Air Conditioner Compressor Belt Tension - Inspect/Adjust - Komatsu PC78US-6 Operation & Maintenance Manual

MAINTENANCE PROCEDURE

Air Conditioner Compressor Belt Tension - Inspect/Adjust

(If equipped)
Inspection
Press the belt at a point midway between the fan pulley and
compressor pulley with a finger force of approx. 58.8 N (6 kgf) and
check that the deflection is 10 to 12 mm (0.4 to 0.5 in).
Adjustment
1. Loosen bolts (1) and (2).
2. Loosen nut (3) and tighten bolt (4) until fan belt deflection of 10
to 12 mm (0.4 to 0.5 in) (approx. 58.8 N or approx. 6 kgf) is
obtained.
3. Tighten bolts (1) and (2) to fasten the compressor.
4. Tighten nut (3) after loosening bolt (4) by 2 to 3 turns, and then
retighten bolt (4).
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 to come from the belt.
When the new V-belt is set, readjust it after operation for an hour.
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MAINTENANCE