Drive Belts; Mower Deck Gearbox Oil Seals; Spark Plug; Breaker Points - Walker MS Operator's Manual

Maintenance Instructions

Drive Belts

Raise the body and inspect the condition of the three
(3) drive belts after every 25 hours of operation --
engine, PTO drive, and ground drive. If the belts
show signs of cracking or deteriorating, the belts
should be replaced. Refer to REPLACING/RE-
PAIRING 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 not-
ed, the seal should be replaced and the gearbox
assembly relubricated. Refer to LUBRICATION for
Mower Deck Gearbox Lubrication in this section.

Spark Plug

Every 100 hours, remove the spark plug, inspect,
clean, and reset the gap (or replace with a new
plug). Clean spark plug with a wire brush. If the
electrodes are burned short or pitted, replace the
plug (refer to Specifications for the proper type of
replacement plug). Check the spark plug gap with
a wire-type feeler gauge and set the gap between
0.028 and 0.032 in. (0.7 and 0.8 mm). Reinstall and
tighten to 17 lb·ft (23 N·m).

Breaker Points

The Subaru engine is equipped with electronic igni-
tion. No breaker points, maintenance, or adjust-
ments are necessary with this system. Contact an
authorized Subaru engine dealer in case of ignition
failure.

Fuel Lines and Clamps

Every year, inspect the fuel line from the tank to
engine for deterioration or damage. Also, inspect
the fuel line clamps for tightness. Good preven-
tive maintenance calls for complete replacement of
fuel lines and clamps every two (2) years.

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 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 indica-
tion 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 Manual.
CHECKING/SERVICING
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