Husqvarna 67521 ES 用户手册

Always observe safety rules when performing main tenance.

• 

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.

Check front drive wheels each time be fore 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, locknuts and washers.

2.  Remove wheels from wheel ad justers.

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.

For best results, mower blade must be kept sharp.  Re place
a bent or dam aged blade.

TO REMOVE BLADE (See Fig. 11)
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 hous ing

to prevent blade from turning when re moving 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 wash er 

and hardened wash er).

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 dam aged.

TO REPLACE BLADE (See Fig. 11)
1.  Position the blade adapter on the engine crank shaft.

Be sure key in adapter and crankshaft key way are 
aligned.

2.  Position the blade on the blade adapter aligning the 

two (2) holes in the blade with the raised lugs on the 
adapter.

3.  Be sure the trailing edge of blade (opposite sharp edge) 

is up toward the engine.

4.  Install the blade bolt with the lock washer and hard ened

washer into blade adapter and crank shaft.

5.  Use block of wood between blade and lawn mower 

housing and tighten the blade bolt, turning clock wise.

• 

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.

TO SHARPEN BLADE
NOTE:  We do not recommend sharp ening 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 sharp ened 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 ex posed.
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.

• 

To keep your drive system working properly, the gear 
case and area around the drive should be kept clean 
and free of trash build-up.  Clean under the drive cover 
twice a season.

• 

The gear case is filled with lubricant to the proper 
level at the factory.  The only time the lubricant needs 
attention is if service has been performed on the gear 
case.

• 

If lubricant is required, use only Texaco Starplex Pre-
mium 1 Grease, Part No. 750369.  Do not substitute.

• 

The grass catcher may be hosed with water, but must 
be dry when used.

• 

Check your grass catcher often for damage or de te-
rioration.  Through normal use it will wear.  If catcher 
needs replacing, replace only with ap proved replace-
ment catcher shown in the Repair Parts section of this 
manual.  Give the mower model number when ordering.