M20 Service Manual (S/N 000000 007999) Tennant Rider Floor Sweeper Scrubber Sn 0 007999

2018-06-12

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M20
Service Information Manual

The Safe Scrubbing AlternativeR

HygenicR Fully Cleanable Tanks
FloorSmartt Integrated Cleaning System
R
ES Extended Scrub System

331385
Rev.01 (02-2007)

www.tennantco.com

*331385*

FOR REPLACEMENT PARTS
Identify machine model and serial number.
1. (A) Identify the machine model.
2. (B) Identify the machine serial number from the data plate.
Refer to the TENNANT Parts Manual.
NOTE: Only use TENNANT Company supplied or equivalent parts. Parts and supplies may be ordered
online, by phone, by fax or by mail.

Tennant Company
PO Box 1452
Minneapolis, MN 55440
Phone: (800) 553--8033 or (763) 513--2850
www.tennantco.com
Specifications and parts are subject to change without notice.

M20 331385 (02-2007)

M20 Service Information Manual
Table of Contents
(Page 1 of 2)

page
SAFETY PRECAUTIONS…………………………………………………. v to vi
GENERAL MACHINE INFORMATION
Electrical Component Locator………………………………..……2 to 9
Hydraulic Component Locator………………………………..……10 to 16
14
Scrub Manifold Details………………………………..………
Sweep Manifold Details………………………………..……15
Side Brush Manifold Details……………………………….. 16
Specifications………………………………..………………………17 to 19
Machine Dimensions………………………………..………………19
Basic Troubleshooting………………………………..…………… 20 to 21
MAINTENANCE
Maintenance Check Points………………………………..……… 24
Maintenance Chart………………………………..…………………25 to 26
Lubrication………………………………..………………………… 27
Hydraulics………………………………..…………………………. 29
30
Engine………………………………..…………………………..……
33
Battery………………………………..…………………………..……
Fuses & Relays………………………………..…………………… 33 to 34
Cleaning the Hopper Dust Filter………………………………..… 35
Main Brushes………………………………..………………………35
Side Brush………………………………..………………………… 39
FaST System………………………………..………………………40
Squeegee Blades………………………………..………………… 42
Skirts & Seals………………………………..………………………48
Brakes & Tires………………………………..………………………49
Propelling Motor………………………………..……………………49
Pushing,Towing,& Transporting Machine…………………………50
Machine Jacking………………………………..……………………52
Storage Information………………………………..……………… 52
Pinch Valve Adjustment………………………………..……………53
ELECTRICAL
Electrical Schematic………………………………..……………… 56 to 62
63 to 77
Wiring Harness Detail………………………………..………………
Main Wire Harness………………………………..…………63 to 69
Headlight Wire Harness………………………………..……70
Hopper Wire Harness………………………………..………71
Hopper Cover Wire Harness………………………………. 72
Gas/LPG Engine Wiring………………………………..……73 to 76
FaST Wire Harness………………………………..…………77
Electrical Symbols & Terms………………………………..………78
Touch Panel Detail………………………………..…………………79
Touch Panel LED’s………………………………..…………………80
Option Components………………………………..……………… 81
Key Switch………………………………..………………………… 82
Key OFF Power Distribution………………………………..………83
Key ON Power Distribution………………………………..……… 84
Main Brushes ON………………………………..………………… 85
Scrub Vacuum Fan ON & Squeegees DOWN……………………86
Hopper LIFT………………………………..…………………………87
Hopper LOWER………………………………..……………………88
89
Side Brush ON………………………………..………………………
Sweep Vacuum Fan ON………………………………..………… 90
Shaker Motor ON………………………………..………………… 91
Tank Level Switches………………………………..………………92
Auto Fill Solenoids………………………………..…………………93
94
Detergent Pump & ES Pump………………………………..………
Hopper Door OPEN………………………………..……………… 95
Hopper Door CLOSE………………………………..………………96
97
Horn………………………………..…………………………..………
Forward Propel………………………………..…………………… 98
Reverse Propel………………………………..…………………… 99
M20 331385 (02-2007)

iii

M20 Service Information Manual
Table of Contents
(Page 2 of 2)

page
ELECTRICAL (continued)
Gas/LPG Shutdown Relay (Normal Machine Operation)……… 100
101
Diesel Shutdown Relay (Normal Machine Operation)……………
Gas/LPG Shutdown Relay (Shutdown Mode)……………………102
Diesel Shutdown Relay (Shutdown Mode)……………………… 103
Gas/LPG Starting System ON………………………………..……104
Diesel Starting System ON………………………………..……… 105
Diesel Glow Plugs ON………………………………..…………… 106
Conventional Solution Valves………………………………..…… 107
FaST System ON………………………………..………………… 108
Fuel Level Sensors………………………………..…………………109
Impact, Hydraulic Temperature, & Hydraulic Filter Sensors……110
Gas/LPG Engine Oil Pressure, Temperature, & MIL Systems…111
Diesel Engine Oil Pressure & Temperature Systems……………112
113
Gas/LPG Fuel Pump & Engine Speed Control……………………
Diesel Fuel Pump………………………………..………………… 114
Diesel Engine Speed Control………………………………..…… 115
Enable/Disable Chart………………………………..………………116 to 117
Control Board Connectors………………………………..…………118
Fault Indicators………………………………..…………………… 119
Condition & Warning Indicators………………………………..… 120
Configuration Modes………………………………..………………121 to 124
Diagnostic Modes………………………………..………………… 125 to 126
HYDRAULICS
Hydraulic Schematic………………………………..………………128
Hydraulic Hose, Pump & Valve Drawings…………………………129 to 147
Steering and Propel………………………………..…………129
130
Pumps and Vacuum Fan………………………………..……
132
Brush and Hopper………………………………..……………
Squeegee Lift………………………………..……………… 134
Pumps Group………………………………..……………… 136
138
Cooler and Tubes Group………………………………..……
Reservoir Group………………………………..…………… 140
Scrub/Sweep Manifold Valves Group………………………142
Side Brush Manifold Valves Group…………………………144
Side Brush Hose Group………………………………..……146
Hydraulic Solenoid Valve Details………………………………..…148
General Information………………………………..……………… 149 to 150
Hydraulic Symbols………………………………..………… 149
Pump Flow Rates………………………………..……………150
Abbreviations………………………………..…………………
150
Port Markings………………………………..……………… 150
Operating Matrix………………………………..……………………151
Option Components………………………………..……………… 152
Scrub/Sweep Head Lower………………………………..…………153
Scrub/Sweep Head Lift………………………………..……………154
Squeegees Lower………………………………..…………………155
156
Squeegees Lift………………………………..………………………
Main Brushes ON………………………………..………………… 157
158
Side Brush ON………………………………..………………………
Scrub Vacuum Fan ON………………………………..……………159
Scrub Vacuum Fan & Side Brush ON…………………………… 160
Sweep Vacuum Fan ON………………………………..………… 161
Sweep Vacuum Fan & Side Brush ON……………………………162
Hopper Lift………………………………..………………………… 163
Hopper Lower………………………………..………………………164
Hopper Door Open………………………………..…………………165
Hopper Door Close………………………………..…………………166
Side Brush Lower………………………………..………………… 167
Side Brush Lift………………………………..………………………168
Side Brush Extend………………………………..…………………169
Side Brush Retract………………………………..…………………170
iv

M20 331385 (02-2007)

M20 Safety Precautions
(Page 1 of 2)

The following precautions are used throughout
this manual as indicated in their description:
WARNING: To warn of hazards or
unsafe practices that could result in
severe personal injury or death.
CAUTION: To warn of unsafe practices
that could result in minor or moderate
personal injury.
FOR SAFETY: To identify actions that must be
followed for safe operation of equipment.
Do not use the machine other than described in
this Operator Manual. The machine is not
designed for use on public roads.
The following information signals potentially
dangerous conditions to the operator or
equipment:
WARNING: Flammable materials can
cause an explosion or fire. Do not use
flammable materials in tank.
WARNING: Flammable materials or
reactive metals can cause an explosion
or fire. Do not pickup.
WARNING: Moving belt and fan. Keep
away.
WARNING: Engine emits toxic gases.
Serious injury or death can result.
Provide adequate ventilation.
WARNING: Raised hopper may fall.
Engage hopper support pin.
WARNING: Lift arm pinch point. Stay
clear of hopper lift arms.
WARNING: Burn hazard. Hot surface. Do
NOT touch.

CALIFORNIA PROPOSITION 65
WARNING: Engine exhaust from this
product contains chemicals known to
the State of California to cause cancer,
birth defects, or other reproductive
harm.
FOR SAFETY:
1. Do not operate machine:
-- Unless trained and authorized.
-- Unless operator manual is read and
understood.
-- If it is not in proper operating
condition.
-- In flammable or explosive areas.
-- In areas with possible falling objects
unless equipped with overhead guard.
2. Before starting machine:
-- Check for fuel, oil, and liquid leaks.
-- Keep sparks and open flame away
from refueling area.
-- Make sure all safety devices are in
place and operate properly.
-- Check brakes and steering for proper
operation.
3. When starting machine:
-- Keep foot on brake and directional
pedal in neutral.
4. When using machine:
-- Use brakes to stop machine.
-- Go slow on inclines and slippery
surfaces.
-- Use care when reversing machine.
-- Move machine with care when hopper
is raised.
-- Make sure adequate clearance is
available before raising hopper.
-- Do not carry passengers on machine.
-- Always follow safety and traffic rules.
-- Report machine damage or faulty
operation immediately.
-- Follow mixing and handling
instructions on chemical containers.

CAUTION: LPG engine will run for a
few seconds after key is turned off.
Apply parking brake before leaving
machine.

M20 331385 (02-2007)

M20 Safety Precautions
(Page 2 of 2)

5. Before leaving or servicing machine:
-- Stop on level surface.
-- Set parking brake.
-- Turn off machine and remove key.
6. When servicing machine:
-- Avoid moving parts. Do not wear loose
jackets, shirts, or sleeves.
-- Block machine tires before jacking
machine up.
-- Jack machine up at designated
locations only. Support machine with
jack stands.
-- Use hoist or jack that will support the
weight of the machine.
-- Wear eye and ear protection when
using pressurized air or water.
-- Disconnect battery connections before
working on machine.
-- Avoid contact with battery acid.
-- Avoid contact with hot engine coolant.
-- Do not remove cap from radiator when
engine is hot.
-- Allow engine to cool.
-- Keep flames and sparks away from
fuel system service area. Keep area
well ventilated.
-- Use cardboard to locate leaking
hydraulic fluid under pressure.
-- Use Tennant supplied or approved
replacement parts.
7. When loading/unloading machine
onto/off truck or trailer:
-- Turn off machine.
-- Use truck or trailer that will support
the weight of the machine.
-- Use winch. Do not drive the machine
onto/off the truck or trailer unless the
load height is 380 mm (15 in) or less
from the ground.
-- Set parking brake after machine is
loaded.
-- Block machine tires.
-- Tie machine down to truck or trailer.

M20 331385 (02-2007)

M20 G

GENERAL
MACHINE
INFORMATION

M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 1 of 8)

HOPPER LATCH
SOLENOID SOL-9

FR
T
ON
FRONT

T
FRON

HOPPER DOWN SENSE SWITCH S-6
2

RECOVERY TANK FULL SWITCH S-15
M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 2 of 8)

BATTERY

FRONT

FR
ON
T

SOLUTION TANK FULL SWITCH S-14

FRONT

FRON

FUSE/RELAY PANEL

FRO
NT

HORN
FRONT

FR
O

AUTO FILL SOLENOID VALVES
SOL-1, SOL-2

M20 331385 (02-2007)

SOLUTION TANK EMPTY SWITCH S-19

M20 Electrical Component Locator
(Page 3 of 8)

IGNITION SWITCH
HORN SWITCH S-22

FRONT

RECOVERY TANK HALF FULL SWITCH S-16

ES PUMP

M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 4 of 8)

SHAKER MOTOR

HOPPER THERMAL SENTRY SWITCH S-9

T
ON
R
F

FRONT

SWEEP FILTER CLOGGED SWITCH S-18
(VIEWED BEHIND BUMPER)
M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 5 of 8)

SWEEP FAN VALVE SV9
(BESIDE ENGINE FUSE PANEL)

SCRUB VALVE
SV1, SV2, SV3, SV4,SV6, SV7

SWEEP VALVE
SV13, SV14, SV15

FRONT

DETERGENT PUMP
T
ON
FR

FRONT

SPRAY NOZZLE PUMP
FRONT

SIDE BRUSH VALVE
SV8, SV10, SV11, SV12
6

FRO

PROPEL PEDAL POSITION SENSOR
M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 6 of 8)

FaST COMPONENTS

HYDRAULIC FILTER CLOGGED SWITCH S-17

FRONT

LPG LOW FUEL PRESSURE SWITCH S-8
M20 331385 (02-2007)

HYDRAULIC OIL TEMPERATURE SENSOR S-20
(BACK SIDE)
7

M20 Electrical Component Locator
(Page 7 of 8)

Gas / LPG Engine

Coolant
Temperature
Switch
ON

Coolant
Temperature
Sensor

Crankshaft
Position
Sensor

Oil
Pressure
Switch

M20 331385 (02-2007)

M20 Electrical Component Locator
(Page 8 of 8)

Diesel Engine

Coolant
Temperature
Sensor

FRO

Crankshaft
Position
Sensor

Oil
Pressure
Switch

M20 331385 (02-2007)

M20 Hydraulic Component Locator
(Page 1 of 7)

SIDE BRUSH MOTOR
FRON
T

FRONT

SWEEP FAN
MOTOR

SCRUB FAN
MOTOR

NT
FRO

N
RO

T
FRON

T
ON
FR

MAIN BRUSH MOTOR (REAR)

PROPEL MOTOR

LEFT SIDE SQUEEGEE LIFT CYLINDER
10

M20 331385 (02-2007)

M20 Hydraulic Component Locator
(Page 2 of 7)

HOPPER LIFT CYLINDER

SCRUB HEAD LIFT CYLINDER

SIDE BRUSH EXTEND CYLINDER

FRONT BUMPER
(INNER VIEW)
FRONT

FR
T
ON

ON
T

FRONT

RIGHT SIDE SQUEEGEE LIFT CYLINDER
FRONT

SIDE BRUSH LIFT CYLINDER
NT
FRO

MAIN BRUSH MOTOR (FRONT)
M20 331385 (02-2007)

M20 Hydraulic Component Locator
(Page 3 of 7)

SWEEP FAN VALVE SV9
(BESIDE ENGINE FUSE PANEL)

SCRUB MANIFOLD
SV1, SV2, SV3, SV4,SV6, SV7
RV1, RV2, CV1, PC1, PC2
FRO

See pages 14, 15 and 16
for more information on
the Scrub, Sweep, and
Side Brush manifolds

FRONT

SWEEP MANIFOLD
SV13, SV14, SV15,
RV3, PC5, PC6
FRO

FRONT

ACCESSORY PUMPS

FRONT

SIDE BRUSH MANIFOLD
SV8, SV10, SV11, SV12, PR1, PC8
12

PROPEL PUMP
M20 331385 (02-2007)

M20 Hydraulic Component Locator
(Page 4 of 7)

FR
ON
T

STEERING CYLINDER

FRONT

HOPPER DOOR CYLINDER

M20 331385 (02-2007)

REAR SQUEEGEE LIFT CYLINDER
(VIEWED BEHIND BUMPER)

M20 Hydraulic Component Locator
(Page 5 of 7)

SCRUB MANIFOLD DETAILS

C
0.0 V1, Righ
4
0.0 6 in G5, t sid
e:
P
55
(
in 1.17 1, P2
(1.
40 mm) , P7,
mm or
) o ifice
rifi
ce

SV1
RV1

G Ba
6 , ck
PC s
1, ide:
PC
2

O
FR

C1
SV6

G1
C2

SV7

RV2

SV3

SV4

SV2
Bottom:
T1, T2

M20 331385 (02-2007)

M20 Hydraulic Component Locator
(Page 6 of 7)

SWEEP MANIFOLD DETAILS

O
FR

Ba
ck
PC sid
5 e:

FRO

SV13, SV14
RV3
SV15

C10
PC6

M20 331385 (02-2007)

C12 &
OR1 0.030 in
(0.76 mm) orifice

G11

C11 &
OR2 0.040 in
(1.02 mm) orifice

M20 Hydraulic Component Locator
(Page 7 of 7)

SIDE BRUSH MANIFOLD DETAILS

FRONT

G13

SV10

C8
G7

SV11

C7
PR1

Front sid
e:
PC8

G10

SV12

C5
T6
SV8

FRO

P3
M2
P4 &
OR3 0.040 in
(1.02 mm) orifice
16

M20 331385 (02-2007)

M20 Specifications
(Page 1 of 3)

GENERAL MACHINE DIMENSIONS/CAPACITIES
Item

Dimension/capacity

Length

2410 mm (95 in)

Height

1470 mm (58 in)

Height (with overhead guard)
Width/frame (roller to roller)

2120 mm (83.5 in)
1270 mm (50 in)

Width (rear squeegee)

1300 mm (51 in)

Width (with side brush)

1470 mm (58 in)

Cleaning path width (Main brush length)

1020 mm (40 in)

Cleaning path width (with scrubbing side brush)

1370 mm (54 in)

Cleaning path width (with sweeping side brush)
Main brush diameter (2)

1420 mm (56 in)
300 mm (12 in)

Side brush diameter (scrubbing)

410 mm (16 in)

Side brush diameter (sweeping)

530 mm (21 in)

Solution tank capacity

212 L (56 gallons)

Recovery tank capacity

276 L (73 gallons)

Debris hopper volume capacity

110 L (3.9 ft3)

Debris hopper weight capacity

177 kg (390 lbs)

Dump height (variable to)

1520 mm (60 in)

Minimum ceiling dump height

2500 mm (98 in)

Weight -- empty
GVWR

1497 Kg (3300 lbs)
2359 Kg (5200 lbs)

Transport ground clearance

80 mm (3 in)

Operating Sound Level At Operator Ear

81 r1.5 dBA

Vibration level at steering wheel does not exceed

0.2 m/s@

GENERAL MACHINE PERFORMANCE
Item

Measure

Minimum aisle turn

2790 mm (110 in)

Travel speed forward (maximum)

12.9 Km/h (8 mph)

Travel speed reverse (maximum)

4.8 Km/h (3 mph)

Maximum rated climb and descent at GVWR

10_/18%

Maximum rated climb and descent angle when scrubbing

8_/14%

HYDRAULIC SYSTEM
System

Capacity

Hydraulic reservoir

38 L (10 gal)

Hydraulic total

45 L (12 gal)

Fluid Type
TENNANT part no. 65869 -- above 7_ C (45_ F)
TENNANT part no. 65870 -- below 7_ C (45_ F)

STEERING
Type

Power source

Emergency steering

Front wheel, hydraulic cylinder
and rotary valve controlled

Hydraulic accessory pump

Manual hydraulic

M20 331385 (02-2007)

M20 Specifications
(Page 2 of 3)

POWER TYPE

Engine
GM 1.6

Type
Piston

Ignition
Distributorlesstype spark
Displacement
1600 cc (98 cu in)
Fuel
Gasoline, 87 octane
minimum, unleaded
Fuel tank: 42 L (11.2 gal)
LPG,,
F l ttank:
Fuel
k 15 kg
k (33 lb)

Cycle
4

Aspiration
Natural

Cylinders Bore
Stroke
4
79 mm
81.5 mm
(3.11 in) (3.21 in)
Net power, governed
Net power, maximum
23.2 kw (32 hp) @ 2400 rpm
39.5 kw (53 hp) @
4000 rpm
Cooling system
Electrical system
Water/ethylene glycol
12 V nominal
antifreeze
75 A alternator

950 + 50 rpm

Total: 7.5 L (2 gal)
Radiator: 3.8 L (1 gal)
(Fast) governed speed, under
load
2400 + 50 rpm

Spark plug gap

Valve clearance, cold

1 mm (0.04 in)

No Adjustment
OHC Engine

Engine lubricating oil
with filter
3.5 L (3.7 qt) 5W30
SAE--SG/SH

Idle speed, no load

Engine
Type
Kubota V1505--B Piston

Firing order
1--3--4--2

Ignition

Cycle

Aspiration

Cylinders Bore

Stroke

Diesel

Natural

78.4 mm
(3.08 in)

78 mm
(3.07 in)

Displacement

Net power, governed

Net power, maximum

1500 cc (91.4 cu in)

24.6 kw (34 hp) @ 2400 rpm

27.2 kw (37.5 hp) @
3000 rpm

Fuel
Diesel
Fuel tank: 42 L (11.2 gal)

Cooling system

Electrical system

Water/ethylene glycol
antifreeze

12 V nominal

Total: 7.5 L (2 gal)

37 A alternator

Radiator: 3.8 L (1 gal)
Idle speed, no load

(Fast) governed speed, under
load

Engine lubricating oil
without filter

950 + 50 rpm

2400 + 50 rpm

6 L (6.35 qt)
Diesel rated engine oil
above CD grade only

BRAKING SYSTEM

Type

Operation

Service brakes

Mechanical drum brakes (2), one per rear wheel,
cable actuated

Parking brake

Utilize service brakes, cable actuated

M20 331385 (02-2007)

M20 Specifications
(Page 3 of 3)

TIRES
Location
Front (1)

Type
Solid

Size
140 mm x 460 mm (5.5 in x 18 in)

Rear (2)

Solid

90 mm x 410 mm (3.5 in x 16 in)

