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Maintenance Instructions CHECKING/SERVICING
6. Check blade balance by positioning the blade
horizontally on a blade balancer or use a nail
or shaft through the center hole. If either end of
the blade rotates downward, grind (remove)
metal on that end until the blade will balance.
The blade is properly balanced when neither
end drops. Balance of a blade is generally
maintained by removing an equal amount of
material from each end of the blade when
sharpening.
Blade Balancer
Blade Balanced on Magnetic
Wall-Mounted Balancer
7. Mount the blade with wing tips pointing up into
the housing. For gear driven decks reinstall
the blade, washer, lock washer, and nut. Tight-
en the nut to 60 lb·ft (81 N·m). For belt driven
decks reinstall the spacer (if applicable), blade,
washer, and bolt. Tighten the bolt to 70 lb·ft
(90 N·m).
NOTE: When reinstalling blades on GHS mod-
els, remember, the blades turn toward each
other (counter-rotate) and the RH and LH blade
cannot be switched. Check for proper blade ro-
tation before installing blades on the deck. Re-
fer to Blade Rotation for GHS Mower Deck il-
lustration shown in Clogging Checklist in
Operating Instructions for correct blade rotation.
Drive Belts
Raise the body and inspect the condition of the
four (4) belts (3 belts on SD models) every 25 hours
of operation - engine PTO drive, jackshaft drive, hy-
drostatic ground drive, and GHS blower drive. If the
belts show signs of cracking or deteriorating, the
belts should be replaced. Refer to REPLACING/
REPAIRING the Drive Belts in this section.
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 gearbox.
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 operating in
an adverse environment. The mower blade must be
removed for inspection of the seal, so it is recom-
mended to inspect the gearbox seals when blades
are removed for sharpening. If an oil leak is noted,
the seal should be replaced and the gearbox as-
sembly relubricated. Refer to LUBRICATION for
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
(or equivalent). Check spark plug gap with a wire-
type feeler gauge and set the gap at 0.030 in.
(0.76 mm). Reinstall and tighten to between 18 and
22 lb·ft (24 to 30 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 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 replace-
ment of fuel lines 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.