Walker Mowers - Drive Belts; Spark Plugs; Ignition Wires

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Maintenance Instructions CHECKING/SERVICING
4. If the blade cutting edge is dull or nicked, it
should be sharpened. Remove blades for sharp-
ening by grasping the end of the blade using a
rag or a thick, padded glove, while loos ening and
removing the bolt and washer that mounts the
blade.
5. Grind cutting edge at the same bevel as the orig-
inal. Sharpen only the top of the cutting edge to
maintain sharpness.
NOTE: Blades can be sharpened with an electric
blade sharpener, conventional electric grinder, or
a hand le.
CAUTION
ALWAYS wear eye protection and gloves
when sharpening a blade.
Sharpen at Original
30° Angle
Intersection
Wear Area
Do Not Grind or
Sharpen on Underside
30°
Wing Tip
Mower Blade Prole 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 Balancer
Blade Balanced on Magnetic
Wall-Mounted Balancer
7. Mount the blade with wing tips pointing up into
the housing. Reinstall the blade, washer, and
bolt. Tighten the bolt to 64 lb·ft (87 N
·m).
Drive Belts
Raise the body and inspect the condition of the four
(4) drive belts after every 25 hours of operation --
engine/PTO drive (3) and ground drive (1). 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.
Spark Plugs
Every 200 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 to 0.030 in. (0.76 mm).
Reinstall and tighten to 18 lb·ft (24 N·m). Both spark
plugs should be replaced yearly.
Ignition Wires
Good preventive maintenance calls for complete re-
placement of spark plug wires every two (2) years.