Exmark Commercial 21 Users Manual

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2015-02-04

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COMMERCIAL 21

For Serial Nos.
312,000,000 & Higher
Part No. 4500-927 Rev. A

WARNING
CALIFORNIA
Proposition 65 Warning
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects,
or other reproductive harm.
Important: The engine in this product is not
equipped with a spark arrester muffler. It is a
violation of California Public Resource Code
(CPRC) Section 4442 to use or operate this
engine on any forest-covered, brush-covered,
or grass-covered land as defined in CPRC 4126.
Other states or federal areas may have similar
laws.
To acquire a spark arrester for your unit, see your
Engine Service Dealer.
This spark ignition system complies with the
Canadian standard ICES-002. Ce système d’allumage
par ètincelle de vèhicule est conforme à la norme
NMB-002 du Canada.
The enclosed Engine Owner’s Manual is
supplied for information regarding The U.S.
Environmental Protection Agency (EPA) and
the California Emission Control Regulation of
emission systems, maintenance and warranty.
Keep this engine Owner’s Manual with your unit.
Should this engine Owner’s Manual become
damaged or illegible, replace immediately.
Replacements may be ordered through the
engine manufacturer.
Exmark reserves the right to make changes or
add improvements to its products at any time
without incurring any obligation to make such
changes to products manufactured previously.
Exmark, or its distributors and dealers, accept
no responsibility for variations which may be
evident in the actual specifications of its products
and the statements and descriptions contained
in this publication.

Introduction
CONGRATULATIONS on the purchase of your
Exmark Mower. This product has been carefully
designed and manufactured to give you a maximum
amount of dependability and years of trouble-free
operation.
This manual contains operating, maintenance,
adjustment, and safety instructions for your Exmark
mower.
BEFORE OPERATING YOUR MOWER,
CAREFULLY READ THIS MANUAL IN ITS
ENTIRETY.

Figure 1
1. Model and serial number location

By following the operating, maintenance, and safety
instructions, you will prolong the life of your mower,
maintain its maximum efficiency, and promote safe
operation.

Model No.
Serial No.

If additional information is needed, or should
you require trained mechanic service, contact your
authorized Exmark equipment dealer or distributor.
Exmark parts manuals are available online at
http://www.exmark.com
All Exmark equipment dealers and distributors are
kept informed of the latest methods of servicing
and are equipped to provide prompt and efficient
service in the field or at their service stations. They
carry ample stock of service parts or can secure them
promptly for you from the factory.
All Exmark parts are thoroughly tested and inspected
before leaving the factory, however, attention is
required on your part if you are to obtain the fullest
measure of satisfaction and performance.
Whenever you need service, genuine Exmark parts,
or additional information, contact an Authorized
Service Dealer or Exmark Customer Service and have
the model and serial numbers of your product ready.
Figure 1 identifies the location of the model and serial
numbers on the product. Write the numbers in the
space provided.

Contents

Cleaning Under the Cover Plate (Non-Blade
Brake Clutch Units Only)............................31
Waste Disposal ...............................................32
Storage ..................................................................33
Preparing the Fuel System...............................33
Preparing the Engine ......................................33
General Storage Information ..........................33
Removing the Lawn Mower from
Storage.......................................................33
Troubleshooting ....................................................34

Introduction ........................................................... 3
Safety ..................................................................... 5
Safety Alert Symbol ......................................... 5
Safe Operating Practices .................................. 5
Safety and Instructional Decals ....................... 9
Specifications ........................................................11
Model Numbers .............................................11
Systems ..........................................................11
Dimensions....................................................11
Product Overview .................................................12
Operation ..............................................................13
Controls .........................................................13
Pre-Start.........................................................14
Operating Instructions ...................................15
Maintenance ..........................................................21
Recommended Maintenance Schedule(s) ............21
Periodic Maintenance ........................................22
Check Engine Oil Level ..................................22
Checking the Blade Brake Clutch (Blade
Brake Clutch Only).....................................22
Check the Mower Blade ..................................22
Check for Loose Hardware .............................24
Check the Blade Brake Clutch Bail
Operation (Blade Brake Clutch Units
Only)..........................................................24
Service Air Filter (Kawasaki Units)..................25
Service Air Filter (ECXHNBBC21 and
ECXHN21 Units) ......................................25
Change Engine Oil .........................................26
Change Oil Filter (ECXKA21 and
ECXKABBC21) ........................................27
Check Condition Of Belt (Self-Propelled
Units Only) ................................................27
Check Spark Plugs ..........................................27
Emptying the Fuel Tank and Cleaning the
Fuel Filter...................................................28
Adjustments ......................................................28
Adjusting the Self-Propel Drive
(Self-Propelled Units Only).........................28
Adjusting the Blade Brake Cable (Blade
Brake Clutch Units Only)............................29
Cleaning ............................................................30
Clean Grass Build-Up Under Deck .................30
Cleaning the Discharge Tunnel and
Plug............................................................30
Cleaning Under the Belt Cover
(Self-Propelled Units Only).........................30
Cleaning the Blade Brake Clutch Shield
(Blade Brake Clutch Units Only) .................31
4

Safety

Safe Operating Practices

Safety Alert Symbol

Training
• Read the Operator’s Manual and other training
material. If the operator(s) or mechanic(s) can
not read English it is the owner’s responsibility to
explain this material to them.
• Become familiar with the safe operation of the
equipment, operator controls, and safety signs.
• All operators and mechanics should be trained.
The owner is responsible for training the users.
• Never let children or untrained people operate
or service the equipment. Local regulations may
restrict the age of the operator.
• Only adults and mature teenagers should operate
a mower, and even mature teenagers should have
adult supervision. Be sure a teenager:
1. has read and understands the Operator's
Manual and recognizes the risks involved;
2. is sufficiently mature to use caution; and
3. is of sufficient size and weight to operate
the controls comfortably and to manage the
mower without taking risks.
• The owner/user can prevent and is responsible
for accidents or injuries occurring to himself or
herself, other people or property.

This lawn mower meets or exceeds the Consumer
Product Safety Commission (CPSC) blade safety
requirements for walk-behind rotary mowers and
the B71.4 specifications of the American National
Standards Institute in effect at the time of production.
Exmark designed and tested this lawn mower to offer
reasonably safe service; however, failure to comply
with the following instructions may result in personal
injury.
This Safety Alert Symbol (Figure 2) is used both in
this manual and on the machine to identify important
safety messages which must be followed to avoid
accidents.
This symbol means: ATTENTION! BECOME
ALERT! YOUR SAFETY IS INVOLVED!

Figure 2
Safety Alert Symbol

The safety alert symbol appears above information
which alerts you to unsafe actions or situations
and will be followed by the word DANGER,
WARNING, or CAUTION.

Preparation
• Evaluate the terrain to determine what accessories
and attachments are needed to properly and
safely perform the job. Only use accessories and
attachments approved by Exmark.
• Wear appropriate clothing including safety glasses,
substantial footwear, long trousers, and hearing
protection. Do Not operate when barefoot or
when wearing open sandals. Long hair, loose
clothing or jewelry may get tangled in moving
parts.

DANGER: White lettering / Red background.
Indicates an imminently hazardous situation which, if
not avoided, Will result in death or serious injury.
WARNING: Black lettering / Orange background.
Indicates a potentially hazardous situation which, if
not avoided, Could result in death or serious injury.
CAUTION: Black lettering / Yellow background.
Indicates a potentially hazardous situation which, if
not avoided, May result in minor or moderate injury.

CAUTION

This manual uses two other words to highlight
information. Important calls attention to special
mechanical information and Note emphasizes
general information worthy of special attention.

This machine produces sound levels in excess
of 85 dBA at the operator’s ear and can cause
hearing loss through extended periods of
exposure.
Wear hearing protection when operating this
machine.
5

Safety
• Inspect the area where the equipment is to be
used and remove all rocks, toys, sticks, wires,
bones, and other foreign objects which can be
thrown by the machine and may cause personal
injury to the operator or bystanders.

DANGER
In certain conditions during fueling, static
electricity can be released causing a spark
which can ignite gasoline vapors. A fire or
explosion from gasoline can burn you and
others and cause property damage.

DANGER

• Always place gasoline containers on the
ground away from your vehicle before
filling.

In certain conditions gasoline is extremely
flammable and vapors are explosive.
A fire or explosion from gasoline can burn
you, others, and cause property damage.

• Do Not fill gasoline containers inside a
vehicle or on a truck or trailer bed because
interior carpets or plastic truck bed liners
may insulate the container and slow the
loss of any static charge.

• Fill the fuel tank outdoors on level ground,
in an open area, when the engine is cold.
Wipe up any gasoline that spills.
• Never refill the fuel tank or drain the
machine indoors or inside an enclosed
trailer.

• When practical, remove gas-powered
equipment from the truck or trailer and
refuel the equipment with its wheels on
the ground.

