Komatsu PC138USLC Operation & Maintenance Manual page 316

MAINTENANCE MAINTENANCE
2. Deflection (A) should be 5-8 mm (0.2-0.3 in) when the belt is
pressed with the thumb with a force of approx. 58.8 N (6 kg) at
a point midway between compressor pulley (3) and fan pulley
(4).
Adjustment
1. Loosen bolts (1) and (2).
Bracket (4) holds the compressor in place. When bolts (1)
and (2) are loosened, bracket (4) moves with the bolt (2)
securing position as a fulcrum.
2. Loosen nut (5) attached to the fixed bracket (3) and then
tighten bolt (6).
Tighten bolt (6) so that the deflection of the belt will be 5 to
8 mm (0.2 to 0.3 in) (approx. 58.8N (6 kg)).
3. Tighten bolts (1) and (2) to secure bracket (4).
4. Loosen bolt (6) to remove from bracket (4).
5. Tighten nut (5).
NOTICE
Check each pulley for damage, wear of the V-groove, and wear of the
V-belt. In particular, be sure to check that the V-belt is not touching the
bottom of the V-groove.
In case any of the following occurs, ask the Komatsu distributor in your
territory to replace the belts with new ones.
• The fan belt has elongated, leaving little allowance for adjustment.
• A cut or crack is found on the belt.
• Slipping or creaking sound is heard coming from the belt.
When the new V-belt is set, readjust it after one hour of operation.
MAINTENANCE PROCEDURE MAINTENANCE PROCEDURE
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