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Craftsman 917.377631 Owner's Manual page 12

6.75 horsepower 21" rear discharge power propelled' electric start rotary lawn mower
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NOTE'. We do not recommend sharpening
blade - but if you do, be sure the blade is
balanced.
TO SHARPEN BLADE
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
ona gdnding wheel. Donotattempt t o
shaq_mwhilaonthe rnower.
• To check blade balance, drive a nsil into a
beam or wall. Leave about one inch of the
straight r_l exposed. Place center hole of
blade over the head of 81e nail. If blade is
balanced, it should remain in a horizontal
pes_.
Iferd_ e_ of_e blede m_se
downward, shaq0en the heavy end until the
blade is balanced.
Blade
Crank-
shaft
keyway
Blade
bolt
Lock
washer
Crank-
Hardened
Trailing
Blade
shaft
washer
edge
adaptor
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 ordedng.
DRIVE WHEELS
Check rear drive wheels each time you
mow to be sure they move freely. The
wheels not tuming freely means trash,
grass cuttings, etc., may be inside the
ddve wheel and dust cover area and must
be cleaned out to free ddve wheels.
If necessary to clean the drive wheels,
check beth 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.
19
• The pinion gear must be installed with
the left gear on the left side and with the
right gear on the right side, from an
operator's view.
• The pinion gear is stamped with an "L"
(left) or =R" (right) on the inside.
If
installed incorrectly, the drive system will
not work.
• Place wheels back on adjuster axles.
• Replace Iocknuts and hubcaps.
NOTE:
Pinions and drive pawls should be
cleaned and lubricated with grease
approximately every 25 hours or once a
year.
Locknut
Ddve pin
Dust cover
Pinion
E-dng
ENGINE
LUBRICATION
Use only high quality detergent oil rated wi_
API service classification SF, SG or SH.
Select the oil's SAE viscosity grade according
to your expected operating temperature.
NOTE: _
mull_viscosity o ils (5W30,
10W30 etc.) improvestartingin coldweather,
thesemulti-viscos'_ oilswillresultin increased
oilconsumpt_ when used above 32°1 -.
Checkyour engineoil levelmorefrequentlyto
avoidposs_le enginedamage from running
lowon oil.
Cringe the oq_er every25 houmof
operationorat least once a year ifthe lawn
rnoweris notusedfor25 hoursin one year.
Checkthe crankcaseoil lavel beforesta_ng
the engineand aftereach Eve (5) hours of
conlinuous use.T_hton oUplugsecurelyasch
timeyou checkthe oil lavel.

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