Usage:
Vee Belts
Checking Belts
- 1. Check belt wear.
- 2. Check tension of each belt.
If one belt in a set requires replacement, always install a new matched set of belts-never replace just the worn belt. If only the worn belt is replaced, the new belt will be carrying all of the load-as it will not be stretched as much as the older belts-and all of the belts will fail in rapid succession.
In the following illustrations the pulley marked X is the adjusting pulley. The pulley marked C is the crankshaft. Force is applied at the arrow. See the chart for the force and belt deflection.
FIG. A ALTERNATOR DRIVE AND WATER PUMP DRIVE
Adjusting Belt Tension
Alternator Drive (Fig. A)
- 1. Loosen the bolts on the alternator.
- 2. Move the alternator until the belt is properly adjusted. Tighten the adjustment bolt.
- 3. Check the adjustment.
- 4. Tighten the bolt.
FIG. B HIGH MOUNT FAN DRIVE
Water Pump-Fan Drive (Fig. A), and Air Compressor Drive (Fig. C & D):
- 1. Loosen the adjusting bolt and pivot bolt on the idler.
- 2. Move the idler outward until the belt is properly adjusted. Tighten the adjustment bolt.
- 3. Check the adjustment.
- 4. Tighten the pivot bolt.
FIG. C AIR COMPRESSOR DRIVE
High-Mount Fan Drive (Fig. B)
- 1. Loosen the four bolts holding the adjustment plate.
- 2. Loosen the adjustment bolt locknut.
- 3. Turn the adjustment bolt to obtain correct bolt adjustment.
- 4. Tighten the four bolts holding the adjustment plate.
- 5. Tighten the adjustment bolt locknut.
FIG. D AIR COMPRESSOR DRIVE WITH HIGH MOUNT FAN DRIVE
Safety Shut-Off Controls
The shut-off controls must be checked to insure proper functioning if and when needed. To prevent damage to your engine while making the required tests, only authorized personnel should perform the checks. Contact your Caterpillar dealer.