Komatsu Galeo PC27MR-2 Operation & Maintence Manual page 234

AIR CONDITIONER
Every 250 Hours Maintenance
CHECK AND ADJUST AIR CONDITIONER COMPRESSOR BELT TENSION
Checking
The belt should deflect 5 to 6 mm (0.197 to 0.236 in) when pressed
with a finger force of approx. 58.8 N (6 kgf) at a point midway
between the idle pulley and compressor pulley.
Adjustment
Adjust the belt tension with adjustment nut (2) of idle pulley (1).
1. Open the engine rear cover and loosen locknut (3).
2. Adjust with adjustment nut (2) so that the deflection of the belt
is 10 to 15 mm (0.4 to 0.6 in) (approx. 58.8 N (approx. 6 kgf)).
3. Tighten nut (3) to hold idle pulley in position.
4. Check for damage to the pulleys, and wear of the V-groove and
V-belt. Be particularly careful to check that the V-belt is not in
contact with the bottom of the V-groove.
5. Replace belt if it has stretched, leaving no allowance for
adjustment, or if there is a cut or crack on V-belt.
6. When the new V-belt is set, readjust it after operation for an
hour.
6 - 8
ATTACHMENTS AND OPTIONS