Komatsu PC138US-11 Operation & Maintenance Manual page 362

MAINTENANCE PROCEDURE
3.
Press the center between compressor pulley (A) and fan
pulley (B) with a finger (approximately 60 N).
If deflection (C) is 6 to 9 mm, the belt tension is normal.
If the deflection is out of the standard, adjust it to the
standard value.
METHOD FOR ADJUSTING AIR CONDITIONER COMPRESSOR BELT
1.
Loosen the bolts (1) (4 pieces).
There is no need of removing bolt (1). Also, take care not
to loosen too much.
2.
Loosen nut (2) in direction (A).
Nut (2) is provided to prevent loosening of jack bolt (3).
3.
Tighten the jack bolt (3).
Compressor (4) moves in direction (A), and the compres-
sor belt is tensed.
4.
Press the center between drive pulley (A) and compressor
pulley (B) with a finger (approximately 60 N).
If deflection (C) is 6 to 9 mm, the belt tension is normal.
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MAINTENANCE