Walker MW 15 HP - Manual (Page 42)

38
Maintenance Instructions
CHECKING/SERVICING
Mower Blade Profile For Sharpening
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 main-
tained by removing an equal amount of material
from each end of the blade when 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
Look under the body and inspect the condition of the
two (2) belts every 25 hours of operation - engine
PTO drive, and ground drive belt. 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 and gaskets should
be inspected every 25 hours for evidence of oil
leaking; particularly 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 recommended 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 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 new
plugs). Clean spark plugs 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 to 0.030 in.
(0.75 mm). Reinstall and tighten to 16 ft-lb (22 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 replacement of fuel
lines and clamps every two (2) years.
30°
Do Not Grind or
Sharpen on Underside
Sharpen at
Original 30° Angle
Intersection
Wear Area
Wing
Tip
Blade Balancer