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MAINTENANCE PROCEDURE
CHECK FAN BELT, ALTERNATOR BELT TENSION, ADJUST
Inspection
The deflection of the belt should be approx. 13 mm when
pressed with a finger force of approx. 58.8N (6 kgf) at mid-
point (a) between the alternator pulley and the fan pulley.
(A): Alternator pulley
(B): Fan pulley
(C): Crankshaft pulley
Adjustment
1. Loosen bolts and nuts (1), (2), (3).
Turn nut (4) clockwise to move alternator (5) so that the
belt deflects by approx. 13 mm with applied force of
approx. 6 kg (58.8 N).
2. Tighten bolts and nuts (1), (2) and (3) to secure alternator
(5).
Tightening torque
Lock nut (1) and (4): 137.2 ± 53.9 Nm (14 ± 5.5 kgm)
Bolt (2): 33.3 ± 4.9 Nm (3.4 ± 0.5 kgm)
Bolt (3): 127.4 ± 19.6 Nm (13 ± 2 kgm)
NOTICE
q
Check each pulley for damage, wear of the V-groove, and wear of the V-belt. In particular, be sure to
check that the V-belt is not touching the bottom of the V-groove.
q
In case any of the following occurs, ask the Komatsu distributor in your territory to replace the belts
with new ones.
〈 The fan belt has elongated, leaving little allowance for adjustment.
〈 A cut or crack is found on the belt.
〈 Slipping or creaking sound is heard coming from the belt.
q
When the new V-belt is set, readjust it after one hour of operation.
4-52
MAINTENANCE
4
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