Husqvarna 7021RS 用户手册

See “TO ADJUST CUTTING HEIGHT” in the Operation 
section of this manual.

The rear defl ector, attached between the rear wheels of 
your mower, is provided to minimize the possibility that 
objects will be thrown out of the rear of the mower into 
the operator's mowing position.  If the defl ector becomes 
damaged, it should be replaced.

1.    Disconnect spark plug wire from spark plug and place 

wire where it cannot come in contact with plug.

2.    Remove screws retaining drive cover (not shown); and 

remove drive cover from lawn mower housing.

3.   Remove drive cable from anchor, then detach it and 

return spring from idler arm assembly.

4.      Remove idler arm assembly from housing by removing 

hex nut; then remove drive belt from drive pulley, belt 
keepers and idler arm assembly.

5.    Turn lawn mower on its side. Make sure air fi lter and 

carburetor are up.

6.    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.

7.    Remove blade bolt. 

8.    Remove blade, attaching hardware (bolt, lock wash er, 

hardened wash er), blade adapter / pulley and debris 
shield.  Note that the debris shield has a screw which 
fi ts into the housing.

9.    Remove drive belt from engine pulley; discard old belt.

1.    Place new drive belt on engine pulley. 

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

in housing.

3.    Return mower to upright position.

4.      Install new drive belt into idler arm assembly, then around 

the drive pulley.  Be sure belt is inside of belt keepers.

5.   Reattach idler arm assembly with hex nut previously 

removed.

6.    Turn lawn mower on its side. Make sure air fi lter and 

carburetor are up.

7.   Reattach debris shield to housing with tab of debris 

shield in housing hole.

8.   Position blade on the blade adapter / pulley aligning 

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

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

is up toward the engine as shown.

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

washer into blade adapter / pulley and crankshaft.

11. 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.

12. Return mower to upright position.

13.  Reattach drive cable and return spring to the idler arm 

assembly, then reattach drive cable to anchor.

14.  Reattach drive cover with screws previously removed.

15.  Connect spark plug wire to spark plug.