Every 500 Hours Maintenance - Komatsu PC290LC-11 Operation & Maintenance Manual

MAINTENANCE PROCEDURE
3.
Loosen bolts (3) (3 pieces).
There is no need of removing bolt (3). Also, take care not
to loosen too much.
4.
Loosen nut (4) in direction (A).
Nut (4) is provided to prevent loosening of jack bolt (5).
5.
Tighten jack bolt (5).
Compressor (6) moves in direction (A), and the compres-
sor belt is tensed.
6.
Press the center between drive pulley (A) and compressor
pulley (B) with a finger (approximately 60 N {6.1 kg}).
If deflection (C) is 6.3 to 8.7 mm, the belt tension is normal.
If the deflection is out of the standard, adjust it to the
standard value by repeating steps 4 and 6.
7.
When the belt tension becomes appropriate, tighten bolts
(3) (3 pieces) and fix it.
Tightening torque: 59 to 74 Nm{6.0 to 7.5 kgm}
8.
After tightening nut (4) until it touches boss (7), then tight-
en it further in direction (B) to prevent it from loosening.
Tightening torque108 to 132 Nm{11.0 to 13.5 kgm}
9.
After fixing, check again that the belt tension is proper.
Adjust it again if the tension is not within the proper range.
10. Check each pulley for damage, wear of the V-groove, and
the wear of the V-belt. In particular, be sure to check that
the V-belt is not touching the bottom of the V-groove.
11. Replace the belt with a new one if the belt is stretched and has no allowance for adjustment, or has slipping
sound or squeak because of cuts or cracks of the belt.
NOTICE
When the new V-belt is installed, readjust it after operating for 1 hour.

EVERY 500 HOURS MAINTENANCE

Maintenance for every 100 and 250 hours should be performed at the same time.
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MAINTENANCE