Walker MC (20 HP) - Manual (Page 64)

60
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 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 not-
ed, the seal should be replaced and the gearbox
assembly 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 ft-lb
(24.4 to 29.8 N·m).
Fuel Lines and Clamps
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.
Blade Brake Action
WARNING
It is important to check and maintain blade
brake action for safe operation of the ma-
chine.
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 throt-
tle, 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 indi-
cation that movement has stopped. If the brake is
working properly, all rotation will stop five (5)
seconds after disengagement of the clutch. If the
brake system malfunctions - blades do not stop in
five (5) seconds - adjust or repair the brake before
operating the mower. Contact your Walker dealer
for this service or refer to the Walker Service Manu-
al.
Safety Switch System
WARNING
It is important to check and maintain the
safety switch system for safe operation of
the machine.
There are three (3) safety interlock switches on the
tractor; Seat Switch, FSC Neutral - Park Switch, and
PTO Switch.
NOTE: There is a 1 to 1-1/2 second time delay func-
tion on the seat switch to avoid engine power inter-
ruption when driving over bumps.
If any of the following conditions occur during start-
ing or operating, a safety interlock switch may be
malfunctioning. Contact your Walker dealer for trou-
bleshooting and/or replacement.
• With an operator in the seat, the engine starts with
the Forward Speed Control (FSC) and/or the PTO
engaged.