SPRING 8U5458 - Caterpillar

Inspection
To maximize the engine performance, inspect the belts for wear and for cracking. Replace belts that are worn or damaged.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 belt is stretched. The additional load on the new belt could cause the new belt to break.If the belts are too loose, vibration causes unnecessary wear on the belts and pulleys. Loose belts may slip enough to cause overheating.To check the belt tension accurately, Gauge 144-0235 Belt Tension Gauge should be used.
Illustration 1 g01003936
Typical example
(1) 144-0235 Belt Tension Gauge Install the gauge (1) at the center of the belt between the alternator and the crankshaft pulley and check the belt tension. The correct tension for a new belt is 400 N (90 lb) to 489 N (110 lb). The correct tension for a used belt that has been in operation for 30 minutes or more at the rated speed is 267 N (60 lb) to 356 N (80 lb).If twin belts are installed, check and adjust the tension on both belts.Adjustment
Illustration 2 g01091158
Typical example
(1) Adjusting bolt
(2) Mounting bolts
Loosen the mounting bolts (2) and the adjusting bolt (1).
Move the alternator in order to increase or decrease the belt tension.
Tighten the adjusting bolt (1). Tighten the mounting bolts (2). Refer to the Specifications Manual for the correct torque settings.