• Do Not fill the fuel tank completely
full. Add gasoline to the fuel tank until
the level is 1/4 to 1/2 inch (6–13 mm)
below the bottom of the filler neck. This
empty space in the tank allows gasoline
to expand.

• If this is not possible, then refuel such
equipment on a truck or trailer from a
portable container, rather than from a
gasoline dispenser nozzle.
• If a gasoline dispenser nozzle must be
used, keep the nozzle in contact with the
rim of the fuel tank or container opening
at all times until fueling is complete.

• Never smoke when handling gasoline, and
stay away from an open flame or where
gasoline fumes may be ignited by spark.
• Store gasoline in an approved container
and keep it out of the reach of children.

WARNING

• Add fuel before starting the engine. Never
remove the cap of the fuel tank or add
fuel when engine is running or when the
engine is hot.

Gasoline is harmful or fatal if swallowed.
Long-term exposure to vapors has caused
cancer in laboratory animals. Failure to use
caution may cause serious injury or illness.

• If fuel is spilled, Do Not attempt to start
the engine. Move away from the area of
the spill and avoid creating any source of
ignition until fuel vapors have dissipated.

• Avoid prolonged breathing of vapors.
• Keep face away from nozzle and gas
tank/container opening.

• Do Not operate without entire exhaust
system in place and in proper working
condition.

• Keep away from eyes and skin.
• Never siphon by mouth.
• Check that the operator's presence controls,
safety switches, and shields are attached and
functioning properly. Do Not operate unless they
are functioning properly.

Safety
Operation

• Park the machine on level ground. Stop engine,
wait for all moving parts to stop, and remove the
spark plug wire(s).

WARNING
Operating engine parts, especially the muffler,
become extremely hot. Severe burns can occur
on contact and debris, such as leaves, grass,
brush, etc. can catch fire.
• Allow engine parts, especially the muffler, to
cool before touching.
• Remove accumulated debris from muffler and
engine area.
• Install and maintain in working order a
spark arrester before using equipment
on forest-covered, grass-covered, or
brush-covered unimproved land.

– Before checking, cleaning or working on the
mower.
– After striking a foreign object or abnormal
vibration occurs (inspect the mower for
damage and make repairs before restarting
and operating the mower).
– Before clearing blockages.
– Whenever you leave the mower.
• Stop engine, wait for all moving parts to stop:
– Before refueling.
– Before dumping the grass catcher.
– Before making height adjustments.

WARNING
Engine exhaust contains carbon monoxide,
which is an odorless deadly poison that can kill
you.

WARNING
Hands, feet, hair, clothing, or accessories can
become entangled in rotating parts. Contact
with the rotating parts can cause traumatic
amputation or severe lacerations.

Do Not run engine indoors or in a small confined
area where dangerous carbon monoxide fumes
can collect.

• Do Not operate the machine without
guards, shields, and safety devices in place
and working properly.

• Operate only in daylight or good artificial light,
keeping away from holes and hidden hazards.
• Start the engine carefully according to instructions
with feet well away from the blade.
• Never raise deck with blade running.
• Never operate the mower with damaged guards,
shields, or covers. Always have safety shields,
guards, switches and other devices in place and in
proper working condition.
• Never mow with the discharge door raised,
removed or altered unless there is a grass
collection system or mulch kit in place and
working properly.
• Grass catcher components are subject to wear,
damage and deterioration, which could expose
moving parts or allow objects to be thrown.
Frequently check the components and replace
them with the manufacturer’s recommended parts
when necessary.
• Do Not change the engine governor setting or
overspeed the engine.
• Never attempt to make wheel height adjustments
while the engine is running.

• Keep hands, feet, hair, jewelry, or clothing
away from rotating parts.
• Keep clear of the discharge opening at all times.
• This mower was designed for one operator
only. Keep all others away from mower during
operation.
• DO NOT operate the mower when people,
especially children, or pets are in the area.
• Be alert, slow down and use caution when
making turns. Look behind and to the side before
changing directions.
• Stop the blades, slow down, and use caution
when crossing surfaces other than grass and when
transporting the mower to and from the area to
be mowed.
• Be aware of the mower discharge path and direct
discharge away from others.
• Do Not operate the mower under the influence
of alcohol or drugs.
7

Safety
• Keep engine and engine area free from
accumulation of grass, leaves, excessive grease
or oil, and other debris which can accumulate
in these areas. These materials can become
combustible and may result in a fire.

• Use extreme care when loading or unloading the
machine into a trailer or truck.
• Use care when approaching blind corners, shrubs,
trees, or other objects that may obscure vision.

• Let engine cool before storing and Do Not store
near flame or any enclosed area where open pilot
lights or heat appliances are present.

Slope Operation
Use Extreme caution when mowing and/or turning
on slopes as loss of traction and/or tip-over could
occur. The operator is responsible for safe operation
on slopes.

• Shut off fuel while storing or transporting. Do
Not store fuel near flames or drain indoors.
• Park machine on level ground. Never allow
untrained personnel to service machine.

DANGER
Operating on wet grass or steep slopes can
cause sliding and loss of control. Loss of control
and/or loss of operator's footing could result in a
fall with an arm or leg getting under the mower
or engine deck which may result in serious injury,
death or drowning.

• Remove spark plug wire before making any
repairs.

• Mow across slopes, never up and down.

• Keep hands and feet away from moving parts.
If possible, Do Not make adjustments with the
engine running.

• Use care when checking blades. Wrap the blade(s)
or wear gloves, and use caution when servicing
them. Only replace damaged blades. Never
straighten or weld them.

• Do Not mow slopes when grass is wet.
• Do Not mow near drop-offs or near water.
• Do Not mow excessively steep slopes.

• Keep all guards, shields and all safety devices in
place and in safe working condition.

• Reduce speed and use extreme caution on
slopes.

• Check all bolts frequently to maintain proper
tightness.

• Avoid sudden turns or rapid speed changes.

• Frequently check for worn or deteriorating
components that could create a hazard.

• When feasible, avoid operating the equipment in
wet grass.

WARNING

• Progressively greater care is needed as the slope
increases.

Removing standard original equipment parts
and accessories may alter the warranty, traction,
and safety of the machine. Failure to use original
Exmark parts could cause serious injury or
death. Making unauthorized changes to the
engine, fuel or venting system, may violate EPA
and CARB regulations.

• Remove or mark obstacles such as rocks, tree
limbs, etc. from the mowing area. Tall grass can
hide obstacles.
• Watch for ditches, holes, rocks, dips and rises that
change the operating angle, as rough terrain could
overturn the machine.

Replace all parts including, but not limited to,
tires, belts, blades, and fuel system components
with original Exmark parts.

• Use extreme care with grass catchers or
attachments. These can change the stability of the
machine and cause loss of control.

Maintenance and Storage
• Stop the engine and remove the spark plug
wire(s). Wait for all movement to stop before
adjusting, cleaning or repairing.
8

Safety

Safety and Instructional Decals
• New safety signs may be obtained from
your authorized Exmark equipment dealer or
distributor or from Exmark Mfg. Co. Inc.

• Keep all safety signs legible. Remove all grease,
dirt and debris from safety signs and instructional
labels.
• Replace all worn, damaged, or missing safety
signs.
• When replacement components are installed, be
sure that current safety signs are affixed to the
replaced components.
• If an attachment or accessory has been installed,
make sure current safety signs are visible.

• Safety signs may be affixed by peeling off the
backing to expose the adhesive surface. Apply
only to a clean, dry surface. Smooth to remove
any air bubbles.
• Familiarize yourself with the following safety signs
and instruction labels. They are critical to the safe
operation of your Exmark commercial mower.

68-7410

103-6327
ECXHN21
1. Choke–on
2. Throttle–fast
3. Continuous variable setting

94-8072

4. Throttle–slow

109-8191
ECXKABBC21, ECXKA21

Safety

109-9317

116-1922

117–2718

116-2737

Specifications

Specifications
Model Numbers
Serial Nos: 312,000,000 and Higher
ECSKAP21; ECSKA21; ECXKA21; ECXHN21; ECXKABBC21; ECXHNBBC21

Systems

Safety Interlock System

• Engine Specifications: See your Engine Owner’s
Manual

For units without a Blade Brake Clutch: Operator
must have the blade control bail depressed to start
the engine. Releasing the blade control bail will cause
the engine to stop.

• Engine Oil Type: Exmark 4–Cycle Premium
Engine Oil

Transmission (Self Propelled Units)

• RPM: 3300 RPM (No Load)

Variable

Fuel System

Speed Range: 0–4.2 mph (6.8 km/hr)

• Capacity:

Cutting Deck

Engine

ECSKA21 and ECSKAP21 Units:
2.0 qt (1.9 L)

• Cutting Width: 21 inches (53.3 cm)
• Blade Brake: When the blade engagement control
is moved to the disengaged position a friction
brake pad stops the rotation of the blades.

