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Maintenance Instructions CHECKING/SERVICING
Mower Deck Gearbox Oil Seals
The mower deck gearbox seals should be inspected
every 25 hours for evidence of oil leaking; particu-
larly the lower oil seal on the blade drive gear-
box. This seal is protected by the trash guard on the
blade hub and seal protector plate on the housing,
but is still vulnerable to seal damage due to operat-
ing in an adverse environment. The mower blade
must be removed for inspection of the seal, so it is
recommended to inspect the gearbox seals when
blades are removed for sharpening. If an oil leak
is noted, the seal should be replaced and the gear-
box assembly relubricated. Refer to Mower Deck
Gearbox Lubrication in this section.
Spark Plugs
Every 200 hours of operation, remove the spark
plugs, inspect, clean, and reset the gap (or replace
with new plugs). Before removing the spark plugs,
clean the area around the base of the plugs to keep
dirt and debris out of the engine. Clean spark plugs
with a wire brush. DO NOT use an abrasive grit type
cleaner. If the electrodes are burned short or pitted,
replace plugs with Champion
type RC12YC [MT &
MTEFI (or equivalent)] or RC14YC [MTL (or equiv-
alent)]. Check spark plug gap with a wire-type feeler
gauge and set the gap at 0.030 in. (.76 mm). Rein-
stall and tighten to between 18 and 22 ft-lb (24.4 to
29.8 N
⋅m).
Ignition Wires
Good preventive maintenance calls for complete re-
placement of spark plug wires every two (2) years.
Fuel Lines and Clamps
NOTE: The MTEFI system is pressurized and
should be serviced by a Walker dealer or Authorized
Kohler engine service outlet.
Every year, inspect the fuel supply line from the tank
to engine for deterioration or damage. Also, inspect
the fuel line clamps for tightness. Good preventive
maintenance calls for complete replacement of fuel
lines and clamps every two (2) years.
Radiator Hoses and Clamps - MTL
Inspect the radiator hoses every 200 hours for de-
terioration or damage. Also check the tightness of
the hose clamps. Good preventive maintenance
calls for complete replacement of the radiator hos-
es and clamps every two (2) years.
Engine Starter
Yearly or every 500 hours disassemble and clean
the solenoid shift starter. Refer to the Kohler Service
Manual for this procedure or contact an authorized
Kohler engine dealer to perform this service.
Blade Brake Action
Check the function of the cutter blade brake (and
blower brake on GHS models) by engaging the blade
clutch (PTO), operating the engine at full throttle, then
disengaging the clutch and measuring how quickly
the blades stop. Watch the rotation of the blade drive
shaft and blower pulley as a visual indication that
movement has stopped. If the brake is working
properly, all rotation will stop five (5) seconds af-
ter disengagement of the clutch. If the brake sys-
tem malfunctions - blades do not stop in five (5)
seconds - adjust or repair the brake before operating
the mower. Refer to ADJUSTMENTS of Blade
Clutch (PTO) in this section.
PTO U-Joints
The PTO U-joints should be inspected yearly for
looseness and wear. If either is noticed, the respec-
tive shaft or tube should be replaced. A worn U-joint
can cause vibration and extensive damage to the
PTO and deck gearboxes.
WARNING
It is important to check and maintain blade
brake action for safe operation of the ma-
chine.