R2900 Load Haul Dump Belts - Inspect/Adjust Caterpillar


Belts - Inspect/Adjust
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1.1. Adjust the Alternator Belt
2.1. Adjust the Air Conditioning Compressor Belt (If Equipped)

For maximum engine performance and utilization of your engine, inspect the belts for wear and for cracking. Check and adjust the belt tension to minimize belt slippage which will decrease belt life and cause poor performance of the alternator and any driven equipment.

  1. Inspect the condition of the belts.

  1. Inspect the tension of the alternator belt and air conditioning compressor belts.

  1. Check the belt tightener for wear/alignment and that it is maintaining correct belt tension.



Illustration 1g00908664

To check the belt tension, apply 110 N (25 lb) of force midway between the pulleys. Correctly adjusted belts will deflect 17 ± 3 mm (0.67 ± 0.12 inch).

If new belt(s) are installed, check belt adjustment again, after 30 minutes of operation. For multiple belt drive applications, always replace belts in matched sets.

If only one belt of a matched set is replaced, it will carry more of a load than the belts not replaced since the older belts are stretched. The additional load on the new belt could cause it to break.

Adjust the Alternator Belt




    Illustration 2g00930760

  1. Loosen alternator mounting bolts (1) and locknut (2) .

  1. Turn adjusting nut (3) until the correct belt tension is reached.

  1. Tighten locknut (2) to 150 ± 20 N·m (110 ± 15 lb ft). Tighten alternator mounting bolts (1) .

  1. Check the belt deflection. If the amount of deflection is incorrect, repeat Steps 1 to 3.

Adjust the Air Conditioning Compressor Belt (If Equipped)




    Illustration 3g00930765

  1. Loosen mounting bolt (1) and locknut (2) .

  1. Turn adjusting nut (3) to obtain the correct adjustment.

  1. Tighten the locknut to 150 ± 20 N·m (110 ± 15 lb ft). Tighten mounting bolt (1) .

  1. Check the belt deflection. If the amount of deflection is incorrect, repeat Steps 1 to 3.

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