All other units: 4.0 qt (3.8 L)
• Fuel Recommendations:
– For best results, use only clean, fresh, unleaded
gasoline with an octane rating of 87 or higher
((R+M)/2 rating method).

• Blade Size: (1 ea.): 20.88 inches (53.0 cm)
• Deck: 21 inches rigid. Deck design allows for
bagging, mulching or rear discharge.

– Oxygenated fuel with up to 10% ethanol or
15% MTBE by volume is acceptable.

• Cutting Height Adjustment:
Adjusts from 1 inch (2.5 cm) to 4 1/2 inches (11.4
cm) in 1/2 inch (1.3 cm) increments.

– Do Not use ethanol blends of gasoline (such
as E15 or E85) with more than 10% ethanol
by volume. Performance problems and/or
engine damage may result which may not be
covered under warranty.

• Mulching Kit: Standard on ECXKA21;
ECXHN21; ECXKABBC21, and
ECXHNBBC21 Units

– Do Not use gasoline containing methanol.

Dimensions

– Do Not store fuel either in the fuel tank or
fuel containers over the winter unless a fuel
stabilizer is used.

Curb Weight:

– Do Not add oil to gasoline.

98-122 lb (44-55 kg) Weights may vary slightly
depending on engine option.

• Fuel Filter: Non-replaceable, in tank
• Fuel Shut-Off Valve:

Overall Width:

ECSKA21 and ECSKAP21 Units Do Not have a
shut-off valve.

22 inches (55.9 cm)

All other units have a shut-off valve.
11

Product Overview
Overall Length and Height at
2 1/2 inch Cutting Height:
Handle Setting

Length

Height

High

61.00 inches
(154.9 cm)

39.00 inches (99.1
cm)

Medium

63.00 inches
(160.0 cm)

37.50 inches (95.3
cm)

Low

64.50 inches
(163.8 cm)

35.00 inches (88.9
cm)

Product Overview

Figure 3
1. Grass bag

5. Discharge door

2. Handle

6. Rear wheel height
adjustment

3. Drive Bail
(Self-Propelled Units
Only)

7. Front wheel height
adjuster

4. Blade Control Bail

Operation

is depressed toward the handle. When this bail is
released the unit will stop moving.

Note: Determine the left and right sides of the
machine from the normal operating position.

Throttle-Choke Lever (ECXHN21)
Located on the left side of the handle bar.

Controls

The lever is used to control engine speed. Moving
the throttle to the full forward (Choke) position will
place the lever in the choke position. The choke aids
in starting a cold engine. Moving the throttle control
forward will increase engine speed and moving it to
the rear will decrease engine speed.

Blade Control Bail
Located on the upper handle as shown in Figure 4.
When the blade control bail is depressed, the system
senses that the operator is in the normal operator's
position.

Choke Control (ECXHNBBC21)

• For Units with a Blade Brake Clutch: When
the blade control bail is released, the system
senses that the operator has moved from the
normal operating position and will stop the blade.

Located on the front left side of the engine as shown
in Figure 9.
The choke aids in starting a cold engine. Pulling
outward will place the control in the choke position.
Pushing the control inward shuts off the choke.

• For Units without a Blade Brake Clutch:
When the blade control bail is released, the system
senses that the operator has moved from the
normal operating position and will kill the engine.

Blade Control Lock Lever (Blade
Brake Clutch Units Only)
The blade control lock lever is located on the right
side of the handle next to the Blade Control Bail as
shown in Figure 4.
Moving the blade control lock lever into the full
forward position releases the blade control bail.
Squeezing the blade control bail against the handle
engages the blade. Releasing the blade control bail
automatically disengages the blade. The blade control
lock lever will reset to lock the blade control bail.

Figure 4
Blade Brake Unit Shown

Engine Stop Switch
Located on the left side of the engine in front of the
fuel tank as shown in Figure 5. The engine stop switch
is used on ECXHNBBC21 and ECXKABBC21 (see
Figure 9 and Figure 10 ).

1. Blade control lock lever (Blade Brake Units Only)
2. Blade control bail
3. Handle
4. Drive bail (Self-Propelled Units Only)

Press the switch to “STOP” to kill the engine. Press
“|” before starting the engine.

Self-Propel Drive Bail (Self-Propelled
Units Only)
Located on the upper handle as shown in Figure 4.
When the self-propel drive bail is squeezed, the
unit will move forward based on how far the bail
13

Operation

Figure 7
1. Rotate clockwise to close
2. Rotate counterclockwise to open

On ECXHN21 and ECXHNBBC21 units, the fuel
shut off valve is located on the engine as shown in
Figure 8. Rotate 1/4 turn clockwise to shut off fuel.
Rotate the valve 1/4 turn counterclockwise to turn
on fuel.

Figure 5
Clear plastic cover removed for clarity
1. Engine stop switch
2. Press “STOP” to kill engine
3. Press “I” before starting engine

Fuel Shut-Off Valve
The fuel shut off valve is located between the
carburetor and the fuel tank. The fuel shut off valve
shuts off the flow of fuel when the machine will
not be used for a few days, when parking inside a
building, and during transport to and from the job.
Figure 8
1. Fuel valve

Pre-Start
Fill fuel tanks. See Fuel Recommendations in
the Specifications section for additional gasoline
information.
Do Not add oil to gasoline.

Figure 6
Kawasaki Unit

Do Not overfill fuel tank. Fill the fuel tank to the
bottom of the filler neck. The empty space in the
tank allows gasoline to expand. Overfilling may result
in fuel leakage or damage to the engine or emission
system.

1. Fuel valve

On ECXKA21 and ECXKABBC21 units, rotate the
valve 1/4 turn clockwise to shut off fuel. Rotate the
valve 1/4 turn counterclockwise to turn on fuel.

Make sure you understand the controls, their
locations, their functions, and their safety
requirements.
Refer to the Maintenance section and perform all the
necessary inspection and maintenance steps.

Operation

Operating Instructions
Handle Adjustment
The height of the handle can be adjusted for
comfortable operation. Stand behind the handle to
determine the height. To adjust the handle height,
position the hardware into one of the three holes in
the handle bracket.

Open the Fuel Shut-Off Valve
Rotate the valve 1/4 turn counterclockwise to turn
the fuel on (if equipped).

Figure 10
Kawasaki units with large fuel tank shown

Starting the Engine

1. Muffler
2. Oil fill/dipstick

1. Connect the wire to the spark plug.

3. Recoil starter handle (located on handle bar for zone
start units)
4. Fuel tank cap (fuel tank varies)
5. Engine stop switch (if equipped)
6. Oil filter (if equipped)
7. Air cleaner
8. Primer bulb
9. Spark plug

2. Open the fuel valve.
3. For ECXKABBC21 Units: Turn the engine stop
switch to “|” (see Figure 5).
4. For Kawasaki Units: Press the primer bulb two
times (see Figure 11).

Figure 9
Honda unit
1. Muffler
2. Oil fill/dipstick
3. Fuel tank cap
4. Recoil starter handle (located on handle bar for zone
start units)
5. Engine stop switch (if equipped)
6. Air filter
7. Choke (BBC only)
Throttle/Choke (located on handle bar for zone
start units)

Figure 11

8. Spark plug

For ECXHNBBC21 Units: Turn the engine
stop switch to “|” and pull outward on the choke
control.
For ECXHN21 Units: Move the choke/throttle
control forward to the choke position.
Note: Do Not use the choke when the engine
is warmed up.
15

Operation
5. For units without a Blade Brake Clutch: Hold
the blade control bail to the handle.
6. Pull the starter handle lightly until you feel
resistance, then pull it sharply. Allow the rope to
return slowly.
7. For ECXHNBBC21 Units: Gradually push in
the choke control as the engine warms up.
8. For ECXHN21 Units: When the engine starts,
move the choke/throttle control back to the fast
position.

self-propels at the maximum ground speed.
Release the drive bail to stop moving when you
use the lawn mower for trimming or whenever
you leave the lawn mower.
3. To disengage the self-propel drive, release the
drive bail.
Note: The mower comes with freewheeling
clutches which make it easier to pull the mower
rearward. To disengage the clutches, you may
need to push the mower forward one inch (2.5
cm) or more after you release the self-propel drive
bail.

Stopping the Engine
1. Bring the unit to a full stop.
• For units without a Blade Brake Clutch:
Release the blade control bail. Both the
engine and the blade should stop within three
seconds.
• For units with a Blade Brake Clutch: Press
the switch to “STOP” to kill the engine (see
Figure 5).

Operating the Blade Control Bail
(Units Without Blade Brake Clutch)
1. Squeeze the blade control bail against the handle.
2. Start the engine.
3. When the blade control bail is squeezed against
the handle, the blade should engage.
4. Release the blade control bail. Both the engine
and the blade should stop.

