64
Maintenance Instructions
CHECKING/SERVICING
Sharpen Mower Blades
Check mower blade(s) for
straightness, sharp-
ness, condition of
the cutting edge,
and
balance
every 10 hours
of operation (or more often when
mowing abrasive type grass or operating on sandy
soils).
Replace blades if worn, bent, cracked, or
otherwise damaged
(refer to
REPLACING/RE-
PAIRING
the
Mower Blades
in this 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 engine and blade drive by pulling hard.
1. Stop the engine, remove ignition key, and dis-
connect the spark plug wires
before
raising the
mower deck to service blades.
2. Raise the deck and
secure
it in the
TILT-UP
po sition. Refer to
CLEANING
the
Grass Build-
up in Mower Deck Housing
in this section for
deck rais ing instructions.
DANGER
NEVER operate cutter blades with the
deck in the raised position.
NOTE:
PTO shaft must be
disconnected
be-
fore 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 dif-
ference in blade tip track is
more than 1/8 in.
(3 mm),
the blade is bent and
should be re-
placed.
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
electric blade sharpener, conventional electric
grinder, 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.
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