Check, Adjust Air Conditioner - Komatsu D65EX-12 Operation & Maintenance Manual

SERVICE PROCEDURE

CHECK, ADJUST AIR CONDITIONER

(Machine equipped with cab)
CHECKING TENSION OF COMPRESSOR BELT
If the belt is loose, it will slip and the cooling effect will be
reduced. From time to time, press a point midway between the
drive pulley and compressor pulley with your finger (approx.
98N (10kgf,22.05 lb)) and check that the tension is 15 to 18mm
(0.59 to 0.71in). When the belt is new, there will be initial elon-
gation, so always adjust again after 2 or 3 days.
CHECK LEVEL OF REFRIGERANT (GAS)
If the refrigerant used in the cooler gets into your eyes or on your hands, it may cause loss of sight or
frostbite. Do not touch the refrigerant. Never loosen any part of the refrigerant circuit.
Do not bring any flame close to any point where the refrigerant gas is leaking.
If the level of the refrigerant (gas) is low, the cooling effect will
be reduced. Run the engine at high idling, and check the flow
of the refrigerant in the refrigerant circuit through the sight
glass of the receiver when the cooler is running at high speed.
No bubbles in refrigerant flow: Suitable
Some bubbles in flow (bubbles pass continuously): Lack of
refrigerant
Colorless, transparent: No refrigerant
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.
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WARNING
MAINTENANCE