Note: If the blade does not stop within 3 seconds
after releasing the blade control bail, contact an
Authorized Service Dealer.
2. Close the fuel shut-off valve, if equipped, when
the machine will not be in use for a few days,
when transporting, or when the unit is parked
inside a building.

Operating the Blade Control Lever
(Blade Brake Clutch Units Only)
1. Start the engine.
2. Push and hold the blade control lock lever forward
to release the blade control bail (Figure 12).

Operating the Self-Propel Drive
(Self-Propelled Units Only)
The lawn mower is variable speed, the more you
squeeze the drive bail the faster the machine travels.
1. Start the engine.
2. Squeeze the drive bail against the handle (see
Figure 4).

Figure 12

Note: You can vary the ground speed by
increasing or decreasing the distance between
the ground speed control bail and the handle.
Lower the control bail to decrease the ground
speed when you are making a turn or if the lawn
mower is moving too fast for you. If you lower
the control bail too far the lawn mower stops
self-propelling. Squeeze the ground speed control
bail closer to the handle to increase the ground
speed. When you hold the ground speed control
bail tight against the handle, the lawn mower

1. Blade control lock lever
2. Locked position

4. Push forward
5. Unlocked position

3. Blade control bail

6. Squeeze against handle

3. Squeeze the blade control bail against the handle
and release the blade control lock lever; the blade
should engage.
4. Release the blade control bail to disengage the
blade. The blade control lock lever will reset to
lock the blade control bail.
16

Operation
Using the Mulch Plug

1. Stop the engine and wait for all moving parts to
stop.

Occasionally you may wish to use the mulch plug to
mulch the grass and leaf clippings back into the lawn.

2. Move the lawn mower onto a paved surface in
a non-windy area.

• Installing the Mulch Plug:

3. Set all four wheels to the 2 1/2 inches (6.4 cm)
cutting height (see Figure 15 and Figure 16)

1. Stop the engine and wait for all moving parts
to stop.

4. Take a half sheet of newspaper and crumple
it into ball small enough to go under the deck
(about 3 inches or 7.6 cm in diameter) as shown
in Figure 14.

2. Remove the grass bag if it is on the mower.
3. Raise the discharge door and insert the mulch
plug into the discharge opening. The lip on
the plug will snap into the mower housing.

Figure 14
1. Crumpled newspaper

2. 5 inches (12.7 cm)

Figure 13
1. Mulch plug

3. Lip

2. Discharge door

4. Mower housing

5. Place the ball of newspaper 5 inches (12.7 cm) in
front of the lawn mower.
6. Start the engine.
7. Push the blade control lock lever forward to
release the blade control bail (Figure 4).

4. Lower the discharge door.
• Removing the Mulch Plug:

8. Squeeze the blade control bail against the handle.
blade should engage.

Note: When grass is thick and lush, clippings
may collect on and around the discharge tunnel
plug. This may make it difficult to remove the
plug. Clean the plug thoroughly after each use.

9. Release the blade control bail. You should hear a
“bang.” The blade should stop in three seconds.
The blade control lock lever should reset to lock
the blade control bail.

1. To remove the mulch plug, raise the discharge
door and pull the mulch plug out of the
discharge tunnel.

10. Immediately push the lawn mower over the
newspaper ball.

2. Lower the discharge door.

11. Stop the engine and wait for all moving parts to
stop.

Checking the Blade Brake Clutch
(Blade Brake Clutch Units Only)

12. Walk around the lawn mower to check for the
newspaper ball. If the ball did not go under the
deck, repeat steps 6 through 11.

Check the Blade Brake Clutch (BBC) system before
each use to ensure that it is operating properly.

13. Pull the lawn mower away from the newspaper.
If the newspaper ball unravels or is shredded,

Normal Test:
17

Operation
the blade has not properly stopped, resulting
in an unsafe operating condition. Contact an
Authorized Service Dealer.

WARNING
Adjusting the cutting height levers could bring
your hands into contact with a moving blade. A
moving blade can cause serious injury.

DANGER

• Stop the engine and wait for all movement to
stop before adjusting the cutting height.

If the blade brake clutch system is inoperative,
the blade will continue to rotate when you
release the blade control bail. Contact with
the blade could occur, causing serious injury.

• Do Not put your fingers under the housing
when adjusting the cutting height.

• Check the BBC operation before each use.

• Rear Wheel Adjustment:

• Never use the BBC-equipped lawn mower
with an inoperative safety system.

1. Pull the wheel height adjustment rod upward
to release the pin from the notch in the
adjustment bracket (Figure 15).

• Take your lawn mower to an Authorized
Service Dealer for repair if the safety
system fails to operate properly.

Test Using the Grass Bag
1. Install the empty grass bag on the discharge
tunnel.
2. Start the engine.
3. For units with a Blade Brake Clutch: Push the
blade control lock lever forward to release the
blade control bail (Figure 4).
4. Squeeze the blade control bail against the handle.
5. The bag should begin to inflate, indicating that
the blade is engaged and rotating.
6. Release the blade control bail. If the bag does not
immediately deflate, it indicates that the blade is
still rotating. The blade brake clutch mechanism
may be deteriorating, and, if ignored could result
in an unsafe operating condition. Have the lawn
mower inspected and serviced by an Authorized
Service Dealer.

Figure 15
1. Pull upward

4. Pin

2. Wheel height adjustment 5. Rotate to desired setting
rod
3. Adjustment bracket
6. Indicator

2. Apply downward pressure or lift the housing
to rotate the height adjustment bracket. Use
the indicator to determine the desired setting.

Adjusting the Cutting Height
The rear wheels are adjusted together with a height
adjustment rod located on the mower housing by
the left rear wheel. The front wheels are adjusted
separately by removing the front wheel shaft
assemblies, adjusting the height, and then replacing
the shaft assemblies. The cutting height can be
adjusted from 1 inch (25 mm) to 4 1/2 inches (114
mm) in 1/2 inch (12.7 mm) increments.

3. Release the wheel height adjustment rod to set
the pin securely in the desired notch.
• Front Wheel Adjustment
1. Pull up on the height adjuster and pull the
front wheel shaft assembly outward as shown
in Figure 16.

Operation

Figure 16
1. Front wheel shaft
assembly

4. Front quadrant block cut
heights

2. Pull up

5. Pull outward

3. Height adjuster

6. Shaft groove

2. Insert the front wheel shaft assembly into the
desired cut height setting in the front quadrant
block. Lower the height adjuster into the
groove on the front wheel shaft. Pull and
push the wheel shaft assembly to make sure it
has locked into place.

Figure 17
1. Bag

4. Handle bracket notch

2. Handle
3. Bag frame

5. Rear door
6. Lower

4. Once the bag is seated, lower the rear door
onto the bag.
• Mowing with the Grass Bag

Using the Grass Bag
• Installing the Grass Bag
1. Stop the engine and wait for all moving parts
to stop.

WARNING
A worn grass bag could allow small stones
and other similar debris to be thrown in the
operator’s or bystander’s direction. Thrown
objects can result serious personal injury or
death to the operator or bystanders.

2. Open the rear door.
3. Grasp the handle on the bag and set the rear
of the bag frame onto the handle bracket
notch (Figure 17).

Check the grass bag frequently. If it is
damaged, install a new Exmark replacement
bag.
Cut the grass until the bag is full.
Note: Do Not overfill the bag.
• Removing the Grass Bag
1. Stop the engine and wait for all moving parts
to stop.
2. Raise the rear discharge door and grasp the
handle on the bag.
3. Lift the bag off of the lawn mower and lower
the rear discharge door.
4. Gradually tip the bag forward to empty the
clippings.
5. To install the bag, refer to the section on
Installing the Grass Bag.
19

Operation
• Alternate the mowing direction. This helps
disperse the clippings over the lawn for even
fertilization.

DANGER
If the discharge door does not close
completely, the lawn mower could throw
objects. Thrown objects can result in
serious personal injury or death to the
operator or bystanders.

• If the finished lawn appearance is unsatisfactory,
try one or more of the following:
– Sharpen the blade.

• Never open the door to the discharge
opening when the engine is running.

– Walk at a slower pace while mowing.
– Cut the grass more frequently.

• If you cannot close the door because
the grass clippings clog the discharge
area, stop the engine and gently move
the discharge door handle back and
forth until you can close the door
completely. If you still cannot close the
door, remove the obstruction with a
stick, not your hand.

– Overlap cutting swaths instead of cutting a
full swath with each pass.
– Set the desired cutting height on the front
wheels. Set the rear wheels one to two notches
higher. For example, set the front wheels at 2
1/2 inches (64 mm) and the rear wheels at 3
inches (76 mm).

Operating Tips

Cutting Leaves

• Review the Safety section and read this manual
carefully before operating the lawn mower.

• After cutting the lawn, ensure that half of the
lawn shows through the cut leaf cover. You may
need to make more than one pass over the leaves.

