Briggs & Stratton 5900834 ユーザーズマニュアル

 1.  Park the unit on a smooth, level surface such as 

a concrete floor.  Disengage the PTO, engage the 
parking brake, turn off the engine, and remove the 
ignition key.

 2.  Remove the mower deck guard.

 3.  Remove the PTO drive belt (see PTO DRIVE 

BELT REPLACEMENT for removal instructions).

 4.  Lower the mower deck to its lowest cutting 

position.

 5.  Loosen the idler pulley bolt (A, Figure 46) 2 full 

turns.  DO NOT remove the nut.

 6.  Loosen the spring placement jam nut (B).

 7.  Rotate the spring adjustment nut (C) COUNTER-

CLOCKWISE to release the tension on the mower 
deck drive belt adjustment spring (D).  Slide the 
adjustable idler pulley (E) towards the front of the 
mower deck to remove all the tension from the 
mower deck drive belt (F).

 8.  Remove the old belt and replace with a new 

one. Install the new belt on the LH sprocket (G) 
and make sure the belt is properly seated in the 
chevron of the sprocket.

 9.  Refer to Figure 47.  Align the holes in the 

sprockets with the spindle mounting hardware as 
shown.  The blades will be perpendicular to each 
other.

 10. Install the belt on the RH sprocket (H, Figure 46), 

again making sure the belt is properly seated in 
the chevron of the sprocket.

 11. Rotate the spring adjustment nut (C) CLOCKWISE 

until the belt tension spring is compressed to 
1-3/4” (4,45 cm) long.

 12. Retighten the spring placement jam nut (B).

 13. Tighten the idler pulley bolt (A) and torque to 55 ft. 

lbs. (74.5 Nm).

 14. Reinstall the PTO drive belt (see PTO DRIVE 

BELT REPLACEMENT for re-installation 
instructions).

Regular Maintenance

Not 

for  

Reproduction