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SERVICE PROCEDURE
CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST
CHECKING
Depress a belt at a mid point between drive pulley (1) and
alternator pulley (2) with a thumb to apply 98 N (10 kg) - pressure,
and when deflection amount (A) remains between 13 mm and 16
mm (0.51 in and 0.63 in), the deflection is within the standard value.
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) and
adjust the belt tension.
3. After adjusting, tighten bolts and nuts (1), (2), and (5), to secure
alternator (3) in position.
4. Reinstall the cover removed in step 1. Confirm that no part of
the cover touches any moving 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.
4 - 62
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