• Set the engine speed to the fastest position for
the best cutting results.

• For light leaf coverage, set all the wheels at the
same cutting height setting.

• Maintain a sharp blade throughout the cutting
season. Periodically file down nicks on the blade.
Replace the blade when necessary with an original
Exmark replacement blade.

• If there are more than 5 inches (12.7 cm) of leaves
on the lawn, set the front cutting height one or
two notches higher than the rear cutting height.
This makes it easier to feed the leaves under the
lawn mower deck.

• Clean the air filter frequently. Mulching stirs up
more clippings and dust which clogs the air filter
and reduces engine performance.

• Slow down your mowing speed if the lawn mower
does not cut the leaves finely enough.

Cutting Grass

• If you mow over oak leaves, you can add lime to
the grass in the spring to reduce the acidity of the
oak leaves.

• Grass grows at different rates at different times
of the year. In the summer heat, it is best to cut
grass at the 2 1/2 inch (64 mm), 3 inch (76 mm),
or 3 1/2 inch (90 mm) cutting height settings. Cut
only about a third of the grass blade at a time. Do
Not cut below the 2 1/2 inch (64 mm) setting
unless the grass is sparse or it is late fall when
grass growth begins to slow down.
• When cutting grass over 6 inches (15 cm) tall,
first mow at the highest cutting height setting and
walk slower; then mow again at a lower setting for
the best lawn appearance. If the grass is too long
and the grass clump on top of the lawn, the lawn
mower may plug and cause the engine to stall.

Maintenance

Maintenance
Note: Determine the left and right sides of the machine from the normal operating position.

WARNING

If you leave the wire on the spark plug, someone
could accidentally start the engine. Accidental
starting of the engine could seriously injure you
or other bystanders.

Tipping the lawn mower may cause the fuel
to leak from the carburetor or the fuel tank.
Gasoline is extremely flammable, highly
explosive, and under certain conditions, can
cause personal injury or property damage.

Disconnect the wire from the spark plug before
you do any maintenance. Set the wire aside so
that it does not accidentally contact the spark
plug.

Avoid fuel spills by running the engine dry or by
removing the gasoline with a hand pump; never
siphon.

WARNING
The engine can become very hot. Touching a hot
engine can cause severe burns.
Allow the engine to cool completely before
service or making repairs around the engine area.

Recommended Maintenance Schedule(s)
Maintenance Service
Interval

Maintenance Procedure

After the first 5 hours

• Change the engine oil.

Before each use or daily

• Check the engine oil level.
• Check the stopping time of the blade brake. The blade must stop within 3 seconds of
releasing the bail; if it does not, contact an Authorized Service Dealer for repair.
• Check the mower blade and the engine mounting fasteners.
• Check for loose hardware.
• Check the Blade Brake Clutch Bail operation (Blade Brake Clutch Units Only)
• Clean the grass build-up from under the deck.
• Clean the discharge tunnel and plug.

Every 25 hours

• Clean the foam pre-cleaner (Kawasaki Units).
• Clean the cover, base, foam and paper elements (ECXHNBBC21 and ECXHN21 Units).

Every 40 hours

• Check the condition of the belt(s).

Every 50 hours

•
•
•
•
•

Every 100 hours

• Change the oil filter (ECXKA21 and ECXKABBC21 Units).
• Check the spark plugs.
• Clean the fuel filter element.

Every 250 hours

• Replace the air filter elements (ECXHNBBC21 and ECXHN21 Units). (May need more
often if they are damaged or excessively dirty.)

Change the engine oil. (May need more often under severe conditions.)
Check for leaks in the fuel systems and /or deteriorating fuel hose.
Clean under the belt cover (self-propelled units only).
Clean the blade brake clutch shield.
Clean under the cover plate (Non-BBC Units).

Maintenance
Maintenance Service
Interval
Every 300 hours
Yearly or before storage

Maintenance Procedure
• Replace the paper air filter (Kawasaki Units). (May need more often in dusty conditions.
See the Engine manual for additional information.)
• Empty the fuel tank before repairs as directed or before storage.

Periodic Maintenance
Check Engine Oil Level
Service Interval: Before each use or daily
1. Stop engine and wait for all moving parts to stop.
Make sure unit is on a level surface.
2. Check with engine cold.
3. Clean area around dipstick. Remove dipstick and
wipe oil off. Reinsert the dipstick and push it all
the way down into the tube. Do Not screw into
place. Remove the dipstick and read the oil level.
Figure 19
Kawasaki Engine
1. Dipstick

3. Add

2. Full

4. If the oil level is low, wipe off the area around the
oil fill cap, remove cap and fill to the “FULL”
mark on the dipstick. Exmark 4-Cycle Premium
Engine Oil is recommended; refer to the Engine
Owner's manual for an acceptable alternative. Do
Not overfill.

Figure 18
Honda Engine
1. Lower limit mark

3. Dipstick

Important: Do Not operate the engine with the
oil level below the “LOW” (or “ADD”) mark on
the dipstick, or over the “FULL” mark.

2. Upper limit mark

Checking the Blade Brake
Clutch (Blade Brake Clutch
Only)
Service Interval: Before each use or daily
Refer to Checking the Blade Brake Clutch in the
Operating Instructions section.

Check the Mower Blade
Service Interval: Before each use or daily
22

Maintenance
Always mow with a sharp blade. A sharp blade cuts
cleanly and without tearing or shredding the grass
blade.

DANGER

1. Stop the engine and wait for all moving parts to
stop.

A worn or damaged blade can break. A
piece of the blade could be thrown into the
operator’s or bystander’s area, resulting in
serious personal injury or death.

2. Disconnect the wire from the spark plug
(Figure 9 and Figure 10).

• Inspect the blade periodically for wear or
damage.

3. Drain the gasoline from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter section.

• Replace a worn or damaged blade.
If it is necessary to remove the blade for
replacement or sharpening, complete the
following steps:

4. Tip the lawn mower onto its right side.
5. Inspect the blade for sharpness and wear,
especially where the flat and the curved parts
meet (see Figure 20). Because sand and abrasive
material can wear away the metal that connects
the flat and curved parts of the blade, check
the blade before using the lawn mower. If you
notice a slot or wear (Figure 20B and Figure 20C),
replace the blade.

A. To remove the blade, use a block of wood to
hold the blade steady (see Figure 21). Make
sure to grasp the end of the blade using a rag
or a thickly padded glove.
• For Blade Brake Clutch Units: Remove
the blade nuts, blade support, and blade.
• For Units without a Blade Brake
Clutch: Remove the blade bolt, blade
support, and blade.

Figure 21

Figure 20
1. Sail
2. Flat

3. Wear
4. Slot

B. For Sharpening: File the top side of the
blade to maintain its original cutting angle
(Figure 22A and B) and inner cutting edge
radius (Figure 22A). The blade will remain
balanced if you remove the same amount of
material from both cutting edges.

Note: For the best performance, install a new
blade before the cutting season begins. During
the year, file down any small nicks to maintain the
cutting edge.

Maintenance

Figure 22
1. Inner cutting edge radius 2. Cutting angle

C. Check the balance of the blade by placing
the center hole of the blade over a nail or
screwdriver shank clamped horizontally in a
vise (Figure 23). If either end of the blade
rotates downward, file that end (not the
cutting edge). The blade is properly balanced
when neither end drops.
Figure 24
1. Blade Brake Clutch Units
2. Units without a Blade Brake Clutch

6. Return the lawn mower to its upright position.
7. Connect the wire to the spark plug.
Figure 23
1. Blade
2. Vise

Check for Loose Hardware

3. Screwdriver

Service Interval: Before each use or daily
1. Stop engine, wait for all moving parts to stop.

D. For Installation: Make sure to grasp the end of
the blade using a rag or a thickly padded glove.

2. Visually inspect machine for any loose hardware
or any other possible problem. Tighten hardware
or correct the problem before operating.

For Blade Brake Clutch Units: Install a sharp,
balanced Exmark blade, blade support, and
the blade nuts. The sail of the blade must
point toward the top of the lawn mower
housing for proper installation. Torque the
blade nuts to 23-27 ft-lb (31-37 N m).

Check the Blade Brake
Clutch Bail Operation (Blade
Brake Clutch Units Only)

For Units without a Blade Brake Clutch:
Install a sharp, balanced Exmark blade, blade
support, and blade bolt. The sail of the blade
must point toward the top of the lawn mower
housing for proper installation. Torque the
blade bolt to 35-45 ft-lb (47-61 N m).

Service Interval: Before each use or daily
Check the Blade Brake Clutch (BBC) bail operation
for any operation problems or deteriorating
components, such as the spring. Replace components
or correct any problems before operating. Refer to
Operating the Blade Control Lever in Operation.

