TUBE AS 4666836 - Caterpillar

Inspection
Illustration 1 g00750216
The belt cover must be removed for inspection, adjustment and replacement. (1) Mounting bolts (2) Adjustment bolt (3) Typical belt tension gaugeTo maximize the engine performance, inspect the belt for wear and for cracking. Check the belt tension. Adjust the belt tension in order to minimize belt slippage. Belt slippage will decrease the life of the belt.For the correct tension on the belt, refer to Specifications, "Belt Tension Chart".Adjustment
Remove the belt cover.
Loosen mounting bolts (1) and adjusting bolt (2) .
Slide the alternator in the direction that will give the correct tension.
Tighten adjusting bolt (2). Tighten mounting bolts (1). Refer to the Operation and Maintenance Manual, "Torque Specifications" for the proper torques.
Reinstall the belt cover.If new belts are installed, check the belt adjustment again after 30 minutes of engine operation at the rated rpm.Replacement of Multiple Drive Belts
For applications that require multiple drive belts, replace the belts in matched sets. Replacing only one belt of a matched set will cause the new belt to carry more load because the older belts are stretched. The additional load on the new belt could cause the new belt to break.