Komatsu WA800-3E0, Operation & Maintenance Manual

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SERVICE PROCEDURE
MAINTENANCE
4-34
CHECK AIR CONDITIONER 4
CHECK LEVEL OF REFRIGERANT (GAS)
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.
(1) Sight glass
(2) Receiver
If there is a lack of refrigerant (gas), the cooling performance
will be poor. When operating the air conditioner at high speed
with the engine at full throttle, use the receiver sight glass
(inspection window) to check the condition of the refrigerant
gas (R134a) flowing in the refrigerant circuit.
1. Start the engine.
2. Run the air conditioner at maximum cooling.
3. Open the cover at the rear of the operator's compartment.
4. Look at the sight glass (inspection window) of the receiver
to check the condition of the refrigerant gas (Freon R134a)
flowing through the refrigerant circuit.
q
No bubbles in refrigerant flow: Suitable (A)
q
Some bubbles in flow
(bubbles pass continuously): Lack of refrigerant (B)
q
Colorless, transparent: No refrigerant (C)
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 THE 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.
A
B
C