Replacing Alternator Belt (With Manual Tensioner)

RG9872-UN-12FEB99

Remove Belt Guard

RG9873-UN-12FEB99

Tension With Swing Arm

A - Belt Guard

B - Mounting Cap Screws

C - Tensioner Arm

D - Notched Units

Inspect belt for cracks, fraying or stretched-out areas. If belt is worn or damaged, replace it as follows.

NOTE: It is not necessary to remove belt guard (A) to replace belt.

NOTE: While belt is removed, inspect pulleys and bearings. Rotate and feel for hard turning or any unusual sounds. If pulleys or bearings need replacement, see your John Deere dealer.

1. Loosen both belt tensioner mounting cap screws (B).

2. Swing tensioner arm (C) away from belt to loosen belt.

3. Remove poly-vee belt from pulleys and discard belt.

4. Install new belt, making sure belt is correctly seated in all pulley grooves.

5. Swing tensioner arm into belt to remove all belt slack.

NOTE: Belt adjustment uses notched units (D) above the adjusting cap screw slot on the tensioner.

6. Using notches on tensioner to count units, move tensioner arm to stretch belt 1-1/2 units (new belt) or one unit (used belt) for appropriate tension.

7. Tighten tensioner mounting cap screws (B) to 70 N˙m (52 lb-ft).