RADIATOR GP- 3913895 - 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.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
BearingsIf the belts are too tight, unnecessary stress is placed on the components. This stress reduces the service life of the components.Adjusting the Alternator Belt
Illustration 1 g03001297
Typical alternator (1) Mounting bolts (2) Adjusting nuts
Remove the drive belt guard.
Loosen mounting bolts (1), adjusting nuts (2) .
Turn adjusting nuts (2) in order to increase or decrease the drive belt tension.
Tighten adjusting nuts (2). Tighten mounting bolts (1). For the proper torque, refer to Specifications, SENR3130, "Torque Specifications Module".
Reinstall the drive belt guard.If new drive belts are installed, check the drive belt tension again after 30 minutes of engine operation at the rated rpm.Check the belt tension according to the information in Specifications, KENR6838.