Maintenance

Service Air Filter
(Kawasaki Units)
Service Interval: Every 25 hours—Clean
the foam pre-cleaner
(Kawasaki Units).
Every 300 hours—
Replace the paper air
filter (Kawasaki Units).
(May need more often in
dusty conditions. See
the Engine manual for
additional information.)
Note: Do Not operate the engine without the air
filter assembly; extreme engine damage will occur.
1. Stop engine, wait for all moving parts to stop.
2. Disconnect the wire from the spark plug
(Figure 10).
Figure 26
ECSKA21 and ECSKCP21 Units

3. Remove the cover and clean it thoroughly.

1. Cover
2. Paper air filter

3. Foam element

4. Remove the paper air filter and discard it as
required.
5.
6.
7.
8.
9.

Figure 25
ECXKA21 and ECXKABBC21 Units
1. Cover

3. Paper air filter

2. Foam element

4. Air filter base

Note: Do Not try to clean a paper air filter.
Remove the foam element and wash it with a mild
detergent and water, then blot it dry.
Saturate the element with clean engine oil, then
squeeze it (Do Not twist) to remove the excess oil.
Install the foam element.
Install the new paper air filter.
Install the cover.

Service Air Filter
(ECXHNBBC21 and
ECXHN21 Units)
Service Interval: Every 25 hours—Clean
the cover, base, foam
and paper elements
(ECXHNBBC21 and
ECXHN21 Units).
Every 250 hours— Replace
the air filter elements
25

Maintenance
(ECXHNBBC21 and
ECXHN21 Units). (May
need more often if they are
damaged or excessively
dirty.)

psi (207 kPa) through the filter from the wire
screen side to remove any excess dirt. If the paper
element is excessively dirty, replace it.
Note: Never try to brush dirt off the paper
element; brushing forces the dirt into the fibers.

Note: Do Not operate the engine without the air
cleaner assembly; extreme engine damage will occur.

9. Clean the foam element in warm, soapy water or
in a nonflammable solvent.

1. Stop the engine and wait for all moving parts to
stop.

10. Rinse and dry the foam element thoroughly.
11. Dip the foam element in clean engine oil, then
squeeze out the excess oil.

2. Disconnect the wire from the spark plug
(Figure 9).

Note: Excess oil in the foam element restricts
the air flow through the element and may reach
the paper filter and clog it.

3. Remove the two wing nuts that secure the cover
(Figure 27).

12. Wipe dirt from the base and the cover with a
moist rag.
Note: Be careful to prevent dirt and debris from
entering the air duct leading to the carburetor.
13. Install the air cleaner elements and ensure that
they are properly positioned.
14. Securely install the cover with the two wing nuts.

Change Engine Oil
Service Interval: After the first 5 hours
Every 50 hours (May need
more often under severe
conditions.)
Figure 27
1. Wing nuts

4. Foam element

2. Cover
3. Paper element

5. Base

1. Run the engine to warm the engine oil.
Note: Warm oil flows better and carries more
contaminates.

WARNING

4. Remove the cover.

Oil may be hot after engine has been run.
Contact with hot oil can cause severe personal
injury.

Note: Be careful to prevent dirt and debris from
falling into the base.
5. Remove the foam and paper elements from the
base.

Avoid contacting the hot engine oil when you
drain it.

6. Remove the foam element from the paper
element.

2. Stop engine, wait for all moving parts to stop.
3. Disconnect the wire from the spark plug.

7. Inspect the foam and paper elements, and replace
them if they are damaged or excessively dirty.

4. Drain the gasoline from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter section.

8. Tap the paper element on a hard surface several
times or use compressed air not exceeding 30
26

Maintenance
5. Place a suitable drain pan under the dipstick/oil
drain.
6. Clean around the dipstick.
7. Remove the dipstick by rotating the cap
counterclockwise and pulling it out.
8. Raise the left side of the lawn mower to drain the
oil from the dipstick fill tube into the drain pan.
9. After draining the oil, return the lawn mower to
the operating position.

Figure 28

10. Fill the crankcase with fresh oil to the upper limit
mark on the dipstick. Use oil recommended in
the Check Engine Oil Level section. Do Not
overfill

1. Gasket

8. Install the new filter and hand tighten it 2/3 turn
only.
9. Fill the crankcase as stated in Check Engine Oil
Level section. Exmark 4–Cycle Premium Engine
oil is recommended. Refer to the Engine Owner's
Manual for an acceptable alternative.
10. Connect the wire to the spark plug.
11. Run the engine for about 3 minutes.
12. Stop the engine, wait for all moving parts to stop,
and check for oil leakage around the filter.
13. Add oil to compensate for the oil in the oil filter.
14. Recycle the used oil filter according to local codes.

11. Insert the dipstick into the filler neck and rotate
the cap clockwise until it is tight.
12. Wipe up any spilled oil.
13. Connect the wire to the spark plug.
14. Recycle the used oil according to local codes.

Change Oil Filter
(ECXKA21 and
ECXKABBC21)
Service Interval: Every 100 hours

Check Condition Of Belt
(Self-Propelled Units Only)

1. Run the engine to warm the oil.
2. Stop the engine and wait for all moving parts to
stop.

Service Interval: Every 40 hours
1. Stop engine, wait for all moving parts to stop.
2. Remove the belt cover to the lawn mower housing.
3. Check the belt for cracks, frayed edges, burn
marks or any other damage.
4. Replace the damaged belt.

3. Disconnect the wire from the spark plug.
4. Drain the engine oil.
5. Place a rag under the oil filter to catch any oil that
may leak out as you remove the filter.
6. Remove the oil filter.
7. Use your finger to coat the gasket on the new
filter with clean Exmark 4–Cycle Premium Engine
oil (see Figure 28).

Check Spark Plugs
Service Interval: Every 100 hours
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug
(Figure 9 and Figure 10).
3. Clean around the spark plug.
4. Remove the spark plug from the cylinder head.
27

Maintenance

Adjustments

Note: Replace a cracked, fouled, or dirty spark
plug. Do Not clean the electrodes because grit
entering the cylinder can damage the engine.
5. Set the gap on the plug to 0.030 inch (0.76 mm)
(Figure 29).

Note: Wait for all moving parts to stop and remove
spark plug wire before servicing, cleaning, or making
any adjustments to the unit.

Adjusting the Self-Propel
Drive
(Self-Propelled Units Only)
If the lawn mower does not self-propel or has a
tendency to creep forward when the control bail
is released, adjust the drive cable nuts as shown in
Figure 31.

Figure 29
1. Side electrode

3. Air gap—0.030 inch
(0.76 mm)

DANGER

2. Center electrode
insulator

Checking the operation of the mower with the
belt cover removed will allow debris to be thrown
in the operator's or bystander's direction and can
result in serious personal injury or death.

6. Install the spark plug and the gasket seal.
7. Torque the plug to 17 ft-lb (23 N-m).
8. Connect the wire to the spark plug.

Do Not operate the unit when cover is not in
place.

Emptying the Fuel Tank and
Cleaning the Fuel Filter

1. Stop the engine and wait for all moving parts to
stop.
2. Remove the belt cover by pulling upward on the
back of the cover to unsnap the front and back
cover tabs. Remove any debris under the cover.

Service Interval: Every 100 hours
The fuel filter (screen) element is located inside the
fuel tank (if applicable).
1. Stop the engine and wait for it to cool down.
Note: Drain gasoline for a cold engine only.
2. Disconnect the wire from the spark plug
(Figure 10).
3. Close the fuel valve.
4. Disconnect the fuel line by loosening the tube
clamp at the carburetor.
5. Open the fuel valve by turning the lever to the
open position.
6. Drain the gasoline completely from the tank and
fuel line into an approved fuel container.
7. Remove the fuel tank from the mower.
8. Close the fuel valve.
9. Pour a small amount of fuel in the fuel tank, move
the fuel around in the tank, and pour it out into
an approved fuel container.
10. Install the fuel tank and fuel line.

Figure 30
1. Belt cover tabs

Maintenance
cover tabs (see Figure 30). Remove any debris
under the cover.

3. If the lawn mower does not self propel with bail
engaged, tighten the belt by turning the drive
cable nuts clockwise. To maximize belt life, Do
Not overtighten the belt.

4. Loosen the cable clamp screw until the cable
conduit slides (see Figure 32).

If the lawn mower creeps forward without the
bail engaged, loosen the belt by turning the drive
cable nuts counterclockwise.

Figure 31
1. Adjustment of drive cable nuts

Figure 32

4. Reinstall the belt cover by pushing down on the
rear first and then snapping the front onto the
mower housing.

1. Spring

3. Cable clamp screw

2. Cable conduit

5. Check the operation for desired drive control.
5. Pull the cable until there is approximately 1/8
inch in slack. Do Not put tension on the spring.

6. Repeat steps 2 through 5 as necessary for further
adjustment.

6. Tighten the screw to lock the adjustment in place.

Note: Adjustment to obtain desired ground
speed at full bail travel may be made in order to
accommodate slower speeds.

