Craftsman 917.377960 Owner's Manual page 12

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-
shaft
Key.
keyway
Blade,
Blade
bolt
• 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.
Pinion
E-tin{
_orrect
Locknut
washer
Crank-
Hardened
Trailing
Blade
shaft
washer
edge
adaptor
GRASS
CATCHER
• The grass catcher may be hos_d 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
Washer
Hubcap
ENGINE
LUBRICATION
Use only high quar_ detergent oil rated with
API service classification SF, SG or SH.
Select the oil's SAE viscosity grade accordng
to your expected operating temperature.
TEMPERATURE
RANGE ANTICIPATED
BEFORE NEXT OIL C='t.IINGE
NOTE: Although multi-viscosity oils (5W30,
10W30 etc.) improve starting in cold weather,
these multi-visco6ity 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.
wheel gear teeth.
12

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