Maintenance - Husqvarna HU725F Operator's Manual

MAINTENANCE
LAWN MOWER
Always observe safety rules when performing any main-
tenance.
TIRES
• Keep tires free of gasoline, oil, or insect control chem-
icals which can harm rubber.
• Avoid stumps, stones, deep ruts, sharp objects and
other hazards that may cause tire damage.
DRIVE WHEELS
Check front drive wheels each time before you mow to be
sure they move freely.
The wheels not turning freely means trash, grass cuttings,
etc. are in the drive wheel area and must be cleaned to
free drive wheels.
If necessary to clean the drive wheels, be sure to clean
both front wheels.
1. Remove hubcaps, Iocknuts and washers.
2. Remove wheels from wheel adjusters.
3. Remove any trash or grass cuttings from inside the
dust cover, pinion and/or drive wheel gear teeth.
4. Put wheels back in place.
NOTE: If after cleaning, the drive wheels do not turn freely,
contact a qualified service center.
BLADE CARE
For best results, mowerb}ade must be kept sharp. Replace
bent or damaged blades.
CAUTION: Useonlya replacement blade
approved by the manufacturer of your
mower. Using a blade not approved
by the manufacturer of your mower is
hazardous, could damage your mower
and void your warranty.
TO REMOVE BLADE (See Fig. 12)
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 and hardened washer).
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 (See Fig. 12)
1. Position the blade adapter on the engine crankshaft.
Be sure key in adapter and crankshaft keyway are
aligned.
2. Position blade on the blade adapter.
IMPORTANT: TO ENSURE PROPER ASSEMBLY, CENTER
HOLE IN BLADE MUST ALIGN WITH STAR ON BLADE
ADAPTER.
3. Be sure the trailing edge of blade (opposite sharp edge)
is up toward the engine.
4. Installthe blade boltwith the Iockwasher and hardened
washer into blade adapter and crankshaft.
5. Use block of wood between blade and lawn mower hous-
ing and tighten the blade bolt, turning clockwise.
• The recommended tightening torque is 35-40 ft. Ibs.
IMPORTANT: BLADEBOLTISHEATTREATED.IF BOLTNEEDS
REPLACING, REPLACE ONLY WITH APPROVED BOLT.
BLADEADAPTER KEY CRANKSHAFT
KEYWAY
BLADE
LOCK
WASHER
\\
0 \
J
BLADE
BOLT WASHER
BELT
TRAiLiNG EDC CRANKSHAFT RETAINER
FIG. 12
TO SHARPEN BLADE (See Fig. 13)
NOTE: We do not recommend sharpening blade- but if you
do, be sure the blade is balanced. An unbalanced blade
will cause eventual damage to lawn mower or engine.
• The blade can be sharpened with a file or on a grind-
ing wheel. Do not attempt to sharpen while on the
mowe r.
• To check blade balance, you will need a 5/8" diameter
steel bolt, pin, or a cone balancer. (When using a
cone balancer, follow the 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.
CENTER HOLE
5/8" BOLT OR PIN
BLADE
12
FIG. 13