies from
the axle support.
3. Remove input shaft/pinion gear assembly, shims
and O-ring from the axle support (Fig. 36).
4. Remove the axle support case screws. Separate the
axle support halves and remove the O-ring.

2
5
4

7
6

35 to 41 ft--lb
(47 to 56 N--m)

Figure 36
1.
2.
3.
4.

Gear Case
Pinion Gear
Axle support (left)
Axle support (right)

5. Case screw (8 used)
6. Differential gear
7. O-ring

5. Remove the differential gear assembly, bearings and
adjusting shims from the axle case.

6. Drive the spring pin from the differential case with a
punch and hammer. Discard the spring pin (Fig. 37).

NOTE: Mark and arrange all components so they can
be reassembled in their original position.
7. Remove the differential pinion shaft, pinion gears
and pinion washers. Remove the differential side gears
and side gear shims. Remove the ring gear only if it will
be replaced (Fig. 38).
NOTE: Replacement ring gears are only available in
matched ring and pinion sets.

Figure 37
1. Differential case

2. Spring pin

1
3
2

Thread--locking
Compound

2
3
4

8
22 to 25 ft--lb
(30 to 34 N--m)

Figure 38
1.
2.
3.
4.

Axles, Planetaries and Brakes

Page 6 -- 30

Differential pinion shaft
Pinion gear
Pinion washer
Side gear

5.
6.
7.
8.

Side gear shims
Ring gear
Differential case
Bolt/washer (8 used)

Groundsmaster 4000--D/4010--D

Inspection
1. Measure the differential side gear O.D. and the differential case I.D. to determine the side gear to case
clearance (Fig. 39). Replace components as necessary.
SIDE GEAR TO CASE CLEARANCE:
0.002 to 0.012 in. (0.05 to 0.30 mm)
1

SIDE GEAR O.D. (Factory Spec.):
1.335 to 1.337 in. (33.91 to 33.95 mm)
DIFFERENTIAL CASE I.D. (Factory Spec.):
1.339 to 1.341 in. (34.00 to 34.06 mm)
2

2. Measure the differential pinion shaft O.D. and the
pinion gear I.D. to determine the pinion shaft to pinion
gear clearance (Fig. 40). Replace components as necessary.
PINION SHAFT TO PINION GEAR CLEARANCE:
0.001 to 0.010 in. (0.03 to 0.25 mm)
PINION SHAFT O.D. (Factory Spec.):
0.550 to 0.551 in. (13.97 to 13.10 mm)

Figure 39
1. Side gear

PINION GEAR I.D. (Factory Spec.):
0.551 to 0.552 in. (13.10 to 14.02 mm)

2. Differential case

3. Inspect all gears, shafts, bearings, cases and covers
for damage and wear. Replace components as necessary.

Axles, Planetaries
and Brakes

Figure 40
1. Pinion shaft

Groundsmaster 4000--D/4010--D

Page 6 -- 31

2. Pinion gear

Axles, Planetaries and Brakes

Installation

1. If the ring gear was removed from the differential
case, use medium strength Loctite thread locker and
tighten the mounting screws from 22 to 25 ft-lb (30 to
34 N--m).

2
1

2. Apply molybdenum disulfide lubricant (Three Bond
1901 or equivalent) to the splines and bearing surfaces
of the differential pinion gears, pinion washers and side
gears.
3. Install the side gear shims and side gears in their
original location in the differential case.
4. Place the differential pinion gears and pinion washers in their original location in the differential case. Temporarily install the differential pinion shaft.

Figure 41
1. Vise
2. Differential gear case

3. Dial indicator

More than 35% total tooth contact

5. Secure the differential case in a soft jawed vise. Position a dial indicator on a tooth of the differential pinion
gear. Press the pinion and side gear against the differential case and measure the pinion gear to side gear backlash (Fig. 41).
PINION GEAR TO SIDE GEAR BACKLASH:
0.004 to 0.016 in. (0.10 to 0.40 mm)

1/3 to 1/2 of entire width
from small end of tooth

6. Adjust backlash by increasing or reducing side gear
shim thickness.
NOTE: Side gear shims are available in 0.043 in. (1.10
mm), 0.047 in. (1.20 mm) and 0.051 in. (1.30 mm) thickness.
7. Apply gear marking compound, such as DyKemR
Steel Blue lightly over several gear teeth.
8. While applying a light load to either side gear, rotate
either pinion gear until the side gears have made one
complete revolution.
9. Ideal tooth contact should cover more than 35% of
each tooth surface. The contact area should be in the
center of each tooth and extend 1/3 to 1/2 way across
each tooth from the toe (small) end (Fig. 42).
10.Adjust side gear shims if necessary to correct tooth
contact. Recheck differential pinion gear to side gear
backlash if any changes are made.

Figure 42
12.Install differential gear assembly in right side axle
support half.
13.Coat a new o-ring with grease and install left side
axle support half. Tighten axle support case screws from
35 to 41 ft-lb (47 to 56 N--m).
14.Install input shaft/pinion gear assembly (see Input
Shaft/Pinion Gear in this section of this manual).
15.Coat new o-rings with grease, align differential shaft
splines with differential gear assembly and slide differential shaft assemblies onto axle support.
16.Install bevel gear case/axle case assemblies (see
Bevel Gear Case/Axle Case Assembly in this section of
this manual).

11. After backlash and tooth contact have been adjusted, align the hole in the differential pinion shaft with
the hole in the differential case and install a new spring
pin.

Axles, Planetaries and Brakes

Page 6 -- 32

Groundsmaster 4000--D/4010--D

Pinion Gear to Ring Gear Engagement
The final position of the pinion gear is verified by using
the gear contact pattern method as described in the following procedure.

PROFILE

TOP LAND

GEAR TOOTH DEFINITIONS (Fig. 43):
Toe -- the portion of the tooth surface at the end towards the center.

TOE

HEEL

Heel -- the portion of the gear tooth at the outer end.

LENGTHWISE
BEARING
ARC

Top Land -- top surface of tooth.
1. Paint the teeth of the ring gear, both drive and coast
side, with a gear marking compound, such as DyKemR
Steel Blue.

ROOT

Figure 43

2. Install the input shaft/pinion gear assembly into axle
case.

More than 35% total tooth contact

3. While applying a light load to the ring gear, rotate the
pinion gear in the direction of forward travel until the ring
gear has made one complete revolution.
Ideal tooth contact observed on the ring gear should
cover more than 35% of each tooth surface. The contact
area should be in the center of each tooth and extend 1/3
to 1/2 way across each tooth from the toe end (Fig. 44).

1/3 to 1/2 of entire width
from small end of tooth

Figure 44

Adjustments to the gear contact position are made by
moving the input shaft/pinion gear (bearing case shims)
or by moving the differential gear case (differential bearing shims) (Fig. 45).

NOTE: Bearing case shims are available in 0.004 in.
(0.10 mm) and 0.008 in. (0.20 mm) thickness.
Axles, Planetaries
and Brakes

NOTE: Differential bearing shims are available in
0.004 in. (0.10 mm), 0.008 in. (0.20 mm) and 0.016 in.
(0.40 mm) thickness.
Study the different contact patterns (Figs. 46 and 47)
and correct gear engagement as necessary.
2

NOTE: When making changes, note that two variables
are involved (see Gear Pattern Movement Summary in
this section of this manual).
Example: If the pinion gear to ring gear backlash is set
correctly to specifications and the bearing case shim is
changed to adjust tooth contact, it may be necessary to
readjust backlash to the correct specification before
checking the contact pattern.

Groundsmaster 4000--D/4010--D

Figure 45
1. Input shaft/pinion gear
2. Bearing case shims
3. Differential gear case

Page 6 -- 33

4. Differential bearing
shims

Axles, Planetaries and Brakes

Gear Pattern Movement Summary

Heel Contact

Base Contact

Every gear has a characteristic pattern. The illustrations
show typical patterns only and explain how patterns shift
as gear location is changed.
1. If contact is toward the heel or base of the gear (Fig.
46):
A. Install thicker or additional bearing case shim(s)
to move pinion shaft toward ring gear.

Figure 46

B. Install thinner or remove differential bearing
shim(s) to move ring gear backward.
C. Repeat until proper tooth contact and pinion gear
to ring gear backlash are correct.

Toe Contact

Tip Contact

2. If contact is toward the toe or tip of the gear (Fig. 47):
A. Install thinner or remove bearing case shim(s) to
move pinion shaft away from ring gear.
B. Install thicker or additional differential bearing
shim(s) to move ring gear forward.

Figure 47

C. Repeat until proper tooth contact and pinion gear
to ring gear backlash are correct.

Axles, Planetaries and Brakes

Page 6 -- 34

Groundsmaster 4000--D/4010--D

Chapter 7

Chassis
Table of Contents
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 1
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . . 2
Steering Tower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Front Deck Lift Arm . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Side Deck Lift Arm . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Side Deck Rear Arm Assembly . . . . . . . . . . . . . . . . 8
Lift Arm Joint Yoke . . . . . . . . . . . . . . . . . . . . . . . . . 12
Console Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operator Seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Operator Seat Service . . . . . . . . . . . . . . . . . . . . . . 18
Operator Seat Suspension . . . . . . . . . . . . . . . . . . 20
Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

General Information
Operator’s Manual

Chassis

Groundsmaster 4000--D/4010--D

Page 7 -- 1

Chassis

Service and Repairs
Steering Tower
39

RIGHT
FRONT

23
7

4
5
6

21
40
22
33
34
35
36
37

9
10

29
30
31

11
12
13
14

16 to 20 ft--lb
(22 to 27 N--m)

27
15
16
17

18
19

38
20

Figure 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

Hex nut
Flat washer
Steering wheel
Foam collar
Steering seal
External snap ring (2 used)
Knob
Steering tower cover
Steering shaft
Compression spring
Cap
Rod assembly
Extension spring
Tilt rod

Chassis

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

Lock nut (2 used)
Parking brake switch
Cotter pin
Brake pawl
Cotter pin
Lock nut (2 used)
Nut insert (10 used)
Flange head screw (10 used)
Flange bushing (2 used)
Thrust washer (as needed)
Temperature gauge
Plug
Snap ring location

Page 7 -- 2

28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Steering column
Cap screw (2 used)
Pivot hub (2 used)
Flange head screw (4 used)
Switch bracket
Flange nut (2 used)
Cap screw (2 used)
Steering tower
Phillips head screw (2 used)
Clevis pin
Steering valve
Steering wheel cover
Platform wire harness

Groundsmaster 4000--D/4010--D

Disassembly (Fig. 1)

Assembly (Fig. 1)

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

1. Assemble steering tower using Figure 1 as a guide.

B. If steering wheel was removed, torque hex nut
that secures steering wheel from 16 to 20 ft--lb (22
to 27 N--m).

Chassis

2. Disassemble steering tower as needed using Figure
1 as a guide.

A. Thrust washer(s) (item 24) on steering column
are used as needed to remove end play of steering
shaft.

Groundsmaster 4000--D/4010--D

Page 7 -- 3

Chassis

Front Deck Lift Arm
33

RIGHT

FRONT
37
60 to 70 ft--lb
(81 to 94 N--m)

36
30

90 to 100 ft--lb
(123 to 135 N--m)

150 to 175 ft--lb
(203 to 237 N--m)

39
28
29

18
1

20
21
22
23
2

38
19 40

14
11

24
8

7
6
5

10
9

4
3
28

Figure 2
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

Flange bushing
Ball joint
Lock nut (2 per mount)
Clevis pin
Height--of--cut chain
U--bolt
Hex nut (2 per u--bolt)
Flat washer (4 per u--bolt)
Lock nut (2 per u--bolt)
Lock nut
Grease fitting (45o)
Grease fitting
Slotted roll pin
Lift arm pin

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

Cotter pin
Upper lift pin
Grease fitting
Lift cylinder
Lock nut
Pin
Cap screw
Flat washer (2 per pin)
Lift arm (LH shown)
Jam nut
Hair pin
Ball joint mount
Cotter pin

Removal (Fig. 2)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
Chassis

28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Washer (4 per mount)
Cap screw (2 per mount)
Lock nut (2 used)
Switch mount
Sensing plate
Carriage screw (2 used)
Jam nut (2 per switch)
Washer (2 per switch)
Proximity switch
Carriage screw (2 used)
Flat washer (2 used)
Slotted hex nut
Lock nut (2 used)

2. Remove front cutting deck (see Front Cutting Deck
Removal in Chapter 8 -- Cutting Decks).

Page 7 -- 4

Groundsmaster 4000--D/4010--D

7. Install ball joint mount to ball joint with slotted hex nut.
Torque nut from 90 to 100 ft--lb (123 to 135 N--m) while
aligning cotter pin holes. Install cotter pin.

