3-60
24. SERVICE PROCEDURE
24.6.5 CHECK, AIR CONDITIONER COMPRESSOR BELT
TENSION, ADJUST
Checking
The deflection should be approx. 12.5 – 16.5 mm (0.5 – 0.7 in)
when pressed with a finger force of approx. 98.1 N (10 kgf) at a point
midway between the air conditioner compressor pulley and drive
pulley.
When using a belt tension gauge, the tension should be in a
range of 353 – 530 N (36 – 54 kgf).
Checking when replacing V-belt
The deflection should be approx. 9.0 – 12.5 mm (0.355 – 0.5 in)
when pressed with a finger force of approx. 98.1 N (10 kgf) at a point
midway between the air conditioner compressor pulley and drive
pulley.
When using a belt tension gauge, the tension should be in a
range of 530 – 745 N (54 – 76 kgf).
Adjusting
1. Loosen locknut 1.
2. Turn adjustment nut 2 to adjust so that the belt tension is the
specified value.
‡ V-belt tension
Deflection when cheking: 12.5 – 16.5 mm (0.5 – 0.7 in)
(98.1 N (10 kgf))
Deflection when replacing: 9 – 12.5 mm (0.355 – 0.5 in)
(98.1 N (10 kgf))
3. Check each pulley for damage and wear of the V-groove, and
check the V-belt for wear. Be particularly careful to check that
the V-belt does not contact the bottom of the V-groove.
4. If the V-belt is elongated and there is no more allowance for
adjustment, or if the belt is cut or cracked, replace it with a new
belt.
5. After adjusting, tighten lock nut 1.
6. After replacing the V-belt, operate the machine for one hour,
then check and adjust again.
24.6.6 CHECK FRAME AND BOOM
1. Wash the frame and boom so that the check can be carried out
easily.
2. Check all parts of the frame and boom for damage.
In particular, check the colored part in the diagram, and repair
if any cracks or other damage are found. For details of the method
of repair, please contact your Komatsu distributor.
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