Owner`s manual

55
Maintenance Instructions CHECKING/SERVICING
Drive Belts
Raise the body and inspect the condition of the
three (3) drive belts after every 25 hours of opera-
tion -- engine/PTO drive and ground 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 100 hours, remove the spark plugs, 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 Specications 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 ft-lb (23.0 N·m). Both spark plugs
should be replaced yearly.
Breaker Points - Model MBV
The Briggs & Stratton engine is equipped with elec-
tronic ignition. No breaker points, maintenance, or
adjustments are necessary with this system. Con-
tact an authorized Briggs & Stratton 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 by en-
gaging the blade clutch (PTO), operating the engine
at full throttle, then disengaging the clutch and mea-
suring how quickly the blades stop. Watch the rota-
tion of the blade drive shaft as a visual indication that
movement has stopped. If the brake is working
properly, all rotation will stop ve (5) seconds
after disengagement of the clutch. If the brake sys-
tem malfunctions - blades do not stop in ve (5) sec-
onds - adjust or repair the brake before operating
the mower. Contact your Walker dealer for this ser-
vice or refer to the Walker Service Manual.
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.
Engine Starter - Model MBK
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.