8. Install front cutting deck (see Front Cutting Deck
Installation in Chapter 8 -- Cutting Decks).
9. If ball joint was removed from lift arm, torque ball joint
jam nut from 150 to 175 ft--lb (203 to 237 N--m).
10.Lubricate lift arm grease fittings.
11. After assembly is completed, raise and lower the cutting deck to verify that hydraulic hoses and fittings do not
contact anything.
12.Check height--of--cut and deck pitch adjustment.

3. Chock rear wheels and jack up front of machine.
Support machine on jack stands.
4. Remove front wheel next to lift arm that is to be removed.

5. Remove cap screw, washers and lock nut that secure lift cylinder pin to lift arm. Remove pin and separate
lift cylinder and lift arm.
2

6. Remove lock nut that secures lift arm pin. Support lift
arm and slide pin from frame and lift arm. Remove lift
arm from frame.

0.870”
(22.1 mm)

7. Remove height--of--cut chain, ball joint mount and
ball joint from removed lift arm as required.
Installation (Fig. 2)

Figure 3

1. Position lift arm to frame and insert lift arm pin. Engage roll pin into frame slots and install lock nut on pin.
Torque lock nut from 60 to 70 ft--lb (81 to 94 N--m).

1. U--bolt

2. Height--of--cut chain

2. Align lift cylinder with lift arm. Slide pin through lift
arm and cylinder end. Secure pin with cap screw, washers and lock nut.

4. If sensing plate (item 32) was removed from lift arm,
secure plate fully forward in lift arm slot.

5. If height--of--cut chain u--bolt was removed from lift
arm, assemble u--bolt so that threaded portion extends
0.870” (22.1 mm) above mounting plate on lift arm (Fig.
3).
6. If removed, install ball joint to lift arm. Distance from
end of lift arm to center of ball joint should be from 2.210”
to 2.390” (56.1 to 60.7 mm) (Fig. 4). Make sure that ball
joint is horizontal and that stud is centered in ball joint.
Install deck before torquing ball joint jam nut (item 24).
Groundsmaster 4000--D/4010--D

Chassis

3. Install front wheel assembly and lower machine to
the ground. Make sure that wheel lug nuts are torqued
from 85 to 100 ft--lb (115 to 135 N--m).

2.210” to 2.390”
(56.1 to 60.7 mm)

Figure 4
1. Lift arm

Page 7 -- 5

2. Ball joint

Chassis

Side Deck Lift Arm
16 17 19 18

16 17

12
11
14
13
20
10
23
17

27
40

22
34
36

9 10

35
Anti--seize
Lubricant

77 to 96 ft--lb
(105 to 130 N--m)

34
3

Loctite #242

6
5

32
31

RIGHT

1
37

30 33

FRONT

38
37

Figure 5
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

Lift arm (LH shown)
Shoulder screw
Lift cylinder pin
Lift cylinder
Thrust washer
Flange nut
Pivot hub
Lift arm pivot shaft
Thrust washer
Cap screw
Spring pin
Cylinder pin
Rivet (2 per bumper)
Rubber bumper

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

Slotted roll pin
Lock nut
Flat washer
Latch (LH shown)
Thrust washer (2 per latch)
Flange head screw
Plastic grip
Cam bracket
Lock washer
Switch mount
Proximity switch
Sensing plate
Lock nut (2 per mount)

28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Washer (2 per switch)
Jam nut (2 per switch)
Flat washer (2 per plate)
Carriage screw (2 per plate)
Flange bushing
Lock nut (2 per plate)
Grease fitting
Flange bushing
Flange bushing
Bushing
Grease fitting
Screw (2 per mount)
Flat washer (2 per mount)

NOTE: There are not bushings in the frame to support
the lift arm pivot shaft (item 8) because the shaft is fixed
in place by a roll pin (item 15). The lift arm (item 1) and
pivot hub (item 7) rotate on the pivot shaft and have
bushings that can be serviced.
2

NOTE: Allowable clearance between lift arm pivot shaft
(item 8) and front frame bore (Fig. 6) is up to 0.025” (0.64
mm). Allowable clearance between lift arm pivot shaft
and rear frame bore is up to 0.070” (1.78 mm).

Figure 6
1. Front frame bore

Chassis

Page 7 -- 6

2. Rear frame bore

Groundsmaster 4000--D/4010--D

Removal (Fig. 5)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Remove side deck from lift arm (see Side Cutting
Deck Removal in Chapter 8 -- Cutting Decks).
3. Remove side deck rear arm assembly from pivot hub
(see Side Deck Rear Arm Assembly Removal in this
section).
4. Remove lift cylinder pin (item 3) that secures lift cylinder to lift arm.
5. Drive out slotted roll pin (item 15) that retains lift arm
pivot shaft. Discard roll pin.
6. Support lift arm and pull lift arm pivot shaft from lift
arm and frame. Locate and remove thrust washers (item
5) during pivot shaft removal.

5. Align lift cylinder with lift arm. Secure lift cylinder to
lift arm with lift cylinder pin (item 3).
6. Install side deck rear arm assembly (see Side Deck
Rear Arm Assembly Installation in this section).
7. If sensing plate (item 26) was removed from lift arm,
secure plate so it is rotated as far as possible toward
center of machine.
8. Position and install side cutting deck to machine (see
Side Cutting Deck Installation in Chapter 8 -- Cutting
Decks).
9. Lubricate lift arm grease fittings after assembly is
complete.
10.After assembly is completed, raise and lower the cutting deck to verify that hydraulic hoses and fittings do not
contact anything.

A. If pivot shaft is difficult to remove, fabricate a puller as shown in Figure 7.

3” x 12” (3/8” to 1/2” thick) plate steel

B. Attach puller to end of pivot shaft with the pictured
bolt and flat washer.
C. Drive pivot shaft from lift arm and frame with hammer.
7. Remove lift arm from machine.

Flat washer

9/16” hole

1/2” -- 13 UNC bolt

1” to 1 1/8”

Installation (Fig. 5)
1. Apply anti--seize lubricant to lift arm pivot shaft.
2. Position lift arm to frame with thrust washers properly
placed (Fig. 5). Slide pivot shaft into frame and lift arm
until roll pin holes in shaft and frame align.

Use hammer to drive
pivot shaft from lift arm

3. Install new slotted roll pin to secure lift arm pivot
shaft.

Figure 7
Chassis

4. If pivot hub was removed from pivot shaft, slide pivot
hub onto shaft. Apply Loctite #242 (or equivalent) to cap
screw threads and secure pivot hub with washer and
cap screw. Torque cap screw from 77 to 96 ft--lb (105
to 130 N--m).

Groundsmaster 4000--D/4010--D

Page 7 -- 7

Chassis

Side Deck Rear Arm Assembly
17

Loctite #271

27
16
24
22

29
25

44
43
33

28 49

40 31

34
35
35 36

30
41

18
19

RIGHT

21 42
38
23
20

270 to 330 in--lb
(31 to 37 N--m)

13
5

FRONT

11
3

6
1

45
10
46
7

Figure 8
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Cutting deck (LH shown)
Deck mount (LH shown)
Cap screw
Lock nut
Clevis pin
Hair pin
Spacer
Rod end
Jam nut
Cap screw (4 per arm)
Straight bushing
Spring shaft
Flat washer
Compression spring
Plastic bearing
Lock nut
Cap screw

Chassis

18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

Pivot shaft
Retaining ring
Thrust washer (2 per arm)
Flange bushing
Rear arm (LH shown)
Lock nut (2 per damper)
Lock washer
Lock nut
Bumper pad (5 per arm)
Bumper mount
Cap screw
Bell crank (LH shown)
Damper
Damper rod end (2 per damper)
Cap screw (2 per damper)
Link tube

Page 7 -- 8

34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.

Lock nut
Flat washer
Bushing
Damper spring
Lock nut (4 per arm)
Carriage screw (2 per arm)
Grease fitting
Jam nut
Lock nut (2 per arm)
Jam nut (2 per arm)
Rod end (2 per arm)
Plate
Cap screw (8 used)
Lock washer (8 used)
Flat washer (8 used)
Spacer

Groundsmaster 4000--D/4010--D

Rear Arm Removal (Fig. 8)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Remove hair pin and clevis pin that connects damper
link to cutting deck (Fig. 9).

10.Thoroughly pack spring with grease. Install spring
shaft assembly into housing and secure plate with four
(4) cap screws and lock nuts.
11. Thread rod end (item 8) with jam nut (item 9) into end
of spring shaft. Do not tighten jam nut at this time.

3. Remove cap screw and lock nut that secures rod end
of rear arm to cutting deck. Locate and remove spacer
from each side of rod end.

12.If rod ends (item 31) were removed from damper
(item 30), apply Loctite #271 (or equivalent) to damper
shaft threads before installing rod ends. Secure damper
to bellcrank and rear arm with cap screws and lock nuts.
Torque fasteners from 270 to 330 in--lb (31 to 37 N--m).

4. Remove lock nut and lock washer that secures rear
arm pivot shaft. Slide pivot shaft from hub and rear arm.
Remove rear arm assembly from machine.

13.If damper link was disassembled, adjust the length
of the link from 5.295” to 5.445” (134.5 to 138.3 mm)
(Fig. 9).

Rear Arm Disassembly (Fig. 8)

14.If damper springs (item 37) were removed, tighten
lock nuts so that bushings (item 36) are free to rotate.

1. Disassemble rear arm assembly using Figure 8 as a
guide.
Rear Arm Assembly (Fig. 8)
1. Slide large flat washer, spring, plastic bearing, second large flat washer and small flat washer onto spring
shaft. Loosely secure components to shaft with one jam
nut.

2. Slide the straight bushing and plate onto other end
of spring shaft.

5.295” to 5.445”
(134.5 to 138.3 mm)

3. While holding flats on end of spring shaft, rotate jam
nut (on other end of assembly) until components are
snug but spring is not compressed.
2

4. Insert assembly into rear arm housing.
5. From open end of rear arm housing, insert a 3/4”
socket onto spring shaft jam nut. Tighten jam nut fully.
6. Mount plate to rear arm housing with two (2) cap
screws and lock nuts. Grasp end of spring shaft. Push
inward and pull outward on shaft to determine endplay
in assembly.

Figure 9
1. Damper link assembly

2. Clevis pin

IMPORTANT: All endplay must be removed from assembly to allow proper operation and ensure long life.
Chassis

7. Loosen jam nut, 1/2 turn at a time, until all endplay
in shaft is removed.
8. Remove two (2) cap screws and nuts securing plate
to rear arm housing. Remove spring shaft assembly
from housing.
9. Thread remaining jam nut onto end of spring shaft
and, while retaining inner jam nut to prevent it from moving, torque outer jam nut from 22 to 28 ft--lb (30 to 37
N--m) to lock adjustment.

Groundsmaster 4000--D/4010--D

Page 7 -- 9

Chassis

Rear Arm Installation (Fig. 8)
1. Position rear arm assembly to cutting deck and
frame.
2. Slide pivot shaft through rear arm clevis and hub. Secure pivot shaft with lock washer and lock nut.
3. Connect damper link to cutting deck with clevis pin
and hair pin (Fig. 9).
4. Position spacers on both sides of rod end of rear arm
assembly. Secure rod end of rear arm assembly to deck
mount with cap screw and lock nut.

Figure 10

5. Lubricate rear arm grease fittings.
6. Align cutting deck to traction unit as follows:
A. Make sure the machine is on a level, hard surface.
B. Place a square or straight edge against the deck
weldment that contains the castor fork assembly
(Fig. 10). Do not use the castor fork assembly itself.
C. Measure from the inset bead of the rim (not the
outer edge of the rim) to the straight edge at two locations as indicated in Figure 10. Rim and paint irregularities make the rim outer edge an unreliable point of
measure. These two measurements should be the
same within a tolerance of 1/8” (3 mm).
D. Rotate spring shaft (item 12) in rear arm assembly until correct dimension is attained. Shaft should
rotate freely inside the assembly. All adjustments
must be made with the rod end of the rear arm bolted
to the deck.
E. Raise and lower the deck and recheck dimensions for correct alignment.
F. When deck is properly aligned to traction unit,
tighten rod end jam nut (item 9).
NOTE: Due to differences in turf conditions and the
counterbalance setting of traction unit, it is advised that
turf be cut and appearance checked before formal cutting is started. Refer to Operator’s Manual for correcting
cutting deck mismatch procedures.

