Husqvarna 55B21HV 用户手册

2.    Route the other end of the new drive belt through hole 

in housing.

3.   Reattach debris shield to housing with screw previ-

ously removed.  Be sure tab of debris shield is in gap 
of housing.

4.   Position blade on the blade adapter aligning the two 

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

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

is up toward the engine as shown (See Fig. 22).

6.      Install the blade bolt with the lock washer and hardened 

washer into blade adapter and crankshaft.

7.   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.

8.    Return mower to upright position.

9.   Install new drive belt into idler arm assembly, then 

around the drive pulley.  Be sure belt is inside of belt 
keepers (See Fig. 21).

NOTE: Pulling on the drive belt (to install it on the drive 
pulley) will cause the other end of the belt to free itself from 
the debris shield retainer and come into contact with the 
pulley end of the blade adapter.

10.  Reattach drive cable spring to the idler arm assembly, 

then reattach drive cable to anchor.

11.  Reattach drive cover with screws previously removed 

(See Fig. 20).

12.  Connect spark plug wire to spark plug.

The handle on your lawn mower has multiple height posi-
tions - adjust to height that suits you.

1.   Remove knob and carriage bolt on one side of the 

lower handle.

2.    While holding handle assembly, remove knob and car-

 riage bolt from opposite side, align hole in handle with 
desired hole in handle bracket and reassemble bolt and 
knob and tighten securely.

3.   Align opposite side of handle with same positioning 

hole and secure with bolt and knob.

Maintenance, re pair, or re place ment of the emission con-
 trol de vic es and sys tems, which are be ing done at the 
cus tom ers expense, may be performed by any non-road 
engine repair es tab lish ment or individual. Warranty repairs 
must be performed by an authorized engine man u fac tur er's 
service outlet.

Your engine speed has been factory set.  Do not attempt to 
increase engine speed or it may result in personal injury.  If 
you believe that the engine is running too fast or too slow, 
take your lawn mower to an authorized service center for 
repair and adjustment.

Your carburetor is not adjustable.  If your engine does not 
operate properly due to suspected carburetor problems, 
take your lawn mower to an authorized service center for 
repair and/or adjustment.

IMPORTANT:  NEVER TAMPER WITH THE ENGINE GOVERNOR, 
WHICH IS FACTORY SET FOR PROPER ENGINE SPEED. 

 

OVER SPEED ING THE ENGINE ABOVE THE FACTORY HIGH 
SPEED SETTING CAN BE DANGEROUS.  IF YOU THINK THE 
ENGINE-GOVERNED HIGH SPEED NEEDS ADJUSTING, 
CONTACT YOUR NEAREST AUTHORIZED SER VICE CEN TER, 
WHICH HAS PROPER EQUIP MENT AND EXPERIENCE TO 
MAKE ANY NEC ES SARY ADJUSTMENTS. 

Immediately prepare your lawn mower for storage at the end 
of the season or if the unit will not be used for 30 days or  more. 

When lawn mower is to be stored for a period of time, clean 
it thoroughly, remove all dirt, grease, leaves, etc.  Store in 
a clean, dry area.

1.   Clean entire lawn mower (See “CLEANING” in the 

Maintenance section of this manual).

2.    Lubricate as shown in the Maintenance section of this 

manual.

3.   Be sure that all nuts, bolts, screws, and pins are se-

curely fastened.  Inspect   moving parts for damage, 
breakage and wear.  Replace if necessary.

4.   Touch up all rusted or chipped paint surfaces; sand 

lightly before painting.