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12
Engine
• Follow the engine manual instructions and
recommended schedule for lubricating engine
components.
Blade Care
• Periodically inspect the blade adapter and pulley
for cracks, especially if you strike a foreign object.
Replace when necessary.
• Disconnect spark plug wire from spark plug.
• Turn mower on its side making sure that the air filter
and the carburetor are up.
To Remove Blade:
• Remove the hex bolt which holds the blade
adapter-pulley assembly to the engine crankshaft.
See Figure 10 . Remove the pulley assembly and
the bell support from the crankshaft.
• Remove blade from the blade adapter and pulley.
Figure 10
To Replace Blade:
• Before reinstalling the blade-pulley assembly to the
unit, lubricate the engine crankshaft and the inner
surface of the blade adapter with light oil.
• Also lubricate the bolt hole and the hex bolt.
• Insert the hex bolt, earlier removed, through the
center holes on the blade bell support and the
blade adapter-pulley assembly respectively.
• Install the blade assembly on the crankshaft.
Tighten the hex bolt to the recommended torque.
Blade Mounting Torque:
Center bolt: 450 in.lbs. minimum, 600
in.lbs. maximum.
IMPORTANT:
The bolt used to secure the blade to the
engine is specially heat-treated. Do not substitute. To
order replacement bolt, refer to the parts list in the back
of this manual.
To Sharpen Blade:
• The blade can be sharpened with a file or on a
grinding wheel. Do not attempt to sharpen the
blade while it is still on the mower.
• Follow the original angle of grind as a guide. Make
sure that each cutting edge receives an equal
amount of grinding to prevent an unbalanced blade.
NOTE: An unbalanced blade will cause excessive
vibration when rotating at high speeds, may cause
damage to the mower and could break, causing
personal injury. Test the blade by balancing it on a
round shaft screwdriver or a blade balancer.
• If the blade is not balanced, remove metal from the
heavy side until it balances evenly.
WARNING:
When removing the cutting
blade for sharpening or replacement, protect
hands by using heavy gloves or a thick rag to
grasp the cutting blade.
Adapter-Pulley
Assembly
Blade
Hex Bolt
Blade Bell
Support
WARNING:
To ensure safe operation of
your unit, all nuts and bolts must be checked
periodically for correct tightness.