CARRIAGE AS-FORK 1491411 - Caterpillar

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Your engine is equipped with a water pump, with a fan drive, and with an alternator. Your engine can also be equipped with an air conditioner 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.Water Pump Belt, Fan Drive Belt, and Alternator Belt
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Open the engine hood.
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(1) Mounting bolt (2) Bracket bolt (3) Adjusting bolt
Apply approximately 98 N (22 lb) force midway between the pulleys.
Measure the deflection of the belt. The belt should deflect 10 to 12 mm (0.4 to 0.5 inch).
If the deflection is not correct, loosen alternator mounting bolt (1) and bracket bolt (2). Turn adjusting bolt (3) in order to adjust the belt tension.
When the adjustment is correct, tighten bolt (1) and bolt (2) .
Check the deflection of the belt again.
If a new belt is installed, run the engine at rated speed for thirty minutes. Check the belt adjustment. Readjust the belt, if necessary.