FaST SYSTEM
Item

Measure

Solution pump

12 Volt DC, 11A, 11.6 LPM (3.0 GPM) open flow,
45 psi bypass setting

Low solution flow rate

2.7 LPM (0.7 GPM)

High solution flow rate

5.4 LPM (1.4 GPM)

Detergent pump

12 Volt DC

Low concentrate flow rate

2.6 CC/Minute (0.085 Liquid Ounces/Minute)

High concentrate flow rate

5.2 CC/Minute (0.17 Liquid Ounces/Minute)

Air pump

12 Volt DC, 0.6 Maximum Amp draw

Air pump flow rate

8.7 LPM (0.3 CFM) open flow

MACHINE DIMENSIONS

M20 331385 (02-2007)

T20 Basic Troubleshooting
(Page 1 of 2)

MACHINE TROUBLESHOOTING
Problem

Cause

Remedy

Trailing
g water--poor
p
or no
water
t pickup
i k

Scrub vacuum fan turned off

Turn on vacuum fan

Worn squeegee blades

Rotate or replace squeegee blades

Squeegee out of adjustment

Adjust squeegee

No detergent in solution tank
causing squeegee to chatter

Add detergent to solution tank

Vacuum hose clogged

Flush vacuum hoses

Vacuum screen dirty

Clean vacuum screen

Scrub vacuum fan cover seals
worn

Replace seals

Debris caught in squeegee

Remove debris

Vacuum hose to squeegee or
recovery tank disconnected or
damaged

Reconnect or replace vacuum hose

Recovery tank cover not
completely closed

Check for obstructions and make
sure cover is closed properly

Vacuum fan / squeegee button
turned off

Turn on Vacuum fan / squeegee
button

Recovery tank full

Drain recovery tank

Foam filling
g recoveryy tank

Empty recovery tank

Scrub vacuum fan will not
turn on

Use less detergent/or use
defoamer
Recovery tank sensor dirty or stuck Clean or replace sensor
Little or no solution flow to
th fl
the
floor (Conventional
(C
ti
l
Scrubbing Mode)

Solution tank empty

Fill solution tank

Solution flow turned off

Turn on solution flow

Solution supply lines plugged

Flush solution supply lines

Excessive dusting

Brush skirts and dust seals worn,
damaged, or out of adjustment

Replace or adjust brush skirts and/
or brush seals

Hopper dust filter clogged

Shake and/or replace dust filter

Sweep vacuum fan seal damaged

Replace vacuum fan seal

Sweep vacuum fan failure

Call Tennant service representative

Thermo--Sentry tripped

Allow Therm--Sentry to cool

Worn brush bristles

Replace brushes

Brush pressure set too light

Increase brush pressure

Poor sweeping
p g performance
p

Main brushes not properly adjusted Adjust brushes
Debris caught in main brush drive
mechanism

Remove debris from main brush
drive mechanism

Main and/or side brush drive failure Call Tennant service representative

Hopper is full

Empty hopper

Hopper lip skirts worn or damaged

Replace lip skirts

Improper main brushes

Call Tennant service representative

M20 331385 (02-2007)

T20 Basic Troubleshooting
(Page 2 of 2)

Problem
Poor scrubbing
g performance
p

FaST System does not
t
operate

Cause

Remedy

1--STEP Scrub button not on

Turn on 1--STEP Scrub button

Improper detergent or brushes

Call Tennant service representative

Solution tank empty

Fill solution tank

Debris caught on main brushes

Remove debris

Worn main brushes

Replace brushes

Brush pressure set too light

Increase brush pressure

FaST button is turned off

Turn on the FaST button

Clogged FaST--PAK supply hose
and/or connector

Soak connector and hose in warm
water and clean

FaST--PAK carton is empty or not
connected

Replace FaST--PAK carton and/or
connect supply hose

FaST system is not primed

To prime, operate the FaST
solution system for a few minutes

Clogged filter screen

Drain solution tank, remove and
clean filter screen

Blown fuse

Call Tennant service representative

Faulty solution pump

Call Tennant service representative

ES System does not operate ES button is turned off

Sweeping or Scrubbing
f
ti
d nott turn
t
functions
do
on

M20 331385 (02-2007)

Turn on ES button

ES sensor in tank dirty

Clean sensor

Clogged ES pump filter

Clean ES filter

Water level in recovery tank too
low

Fill recovery tank about half full

Water level in solution tank too low

Fill solution tank

Hopper is up

Completely lower hopper

Fire in the hopper

Shut off machine. Extinguish fire.
If necessary, call emergency
personnel.

Recovery tank full

Press the Scrub vacuum
fan/squeegee button for one
minute of extended water pickup.
Empty recovery tank.
ES models: activate the ES system
to prevent this.

M20 331385 (02-2007)

M20
MAINTENANCE
Information

BEFORE CONDUCTING TESTS:
* Read and Follow ALL Safety Warnings and Precautions as
mentioned at the beginning of this manual
* Always use an ESD (Electrostatic Discharge) strap when working
near the Control Board
* Be cautious when working near Control Board – Battery voltage is
always present, even with Key OFF
* Always unhook Battery when removing or replacing components

DURING TESTS:
* Call Technical Services if Diagnostic Time Exceeds One Hour With
Unknown Cause or Course of Action

NOTE: Troubleshooting charts may be shown with optional equipment.
The optional equipment may not be specified in these charts. Some machines
may not be equipped with all components shown.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 1 of 30)

MAINTENANCE

12
13

7
10

2
11

14
1

3
18

5
6

M20 331385 (02-2007)

M20 Maintenance Information
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MAINTENANCE
Interval
Dailyy

Key
1

10
8, 9
3

Description
Engine
g

Hydraulic fluid reservoir
Tank cover seals
Main brushes

Side brush (option)
( p
)

5
6

Hopper dust filter
Rear Squeegee
q
g Blade

7
8
8

Side Squeegee Blades
Recovery tank
Recovery tank, ES mode
(option)
Solution tank, ES mode
(option)
Hopper

20 Hours

50 Hours

-------

1
1
1
2
1
1

Clean

Clean hopper, debris screen,
and hose

Hopper dust filter

Check for damage, clean,
replace if necessary

16
3
13

FaST filter screen
Main brushes
Front wheel

Clean
Rotate front to rear
Torque wheel nuts (after initial
50 hours only)

----

1
2
1

Battery

Clean and tighten battery cable
connections (after initial 50
hours only)

Radiator

19
1
-6
6
2

Hydraulic cooler
Engine
Tires
Rear squeegee casters
Rear squeegee
Scrub head skirt

Clean core exterior
Check coolant level
Clean core exterior
Change oil and filter
Check for damage
Lubricate
Check leveling
Check for damage or wear

-WG
-EO
-SPL
---

1
1
1
1
3
2
1
1

100 Hours

M20 331385 (02-2007)

Procedure
Check oil level
Check coolant level in reservoir
Check belt tension
Check fluid level
Check for damage or wear
Check for damage and wear
Check brush pattern
Check for damage and wear
Check squeegee blade for
damage and wear
Shake to clean
Check for damage and wear
Check deflection
Check for damage and wear
Clean
Clean ES filter

No. of
Lubricant/ Service
Fluid
Points
EO
1
WG
1
-1
HYDO
1
-3
-2
-2
-1
-1

M20 Maintenance Information
(Page 3 of 30)

MAINTENANCE
Interval
200 Hours

Key
12
1, 17
12
1, 19
11
11

M
400 Hours

800 Hours

14
5
18
16
1

Hopper lift arm pivots
Hopper door pivots
Hopper lift arm latch
FaST air filter
Engine

Hydraulic
y
reservoir

Engine
g

-1, 19
13
13

1600
Hours

Description
Front wheel support
bearings
Torque tube
Steering cylinder
Radiator hoses and clamps
Parking brake
Brake pedal

Hydraulic hoses
Cooling system
Propelling motor
Front wheel

Procedure
Lubricate

No. of
Lubricant/ Service
Fluid
Points
SPL
2

Lubricate
Lubricate
Check for tightness and wear
Check adjustment
Check adjustment

SPL
SPL
----

4
1
2
1
1

Lubricate
Lubricate
Clean and lubricate
Clean
Clean and re--gap or replace
spark plugs (Gas/LPG)
Replace air filter
Replace fuel filter (LPG/Diesel)
Change hydraulic fluid
Replace strainer outlet
Replace filler cap
Replace fluid filter
Check timing belt (Gas,LPG)
Replace fuel filter (Gasoline)
Check for wear and damage
Flush
Torque shaft nut
Torque wheel nuts

SPL
SPL
SPL
---

2
2
1
1
4

--HYDO

----WG
---

1
1
1
1
1
1
1
1
All
2
1
1

Battery

Clean and tighten battery cable
connections

Engine

Replace timing belt (Gas,LPG)

LUBRICANT/FLUID
EO . . . . . Engine oil, Gas/LPG: 10W30 SAE--SG/SH only; Diesel: Rating above CD grade only
HYDO . Tennant or approved hydraulic fluid
WG . . . Water and ethylene glycol anti-freeze, --34_ C (--30_ F)
SPL . . . Special lubricant, Lubriplate EMB grease (Tennant part number 01433--1)
NOTE: More frequent maintenance intervals may be required in extremely dusty conditions.

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LUBRICATION

SQUEEGEE CASTER BEARINGS
Lubricate the squeegee caster bearings after
every 100 hours of operation.

GAS/LPG ENGINE OIL
Check the engine oil level daily. Change the oil
and oil filter after every 100 hours of operation.

M
STEERING CYLINDER BEARING

Fill the engine with oil until the oil is between the
indicator marks on the dipstick. DO NOT fill past
the top indicator mark. The engine oil capacity is
3.5 L (3.7 qt) with oil filter.

Lubricate the steering cylinder after every 200
hours of operation. The steering cylinder bearing
is located next to the front wheel support.

DIESEL ENGINE OIL
Check the engine oil level daily. Change the oil
and oil filter after every 100 hours of operation.
Use engine oil with a diesel rating above CD
grade only.

FRONT WHEEL SUPPORT BEARING
Lubricate the front wheel support bearings after
every 200 hours of operation. Both front wheel
support grease fittings are located underneath the
frame support plate.

Fill the engine with oil until the oil is between the
indicator marks on the dipstick. DO NOT fill past
the top indicator mark. The engine oil capacity is
6 L (6.35 qt) with oil filter.

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M20 Maintenance Information
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HOPPER LIFT ARM PIVOTS

LIFT ARM LATCH

Lubricate the hopper lift arm pivots after every
200 hours of operation.

Clean and lubricate the lift arm latch and latch
stop after every 200 hours of operation.

HOPPER DOOR PIVOTS

TORQUE TUBES

Lubricate the hopper door pivots after every 200
hours of operation.

Lubricate the torque tubes after every 200 hours
of operation. The torque tube grease fittings on
the operator side of the machine are located
beneath the fuel tank.

On the other side of the machine the torque tube
grease fittings are located beneath the propel
pump.

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HYDRAULICS
Check the hydraulic fluid level at operating
temperature daily. The hydraulic fluid level should
be between the two lines on the hydraulic gauge.
The hopper must be down when checking
hydraulic fluid level.

Replace the hydraulic fluid filter after every 800
hours of operation or if the hydraulic reservoir
gauge is in the yellow/red zone when the reservoir
hydraulic fluid is approximately 32_ C (90_ F).

M
Replace the hydraulic strainer outlet after every
800 hours of operation.
HYDRAULIC FLUID
ATTENTION! Do not overfill the hydraulic fluid
reservoir or operate the machine with a low
level of hydraulic fluid in the reservoir.
Damage to the machine hydraulic system may
result.
Drain and refill the hydraulic fluid reservoir with
new hydraulic fluid after every 800 hours of
operation.
Replace the filler cap after every 800 hours of
operation. Apply a light film of hydraulic fluid onto
the filler cap gasket before installing the cap onto
the reservoir.

Tennant hydraulic fluid is specially selected to
meet the needs of Tennant machines. There are
two fluids available for different temperature
ranges:
Tennant part no.

Ambient Temperature

65869

above 7_ C (45_ F)

65870

below 7_ C (45_ F)

High temperature fluids have a higher viscosity
(thicker) and should only be used in high
temperature environments. Low temperature
fluids have a lower viscosity (thinner) and should
only be used in cold temperature environments.
Select the appropriate hydraulic fluid for the
environment where the machine is operated.
Using improper hydraulic fluids can cause
premature failure of hydraulic components.
If using a locally-available hydraulic fluid, be sure
the specifications match Tennant hydraulic fluid
specifications. Substitute fluids can cause
premature failure of hydraulic components.
ATTENTION! Hydraulic components depend
on system hydraulic fluid for internal
lubrication. Malfunctions, accelerated wear,
and damage will result if dirt or other
contaminants enter the hydraulic system.

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M20 Maintenance Information
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HYDRAULIC HOSES
Check the hydraulic hoses after every 800 hours
of operation for wear or damage.
FOR SAFETY: When servicing machine, use
cardboard to locate leaking hydraulic fluid
under pressure.
High pressure fluid escaping from a very small
hole can almost be invisible, and can cause
serious injuries.

The cooling system must be completely filled with
coolant to keep the engine from overheating.
When filling the cooling system, open the drain
cocks to bleed the air from the system.
Location of drain cock on LPG machines.

00002

Consult a physician immediately if injury results
from escaping hydraulic fluid. Serious infection or
reaction can occur if proper medical treatment is
not given immediately.
Contact a mechanic or supervisor if a leak is
discovered.
ENGINE
COOLING SYSTEM

Location of drain cock on gasoline machines.
Remove the panel from operators compartment to
access the drain cock.

FOR SAFETY: When servicing machine, avoid
contact with hot engine coolant.
Check the coolant level in the reservoir daily. The
coolant level must be between the two indicator
marks when the engine is cold.
FOR SAFETY: When servicing machine, do
not remove cap from radiator when engine is
hot. Allow engine to cool.
Check the coolant level in the radiator after every
100 hours of operation. Refer to the label on the
coolant container for water/coolant mixing
instructions.

Flush the radiator and the cooling system after
every 800 hours of operation.
30

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Location of drain cock on diesel machines..

AIR FILTER
Replace the air filter after every 400 hours of
operation.

Check the radiator hoses and clamps after every
200 hours of operation. Tighten loose clamps.
Replace damaged hoses and clamps.
FUEL FILTER (LPG)
Replace the LPG fuel filter after every 400 hours
of operation.
FOR SAFETY: When servicing machine, keep
flames and sparks away from fuel system
service area. Keep area well ventilated.

Check the radiator core exterior and hydraulic
cooler fins for debris after every 100 hours of
operation. Blow or rinse all dust through the grille
and radiator fins, in the opposite direction of
normal air flow. Be careful to not bend the cooling
fins when cleaning. Clean thoroughly to prevent
the fins from becoming encrusted with dust. To
avoid cracking the radiator, allow the radiator and
cooler fins to cool before cleaning.
Disassemble the fuel lock off valve to access the
LPG fuel filter.

FOR SAFETY: When servicing machine, wear
eye and ear protection when using
pressurized air or water.

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FUEL FILTER (Gasoline)

FUEL LINES (DIESEL)

Replace the gasoline fuel filter after every 800
hours of operation.

Check the fuel lines every 50 hours of operation.
If the clamp band is loose, apply oil to the screw
of the band and securely tighten the band.

FOR SAFETY: When servicing machine, keep
flames and sparks away from fuel system
service area. Keep area well ventilated.

M
FUEL FILTER (DIESEL)
Replace the diesel fuel filter after every 400
hours of operation.

The diesel rubber fuel lines can become worn--out
whether the engine has been used much or not.
Replace the fuel lines and clamp bands every two
years.

FOR SAFETY: When servicing machine, keep
flames and sparks away from fuel system
service area. Keep area well ventilated.

FOR SAFETY: When servicing machine, keep
flames and sparks away from fuel system
service area. Keep area well ventilated.
If the fuel lines and clamp bands are found worn
or damaged before two years’ time; replace or
repair them at once. Bleed the fuel system after
replacement of any fuel lines, see PRIMING THE
FUEL SYSTEM. When the fuel lines are not
installed, plug both ends with clean cloth or paper
to prevent dirt from entering the lines. Dirt in the
lines can cause fuel injection pump malfunction.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 10 of 30)

PRIMING THE DIESEL FUEL SYSTEM

TIMING BELT

Typical diesel fuel systems require priming to
remove pockets of air from the fuel lines and fuel
components. This is usually required after running
out of fuel, changing fuel filter elements or
repairing a fuel system component. Air in the fuel
prevents smooth engine operation.

Check the timing belt after every 800 hours of
operation.
Replace the timing belt after every 2000 hours of
operation.

This fuel system however is self-priming. The
return line comes from the top of the injector that
allows the air to escape through the return line.

BATTERY

ENGINE BELT

Clean and tighten the battery connections after
the first 50 hours of operation and after every 800
hours after that. Do not remove the vent plugs
from the battery or add water to the battery.

Check the belt tension daily. Adjust tension as
necessary. Proper belt tension is 13 mm (0.50 in)
from a force of 4 to 5 kg (8 to 10 lb) applied at the
mid-point of the longest span.

FOR SAFETY: When servicing machine, avoid
contact with battery acid.
WARNING: Moving belt and fan. Keep
away.

FUSES AND RELAYS

SPARK PLUGS

RELAY PANEL FUSES AND RELAYS

Clean or replace, and set the gap of the spark
plugs after every 400 hours of operation. The
proper spark plug gap is 1 mm (0.042 in).

Fuses are one-time protection devices designed
to protect the wire harness by stopping the flow of
current in the event of a circuit overload. Relays
switch the electrical power going to the machine
electrical systems on/off. Remove the relay panel
cover to access fuses and relays.

M20 331385 (02-2007)

M20 Maintenance Information
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Refer to the table below for the fuses and circuits
protected.

Fuse

Rating

Circuit Protected

FU1

15 A

Auxiliary Relays/Engine Controls

FU2

15 A

Shaker

FU3

15 A

Horn

FU4

15 A

Not Used

FU5

15 A

Scrub Vacuum/Main Brush/
Squeegee Down/Hopper Up

FU6

15 A

Enable/Side Brush/Sweep Vacuum

FU7

15 A

Solution/Hopper Latch and Door/
Auto Fill/Reverse/Shaker

FU8

15 A

ES/FaST/Detergent/
Hopper Down/Spray Wand

FU9

15 A

Lights

FU10

15 A

Unswitched B+ for controller board

FU11

15 A

Not Used: Options

FU12

15 A

Spray Nozzle Pump

FU13

15 A

Not Used

FU14

15 A

Not Used

Refer to the table below for the relays and circuits
controlled.

Relay

Rating

Circuit Controlled

12 VDC, 40 A

Auxiliary 1

12 VDC, 40 A

Auxiliary 2

12 VDC, 40 A

Shaker

12 VDC, 40 A

Reverse

12 VDC, 40 A

Horn

12 VDC, 40 A

Shutdown

12 VDC, 40 A

Starter

12 VDC, 40 A

Not Used

12 VDC, 40 A

Not Used

M10

12 VDC. 40 A

Spray Wand (Separate Relay)

ENGINE HARNESS FUSES AND RELAYS
The engine harness fuses and relays are located
in the fuse box on the side panel inside the engine
compartment. Refer to the fuse box cover for
locations of engine harness fuses and relays.

NOTE: Always replace a fuse with a fuse of the
same
amperage. Extra 15 Amp fuses are
.
provided inside the relay panel drawer on the
relay panel.
Refer to the diagram below for locations of the
fuses and relays on the relay panel. The M10
relay for the optional spray nozzle is located
behind the battery.

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M20 Maintenance Information
(Page 12 of 30)

CLEANING THE HOPPER DUST FILTER

MAIN BRUSHES

Shake the dust filter before emptying the hopper
and at the end of every shift. Inspect and clean
the filter after every 20 hours of operation.
Replace damaged dust filters.

Check the main brushes daily for tangled wire or
string, wear, damage, and adjustment.

NOTE: The dust filter may need to be cleaned at
more frequent intervals if the machine is used in
extremely dusty conditions.
Use one of the following methods to clean the
dust filter:

Replace the brushes if large portions of the
bristles are missing or if the remaining bristles are
19 mm (0.75 in) or less in length.
For optimal cleaning performance, rotate the
brushes front to rear after every 50 hours of
operation.

SHAKING--Press the filter shaker button.

NOTE: Replace brushes in sets of two. Otherwise
one scrub brush may scrub more aggressively
than the other.

TAPPING--Tap the filter, with the dirty side down,
gently on a flat surface. Do not damage the
edges of the filter. The filter will not seal properly
in the filter frame if the edges of the filter are
damaged.

REPLACING OR ROTATING THE MAIN
BRUSHES

AIR--Always wear eye protection when using
compressed air. Blow air through the dust filter
opposite the direction of the arrows. Never use
more than 690 kPa (100 psi) of air pressure and
never hold the nozzle closer than 50 mm (2 in) to
the filter. This may be done with the dust filter in
the machine.
FOR SAFETY: When servicing machine, wear
eye and ear protection when using
pressurized air or water.

The front brush can be accessed on the left side
of the machine and rear brush can be accessed
on the right side of the machine.
1. Raise the scrub head.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Open the outer brush doors.

WATER--Rinse the dust filter with a low pressure
garden hose through the dust filter opposite the
direction of the arrows.
NOTE: If water is used to clean the dust filter, be
sure the filter is completely dry before reinstalling
it into the hopper. Do Not reinstall a wet dust
filter.
THERMO--SENTRY
The Thermo--Sentry, located inside the
hopper, senses the temperature of the air pulled
up from the hopper. If there is a fire in the hopper,
the Thermo--Sentry stops the vacuum fan and
cuts off the air flow. The Thermo--Sentry
automatically resets after cooling down.

M20 331385 (02-2007)

M20 Maintenance Information
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3. Open the inner brush doors.

