Komatsu PW118MR-11 Operation & Maintenance Manual page 354

MAINTENANCE PROCEDURE
Check level of refrigerant (gas)
If the refrigerant used in the air conditioner gets into your eyes or is splashed on your hands, it may
cause loss of sight or frostbite. Never touch the refrigerant. Do not loosen any part of the refrigerant
circuit.
Do not bring any open 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. Perform the check while running the
engine at high idle and operating the air conditioner at high speed.
Check the condition of the refrigerant gas (HFC 134a) that cir-
culates the refrigerant circuit, through sight glass (inspection
window) at the refrigerant hose fitting.
(A) No bubbles in the coolant: Suitable
(B) Some bubbles in refrigerant flow (bubbles pass continuous-
ly): Insufficient
(C) Colorless, transparent: Lack of refrigerant
REMARK
When there are bubbles, the refrigerant gas level is low, so contact your Komatsu distributor to have refrigerant
added. If the air conditioner is run with the refrigerant gas level low, it will cause damage to the compressor.
4-26
k k
WARNING
WENAM00130
MAINTENANCE
RKA65170