Chassis

Page 7 -- 10

Groundsmaster 4000--D/4010--D

Chassis

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 7 -- 11

Chassis

Lift Arm Joint Yoke

150 to 180 ft--lb
(203 to 244 N--m)

12
21
17

11
11

RIGHT
FRONT

10
1

5
19
6

Figure 11
1.
2.
3.
4.
5.
6.
7.

Side cutting deck (LH shown)
Deck mount (LH shown)
Retaining ring (2 used per deck)
Lock nut
Plate
Rubber plate
Cap screw

8.
9.
10.
11.
12.
13.
14.

Flat washer (8 used per mount)
Joint yoke
Spacer
Thrust washer (0.125” thickness)
Hardened washer
Cotter pin
Slotted hex nut

Removal (Fig. 11)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Remove cap screw (item 19) and lock nut (item 20)
that secures rod end of rear arm assembly to cutting
deck. Locate and remove spacer (item 18) from each
side of rod end.

15.
16.
17.
18.
19.
20.
21.

Cap screw (8 used per mount)
Lock washer (8 used per mount)
Rear arm assembly
Spacer
Cap screw
Lock nut
Thrust washer (0.032” thickness)

4. Remove cotter pin from joint yoke shaft. Make sure
that deck mount is supported and remove slotted hex
nut that secures joint yoke to lift arm. Take hardened
washer (item 12) and thrust washers (items 21 and 11)
from joint yoke shaft. Slowly raise lift arm enough to free
joint yoke from lift arm. Remove thrust washer (item 11)
and spacer (item 10) from yoke shaft.
5. Lift joint yoke and deck mount from lift arm and cutting deck.

3. Remove eight (8) cap screws, lock washers and flat
washers that secure deck mount to cutting deck (Fig.
12).
Chassis

Page 7 -- 12

Groundsmaster 4000--D/4010--D

Joint Yoke Disassembly
1. Remove retaining rings from yoke and deck mount.
IMPORTANT: Support yoke when removing cross
and bearings to prevent yoke damage.
2. Use a press to remove yoke from deck mount:

5. Install retaining rings to yoke and deck mount to secure bearings in place.
6. Make sure that assembled joint yoke moves without
binding. Slight binding can usually be eliminated by
lightly rapping the yoke lugs with a soft faced hammer.
If binding continues, disassemble joint yoke and deck
mount to identify and eliminate source of binding.

A. Place a small socket against one bearing in the
deck mount and a large socket on the opposite side
of the mount.

Installation (Fig. 11)

B. While supporting the large socket, apply pressure on small socket to partially push the opposite
bearing into the large socket.

2. Secure deck mount to deck with eight (8) cap screws,
lock washers and flat washers (Fig. 12).

C. Remove assembly from press, grasp partially removed bearing and tap on yoke to completely remove the bearing.
D. Repeat process for remaining bearing.
E. Remove yoke from mount.
3. Use a press and the above process to remove bearings and cross from yoke.
4. Thoroughly clean and inspect all components.

1. Position joint yoke with deck mount to cutting deck.

3. Place spacer washer (chamfered ID side down) and
then thrust washer (item 11) onto joint yoke shaft. Insert
yoke shaft up through lift arm bushings. Place additional
thrust washers (items 11 and 21) and then hardened
washer (item 12) on yoke shaft and secure with slotted
hex nut. Torque nut from 150 to 180 ft--lb (203 to 244
N--m) while aligning hole in shaft with slot in nut. Install
cotter pin.
4. Position spacers on both sides of rod end of rear arm
assembly. Secure rod end of rear arm assembly to deck
mount with cap screw and lock nut.
5. Grease joint yoke and lift arm bushings after installation on machine.

Joint Yoke Assembly
1. Make sure that rubber plate (item 6) and plate (item
5) are positioned in bottom of deck mount.
2. Apply a coating of grease to bearing bores of yoke
and deck mount. Also, apply grease to bearings and
seal of bearing assembly. Make sure that all bearing rollers are properly seated in bearing cage.

6. After assembly is completed, raise and lower the cutting deck to verify that hydraulic hoses and fittings do not
contact anything.

2
3

3. Use a press to install cross and bearings into yoke.

A. Press one bearing partially into yoke.
IMPORTANT: Take care when installing cross
into bearing to avoid damaging bearing seal.
B. Carefully insert cross into bearing and yoke.

D. Carefully place second bearing into yoke bore
and onto cross shaft. Press bearing into yoke.
4. Use a press and the above process to install deck
mount to yoke.

Groundsmaster 4000--D/4010--D

Chassis

C. Hold cross in alignment and press bearing in until
it hits the yoke.
Figure 12
1. Lift arm (RH shown)
2. Joint yoke
3. Rear arm assembly

Page 7 -- 13

4. Deck mount
5. Cap screw/washers

Chassis

Console Arm

40
32

28
27

1
18

6
13

16
22

26
11

RIGHT

8
7

FRONT

7
45

Figure 13
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.

Flange nut (3 used)
Flange head screw (2 used)
Foam seal
Washer head screw (10 used)
LH cover
Hi--low speed switch
Lock nut (3 used)
Throttle control
Control arm
Diagnostic light
Ignition switch
Button plug
Screw (2 used)
Warning lamp (oil pressure/charge)
Temperature gauge

Chassis

16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.

Warning lamp (glow plug/temp)
PTO switch
Hole plug
Flow divider switch
Nut
Flange nut (2 used)
Flange head screw (5 used)
Clip (2 used)
Bracket
U--nut (4 used)
Lock washer
Rivet (2 used)
Switch panel
Arm rest
Power point

Page 7 -- 14

31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.

Cap
Engine cooling fan control switch
Nut
Lift/lower switch (3 used)
Hour meter
RH cover
Cap screw (2 used)
Spacer (2 used)
Cover plate
Flange head screw (2 used)
R--clamp
Audio alarm
Screw
Hole plug (GM4000--D)
Headlight switch (GM4010--D)

Groundsmaster 4000--D/4010--D

Disassembly (Fig. 13)
1. Park machine on a level surface, lower cutting units,
stop engine and engage parking brake. Remove key
from ignition switch.
2. Remove two (2) flange head screws (item 40) and
then cover plate (item 39) from outside of console arm.
Locate and retrieve two (2) spacers (item 38).
3. At front of console arm, remove screw (item 43) and
lock nut (item 7) that secure console arm covers to each
other.

1
5
12
5
13
11
10

5. Remove console arm covers from machine. As LH
cover (item 5) is removed from console arm, unplug wire
harness connector from headlight switch if equipped.

7. If necessary, remove console panel and supports
from machine using Figures 13 and 14 as guides.

4. Remove five (5) washer head screws (item 4) that
secure each cover to console arm panel.

6. Remove electrical components from console arm as
needed using Figure 13 as a guide.

Figure 14
1.
2.
3.
4.
5.
6.
7.

Flat washer
Seat belt buckle
Coupling nut
Spacer
Carriage screw (5 used)
Cap screw
Cap screw

8.
9.
10.
11.
12.
13.

Arm support
Grommet
Cap screw
Flange nut (5 used)
Support channel
Support bracket

Assembly (Fig. 13)
1. Install all removed electrical and console arm components using Figure 13 and 14 as guides.
2. Position covers to console arm. As LH cover (item 5)
is placed, plug wire harness connector to headlight
switch if equipped.
3. Secure each cover to console arm with five (5) washer head screws (item 4). Install screw (item 43) and lock
nut (item 7) to secure covers at front of console arm.

Chassis

4. Position cover plate and spacers to outside of console arm. Secure with two (2) flange head screws.

Groundsmaster 4000--D/4010--D

Page 7 -- 15

Chassis

Operator Seat
37

35
33

38
20

34
26

32
5
18 19

31
30

29
28

21
22

6
23

3
7

10
12
11
13

RIGHT
FRONT

Figure 15
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.

Platform
Clevis pin (2 used)
Hair pin (2 used)
Seat plate
Grommet
Cotter pin (2 used)
Latch shaft
Cap screws (4 used)
Latch
Torsion spring
Prop rod
Flange nut (4 used)
Cotter pin (2 used)

Chassis

14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.

Flat washer (2 used)
Flat washer (4 used)
R--clamp (2 used)
Seat belt mount
Button head screw
Seat belt
Flat washer (5 used)
Lock washer
Lock nut
Cap screw
Manual tube
R--clamp (2 used)
Screw (2 used)

Page 7 -- 16

27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.

Seat and suspension assembly
Cap screw
Flange nut (5 used)
Support bracket
Support channel
Carriage screw (5 used)
Cap screw
Grommet
Arm support
Spacer
Cap screw
Coupler nut
Seat belt latch

Groundsmaster 4000--D/4010--D

Removal (Fig. 15)

B. Secure console arm support (item 35) to coupler
nut (item 38) with cap screw (item 37).

1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.

C. Place flat washer (item 20), seat belt latch (item
39) and spacer (item 36) between seat and console
arm support (item 35). Secure with cap screw (item
33) and second flat washer (item 20).

2. Disconnect seat electrical connector from machine
wire harness (Fig. 16).

D. Fully tighten all fasteners to secure console arm
assembly to seat.

3. Support console arm assembly to prevent it from
shifting.
4. Remove flange nut (item 29) and carriage screw
(item 32) that secure support bracket (item 30) to support channel (item 31).

4. Connect seat electrical connector to machine wire
harness (Fig. 16).

5. Remove cap screw (item 37) that secures console
arm support (item 35) to coupler nut (item 38).

1
2

6. Remove cap screw (item 33), flat washers (item 20),
spacer (item 36) and seat belt latch (item 39) from seat
and console arm support (item 35).
IMPORTANT: Make sure to not damage the electrical harness, control cable or other parts while moving the console arm assembly.

7. Carefully move console arm assembly away from
seat.
8. Remove four (4) torx head screws that secure seat
to seat suspension (Fig. 17). Note that the screw near
the seat adjustment handle is longer than the other three
(3) screws.

Figure 16
1. Operator seat
2. Seat switch connector

3. Suspension connector

9. Lift seat from seat suspension and remove from machine.
NOTE: Refer to Operator Seat Suspension in this section if seat suspension service is necessary.

Installation (Fig. 15)
1. Carefully position seat to seat suspension.
2. Secure seat to seat suspension with four (4) torx
head screws (Fig. 17). Make sure that longer screw is
positioned near the seat adjustment handle. Torque
screws 18 ft--lb (25 N--m).
IMPORTANT: Make sure to not damage the electrical harness, control cable or other parts while moving the console arm assembly.

3. Position and secure console arm assembly to seat.
Install all fasteners before fully tightening them.
A. Secure support bracket (item 30) and support
channel (item 31) with flange nut (item 29) and carriage screw (item 32).

Groundsmaster 4000--D/4010--D

Chassis

18 ft--lb
(25 N--m)

Figure 17
1. Seat
2. Suspension assembly

Page 7 -- 17

3. Screw (M8x12) (3 used)
4. Screw (M8x16)

Chassis

Operator Seat Service

13
5

22
26
25
30

4
16

18
19
20

24
14

10
15

Figure 18
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.

Backrest cushion
Seat cushion
Armrest cover
LH armrest
Bushing (2 used)
Backrest
Plug (2 used)
Cable tie (3 used)
LH adjustment rail
Bumper (2 used)

Chassis

11.
12.
13.
14.
15.
16.
17.
18.
19.
20.

Washer
Cap screw (2 used)
Seat
Nut
Spring (2 used)
Magnet
Seat switch
Rivet (4 used)
Mounting plate
Return spring

Page 7 -- 18

21.
22.
23.
24.
25.
26.
27.
28.
29.
30.

Torx screw (5 used)
RH adjustment rail
Rail stop
Torx screw
Torx screw (3 used)
Washer (3 used)
Handle
Nut
Support bracket
Cap screw

Groundsmaster 4000--D/4010--D

Disassembly (Fig. 18)

1. Disassemble operator seat as necessary using Figures 18 and 19 as guides.

Assembly (Fig. 18)
1. Assemble operator seat using Figures 18 and 19 as
guides.

7 11

Figure 19
Operator seat
R--clamp
Screw
Manual tube
Button head screw
Seat belt

7.
8.
9.
10.
11.

