Replacing Fan and Alternator Belts

RG11950-UN-07NOV01

290 mm (11.4 in.) Fan Height and Lower*

RG11951-UN-07NOV01

338 mm (13.3 in.) Fan Height and Higher Without Freon Compressor*

RG11952-UN-07NOV01

402 mm (15.8 in.) Fan Height With Freon Compressor*

A - Alternator

CSP - Crankshaft Pulley

FC - Freon (A/C) Compressor

FD - Fan Drive

I - Idler Pulley

T - Tensioner

CP - Coolant Pump

NOTE: Depending on the application, the idler pulley position varies. However the replacement procedure remains the same.

Refer to CHECKING BELT TENSIONER SPRING TENSION AND BELT WEAR in Lubrication and Maintenance/500 Hour/12 Month Section for additional information on the belt tensioner.

1. Inspect belts for cracks, fraying, or stretched out areas. Replace if necessary.

2. To replace belt with automatic tensioner, release tension on belt using a breaker bar and socket on tension arm.

   To replace belt with manual tensioner, release tension at belt tensioner (See MANUAL BELT TENSIONER ADJUSTMENT in Lubrication and Maintenance/500 Hour/12 Month Section.)

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

4. 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.

   Install new belt, making sure belt is correctly seated in all pulley grooves. Refer to belt routing at right for your application.

5. Apply tension to belt with tensioner. Remove socket.

6. Install fan guard if removed.

7. Start engine and check belt alignment.

*Measured from crank centerline to fan drive center.