Komatsu D65EX-12 Operation & Maintenance Manual page 215

MAINTENANCE
DRAIN WATER, SEDIMENT FROM FUEL FILTER
1. Open the engine side cover on the left side of the
machine, remove drain plug (1) at the bottom of the fuel
filter, and drain the sediment and water together with fuel.
2. Tighten drain plug (1).
3. Loosen the knob of feed pump (2), and pump it up and
down approx. 50 - 60 times to bleed the air.
4. Push in the knob of feed pump (2) and tighten it.
CHECK FAN BELT TENSION, ADJUST
INSPECTION
The belt should normally deflect by 6 to 7mm (0.24 to 0.28in)
when pressed with the finger (with a force of approx. 59N
(6kgf)) at a point midway between the tension pulley and fan
pulley.
ADJUSTMENT
1. Loosen bolts and nuts (1), (2), (3).
2. Turn nut (4) clockwise, then move alternator (5) to adjust
the belt tension so that the deflection is approx. 10 mm
when pushed with a force of approx. 6 kg.
3. Tighten the bolts and nuts (1), (2), and (3) to fix alternator
(5) in position.
SERVICE PROCEDURE
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