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21
Mower Blades
WARNING: The mower blades are sharp
and can cause severe injury. Always
protect hands by wearing heavy leather
work gloves to grasp blades.
Figure 29
• Secure the mower blade by putting a piece of wood
between the blade and the housing. See Figure 29.
• Remove the hex flange nut that secures the blade
to the spindle assembly.
It is extremely important that each cutting blade edge
be ground equally to maintain proper blade balance. An
unbalanced blade will cause excessive vibration when
rotating at high speeds, may cause damage to the unit,
or result in personal injury. The blade can be tested by
balancing it on a round shaft screwdriver. Grind metal
from the heavy side until it balances evenly.
When replacing the blade, be sure to install the blade
with the side of the blade marked “Bottom” (or with a
part number stamped in it) facing the ground when the
mower is in the operating position.
IMPORTANT:
Tighten the hex nut that secures mower
blade to spindle to 100 ft-lbs.
WARNING: Periodically inspect the blade
adapter for cracks, especially if you strike
a foreign object. Replace when necessary.
SECTION 8: TROUBLESHOOTING
Block
Of Wood
Blade
Trouble Possible Cause(s) Corrective Action
Engine fails to start PTO switch engaged.
Brake pedal not engaged.
Spark plug wire disconnected.
Throttle control lever not in correct
starting position.
Fuel tank empty, or stale fuel.
Blocked fuel line.
Faulty spark plug.
Engine flooded.
Disengage PTO switch.
Engage brake pedal.
Connect wire to spark plug.
Move throttle lever to FAST or START posi-
tion.
Fill tank with clean, fresh (not over 30 days)
gasoline.
Clean fuel line.
Clean, adjust gap or replace.
Crank engine with throttle in FAST position.
Engine runs erratic Unit running in START position.
Choke lever toward ON position.
Spark plug wire loose.
Blocked fuel line or stale fuel.
Vent in gas cap plugged.
Water or dirt in fuel system.
Dirty air cleaner.
Move throttle lever to FAST position.
Push choke lever to OFF position.
Connect and tighten spark plug wire.
Clean fuel line; fill tank with clean, fresh (not
over 30 days) gasoline.
Clear vent.
Drain fuel tank. Refill with fresh fuel.
Clean air cleaner.
Engine overheats Engine oil level low.
Air flow restricted.
Fill crankcase with proper oil.
Remove blower housing and clean.
Occasional skip (hesitates) at
high speed
Spark plug gap too close. Adjust gap to .030”.
Idles poorly Spark plug fouled, faulty or gap too
wide.
Dirty air cleaner.
Reset gap to .030” or replace spark plug.
Clean air cleaner.
Excessive vibration Cutting blade loose or unbalanced.
Bent cutting blade.
Tighten blade and adapter. Balance blade.
Replace blade.
Uneven cut Wheels not positioned correctly.
Dull blade.
Uneven tire pressure.
Place all four wheels in same height posi-
tion.
Sharpen or replace blade.
Equal tire pressure in all four wheels.