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Mower blade profilefor sharpening, Blade balanced on magnetic wall-mounted balancer, Drive belts – Walker MC (20 HP) User Manual

Page 63: Maintenance instructions

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Maintenance Instructions

CHECKING/SERVICING

  WARNING

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. Remove blades for

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.

  CAUTION

ALWAYS wear eye protection and gloves

when sharpening a blade.

Wing

Tip

Do Not Grind or

Sharpen on Underside

Intersection

Wear Area

Sharpen at

Original 30° Angle

30°

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

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. Reinstall the blade, washer, lock

washer, and nut.

Tighten the nut to 60 ft-lb

(81.3 N·m).

NOTE: When reinstalling blades on GHS models,

remember, the

blades turn toward each other

(counter-rotate) and the RH and LH blade cannot be

switched. Check for proper blade rotation before

installing blades on the deck. Refer to

Blade Rota-

tion for GHS Mower Deck illustration shown in

Clogging Checklist in Operating Instructions for

correct blade rotation.

Drive Belts

Raise the body and inspect the condition of the

four (4) belts (3 belts on SD models)

every 25 hours

of operation - engine PTO drive, jackshaft drive, hy-

drostatic ground drive, and GHS blower 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.