G3300 Engines Caterpillar

Inspection

Inspect the alternator belt and the fan drive belts for wear and for cracking. Replace the belts if the belts are not in good condition.

Check the belt tension according to the information in the Service Manual, "Specifications".

Slippage of loose belts can reduce the efficiency of the driven components. Vibration of loose belts can cause unnecessary wear on the following components:

• Belts

• Pulleys

• Bearings

If the belts are too tight, unnecessary stress is placed on the components. This stress reduces the service life of the components.

Replacement

For applications that require multiple drive belts, replace the belts in matched sets. Replacing one drive belt of a matched set will cause the new drive belt to carry more load because the older drive belts are stretched. The additional load on the new drive belt could cause the new drive belt to fail.

Alternator Belt Adjustment

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Illustration 1	g00788814

1. Remove the belt guard.

2. Loosen mounting bolts (1) and adjusting bolt (2) .

3. Move the assembly in order to increase or decrease the belt tension.

4. Tighten adjusting bolt (2). Tighten mounting bolts (1) .

5. Reinstall the belt guard.

   If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm.

Adjustment of the Fan Drive Belt

1. Remove the belt guard.

2. Loosen the mounting bolt for the pulley.

3. Loosen the adjusting nut for the pulley.

4. Move the pulley in order to adjust the belt tension.

5. Tighten the adjusting nut.

6. Tighten the mounting bolt.

7. Reinstall the belt guard.

   If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm.