SUPPORT 2518310 - Caterpillar

Water Pump Belt, Fan Drive Belt, and Alternator Belt
Open the engine hood.
Illustration 1 g00688115
(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. Air Conditioner Belt (If Equipped)
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 2 g00761884
(4) Nut
(5) Adjusting bolt
Apply approximately 100 N (22 lb) force midway between the pulleys.
Measure the deflection of the belt. The belt should deflect 7 to 10 mm (0.3 to 0.4 inch).
If the deflection is not correct, loosen nut (4). Turn adjusting bolt (5) in order to adjust the belt tension.
When the adjustment is correct, tighten nut (4) to a torque of 38 7 N m (28 5 lb ft).
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 engine speed.
Close the engine hood.