6. Install the new or rotated brushes by pushing
down on the ends while sliding them onto the
drive motor hubs.

M
4. Remove the brush idler plates.
7. If rotating the existing brushes, only rotate
front to rear. Do NOT rotate end--for--end.

Before

After

5. Pull the brushes out from the scrub head.
8. Reinstall the brush idler plates.
9. Close the inner and outer brush doors.
10. Check and adjust the brush pattern if needed.
Refer to CHECKING AND ADJUSTING THE
MAIN BRUSH PATTERN.

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M20 Maintenance Information
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CHECKING THE MAIN BRUSH PATTERN
1. Apply chalk, or a similar marking material, to
a smooth and level section of the floor.

7. If the brush patterns are tapered, see
ADJUSTING THE MAIN BRUSH TAPER
section of this manual.

NOTE: If chalk or other material is not available,
allow the brush to spin on the floor for two
minutes. A polish mark will remain on the floor.
2. Raise the scrub head, then position the
brushes over the chalked area.
3. Set the parking brake.
4. Press the 1--STEP Sweep button to lower the
scrub head. Set the brush pressure to the
lowest setting and allow the brushes to
operate for 15 to 20 seconds. Keep the scrub
head in one spot in the chalked area.
5. Raise the scrub head, release the parking
brake, and drive the machine away from the
chalked area.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.

10652

8. The brush patterns should be 75 to 130 mm
(3 to 5 in) wide with the brushes in the
lowered position and both patterns should be
the same width. If the width of the brushes is
not the same, see ADJUSTING THE MAIN
BRUSH WIDTH section of this manual.

6. Observe the brush patterns. If the brush
pattern is the same width across the entire
length of each brush and both brushes are the
same width, no adjustment is necessary.

10653

10355

M20 331385 (02-2007)

M20 Maintenance Information
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ADJUSTING THE MAIN BRUSH TAPER
1. Loosen the four mounting bolts on the brush
drive housing.

ADJUSTING THE MAIN BRUSH WIDTH
1. Adjust the length of the drag links on both
sides of the scrub head. Lengthen the drag
links to increase the rear brush pattern width.
Shorten the drag links to increase the front
brush pattern. Always adjust the nut on each
drag link an equal number of turns.
NOTE: Two full turns of the drag link adjustment
bolt will change the brush pattern approximately
25 mm (1 in).

M
2. Move the brush drive housing up to decrease
the pattern width on that side of the scrub
head or down to increase the pattern width on
that side of the scrub head.
3. Tighten the mounting bolts.
4. Recheck the pattern. Readjust if necessary.
2. Recheck the pattern. Readjust if necessary.

NOTE: If replacing Drag Link, refer to
diagram below to set adjustment to factory
specifications, then adjust as necessary to
obtain equal front and rear brush pattern
widths.

7- 9/16 in.
(19.2 cm)

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M20 Maintenance Information
(Page 16 of 30)

SIDE BRUSH (OPTION)
Check the side brush daily for wear or damage.
Remove any tangled string or wire from the side
brush or side brush drive hub.
REPLACING THE SIDE BRUSH
Replace the side brush when it no longer cleans
effectively or when the remaining bristles are
19 mm (0.75 in) or less in length for the scrub
brush or 64 mm (2.5 in) or less in length for the
sweep brush. The side brush may be changed
sooner if sweeping light litter. The bristles may be
worn shorter if sweeping heavy debris.

1. If necessary, raise the side brush.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Turn the brush until the spring handles are
visible through the access hole in the side
brush assembly.
3. Squeeze the spring handles and let the side
brush drop to the floor.

4. Remove the side brush from underneath the
side brush assembly.
5. Place the new side brush underneath the side
brush assembly and lift the side brush up onto
the side brush hub until the brush locks onto
the hub.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 17 of 30)

FaST SYSTEM
REPLACING THE FaST--PAK CARTON
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
1. Open the side access door.
2. Slide the seat completely forward.

3. Squeeze the button on the FaST supply hose
connector, then pull the empty FaST--PAK
carton out from the compartment and discard.

4. Remove the perforated knock outs from the
new FaST--PAK carton. Do Not remove the
bag from the carton. Pull out the hose
connector located on the bottom of the bag
and remove the hose cap from the connector.
NOTE: The FaST--PAK Floor Cleaning
Concentrate is specially designed for use with the
FaST system scrubbing application. NEVER use
a substitute. Other cleaning solutions may cause
FaST system failure.
5. Slide the FaST--PAK carton into the
FaST--PAK bracket.
6. Connect the FaST supply hose to the
FaST--PAK hose connector.
7. Scrub with the FaST system for a few
minutes to allow the detergent to reach
maximum foaming.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 18 of 30)

CLEANING THE FaST SUPPLY HOSE
CONNECTOR

CLEANING THE FaST SYSTEM AIR PUMP
FILTER

Soak the connector in warm water if detergent
buildup is visible. When a FaST--PAK carton is not
installed, store the supply hose connector on the
storing plug to prevent the hose from clogging.

Remove and clean the air filter with compressed
air after every 200 hours of FaST scrubbing.
FOR SAFETY: When servicing machine, wear
eye protection when using pressurized air or
water.

M
CLEANING THE FaST SYSTEM FILTER
SCREEN
The FaST system filter screen filters water from
the solution tank as the water flows into the FaST
system.
Remove the filter screen bowl and clean the filter
screen after every 50 hours of operation. Empty
the solution tank before removing the filter.

M20 331385 (02-2007)

M20 Maintenance Information
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SQUEEGEE BLADES

6. Loosen the rear retaining band tension latch
and open the retaining band.

Check the squeegee blades for damage and wear
daily. When the blades become worn, rotate the
blades end--for--end or top--to--bottom to a new
wiping edge. Replace blades when all edges are
worn.

Check the deflection of the squeegee blades daily
or when scrubbing a different type of surface.
Check the leveling of the rear squeegee every
100 hours of operation.
REPLACING (OR ROTATING) THE REAR
SQUEEGEE BLADES
1. Lower the scrub head.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Disconnect the vacuum hose from the rear
squeegee assembly.

7. Remove the rear squeegee.

3. Remove both mounting knobs from the rear
squeegee assembly.
4. Turn on the machine, raise the scrub head,
and turn off the machine.
5. Remove the rear squeegee assembly from
the machine.

M20 331385 (02-2007)

M20 Maintenance Information
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8. Install the new rear squeegee blade or rotate
the existing blade to the new edge. Be sure all
the holes in the squeegee blade are hooked
onto the tabs.

11. Loosen the front retaining band tension latch
and open the retaining band.

M
12. Remove the front squeegee.
9. Reinstall the rear retaining band aligning the
tabs with the holes.

10. Tighten the rear retaining band tension latch.

M20 331385 (02-2007)

13. Install the new front squeegee blade or rotate
the existing blade to the new edge. Be sure
the holes in the squeegee blade are hooked
onto the tabs.

M20 Maintenance Information
(Page 21 of 30)

14. Reinstall the front retaining band aligning the
tabs with the notches.

REPLACING OR ROTATING THE SIDE
SQUEEGEE BLADES
1. If necessary, raise the scrub head.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Open the outer brush doors.
3. Unhook the latch on the side squeegee
retaining band from the side squeegee
assembly.

M
15. Tighten the front retaining band tension latch.
16. Reinstall the rear squeegee assembly onto
the machine.
17. Check and adjust the rear squeegee if
necessary. Refer to ADJUSTING THE REAR
SQUEEGEE BLADE DEFLECTION and
LEVELING THE REAR SQUEEGEE sections
of this manual.

4. Remove the retaining band from the side
squeegee assembly.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 22 of 30)

5. Remove the side squeegee blade. If the outer
edge of the squeegee blade is not worn,
rotate the squeegee blade with the blade from
the other side of the machine. Discard the
squeegee blade if both edges are worn.

8. Hook the latch on the side squeegee retaining
band.

M
9. Close the outer brush door.
6. Install the new or rotated squeegee blades.

REPLACING THE SIDE BRUSH SQUEEGEE
BLADE (OPTION)
Check the side brush squeegee blade for damage
and wear daily. Replace the blade if the leading
edge is torn or worn half-way through the
thickness of the blade.
1. If necessary, raise the scrub head.
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Pull the pin from the squeegee bumper and
open the squeegee bumper.

7. Reattach the side squeegee retaining band to
the side squeegee assembly.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 23 of 30)

3. Remove the clevis pin and squeegee retainer.

LEVELING THE REAR SQUEEGEE
Leveling the squeegee assures the entire length
of the squeegee blade is in even contact with the
surface being scrubbed. Perform this adjustment
on an even and level floor.
1. Lower the squeegee and drive the machine
forward a few meters (feet).
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.

2. Look at the deflection of the squeegee over
the full length of the squeegee blade.
4. Pull the squeegee out from the side brush
assembly.

3. If the deflection is not the same over the full
length of the blade, turn the squeegee
levelling nut to make adjustments.
DO NOT disconnect the suction hose from
the squeegee frame when leveling squeegee.

5. Slide the new squeegee into the side brush
assembly.
6. Reinstall the squeegee retainer and clevis pin.
7. Close the squeegee bumper and reinsert the
pin.

4. Turn the squeegee leveling nut
counter-clockwise to decrease the deflection
at the ends of the squeegee blade.
Turn the squeegee leveling nut clockwise to
increase the deflection at the ends of the
squeegee blade.
5. Drive the machine forward with the squeegee
down to recheck the squeegee blade
deflection if adjustments were made.
6. Readjust the squeegee blade deflection if
necessary.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 24 of 30)

ADJUSTING THE REAR SQUEEGEE BLADE
DEFLECTION
Deflection is the amount of curl the overall
squeegee blade has when the machine moves
forward. The best deflection is when the
squeegee wipes the floor dry with a minimal
amount of deflection.

3. To adjust the overall squeegee blade
deflection, turn the adjustment knobs
counterclockwise to increase deflection or
clockwise to decrease deflection.

NOTE: Make sure the squeegee is level before
adjusting the deflection. See LEVELING THE
REAR SQUEEGEE.
1. Lower the squeegee and drive the machine
forward a few meters (feet).

FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
2. Look at the amount of deflection or “curl” of
the squeegee blade. The correct amount of
deflection is 12 mm (0.50 in) for scrubbing
smooth floors and 15 mm (0.62 in) for rough
floors.

4. Drive the machine forward again to recheck
the squeegee blade deflection after
adjustments are made.
5. Readjust the squeegee blade deflection if
necessary.

12 mm
(0.50 in)

M20 331385 (02-2007)

M20 Maintenance Information
(Page 25 of 30)

SOLUTION TANK SEALS
SKIRTS AND SEALS

Check each solution tank cover seal for damage
and wear daily.

SCRUB HEAD SKIRT
Check the skirt for damage and wear after every
100 hours of operation.

M
The skirts should be between 0 to 6 mm
(0 to 0.25 in) from the floor when the scrub head
is down.
RECOVERY TANK SEAL
Check the recovery tank cover seal for damage
and wear daily.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 26 of 30)

BRAKES AND TIRES

PROPELLING MOTOR

BRAKES

Torque the shaft nut to 508 Nm (375 ft lb)
lubricated, 644 Nm (475 ft lb) dry, after every 800
hours of operation.

The mechanical brakes are located on the rear
wheels. The brakes are operated by the foot
brake pedal and connecting cables.
Check the brake adjustment after every 200 hours
of operation.
PARKING BRAKE
The parking brake is set with the parking brake
pedal that activates the brakes.

Check the parking brake adjustment after every
200 hours of operation.
TIRES
Check tires for damage and wear after every 100
hours of operation.
FRONT WHEEL
Torque the front wheel nuts twice in the pattern
shown to 122 to 149 Nm (90 to 110 ft lb) after the
first 50 hours of operation, and after every 800
hours there after.

1
3

M20 331385 (02-2007)

M20 Maintenance Information
(Page 27 of 30)

TRANSPORTING THE MACHINE
PUSHING, TOWING, AND TRANSPORTING
THE MACHINE
PUSHING OR TOWING THE MACHINE
If the machine becomes disabled, it can be
pushed from the front or rear, but only towed from
the front.

The propelling pump has a bypass valve to
prevent damage to the hydraulic system when the
machine is being pushed or towed. This valve
allows a disabled machine to be moved for a very
short distance and at a speed to not exceed 1.6
kp/h (1 mph). The machine is NOT intended to be
pushed or towed a long distance or at a high
speed.

1. Raise the squeegee, scrub head, and
brushes. If necessary, raise the hopper for
additional ramp clearance.
NOTE: Empty the hopper, the recovery tank, and
the solution tank before transporting.
2. Position the rear of the machine at the loading
edge of the truck or trailer.
3. If the loading surface is not horizontal or is
higher than 380 mm (15 in) from the ground,
use a winch to load machine.
If the loading surface is horizontal and 380
mm (15 in) or less from the ground, the
machine may be driven onto the truck or
trailer.

ATTENTION! Do not push or tow machine for
a long distance or damage may occur to the
propelling system.
Turn the bypass valve located on the bottom of
the propelling pump 90_ (either direction) from the
normal position before pushing or towing the
machine. Return the bypass valve back to the
normal position when through pushing or towing
the machine. Do Not use the bypass valve during
normal machine operation.

FOR SAFETY: When loading machine onto
truck or trailer, use winch. Do not drive the
machine onto the truck or trailer unless the
loading surface is horizontal AND is 380 mm
(15 in) or less from the ground.
4. To winch the machine onto the truck or trailer,
attach the winching chains to the holes in the
rear jacking brackets behind the rear tires.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 28 of 30)

5. Position the machine as close to the front of
the trailer or truck as possible.
6. Set the parking brake and place a block
behind each wheel to prevent the machine
from rolling.

9. Route the tie--downs to the opposite ends of
the machine and hook them to the brackets
on the floor of the trailer or truck. Tighten the
tie--down straps.
NOTE: It may be necessary to install tie-down
brackets to the floor of the trailer or truck.

7. Lower the scrub head.
8. Connect the tie--down straps to the holes in
the right and left lower corners in front of the
machine and the holes in the rear jacking
brackets behind the rear tires.

M
10. If the loading surface is not horizontal or is
higher than 380 mm (15 in) from the ground,
use a winch to unload machine.
If the loading surface is horizontal AND is 380
mm (15 in) or less from the ground, the
machine may be driven off the truck or trailer.
FOR SAFETY: When unloading machine off
truck or trailer, use winch. Do not drive the
machine off the truck or trailer unless the
loading surface is horizontal AND 380 mm
(15 in) or less from the ground.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 29 of 30)

MACHINE JACKING

STORAGE INFORMATION

Empty the hopper, recovery tank, and solution
tank before jacking up the machine. Jack up the
machine at the designated locations. Use a hoist
or jack capable of supporting the weight of the
machine. Use jackstands to support the machine.
Always stop the machine on a flat, level surface
and block the tires before jacking up the machine.

The following steps should be taken prior to
storing the machine for extended periods.

Rear jacking locations are located directly behind
the rear tires on each side of the machine.

1. Drain and clean the solution and recovery
tanks. Open the recovery tank and solution
tank covers to allow the air to circulate.
2. Park the machine in a cool, dry area. Do not
expose the machine to rain. Store indoors.
3. Remove the battery, or charge battery every
three months.
FREEZE PROTECTION
FOR SAFETY: Before leaving or servicing
machine, stop on level surface, set parking
brake, and turn off machine.
1. Be sure the solution tank and recovery tank
are empty.
2. Pour 3.8 L (1 gal) of premixed automotive
windshield washer solution into the solution
tank.

Front jacking locations are located on the frame
directly in front of the front tire.

3. Turn the key to the on position (without
starting the machine).
4. Press the 1--STEP Scrub button.
5. Repeatedly press the Solution increase button
(+) until the solution flow is at the highest
setting.
6. Press the directional pedal to circulate the
windshield washer solution completely
through the system.
7. Press the 1--STEP Scrub button again to turn
off the system and turn the key to the off
position.

FOR SAFETY: Before leaving or servicing
machine, stop on level surface.
FOR SAFETY: When servicing machine, block
machine tires before jacking machine up. Use
a hoist or jack that will support the weight of
the machine. Jack machine up at designated
locations only. Support machine with jack
stands.

8. The remaining washer solution does not need
to be drained from the solution tank.
NOTE: Storing or transporting machines equipped
with the ES or the FaST system in freezing
temperatures requires special procedures.
Consult a TENNANT representative for more
information.

M20 331385 (02-2007)

M20 Maintenance Information
(Page 30 of 30)

Solution & Recovery Tanks Pinch Valve Adjustments

Procedure to adjust Solution & Recovery Tank pinch valves:
1)
2)
3)
4)
5)
6)
7)
8)

Place a 1/4” or 6 mm hex key wrench or drill bit approximately 1” (25 mm) from the LEVER side of
the pinch valve bracket. Secure with tape.
Place a 5/32” or 4 mm hex key wrench or drill bit approximately 1” (25 mm) from the NON-LEVER
side of the pinch valve bracket. Secure with tape.
Loosen bolts “A” and “B”.
Apply downward pressure to Pinch Arm.
Turn cam “C” on Pinch Valve Lever until contact is made with the 1/4” or 6 mm hex key wrench or
drill bit.
While keeping downward pressure on the Pinch Arm, ensure that contact is made with the 5/32” or 4
mm hex key wrench or drill bit on the NON-LEVER side.
Tighten bolts “A” & “B”.
Verify proper clearances have been attained. Repeat procedure if needed.

1” (25 mm)
from side

1/4” or 6 mm
hex key wrench
or drill bit

Pinch Valve
Lever

5/32” or 4 mm
hex key wrench
or drill bit

Pinch Arm

1” (25 mm)
from side

Pinch Arm

Bolt “A”
Bolt “B”

Pinch Valve
Lever

Cam “C”
M20 331385 (02-2007)

M20 331385 (02-2007)

M20
ELECTRICAL
Troubleshooting Information
BEFORE CONDUCTING TESTS:

* Read and Follow ALL Safety Warnings and Precautions as
mentioned at the beginning of this manual
* Always use an ESD (Electrostatic Discharge) strap when working
near the Control Board
* Be cautious when working near Control Board – Battery voltage is
always present, even with Key OFF
* Always unhook Battery when removing or replacing components

DURING TESTS:
* Call Technical Services if Diagnostic Time Exceeds One Hour With
Unknown Cause or Course of Action

NOTE: Troubleshooting charts may be shown with optional equipment.
The optional equipment may not be specified in these charts. Some machines
may not be equipped with all components shown.

M20 331385 (02-2007)

M20 Electrical Schematic
(Page 1 of 7)

E
2

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
56

M20 331385 (02-2007)

M20 Electrical Schematic
(Page 2 of 7)

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Schematic
(Page 3 of 7)

4
5

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
58

M20 331385 (02-2007)

M20 Electrical Schematic
(Page 4 of 7)

4
5

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Schematic (Gas/LPG only)
(Page 5 of 7)

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
60

M20 331385 (02-2007)

M20 Electrical Schematic (Gas/LPG only)
(Page 6 of 7)

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
1018547

M20 331385 (02-2007)

M20 Electrical Schematic (Diesel only)
(Page 7 of 7)

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
62

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 1 of 14)

Main Wire Harness

E
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 2 of 14)

Main Wire Harness

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
64

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 3 of 14)

Main Wire Harness

E
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 4 of 14)

Main Wire Harness

E
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 5 of 14)

Main Wire Harness

E
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 6 of 14)

Main Wire Harness

E
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
68

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 7 of 14)

Main Wire Harness

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 8 of 14)

Headlight Wire Harness

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 9 of 14)

Hopper Wire Harness

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 10 of 14)

Hopper Cover Wire Harness

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
72

M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 11 of 14)

5
8

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 12 of 14)

1018547

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 13 of 14)

7
8
9
6

GAS INJECTOR AUX. HARNESS

L.P. DUAL SOL. AUX. HAENESS
13

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

M20 Electrical Wiring Harness Detail
(Page 14 of 14)

354389

o
Y
Y
Y
Y
Y
Y

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

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Harness, Main [M20]
Harness, Headlight [M20 And T20]
Harness, Hppr [M20]
Harness, Hppr, Cover [M20]
Harness, Eng [1.6l, Gm, E--cntrl]
Relay, 12vdc, 20a, Spdt
Relay, 12vdc, 40a, Spdt
Fuse, 5 Amp, [Min--5]
Fuse, 20 Amp, [Min--20]
Fuse, 15 Amp, [Min--15]
Fuse, 50amp
Harness, Injector, Gas [1.6l,Gm,E--cntrl]
Harness, Injector, Lpg [1.6l,Gm,E--cntrl]

Qty.
1
1
1
1
1
1
2
1
1
2
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
76

M20 331385 (02-2007)

M20 Wiring Harness Detail
(Page 15 of 15)

Fast Wire Harness Group

E
1019646

Ref.
1

Serial Number
(000000--

)

Description
Harness [Fast, M20 And T20]

Qty.
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

Commonly Used Electrical Symbols & Terms
NOTE: The term “NORMALLY” refers to the component’s “at rest” or “de-energized” position

+
Wires Connected
Together

Plug-in
Connection

Wires Not
Connected
Together

OFF

Normally Open
Switch

Battery

Relay Coil with spike
suppression resistor

Open

Closed

Horn or
Diode
Sensor
Alarm (Variable Resistor)

Component in Position
Other than Normal

LED

Information Battery Positive
Box
or Positive Output

Fuse

Motor

Relay Contacts

Normally Open
Momentary Switch

M2A

Normally Open
Normally Open
Liquid Level Switch Pressure Switch

Lamp
(Light Bulb)

Normally Open
Temperature Switch

Solenoid
Valve

Information

Warning! Component
is Energized

Connection TO or
Battery Negative
or Logic Ground FROM Another Point

Movement from
Normal Position

Assembly

PIN P2-11

PIN P2-35

Control
Board Output

Control
Board Input

Terms & Abbreviations
ECM – Engine Control Module
LED – Light Emitting Diode
MIL – Malfunction Indicator Lamp
PWM – Pulse Width Modulation (A method of using controlled on/off times to regulate the voltage and current
supplied to an electrical device)
SV – Solenoid Valve
SW – Switch

Example of Wiring Numbers & Colors:
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

0
1

Color of Wire

Tan
Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

1 RED

13 BLK

M20 331385 (02-2007)

M20 Touch Panel Detail

E
A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.
N.
O.
P.

