Komatsu WA480-8 Operation & Maintenance Manual page 370

MAINTENANCE PROCEDURE
METHOD FOR TESTING WHEN AIR CONDITIONER COMPRESSOR BELT IS RE-
PLACED
Press the middle point between the compressor pulley and crankshaft pulley with your thumb (approximately
98 N {10 kg} ).
The standard deflection is 22 to 23 mm.
When you use a belt tension gauge, the tension is normal if it is in the range of 540 to 637 N {55 to 65 kg} .
REMARK
When the belt is replaced with a new one, the above value is employed as the initial tension since a stronger
tension is required.
METHOD FOR ADJUSTING AIR CONDITIONER COMPRESSOR BELT
1.
Open the engine side cover on the right side of the ma-
chine.
2.
Remove the bolts (9 pieces) indicated by the arrows, and
remove cover (1).
3.
Loosen bolts (2) and (3).
REMARK
When the bolts (2) and (3) are loosened, bracket (5) for
compressor (4) can move, using the mounting position of
bolt (2) as a fulcrum.
4.
Loosen nut (6) installed to bracket (5), and then tighten
bolt (7).
Compressor (4) moves in direction A, and the compressor
belt is tensed.
5.
After adjusting the belt tension properly, tighten nut (6) until
it touches boss (8) and tighten it further in direction B.
Tightening torque: 157 to 196 Nm {16 to 20 kgm}
6.
Tighten bolts (2) and (3) to fix bracket (5).
Tightening torque
Bolt (2): 157 to 196 Nm {16 to 20 kgm}
Bolt (3): 98 to 123 Nm {10 to 12.5 kgm}
7.
After adjusting, install cover (1).
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MAINTENANCE