305 CR Mini Hydraulic Excavator Belt - Inspect/Adjust/Replace Caterpillar


Belt - Inspect/Adjust/Replace
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305 CR Mini Hydraulic Excavator [SEBU7428]
BASIC ENGINE
BELT TIGHTENER GP
305 CR Mini Hydraulic Excavator Belt - Inspect/Adjust/Replace
1.1. Water Pump Belt, Fan Drive Belt, and Alternator Belt
2.1. Air Conditioner Belt (If Equipped)


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.


Your engine can be equipped with a water pump, with a fan drive, and with an alternator. Your engine can also be equipped 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 pair 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.

Water Pump Belt, Fan Drive Belt, and Alternator Belt



    Illustration 1g00823546
    (1) Adjusting bolt
    (2) Water pump pulley
    (3) Alternator pulley
    (4) Alternator mounting bolt
    (5) Belt
    (6) Crankshaft pulley

  1. Open the engine hood.


    Illustration 2g00823530

  2. Apply approximately 98 N (22 lb) of force midway between the pulleys.

  3. Measure the deflection of the belt. The belt should deflect 8 to 11 mm (5/16 to 7/16 inch).

  4. If the deflection is not correct, loosen alternator mounting bolt (4) and adjusting bolt (1). Move the alternator forward and backward in order to adjust belt (5) to the specified tension.

  5. When the adjustment is correct, tighten adjusting bolt (1) and mounting bolt (4) securely.

  6. Check the deflection of the belt again.

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

Air Conditioner Belt (If Equipped)


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 3g01035107
    (7) Adjustment bolt
    (8) Bolt

  1. Check the belt tension.

    Note: To check the belt tension, apply 98 N (22 lb) of force midway between the pulleys. Correctly adjusted belts will deflect 8 to 11 mm (5/16 to 7/16 inch).

  2. If the deflection is not correct, loosen adjustment bolt (7) and bolts (8).

  3. Adjust the belt tension.

  4. When the adjustment is correct, tighten bolt (7) to a torque of 28 ± 7 N·m (20.7 ± 5.2 lb ft) and tighten bolts (8) to a torque of 28 ± 7 N·m (20.7 ± 5.2 lb ft).

  5. 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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