CP-663E, CS-663E and CS-683E Vibratory Compactors Caterpillar

Your engine can be equipped with a fan drive belt and with accessory drive belts. Your engine can also be equipped with an alternator belt. For maximum engine performance and maximum utilization of your engine, inspect the belts for wear and for cracking. Check the belt tension. Adjust the belt tension in order to minimize belt slippage. Belt slippage will decrease the belt life. Belt slippage will also cause poor performance of the alternator and of any driven equipment.

If new belts are installed, recheck the belt adjustment after 30 minutes of operation. If two belts or more are required for an application, replace the belts in belt sets. If only one belt of a matched set is replaced, the new belt will carry more load. This is due to the fact that the older belts are stretched. The additional load on the new belt could cause the new belt to break.

Open the engine compartment.

Alternator Belt

Show/hide table



Illustration 1	g00484481

1. To check the belt tension, apply 110 N (25 lb) of force midway between the pulleys. Correctly adjusted belts will deflect 14 to 20 mm (1/2 to 3/4 inch).

2. In order to adjust the alternator belt, loosen bracket bolt (1) and mounting bolt (2) on the alternator bracket.

3. To achieve the correct adjustment, move the alternator inward or move the alternator outward, as required.

4. If necessary, use a pry bar in square hole (3) in the alternator bracket.

5. Tighten mounting bolt (2) and bracket bolt (1) .

6. If new belts are installed, check the belt and adjustment again after 30 minutes of engine operation at the rated speed.

7. Check the position of the fan shroud. Adjust the position of the fan shroud so that the fan will not rub against the shroud. Maintain a 9.4 mm (0.38 inch) clearance between the fan and the shroud.

Air Conditioner Belt (If Equipped)

1. Stop the engine in order to inspect the air conditioner belt.

Show/hide table



Illustration 2	g00763250

2. Inspect the condition of the air conditioner belt and the adjustment of the air conditioner belt. The air conditioner belt should deflect 14 to 20 mm (0.55 to 0.79 inch) under 110 N (25 lb) of force.

Show/hide table



Illustration 3	g00763247

3. Loosen compressor bracket mounting bolt (1). Loosen adjusting locknut (2) .

4. Move the compressor until the correct belt tension is reached.

5. Move the compressor until the correct belt tension is reached. Tighten adjusting locknut (2). Tighten compressor bracket mounting bolt (1) .

6. Recheck the belt deflection. If the amount of deflection is incorrect, repeat Step 3 to Step 5.

7. Start the engine. If poor cooling is still experienced, turn off the air conditioner. Stop the engine. Notify your Caterpillar dealer for air conditioner system service.