Component Tests and General Diagnostics

AIR Pump Drive Belt Adjustment
On most applications, drive belt adjustment for the Air Pump is accomplished by adjusting another component position (example: idler and generator). For those applications that utilize an automatic tensioner, no adjustment is necessary. For those applications requiring AIR Pump movement to adjust belt tension, proceed with the following:

1. Check all pump and mounting bolts. Tighten to specification, if required.
2. Install the Belt Tension Gauge T63L-8620-A on the drive belt and check tension. Compare the belt tension to the specified belt tension and adjust as necessary
3. If adjustment is necessary, loosen the pump mounting and adjustment arm bolts and move the pump toward or away from the engine until correct tension is obtained. Use pump belt tensioning tool (Tool T75L-9480-A) to hold belt tension while tightening the mounting bolts. Install the tension gauge and check the belt tension.

CAUTION: Do not use pry bar.