R21 Maintenance
47
Check Drive Tire Mounting Nuts
Frequency: Every 100 hours
There are four (4) mounting nuts on each drive
tire. Check the mounting nuts to ensure they re-
main secure. They should each be torqued to 75
to 85 lb·ft (102 to 115 N·m).
Check Blade Brake Function
Frequency: Every 100 hours
WARNING
It is important to check and maintain blade
brake action for safe operation of the machine.
This mower is designed with a blade brake that
should stop all rotation within ve (5) seconds of
disengaging the clutch. This is a safety feature
that should be checked to conrm it is working
properly.
1. With the operator seated and the engine run-
ning, engage the blade clutch (PTO).
2. Operate the engine at full throttle and then
disengage the blade clutch. Listening for the
blades to stop moving, measure how long it
takes.
□ If the brake is working properly, all rotation
will stop ve (5) seconds after disengage-
ment of the clutch.
□ If the brake system malfunctions [the
blades do not stop within ve (5) sec-
onds], the brake needs to be repaired
or replaced before operating the mower.
Contact your local Walker Dealer.
Replace Spark Plugs and Set Gap
Frequency: Every 500 hours
NOTE: If you are not experienced with engine
maintenance or comfortable performing the steps
outlined below, contact your Walker Dealer for as-
sistance.
1. With the engine turned off and the ignition key
removed, use compressed air to clean the
areas around the base of the spark plug and
the spark plug covers to keep dirt and debris
out of the engine. There are access holes
in the chassis for the spark plugs. See “Rear
View and Left Side View” on page 8 for
location.
2. Remove the spark plugs. Replace the spark
plugs with Champion® type RC12YC (or
equivalent).
3. Check the gap for each plug using a wire
-type feeler gauge, and set the gap at 0.030
in.(0.76 mm).
4. Reinstall each plug and torque to 20 lb·ft (27
N·m).
Check/Adjust Engine Valve Lash
Frequency: Every 500 hours
This maintenance must be performed by an autho-
rized Kohler Dealer. Contact your Walker Dealer
for assistance (if they are a Kohler Dealer) or to
help you locate a Kohler Dealer in your area.
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