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MAINTENANCE
SERVICE PROCEDURE
CHECK ALTERNATOR BELT TENSION, ADJUST
CHECKING
The deflection should be 13 to 16 mm (0.5 to 0.6 in) when a point
midway between the drive pulley and alternator pulley is pressed
with the thumb with a force of 98.1 N (10 kgf).
ADJUSTING
1. Remove cover mounting bolts (6) (2 places), and remove the
cover.
2.
Loosen bolts and nuts (1), (2) and (5), then turn nut (4) to adjust
the tension of the belt.
3.
After adjusting, tighten bolts and nuts (1), (2) and (5) to secure
alternator (3).
4. Reinstall the cover removed in step 1. Confirm that no part of
the cover touches any turning part of the alternator.
REMARK
Check each pulley for breakage and wear of the V-groove. In particular, check that the V-belt does not touch the
bottom of the V-groove.
If any abnormality is found, ask your Komatsu distributor for replacement of the pulley.
If the V-belt is so lengthened that it cannot be adjusted any more or if it has any cuts or cracks, replace it.
When adjusting the V-belt, do not press the alternator directly with a bar, but put a wood piece, etc. in-between
them.
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.
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