MAINTENANCE SERVICE PROCEDURE
4-33
CHECK, ADJUST AIR CONDITIONER 4
(Machines equipped with cab)
CHECK LEVEL OF REFRIGERANT
WARNING
If the refrigerant used in the air conditioner 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 gas (freon 134a) in the refrigerant circuit
through the sight glass (2) (inspection window) of the receiver
(1) when the cooler is running at high speed.
q (A) Correct: No bubbles are included in the flow
q (B) Low: Bubbles are included in the flow
(bubbles pass continuously)
q (C) None: Colorless, transparent
REMARK
When there are bubbles, the refrigerant gas level is low, so
contact your Komatsu distributors to have refrigerant added. If
the air conditioner is run with the refrigerant gas level low, it will
cause damage to the compressor.
OPERATING AIR CONDITIONER OFF-SEASON
Even during the off-season, operate the air conditioner for 3 to 5 minutes once a month to maintain the oil film at all
parts of the compressor.
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