7. Reinstall the belt cover by pushing down on the
rear first and then snapping the front onto the
mower housing.

Adjusting the Blade
Brake Cable
(Blade Brake Clutch Units
Only)

8. Connect the wire to the spark plug.

Adjust whenever a new blade brake cable assembly is
installed or if the blade control lock lever does not
operate properly.

10. Perform the “Checking the Blade Brake Clutch
(Blade Brake Clutch Units Only)” procedure in
Operation.

9. Check the operation of the blade control lock
lever (see Figure 12). The lever must reset itself
to lock out the blade control bail. If it does not,
repeat steps 4 through 8.

1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug.
3. Remove the belt cover by pulling upward on the
back of the cover to unsnap the front and back

Maintenance

Cleaning

Scraping Method
If washing does not remove all debris from under the
lawn mower, scrape it clean.
1. Disconnect the wire from the spark plug.
2. Drain the fuel from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter section.
3. Tip the lawn mower onto its right side.
4. Remove the dirt and grass clippings with a
hardwood scraper. Avoid burrs and sharp edges.
5. Turn the lawn mower upright.
6. Fill the fuel tank.
7. Connect the wire to the spark plug.

Clean Grass Build-Up Under
Deck
Service Interval: Before each use or daily
1. Stop engine, wait for all moving parts to stop, and
remove spark plug wire.
2. To ensure the best performance, keep the
underside of the lawn mower housing clean.

CAUTION
The mower may dislodge material from under
the mower housing.
• Wear eye protection.
• Stay in the operating position (behind the
handle).
• Do Not allow bystanders in the area.

Cleaning the Discharge
Tunnel and Plug
Service Interval: Before each use or daily

Washing Method
1. Position the lawn mower on a flat concrete or
asphalt surface near a garden hose.
2. Start the engine.
3. Hold the running garden hose at handle level and
direct the water to flow on the ground just in
front of the right rear tire (Figure 33).

Always be sure that the discharge tunnel door closes
securely when you release the handle. If the debris
prevents the discharge door from closing securely,
clean the inside of the discharge tunnel and the door
thoroughly.

WARNING
Grass clippings and other objects can be thrown
from an open discharge tunnel. Thrown objects
can cause serious injury or kill the operator or
bystanders.
Never start or operate the lawn mower unless one
of the following is true:
• The discharge tunnel plug is locked securely
in the discharge tunnel.
• The grass bag is locked in place.
• The optional rear discharge chute is locked
in place.
• The discharge tunnel door is closed.

Figure 33

4. Engage the blade.
Note: The blade will draw in water and wash out
clippings. Let the water run until you no longer
see clippings being washed out from under the
housing.
5. Disengage the blade, stop the engine and wait for
all moving parts to stop.
6. Turn off the water.
7. Start the lawn mower, engage the blade, and let
the lawn mower run for a few minutes to dry out
its components.

Cleaning Under the Belt
Cover (Self-Propelled Units
Only)
Service Interval: Every 50 hours
1. Stop the engine and wait for all moving parts to
stop.
30

Maintenance
2. Disconnect the wire from the spark plug (see
Figure 9 and Figure 10).
3. Pull upward on the back of the cover to unsnap
the front and back cover tabs (see Figure 30).
4. Lift off the cover and brush out all the debris
around the belt area.
5. Install the belt cover by pushing down on the rear
first and then snapping the front onto the mower
housing.
6. Connect the wire to the spark plug.

7. Remove the BBC shield and brush or blow all
the debris from under the shield and around the
BBC system.
8. Install the BBC shield. Tighten the screws to
secure the BBC shield to the deck.
9. Install the blade and the two blade nuts.
10. Turn the lawn mower upright.
11. Connect the wire to the spark plug.

Cleaning Under the Cover
Plate (Non-Blade Brake
Clutch Units Only)

Cleaning the Blade
Brake Clutch Shield
(Blade Brake Clutch Units
Only)

Service Interval: Every 50 hours
1. Stop the engine and wait for all moving parts to
stop.

Service Interval: Every 50 hours
1. Stop the engine and wait for all moving parts to
stop.
2. Disconnect the wire from the spark plug (see
Figure 9 and Figure 10).
3. Drain the gasoline from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter section.
4. Tip the lawn mower onto its right side (air filter
up).
5. Remove the blade nuts and the blade (see
Figure 24).

2. Disconnect the wire from the spark plug (see
Figure 9 and Figure 10).
3. Drain the gasoline from the fuel tank. Refer to
Emptying the Fuel Tank and Cleaning the
Fuel Filter section.
4. Tip the lawn mower onto its right side (air filter
up).
5. Remove the blade bolt, blade support, and the
blade (see Figure 24).

Figure 35
1. Blade bolt

4. Cover plate

2. Blade support

5. Screw

3. Blade

Figure 34
1. Screws

6. Remove the three screws holding the cover plate
onto the unit (see Figure 35).

2. BBC Shield

7. Remove the cover plate and brush or blow all the
debris from under the plate.

6. Remove the three screws holding the BBC shield
onto the unit (see Figure 34).
31

Maintenance
8. Reinstall the cover plate and torque the screws to
35-45 ft-lb (47-61 N-m).
9. Install the blade, blade support, and the blade
bolt.
10. Turn the lawn mower upright.
11. Connect the wire to the spark plug.

Waste Disposal
Motor Oil Disposal
Engine oil and hydraulic oil are both pollutants to
the environment. Dispose of used oil at a certified
recycling center or according to your state and local
regulations.

Storage

2. Clean any dirt and chaff from the cylinder,
cylinder head fins, and blower housing.

Preparing the Fuel System

3. Remove grass clippings, dirt, and grime from the
external parts of the engine, the shrouding, and
the top of the lawn mower housing.

To prepare the lawn mower for off season storage,
perform the recommended maintenance procedures.

4. Clean the BBC shield. Refer to Cleaning the
Blade Brake Clutch Shield section in Cleaning.

Store the lawn mower in a cool, clean, dry place.
Cover the lawn mower to keep it clean and protected.

5. Check the condition of the blade. Refer
to Maintaining the Blade section in the
Maintenance.

WARNING
Gasoline can vaporize if you store it over long
periods of time. Gasoline vapors can explode if
they come into contact with an open flame.
• Do Not store gasoline over long periods of
time.
• Do Not store the lawn mower with gasoline in
the fuel tank or the carburetor in an enclosure
with an open flame. (For example, a furnace
or a water heater pilot light.)
• Allow the engine to cool before storing it in
any enclosure.

6. Service the air filter. Refer to Servicing the Air
Filter in Maintenance.
7. Tighten all nuts, bolts, and screws.
8. Touch up all rusted or chipped paint surfaces with
paint available from an Authorized Service Dealer.

Removing the Lawn Mower
from Storage
1. Check and tighten all fasteners.

Empty the fuel tank when mowing the last time
before storing the lawn mower.
1. Run the lawn mower until the engine stops from
running out of fuel.
2. Prime the engine and start it again.
3. Allow the engine to run until it stops. When you
can no longer start the engine it is sufficiently dry.

2. Remove the spark plug and spin the engine rapidly
by pulling the starter rope to blow excess oil from
the cylinder.
3. Clean the spark plug or replace it if it is cracked,
broken, or if the electrodes are worn.
4. Install the spark plug and torque it to 17 ft-lb (23
N-m).
5. Perform any needed maintenance procedures.

Preparing the Engine

6. Fill the fuel in the fuel tank with fresh gasoline.

1. While the engine is still warm, change the oil from
the crankcase. Refer to Change Engine Oil
section in Maintenance.
2. Remove the spark plug.
3. Using an oil can, add about one tablespoon of oil
to the crankcase through the spark plug hole.
4. Slowly rotate the engine several times, using the
starter rope, to distribute the oil.
5. Install the spark plug but Do Not connect the
wire to the spark plug.

7. Check the engine oil level.
8. Connect the wire to the spark plug.

General Storage Information
1. Clean the lawn mower housing. Refer to
Cleaning the Underside of the Lawn Mower
Housing section in Cleaning.
33

Troubleshooting

Troubleshooting
Important: It is essential that all operator safety mechanisms be connected and in proper operating
condition prior to mower use.
When a problem occurs, Do Not overlook the simple causes. For example: starting problems could be
caused by an empty fuel tank.
The following table lists some of the common causes of trouble. If a problem continues, contact an Authorized
Service Dealer.
Problem
Engine will not start, starts hard, or fails to
keep running.

Engine loses power.

Engine runs rough.

Lawn mower or engine vibrates excessively.

Uneven cutting pattern.

Discharge chute plugs.

Possible Cause

Corrective Action

1. Fuel tank is empty.

1. Fill the fuel tank.

2. Fuel shutoff valve is closed.
3. The throttle lever is not in the correct
position.
4. Dirt, water, or stale fuel is in the fuel
system.
5. Faulty spark plug.
6. Spark plug wire is not connected.

