4.8 Service procedure Maintenance Every 250 hours service Check air conditioner compressor belt tension, adjust Checking 1. Open the engine side cover on the left side of the chassis. 2. Standard deflection “a“ between air conditioner compressor pulley (1) and drive pulley (2) when pressed with a thumb (approx. 98 N (10 kgf)) should be approx. 9.5 to 13.5 mm (0.4 to 0.5 in). When a belt tension gauge is used, the standard tension is within a range of 353 to 530 N (36 to 54 kgf). GK015020 Check when changing the v-belt The standard deflection "a" between the air conditioner com- pressor pulley (1) and drive pulley (2) when pressed with a thumb (approx. 98 N (10 kgf)) should be approx.
7 to 10 mm (0.28 to 0.4 in). a When a belt tension gauge is used, the standard tension is within a range of 530 to 745 N (54 to 76 kgf). 1 2 REMARK When the belt has been replaced with a new part, a high ten- sion is necessary, so the initial tension is in the value given above. GK032272 Adjusting 1. Open the engine side cover on the right side of the machine. 1 3 2. When adjusting, loosen 4 bolts (1), turn 2 adjustment bolts (2), and move bracket (3) and the compressor as one unit. 2 3. After adjusting, tighten bolts (1) and the locknut of bolts (2). NOTE z 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. GK015021 z 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 coming from the belt. z When the new V-belt is set, readjust it after one hour of operation. WA150-5H – VEAM934100 4-47