Komatsu D85PX-15 - Check Alternator Drive Belt Tension, Adjust

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MAINTENANCE
SERVICE PROCEDURE
CHECK ALTERNATOR DRIVE BELT TENSION, ADJUST
CHECKING
The standard deflection for the drive belt is approx.13 to 16 mm
(0.51 to 0.63 in) when pressed by thumb (approx 99.1N {10 kg}) at
a point midway between the drive pulley and alternator pulley.
ADJUSTING
1. Loosen bolts (1) and nuts (2), (4), and (5), then turn nut (4) and
adjust the belt tension.
2.
After adjusting, tighten bolts and nuts (2), (4), and (5), to secure
alternator (3) in position.
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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