Check And Adjust Air Conditioner - Komatsu D155A-6 Operation & Maintenance Manual

MAINTENANCE

CHECK AND ADJUST AIR CONDITIONER

CHECK TENSION OF COMPRESSOR BELT
If the driving belt slackens, it is likely to slip, lowering the cooling
efficiency. Depress the mid point between drive pulley (1) and
compressor pulley (2) with a thumb (approx. 58.8 N {6 kg}) every
now and then to make sure that deflection amount (A) is approx. 10
mm (0.4 in).
When it is a new belt, elongation is expected in the initial period of
use, so be sure to make an adjustment in a few days after the
replacement.
CHECK LEVEL OF REFRIGERANT(GAS)
When handling refrigerant gas, always follow local laws and regulations.
The refrigerant used in the cooler is colorless and odorless and does not harm the atmosphere, but if the liquid gets into your
eyes or on your hands, it may cause loss of sight or frostbite, so never loosen any part of the refrigerant circuit.
If the level of the refrigerant (gas) is low, the cooling effect will be
reduced. Run the engine at high idle, and check the flow of the
refrigerant gas (R134a) in the refrigerant circuit through the sight
glass (2) (inspection window) of the receiver (1) when the cooler is
running at high speed.
(A) Correct: No bubbles are included in the flow
(B) Low: Bubbles are included in the flow
(bubbles pass continuously)
(C) None: Colorless, transparent
REMARK
When there are bubbles, the refrigerant gas level is low, so contact your refrigerant dealer to have refrigerant
added. If the air conditioner is run with the refrigerant gas level low, it will cause damage to the compressor.
New Freon R134a is used as the refrigerant.
WARNING
SERVICE PROCEDURE
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