MAINTENANCE
• Place the new blade
on
the shaft against the fan assembly.
Make sure it is installed with
the
curved ends pointing
up toward the mower deck and not down toward the
ground.
• Replace the blade insulator and spacer, then thread the
blade nut on the shaft and finger tighten.
NOTE: Make certain all parts are replaced
in
the exact
order
in
which they were removed.
• Torque
the
blade
nut
down
using a
torque
wrench
(not provided)
to
ensure the bolt is properly tightened.
The recommended
torque
for
the blade nut is
220-
310
in.
Ibs.
SHARPENING
THE
BLADE
See
Figure
11
.
For best mowing performance, the mower blade must be
kept sharp.A dull blade does not cut grass evenly and over-
loads the motor. Under normal circumstances, sharpening
the blade twice during the mowing season is usually suf-
ficient. However,
if your lawn has sandy soil, more frequent
sharpenings may be required.
• Following the instructions
in
the Replacing the Cutting
Blade section, remove the mower blade. DO NOT attempt
to
sharpen the blade while it
is
attached
to
the mower.
A.
WARNING:
When removing, Inspect
the
blade carefully. If blade is
bent or damaged, replace immediately with a new blade.
Failure
to
replace a bent or damaged blade could cause
an
accident resulting in possible serious injury.
• Using a fine-tooth file or stone, sharpen cutting edges
on
both ends of the blade. rem<lving equal amounts of
material from both ends.
BALANCING
THE
BL.ADE
See
Figure12.
When sharpening, care should be taken
to
keep the blade
balanced.
An
unbalanced blade will cause excessive vibra-
tion when the mower is running. This vibration will eventually
cause damage
to
the mower. especially
the
motor.
To
check the blade balance:
• Clamp a screwdriver horizontally
in
a vise as shown.
NOTE: If a vise is not available, a straight nail can also
be used.
• Place the center hole of blade
on
the screwdriver (or nail)
shank.
• If blade is balanced,
it
will remain in a horizontal position.
If either end of the blade drops downward, sharpen the
heavy side until the blade is balanced.
BLADE
INSULATOR
Fig.10
Fi
12
Page 15
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