Check Alternator Drive Belt Tension, Adjust - Komatsu PC600-6 Operation And Maintenance Manual

MAINTENANCE

CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST

Checking
The standard deflection for the drive belt is 13 - 16 mm (0.51 - 0.63
in) when pressed with a thumb [at approx. 98.1 N (approx. 10 kgf)]
at a point midway between the drive pulley and alternator pulley.
Adjustment
1. Loosen bolts and nuts (1) - (6) in number order, and move the
alternator.
If nut (7) is tightened, the belt tension will increase; if nut (7)
is loosened, the belt will become loose.
2. After adjusting the belt, tighten bolts and nuts (1) - (6) in
reverse number order from (6) to (1). Finally, tighten nut (7).
Check each pulley for damage, wear of the V-groove, and
wear of the V-belt. Check in particular that the V-belt does
not contact the bottom of the V-groove.
If the V-belt is elongated and there is no more allowance for
adjustment, or if the belt is cracked or cut, replace the belt.
When the V-belt has been replaced, adjust again after
running for 1 hour.
MAINTENANCE PROCEDURE
4 - 49