Flat washer
Lock nut
Cap screw
Lock washer
Seat belt mount

Chassis

1.
2.
3.
4.
5.
6.

Groundsmaster 4000--D/4010--D

Page 7 -- 19

Chassis

Operator Seat Suspension

RIGHT

16
17

FRONT

2
19
21

33
1

3
39

14
12

6
15

36
8

26
33
11
34

Figure 20
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.

Cover
Cover
Level control
Air control valve
Shock absorber
Air spring
Air tube assembly
Wire harness
Compressor
Bellows
Stop
Bumper set (2 used)
Roller (4 used)

Chassis

14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.

Washer (2 used)
Tether
Rivet (2 used)
Washer (4 used)
C--clip (4 used)
Pin (2 used)
Rivet (2 used)
Washer (3 used)
Screw (2 used)
Washer
Housing support (4 used)
Spacer (4 used)
Hose nipple

Page 7 -- 20

27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.

Clamp (2 used)
Hose nipple
Screw
Handle
Bumper
Nut
Plastic plug (23 used)
Screw (2 used)
Roller (2 used)
Screw (4 used)
Base plate
Suspension frame
Upper plate

Groundsmaster 4000--D/4010--D

NOTE: Most of the seat suspension components can
be serviced with the seat suspension base mounted to
the frame platform. If the air spring assembly (item 6) requires removal, the seat suspension base will have to be
removed from the seat platform.

1
2

Disassembly (Fig. 20)
1. Remove operator seat from seat suspension (see
Operator Seat Removal in this section).
2. Disconnect seat suspension connector from machine wire harness (Fig. 21).

3. If the air spring assembly (item 6) or base plate (item
37) requires removal, remove seat suspension from
seat plate (Fig. 22):
A. Raise and support seat plate assembly. Support
seat suspension to prevent it from falling.

Figure 21
1. Operator seat
2. Seat switch connector

B. Remove four (4) cap screws, flat washers and
flange nuts that secure seat suspension to seat
plate.

3. Suspension connector

C. Remove seat suspension from machine.
4. Remove seat suspension components as needed
using Figure 20 as a guide.

Assembly (Fig. 20)
1. Install all removed seat suspension components using Figure 20 as a guide.

2
4

2. If seat suspension was removed from seat plate, secure suspension to seat plate (Fig. 22):

A. Position seat suspension onto seat plate.
B. Secure seat suspension to seat plate with four (4)
cap screws, flat washers and flange nuts.
C. Lower and secure seat plate assembly.

Figure 22
1. Seat suspension
2. Flat washer (4 used)
3. Cap screw (4 used)

4. Flange nut (4 used)
5. Seat plate
6. R--clamp

3. Install operator seat to seat suspension (see Operator Seat Installation in this section).

Chassis

4. Make sure that seat electrical connectors are connected to machine wire harness (Fig. 21).

Groundsmaster 4000--D/4010--D

Page 7 -- 21

Chassis

Hood
49

41
1

43
39
38

4
37
36
5
6

29
25
28
42

11
3
7
10

33
27

9
25
30
35

15
46

45
17

18
19

RIGHT

FRONT
22

15
21

48
34

Figure 23
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Rear screen
Top screen
Screen assembly
Bulb seal
Bulb seal
Corner screen seal (2 used)
Hair pin (2 used)
Screw (8 used)
Screen pivot (2 used)
Hood pivot (2 used)
Hood
Carriage bolt (2 used)
Flange nut (2 used)
Door handle (2 used)
Flange head screw (4 used)
Oil filter deflector
Flange nut (4 used)

Chassis

18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

Latch
Latch cover
Hood latch bracket
Flexible draw latch (2 used)
LH latch bracket
Flange nut (6 used)
Plastic plug (24 used)
Cap screw (26 used)
Taptite screw (4 used)
Plastite screw (4 used)
Hood support
R--clamp (2 used)
Hood rod (2 used)
Clevis pin (2 used)
Hair pin (2 used)
Screw (2 used)

Page 7 -- 22

34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.

Washer head screw (2 used)
Cable tie
Flat washer (20 used)
Lock nut (20 used)
Pop rivet (22 used)
Flat washer (22 used)
RH screen mount
LH screen mount
RH latch bracket
Foam seal (2 used)
Latch bracket (2 used)
Latch keeper (2 used)
Tank support
Flange nut (4 used)
Flange head screw (4 used)
Hood shield

Groundsmaster 4000--D/4010--D

Removal
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
3

2. Remove hood using Figure 23 as a guide.
Installation

1. Install hood using Figure 23 as a guide.
2. Align hood to machine to allow correct operation of
hood latch and dust seals:
A. Place shim that is from 3/8” to 7/16“ (9.5 to 11.1
mm) thick on top of frame (both RH and LH sides)
near the sides of oil cooler (Figs. 24 and 25).
B. Close hood so that it rests on shims and fasten
the hood latches.

2
Figure 24
1. LH shim location
2. LH hood pivot

C. Loosen hood pivots at frame to adjust vertical
placement of pivots. Re--tighten hood pivot fasteners.

3. LH screen pivot

D. Loosen screen pivots to allow hood latches to pull
hood against radiator support. Re--tighten screen pivot fasteners.
3. After hood is assembled to machine, check for the
following:

A. Check that bulb and foam seals are equally compressed at all contact points with hood.
B. Hood should open and close without contacting
oil cooler hardware.

Figure 25
3. RH screen pivot

Chassis

1. RH shim location
2. RH hood pivot

Groundsmaster 4000--D/4010--D

Page 7 -- 23

Chassis

This page is intentionally blank.

Chassis

Page 7 -- 24

Groundsmaster 4000--D/4010--D

Chapter 8

Cutting Decks
Table of Contents

Cutting
Decks

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 3
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Castor Wheel Tire Pressure . . . . . . . . . . . . . . . . . . 3
Blade Stopping Time . . . . . . . . . . . . . . . . . . . . . . . . 3
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . 4
Factors That Can Affect Quality of Cut . . . . . . . . . 4
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . . 6
Front Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Side Cutting Deck . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Idler Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Blade Spindles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Blade Spindle Service . . . . . . . . . . . . . . . . . . . . . . 14
Castor Forks and Wheels . . . . . . . . . . . . . . . . . . . 16

Groundsmaster 4000--D/4010--D

Page 8 -- 1

Cutting Decks

Specifications

MOUNTING: Cutting decks are supported by lift arms
controlled with individual lift switches.
CONSTRUCTION: Deck chamber is welded 12 gauge
steel construction reinforced with channels and plates.
HEIGHT--OF--CUT RANGE: 1” to 5” (25.4 mm to 127
mm) in 1/2” (12.7 mm) increments. Front deck height-of--cut adjustment is achieved by changing spacers on
castor wheels and adjusting length of deck support
chains. Side deck adjustment requires adding or removing spacers from the castor forks, re--positioning the
castor wheel axles in the castor forks and securing the
pivot arms to the correct height--of--cut bracket holes.
DECK DRIVE: Closed loop hydraulic system operates
hydraulic motor on each cutting deck. The motor drives
one spindle directly with remaining deck spindle(s) driven by B section kevlar v--belt(s). Blade spindles are
1.250” (31.7 mm) shafts supported by greaseable, tapered roller bearings.

WIDTH OF CUT: Front deck provides 62” (1575 mm)
width of cut. Each side deck has 42” (1067 mm) width of
cut. Total width of cut is 132” (3353 mm) with 7” (128
mm) overlap.
DISCHARGE: Clippings are discharged from the rear of
the cutting decks. Provided mounting holes allow attachment of optional Guardian Recycler Kit.
SUSPENSION SYSTEM: A fully floating suspension
with hydraulic counterbalance. Front deck suspended at
rear from lift arms and has two (2) castor wheels, two (2)
adjustable skids and two (2) anti--scalp rollers. Each
side deck supported by three (3) castor wheels and a
spring damper system which connects the fourth deck
corner to the traction unit. There is a main lift arm that
provides counterbalance to the side decks along with a
rear anti--rotation link which also provides bi--directional
impact protection. Optional Guardian Recycler Kit includes one anti--scalp roller on each cutting deck.

CUTTING BLADE: Cutting blade dimensions are
21.750” (552 mm) long, 2.500” (64 mm) wide and 0.250”
(6.4 mm) thick. Anti--scalp cup installed on each cutting
blade. Three (3) blades on front deck and two (2) blades
on each side deck.
Cutting Decks

Page 8 -- 2

Groundsmaster 4000--D/4010--D

General Information
CAUTION
Never install or work on the cutting decks or lift
arms with the engine running. Always stop engine and remove key first.

Operator’s Manual
The Operator’s Manual provides information regarding
the operation, general maintenance and maintenance
intervals for your Groundsmaster machine. Refer to that
publication for additional information when servicing
and adjusting the cutting decks on your Groundsmaster.

Castor Wheel Tire Pressure
Castor tires on the front and side decks should be inflated to 50 PSI (345 kPa).

Blade Stopping Time
The blades of the cutting deck are to come to a complete
stop in approximately five (5) seconds after the cutting
deck engagement switch is shut down.
NOTE: Make sure the decks are lowered onto a clean
section of turf or hard surface to avoid dust and debris.

the blades on one of the cutting decks. Have the operator shut the cutting decks down and record the time it
takes for the blades to come to a complete stop. If this
time is greater than seven (7) seconds, the braking
valve on the hydraulic manifold may need adjustment.

Cutting
Decks

To verify this stopping time, have a second person stand
back from the deck at least twenty (20) feet and watch

Groundsmaster 4000--D/4010--D

Page 8 -- 3

Cutting Decks

Troubleshooting
There are a number of factors that can contribute to unsatisfactory quality of cut, some of which may be turf
conditions. Turf conditions such as excessive thatch,
uneven ground conditions, “sponginess” or attempting
to cut off too much grass height may not always be overcome by adjusting the machine.

Remember that the “effective” or actual height--of--cut
depends on cutting deck weight, tire pressures, hydraulic counterbalance settings and turf conditions. Effective
height--of--cut will be different than the bench set height-of--cut.

Factors That Can Affect Quality of Cut
Factor

Possible Problem/Correction

1. Maximum governed engine speed.

Check maximum governed engine speed. Adjust
speed to specifications if necessary.

2. Blade speed.

All deck blades should rotate at the same speed.
See items in Troubleshooting Section of Chapter 4 -Hydraulic System.

3. Tire pressure.

Check air pressure of each tire including castor tires.
Adjust to pressures specified in Operator’s Manual.

4. Blade condition.

Sharpen blades if their cutting edges are dull or nicked.
Inspect blade sail for wear or damage. Replace blade if
needed.

5. Mower housing condition.

Make sure that cutting chambers are in good condition.
Keep underside of deck clean. Debris buildup will
reduce cutting performance.

6. Height--of--cut.

Make sure all cutting decks are set at the same
height--of--cut. Set decks as specified in the Operator’s
Manual.

7. Cutting deck alignment and ground following.

Check lift arms and cutting deck pivot linkages for
wear, damage or binding. Also, inspect for bent or
damaged pivot shafts.

8. Roller and castor wheel condition.

All rollers and caster wheels should rotate freely.
Replace bearings if worn or damaged.

9. Grass conditions.

Mow when grass is dry for best cutting results. Also,
remove only 1” (25 mm) or 1/3 of the grass blade when
cutting.

Cutting Decks

Page 8 -- 4

Groundsmaster 4000--D/4010--D

Cutting
Decks

This page is intentionally blank.

Groundsmaster 4000--D/4010--D

Page 8 -- 5

Cutting Decks

Service and Repairs
CAUTION
Never install or work on the cutting decks or lift
arms with the engine running. Always stop engine and remove key from ignition switch first.

Front Cutting Deck

RIGHT
37

FRONT

60 to 70 ft--lb
(81 to 94 N--m)

36
30

90 to 100 ft--lb
(123 to 135 N--m)

150 to 175 ft--lb
(203 to 237 N--m)

39
28
29

18
1

20
21
22
23
2

38
19 40

14
11

24
8

7
6
5

10
9

4
3
28

Figure 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.

Cutting Decks

15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
27.

Cotter pin
Upper lift cylinder pin
Grease fitting
Lift cylinder
Lock nut
Pin
Cap screw
Flat washer (2 per pin)
Lift arm (LH shown)
Jam nut
Hair pin
Ball joint mount
Cotter pin

Page 8 -- 6

28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.

