Craftsman 917.374100 - Manual (Page 14)

LAWN MOWER
Always observe safety rules when per­
forming any maintenance.
TIRES
• Keep tires free of gasoline, oil, or insect
control chemicals which can harm rubber.
• Avoid stumps, stones, deep ruts, sharp
objects and other hazards that may
cause tire damage.
DRIVE WHEELS
Check rear drive wheels each time before
you mow to be sure they move freely.
The wheels not turning freely means trash,
grass cuttings, etc. are inthe drive wheel area
and must be cleaned to free drive wheels.
If necessary to clean the drive wheels, be
sure to clean both rear wheels.
BLADE CARE
For best results, mower blade must be kept
sharp. Replace a bent or damaged blade.
A CAUTION: Use only a replacement
blade approved by the manufacturer of
your mower. Using a blade not approved
by the manufacturer of your mower is haz­
ardous, could damage your mower and
void your warranty.
TO REMOVE BLADE
1. Disconnect spark plug wire from spark
plug and place wire where it cannot
come in contact with plug.
2. Turn lawn mower on its side. Make
sure air filter and carburetor are up.
3. Use a wood block between blade and
mower housing to prevent blade from
turning when removing blade bolt.
NOTE: Protect your hands with gloves
and/or wrap blade with heavy cloth.
4. Remove blade bolt by turning counter­
clockwise.
5. Remove blade and attaching hardware
(bolt, lock washer, hardened washer).
6. Remove debris shield.
NOTE: Remove the blade adapter and
check the key inside hub of blade adapter.
The key must be in good condition to work
properly. Replace adapter if damaged.
TO REPLACE BLADE
1. Position blade adapter on engine crank­
shaft. Be sure key in adapter and crank­
shaft keyway are aligned; and that drive
belt is inside tabs of belt retainer.
2. Install debris shield.
3. Position blade on the blade adapter.
IMPORTANT: To ensure proper assembly,
center hole in blade must align with star
on blade adapter.
4. Be sure the trailing edge of blade (oppo­
site sharp edge) is up toward engine.
5. Install the blade bolt with the lock
washer and hardened washer into
blade adapter and crankshaft.
6. Use block of wood between blade and
lawn mower housing and tighten the
blade bolt, turning clockwise.
• The recommended tightening torque is
35-40 ft. lbs.
IMPORTANT: Blade bolt is heat treated.
If bolt needs replacing, replace only with
approved bolt shown in the Repair Parts
section of this manual.
Crank- \\
shaft
keyway \ ''
Blade adapter
Debris shield
Blade
Hardened
washer
Lockwasher
Blade bolt
TO SHARPEN BLADE
NOTE: We do not recommend sharpening
blade - but if you do, be sure blade is bal­
anced. An unbalanced blade will cause
eventual damage to 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, you will need a
5/8" diameter steel bolt, pin, or a cone bal­
ancer. (When using a cone balancer, follow
instructions supplied with balancer.)
NOTE: Do not use a nail for balancing
blade. The lobes of the center hole may
appear to be centered, but are not.
• Slide blade on to an unthreaded portion
of the steel bolt or pin and hold the
bolt or pin parallel with the ground. 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.