2. Open the fuel shutoff valve.
3. Move the throttle lever to the Choke
position.
4. Contact an Authorized Service Dealer.

1. Air cleaner is dirty.

1. Clean or replace the air cleaner element.

2.
3.
4.
5.

Oil level in the crankcase is low.
Vent hole in the fuel cap is plugged.
Dirt in fuel filter.
Dirt, water, or stale fuel is in the fuel
system.
6. The underside of the lawn mower deck
contains clippings and debris.

2.
3.
4.
5.

1. The wire is not connected to the spark
plug.

1. Connect the wire to the spark plug.

2. Faulty spark plug.
3. The throttle lever is not in the Fast
position.
4. The air filter element is dirty and is
restricting the air flow.

2. Clean, adjust or replace spark plug.
3. Move the throttle lever to the Fast
position.
4. Clean the air filter pre-cleaner and/or
replace the paper air filter.

1. The blade is bent or is out of balance.

1. Balance the blade. If the blade is bent,
replace it.

2. The blade mounting bolt is loose.
3. The underside of the lawn mower deck
contains clippings and debris.
4. The engine mounting bolts are loose.

2. Tighten the blade mounting bolt.
3. Clean the underside of the lawn mower
deck.
4. Tighten the engine mounting bolts.

5. Clean, adjust or replace spark plug.
6. Check the spark plug wire connection.

Add oil to the crankcase.
Clean or replace the fuel cap.
Replace the fuel filter.
Contact an Authorized Service Dealer.

6. Clean the underside of the lawn mower
deck.

1. All four wheels are not at the same height.

1. Place all four wheels at the same height.

2. The blade is dull.
3. Mowing in the same pattern repeatedly.
4. The underside of the lawn mower deck
contains clippings and debris.

2. Sharpen and balance the blade.
3. Change the mowing pattern.
4. Clean the underside of the lawn mower
deck.

1. The throttle lever is not in the Fast
position.

1. Move the throttle lever to the Fast
position.

2. Cutting too much grass in one pass

2. Raise the cutting height. If necessary, cut
a second time at lower cutting height.
3. Slow down.
4. Allow the grass to dry before mowing.
5. Clean the underside of the lawn mower
deck.

3. Mowing too fast.
4. The grass is wet.
5. The underside of the lawn mower deck
contains clippings and debris.

Troubleshooting
Problem
Lawn mower does not self-propel.
(Self-Propel Units Only)

Difficult to pull lawnmower rearward
(Self-Propelled Units Only).

Possible Cause

Corrective Action

1. The self-propel drive cable is out of
adjustment or is damaged.

1. Adjust the self-propel drive cable. Replace
the cable if necessary.

2. There is debris under the belt cover.

2. Clean the debris from under the belt
cover.

1. Transmission is locked.

1. Push mower forward to disengage the
transmission and then pull rearward.

Exmark Commercial Equipment
1 Year Limited Warranty
If for any reason you are dissatisfied with the Service Dealer’s
analysis or with the assistance provided, contact us at:
Exmark Customer Service Department
The Exmark Warranty Company
2101 Ashland Avenue
Beatrice, NE 68310
402-223-6375 or
service@exmark.com

Conditions and Products Covered
Exmark Mfg. Co. Inc. and its affiliate, Exmark Warranty
Company, pursuant to an agreement between them, jointly
warrant on the terms and conditions herein, that we will repair,
replace or adjust any part on these products and found by us
(in the exercise of our reasonable discretion) to be defective in
factory materials or workmanship for a period of one year.
This warranty applies to Exmark commercial equipment sold
in the U.S. or Canada. This warranty may only be assigned or
transferred to a second (or third) owner by an authorized
Exmark dealer. The warranty period commences upon the date
of the original retail purchase.
Warranty Exceptions
• Bags, Belts and Tires
• Battery
• Engine

Owner’s Responsibilities
If your product requires warranty service it must be returned
to an authorized Exmark service dealer within the warranty
period. This warranty extends only to equipment operated
under normal conditions. You must read the operator’s
manual. You must also properly service and maintain your
Exmark product as described in the operator’s manual. Such
routine maintenance, whether performed by a dealer or by
you, is at your expense.

Warranty Period
90 days
1 Year Prorated
*

* The Engine warranty is covered by the engine manufacturer.
Please refer to the engine manufacturer’s warranty statement
that is included in the literature packet.

General Conditions
The sole liability of Exmark and Exmark Warranty Company
with respect to this warranty shall be repair or replacement of
defective components as set forth herein. Neither Exmark
nor Exmark Warranty Company shall be liable for any
incidental or consequential loss or damage.

This warranty only includes the cost of parts and labor.
Items and Conditions Not Covered
This warranty does not cover the following:
• Pickup and delivery charges to and from any authorized
Exmark Service Dealer.
• Any damage or deterioration due to normal use, wear and
tear, or exposure including standard service items such as
blades, brushes, cutting teeth, tines, bushings, bearings,
chains, or sprockets.
• Cost of regular maintenance service or parts, such as filters,
fuel, lubricants, tune-up parts, and adjustments.
• Any product or part which has been altered or misused or
required replacement or repair due to normal wear,
accidents, or lack of proper maintenance.
• Any repairs necessary due to use of parts, accessories or
supplies, including gasoline, oil or lubricants, incompatible
with the equipment or other than as recommended in
the operator's manual or other operational instructions
provided by Exmark.

Such damages include but are not limited to:
• Expenses related to gasoline, oil or lubricants.
• Travel time, overtime, after hours time or other
extraordinary repair charges or charges relating to repairs or
replacements outside of normal business hours at the place
of business of the authorized Exmark Service Dealer.
• Rental of like or similar replacement equipment during the
period of any warranty, repair or replacement work.
• Any telephone or telegram charges or travel charges.
• Loss or damage to person or property other than that
covered by the terms of this warranty.
• Any claims for lost revenue, lost profit or additional cost as
a result of a claim of breach of warranty.
• Attorney's fees.
No Claim of breach of warranty shall be cause for cancellation
or rescission of the contract of sale of any Exmark mower.
All implied warranties of merchantability (that the
product is fit for ordinary use) and fitness for use (that the
product is fit for a particular purpose) are limited to the
duration of the express warranty.
Some states do not allow exclusions of incidental or
consequential damages, or limitations on how long an
implied warranty lasts, so the above exclusions and
limitations may not apply to you.

There are no other express warranties except for engine and
special emission system coverage.
All warranty work must be performed by an authorized
Exmark Service Dealer using Exmark approved replacement
parts.
Instructions for Obtaining Warranty Service
The product must be registered with original proof of purchase
by an Exmark Service Dealer before obtaining any warranty
service.

This warranty gives you specific legal rights, and you may
also have other rights which vary from state to state.

Contact any Exmark Service Dealer to arrange service at their
dealership. To locate a dealer convenient to you, access our
website at www.exmark.com. U.S. or Canada customers may
also call 402-223-6375.

G4500-426_D

Notes:

Service Record
Date:

Description of Work Done:

Service Done By:

SEE EXMARK’S COMPLETE LINE OF ACCESSORIES AND OPTIONS
MID-MOUNT RIDING ACCESSORIES AND OPTIONS
CUSTOM RIDE SEAT SUSPENSION SYSTEM

OPERATOR CONTROLLED DISCHARGE

FULL SUSPENSION SEAT

ROLL OVER PROTECTION SYSTEM (ROPS)

DECK LIFT ASSIST KIT

SUN SHADE

HITCH KIT

TRASH CONTAINER

LIGHT KIT

TURF STRIPER

12V POWER PORT

ULTRA VAC COLLECTION SYSTEM

MICRO-MULCH SYSTEM

ULTRA VAC QUICK DISPOSAL SYSTEM

OUT-FRONT RIDING ACCESSORIES AND OPTIONS
CUSTOM RIDE SEAT SUSPENSION SYSTEM

SNOW BLADE

DUAL-TAIL WHEEL

SNOWBLOWER

FLOOR PAN EXTENDER

SUN SHADE

HITCH KIT

TRASH CONTAINER

LIGHT KIT

ULTRA VAC COLLECTION SYSTEM

MICRO-MULCH SYSTEM

ULTRA VAC QUICK DISPOSAL SYSTEM

ROLL OVER PROTECTION SYSTEM (ROPS)

WEATHER CAB

WALK-BEHIND ACCESSORIES AND OPTIONS
GRASS CATCHER

TURF STRIPER

MICRO-MULCH SYSTEM

STANDON

Place Model No. and Serial No.
Label Here (Included in the Literature
Pack) or Fill in Below
Model No.

Date Purchased
Engine Model No. and Spec. No.
Engine Serial No. (E/No)

Serial No.

Part No. 4500-927 Rev. A
(402) 223-6300
Fax (402) 223-5489
Printed in the USA

www.exmark.com

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