Groundsmaster 4000--D/4010--D

Removal (Fig. 1)
1. Position machine on a clean, level surface. Lower
cutting decks, stop engine, apply parking brake and remove key from the ignition switch.

NOTE: Removal of clevis pin from deck and height--of-cut chain is easier if deck is lifted slightly.
1

2. Remove hairpin and clevis pin that secure the
height--of--cut chain to the rear of the cutting deck (Fig.
2).
3. Remove hydraulic motor from cutting deck (see Cutting Deck Motor Removal in the Service and Repairs
Section of Chapter 4 -- Hydraulic System).

Figure 2
1. Hairpin and clevis pin

2. Height--of--cut chain

4. Remove cap screws, washers and lock nuts securing ball joint mounts to front deck castor arms (Fig. 4).
5. Slide the cutting deck away from the traction unit.
Installation (Fig. 1)
1. Position machine on a clean, level surface. Lower lift
arms, stop engine, apply parking brake and remove key
from the ignition switch.

1
1

2. Position the front deck to the lift arms.
3. Align ball joint mounts to front deck castor arms and
secure with cap screws, washers and lock nuts (Fig. 4).
NOTE: Installation of clevis pin to deck and height--of-cut chain is easier if deck is lifted slightly.

2
Figure 3
1. Flange head screw

4. Install clevis pin and hairpin that secure the height-of--cut chain to the rear of the cutting deck (Fig. 2).

2. Hydraulic motor

5. Install hydraulic motor to cutting deck (see Cutting
Deck Motor Installation in the Service and Repairs Section of Chapter 4 -- Hydraulic System).

6. Lubricate grease fittings on cutting deck and lift arm
assemblies.

Figure 4

Groundsmaster 4000--D/4010--D

Page 8 -- 7

3. Castor arm

Cutting
Decks

1. Ball joint mount
2. Lift arm

Cutting Decks

Side Cutting Deck
17

34
Thread locking
Compound

27
16
24
22

29
25

44
43
33

28 49

270 to 330 in--lb
(31 to 37 N--m)

15
14

13
5

FRONT

21 42
38
19
23
20

RIGHT

35 36

30
18

34
35

11
3

6
1

45
10
46
7

Figure 5
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.

Cutting Decks

18.
19.
20.
21.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.

Pivot shaft
Retaining ring
Thrust washer (2 per arm)
Flange bushing (2 per arm)
Rear arm (LH shown)
Lock nut (2 per damper)
Lock washer
Lock nut
Bumper pad (5 per arm)
Bumper mount
Cap screw
Bell crank (LH shown)
Damper
Damper rod end (2 per damper)
Cap screw (2 per damper)
Link tube

Page 8 -- 8

34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.

Lock nut (2 per spring)
Flat washer (4 per spring)
Bushing (2 per spring)
Damper spring
Lock nut (4 per arm)
Carriage screw (2 per arm)
Grease fitting
Jam nut
Lock nut (2 per arm)
Jam nut (2 per arm)
Rod end (2 per arm)
Plate
Cap screw (8 used per mount)
Lock washer (8 used per mount)
Flat washer (8 used per mount)
Spacer

Groundsmaster 4000--D/4010--D

Removal (Fig. 5)
1. Position machine on a clean, level surface. Lower
cutting decks, stop engine, apply parking brake and remove key from the ignition switch.

2. Remove hydraulic motor from cutting deck (see Cutting Deck Motor Removal in the Service and Repairs
Section of Chapter 4 -- Hydraulic System).
IMPORTANT: Do not change the length of the damper link (Fig. 8).

3. Remove hairpin and clevis pin that secure the damper link to the rear of the cutting deck (Fig. 8).
4. Remove eight (8) cap screws, lock washers and flat
washers that secure deck mount to cutting deck (Fig. 6).
5. Raise lift arm enough to separate deck mount from
cutting deck (Fig. 7).

2
Figure 6
1. Flange head screw
2. Hydraulic motor

3. Deck mount screw

6. Slide the cutting deck away from the traction unit.
Installation (Fig. 5)
1

1. Position machine on a clean, level surface. Stop
engine, apply parking brake and remove key from the
ignition switch.

2. Position the side cutting deck to the lift arm and deck
mount.

3. Lower lift arm while aligning deck mount to cutting
deck.
4. Install deck mount to cutting deck with (8) cap
screws, lock washers and flat washers (Fig. 6). Tighten
fasteners.

Figure 7
1. Lift arm (LH shown)
2. Damper link

3. Deck mount

IMPORTANT: The length of the damper link should
be from 5.295” to 5.445” (134 to 138 mm) measured
between rod end centers.
5. Install clevis pin and hairpin that secure the damper
link to the rear of the cutting deck (Fig. 8).
6. Install hydraulic motor to cutting deck (see Cutting
Deck Motor Installation in the Service and Repairs Section of Chapter 4 -- Hydraulic System).

1
5.295” to 5.445”
(134 to 138mm)

7. Lubricate grease fittings on cutting deck and lift arm
assembly.

Cutting
Decks

Figure 8
1. Damper link

Groundsmaster 4000--D/4010--D

Page 8 -- 9

2. Clevis pin

Cutting Decks

Idler Assembly

RIGHT
FRONT

20
19

13
8
11

24
6

7
5

2
19
3

Figure 9
1.
2.
3.
4.
5.
6.
7.
8.
9.

Cutting deck (front shown)
Flange nut
Flange nut
Adjusting screw
Idler pulley
Driven spindle (double pulley shown)
Flat washer
Lock washer
Socket head screw

10.
11.
12.
13.
14.
15.
16.
17.

Idler stop bolt
Flange nut
Cap screw
Spacer
Shoulder bolt
Idler spring
Lock nut
Idler arm

18.
19.
20.
21.
22.
23.
24.
25.

Retaining ring
Thrust washer
Bushing (2 used per idler)
Grease fitting
Washer
Flange head screw
Drive belt
Driven spindle (single pulley)

NOTE: The front deck is shown in Figure 9. The idler
assemblies used on the wing decks use the same idler
components.

Cutting Decks

Page 8 -- 10

Groundsmaster 4000--D/4010--D

Removal (Fig. 9)
1. Park machine on a level surface, lower cutting deck,
stop engine, engage parking brake and remove key
from the ignition switch.
2. Remove deck covers from top of cutting deck.

CAUTION
Be careful when removing idler spring. The
spring is under heavy load and may cause personal injury.
3. Use spring hook tool to unhook the idler spring (item
15) from the adjusting screw (item 4).
4. Remove drive belt(s) from deck pulleys.
5. Loosen flange nuts (item 11) that secure idler stop
bolt (item 10) to cutting deck to allow clearance between
idler arm and stop bolt.
6. Remove idler components as needed using Figure
9 as a guide. Note location of washers, idler spacer and
screw as idler assemblies are being removed.

CAUTION
Be careful when installing the idler spring. The
spring is under heavy load and may cause personal injury.
3. Use spring hook tool to attach the idler spring (item
15) onto the adjusting screw (item 4) and shoulder bolt
on idler arm.
4. With the idler arm tensioning the drive belt, the idler
spring hook to hook length should be from 3.250” to
3.750” (82.6 to 95.2 mm) (Fig. 10). If necessary, disconnect spring and change position of adjusting screw.
When idler spring is the correct length, tighten second
flange nut to secure idler adjustment.
5. Adjust location of idler stop bolt so that the clearance
between idler arm and idler stop bolt head is from 0.125”
to 0.185” (3.2 to 4.6 mm) (Fig. 10).
6. Lubricate idler arm grease fitting.
7. Install deck covers to cutting deck.

Installation (Fig. 9)

1. Install removed idler components using Figure 9 as
a guide.
A. Make sure that one (1) thrust washer (item 19) is
placed above and below the idler arm. Location of
additional washer (item 22) depends on whether the
idler pulley mounts on the bottom side of the idler arm
or on the top of the idler arm.
B. Secure idler arm assembly to cutting deck with
retaining ring.

Figure 10
1. Idler stop bolt
2. Idler spring

3. Adjusting screw

Cutting
Decks

2. Install drive belt to pulleys.

0.125” to 0.185”
(3.2 to 4.6 mm)

3.250” to 3.750”
(82.6 to 95.2 mm)

C. If idler stop bolt (item 10) was removed from deck,
make sure that it is installed in the hole that allows the
stop bolt head to align with the idler arm.

Groundsmaster 4000--D/4010--D

Page 8 -- 11

Cutting Decks

Blade Spindles
6

4
6

RIGHT
FRONT
6

Figure 11
1. Front cutting deck
2. RH cutting deck

Cutting Decks

3. LH cutting deck
4. Drive spindle

Page 8 -- 12

5. Driven spindle
6. Grease fitting location

Groundsmaster 4000--D/4010--D

Removal (Figs. 11 and 12)
1. Park machine on a level surface, lower cutting
decks, stop engine, apply parking brake and remove
key from the ignition switch.
2. Remove covers from cutting deck to allow access to
blade spindle.
3. If drive spindle is to be serviced, remove hydraulic
motor from cutting deck (see Cutting Deck Motor Removal in the Service and Repairs Section of Chapter 4
-- Hydraulic Systems). Position motor away from
spindle.
4. Loosen idler assembly to release drive belt tension
(see Idler Assembly Removal in this section). Remove
drive belt from spindle to be serviced.
5. Start the engine and raise the cutting deck. Stop engine and remove key from the ignition switch. Latch or
block up the cutting deck so it cannot fall accidentally.

4. Install drive belt to spindle pulleys and idler pulley.
Adjust drive belt tension (see Idler Assembly Installation
in this section).
5. If drive spindle was removed, install hydraulic motor
to cutting deck (see Cutting Deck Motor Installation in
the Service and Repairs Section of Chapter 4 -- Hydraulic Systems).
IMPORTANT: Pneumatic grease guns can produce
air pockets when filling large cavities and therefore,
are not recommended to be used for proper greasing of spindle housings.
6. Attach a hand pump grease gun to grease fitting on
spindle housing and fill housing cavity with grease until
grease starts to come out of lower seal.
7. Install covers to cutting deck.

6. Remove cutting blade, anti--scalp cup and blade bolt
from spindle to be serviced.

7. Remove spindle housing assembly from deck.
A. For driven spindle assemblies, remove eight (8)
flange head screws with flange nuts that secure
spindle to deck.

B. For drive spindle assemblies, remove four (4) cap
screws with washers that secure spindle and hydraulic motor mount to deck. Remove motor mount.
Then, remove four (4) flange head screws with flange nuts that secure spindle to deck.

C. Lift spindle assembly from deck.

Installation (Figs. 11 and 12)

88 to 108 ft--lb
(120 to 146 N--m)

1. Position spindle on cutting deck noting orientation of
grease fitting (Fig. 11). Secure spindle assembly to deck
with removed fasteners.
2. Install cutting blade, anti--scalp cup and blade bolt to
spindle. Tighten blade bolt from 88 to 108 ft--lb (120 to
146 N--m).

Figure 12
1.
2.
3.
4.
5.
6.

Deck (RH shown)
Driven spindle
Drive spindle
Flange head screw
Flange nut
Drive belt

7.
8.
9.
10.
11.

Washer
Cap screw
Blade
Anti--scalp cup
Blade bolt

Cutting
Decks

3. Slowly rotate cutting blades to verify that blades do
not contact any deck components.

Groundsmaster 4000--D/4010--D

Page 8 -- 13

Cutting Decks

Blade Spindle Service
2

130 to 150 ft--lb
(176 to 203 N--m)

130 to 150 ft--lb
(176 to 203 N--m)
7

2
6

11
12
9
8

DRIVE SPINDLE

Figure 13
1.
2.
3.
4.
5.

Lock nut
Hardened washer
Driven pulley (single shown)
Spindle shaft
Drive pulley

6.
7.
8.
9.

Hydraulic motor mount
O--ring
Oil seal
Bearing cup and cone

10.
11.
12.
13.

Spacer set
Spindle housing
Grease fitting
Spindle shaft spacer

Disassembly (Fig. 13)

Assembly (Fig. 13)

1. Loosen and remove lock nut from top of spindle
shaft. Remove hardened washer and pulley from
spindle. For drive spindle, remove hydraulic motor
mount.

NOTE: A replacement spindle bearing set contains two
(2) bearings, a spacer ring and a large snap ring (items
1, 2 and 3 in Fig. 14). These parts cannot be purchased
separately. Also, do not mix bearing set components
from one deck spindle to another.

