Drive Belts - Walker D21d Operator's Manual

Maintenance Instructions
DO NOT try to straighten a blade that is
bent. NEVER weld a broken or cracked
blade. ALWAYS replace with a new blade
to assure safety.
4. If the blade cutting edge is dull or nicked, it
should be sharpened.
sharpening by grasping the end of the blade us­
ing a rag or a thick, padded glove, while loosen­
ing and removing the nut, lock washer, and flat
washer that mounts the blade.
5. Grind cutting edge at the same bevel as the
original. Sharpen only the top of the cutting
edge to maintain sharpness.
NOTE: Blades can be sharpened with an elec­
tric blade sharpener, conventional electric grind­
er, or a hand file.
ALWAYS wear eye protection and gloves
when sharpening a blade.
Sharpen at
Original 30° Angle
30°
Do Not Grind or
Sharpen on Underside
Mower Blade Profile for Sharpening
WARNING
Remove blades for
CAUTION
Intersection
Wear Area
Wing
Tip
CHECKING/SERVICING
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
maintained 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. For gear driven decks reinstall
the blade, washer, lock washer, and nut. Tight-
en the nut to 60 lb·ft (81 N·m). For belt driven
decks reinstall the spacer (if applicable), blade,
washer, and bolt. Tighten the bolt to 70 lb·ft
(95 N·m).
NOTE: When reinstalling blades on GHS mod­
els, remember, the blades counter-rotate and
the LH and RH blades must not be switched.
Check for proper blade rotation before installing
blades on the deck. Refer to Blade Rotation
illustrations shown in Clogging Checklist in
Operating Instructions for correct blade rotation.

Drive Belts

Raise the body and inspect the condition of the five
(5) belts (4 belts on SD models) every 25 hours of
operation—engine PTO drive, jackshaft drive, hy­
drostatic ground drive, GHS blower drive, and en­
gine alternator belt. If the belts show signs of
cracking or deteriorating, the belts should be re-
placed. Refer to REPLACING/REPAIRING the
Drive Belts in this section.
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