M20 331385 (02-2007)

Fault indicator light
Hour meter / fuel indicator / fault code indicator
1-STEP sweep button
1-STEP scrub button
Scrub vacuum fan / squeegee button
ES (Extended Scrub) button (option)
FaST button (option)
Solution & detergent increase button (+)
Solution & detergent decrease button (-)
Brush pressure increase button (+)
Brush pressure decrease button (-)
Filter shaker button
Sweep vacuum fan button
Side brush button
Engine speed button
Supervisor control buttons

M20 Touch Panel LED’s Detail

B
E

A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.

Low Engine Speed Indicator
High Engine Speed Indicator
Fault/Condition Indicator
Side Brush ON Indicator
Filter Shaker ON Indicator
Sweeping Vacuum Fan ON Indicator
1-STEP Sweep ON Indicator
FaST System ON Indicator
Scrubbing Vacuum Fan ON & Squeegee System ON Indicator
1-STEP Scrub ON Indicator
Brush Pressure Indicators (1 LED=Low, 2 LED’s=Medium, 3 LED’s=High)
Solution Volume Indicators (1 LED=Low, 2 LED’s=Medium, 3 LED’s=High)
ES (Extended Scrub) System ON Indicator

M20 331385 (02-2007)

M20 Option Components
The following chart lists various options and the electrical and/or hydraulic components
that are associated with the option. Refer to the “notes” section for any components that
are deleted from a standard machine in order to have the installed option.

(Extended Scrub)

Spray
Hose

Side Brush

option

added components

E or H component #

Side Brush ON Solenoid Valve

E,H

SV-8

Side Brush Pressure Solenoid Valve

E,H

SV-10

Side Brush Down Solenoid Valve

E,H

SV-11

Side Brush Extend Solenoid Valve

E,H

SV-12

FaST Side Brush Valve

SOL-6

Side Brush Water Valve

SOL-7

Side Brush Manifold

Side Brush Lift Cylinder

Side Brush Extend Cylinder

Side Brush Motor

Solution Tank Auto Fill Water Valve

SOL-1

Recovery Tank Auto Fill Water Valve

SOL-2

Solution Tank Full Switch

S-14

Recovery Tank Half Full Switch

S-16

Detergent Pump

ES Pump

Spray Hose Pump

Spray Hose Relay

M12

Spray Hose Switch

S-25

notes

E
If machine has ES option, the following
components will not be on the
machine: FaST Water Pump, FaST
Water Pump Relay (M11), FaST
Detergent Pump, FaST Air Pump,
FaST Enable Valve (SOL-4), FaST
High Flow Valve (SOL-5), FaST Side
Brush Valve (SOL-6)

E = Electrical Component
H = Hydraulic Component

M20 331385 (02-2007)

M20 Key Switch
30
30
50
50
17
17
19
19
ACC
ACC

GLOW PLUG POSITION
(Diesel Only)
Spring loaded- Returns
to "OFF" unless held

OFF

OFF
RUN

Glow
Plug

START
KEY SWITCH

OFF

RUN

Glow
Plug

OFF POSITION

START
KEY SWITCH

OFF

RUN

Glow
Plug

START

Glow
Plug

RUN
START

KEY SWITCH

ACC

RUN POSITION

START POSITION
Spring loaded-Returns to “RUN" unless held
SWITCH TERMINAL MARKING

KEY SWITCH POSITION

ACC

GLOW PLUG
OFF

NO CONNECTIONS

RUN
START

“.

“ Indicates a common connection

NOTE: Common connections in various switch positions should be less than 1ȍ

M20 331385 (02-2007)

M20 Key OFF Power Distribution
Conditions: Key off
12 VDC

1/RED

13/BLK

ALTERNATOR
1/RED

GREEN JUMPER WIRE

1/RED
Touch Panel / Control Board

13/BLK

PIN P2-33

13/BLK

PIN P2-34

13/BLK

PIN P2-35

KEY SWITCH

OFF
PIN P1-23

FUSE 10

1/RED

105

STATIC
GROUND

PIN P2-3
15 AMP

!
i

Be cautious when working near Control Board Battery voltage is always present, even with Key OFF

Pin P2-3 supplies power to the on-board clock only.
Disconnecting battery, removing Fuse 10, or removing connector
P2 from Control Board will require the clock to be reset.

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

M20 Key ON Power Distribution
Conditions: Key on, engine off
12 VDC

1/RED

13/BLK

ALTERNATOR
1/RED

GREEN JUMPER WIRE

1/RED

ALTERNATOR
LAMP

M1A

13/BLK

15 AMP

KEY SWITCH

RUN

4 TO FUSES
9 &12

1/RED

FUSE 1 8

Touch Panel /
Control Board

AUX. 1
RELAY
30

1/RED

13/BLK
87

PIN P2-33

FUSE 5

PIN P2-1
PIN P2-34

15 AMP
14

M1B
1/RED

D-2

SHUTDOWN RELAY
CONTACTS
(Normally CLOSED)
8

M2A

TO FUSE
6

PIN P2-2
PIN P2-35
PIN P1-23

13/BLK

105

STATIC
GROUND
13/BLK

13/BLK

M6C
3

AUX. 2
RELAY

TO ENGINE
HARNESS

M2B
1/RED 30

1/RED

TO FUSES
7&8

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

M20 Main Brushes ON
Conditions: Key on, engine running, scrubbing or sweeping system on, propel forward or reverse

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

Component

Max Amp Draw

SV-3

1.7 A

SV-6

1.7 A

SV-7

1.7 A

ENABLE VALVE

Touch Panel / Control Board

PIN P2-8
15 AMP

SV-7

FUSE 5

PWM

BRUSH HEAD
PRESSURE

PIN P2-4

15 AMP
Typical Default
Amp Draw Readings (+/- 10%)
(SWEEPING)

SV-2
14

MAIN BRUSHES
LOWER

Setting SV-2 Amp Draw

180 mA

255 mA

290 mA

SV-3
MAIN BRUSHES
ROTATE 58

SV-6

Setting SV-2 Amp Draw

285 mA

395 mA

490 mA

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

PIN P2-5

Typical Default
Amp Draw Readings (+/- 10%)
(SCRUBBING)
P1

Pressure settings P1, P2, & P3 are
the Touch Panel LED indicators
for Brush down pressure

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

SV-2 is controlled by PWM; A higher duty cycle
(more Brush Pressure LED’s lit on Touch
Panel) will result in more brush down pressure

M20 Scrub Vacuum Fan ON & Squeegees DOWN
Conditions: Key on, engine running, scrubbing system & scrub vacuum on, propel forward

Component

Max Amp Draw

SV-1

1.7 A

SV-4

1.7 A

SV-7

1.7 A

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

Touch Panel / Control Board

FUSE 6

ENABLE
VALVE

PIN P2-8
15 AMP

FUSE 5

SV-7
SCRUB
VACUUM
FAN ON 56

15 AMP

PIN P2-28

SV-1
14

SIDE & REAR
SQUEEGEES
LOWER 59

PIN P2-6

SV-4

Reverse propel will turn OFF SV-4 (Pin P2-6)
and raise the side and rear squeegees.

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

Any condition that cancels the scrub functions will also
turn OFF the scrub vacuum fan and raise squeegees.

M20 331385 (02-2007)

M20 Hopper LIFT
Conditions: Key on, engine running, hopper lift switch activated
Component

Max Amp Draw

SV-7

1.7 A

SV-9

1.7 A

SV-13

1.7 A

SV-14

1.7 A

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

ENABLE
VALVE

BATTERY
NEGATIVE

Touch Panel / Control Board

HOPPER DOWN
SENSE SWITCH

PIN P2-8
15 AMP

SV-7

13/BLK

PIN P1-3
6

FUSE 5

HOPPER
LIFT

15 AMP

S-6
60

OPEN = UP
CLOSED = DOWN

PIN P2-7

SV-14

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

HOPPER
LIFT/LOWER
SWITCH

PIN P1-7
FUSE 7

HOPPER
LATCH

138

2
PIN P2-32
PIN P1-8

HOPPER
LOWER

13/BLK

SOL-9
FUSE 8

OFF

15 AMP

PIN P2-31

S-5

1&2 CLOSED = LIFT
2&4 CLOSED = LOWER

15 AMP

SV-13

i
i

If hopper is in the fully DOWN position when activating
Hopper Lift, the Hopper Lower Valve (SV-13) is
momentarily turned ON to help “jog” the hopper latch
Activating the Hopper Lift/Lower Switch will
cancel the sweep or scrub systems and
automatically selects HIGH engine speed

i
i

Hopper Latch solenoid (SOL-9)
is an electro-mechanical device

Hopper Latch solenoid (SOL-9) turns
ON for 3 to 5 seconds with each
activation of Hopper Lift Switch

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

0
1

Color of Wire

Tan
Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

HOP
SEN PER D
O
SE
SW WN
ITC
H

PP
SO ER LA
LEN TC
OID H

PU
TO SH
L IF
T

/
FT
LI TCH
I
ER W
PP R S
H O WE
LO

M20 Hopper LOWER
Conditions: Key on, engine running, hopper lower switch activated

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

Component

Max Amp Draw

SV-7

1.7 A

SV-9

1.7 A

SV-13

1.7 A

SV-14

1.7 A
ENABLE
VALVE

BATTERY
NEGATIVE
Touch Panel / Control Board

HOPPER DOWN
SENSE SWITCH
61

PIN P2-8
15 AMP

SV-7
PIN P1-3
6

FUSE 5

HOPPER
LIFT

13/BLK

S-6
60

OPEN = UP
CLOSED = DOWN

PIN P2-7

15 AMP

SV-14

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

PIN P1-7
FUSE 7

HOPPER
LATCH

138

HOPPER
LIFT/LOWER
SWITCH

2
OFF

PIN P2-32

13/BLK

15 AMP

SOL-9
5

FUSE 8

PIN P1-8
HOPPER
LOWER

1
53

S-5

PIN P2-31
1&2 CLOSED = LIFT
2&4 CLOSED = LOWER

15 AMP

SV-13

Activating the Hopper Lift/Lower Switch will
cancel the sweep or scrub systems and
automatically selects HIGH engine speed

Hopper Latch solenoid (SOL-9)
is an electro-mechanical device

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

/
FT
LI TCH
I
ER W
PP R S
H O WE
LO

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

HOP
SEN PER D
O
SE
SW WN
ITC
H

PP
SO ER LA
LEN TC
OID H

H
PUS ER
OW
L
TO

M20 331385 (02-2007)

M20 Side Brush ON
Conditions: Key on, engine running, scrubbing or sweeping system on, side brush on, propel forward or reverse

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

Component

Max Amp Draw

SV-7

1.7 A

SV-8

1.7 A

SV-11

1.7 A

SV-12

1.7 A

Touch Panel / Control Board

ENABLE VALVE

PIN P2-8
15 AMP

SV-7
15

PWM

Typical Default
Amp Draw Readings (+/- 10%)
(SCRUBBING)
Setting SV-10 Amp Draw

530 mA

625 mA

715 mA

Typical Default
Amp Draw Readings (+/- 10%)
(SWEEPING)
500 mA

540 mA

615 mA

PIN P2-11

SV-10

SIDE
BRUSH DOWN

PIN P2-12

SV-11
15

SIDE
BRUSH EXTEND

Setting SV-10 Amp Draw

SIDE
BRUSH
PRESSURE

PIN P2-9

SV-12
15

SIDE
BRUSH RUN

SV-8

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

Pressure settings P1, P2, & P3 are
the Touch Panel LED indicators
for Brush down pressure

SV-10 is controlled by PWM; A higher duty cycle
(more Brush Pressure LED’s lit on Touch
Panel) will result in more brush down pressure

M20 Sweep Vacuum Fan ON
Conditions: Key on, engine running, sweeping system and/or sweep vacuum fan on
BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

Component

Max Amp Draw

M3A

200 mA

SV-9

1.7 A

BATTERY
NEGATIVE

Touch Panel / Control Board

SWEEP
VACUUM
FAN RUN

HOPPER
THERMAL
SENTRY
SWITCH13/BLK

PIN P1-5

PIN P2-10
15 AMP

S-9

SV-9

OPEN = BELOW 140°F
CLOSED = ABOVE 140°F

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

PIN P1-16
5

FUSE 7

M3A

PIN P2-16

S-18

15 AMP

OPEN = FILTER OK
CLOSED = FILTER CLOGGED

UNSWITCHED
BATTERY
POSITIVE

BATTERY
NEGATIVE

SHAKER
RELAY

1/RED FUSE 2

SHAKER
MOTOR

M3B
122

13/BLK

15 AMP

If the shaker system is manually selected when
Sweep Vacuum Fan is ON, the fan is turned
OFF during the shaker cycle, and turned back
ON when shaker cycle is complete

SWEEP FILTER
CLOGGED
SWITCH 13/BLK

STATIC GROUND

If Sweep Filter Clogged Switch closes
(restriction in filter), a fault condition will
be displayed, but vacuum fan will
continue operating normally.

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

If the Hopper Thermal
Sentry Switch closes (above
140°F in hopper), all sweep
functions are cancelled.

Color of Wire

HOPPER TH
ERMAL
SENTRY SW
ITCH

i
SW
CLO EEP
(BE GGED FILTE
R
HIN
D B SWITC
UM
P ER H
)

A short shaker cycle is
automatically performed
each time the Sweep
Vacuum is turned OFF

M20 331385 (02-2007)

M20 Shaker Motor ON
Conditions: Key on, One-Step sweeping turned off or shaker system on
BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

FUSE 6

Component

Max Amp Draw

M3A

200 mA

SV-9

1.7 A

BATTERY
NEGATIVE

Touch Panel / Control Board

SWEEP
VACUUM
FAN RUN

HOPPER
THERMAL
SENTRY
SWITCH13/BLK

PIN P1-5

PIN P2-10
15 AMP

S-9

SV-9

OPEN = BELOW 140°F
CLOSED = ABOVE 140°F

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

PIN P1-16
5

FUSE 7

M3A

PIN P2-16

OPEN = FILTER OK
CLOSED = FILTER CLOGGED

SHAKER
RELAY

UNSWITCHED
BATTERY
POSITIVE

BATTERY
NEGATIVE

SHAKER
MOTOR

M3B
1/RED FUSE 2

S-18

15 AMP

122

13/BLK

15 AMP

If the shaker system is manually selected when
Sweep Vacuum Fan is ON, the fan is turned
OFF during the shaker cycle, and turned back
ON when shaker cycle is complete

SWEEP FILTER
CLOGGED
SWITCH 13/BLK

STATIC GROUND

If Sweep Filter Clogged Switch closes
(restriction in filter), a fault condition will
be displayed, but vacuum fan will
continue operating normally.

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

If the Hopper Thermal
Sentry Switch closes (above
140°F in hopper), all sweep
functions are cancelled.

Color of Wire

HOPPER TH
ERMAL
SENTRY SW
ITCH

i
SW
CLO EEP
(BE GGED FILTE
R
HIN
D B SWITC
UM
P ER H
)

A short shaker cycle is
automatically performed
each time the Sweep
Vacuum is turned OFF

M20 Float Switches
BATTERY
NEGATIVE
Touch Panel / Control Board

SOLUTION TANK
EMPTY SWITCH

PIN P1-11

13/BLK

177

S-19
OPEN = EMPTY
CLOSED = NOT EMPTY

SOLUTION TANK
FULL SWITCH

PIN P1-12

13/BLK

S-14
OPEN = NOT FULL
CLOSED = FULL

RECOVERY TANK
FULL SWITCH

PIN P1-13

13/BLK

S-15
OPEN = NOT FULL
CLOSED = FULL

RECOVERY TANK
HALF FULL SWITCH

PIN P1-14

13/BLK

S-16
OPEN = LESS THAN HALF FULL
CLOSED = HALF FULL OR MORE

The Float Switches must be closed for
5 seconds before any output is affected

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

N TA N K
SOLUTIO
ITCH
W
S
L
FUL

SO
EM LUTI
PT ON
Y S TA
WI N K
TC
H

NK
TA
RY CH
E
T
V
WI
CO
RE ULL S
F

R
H A E CO
LF V E
FU RY
LL
T
S W A NK
ITC
H

M20 331385 (02-2007)

M20 Auto Fill Solenoids
Conditions: Key on

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

Component

Max Amp Draw

SOL-1

1.7 A

SOL-2

1.7 A

BATTERY
NEGATIVE

Touch Panel / Control Board

SOLUTION TANK
EMPTY SWITCH

FUSE 7

SOLUTION
TANK AUTO
FILL VALVE

PIN P1-11

13/BLK

177

S-19
65

PIN P2-13

OPEN = EMPTY
CLOSED = NOT EMPTY

15 AMP

SOL-1

SOLUTION TANK
FULL SWITCH
16

PIN P1-12
RECOVERY
TANK AUTO
FILL VALVE

S-14
67

RECOVERY TANK
FULL SWITCH

PIN P1-13

13/BLK

Solution and Recovery Tank Auto
Fill solenoids (SOL-1 & SOL-2) are
electro-mechanical devices

Machine must be in neutral and Solution Tank
Full Switch OPEN (tank not full) to activate
Solution Tank Auto Fill Valve (SOL-1)

OPEN = NOT FULL
CLOSED = FULL

PIN P2-14

SOL-2

13/BLK

S-15
OPEN = NOT FULL
CLOSED = FULL

RECOVERY TANK
HALF FULL SWITCH

PIN P1-14

13/BLK

S-16
OPEN = LESS THAN HALF FULL
CLOSED = HALF FULL OR MORE

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

Machine must be in neutral and Recovery Tank
Half Full Switch OPEN (tank less than half full) to
activate Recovery Tank Auto Fill Valve (SOL-2)

The Float Switches must be closed for
5 seconds before any output is affected

M20 Conventional Detergent Pump & ES Pump
Conditions: Key on, engine running, scrubbing system on, ES system on, two or three solution LED’s lit

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

Component

Max Amp Draw

Detergent Pump

1.7 A

ES Pump

n/a

BATTERY
NEGATIVE

Touch Panel / Control Board

SOLUTION TANK
EMPTY SWITCH

PIN P1-11

13/BLK

177

DETERGENT
PUMP
5

FUSE 8

S-19
74

15 AMP

OPEN = EMPTY
CLOSED = NOT EMPTY

PIN P2-21

PWM

SOLUTION TANK
FULL SWITCH

PIN P1-12

13/BLK

S-14
ES
PUMP

OPEN = NOT FULL
CLOSED = FULL

PIN P2-22
RECOVERY TANK
FULL SWITCH

The Recovery Tank must be at least half
full for ES Pump to turn ON. This will
begin a 30 second run cycle of the ES
Pump. If the Recovery Tank is still at
least half full after the cycle, another 30
second cycle will begin. If a full Solution
Tank is sensed, the ES Pump will turn
OFF before completing 30 second cycle.

PIN P1-13

13/BLK

S-15
OPEN = NOT FULL
CLOSED = FULL

RECOVERY TANK
HALF FULL SWITCH

PIN P1-14

13/BLK

S-16

The Float Switches must be closed for
5 seconds before any output is affected

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

OPEN = LESS THAN HALF FULL
CLOSED = HALF FULL OR MORE

The Detergent Pump is controlled by
PWM; A higher duty cycle (more Solution
LED’s lit on Touch Panel) will result in
more detergent & solution applied to floor

Low Water and
Detergent Pump OFF

Medium Water and
Detergent Pump LOW

High Water and
Detergent Pump HIGH
M20 331385 (02-2007)

M20 Hopper Door OPEN
Conditions: Key on, engine running, hopper door open switch activated
BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

Component

Max Amp Draw

SV-7

1.7 A

SV-15

1.7 A

BATTERY
NEGATIVE

Touch Panel / Control Board

FUSE 6

ENABLE
VALVE

PIN P2-8
15 AMP

SV-7

PIN P1-9
BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

HOPPER
DOOR
OPEN/CLOSE
SWITCH

A
OFF

PIN P1-10

13/BLK

B
S-13
FUSE 7

HOPPER
DOOR OPEN 68

PIN P2-15

A&C CLOSED = DOOR OPEN
A&B CLOSED = DOOR CLOSE

15 AMP

SV-15

i
i

Anytime the Enable Valve (SV-7) is ON
and the Hopper Door Open Valve (SV15)
is OFF, the hopper door will close

Activating the Hopper Door Switch to open or close
the door will cancel the sweep or scrub systems
and automatically selects HIGH engine speed

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

H
ER TC
PP WI
HO R S
O
DO

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

H
PUS EN
OP
O
T

M20 Hopper Door CLOSE
Conditions: Key on, engine running, hopper door close switch activated
BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

Component

Max Amp Draw

SV-7

1.7 A

SV-15

1.7 A

BATTERY
NEGATIVE

Touch Panel / Control Board

FUSE 6

ENABLE
VALVE

PIN P2-8
15 AMP

HOPPER
DOOR
OPEN/CLOSE
SWITCH

SV-7

PIN P1-9
BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

C
A
OFF

13/BLK

PIN P1-10

B
S-13
5

FUSE 7

HOPPER
DOOR OPEN 68

A&C CLOSED = DOOR OPEN
A&B CLOSED = DOOR CLOSE

PIN P2-15

15 AMP

SV-15

i
i

Anytime the Enable Valve (SV-7) is ON
and the Hopper Door Open Valve (SV15)
is OFF, the hopper door will close

Activating the Hopper Door Switch to open or close
the door will cancel the sweep or scrub systems
and automatically selects HIGH engine speed

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

H
ER TC
PP WI
O
H RS
O
DO

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

P
TO U S H
CL O
S

M20 331385 (02-2007)

M20 Horn
Conditions: Horn switch activated

UNSWITCHED
BATTERY
POSITIVE

BATTERY
NEGATIVE

HORN
1/RED FUSE 3

13/BLK

15 AMP

M5B

13/BLK

HORN
SWITCH

HORN
RELAY

M5A

13/BLK

S-22
OPEN = HORN OFF
CLOSED = HORN ON

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

RN H
HO ITC
SW

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

M20 Forward Propel
Conditions: Key on, propel pedal pushed for forward travel

BATTERY
NEGATIVE

Touch Panel / Control Board

i
PIN P1-1

Propel Pedal Position Sensor
Arms Adjustment

SENSOR
OUTPUT

PROPEL
PEDAL
POSITION
SENSOR

131/BLK-WHT

DIGITAL
GROUND

SENSOR OUTPUT VOLTAGES:
2.0 to 2.7 VDC = NEUTRAL
2.8 VDC OR HIGHER = REVERSE
1.9 VDC OR LOWER = FORWARD

1) Enter Input Diagnostics Mode
2) Loosen sensor arms hardware
3) Tighten top bolt to snug
4) Slide arm until the light goes ON
5) Back arm out until the light goes OFF
6) Retighten all hardware
NOTE: Use the High Engine Speed LED
to adjust the arm closest to the front of
machine (forward adjustment), and the
Low Engine Speed LED to adjust the arm
closest to the rear of machine (reverse
adjustment).