2. Remove the spindle shaft from the spindle housing
which may require the use of an arbor press. The spindle
shaft spacer should remain on the spindle shaft as the
shaft is being removed.
3. Carefully remove oil seals from spindle housing taking care to not damage seal bore in housing.
4. Allow the bearing cones, inner bearing spacer and
spacer ring to drop out of the spindle housing (Fig. 14).
5. Using an arbor press, remove both of the bearing
cups and the outer bearing spacer from the housing.
6. The large snap ring can remain inside the spindle
housing. Removal of this snap ring is very difficult.

Cutting Decks

NOTE: A replacement bearing spacer set includes the
inner spacer and outer spacer (items 4 and 5 in Fig. 14).
Do not mix bearing spacers from one deck spindle to
another.
IMPORTANT: If new bearings are installed into a
used spindle housing, it may not be necessary to replace the original large snap ring. If the original
snap ring is in good condition with no evidence of
damage (e.g. spun bearing), leave the snap ring in
the housing and discard the snap ring that comes
with the new bearings. If the large snap ring is found
to be damaged, replace the snap ring.
1. If large snap ring was removed from spindle housing,
install snap ring into housing groove. Make sure snap
ring is fully seated in housing groove.

Page 8 -- 14

Groundsmaster 4000--D/4010--D

2. Install outer bearing spacer into top of spindle housing. The spacer should fit against the snap ring.

3. Using an arbor press, push the bearing cups into the
top and bottom of the spindle housing. The top bearing
cup must contact the outer bearing spacer previously
installed, and the bottom bearing cup must contact the
snap ring. Make sure that the assembly is correct by
supporting the first bearing cup and pressing the second
cup against it (Fig 15).

1
Figure 14
1. Bearing
2. Spacer ring
3. Large snap ring

6. Slide spacer ring and inner bearing spacer into
spindle housing, then install upper bearing cone and oil
seal into top of housing. Note: The upper seal must have
the lip facing in (down) (Fig. 16). Also, upper seal should
be flush or up to 0.060” (1.5 mm) recessed into housing.

8. Install spindle shaft spacer onto shaft. Place thin
sleeve or tape on spindle shaft splines to prevent seal
damage during shaft installation.

4. Inner bearing spacer
5. Outer bearing spacer

PRESS

IMPORTANT: If bearings are being replaced, make
sure to use the spacer ring that is included with new
bearing set (Fig. 14).

7. Inspect the spindle shaft and shaft spacer to make
sure there are no burrs or nicks that could possibly damage the oil seals. Lubricate the shaft and spacer with
grease.

4. Pack the bearing cones with grease. Apply a film of
grease on lips of oil seals and O--ring.
5. Install lower bearing cone and oil seal into bottom of
spindle housing. Note: The bottom seal must have the
lip facing out (down) (Fig. 16). This seal installation allows grease to purge from the spindle during the lubrication process.

Figure 15
1. Bearing cups
2. Large snap ring
3. Outer bearing spacer

4. Arbor press
5. Support
6. Arbor press base

9. Carefully slide spindle shaft with spacer up through
spindle housing. The bottom oil seal and spindle spacer
fit together when the spindle is fully installed.
10.Install O--ring to top of spindle shaft. For drive
spindle, position hydraulic motor mount to top of spindle.
11. Install pulley (hub down), hardened washer and lock
nut to spindle shaft. Tighten lock nut from 130 to 150 ft-lb (176 to 203 N--m).

12.Attach a hand pump grease gun to grease fitting on
housing and fill housing cavity with grease.
13.Rotate spindle shaft to make sure that it turns freely.

Groundsmaster 4000--D/4010--D

Figure 16
1. Bottom seal installation

Page 8 -- 15

2. Upper seal installation

Cutting Decks

Cutting
Decks

IMPORTANT: Pneumatic grease guns can produce
air pockets when filling large cavities and therefore,
are not recommended to be used for proper greasing of spindle housings.

Castor Forks and Wheels

FRONT CUTTING DECK

SIDE CUTTING DECK
34

14
13
12

6
7

19
10
9
8

31
5

15
2

32
17

21
22

60 to 80 ft--lb
(81 to 108 N--m)

CASTOR WHEEL

28
23

60 to 80 ft--lb
(81 to 108 N--m)

29 30
23

25
26
27

Figure 17
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Castor arm (front deck)
Cap screw (5 used)
Castor fork
Cap screw
Lock nut
Castor spacer
Thrust washer
Flange nut (5 used)
Grease fitting
Flange bushing
Retaining ring
Cap washer

13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.

Compression spring
Cap
Flat washer
Lock nut (3 used per bracket)
Carriage screw (3 used per bracket)
Castor fork bracket
Shim
Castor bracket
Hairpin
Cutting deck (RH shown)
Bearing

24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.

Inner bearing spacer
Wheel hub
Wheel rim half
Castor tire
Wheel rim half
Plate
Flange nut
Flat washer
Tension rod
Flange nut
Clevis pin

Disassembly

Assembly

1. Disassemble castor wheel as needed using Figure
17 as a guide.

1. Assemble castor wheel using Figure 17 as a guide.
2. If castor fork was removed, lubricate grease fitting.
3. Torque castor wheel lock nut (item 5) from 60 to 80
ft--lb (81 to 108 N--m).

Cutting Decks

Page 8 -- 16

Groundsmaster 4000--D/4010--D

Chapter 9

Operator
Cab

Operator Cab
Table of Contents
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . 2
Operator’s Manual . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Electrical Components and Schematic . . . . . . . . . 2
Air Conditioning System . . . . . . . . . . . . . . . . . . . . . . 2
Cab Heater System . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SERVICE AND REPAIRS . . . . . . . . . . . . . . . . . . . . . . 3
General Precautions for Removing and Installing
Air Conditioning System Components . . . . . . . . 3
Air Conditioning Compressor . . . . . . . . . . . . . . . . . 4
Roof Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Air Conditioning Condenser Assembly . . . . . . . . . 8
Heater/Evaporator Assembly . . . . . . . . . . . . . . . . 10
SANDEN SD COMPRESSOR SERVICE GUIDE

Groundsmaster 4010--D

Page 9 -- 1

Operator Cab

General Information
The information in this chapter pertains to the operator
cab on the Groundsmaster 4010--D.

Operator’s Manual
The Operator’s Manual provides information regarding
the operation, general maintenance and maintenance
intervals for your Groundsmaster. Refer to the Operator’s Manual for additional information when servicing
the machine.

Electrical Components and Schematic
Information regarding Groundsmaster 4010--D electrical cab components (switches and relay) is included in
Chapter 5 -- Electrical System. The electrical schematic
and harness drawings for the operator cab are included
in Chapter 10 -- Foldout Drawings.

Air Conditioning System
The air conditioning system used on the Groundsmaster
4010--D consists of the following components:

4. The necessary hoses and tubes that connect the
system components.

1. A compressor mounted on the engine and driven by
a v--belt.

5. A fan motor that provides air movement through the
evaporator and into the cab. The fan motor is located in
the cab headliner and is also used for the cab heater
system.

2. A condenser and condenser fan located on the top
of the cab.
3. A drier--receiver, an expansion valve and an evaporator (combined with the heater core) mounted in the
headliner of the cab.

6. Operator controls to turn the air conditioning on, to
adjust the fan speed and to control the cab air temperature.

Cab Heater System
The cab heater system used on the Groundsmaster
4010--D consists of the following components:
1. A heater core (combined with the A/C evaporator) located in the cab headliner.
2. Hoses to allow a circuit for engine coolant to circulate
through the heater core. The heater core (combined
with the A/C evaporator) is located in the headliner of the
cab.

Operator Cab

3. A fan motor that provides air movement through the
heater core and into the cab. The fan motor is located in
the cab headliner and is also used for the air conditioning system.
4. Operator controls to adjust the fan speed and to control the cab air temperature.

Page 9 -- 2

Groundsmaster 4010--D

Service and Repairs

5. Put labels on disconnected lines and hoses for proper installation after repairs are completed.

CAUTION
The air conditioning system is under high pressure. Do not loosen any system fitting or component until after the system has been completely
discharged by a certified A/C service technician.

WARNING
Always wear safety goggles or a face shield
when working with air conditioning system components. Also, do not allow refrigerant contact
with your skin or eyes as there would be the possibility of serious injury.

CAUTION
Never use compressed air to leak test or pressure test the air conditioning system. Under certain conditions, pressurized mixtures of refrigerant and air can be combustible.
1. Before servicing any air conditioning system components, park machine on a level surface, apply parking
brake, lower cutting decks or attachments and stop engine. Remove key from the ignition switch.
2. Clean machine before disconnecting, removing or
disassembling any air conditioning system components. Thorough cleaning will prevent system contamination while performing service procedures.
3. Put caps or plugs on any lines, fittings or components
left open or exposed to prevent system contamination.
4. Before loosening or removing any air conditioning
system hose or other component, have a certified air
conditioning service technician recover the system refrigerant and then evacuate the air conditioning system
completely. It is illegal to vent refrigerant to the atmosphere.

Groundsmaster 4010--D

6. If compressor is removed from machine, keep compressor in the same orientation as the installed position.
This will prevent compressor oil from filling the compressor cylinders.
7. Note the position of fittings (especially elbow fittings)
before removal. Mark parts if necessary to make sure
they will be aligned properly when reinstalling hoses and
tubes.
8. Always use a DOT approved tank for storing used
and recycled refrigerants.
9. The Groundsmaster 4010--D air conditioning system
uses R134a refrigerant. DO NOT use other refrigerants
in the system. A/C system capacity is 1.25 pounds of
R134a refrigerant.
10.Refrigerant containers (either full or empty) are under pressure that will increase if the containers are
heated. DO NOT expose refrigerant containers to high
heat sources or flame.
11. Be sure the work area is properly ventilated to prevent any accumulation of refrigerant or other fumes.
12.Make sure that caps are always placed on the pressure hose ports. These caps prevent refrigerant leakage
from the system.
13.The drier--receiver component is used to collect
moisture that will reduce air conditioning performance.
If the air conditioning system is opened for component
repair or replacement, drier--receiver replacement is
recommended.
14.After installing air conditioning components, have a
certified air conditioning service technician evacuate the
air conditioning system completely, properly recharge
the system with R134a refrigerant and then leak test the
system.

Page 9 -- 3

Operator Cab

Operator
Cab

General Precautions for Removing and Installing Air Conditioning System Components

Air Conditioning Compressor

FRONT
RIGHT

31
29

23
22

22 23

28
2

8
5
2

16
17

13 10

Figure 1
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.

Cap screw (3 used)
Lock washer (8 used)
Pulley
V--belt
Lower radiator hose
Hose clamp (2 used)
Lower radiator hose
Cap screw (3 used)
Alternator plate
Carriage screw
Flat washer
Idler pulley

13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.

Idler plate bracket
Lock nut
Cap screw (3 used)
A/C compressor mount
Flat washer (5 used)
Cap screw (2 used)
Cap screw (2 used)
Spacer
Compressor arm
Lock washer (5 used)
Hex nut (5 used)
Cap screw

Removal (Fig. 1)
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Raise hood to allow access to engine.
Operator Cab

25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.

Hex nut (2 used)
Cap screw
Flat washer
Spacer (2 used)
Alternator (90 amp)
Air conditioning compressor
Alternator wire harness
Radiator fitting
90o fitting
90o fitting
Bolt

3. Loosen lock nut that secures idler pulley. Move
pulley to loosen A/C compressor drive belt. Remove
drive belt from A/C compressor pulley.
4. Inspect compressor drive belt for glazing or damage.
Replace belt if necessary.

Page 9 -- 4

Groundsmaster 4010--D

6. Read the General Precautions for Removing and
Installing Air Conditioning System Components at the
beginning of the Service and Repairs section of this
chapter.

CAUTION
The air conditioning system is under high pressure. Do not loosen any system fitting or component until after the system has been completely
discharged by a certified A/C service technician.
7. Have refrigerant evacuated from air conditioning
system by a certified A/C service technician.
8. Label and remove hoses from compressor. Immediately cap hoses and fittings to prevent moisture and contaminants from entering the system.
9. Support compressor to prevent it from shifting or falling.
NOTE: There may be shims mounted between compressor and compressor arm. When removing compressor, note shim location and quantity for assembly
purposes.
10.Remove fasteners and spacers that secure compressor to compressor mount and compressor arm.
IMPORTANT: To prevent compressor oil from filling
the compressor cylinders, keep compressor in the
same orientation as the installed position.

