D11R Track-Type Tractor C32 Engine Retrofit Supplement Caterpillar

This engine is equipped with a belt tightener that automatically adjusts the belt to the correct tension.

Inspect the Belt

1. Park the machine on level ground. Lower the dozer blade to the ground. Move the transmission control to the NEUTRAL position and engage the parking brake. Shut off the engine.

2. Turn the battery disconnect switch to the OFF position.

3. Open the rear engine access door that is located on the left-hand side of the machine. The serpentine belt is located forward of the cab firewall.
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   Illustration 1	g01228154
   Rear view

4. Inspect the condition of serpentine belt (3). Replace the serpentine belt if excessive wear or cracking has occurred. Wear due to belt slippage indicates that the belt tensioner possibly needs to be replaced.

5. Close the engine access door.

6. Turn the battery disconnect switch to the ON position.

Replace the Belt

1. Replace the belt if any of the following conditions exist:

   • excessive cracking

   • excessive wear

   • excessive damage

2. Park the machine on level ground. Lower the dozer blade to the ground. Move the transmission control to the NEUTRAL position and engage the parking brake. Shut off the engine.

3. Turn the battery disconnect switch to the OFF position.

Remove the Belt

1. Remove the floorplate bolts and open the manhole cover that is located in the cab.
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   Illustration 2	g01228297

2. Remove eight bolts (8) from coupling guard (10), as shown. Remove any hoses that are attached to the guard.

3. Loosen top guard (9) and lift the top guard for clearance. Do not remove the top guard.

4. Insert a 12.7 mm (0.50 inch) ratchet into square hole on belt tensioner (6).

5. Pry the belt tensioner in a counterclockwise direction in order to remove the tension from the belt.

6. Remove the belt from the pulleys.

Install the Belt

1. Loosen the spare belt from the tie-down straps that surrounds coupling guard (10) (not shown).

2. Free the belt from the guard by pulling the belt backward. Then, slide the belt over coupling shaft (5) in a forward direction. Install the belt on drive pulley (4).

3. Insert a 12.7 mm (0.50 inch) ratchet into the square hole in the tensioner. Push up the ratchet and install the new belt on tensioner (6).

4. Pry the belt tensioner in a clockwise direction in order to install the belt.

   Note: Remove the belt guards (1, 2), as needed.

5. To achieve the correct belt tension, move the belt tensioner inward. Tighten belt tensioner (6) in place. Recheck the belt adjustment.

6. Install top guard (9) to coupling guard (10) with eight bolts (8), as shown.

7. Turn the battery disconnect switch to the ON position.

   Note: If a new belt is installed, recheck the belt adjustment after 30 minutes of operation.

   Note: The second belt replacement will require loosening of the accessory drive shaft.

8. Close the manhole cover in the cab.