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Copyright © 2014 MAT Engine Technologies, LLC
ENG - 21
Maintenance
(Continued)
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TO REMOVE BLADE (FIG. 8)
1. Disconnect spark plug wire from spark plug
and place wire where it can not come in
contact with plug.
2. Turn mower on its side. Make sure air filter and
carburetor are up.
3. Use a wood block between blade and mower
housing to prevent blade from turning when
removing blade bolt.
NOTE:
Protect your hands with gloves and/or
wrap blade with heavy cloth.
4. Remove blade bolt (U) by turning counter
clockwise.
X
U
W
V
Fig. 8
W
X
U
5. Remove blade (V) and attaching hardware
[bolt (U) and disc spring washer (X)].
TO REPLACE BLADE (FIG. 7)
1. Position blade on the blade adapter (W)
aligning the two (2) holes in the blade with the
raised lugs on the adapter.
2. Be sure the trailing edge of blade (opposite
sharp edge) is up toward the engine.
3. Install the blade bolt (U) with the disc spring
washer (X) into blade adapter and crankshaft.
4. Use block of wood between blade and mower
housing and tighten the blade bolt, turning
clockwise. Torque to 25–30 ft/lbs.
IMPORTANT:
Periodically check the blade bolt
for correct torque.
IMPORTANT:
Blade bolt is heat treated. If bolt
needs replacing, replace only with approved bolt
shown in the
Repair Parts
section of this manual.
TO SHARPEN BLADE
NOTE:
We do not recommend sharpening the
blade- but if you do, be sure the blade is bal-
anced.
CAUTION
An unbalanced blade will cause excessive vibra-
tion when rotating at high speeds. It may cause
damage to mower and could break causing
personal injury.
• The blade can be sharpened with a file or on
a grinding wheel. Do not attempt to sharpen
while on the mower.
• To check blade balance, drive a nail into
a beam or wall. Leave about one inch of
the straight nail exposed. Place center hole
of blade over the head of the nail. If blade
is balanced, it should remain in a horizontal
position. If either end of the blade moves
downward, sharpen the heavy end until the
blade is balanced.