2. The clearance between the compressor mounting
flanges and pivot plate must be less than 0.004” (0.10
mm). If necessary, install shims between compressor
flanges and pivot plate to adjust clearance. See Parts
Catalog for shim kit.
3. Secure compressor to compressor mount and compressor arm with removed fasteners and spacers. Do
not fully tighten fasteners.
IMPORTANT: After the compressor has been
installed, make sure to rotate the compressor drive
shaft several times to properly distribute oil in the
compressor. Compressor damage due to oil slugging can occur if this procedure is not performed.
4. Manually rotate the compressor drive shaft at least
ten (10) revolutions to make sure that no compressor oil
is in the compressor cylinders.
5. Place drive belt onto compressor pulley.
6. Tension compressor drive belt with idler pulley. Make
sure to tighten lock nut to secure belt adjustment.
7. Remove caps that were placed on hoses and fittings
during the removal process. Using labels placed during
removal, properly secure hoses to compressor.
8. Connect compressor electrical connector to machine wire harness.
9. Have a certified air conditioning service technician
evacuate the air conditioning system completely, properly recharge the system with R134a refrigerant and
then leak test the system. A/C system capacity is 1.25
pounds of R134a refrigerant.
10.Lower and secure hood.

11. Carefully remove compressor from engine and machine.

NOTE: The replacement of the drier--receiver is recommended whenever A/C compressor is removed from the
system (see Heater and Evaporator Assembly in this
section).

NOTE: The air conditioning compressor used on the
Groundsmaster 4010--D is a Sanden model SD5H09.
For air conditioning compressor repair procedures, see
the SD Compressor Service Guide at the end of this
chapter.
3

Installation (Fig. 1)
1. Position compressor to compressor mount and compressor arm.

Groundsmaster 4010--D

Figure 2
1. A/C compressor
2. Alternator

Page 9 -- 5

3. Compressor arm

Operator Cab

Operator
Cab

5. Disconnect compressor electrical connector from
machine wire harness.

Roof Assembly
FRONT

3
15

2
3
4

6
12

4
8

9
11

Figure 3
1.
2.
3.
4.
5.
6.

Roof
Screw (2 used)
Flat washer (6 used)
Bushing (10 used)
Rear fastener (2 used)
Rear spacer (2 used)

Operator Cab

7.
8.
9.
10.
11.

Panel nut
Roof mount
Flange nut (2 used)
Flange nut (4 used)
Headliner

Page 9 -- 6

12.
13.
14.
15.
16.

Front spacer (2 used)
Front fastener (2 used)
Rubber washer
Cap screw
Hex nut (4 used)

Groundsmaster 4010--D

To gain access to the heater core and air conditioning
components that are located under the cab roof, the roof
panel can be loosened, raised and supported.

2
1

Removal (Fig. 3)

2. Remove screw (item 2), flat washer (item 3) and
bushing (item 4) that secure the rear of the roof to the
roof mount.
3. Remove the cap screw (item 15) and rubber washer
(item 14) that secure the front of the roof.
4. Remove four (4) hex nuts (item 16), flat washers
(item 3) and bushings (item 4) that secure roof to front
and rear fasteners.
5. Carefully lift front of roof while leaving rear of roof
against headliner. Support front of roof in the raised
position to allow access to heater and air conditioning
components.
Installation (Fig. 3)

Figure 4
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Heater/evaporator assembly
Heater valve
A/C hose: evaporator to compressor
Air duct hose
A/C hose: compressor to condenser
A/C hose: condenser to drier
Heater hose: thermostat to heater valve
Heater hose: heater core to water pump
Heater hose: heater valve to heater core
Condensation drain hose (2 used)
A/C hose: drier to evaporator

1. Make sure that all components in headliner and roof
are installed and secure.
2. Remove support and carefully lower roof into position.
3. Secure roof to headliner with all removed fasteners.

Groundsmaster 4010--D

Page 9 -- 7

Operator Cab

Operator
Cab

1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.

Air Conditioning Condenser Assembly
1
2

10
3

6
4

6
9

Figure 5
1.
2.
3.
4.

Condenser cover
Lock nut (4 used)
Condenser fan
Condenser coil assembly

5. Carriage screw (2 used)
6. Flat washer (8 used)
7. Roof

Removal (Fig. 5)
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.

6. Read the General Precautions for Removing and
Installing Air Conditioning System Components at the
beginning of the Service and Repairs section of this
chapter.

2. Remove fasteners that secure roof in place. Raise
and support roof to allow access to condenser assembly
(see Roof Assembly Removal in this section).
3. Disconnect wire harness connector from condenser
fan motor.
4. Remove button head screws (item 10) that secure
condenser fan and cover to condenser coil.
5. Remove fasteners (items 2, 6 and 8) that secure
front of condenser cover to roof. Lift condenser fan and
cover from roof.

Operator Cab

8. Bushing (4 used)
9. Mounting strap
10. Button head screw (4 used)

Page 9 -- 8

Groundsmaster 4010--D

8. Label and remove hoses from condenser coil. Immediately cap hoses and fittings to prevent moisture and
contaminants from entering the system.

9. Remove condenser coil from roof using Figure 6 as
a guide.

Installation (Fig. 5)

11
3
4
10
9

1. Install condenser coil to roof using Figure 6 as a
guide.

4. Secure condenser fan to condenser coil with button
head screws (item 10).
5. Connect wire harness connector to condenser fan
motor.

5
6

2. Remove caps that were placed on hoses and fittings
during the removal process. Using labels placed during
removal, properly secure hoses to condenser coil.
3. Position condenser cover and condenser fan to roof.
Secure cover and fan with removed fasteners (items 2,
6 and 8).

Operator
Cab

NOTE: The replacement of the drier--receiver is recommended whenever the air conditioning system is
opened (see Heater/Evaporator Assembly in this section).

Figure 6
1.
2.
3.
4.
5.
6.
7.
8.

Condenser fan mount
Screw (4 used)
Condenser coil
Coupler nut (4 used)
Isolator mount (4 used)
Bushing (6 used)
Flat washer (4 used)
Screw (4 used)

9.
10.
11.
12.
13.
14.
15.
16.

Compression foam
Side foam (2 used)
Screw (4 used)
Condenser fan
Panel nut (4 used)
Screen frame
End foam (2 used)
Screen

6. Make sure that all machine air conditioning components are installed and secure.
7. Have a certified air conditioning service technician
evacuate the air conditioning system completely, properly recharge the system with R134a refrigerant and
then leak test the system. A/C system capacity is 1.25
pounds of R134a refrigerant.
8. Lower and secure roof assembly (see Roof Assembly Installation in this section).

Groundsmaster 4010--D

Page 9 -- 9

Operator Cab

Heater/Evaporator Assembly
10

4
3

5
8

8
11
11

Figure 7
1.
2.
3.
4.

Heater/evaporator assembly
Top cover
Flange head screw (2 used)
Drier--receiver mount

5.
6.
7.
8.

Bottom cover
Hose clamp (2 used)
Speed nut (8 used)
Panel nut (4 used)

Removal (Fig. 7)
1. Park machine on a level surface, lower cutting
decks, stop engine, engage parking brake and remove
key from the ignition switch.
2. Remove fasteners that secure roof in place. Raise
and support roof to allow access to heater/evaporator
assembly (see Roof Assembly Removal in this section).

Operator Cab

9. Drier--receiver assembly
10. Screw (8 used)
11. Screw (5 used)

3. Disconnect wire harness connectors from fan motor
and binary switch on drier--receiver.
4. Read the General Precautions for Removing and
Installing Air Conditioning System Components at the
beginning of the Service and Repairs section of this
chapter.

Page 9 -- 10

Groundsmaster 4010--D

The air conditioning system is under high pressure. Do not loosen any system fitting or component until after the system has been completely
discharged by a certified A/C service technician.
5. Have refrigerant evacuated from air conditioning
system by a certified A/C service technician.

9. Operate the heater system to make sure that no engine coolant leaks exist.
10.Lower and secure roof assembly (see Roof Assembly Installation in this section).

6. Label and remove hoses from heater core, evaporator and drier--receiver. Immediately cap hoses and fittings to prevent moisture and contaminants from
entering the system.

7. Loosen hose clamp that secures air duct hose to
heater/evaporator assembly covers. Slide hose from
covers.
8. Remove screws that secure top cover to bottom cover. Remove top cover to access heater/evaporator assembly.

9. Disassemble heater/evaporator assembly using Fig.
9 as a guide.
NOTE: The replacement of the drier--receiver is recommended whenever the air conditioning system is
opened.

Figure 8
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.

Installation (Fig. 7)
1. Assemble heater/evaporator assembly using Fig. 9
as a guide. Make sure that expansion valve is covered
with insulating tape to prevent condensation issues.
2. Position heater/evaporator assembly into bottom
cover in headliner. Secure top cover to bottom cover
with removed screws.
3. Slide air duct hose onto heater/evaporator assembly
covers and secure with hose clamp.

8
2

1
2

4. Remove caps that were placed on hoses and fittings
during the removal process. Using labels placed during
removal, properly secure hoses to heater core, evaporator and drier--receiver.

Groundsmaster 4010--D

6. Connect wire harness connectors to fan motor and
binary switch on drier--receiver.
7. Make sure that all machine air conditioning components are installed and secure.

5. Make sure that condensation hoses are secured to
bottom housing of heater/evaporator assembly and are
routed to cab frame for proper draining of condensate.

Figure 9
1.
2.
3.
4.
5.

Page 9 -- 11

Fan motor
Blower wheel
Heater/evaporator core
Expansion valve
Freeze switch

6.
7.
8.
9.

Resistor guard
Bottom housing
Top housing
Resistor

Operator Cab

Operator
Cab

CAUTION

8. Have a certified air conditioning service technician
evacuate the air conditioning system completely, properly recharge the system with R134a refrigerant and
then leak test the system. A/C system capacity is 1.25
pounds of R134a refrigerant.

This page is intentionally blank.

Operator Cab

Page 9 -- 12

Groundsmaster 4010--D

Chapter 10

Foldout Drawings
Table of Contents

Groundsmaster 4000--D/4010--D

Page 10 -- 1

Foldout
Drawings

HYDRAULIC SCHEMATIC . . . . . . . . . . . . . . . . . . . . . 3
ELECTRICAL SCHEMATICS
Sheet 1 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Sheet 2 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Sheet 3 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operator Cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WIRE HARNESS DRAWINGS
Platform Wire Harness . . . . . . . . . . . . . . . . . . . . . . . 9
Rear Wire Harness . . . . . . . . . . . . . . . . . . . . . . . . . 12
Cab Wire Harness . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Cab Interconnect Wire Harness . . . . . . . . . . . . . . 16

Foldout Drawings

This page is intentionally blank.

Foldout Drawings

Page 10 -- 2

Groundsmaster 4000--D/4010--D

.070

.063

.035

.063

FRONT PTO
MANIFOLD
S1

RV1

RV2

LIFT/LOWER
MANIFOLD

TRACTION
MANIFOLD

LH PTO
MANIFOLD

BYPASS
VALVE

4WD
MANIFOLD

FAN DRIVE
MANIFOLD

FILTER
MANIFOLD
RH PTO
MANIFOLD

Groundsmaster 4000--D/4010--D
Hydraulic Schematic
Page 10 -- 3
Rev. A

STANDARD ON GM4010--D
(OPTIONAL ON GM4000--D)

Groundsmaster 4000--D/4010--D
Electrical Schematic
Sheet 1 of 3
All relays and solenoids
are shown as de-- energized.
All ground wires are black.
NOTE: THE ELECTRICAL SCHEMATIC IS SHOWN ON THREE (3) SHEETS.
WHEN A CONDUCTOR CONTINUES ON ANOTHER SHEET, THE SHEET
NUMBER WILL BE IDENTIFIED.

Page 10 -- 4

(BRAKE APPLIED)
(NOT IN NEUTRAL)
(SEAT UNOCCUPIED)

ENGINE OIL PRESSURE

(OPTIONAL KIT)
ALTERNATOR

(OPTIONAL KIT)

Groundsmaster 4000--D/4010--D
Electrical Schematic
Sheet 2 of 3
All relays and solenoids
are shown as de-- energized.
All ground wires are black.
NOTE: THE ELECTRICAL SCHEMATIC IS SHOWN ON THREE (3) SHEETS.
WHEN A CONDUCTOR CONTINUES ON ANOTHER SHEET, THE SHEET
NUMBER WILL BE IDENTIFIED.

