Komatsu WA800-3E0, Operation & Maintenance Manual

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MAINTENANCE
SERVICE PROCEDURE
4-51
CHECK ALTERNATOR BELT TENSION, ADJUST 4
Carry out the inspection and adjustment work after removing
cover (1).
CHECKING
The belt should normally deflect by about 20 mm when pressed
with the finger (with a force of approx. 58.8 N (6 kg) at a point
midway between the drive pulley and alternator pulley.
ADJUSTING
1. Loosen bolt (1) and lock nut (2).
2. Turn adjustment nut (3) to adjust the belt tension so that
the deflection is approx. 20 mm when pressed with a finger
force of approx. 58.8 N {6 kg}.
3. After adjusting, tighten locknut (2) and bolt (1).
4. Check each pulley for damage, wear of the V-groove, and
wear of the V-belt. Be particularly careful to check that the
V-belt is not in contact with the bottom of the V-groove.
5. If the belt has elongated and there is no more allowance for
adjustment, or if the belt is cut or cracked, replace the belt.
If the V-belt has been replaced with a new part, there will
be initial elongation, so inspect and adjust it again after
one-hour of operation.
Alternator pulley
Drive pulley