13/BLK

1
BATTERY POSITIVE
FROM FUSE 5

1.9 VDC OR
LOWER IN
FORWARD

FRONT

TOUCH PANEL
FORWARD
ADJUSTMENT

FRONT
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

REVERSE
ADJUSTMENT

AL
PED
OR
PE L
PRO N SENS
IO
T
I
S
PO

M20 331385 (02-2007)

M20 Reverse Propel
Conditions: Key on, propel pedal pushed for reverse travel

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

Component

Max Amp Draw

M4A

200 mA

BATTERY
NEGATIVE
Touch Panel / Control Board

FUSE 7

M4A

13/BLK

PIN P2-17

15 AMP
2.8 VDC OR
HIGHER IN
REVERSE

i
91

PIN P1-1

REVERSE
RELAY

PROPEL
PEDAL
POSITION
SENSOR

BATTERY POSITIVE
FROM FUSE 5

SENSOR
OUTPUT

131/BLKWHT

DIGITAL
GROUND

SENSOR OUTPUT VOLTAGES:
2.0 to 2.7 VDC = NEUTRAL
2.8 VDC OR HIGHER = REVERSE
1.9 VDC OR LOWER = FORWARD

BATTERY
POSITIVE
FROM
FUSE 1

REVERSE ALARM/
WARNING LIGHT
8

13/BLK

M4B
REVERSE
TAIL LIGHT

Reverse propel will turn OFF
SV-4 (Pin P2-6) and raise the
side and rear squeegees.

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

13/BLK

REVERSE
TAIL LIGHT

13/BLK

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

See Forward Propel page for
information on adjusting
Propel Pedal Position Sensor

AL
PED
OR
PE L
PRO N SENS
IO
T
I
S
PO

M20 Shutdown Relay (Normal Machine Operation)
(Gas/LPG)
12 VDC

1/RED

13/BLK

1/RED
Component

Max Amp Draw

M6A

200 mA
AUXILIARY
RELAY

FUSE 1 8

KEY SWITCH

15 AMP

RUN
4

TO FUSES
9 & 12

AUX. 1 RELAY
CONTACTS

13/BLK

M2A

M1B
6

1/RED

13/BLK

M1A

TO FUSES
5 &6

1/RED

8
PIN
76

CONNECT FOR
L.P.G. ONLY

Refer to the Engine
Controller schematics

J-12

AUXILIARY
RELAY

TAN/BRN

TO ENGINE
ECM

ENGINE HARNESS
CONNECTORS

M2B
AUX. 2 RELAY
CONTACTS

87a

PINK

TO FUSE 2 OF
ENGINE HARNESS

10
PIN

M6C
OPEN = MACHINE
SHUTDOWN
CLOSED = NORMAL
OPERATION

J-11

SHUTDOWN
RELAY
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

100

Color of Wire

FUSE 7

Touch Panel /
Control Board

M6A

PIN P2-18

15 AMP

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

The Shutdown system is used to turn OFF the
engine under certain conditions on machines
with certain optional equipment

When control board turns ON M6A,
the engine ECM loses power, and
engine shuts OFF
M20 331385 (02-2007)

M20 Shutdown Relay (Normal Machine Operation)
(Diesel)
12 VDC

1/RED

13/BLK

1/RED
Component

Max Amp Draw

M6A

200 mA
AUXILIARY
RELAY

FUSE 1 8

KEY SWITCH

15 AMP

RUN
4

TO FUSES
9 & 12

AUX. 1 RELAY
CONTACTS

13/BLK

M2A

M1B
6

1/RED

13/BLK

M1A

TO FUSES
5 &6

AUXILIARY
RELAY
1/RED

M2B
AUX. 2 RELAY
CONTACTS

87a

J-11
3

TO FUEL PUMP
RELAY M10

10
PIN

M6C
OPEN = MACHINE
SHUTDOWN
CLOSED = NORMAL
OPERATION

ENGINE HARNESS
CONNECTOR

SHUTDOWN
RELAY
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

FUSE 7

Touch Panel /
Control Board

M6A

PIN P2-18

15 AMP

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

The Shutdown system is used to turn OFF the
engine under certain conditions on machines
with certain optional equipment

When control board turns ON M6A,
the engine ECM loses power, and
engine shuts OFF
101

M20 Shutdown Relay (Shutdown Mode)
(Gas/LPG)
12 VDC

1/RED

13/BLK

1/RED
Component

Max Amp Draw

M6A

200 mA
AUXILIARY
RELAY

FUSE 1

KEY SWITCH

15 AMP

RUN
4

TO FUSES
9 & 12

AUX. 1 RELAY
CONTACTS

13/BLK

M2A

M1B
6

1/RED

13/BLK

M1A

TO FUSES
5 &6

1/RED

CONNECT FOR
L.P.G. ONLY

Refer to the Engine
Controller schematics

J-12

AUXILIARY
RELAY

8
PIN
76

TAN/BRN

TO ENGINE
ECM

ENGINE HARNESS
CONNECTORS

M2B
AUX. 2 RELAY
CONTACTS

87a

PINK

TO FUSE 1 OF
ENGINE HARNESS

10
PIN

M6C
OPEN = MACHINE
SHUTDOWN
CLOSED = NORMAL
OPERATION

J-11

SHUTDOWN
RELAY
Wiring Color Codes

FUSE 7

(Unless otherwise marked)
Right Most Digit
of Wire Number

102

Color of Wire

Touch Panel /
Control Board

M6A

PIN P2-18

15 AMP

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

The Shutdown system is used to turn OFF the
engine under certain conditions on machines
with certain optional equipment

When control board turns ON M6A,
the engine ECM loses power, and
engine shuts OFF
M20 331385 (02-2007)

M20 Shutdown Relay (Shutdown Mode)
(Diesel)
12 VDC

1/RED

13/BLK

1/RED
Component

Max Amp Draw

M6A

200 mA
AUXILIARY
RELAY

FUSE 1

KEY SWITCH

15 AMP

RUN
4

TO FUSES
9 & 12

AUX. 1 RELAY
CONTACTS

13/BLK

M2A

M1B
6

1/RED

13/BLK

M1A

TO FUSES
5 &6

AUXILIARY
RELAY
1/RED

M2B
AUX. 2 RELAY
CONTACTS

87a

J-11
3

TO FUEL PUMP
RELAY M10

10
PIN

M6C
OPEN = MACHINE
SHUTDOWN
CLOSED = NORMAL
OPERATION

ENGINE HARNESS
CONNECTOR

SHUTDOWN
RELAY
Wiring Color Codes

FUSE 7

(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Touch Panel /
Control Board

M6A

PIN P2-18

15 AMP

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

The Shutdown system is used to turn OFF the
engine under certain conditions on machines
with certain optional equipment

When control board turns ON M6A,
the engine ECM loses power, and
engine shuts OFF
103

M20 Starting System ON
Conditions: Key turned to start position

(Gas/LPG)
12 VDC

1/RED

13/BLK

ENGINE
BLOCK

1/RED
ENGINE
LT.BLUE/PINK
HARNESS
CONNECTOR
30

1/RED

J-11
J

STARTER MOTOR
ASSEMBLY

87a

ENGINE
BLOCK

10
PIN

M7B

87
PINK/BLK
WHITE

STARTER
LOCKOUT
RELAY

STARTER
RELAY

Refer to the Engine
Controller schematics

GRAY/ORANGE

FROM ECM
PIN 9
FROM FUSE 1 OF
ENGINE HARNESS

PINK/TAN
PINK/BLK
2

M7A

J-11

10
PIN

ENGINE HARNESS
CONNECTOR
NO CONNECTION
13/BLK

NO CONNECTION
4

KEY SWITCH

TO FUSES
1, 9, & 12

START
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

104

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

M20 Starting System ON
Conditions: Key turned to start position

(Diesel)
12 VDC

1/RED

13/BLK

ENGINE
BLOCK

1/RED

STARTER MOTOR
ASSEMBLY
1/RED

J-11
77
J

STARTER
RELAY
86

M8A

10
PIN

PIN 2
LOAD

STARTER
RELAY
D-3

M7A

KEY SWITCH

START

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

M9A

13/BLK

TO BATTERY
NEGATIVE

Pink

TO
GLOWPLUGS

Tan

0
1

TO FUSES
1, 9, & 12

Color of Wire

STARTER
LOCKOUT
RELAY

Right Most Digit
of Wire Number

PIN 3
B+

M9B

Wiring Color Codes

PIN 6
INIT

85 13/BLK
55

(Unless otherwise marked)

13/BLK

M9C
87a

PIN 1
GND

STARTER
TIMER
MODULE

M7B

1/RED

ENGINE
BLOCK

M8B

ENGINE
HARNESS
CONNECTOR
1/RED

J-11
SWITCHED BATTERY POSITIVE
FROM SHUTDOWN RELAY M6C

10
PIN

TO FUEL PUMP RELAY
M10 & GOVERNOR

ENGINE HARNESS
CONNECTOR

The Starter Timer Module creates
a delay between start attempts

105

M20 Glow Plugs ON
Conditions: Key turned to start or glow plug position

(Diesel)
GLOW PLUGS
GP1

GP2

GP3

GP4

START
KEY SWITCH

1/RED
TO START
RELAY M7A
42

42
TO FUSES
1, 9, & 12

KEY SWITCH

FROM BATTERY
NEGATIVE

RUN

CH ASS IS GRO UNDS

FROM BATTERY
POSITIVE

OFF
Glow
Plug

13/BLK

GLOW PLUG LAMP

GLOW PLUG

RUN

Glow
Plug

GP2

GP3

GP4

START
KEY SWITCH

1/RED
TO START
RELAY M7A
42

KEY SWITCH

42
TO FUSES
1, 9, & 12

FROM BATTERY
NEGATIVE

GLOW PLUGS
GP1
CH ASS IS GRO UNDS

FROM BATTERY
POSITIVE

OFF

13/BLK

GLOW PLUG LAMP

START
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

106

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

The Glow Plugs are ON only when ignition
switch is in the “Glow Plug” or “Start” position

M20 331385 (02-2007)

M20 Conventional Main & Side Brush Solution Valves
Conditions: Key on, scrubbing system on, side brush on, forward or reverse propel, one or more solution LED’s lit

Component

Max Amp Draw

SOL-3

1.7 A

SOL-7

1.7 A

BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

Touch Panel / Control Board

MAIN BRUSH
SOLUTION VALVE
5

FUSE 7

PIN P2-19
15 AMP

SOL-3
16

181

PIN P2-20

SOL-7
SIDE BRUSH
SOLUTION VALVE

The Solution Valves are pulsed slowly to adjust the solution
volume. Less OFF time (more Solution LED’s lit on Touch
Panel) will result in more solution applied to floor

The Solution Valves will function only while propelling
forward or reverse during scrub operation

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

Low Solution

Medium Solution

High Solution

107

M20 FaST System ON
Conditions: Key on, scrubbing system on, side brush on, forward or reverse propel, one or more solution LED’s lit
BATTERY
POSITIVE
FROM
AUX 2
RELAY
CONTACTS

FaST High Flow Valve is
ON only when all 3
Solution LED’s are lit

i
5

FUSE 8

Touch Panel / Control Board

FaST HIGH
FLOW VALVE

PIN P2-23
15 AMP

SOL-5
Component

Max Amp Draw

SOL-4

1.7 A

SOL-5

1.7 A

SOL-6

1.7 A

M11A

200 mA

FaST Det. Pump

1.7 A

FaST Air Pump

FaST SIDE
BRUSH VALVE

SOL-6
17

1.7 A
17

FaST Water Pressure Switch :
OPEN = Less than 10PSI
CLOSED = More than 10 PSI

FaST
WATER
PRESSURE
SWITCH

FaST DETERGENT
PUMP
83

PWM

FaST
ENABLE
VALVE 75

PIN P2-26

PIN P2-21

PIN P2-22

SOL-4
17

FaST AIR
PUMP

The FaST Detergent Pump
is controlled by PWM;
A higher duty cycle (more
Solution LED’s lit on Touch
Panel) will result in more
FaST foam applied to floor

M11A

75
BATTERY
NEGATIVE

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

108

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

FaST WATER
PUMP RELAY

FaST WATER
PUMP
86

13/BLK

M11B

i
Low FaST

Low FaST

One or two Solution LED’s
lit selects Low FaST output

High FaST
M20 331385 (02-2007)

M20 Fuel Level Sensors
Conditions: Key on

BATTERY
NEGATIVE
Touch Panel / Control Board

GAS /
DIESEL

LPG

FUEL
PRESSURE
SWITCH

13/BLK

S-8

FUEL LEVEL
SENDER 131/BLK-

PIN P1-4

WHT

S-7

DIGITAL
GROUND

13/BLK

PIN P1-4

131/BLKWHT

S-8

DIGITAL
GROUND

100 OHMS = FULL TANK
5 OHMS = EMPTY TANK

NORMALLY CLOSED, HELD
OPEN BY FUEL PRESSURE
OPEN = MORE THAN 70 PSI
CLOSED = 70 PSI OR LOWER

GAS/DIESEL
FUEL
FUEL LEVEL
SENSOR

FUEL TCH
I
LPG
E SW
R
SSU
PRE

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

109

M20 Impact, Hydraulic Temperature, & Hydraulic Filter Sensors
BATTERY
NEGATIVE
Touch Panel / Control Board

HYDRAULIC FILTER
CLOGGED SWITCH

PIN P1-15

13/BLK

S-17
OPEN = LESS THAN 20 PSI (FILTER OK)
CLOSED = MORE THAN 20 PSI (FILTER
CLOGGED)

HYDRAULIC OIL
TEMPERATURE SENSOR

PIN P1-17

131/BLK-WHT

DIGITAL
GROUND

S-20

0.8 VDC OR LESS = 220°F OR HIGHER
ABOVE 0.8 VDC = UNDER 220°F

IMPACT
SENSOR

PIN P1-21

13/BLK

S-23

OPEN = NO IMPACT DETECTED
CLOSED = IMPACT DETECTED

The Hydraulic Filter Clogged Switch will not be
sensed until after the machine has run for 5
minutes to allow the hydraulic oil to warm up

Impact Sensor S-23 is used
only on machines with certain
optional equipment

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

110

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

TE HYD
MP
R
(BA ERA AULI
CK TUR C O
IL
SID
E
E O SEN
F T SO
AN R
K)

R
I L TE
LIC F ITCH
U
A
R
HYD GED SW
G
CLO

M20 331385 (02-2007)

M20 Engine Oil Pressure, Temperature, & MIL Systems
(Gas/LPG)
BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

Engine Oil Pressure
Touch Panel /
Control Board

FUSE 5

8
PIN

15 AMP
LOW ENGINE OIL
PRESSURE LAMP

Refer to the Engine
Controller schematics

J-12

PIN P2-27
9

PIN P1-19

LT.BLUE/WHITE

ENGINE HARNESS
CONNECTOR

OPEN = LOW OIL PRESSURE
BATTERY NEG.= OIL PRESSURE OK

Engine Temperature Switch
Touch Panel /
Control Board

PIN P1-18

BATTERY
NEGATIVE

HIGH ENGINE
TEMPERATURE
SWITCH

OIL PRESSURE
SIGNAL FROM
ECM PIN 30

13/BLK

SW2
OPEN = BELOW 220°F
CLOSED = ABOVE 220°F

J-12
12

8
PIN

TAN/DK.GREEN

TO ECM
PIN 35

Refer to the Engine
Controller schematics

ENGINE HARNESS
CONNECTOR

Wiring Color Codes

Malfunction Indicator Lamp

(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

SWITCHED
BATTERY
POSITIVE
FROM
FUSE 1

0
1

Pink

Brown

Orange

J-11

Yellow

Green

10
PIN

Blue

Purple

Gray

White

M20 331385 (02-2007)

MIL (CHECK
ENGINE LAMP)

Refer to the Engine
Controller schematics
LT.BLUE/BLK

MIL SIGNAL
FROM ECM
PIN 26

ENGINE HARNESS
CONNECTOR

111

M20 Engine Oil Pressure & Temperature Systems
(Diesel)
Engine Oil Pressure Switch
i

This drawing shown with key
switch ON, and engine running

BATTERY
POSITIVE
FROM
AUX 1
RELAY
CONTACTS

TO FUEL PUMP
RELAY M10

BATTERY
NEGATIVE

Touch Panel /
Control Board

6 FUSE 5

J-12

PIN P2-27

15 AMP
LOW ENGINE OIL
PRESSURE LAMP

PIN P1-19

NO CONNECTION

OIL PRESSURE
SWITCH

J-11
E

8
PIN

S-3
5

A
B

ENGINE HARNESS
CONNECTOR

13/BLK

10
PIN
ENGINE HARNESS
CONNECTOR

B&C CLOSED = LOW OIL PRESSURE
A&B CLOSED = OIL PRESSURE OK

Engine Temperature Switch
BATTERY
NEGATIVE

Touch Panel /
Control Board

J-12

Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

112

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

PIN P1-18

8
PIN

HIGH ENGINE
TEMPERATURE
SWITCH

13/BLK

ENGINE HARNESS
CONNECTOR

SW2
OPEN = BELOW 220°F
CLOSED = ABOVE 220°F

M20 331385 (02-2007)

M20 Fuel Pump & Engine Speed Control
(Gas/LPG)
Fuel Pump (Gasoline Only)
i

This drawing shown with key
switch ON, and engine running

J-10
19

PINK/YEL

Refer to the Engine
Controller schematics

6
PIN
19

13/BLK

FROM FUSE 4 OF
ENGINE HARNESS

BLACK

FROM CHASSIS GROUND
OF ENGINE HARNESS

ENGINE HARNESS
CONNECTOR

FUEL PUMP

Speed Control Output
8
PIN

Governor Speed “A”

ENGINE HARNESS
CONNECTORS
YEL/DK.BLUE
Governor Speed “B”

PIN P2-24

PIN P2-25

Refer to the Engine
Controller schematics

J-12

Touch Panel / Control Board

GRAY/DK.BLUE

6
PIN

TO PIN 34
OF ECM

TO PIN 48
OF ECM

J-10
Wiring Color Codes
(Unless otherwise marked)
Right Most Digit
of Wire Number

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

M20 331385 (02-2007)

Low Engine Speed

High Engine Speed

950 (+/- 25)

2400 (+/- 25)

Voltage Speed “A”

5 VDC

0 VDC

Voltage Speed “B”

0 VDC

ENGINE
SPEED
CHART
Engine RPM

113

M20 Fuel Pump
(Diesel)

BATTERY
NEGATIVE

This drawing is shown with key
switch ON, and engine running

FUEL PUMP

M10C

J-11

BATTERY
POSITIVE WHILE
CRANKING FROM
START RELAY M7B

87a

13/BLK

10
PIN
SWITCHED
BATTERY POSITIVE
FROM SHUTDOWN
RELAY M6C

D-5
87

M10B
FUEL
PUMP
RELAY

ENGINE HARNESS
CONNECTOR

Touch Panel /
Control Board

NO CONNECTION

Right Most Digit
of Wire Number

114

Color of Wire

Tan

0
1

Pink

Brown

Orange

Yellow

Green

Blue

Purple

Gray

White

OIL PRESSURE
SWITCH

8
PIN

S-3
5

A
B

ENGINE HARNESS
CONNECTORS

Wiring Color Codes

J-12

PIN P1-19

(Unless otherwise marked)

M10A

13/BLK

10
PIN

J-11

B&C CLOSED = LOW OIL PRESSURE
A&B CLOSED = OIL PRESSURE OK

M20 331385 (02-2007)

M20 Engine Speed Control
(Diesel)
J-12

Touch Panel /
Control Board

PIN P2-24

PIN P2-25

8
PIN

BATTERY
NEGATIVE

Governor Speed “A”
ENGINE HARNESS
CONNECTORS
18

Governor Speed “B”