Page 10 -- 5

Groundsmaster 4000--D/4010--D
Electrical Schematic
Sheet 3 of 3
All relays and solenoids
are shown as de-- energized.
All ground wires are black.
NOTE: THE ELECTRICAL SCHEMATIC IS SHOWN ON THREE (3) SHEETS.
WHEN A CONDUCTOR CONTINUES ON ANOTHER SHEET, THE SHEET
NUMBER WILL BE IDENTIFIED.

Page 10 -- 6

1F 3 30 A A/C
BU
BN

VIO

1F 2 15 A HEATER

L
2
B
3

--2

--7

--8

--5

--6

RESISTOR
2

--3

BK/W

--4

BK/W

FREEZE SWITCH

PWR

GND

5
4

H
C

OR
Y

1
3

4
6

BU
OR

30
85

87a
87
86

BK/W
OR/BK
BK

BINARY SWITCH
AIR CONDITIONING
(PRESSURE SWITCH)

P05--H

56--E

56--D

LINE 38
LINE 39

1F 1 15 A WORK LIGHTS

P05--G

BK
W/BK

2
3

GN
R

GN
R
W/BK
BK

P11--1
P11--2
P11--3
P11--4
P11--5

VIO

PWR

WINDSHIELD WASHER/WIPER

LOW SPEED
HIGH SPEED
PARK
INTERMITTENT
GROUND

GN
R
BK
BU
BN

W/BK
R/W

1F 4

2F 3

WINDSHIELD WIPER

BEACON

PWR

VIO

R
DOME LIGHT SWITCH

VIO

3
5

WINDSHIELD WASHER
PUMP

GND

R/W

AIR CONDITIONER CLUTCH

GND

SHEET
1 OF 3

CONDENSER FAN

RELAY

W/BK

1
3
BLOWER FAN

OR/BK

M
1

AIR CONDITIONING
ON/OFF SWITCH

2F 2 15 A DOME LIGHT

--1

OR/BK

FAN SWITCH

2F 1 15 A FRONT WIPER

BN
VIO

DOME LIGHT

WORK LIGHT

VIO

6
WORK LIGHTS
SWITCH

LEFT HAND

VIO

TURN SIGNAL

FRONT

2F 4

VIO

WORK LIGHT

BK
BU

RIGHT HAND

VIO

VIO
GROUND
BLOCK

TURN SIGNAL

WORK LIGHT

BK
BRAKE/TURN 05--A

GROUND
BK
TAIL
VIO
WARNING/TURN
BN

BK
WARNING/TURN 05--C

LEFT HAND

BRAKE/TURN
TURN SIGNAL

REAR

FLASHER
MODULE

VIO

WORK LIGHT

BK
BRAKE/TURN 05--B
TAIL 05--E
WARNING/TURN 05--D

VIO
BU

RIGHT HAND

BRAKE/TURN
GROUND
TAIL
WARNING/TURN

TURN SIGNAL

Groundsmaster 4010--D
Electrical Schematic
Operator Cab
All relays and solenoids
are shown as de-- energized.
All ground wires are black.

Page 10 -- 7

This page is intentionally blank.

Page 10 -- 8

TO REAR
HARNESS

(OPTIONAL KIT)
(OPTIONAL KIT)

A/C CLUTCH &
WS WASHER
PUMP

(OPTIONAL KIT)

(OPTIONAL KIT)
NOTE CLOCK POSITION

NOTE CLOCK POSITION

TO REAR
HARNESS
TEC--5001
COMM PORT

(NOT USED)

TO REAR
HARNESS

Groundsmaster 4000--D/4010--D
Platform Wire Harness Drawing
Page 10 -- 9

Page 10 -- 10
(OPTIONAL KIT)

Groundsmaster 4000--D/4010--D
Platform Wire Harness Diagram
Sheet 1 of 2

NOTE: THE PLATFORM WIRE HARNESS DIAGRAM IS SHOWN ON TWO (2)
SHEETS. WHEN A CONDUCTOR CONTINUES ON ANOTHER SHEET, A
REFERENCE NUMBER WILL BE IDENTIFIED.
(OPTIONAL KIT)
(OPTIONAL KIT)
(OPTIONAL KIT)

659

BLACK
BLACK

PINK
GRAY/BLACK
BLACK

258

636

BLACK

RED/YELLOW
WHITE/BLACK
PINK/BLACK

BLUE
BROWN/YELLOW
BLACK

BLACK
BLACK
WHITE/BLACK

154

BROWN/WHITE

165

BLACK/WHITE
RED/WHITE

635

728

167

WHITE/GREEN

246

WHITE/BLACK
TAN/WHITE
WHITE/BLUE
GRAY/BLUE

245

BLACK
TAN/BLACK
GREEN/YELLOW
YELLOW
VIOLET/BLACK
BLUE
RED/YELLOW
GRAY/GREEN

747

289

BLACK
271

BLACK
BLUE/BLACK
WHITE
PINK/BLACK
BLACK

168

169

269

198

PINK

208

174

VIOLET
BLACK
RED/GREEN
WHITE/BLACK
754

WHITE/YELLOW

BLACK

WHITE
GRAY
GREEN
RED/BLACK

VIOLET/BLACK
YELLOW/BLACK
WHITE/BLUE

VIOLET
BLACK

YELLOW/BLUE
BROWN
PINK

172
270

175

197

206

156

166

RED/WHITE
272

GRAY/BLACK
YELLOW/BLUE
BLUE/WHITE
BROWN/YELLOW
GREEN/WHITE
YELLOW/GREEN
BROWN
RED/BLUE
BROWN/BLACK
RED/BLACK
ORANGE
GRAY
GREEN
WHITE/BLACK
GRAY/BROWN
YELLOW/BLACK
GREEN/BLACK
ORANGE/BLACK
BLACK

RED/WHITE
BLACK/WHITE
171

PINK

BLACK
BLACK

BLACK

GRAY

RED/GREEN
BLACK
641

BLACK

RED/WHITE
BLACK/WHITE
RED/WHITE
BLACK/WHITE

VIOLET

BROWN/YELLOW

WHITE/YELLOW
BLACK

GRAY/BROWN

BLACK
BROWN

GRAY
BLACK

TO REAR HARNESS
TO REAR HARNESS

PINK
WHITE

PINK

BLACK/WHITE

BLACK
BLACK
BLACK

BLACK

BROWN

PINK/BLACK

PINK/BLACK
265

242

163
155

GREEN

TO REAR
HARNESS

TO REAR HARNESS

BLACK

BLUE
PINK/BLACK

WHITE/ORANGE

PINK
PINK

BLACK
WHITE

YELLOW

BLUE

BROWN

ORANGE
GRAY
YELLOW
RED
GREEN
BLACK
YELLOW

BLACK

WHITE
PINK
PINK

WHITE

PINK
GREEN

BLUE/WHITE
BLACK
BROWN

265

728

175

VIOLET

YELLOW
PINK

PINK

BLACK

GRAY/BLUE

BLACK

GRAY

PINK

(NOT
USED)

197
747

641
166

BLACK

635

165

167

636

PINK/GREEN
270
172

YELLOW/BLUE

PINK

154

269

GREEN/BLACK
ORANGE/BLACK
BLACK

WHITE/BLUE

BLACK
ORANGE/WHITE
WHITE/BLUE
PINK/BLACK
BLACK

242

246

BLACK

BLACK
TAN/BLACK
VIOLET/WHITE
PINK/WHITE
GRAY/BLACK
PINK/GREEN

BLACK

155

659
171

BLACK

TAN/WHITE
BLACK

GRAY/BLACK
VIOLET/BLACK
YELLOW/BLACK
WHITE/YELLOW
VIOLET
PINK
TAN
RED/GREEN
BROWN/BLACK
VIOLET
BROWN/YELLOW
TAN/WHITE
BLUE/BLACK
YELLOW/BLUE

BLACK

VIOLET/BLACK
BLACK

198

VIOLET

258

168

WHITE/BLACK
ORANGE
GREEN/PINK
PINK/BLACK
BLUE

206

BLACK/WHITE
RED/WHITE

BLACK/WHITE
RED/WHITE
245

PINK

(IF EQUIPPED)

BROWN
BLUE

BLUE

BLACK

BLUE/BLACK

BLACK

271
BLACK
PINK
WHITE/BLUE
YELLOW/BLUE
BLUE/BLACK

BLUE
BROWN

VIOLET

BROWN
BLUE

PINK

YELLOW/BLACK
BLACK

BLUE/BLACK
BLACK

BLACK
VIOLET/WHITE

PINK/WHITE

PINK
YELLOW

VIOLET

BLACK
YELLOW

GRAY
BLACK

BLACK

174

163

156

754

169

289

272

WHITE

BLACK
RED/GREEN

BLACK
WHITE/YELLOW

BLACK

208

GRAY

RED/WHITE
BLACK/WHITE

A/C CLUTCH &
WS WASHER
PUMP

Groundsmaster 4000--D/4010--D
Platform Wire Harness Diagram
Sheet 2 of 2
NOTE: THE PLATFORM WIRE HARNESS DIAGRAM IS SHOWN ON TWO (2)
SHEETS. WHEN A CONDUCTOR CONTINUES ON ANOTHER SHEET, A
REFERENCE NUMBER WILL BE IDENTIFIED.

Page 10 -- 11

FUSEBLOCKS
MAXI
FUSES

TO PLATFORM
HARNESS
TO PLATFORM
HARNESS
TO PLATFORM
HARNESS
TO PLATFORM
HARNESS

Groundsmaster 4000--D/4010--D
Rear Wire Harness Drawing
Page 10 -- 12

BLACK

RED/BLACK

BLUE

BLACK

PINK

WHITE

RED

PINK
RED

RED

RED
BLACK

RED

VIOLET

RED
BLACK

BLUE
BLACK
WHITE/BLACK
TO PLATFORM
HARNESS

BROWN/BLACK

TAN/BLACK

GRAY/BLACK
BLUE
PINK/BLACK

RED
BLACK

WHITE
WHITE/ORANGE

TO PLATFORM
HARNESS

YELLOW

RED
PINK

VIOLET

ORANGE
BLACK
BLACK
WHITE/YELLOW

RED/BLACK
BLACK

BROWN
PINK

RED/BLUE

RED/GREEN

WHITE/BLACK

BLACK
BLACK

BROWN/BLACK
TAN/BLACK

GRAY/BLACK

BLACK

PINK
BLACK

PINK

YELLOW/BLUE
BLACK

BLACK
BLACK

BLACK

RED
RED

RED
RED
RED

RED

BLACK

PINK/BLACK

BLACK

YELLOW/BLACK
WHITE/BLUE
GREEN/WHITE
GRAY/GREEN
WHITE
GRAY
GREEN
RED/BLACK
BROWN/WHITE

VIOLET/BLACK
BLACK

RED

TO PLATFORM
HARNESS

Groundsmaster 4000--D/4010--D
Rear Wire Harness Diagram
Page 10 -- 13

FUSEBLOCKS

TO CAB
INTERCONNECT
HARNESS

Groundsmaster 4010--D
Cab Wire Harness Drawing
Page 10 -- 14

BLACK/WHITE

ORANGE/BLACK

ORANGE

WHITE/
BLACK

RED

YELLOW
GRAY
ORANGE

BROWN
VIOLET
PINK

ORANGE/BLACK

BLUE

BLACK

BLUE

BLACK
ORANGE

ORANGE
ORANGE

BLACK
BLACK
WHITE/BLACK

ORANGE/BLACK

RED

VIOLET

RED/WHITE

RED

BLACK

BLACK
GREEN
RED
WHITE/BLACK

RED
BLACK
BLACK

BLACK

BLACK
BLACK

BLACK

VIOLET

WHITE
VIOLET
ORANGE

VIOLET
GRAY
BROWN

BROWN
BLUE

BLUE

VIOLET
BLACK

VIOLET

BLUE

VIOLET

BROWN

VIOLET

BLACK

VIOLET

BLACK

TO CAB
INTERCONNECT
HARNESS

BLACK

Groundsmaster 4010--D
Cab Wire Harness Diagram
Page 10 -- 15

RED
BLACK

WHITE

Groundsmaster 4010--D
Cab Interconnect Wire Harness
Page 10 -- 16

BLACK

BLUE

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Title                           : gm4000-10a
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Page Count                      : 340
Author                          : warwikd

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Toro 4000 D Gm4000 10a User Manual To The Cf6ee562 5749 4857 9f15 D8624eaaeb19

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