Walker MB (18 HP) - Manual (Page 47)

Maintenance Instructions
CHECKING/SERVICING
45
Mower Blade Profile For Sharpening
Blade Balanced on Magnetic
Wall-Mounted Balancer
7. Mount the blade with wing tips pointing up into
the housing. Reinstall the blade, washer, lock
washer, and nut. Tighten the nut to 60 ft-lb
(81.3 N
· m).
Drive Belts
Raise the body and inspect the condition of the two
(2) 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/REPAIR-
ING 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 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 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 gear-
box assembly relubricated. Refer to 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
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 ft-lb (23 N
· m). Both spark plugs should be
replaced yearly.
Breaker Points
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 preventive
maintenance calls for complete replacement of fuel
lines and clamps every two (2) years.
Wing Tip
Do Not Grind or
Sharpen on Underside
30°
Sharpen at Original
30° Angle
Intersection
Wear Area
Blade Balancer