NO CONNECTION

6
PIN

J-10

Engine RPM

1350

2400

Voltage Speed “A”

5 VDC

0 VDC

Voltage Speed “B”

0 VDC

MAGNETIC
PICK-UP
(ENGINE SPEED)
SENSOR

59
61
GOVERNOR
CONTROLLER

Color of Wire

60
29

J-11

Right Most Digit
of Wire Number

+ -

(Unless otherwise marked)

13/BLK

THROTTLE
ACTUATOR

SWITCHED
BATTERY
POSITIVE
FROM
SHUTDOWN
RELAY M6C

Wiring Color Codes

13/BLK

Low Engine High Engine
Speed
Speed

ENGINE
SPEED
CHART

13/BLK

10
PIN
ENGINE HARNESS
CONNECTOR

Governor Controller Pin Chart
pin

description

INPUT – Battery Positive

Pink

INPUT – Battery Negative

Brown

INPUT – Engine Speed Sensor

Orange

Yellow

INPUT – Engine Speed Sensor

Green

OUTPUT – Throttle Actuator (PWM)

Blue

OUTPUT – Throttle Actuator

Purple

Gray

INPUT – Engine Speed Selection “A”

White

INPUT – Engine Speed Selection “B”

0
1

Tan

M20 331385 (02-2007)

13/BLK

115

M20 Enable/Disable Chart
(Page 1 of 2)
M20 Control Board
Inputs and the Outputs
they Control

Output

Lower
Hopper
Switch
Closed

Raise
Hopper
Switch
Closed

S-5
P1-7

S-5
P1-8

S-6
P1-3

Input
component #

Hopper
Hopper Position
Fuel Level Fuel Pressure
Hopper
Open Hopper Close Hopper
Position
Switch Closed
Sender
Switch Closed Thermal Sentry Door Switch Door Switch
Switch Open
Closed
(Hopper Down)
(Gas, Diesel)
(LPG)
Switch Closed
Closed
(Hopper Up)

S-7
P1-4

S-8
P1-4

S-9
P1-5

S-13
P1-9

S-13
P1-10

Solution
Tank Full
Switch
Closed

Recovery
Tank Full
Switch
Closed

Recovery
Tank Half
Full Switch
Closed

Clogged
Hydraulic Filter
Switch Closed

S-14
P1-12

S-15
P1-13

S-16
P1-14

S-17
P1-15

Notes

Scrub Vacuum Fan Valve
ON

SV-1

P2-28

Main Brush Head Down
Pressure Valve ON

SV-2

P2-4

(SCRUBBING)
Main Brush Head Lower
Valve ON

SV-3

P2-5

(SWEEPING)
Main Brush Head Lower
Valve ON

SV-3

P2-5

Rear and Side Squeegees
Lower
Valve ON

SV-4

P2-6

(SCRUBBING)
Main Brushes Spin
Valve ON

SV-6

P2-5

(SWEEPING)
Main Brushes Spin
Valve ON

SV-6

P2-5

Propel required to to get full
operational down pressure

Hydraulic Enable
Valve ON

SV-7

P2-8

Turns OFF automatically if not
required (SV-7 is required for
all hydraulic functions
EXCEPT sweep and scrub
vacuum fans)

Side Brush Spin
Valve ON

SV-8

P2-9

Sweep Vacuum Fan
Valve ON

SV-9

P2-10

Side Brush Down Pressure
Valve ON

SV-10

P2-11

Side Brush Lower
Valve ON

SV-11

Side Brush Extend
Valve ON

SV-12

Hopper Lower
Valve ON

SV-13

P2-31

All sweep or scrub functions
are cancelled as long as
switch is closed

Hopper Lift
Valve ON

SV-14

P2-7

Mechanical hopper latch must
release for hopper to lift from
full down position; All sweep or
scrub functions are cancelled
as long as switch is closed

Hopper Door Open
Valve ON

SV-15

P2-15

P2-12
P2-9

Refer to Notes

Refer to
Notes

D
D
scrub only

Propel required to to get full
operational down pressure

D
scrub only

All sweep or scrub functions
are cancelled as long as
switch is open; Hopper door
closes automatically when
hopper down is sensed

Auto-Fill Solution Tank
Valve ON

SOL-1

P2-13

Auto-Fill Recovery Tank
Valve ON

SOL-2

P2-14

Main Brushes Solution
Valve ON

SOL-3

P2-19

ES Pump ON OR FaST
Enable Valve, Air Pump &
Water Pump Relay ON

SOL-4,
M11

P2-22

FaST High Flow
Valve ON

SOL-5

P2-23

FaST Side Brush
Valve ON

SOL-6

P2-26

Side Brush Solution Valve
ON

SOL-7

P2-20

Hopper Latch
Solenoid ON

SOL-9

P2-32

Shaker Motor ON

M3A

P2-16

Reverse Propel

M4A

P2-17

Shut Down Relay ON

M6A

P2-18

Detergent Pump ON OR
FaST Detergent Pump ON

n/a

P2-21

Audible Alarm

n/a

P2-29

Low Engine Oil
Pressure Lamp

n/a

P2-27

Governor Speed Bit "A"

n/a

P2-24

Governor Speed Bit "B"

n/a

P2-25

Propel required to to get full
operational down pressure

D
D
D
D
ES Pump
only

E
ES Pump
only

when low

E
If low oil pressure, engine
ECM will shutdown the engine
after a time delay

E = Input required to ENABLE output
D = Input required to DISABLE output

116

M20 331385 (02-2007)

M20 Enable/Disable Chart
(Page 2 of 2)
M20 Control Board
Inputs and the Outputs
they Control

Output

Soution
Hydraulic Oil
Scrub
Clogged
Tank Empty Temperature
Vacuum
Sweep Filter
Switch
Sensor above Open Switch
Switch Closed
Closed
230F
Closed

Input
component #
pin

Scrub Vacuum Fan Valve
ON

SV-1

P2-28

Main Brush Head Down
Pressure Valve ON

SV-2

P2-4

(SCRUBBING)
Main Brush Head Lower
Valve ON

SV-3

(SWEEPING)
Main Brush Head Lower
Valve ON

SV-3

Rear and Side Squeegees
Lower
Valve ON

S-18
P1-16

S-19
P1-11

S-20
P1-17

S-21
P1-6

Impact
Sensor
Closed

S-23
P1-21

Propel Pedal Propel Pedal Propel Pedal
Touch Panel Input Required to
Sensor
Sensor
Sensor
ENABLE
FORWARD REVERSE NEUTRAL

n/a
P1-1

see notes

Touch Panel Input Required to
DISABLE

Notes

n/a
P1-1
OneStep Scrub ON;
Squeegee/Scrub Vacuum
ON

OneStep Scrub OFF; OneStep
Sweep ON; Squeegee/Scrub
Vacuum OFF; Low Engine Speed
Selected

Refer to
Notes

OneStep Scrub ON;
OneStep Sweep ON

OneStep Scrub OFF; OneStep
Sweep OFF; Low Engine Speed
Selected

Propel required to to get full
operational down pressure

E
see notes

Refer to
Notes

OneStep Scrub ON

see notes

OneStep Scrub OFF; OneStep
Sweep ON; Low Engine Speed
Selected

Propel required to to get full
operational down pressure

P2-5

Refer to
Notes

OneStep Sweep ON

OneStep Sweep OFF; OneStep
Scrub ON; Low Engine Speed
Selected; Squeegee/Scrub
Vacuum ON

Propel required to to get full
operational down pressure

SV-4

P2-6

OneStep Scrub ON;
Squeegee/Scrub Vacuum
ON

OneStep Scrub OFF; OneStep
Sweep ON; Low Engine Speed
Selected; Squeegee/Scrub
Vacuum OFF

(SCRUBBING)
Main Brushes Spin
Valve ON

SV-6

P2-5

(SWEEPING)
Main Brushes Spin
Valve ON

SV-6

P2-5

Hydraulic Enable
Valve ON

SV-7

P2-8

Side Brush Spin
Valve ON

SV-8

P2-9

Sweep Vacuum Fan
Valve ON

SV-9

P2-10

Side Brush Down Pressure
Valve ON

SV-10

P2-11

Side Brush Lower
Valve ON

SV-11

P2-12

Side Brush Extend
Valve ON

SV-12

P2-9

Hopper Lower
Valve ON

SV-13

P2-31

Hopper Lift
Valve ON

SV-14

P2-7

Hopper Door Open
Valve ON

SV-15

P2-15

SOL-1

P2-13

SOL-2

P2-14

SOL-3

P2-19

SOL-4,
M11

P2-22

SOL-5

P2-23

SOL-6

P2-26

SOL-7

P2-20

SOL-9

P2-32

Shaker Motor ON

M3A

P2-16

Reverse Propel

M4A

P2-17

Shut Down Relay ON

M6A

P2-18

Detergent Pump ON OR
FaST Detergent Pump ON

n/a

P2-21

Auto-Fill Solution Tank
Valve ON
Auto-Fill Recovery Tank
Valve ON
Main Brushes Solution
Valve ON
ES Pump ON OR FaST
Enable Valve, Air Pump &
Water Pump Relay ON
FaST High Flow
Valve ON
FaST Side Brush
Valve ON
Side Brush Solution Valve
ON
Hopper Latch
Solenoid ON

P2-5

Audible Alarm

n/a

P2-29

Low Engine Oil
Pressure Lamp

n/a

P2-27

Governor Speed Bit "A"

n/a

P2-24

Governor Speed Bit "B"

n/a

P2-25

M20 331385 (02-2007)

E
see notes

Refer to
Notes

OneStep Scrub ON

see notes

OneStep Scrub OFF; OneStep
Sweep ON; Low Engine Speed
Selected

Propel required to to get full
operational down pressure

Refer to
Notes

OneStep Sweep ON

OneStep Sweep OFF; OneStep
Scrub ON; Low Engine Speed
Selected; Scrub Vacuum ON

Propel required to to get full
operational down pressure

Turning ON Any Touch
Panel Function OR
Selecting High Engine
Speed

Refer to Notes

Turns OFF automatically if not
required (SV-7 is required for
all hydraulic functions
EXCEPT sweep and scrub
vacuum fans)

Side Brush ON (after
OneStep Scrub ON OR
OneStep Sweep ON)

OneStep Scrub OFF; OneStep
Sweep OFF; Low Engine Speed
Selected; Side Brush OFF

Side Brush ON (after
OneStep Scrub ON OR
OneStep Sweep ON)

OneStep Scrub OFF; OneStep
Sweep OFF; Low Engine Speed
Selected; Side Brush OFF

Side Brush ON (after
OneStep Scrub ON OR
OneStep Sweep ON)

OneStep Scrub OFF; OneStep
Sweep OFF; Low Engine Speed
Selected; Side Brush OFF

E
All sweep or scrub functions
are cancelled as long as
switch is closed
Mechanical hopper latch must
release for hopper to lift from
full down position; All sweep or
scrub functions are cancelled
as long as switch is closed
All sweep or scrub functions
are cancelled as long as
switch is open; Hopper door
closes automatically when
hopper down is sensed

E
If low oil pressure, engine
ECM will shutdown the engine
after a time delay

E = Input required to ENABLE output
D = Input required to DISABLE output

117

M20 Control Board Connectors
socket # wire #

P1-1
P1-2
P1-3
P1-4
P1-5
P1-6
P1-7
P1-8
P1-9
P1-10
P1-11
P1-12
P1-13
P1-14
P1-15
P1-16
P1-17
P1-18
P1-19
P1-20
P1-21
P1-22
P1-23

91
x
89
30
31
39
35
36
42
43
177
44
45
46
90
48
78
12
9
x
49
x
105

socket # wire #

118

color

goes to

type

pink input
x
x
white input
tan
input
pink input
white input
green input
blue input
brown input
orange input
purple input
yellow input
green input
blue input
tan
input
gray input
gray input
brown input
white input
x
x
white input
x
x
green ground

S-6
S-7 or S-8
S-9
S-21
S-5
S-5
S-13
S-13
S-19
S-14
S-15
S-16
S-17
S-18
S-20
SW2

S-23

type

P2-1
P2-2
P2-3
P2-4
P2-5
P2-6
P2-7
P2-8
P2-9
P2-10
P2-11
P2-12
P2-13
P2-14
P2-15
P2-16
P2-17
P2-18
P2-19
P2-20
P2-21

14
14
81
57
58
59
60
61
62
63
64
66
65
67
68
69
70
71
72
181
74

yellow
yellow
pink
purple
gray
white
tan
pink
brown
orange
yellow
blue
green
purple
gray
white
tan
pink
brown
pink
yellow

P2-22

green output

P2-23
P2-24
P2-25
P2-26
P2-27
P2-28
P2-29
P2-30
P2-31
P2-32
P2-33
P2-34
P2-35

79 white output
11
pink output
18
gray output
80
tan output
28
gray output
56
blue output
182 brown output
x
x
x
53 orange output
138 gray output
13 black ground
13 black ground
13 black ground

Forward/Reverse Propel Sensor
empty
Hopper Position Switch
Fuel Level Sensor or Pressure Switch
Thermal Sentry Switch
Scrub Vacuum Open Switch
Hopper Up/Down Switch
Hopper Up/Down Switch
Hopper Door Open/Close Switch
Hopper Door Open/Close Switch
Solution Tank Empty Switch
Solution Tank Full Switch
Recovery Tank Full Switch
Recovery Tank Half Full Switch
Clogged Hydraulic Filter Switch
Clogged Shaker Filter Switch
Hydraulic Temperature Sensor
High Engine Temperature Switch
Engine Oil Pressure Signal
empty
Impact Sensor
empty
Static Ground

goes to

power
power
power
output
SV-2
output SV-3, SV-6
output
SV-4
output
SV-14
output
SV-7
output SV-8, SV-12
output
SV-9
output
SV-10
output
SV-11
output
SOL-1
output
SOL-2
output
SV-15
output
M3A
output
M4A
output
M6A
output
SOL-3
output
SOL-7
output

Switched Battery Positive
Switched Battery Positive
Unswitched Battery Positive
Brush Head Pressure Solenoid Valve
Brush Head Down & ON Solenoid Valves
Squeegees Down Solenoid Valve
Hopper Up Solenoid Valve
Hydraulic Enable Solenoid Valve
Side Brush ON & Extend Solenoid Valves
Sweep Vacuum Fan Solenoid Valve
Side Brush Pressure Solenoid Valve
Side Brush Down Solenoid Valve
Solution Tank Auto Fill Water Valve
Recovery Tank Auto Fill Water Valve
Hopper Door Open Solenoid Valve
Shaker Relay
Reverse Relay
Shutdown Relay
Main Brush Head Water Valve
Side Brush Water Valve
Detergent Pump or FaST Pressure Switch
ES Pump or FaST Enable Valve, Air Pump,
SOL-4, M11A
Water Pump Relay
SOL-5
FaST High Flow Valve
ECM (Governor Speed Bit "A")
ECM (Governor Speed Bit "B")
SOL-6
FaST Side Brush Valve
Low Engine Oil Pressure Lamp
SV-1
Scrub Vacuum Fan Valve
Audible Alarm
empty
SV-13
Hopper Down Solenoid Valve
SOL-9
Hopper Latch Solenoid
Unswitched Battery Negative
Unswitched Battery Negative
Unswitched Battery Negative

Connector
P1

Viewed from wire
side of connector

Connector
P2

Viewed from wire
side of connector

M20 331385 (02-2007)

M20 Fault Indicators

The following table describes fault codes communicated to the operator. A fault code is
indicated by blinking a Fault LED (red), sounding an alarm, and also by displaying the fault
name on the LCD. Faults can be cleared when they are no longer present and one of the
action buttons (i.e. One-Step) is depressed. If there is more than one fault, they are displayed
for about a second, one after the other.

Fault

LCD Display

Description

F1: HOPPER UP

Indicates and prevents an attempt to
engage Scrub/Sweep systems without
the hopper down switch engaged.

Hydraulic Filter
Clogged

F3: CLOGGED HYD.

Indicates the hydraulic filter is clogged.

Sweep Filter
Clogged

F4: SHAKER FILTER

Indicates the Sweep dust filter is
clogged.

Hopper Fire

F5: HOPPER FIRE

Indicates that the hopper is too hot due
to fire, etc. Turns off entire sweep
system.

Solution Tank empty

F6: SOL. TANK E

Indicates the solution tank is empty.

Recovery Tank Full

F7: REC. TANK FULL

Indicates the recovery tank is full and
shuts down the entire Scrub system.

High Engine
Temperature

F8: HIGH ENG TEMP

Indicates high engine temperature.

High Hydraulic
Temperature

F9: HIGH HYD TEMP

Indicates excessive hydraulic
temperature

F10: LOW FUEL

Low fuel indicator (blinking lowest fuel
gauge block).

F11: OPEN SCB VAC

Indicates squeegee may have broken
free.

Hopper Up Error

Low Fuel
Squeegee
Disconnected
(Option)

M20 331385 (02-2007)

119

M20 Condition & Warning Indicators

The following table describes displayed conditions or warnings. If a condition is sensed,
the condition or warning code will be displayed on the LCD. Conditions are typically
caused by activating buttons that are unavailable. For example: the Sweep vacuum fan
is unavailable when the scrub functions are active.

Condition
Squeegee Vacuum button is
activated with Sweep
system active.
Sweep Vacuum button is
activated with Scrub system
active.

FaST system is selected by
the operator and the
machine is not configured
with the FaST option.
ES system is selected by the
operator and the machine is
not configured with the ES
option.
FaST or ES system is
selected by the operator and
the machine is not
configured with the ES or
FaST option.
Side Brush button is
activated alone without
1-STEP Sweep/Scrub.

120

LCD DISPLAY

Description

C1: NO SQGE/VAC

When Sweep system is active,
the Scrub vacuum is
unavailable.

C2: NO SWEEP VAC

When Scrub system is active,
the Sweep vacuum is
unavailable.

C3: NO FAST MODE

Only machines with the FaST
system installed (and
programmed to be FaST
machines) can turn ON the
FaST system.

C4: NO ES MODE

Only machines with the ES
system installed (and
programmed to be ES
machines) can turn ON the ES
system.

C5: NO ES/FAST

Only machines with the ES or
FaST system installed (and
programmed to be ES or Fast
machines) can turn ON the ES
or FaST system.

C6: NO SIDE BRUSH

The M20 machine is NOT
programmed to operate with
only the side brush ON.

M20 331385 (02-2007)

M20 Configuration Modes
(Page 1 of 4 )

Configuration modes are designed for use by a technician for setup purposes.
To enter the Configuration modes:
1)
Press “4/5” and Side-Brush buttons simultaneously.
2)
While holding the “4/5” and Side-Brush buttons, turn the ignition key switch to the “RUN” position.
3)
Continue holding the “4/5” and Side-Brush buttons until “CONFIG MODE” is displayed on the screen,
then release the buttons.
While In Configuration Mode:
Each single activation of the “2/3” button will scroll through the various configurations available. Each
configuration is displayed one at a time on the LCD. Once the desired configuration mode is displayed,
push the “0/1” to select the displayed mode.
To enter Pressure Adjust Mode:
1)
Enter Configuration Mode.
2)
Press “2/3” button until “PRESS. ADJ MODE” is displayed.
3)
Press “0/1” button again to select pressure adjust mode. “READY” is displayed on LCD screen.
The following table shows the different configuration modes the machine can be placed in.
Mode

Entry Sequence / Indicator

Function / Notes

Reset Default
down
pressures

1) Enter Configuration Mode, then put the
machine into Pressure Adjust Mode.
2) Press “4/5” button to reset all the down
pressures. “SET TO DEFAULT” is displayed
on LCD screen.

Resets all the down pressure defaults to the
factory default levels.

Adjusting the
Main Scrub
brush down
pressure

1) Enter Configuration Mode, then put the
machine into Pressure Adjust Mode.
2) Press 1-STEP Scrub button to select
Scrub pressure adjust. The 1-STEP Scrub
LED is ON.
3) Use brush pressure “+” or “-” buttons to
select which pressure level to adjust
(Low/Medium/High).
4) Press “0/1” button to increase the down
pressure OR press “8/9” button to decrease
the down pressure.
5) Press 1-STEP Scrub button again or turn
key switch OFF to save new down pressure
settings.

Adjusts main scrub brush down pressures.
Bars on bar graph represent solenoid valve
current when adjusting the down pressure.
Each bar indicates approximately 125mA of
valve current.

Adjusting the
Main Sweep
brush down
pressure

1) Enter Configuration Mode, then put the
machine into Pressure Adjust Mode.
2) Press 1-STEP Sweep button to select
Sweep pressure adjust. The 1-STEP Sweep
LED is ON.
3) Use brush pressure “+” or “-” buttons to
select which pressure level to adjust
(Low/Medium/High).
4) Press “0/1” button to increase the down
pressure OR press “8/9” button to decrease
the down pressure.
5) Press 1-STEP Sweep button again or turn
key switch OFF to save new down pressure
settings.

Adjusts main sweep brush down pressures.
Bars on bar graph represent solenoid valve
current when adjusting the down pressure.
Each bar indicates approximately 125mA of
valve current.

M20 331385 (02-2007)

121

M20 Configuration Modes
(Page 2 of 4)

To enter the Configuration modes:
1)
Press “4/5” and Side-Brush buttons simultaneously.
2)
While holding the “4/5” and Side-Brush buttons, turn the ignition key switch to the “RUN” position.
3)
Continue holding the “4/5” and Side-Brush buttons until “CONFIG MODE” is displayed on the screen,
then release the buttons.
While In Configuration Mode:
Each single activation of the “2/3” button will scroll through the various configurations available. Each
configuration is displayed one at a time on the LCD. Once the desired configuration mode is displayed,
push the “0/1” to select the displayed mode.
To enter Pressure Adjust Mode:
1)
Enter Configuration Mode.
2)
Press “2/3” button until “PRESS. ADJ MODE” is displayed.
3)
Press “0/1” button again to select pressure adjust mode. “READY” is displayed on LCD screen.

