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WALKER MANUFACTURING COMPANY
July 2006
SERVICE INSTRUCTIONS
Wheel Nuts Torque - Model MW, MB
Check every 100 hours the eight (8) Drive Tire mount-
ing nuts. They should each be torqued to 75-85 ft-lbs.
(101.7-115.2 N
ā
m).
Sharpen Mower Blades - All Models
Check mower blade(s) for straightness, sharpness,
condition of the cutting edge, and balance every 10
hours of operation (or more often when mowing abra-
sive type grass or operating on sandy soils). Replace
blades if worn, bent, cracked, or otherwise dam-
aged (refer to REPLACING/REPAIRING the Mower
Blades in the Service Procedures Section). Use the
following procedure to check and sharpen blades:
NOTE: Keep blades sharp - cutting with dull blades
not only yields a poor mowing job but slows the cutting
speed of the mower and causes extra wear on the en-
gine and blade drive by pulling hard.
Model MS, MW, MB, MC, MT, MTL
1. Stop the engine, remove ignition key, and discon-
nect the spark plug wire(s) before raising the mow-
er deck to service blades.
Model MD
1. Stop the engine, remove ignition key, and discon-
nect the electrical plug on the fuel shut-off solenoid
before raising the mower deck to service blades.
All Models
2. Raise the deck and secure it in the TILT-UP posi-
tion. Refer to CLEANING the Grass Buildup in
Mower Housing in this section for deck raising in-
structions.
NOTE: PTO shaft must be disconnected before
checking blades for straightness.
3. Check the blades for straightness by marking the
blade tip position inside the deck housing, and then
rotating the opposite end of the blade to the same
position and comparing. If the difference in blade
tip track is more than 1/8 in. (3 mm), the blade is
bent and should be replaced.
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 using a rag or a thick,
padded glove, while loosening 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 electric
blade sharpener, conventional electric grinder, or a
hand file.
Mower Blade Profile For Sharpening
6. Check blade balance by positioning the blade hor-
izontally 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 prop-
erly 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.
DANGER
NEVER operate cutter blades with the
deck in the raised position.
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.
CAUTION
ALWAYS wear eye protection and gloves
when sharpening a blade.
30Ā°
Do Not Grind or
Sharpen on Underside
Sharpen at
Original 30Ā° Angle
Intersection
Wear Area
Wing
Tip
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