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Craftsman 917.377971 Owner's Manual page 13

6.75 horsepower 21" multi-cut power propelled 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.
Blade
Crank-
adapter
shaft
keyway
• If you remove the drive pinions, wipe
clean with dry cloth. Reassemble
dry.
Do not lubricate. Do not use oil or
grease.
• The pinion gear, on both sides of the
mower, are the same, however, they
must be installed correctly,
If installed
incorrectly, the drive system will not
work.
• There are arrows embossed on both
sides of the pinion gear.
With the arrow
at the top of the pinion, the arrow must
point towards front of mower.
If the
arrow points to the rear, turn the pinion
around and assemble to mower.
• Place wheels back on adjuster axles.
• Replace Iocknuts
and hubcaps.
Correct
Incorrect
Wave
Blade
Blade
bolt
Pinion
E-ring
Lock
washer
Crank-
Hardened
washer
Trailing
shaft
edge
adapter
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.
DRIVE
WHEELS
Check rear drive wheels each time you
mow to be sure they move freely.
The
wheels not turning freely means trash,
grass cuttings, etc., may be inside the
drive wheel and dust cover area and must
be cleaned out to free drive wheels.
If necessary to clean the drive wheels,
"
check both rear wheels.
• Remove hubcaps and Iocknuts.
• Remove wheels from wheel adjuster
axles.
• Remove any trash or grass cuttings from
inside the dust cover, pinion and/or drive
wheel gear teeth.
Locknut
_Hubcap
Washer
ENGINE '
LUBRICATION
Use only high quality detergent oil rated with
API service classificatien SF, SG or SH.
Select the oil's SAlE viscosity grade according
to your expected operating temperature.
SAE VISCOSITY GRADES
"C
_0.
.20"
10"
20"
TEMPERATURE
RANGE/_ITICIPATEO
BEFORE NEXT O4L CHANGE
NOTE: Although multi-viscosity oils (5W30,
10W30 etc.) improve starting in cold weather,
these multi-viscosity oils will result in increased
oil consump'don 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
operalion or at least once a year if the lawn
mower is not used for 25 hours in one year.
13

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