312C and 312C L Excavator Belt - Inspect/Adjust/Replace Caterpillar


Belt - Inspect/Adjust/Replace
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312C and 312C L Excavator [SEBU7565]
BASIC ENGINE
BELT TIGHTENER GP
312C and 312C L Excavator Belt - Inspect/Adjust/Replace
1.1. Alternator Belt and Fan Drive Belt
2.1. Air Conditioner Belt

Your engine can be equipped with an alternator belt, with a fan drive belt and with accessory drive belts. 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.

Alternator Belt and Fan Drive Belt




    Illustration 1g00294055

    (1) Mounting bolt. (2) Alternator. (3) Bracket bolt.

  1. Check the belt tension.

    Note: To check the belt tension, apply 110 N (25 lb) of force midway between the pulleys. Correctly adjusted belts will deflect 13 to 19 mm (1/2 to 3/4 inch).

  1. To adjust the alternator belt and the fan drive belt, loosen bracket bolt (3) and mounting bolt (1) on the alternator bracket.

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

  1. If necessary, use a pry bar in the square hole in the mounting bracket.

  1. Tighten mounting bolt (1) and bracket bolt (3) .

    Note: The alternator shaft nut must be tightened to a torque of 50 ± 5 N·m (37 ± 4 lb ft).

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

Air Conditioner Belt


NOTICE

The V-belt must be tensioned correctly. Failure to tension the belt properly could cause damage to the belt and/or to the air conditioner compressor.





    Illustration 2g00821832

    (1) Pulley bolt. (2) Adjustment bolt. (3)

  1. Check the belt tension.

    Note: To check the belt tension, apply 110 N (25 lb) of force midway between the pulleys. Correctly adjusted belts will deflect 13 to 19 mm (1/2 to 3/4 inch).

  1. If the deflection is not correct, loosen pulley bolt (1) .

  1. Turn adjusting bolt (2) in order to adjust the belt tension.

  1. When the adjustment is correct, tighten bolt (1) to a torque of 38 ± 7 N·m (28 ± 5 lb ft) and tighten bolt (2) to a torque of 15 ± 3 N·m (11 ± 2.2 lb ft).

  1. Check the deflection again.

    Note: If a new belt is installed, check the belt adjustment again after 30 minutes of engine operation at the rated speed.

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