Komatsu PC2000-8 BACKHOE, Operation & Maintenance Manual

Page: 387 / 504

MAINTENANCE
MAINTENANCE PROCEDURE
4-69
Checking
1. Remove cover (3) at the front of the engine. When 6 bolts
(1) are removed, the cover will come off.
2. The deflection should be 10 to 15 mm when a point mid-
way between the alternator and the drive pulley is pressed
with a finger force of approx. 58.8 N {approx. 6 kg}.
A: Alternator pulley
B: Drive pulley
Adjustment
1. Loosen bolts and nuts (5) - (8) in number order and move
the alternator.
q
If nut (9) is tightened, the belt tension is increased; if
nut (9) is loosened, the belt tension is reduced.
2. After adjusting the belt, tighten bolts and nuts (5) - (8) in the
reverse order (from (8) to (5)). Finally, tighten nut (9).
q
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.
q
If the V-belt is elongated and there is no more allow-
ance for adjustment, or if the belt is cracked or cut,
replace the belt.
q
When the V-belt has been replaced, adjust again after
running for 1 hour.
3. Install cover (3).