Craftsman 917.387254 Owner's Manual page 10

4.0 horsepower 20" rear discharge rotary lawn mower
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TO SHARPEN
BLADE
NOTE: We do not recommend sharpening
blade - but if you do, be sure the blade is
balanced.
Care should be taken to keep the blade
balanced.
An unbalanced blade will cause
eventual damage to lawn mower or
engine.
• 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.
IMPORTANT:
Blade bolt is grade 8 heat
treated.
Blade
adapter
Key
_
Blade
_"
Blade
bolt
Crankshaft
keyway
washer Hardened
Blade
washer
Trailing
adapter
edge
GRASS CATCHER
• The grass catcher may be hosed with
water, but must be dry when used.
• Check your grass catcher often for
damage or deterioration.
Through
normal use it will wear. If catcher needs
replacing, replace only with a manufac-
turer approved replacement catcher.
Give the lawn mower model number
when ordering.
ENGINE
LUBRICATION
Use only high quality detergent oil rated with
API service class'_cationSF, SG or SH.
Select the oil's 8AE viscositygrade according
to your expected operating temperature.
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, "20"
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NOTE: Although multJ-viscosily oils (5W30,
10W30 etc.) improve starting in cold weather,
these multi-viscosity oils will result in increased
oil consumption when used above 32°F.
Check your engine oil level more frequently to
avoid possible engine damage from running
low on oil.
Change the oil after every 25 hours of
operation or at least once a year if the
lawn mower is not used for 25 hours in
one year.
Check the crankcase oil level before starting
the engine and after each five (5) hours of
continuous use. l'_jhten oil plug securely each
time you check the oil level.
TO CHANGE ENGINE OIL
• Disconnect
spark plug wire from spark
plug and place wire where it cannot
come in contact with spark plug.
• Be sure lawn mower is on level surface.
• Oil will drain more freely when warm.
• Catch oil in a suitable container.
• Remove bottom oil drain plug.
• After oil has drained completely, replace
oil drain plug and tighten securely.
• Refill engine with oil. Pour slowly. Do
not over fill.
• Fill to top of slot inside of filler hole.
• Reconnect spark plug wire to spark
plug.
Drain plug
AIR FILTER
Your engine will not run properly and may
be damaged by using a dirty air fitter.
Replace the air filter every year, more
often if you mow in very dusty, dirty
conditions. Do not wash air filter.
TO CHANGE AIR FILTER
• Remove the air filter by turning counter-
clockwise to the stop and pull away from
collar.
• Remove filter from inside of cover.
10

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