122

Mode

Entry Sequence / Indicator

Function / Notes

Adjusting the
Side Scrub
brush down
pressure

1) Enter Configuration Mode, then put the
machine into Pressure Adjust Mode.
2) Press Side Brush button to select Side
Scrub Brush pressure adjust. The Side
Brush LED is ON.
3) Use brush pressure “+” or “-” buttons
to select which pressure level to adjust
(Low/Medium/High).
4) Press “0/1” button to increase the
down pressure OR press “8/9” button to
decrease the down pressure.
5) Press Side Brush button again or turn
key switch OFF to save new down
pressure settings.

Adjusts Side Scrub brush down pressures. Bars
on bar graph represent solenoid valve current
when adjusting the down pressure. Each bar
indicates approximately 125mA of valve current.

Adjusting the
Side Sweep
brush down
pressures

1) Enter Configuration Mode, then put the
machine into Pressure Adjust Mode.
2) Press Sweep Vacuum Fan button to
select Side Sweep Brush pressure adjust.
The Sweep Vacuum Fan LED is ON.
3) Use brush pressure “+” or “-” buttons
to select which Side Sweep Brush
pressure level is desired
(Low/Medium/High).
4) Press Sweep Vacuum Fan button
again or turn key switch OFF to save new
down pressure settings.

Adjust sweeping side brush down pressure.
Note: Only one of three Side Sweep down
pressure settings can be selected. The Side
Brush pressure does not increase when Main
Brush pressure is increased during SWEEP
FUNCTION ONLY.

M20 331385 (02-2007)

M20 Configuration Modes
(Page 3 of 4)

Mode

Entry Sequence / Indicator

Function / Notes

Disable
BOTH the ES
and FaST
systems

1) Enter Configuration Mode.
2) Press “2/3” button until “C5: NO
ES/FAST” is displayed.
3) Press “0/1” button to disable ES and
FaST systems. “DONE” is displayed on
LCD screen.

This is a set-up mode that disables both ES and
FaST functions.

Enable the
FaST system
(also disables
the ES
system)

1) Enter Configuration Mode.
2) Press “2/3” button until “FAST MODE”
is displayed.
3) Press “0/1” button to enable the FaST
system. “DONE” is displayed on LCD
screen.

This is a set-up mode that enables the FaST
system, and disables the ES system.

Enable the
ES system
(also disables
the FaST
system)

1) Enter Configuration Mode.
2) Press “2/3” button until “ES MODE” is
displayed
3) Press “0/1” button to enable the ES
system. “DONE” is displayed on LCD
screen.

This is a set-up mode that enables the ES
system, and disables the FaST system.

LCD Display
Contrast
Adjust mode

1) Enter Configuration Mode.
2) Press “2/3” button until “CONTRAST
ADJUST” is displayed.
3) Press “0/1” button to select mode.
“SET CONTRAST” is displayed on
screen.
4) Press and hold “0/1” button to increase
screen contrast OR press and hold “8/9”
to decrease screen contrast.

This allows the setting of the contrast of the LCD
screen display.

M20 331385 (02-2007)

123

M20 Configuration Modes
(Page 4 of 4)

Mode

Entry Sequence / Indicator

Function / Notes

Detergent
delivery
level
adjustment
mode

1) Enter Configuration Mode.
2) Press “2/3” button until “SET DET
LEVEL” is displayed.
3) Press “0/1” button to enter mode.
“READY” is displayed on screen.
4) Press button shown below to select
the desired detergent delivery level:
“0/1” – HEAVY
“2/3” – NORMAL
“4/5” – LIGHT
“6/7” – OFF
The selected level is displayed on screen.

Allows for the adjustment of the Detergent
level flow. There are four selections: HEAVY,
NORMAL, LIGHT, and OFF.

Water
delivery
level
adjustment
mode

1) Enter Configuration Mode.
2) Press “2/3” button until “SET WATER
LEVEL” is displayed.
3) Press “0/1” button to enter mode.
“READY” is displayed on screen.
4) Press button shown below to select
the desired water delivery level:
“0/1” – HEAVY WATER
“2/3” – NORMAL WATER
“4/5” – ECONOMY WATER
The selected level is displayed on screen.

Allows for the adjustment of the Water flow.
There are three selections: HEAVY,
NORMAL, and ECONOMY.

Side Brush
Mode

1) Enter Configuration Mode.
2) Press “2/3” button until “SIDE_BRUSH
_MODE” is displayed.
3) Press “0/1” button to observe
“SIDE_SWEEP&SCRUB” or
“SIDE_SWEEP_ONLY”
4) Press 1-STEP Scrub button to toggle
between modes.
5) After desired mode is displayed, press
“2/3” button to continue to a different
mode or turn key switch OFF to save new
setting.

This mode allows the machine to be set-up
as a Side Sweep ONLY machine OR Side
Sweep AND Side Scrub machine.
Note: There will be NO solution delivery to
Side Brush when in Scrub mode if
“SIDE_SWEEP_ONLY” is selected.

124

NOTE: “NORMAL” means factory default
detergent delivery level.

NOTE: “NORMAL” means factory default
water delivery level.

M20 331385 (02-2007)

M20 Diagnostic Modes
(Page 1 of 2)

Mode

Self Test
Mode

Entry Sequence / Indicator

Function / Notes

1) Enter Configuration Mode.
2) Press “2/3” button until “SELF
TEST” is displayed.
3) Press “0/1” button to run the
self test. When Self Test is
finished, “DONE” & the software
revision date is shown (mmddyy).

This diagnostic test determines the status of the
electrical load on each output. All output pins with
open or shorted electrical loads are displayed on the
screen with the control board pin number, and the
condition of that output. If no faults are detected an
“OK” message is displayed.

Self Test Mode Notes:
• The LCD screen will show “DONE” when the Self-Test is complete. It will not show
“PASS” or FAIL”.
• All unused outputs will show “OPEN” if the machine is not equipped with certain options.
Some examples of this may be:
– Solution Tank Auto Fill Valve (P2-13 OPEN)
– Recovery Tank Auto Fill Valve (P2-14 OPEN)
• The Detergent Pump output (P2-21) will show “OPEN” on machines equipped with the
FaST system because of the FaST Water Pressure Switch (open when Water Pump is not
running). To allow the Self-Test to check the FaST Detergent Pump output, place a jumper
wire across the terminals of the FaST Water Pressure Switch harness connector.

Manual
Mode

M20 331385 (02-2007)

1) Enter Configuration Mode.
2) Press “2/3” button until
“MANUAL MODE” is displayed.
3) Press “0/1” button to select
Manual Mode. “MANUAL MODE
OPR” is displayed on screen.

Allows the technician to turn on machine functions
regardless of the status of the sensed inputs.
EX: The ES pump will turn on when ES is selected,
regardless of the state of the tank float switches.

125

M20 Diagnostic Modes
(Page 2 of 2)

Mode

Entry Sequence / Indicator

Function / Notes

Input Display
Mode

1) Enter Configuration Mode
2) Press “2/3” button until “INPUT
MODE” is displayed.
3) Press “0/1” button to select
Input Mode. “READY” is displayed
on screen.

Each LED on the panel represents the state of one
of the control board inputs. If the input is grounded
(0V), the associated LED is turned ON. If the input
NOT grounded (open), the associated LED is turned
off. Each input (bold) has an associated LED as
described below:

(This mode is
used to test input
sensors and
circuitry)

126

LED

Input

One Step Scrub LED
Shaker LED
Squeegee/Scrub Vacuum Fan LED
One Step Sweep LED
Sweep Vacuum Fan LED
Low Engine Speed LED
High Engine Speed LED
ES LED
FaST LED
Side Brush LED
Scrub Pressure High LED
Scrub Pressure Medium LED
Scrub Pressure Low LED
Solution Level High LED
Solution Tank Medium LED
Solution Tank Low LED
Red warning LED

Clogged Hydraulic Filter
Clogged Shaker Filter
High Engine Temp
Hopper Up Select
Hopper Down Select
Reverse
Forward
Thermal Sentry
Hopper Down Position
Impact Sense
Hopper Door Open
Hopper Door Close
Solution Tank Empty
Solution Tank Full
Recovery Tank Full
Recovery Tank Half Full
Open Scrub Vacuum

M20 331385 (02-2007)

M20
HYDRAULIC
Troubleshooting Information
BEFORE CONDUCTING TESTS:
* Read and Follow ALL Safety Warnings and Precautions as
mentioned at the beginning of this manual
* Engine & Hydraulic Oil Must Be At Normal Operating Temperatures
after Running Machine and Hydraulics a Minimum of 5 Minutes
* Examine Machine For Any Linkage Binding or Mechanical
Problems

DURING TESTS:
* Call Technical Services if Diagnostic Time Exceeds One Hour With
Unknown Cause or Course of Action

* Maintain Normal Main Brush Pressure as Listed in Operator's
Manual

NOTE: Troubleshooting charts may be shown with optional equipment.
The optional equipment is not specified in these charts. Some machines
may not be equipped with all components shown.

M20 331385 (02-2007)

127

M20 Hydraulic Schematic
SV3 & SV6 TIED TOGETHER
Scrub Valve

RV3

Sweep Valve

500 PSI

SV2
C1

SV3

SV13

G2
C2
T1

PC1

SV4

PC2
P7
0.055

SV6

UP
PC5 C9 0.028
SV14
SV15
G11
OR2

LH Side
RH SideTubes

0.031

C3
0.046

0.031 C12

UP
(SPRING Tube
UP)

C4 0.031

Rear
Side & Rear
Squeegee

Main
4.5 cir, 400 rpm

Hopper Lift

OR1

Main Scrub Lift

Hopper Door

PC6 0.040 C11

C10
P5 P6

Tube
Tube

Tube

Side Valve

P4 SV8 & SV11 TIED TOGETHER
G13

0.040

CV1
SV7

OR3

SV11

Side Scrub
Lift
LIFT

C8
G5

RV2

SV10
PR1

2500 psi

400 psi

RV1
G6

Tube

2500 psi
SV1

SV12

Sweep Fan
0.194 cir
SV 9

PC8

G10
C5

G7
C7
Side Scrub
Extend
RETRACT

T3
Tube
SV8

1800 psi

Scrub Fan
0.129 cir

Check M2
Valve
25 psi

Side Scrub

P
Propel
Motor
19.0 cir
Hot Oil
Shuttle
Valve

Engine,
2400 rpm
Propel Pump
4000 psi Forward
RV, 3000 psi
Reverse RV, 1.24 cir

External
Charge
Port
0.97 .61

T 1160 psi
Steering Unit
6.1 cir
0.40
Gear Pump

SteeringCyl

Coupling

Cooler
Filter
35 psi bypass

Filter Indicators

Screen

128

Oil
Reservoir
Temp Sender
NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 1 of 19)

Hydraulic Hose Group, Steering and Propel

Reservoir

Out
L
Steering
Valve

Aux Pump

1
4

Propel Pump

Steer
Cylinder

Wheel Drive
Motor

354392

Ref.
1
2
3
4
5
6

Part No.
1023608
396221
1023489
1023488

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)

Description
Hose, Hyd, Tc08, Jf08e45/Jf08str, 96.0
Hose, Hyd, Tc06, Jf06e90/Jf06str, 104.0
Hose, Hyd, Tc06, Jf06e90/Jf06str, 040.0
Hose, Hyd, Spcl, Jf10e45/Jf10str, 58.0
Hose, Hyd, Spcl, Jf10e90/Jf10str, 63.0
Hose, Hyd,Med04, Jf04str/Jf04str, 066.0

Qty.
1
1
2
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

129

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 2 of 19)

Hydraulic Hose Group, Pump and Vacuum Fans

1
Vac Fan
Motor
(Scrub)

P1 Scrub Valve
P2

T2
T1
Reservoir

Vac Fan
Motor
(Sweep)

4
5

6
14

7
Aux Pump
Propel Pump

11
10

9
8
Cooler

12
NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
130

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 3 of 19)

Hydraulic Hose Group, Pump and Vacuum Fans

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

Part No.
361044
381862
396255
1026645
1023607
1023611
396266
71735
396438
1023487
1023606

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Hose, Hyd, Tc08, Jf08e90/Jf08str, 046.0
Hose, Hyd, Med06, Jf06str/Jf06str, 018.0
Hose, Hyd, Tc08, Jf08str/Jf08str, 024.0
Hose, Hyd, Tc08, Jf08str/Jf08e90, 031.0
Hose, Hyd, Tc08, Jf08e45/Jf08str, 26.0
Hose, Hyd, Med06, Jf06str/Jf06str, 022.0
Hose, Hyd, Med08, Jf08str /Jf08e45, 21.0
Hose, Hyd, Suc20, Jf20str /Jf20e90, 29.0
Hose, Hyd, Med08, Jf08e90/Jf08str, 031.0
Hose, Hyd, Med06, Jf06e90/Jf06str, 042.0
Hose, Hyd, Med10, Jf10str/Jf10str, 41.0
Hose, Hyd, Tc12, Jf12e90/Jf12str, 044.0
Hose, Hyd, Med12, Jf12e90/Jf12str, 50.0
Hose, Hyd, Tc08, Jf08str/Jf08str, 21.0

Qty.
1
1
1
1
1
1
1
1
1
1
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

131

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 4 of 19)

Hydraulic Hose Group, Brush and Hopper
Hopper Lift
Cylinder

Scrub Valve
M1

Sweep Valve

C9
C10
C12

C11

Main Brush
Motor
(Front)

Hopper Dump
Door Cylinder

Brush LIft
Cylinder

Main Brush
Motor
(Rear)

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
132

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 5 of 19)

Hydraulic Hose Group, Brush and Hopper

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

Part No.
1027321
1025548
1026733
1024688
1023769
57946
1025544

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)

Description
Hose, Hyd, Tc04, Jf04str /Jf04e90, 88.0
Hose, Hyd, Tc04, Jf04str /Jf04e90, 70.0
Hose, Hyd, Tc06, Jf06str /Jf06e45, 54.0
Hose, Hyd, Spcl, Jf04str/Jf04str, 115.0
Hose, Hyd, Spcl, Jf04str/Jf04str, 121.0
Hose, Hyd, Tc08, Jf08str/Jf08str, 48.0
Hose, Hyd, Tc 06, Jf06str /Jf06e45, 56.0
Hose, Hyd, Med04, Jf04e90/Jf04str, 016.0
Hose, Hyd, Tc08, Jf08e90/Jf08str, 13.0
Hose, Hyd, Med08, Jf08str/Jf08str, 022.0

Qty.
1
1
1
1
1
1
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

133

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 6 of 19)

Hydraulic Hose Group, Squeegee Lift

2
C3
Scrub Valve

Rear Squeegee
Lift Cylinder

3
3

5
Right Side
Squeegee
Lift Cylinder

4
Left Side
Squeegee
Lift Cylinder

4
5

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
134

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 7 of 19)

Hydraulic Hose Group, Squeegee Lift

Ref.
1
2
3
4
5

Part No.
1025551
1030709
1025550

Serial Number
(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)

Description
Hose, Hyd, Spcl, Jf04str/Jf04str, 121.0
Hose, Hyd, Spcl, Jf04str/Jf06str, 125.0
Hose, Hyd,Tc 04, Jf04str /Jf04e45 , 35.0
Hose, Hyd, Tc04, Jf04e45/Qm06, 28.0
Hose, Hyd, Tc04, Jf04e45/Qm06, 26.0

Qty.
1
1
2
2
2

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

135

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 8 of 19)

Hydraulic Pumps Group
11

9
5

6
8
2

1
12

H
4

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
136

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 9 of 19)

Hydraulic Pumps Group

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

Part No.
44868
44869
53076
21198
1022666
65145--1
47513
56821
67811

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)

Description
Pump, Hyd, Piston, Var, 1.24 4000, Cw (See Breakdown)
Fitting, Hyd, E90, Jm08/Om08
Fitting, Hyd, Str, Jm08/Om08
Fitting, Hyd, E90, Jm10/Om12
Screw, Hex, .38--16 X 1.25, 5
Washer, Flat, 0.38 Sae
Pump, Hyd, Gear, Ext, 3, 00.97 2500, Cw
Seal, Org, .069 X 3.06id
Fitting, Hyd, E45, Jm08/Om10
Fitting, Hyd, E90, Jm08/Om10
Fitting, Hyd, E90, Jm06/Om08
Fitting, Hyd, Str, Jm20/Om16

Qty.
1
1
1
2
22
2
1
11
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

137

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 10 of 19)

Hydraulic Cooler and Tubes Group
19
21
22

19
20

24
4

15
10

1
17
5

9
16

8
6
2

138

5
7

8
12

9
NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 11 of 19)

Hydraulic Cooler and Tubes Group

Ref.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

Part No.
46481
62471
1026319
1026126
39277
32491
07791
51787
53466
1027002
1028821
1028822
74455
1028823
35904
1026647
32492
41430
50161

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Cooler, Hyd, 25gpm 325btu Of12 13x12x2
Fitting, Hyd, E90, Jm12/Om12
Fitting, Hyd, E90, Jm12/Om12, L
Bracket Wldt, Cooler, Hyd Fluid
Pad, Tank, Hyd
Clamp, Cable, Stl, 1.00d X 0.62w, 1h
Screw, Hex, M8 X 1.25 X 25, 8.8
Washer, Flat, 0.31 Std
Nut, Hex, Flng, M8 X 1.25
Bumper, Rbr, 0.6d 0.34t .3d Tip
Tube, Hyd, Main Return [M20]
Clamp, Cable, Stl, 1.50d X 1.00w, 1h
Fitting, Hyd, Str, Spcl
Tube, Hyd, Sqge
Tube, Hyd, Sqge
Clamp, Cable, Stl, 0.44d X 0.62w, 1h
Screw, Hex, M6 X 1.0 X 12, Fmg
Tube, Hyd, Rear Sqge [M20]
Nut, Ftg, Hyd, 0.56--18
Angle, Mtg, Stl, .12 1.6 1.6 02.2l
Screw, Hex, M10 X 1.5 X 25, 8.8
Washer, Flat, 0.38 Std
Nut, Hex, Lock, M10 X 1.5, Nl
Fitting, Hyd, Cap, Jf04
Fitting, Hyd, Cap, Jf08

Qty.
1
1
1
1
4
1
9
15
9
1
1
1
4
1
1
2
1
2
2
1
1
1
1
2
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

139

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 12 of 19)

Hydraulic Reservoir Group
2

8
9

1
18
17

3
5
10

9
14
5

15
11
12
7

16
7

140

M20 331385 (02-2007)

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 13 of 19)

Hydraulic Reservoir Group

o
Y
Y

Ref.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18

Part No.
25122
65215
56690
46482
1026126
39277
32491
1023545
71726
1021579
55455
58592
1025132
1034878

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Reservoir, Hyd, 10.0 Gal
Cap, Breather, Hyd, 2.4 Ds
Gauge, Sensing, Level
Fitting, Hyd, Str, Jm06/Om06
Fitting, Hyd, Plug, Om06
Fitting, Hyd, Str, Jm08/Om08
Pad, Tank, Hyd
Screw, Hex, M8 X 1.25 X 25, 8.8
Washer, Flat, 0.31 Std
Fitting, Hyd, E45, Jm12/Om16
Strainer, Hyd, 25gpm 100mesh Psi
Fitting, Hyd, E45, Jm20/Om20
Filter Assy [Pt4 936498]
Fitting, Hyd, E90, Jm04/Pm02
Send--Unit, Water, Temp, 04npt 113oh/195d
Fitting, Hyd, Plug, Om10
Indicator, Press, 60psi
Insulation, Thermal, Hydraulic Blanket

Qty.
1
1
1
2
3
1
2
2
2
1
1
1
1
1
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

141

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 14 of 19)

Hydraulic Valves Group

28
17

M4
19

17
16

25
24

P2
7

M1
29
C2

T1
27

26
30

14
13
9
10
T5
P6
4
6
12

C12

11
1

C11
C10
7

142

3
5

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 15 of 19)

Hydraulic Valves Group

Ref.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

Part No.
49883
32491
08709
77097
77097
39210
47522
1020708
1017218
1022482
1022484
1020394
1017218
1021991
39210
395973
396476
42226
44868
55586
46480
49933
69173

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Valve, Cntrl, Hyd [M20] (See Breakdowns)
Screw, Hex, M8 X 1.25 X 120, 8.8, Fl
Washer, Flat, 0.31, Std
Nut, Hex, Lock, M8 X 1.25, Nl
Fitting, Hyd, E90, Jm04/Om04
Fitting, Hyd, Str, Jm04/Om04
Fitting, Hyd, E90, Jm04/Om04
Fitting, Hyd, E90, Jf04/Jm04
Fitting, Hyd, E45, Jm06/Om06
Bracket, Mtg, Valve, Hyd, Swp
Screw, Hex, M8 X 1.25 X 20, Ss
Washer, Flat, 0.32b 1.00d .12, Ss
Tube, Hyd, Swp
Tube, Hyd, Swp
Valve, Cntrl, Hyd (See Breakdowns)
Screw, Hex, M8 X 1.25 X 20, Ss
Washer, Flat, 0.32b 1.00d .12, Ss
Bracket, Mtg, Valve, Hyd, Scb
Fitting, Hyd, E90, Jf04/Jm04
Fitting, Hyd, Str, Om04/Qm04
Fitting, Hyd, E90, Om04/Qm04
Fitting, Hyd, Str, Jf04/Qm04
Fitting, Hyd, E45, Jm08/Om08
Fitting, Hyd, E90, Jm08/Om08
Fitting, Hyd, Str, Jm04/Om04
Fitting, Hyd, E90, Jm06/Om06
Fitting, Hyd, Str, Jm10/Om10
Fitting, Hyd, Tee, Jm08/Jm08/Om08, Br
Fitting, Hyd, E90, Jm08/Om08, L
Fitting, Hyd, Tee, Jm06/Jm06/Om06, Run

