Komatsu WA500-6H, Operation & Maintenance Manual

Page: 313 / 412

4.9 Service procedure
Maintenance Every 250 hours service
WA500-6H – VEAM430100
4-59
Check air conditioner compressor belt tension, adjust
Checking
Belt deflection (a) should be 5 to 10 mm (0.2 to 0.4 in) when
pressed with a finger force of approx. 58.8 N (6kgf) at a point
midway between the air compressor pulley and drive pulley.
Adjusting
1. Loosen bolts (1), (2) and nut (3).
2. Use adjustment bolt (4) to adjust the belt tension so that
deflection (a) is 5 -10 mm (0.2 - 0.4 in) when a point midway
between the air conditioner compressor pulley and the drive
pulley is pressed with the thumb with a force of approx. 58.8
N {6 kgf}.
3. Tighten the adjustment bolt to reduce the tension of the belt;
loosen the adjustment bolt to increase the tension of the
belt.
4. Tighten bolt (4) and secure in position with locknut (3).
5. Tighten bolt (1) and secure the air conditioner compressor in
position.
6. Check each pulley for damage, wear of the V-groove, and
wear of the V-belt. Be particularly careful to check that the V-
belt is not in contact with the bottom of the V-groove.
7. If the belt has elongated and there is no more allowance for
adjustment, or if the belt is cut or cracked, replace the belt.
Check for loose wheel hub bolts, tighten
If wheel hub nuts (1) are loose, tire wear will be increased and
may cause accidents.
1. Check for loose nuts, and tighten if necessary.
When checking for loose nuts, always turn the nuts in the
direction of tightening to check.
Tightening torque:
927 ± 103 N·m (94.5 ± 10.5 kgf·m, 683.5 ± 75.9 lbft)
2. If any stud bolt is broken, replace all the stud bolts for that
wheel.
GK050223
a
GK050224
4
3
1
2
GK032274
1