Husqvarna 67521 HV 用户手册

Always observe safety rules when performing any main-
 te nance.

•      Keep tires free of gasoline, oil, or insect control chem-

 i cals which can harm rubber.

•     Avoid stumps, stones, deep ruts, sharp objects and 

other hazards that may cause tire damage.

Check rear 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 rear wheels.

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

TO REMOVE BLADE (See Fig. 14)
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 fi lter and 

carburetor are up.

3.    Use a wood block between blade and mower hous ing 

to prevent blade from turning when re mov ing 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).

TO REPLACE BLADE (See Fig. 14)
1.   Position blade on the blade adapter aligning the two 

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

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

is up toward the engine.

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

washer into blade adapter and crank shaft.

4.   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.

TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE

SAE VISCOSITY GRADES

-20

0

30

40

80

100

-30

-20

0

20

30

40

F
C

32

-10

10

60

il i

h 1

TO SHARPEN BLADE
NOTE:  We do not recommend sharp en ing blade - but if 
you do, be sure the blade is balanced. 

Care should be taken to keep the blade balanced. An 
un bal anced blade will cause eventual damage to lawn 
mower or engine. 

•      The blade can be sharp ened with a fi le 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.

•      The grass catcher may be hosed with water, but must 

be dry when used.

•      Check your grass catcher often for damage or de te ri o -

ra tion.  Through normal use it will wear.  If catcher needs 
replacing, replace only with ap 

proved replacement 

catcher shown in the Repair Parts section of this manual.  
Give the lawn mower model number when ordering.

Use only high quality detergent oil rated with API service 
classifi cation SG–SL. Select the oil's SAE viscosity grade 
according to your expected operating temperature.

NOTE:  Multi-viscosity oils (5W30, 10W30 etc.) improve 
starting in cold weather, and you should check your engine 
oil level frequently to avoid possible engine damage from 
running low on oil.