Qty.
1
2
2
2
2
2
2
1
2
1
2
2
1
1
1
6
6
1
1
1
1
1
1
1
1
3
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

143

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 16 of 19)

Side Brush Hydraulic Valve Group
G13
6
4

1
3

8
C6

20
G7

10
16

M2
9

7
11

3
P4

P3
5
12

T4
2

14
19

18
144

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 17 of 19)

Side Brush Hydraulic Valve Group

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

Part No.
56690
55685
34359
44868
1026119
55586
39210
396476
42226
56820
1025405
1025834
08709
09010
32491
08713

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)
)

Description
Valve, Cntrl, Hyd [M20 And T20] (See Breakdown)
Fitting, Hyd, Str, Jm06/Om06
Fitting, Hyd, Str, Jm04/Om06
Fitting, Hyd, E45, Jm04/Om04
Fitting, Hyd, E90, Jm08/Om08
Fitting, Hyd, Str, Om04/Qm04
Valve, Hyd, Check, Jm08/Om08 5000psi
Fitting, Hyd, Str, Jm04/Om04
Fitting, Hyd, E90, Jf04/Jm04
Fitting, Hyd, Str, Jf04/Qm04
Fitting, Hyd, Str, Jm08/Om08
Fitting, Hyd, E45, Jm08/Om08
Fitting, Hyd, E90, Jm06/Om06
Tube, Hyd, 08 Jf08/Jf08
Bracket, Valve, Sba [M20 And T20]
Screw, Hex, M8 X 1.25 X 100, 8.8
Nut, Hex, Lock, M8 X 1.25, Nl
Screw, Hex, M8 X 1.25 X 25, Ss
Washer, Flat, 0.31, Std
Nut, Hex, Lock, M8 X 1.25, Nl, Ss
Fitting, Hyd, Cap, Jf08

Qty.
1
2
2
1
1
1
1
1
1
1
1
1
1
1
1
2
2
2
2
2
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

145

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 18 of 19)

Side Brush Hydraulic Hose Group

7
2
9
1

3
C6

M2
C7

C5
5

P4
T4
P3
4

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
146

M20 331385 (02-2007)

M20 Hydraulic Hose, Pump & Valve Drawings
(Page 19 of 19)

Side Brush Hydraulic Hose Group

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

Part No.
1023485
1025990
1023486
1025991
1025445
365004
56690

Serial Number
(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000-(000000--

)
)
)
)
)
)
)
)
)
)

Description
Hose, Hyd, Med06, Jf06e90l/Jf06str,038.0
Hose, Hyd, Tc06, Jf06str/Jf06str, 033.0
Hose, Hyd, Tc04, Jf04str /Jf04str, 39.0
Hose, Hyd, Tc08, Jf08e90/Jf08str, 034.0
Hose, Hyd, Tc06, Jf06str /Jf06str, 23.0
Hose, Hyd, Tc04, Jf04str /Jf04str, 20.0
Hose, Hyd, Tc06, Jf06str /Jf06e90, 74.0
Hose, Hyd, Tc08, Jf08e90/Jf08str, 056.0
Fitting, Hyd, Str, Jm06/Om06
Fitting, Hyd, Tee, Jm06/Jm06/Om06, Run

Qty.
1
1
1
2
1
1
1
1
1
1

NOTE: Refer to the current Operators or Parts Manual for the most up-to-date information
M20 331385 (02-2007)

147

M20 Hydraulic Solenoid Valve Details

SV1

SV3

SV4

SV6

SV2
*PWM*

SV7

SV8

SV9

SV10
*PWM*

H
SV13
SV11

SV12

SV15

SV14

148

M20 331385 (02-2007)

M20 General Information
(Page 1 of 2)

Commonly Used Hydraulic Symbols

Lines Connected
Together

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

Lines Not
Connected
Together

Information

Warning!

Hydraulic
Cylinder

Hydraulic
Solenoid Valve

Quick Connect
Test Port

Restrictor or
Orifice

Component
is Rotating

Hydraulic
Flow

No Connection

Oil Tank or
Reservoir

EXAMPLES

Check
Valve

Pilot Port
Check Valve

Oil Cooler or
Heat Exchanger

Component
is Energized

Variable
or PWM

Spring Loaded
Check Valve

Oil Filter
With Bypass

Non-Energized
Coils

Energized
Coils
Arrow indicates a
PWM (Pulse Width
Modulated) valve

Hydraulic
Motor

Hydraulic
Pump

Pressure
Reducing Valve

Relief Valve

Assembly

SV14

SV7

SV19

B
SV25

Indicates Energized Solenoid Valve Coil

M20 331385 (02-2007)

Circled envelope is
valve position for indicated
hydraulic circuit

149

M20 General Information
(Page 2 of 2)

M20 Hydraulic Pump Flow Rates (typical)
PROPEL
PUMP
ACCESSORY PUMPS

ENGINE @
2400 RPM

12.5 GPM
(47.3 LPM)
maximum

10 GPM
6 GPM
4 GPM
(37.9 LPM) (22.7 LPM) (15.1 LPM)
PUMP
1

PUMP
2

PUMP
3

Commonly Used Abbreviations

AUX
CIR
CK
CM
CONV
CU
CV
CYL
DC
DC
E
FLTR
GPM
HTX
IN
LH
LPM
LS
M

Auxiliary
Cubic Inch Dis placem ent per Revolution
Check Valve
Centim eters
Conveyor
Cubic
Control Valve
Cylinder
Dis connect Coupler (Hydraulic)
Direct Current (Electrical)
Engine (Com bus tion)
Filter
Gallons Per Minute
Heat Exchanger
Inches
Left Hand
Liters Per Minute
Load Sens e
Motor (Com bus tion)

MFLD
MTR
OR
PC
PMP
PR
PSI
PTO
PWM
RES
RH
RPM
RV
SC
STRN
SV
SW
TV
V

Manifold
Motor (Hydraulic)
Orifice
Pilot Port Check Valve
Pum p
Pres s ure Relief Valve
Pounds Per Square Inch
Power Take Off
Puls e Width Modulation
Res ervoir
Right Hand
Revolutions Per Minute
Relief Valve
Spring Loaded Check Valve
Strainer
Solenoid Valve
Switch
Throttle Valve
Volts

Typical Hydraulic Manifold Port Markings
C
G
LS

150

Hydraulic Cylinder Connection
Test Port
Load Sense Port

M
P
R or T

Hydraulic Motor Connection
Pump Connection
Return Port (To Tank)

M20 331385 (02-2007)

Side Brush

Extend

G13

Down

Retract

Side Brush
Run
(Sweep/Scrub)

Run

Sweep Fan

Run

Down

Scrub Fan

Hopper Lift

G11

Closed

Open

Down

Test Port

Down

Function

Main Brushes Run

Hopper Door

Squeegees,
Side and Rear

Scrub Head

Component /
System

Side
Valve
SV7

Scrub
Valve

SV7

Enable
Coil

Scrub
Valve

Sweep
Valve

Scrub
Valve

Sweep
Valve

Scrub
Valve

Test Port
Location

SV12

default

SV10, SV11

default

SV8

SV9

SV1

SV14

SV13

SV6

SV15

default

SV4

default

SV2, SV3

Energized Coil(s)

1018938

Side Valve

SV10 is PWM controlled; Operate
Side Brush up and down using Manual
Mode; SV8 and SV11 tied together
electrically; If main brush is ON, there
may not be enough pump pressure to
fully retract against the 400 PSI.

53485

On Sweep
Fan Motor

1018938

1020394

Scrub
Valve

Operate Side Brush "On" using Manual
Mode--Monitor pressure at G6; SV8
Side Valve
and SV11 tied together electrically

1018936

1020394

1018936

1020394

Valve Block
Number

Sweep
Valve

Scrub
Valve

Operate Main Brushes "On" using
Manual Mode--Monitor pressure at G5;
SV3 and SV6 tied together electrically
500 PSI RV3 keeps hopper pushed
tight to frame

Sweep
Valve

Lift Hopper, Operate Hopper Door
"Open and Closed" using Manual Mode-Monitor pressure at P5 and/or G11

Scrub
Valve

SV2 is PWM controlled; Down
pressure varies with current to SV2;
SV3 and SV6 tied together electrically
Operate Squeegees "Up and Down"
using Manual Mode--Monitor pressure
at G5

Valve Block

Notes

Left front

Direct to
Tank

C12

Direct to
Tank

C11

C10

Exit Port

RV1

RV2

RV3

RV2

SV2

Pressure
Control in
Circuit

PR1

RV1

SV10

PR1

RV1

M4
P3
On Sweep
(on Scrub (on Side
Fan Motor
Valve)
Valve)

Direct
from
Pump

Left Side, on
vacuum fan
frame
On sweep
fan motor

C12

C10

C11

Left Side, on
vacuum fan
frame

Left Side, on
vacuum fan
frame
C2

Feed Port

Location

400

2500

0 to 800

400

2500

1800

2500

500

2500

0 to 800

Pressure
Setting (PSI)

Operating Flow
from Pump # 1
(inner most pump)

Operating Flow
from Pump # 2
(middle pump)

Operating Flow
from Pump # 1
(inner most pump)

Notes

M20 Operating Matrix

151

Spray
Hose

(Extended Scrub)

Side Brush

option

added components

E or H component #

Side Brush ON Solenoid Valve

E,H

SV-8

Side Brush Pressure Solenoid Valve

E,H

SV-10

Side Brush Down Solenoid Valve

E,H

SV-11

Side Brush Extend Solenoid Valve

E,H

SV-12

FaST Side Brush Valve

SOL-6

Side Brush Water Valve

SOL-7

Side Brush Manifold

Side Brush Lift Cylinder

Side Brush Extend Cylinder

Side Brush Motor

Solution Tank Auto Fill Water Valve

SOL-1

Recovery Tank Auto Fill Water Valve

SOL-2

Solution Tank Full Switch

S-14

Recovery Tank Half Full Switch

S-16

Detergent Pump

ES Pump

Spray Hose Pump

Spray Hose Relay

M12

Spray Hose Switch

S-25

notes

If machine has ES option, the following
components will not be on the
machine: FaST Water Pump, FaST
Water Pump Relay (M11), FaST
Detergent Pump, FaST Air Pump,
FaST Enable Valve (SOL-4), FaST
High Flow Valve (SOL-5), FaST Side
Brush Valve (SOL-6)

E = Electrical Component
H = Hydraulic Component

152

M20 331385 (02-2007)

M20 Scrub/Sweep Head Lower
Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

Engine speed: 2400 RPM

SV7

Gray items are
energized
or activated

SCRUB MANIFOLD

Typical Default
Pressure Readings (+/- 15%)
(SCRUBBING)
Setting

Pressure at G1

44psi (3 bar)

159psi (11 bar)

240psi (16.5 bar)

RV2
Typical Default
Pressure Readings (+/- 15%)
(SWEEPING)

2500 PSI
(172.4 BAR)
Scrub
Head
Actuator

Setting

Pressure at G1

ORIFICE

5psi (0.34 bar)

0.046 in
(1.17 mm)

22psi (1.5 bar)

66psi (4.5 bar)

*PWM*

SCRUB HEAD
ACTUATOR

LOWER

SV2
G2

SV3
NOTE
SPRING
ASSIST

PC1

ENGINE

OIL
FILTER

Pressure settings P1, P2, & P3 are
the Touch Panel LED indicators
for Main Brush down pressure
OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

153

M20 Scrub/Sweep Head Lift
Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

Engine speed: 2400 RPM

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)
Scrub
Head
Actuator

ORIFICE

0.046 in
(1.17 mm)

G1
SCRUB HEAD
ACTUATOR

LIFT

SV2
SV3
NOTE
SPRING
ASSIST

PC1

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
154

M20 331385 (02-2007)

M20 Squeegees Lower
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)
ORIFICE

0.046 in
(1.17 mm)

SV4
C2

PC2
C4
LEFT
SQUEEGEE
ACTUATOR

RIGHT
SQUEEGEE
ACTUATOR

REAR
SQUEEGEE
ACTUATOR

LOWER

ORIFICE

0.031 in
(0.79 mm)

LOWER

ORIFICE

0.031 in
(0.79 mm)

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

155

M20 Squeegees Lift
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)
ORIFICE

0.046 in
(1.17 mm)

SV4

PC2
C4

LIFT

ORIFICE

0.031 in
(0.79 mm)

REAR
SQUEEGEE
ACTUATOR
LIFT

RIGHT
SQUEEGEE
ACTUATOR

LIFT

LEFT
SQUEEGEE
ACTUATOR

ORIFICE

0.031 in
(0.79 mm)

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
156

M20 331385 (02-2007)

M20 Main Brushes ON
Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

Engine speed: 2400 RPM

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

CV1

SV6

M1
REAR MAIN
BRUSH
MOTOR

ENGINE

OIL
FILTER

FRONT MAIN
BRUSH
MOTOR

Main Brush Motors speed:
420-480 RPM

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

157

M20 Side Brush ON
Engine speed: 2400 RPM

Gray items are
energized
or activated

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

RV1
2500 PSI
(172.4 BAR)

SV1

Side Brush Motor speed:
140-160 RPM

Side Brush can only be
operated when Main
Brushes are ON

SV9

SIDE BRUSH MANIFOLD

SV8

P3
SCRUB FAN
MOTOR
1800 PSI
(124 BAR)

25 PSI
(1.7 BAR)

H
SWEEP FAN
MOTOR

SIDE BRUSH
MOTOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
158

M20 331385 (02-2007)

M20 Scrub Vacuum Fan ON
Engine speed: 2400 RPM

Gray items are
energized
or activated

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

RV1
2500 PSI
(172.4 BAR)

Scrub Fan Motor speed:
10,500 RPM (+/- 150 RPM)

SV1

Scrub Fan Motor vacuum:
34-39 in/H2O (86-99 cm/H2O)
measured at squeegee

SIDE BRUSH MANIFOLD

SV9

SV8
T3

P3
SCRUB FAN
MOTOR
1800 PSI
(124 BAR)

M2
25 PSI
(1.7 BAR)

SWEEP FAN
MOTOR

SIDE BRUSH
MOTOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

159

M20 Scrub Vacuum Fan & Side Brush ON
Engine speed: 2400 RPM

Gray items are
energized
or activated

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

RV1
2500 PSI
(172.4 BAR)

T2
Scrub Fan Motor speed:
10,500 RPM (+/- 150 RPM)

i
G6

SV1

Scrub Fan Motor vacuum:
34-39 in/H2O (86-99 cm/H2O)
measured at squeegee
Side Brush Motor speed:
140-160 RPM

i
M4

Side Brush can only be operated
when Main Brushes are ON

SV9

SIDE BRUSH MANIFOLD

SV8
T3

P3
SCRUB FAN
MOTOR
1800 PSI
(124 BAR)

25 PSI
(1.7 BAR)

H
SWEEP FAN
MOTOR

SIDE BRUSH
MOTOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
160

M20 331385 (02-2007)

M20 Sweep Vacuum Fan ON
Engine speed: 2400 RPM

Gray items are
energized
or activated

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

RV1
2500 PSI
(172.4 BAR)

SV1

Sweep Fan Motor speed:
7,000 RPM (+/- 150 RPM)

Sweep Fan Motor vacuum:
20-24 in/H2O (51-61 cm/H2O)

SIDE BRUSH MANIFOLD

SV8
SV9
T3

P3
SCRUB FAN
MOTOR

1800
PSI
(124
BAR)

SWEEP FAN
MOTOR

25 PSI
(1.7 BAR)

SIDE BRUSH
MOTOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

161

M20 Sweep Vacuum Fan & Side Brush ON
Engine speed: 2400 RPM

Gray items are
energized
or activated

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

RV1
2500 PSI
(172.4 BAR)

SV1

Sweep Fan Motor speed:
7,000 RPM (+/- 150 RPM)

Sweep Fan Motor vacuum:
20-24 in/H2O (51-61 cm/H2O)

Side Brush Motor speed:
140-160 RPM
Side Brush can only be operated
when Main Brushes are ON
SIDE BRUSH MANIFOLD

SV9

SV8
T3

P3
SCRUB FAN
MOTOR
1800
PSI
(124
BAR)

H
SWEEP FAN
MOTOR

25 PSI
(1.7 BAR)

SIDE BRUSH
MOTOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
162

M20 331385 (02-2007)

M20 Hopper Lift
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

P7
P6

T5
SWEEP MANIFOLD

RV3
500 PSI
(34.5 BAR)

C12

SV13
OR1
0.030 in
(0.76 mm)

0.028 in
(0.71 mm)

SV14

PC5

LIFT

ORIFICE

HOPPER LIFT
ACTUATOR

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

163

M20 Hopper Lower
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

P7
P6

T5
SWEEP MANIFOLD

RV3
500 PSI
(34.5 BAR)

SV13

C12

LOWER

OR1
0.030 in
(0.76 mm)

PC5

SV14

ORIFICE

HOPPER LIFT

0.028 in ACTUATOR
(0.71 mm)

ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
164

M20 331385 (02-2007)

M20 Hopper Door Open
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

T5
SWEEP MANIFOLD

G11

HOPPER DOOR
ACTUATOR

SV15
OR2

0.040 in
(1.0 mm)

PC6

C11
OPEN

C10
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

165

M20 Hopper Door Close
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

T5
SWEEP MANIFOLD

G11

SV15
HOPPER DOOR
ACTUATOR
OR2

PC6

0.040 in
(1.0 mm)

C11

C10
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
166

M20 331385 (02-2007)

M20 Side Brush Lower
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

300 psi (20.7 bar)

RV2

400 psi (27.6 bar)

2500 PSI
(172.4 BAR)

500 psi (34.5 bar)

Typical Default
Pressure Readings (+/- 15%)
(SWEEPING)
Setting
Pressure at G13

ORIFICE

0.055 in
(1.4 mm)

OR3

Typical Default
Pressure Readings (+/- 15%)
(SCRUBBING)
Setting
Pressure at G13

Gray items are
energized
or activated

*PWM*

0.040 in
(1.0 mm)

SIDE BRUSH
MANIFOLD

300 psi (20.7 bar)

330 psi (22.8 bar)

430 psi (29.6 bar)

G13

SIDE BRUSH
LIFT ACTUATOR

LOWER

SV10

SV11
C8

PR1
400 PSI
(27.6 BAR)

T4
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

167

M20 Side Brush Lift
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

P7
P4
OR3

SIDE BRUSH MANIFOLD

G13

0.040 in
(1.0 mm)

SIDE BRUSH
LIFT ACTUATOR

SV11
SV10
C8

PR1

LIFT

400 PSI
(27.6 BAR)

T4
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
168

M20 331385 (02-2007)

M20 Side Brush Extend
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

P7
P4
OR3

0.040 in
(1.0 mm)

PR1

SIDE BRUSH MANIFOLD

400 PSI
(27.6 BAR)

SIDE BRUSH
EXTEND ACTUATOR

C7
EXTEND

SV12

G10

PC6 C5

T4
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
M20 331385 (02-2007)

169

M20 Side Brush Retract
Engine speed: 2400 RPM

Pressure / Flow Line
Suction Line
Return or Low Pressure Line
Active Pilot Port Line
Inactive Pilot Port Line
Case Drain Line

SCRUB MANIFOLD

SV7

Gray items are
energized
or activated

RV2
2500 PSI
(172.4 BAR)

ORIFICE

0.055 in
(1.4 mm)

P7
P4
OR3

0.040 in
(1.0 mm)

PR1

G7
SIDE BRUSH
EXTEND ACTUATOR

400 PSI

400 PSI
(27.6 BAR)

SIDE BRUSH MANIFOLD

G10

RETRACT

SV12

PC6 C5
T4
ENGINE

OIL
FILTER

OIL
COOLER

SCREEN

35 PSI
(2.4 BAR)
170

M20 331385 (02-2007)

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Manual No.
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Rev. No.

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M20 331385 (02-2007)

171

M20 331385 (02-2007)
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TENNANT COMPANY
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P.O. Box 1452
Minneapolis, MN 55440--9947

Name

Rev. No.

Publish Date
Page
- Report Error - Suggestion

Date

Customer Number
Company
Address
City/State/Zip Code

M20 331385 (02-2007)

173

M20 331385 (02-2007)
Fold along dotted lines

174
Tape here

NO POSTAGE
NECESSARY
IF MAILED
IN THE
UNITED SATES

BUSINESS REPLY MAIL
FIRST CLASS MAIL

PERMIT NO. 94

MINNEAPOLIS, MN

POSTAGE WILL BE PAID BY ADDRESSEE

TENNANT COMPANY
Technical Publications #15
701 North Lilac Drive
P.O. Box 1452
Minneapolis, MN 55440--9947

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Modified                        : 2017:03:15 08:45:28.978-05:00
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Marketing Channel               : DST, SLS, SRV, EMP, DIR, KSA, SSP
Description                     : M20 Service Information Manual (S/N 000000-007999)
Language                        : en, all
Power Source                    : Diesel, Gas, LPG
Title                           : M20 Service Manual (S/N 000000-007999)
Num Pages                       : 180
Extracted                       : 2017:03:15 08:06:59.935-05:00
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Subject                         : M20 Service Information Manual (S/N 000000-007999)

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M20 Service Manual (S/N 000000 007999) Tennant Rider Floor Sweeper Scrubber Sn 0 007999

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