Komatsu PC118MR-8, Operation And Maintenance Manual

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MAINTENANCE
MAINTENANCE PROCEDURES
4-35
AIR CONDITIONER MAINTENANCE AND CHECKING 4
Coolant (gas) level check
WARNING
q
Soon after the machine has been stopped the engine is very hot and may cause burns; let the engine
cool down to 40-45°C before carrying out any check.
q
The coolant used in the air conditioning system is very dangerous. If it is sprayed into the eyes or in
case of contact with the skin, it may cause blindness or frostbite. To avoid any explosion, do not
generate sparks and do not use naked flames near the air conditioner.
I f t h e r e f r i g e r a n t g a s is n o t e n o u g h , t h e c o n d i t io n e r
performance will not be satisfactory. When the conditioner is
activated at high speed with the engine at maximum, use the
inspection glass (1) at the mouth of the coolant pipe to check
the conditions of the coolant gas (Freon R134a) flowing along
the circuit.
(A) - No bubbles are detected in the coolant flow: correct level
(B) - Continuous bubbles flow: insufficient coolant
(C) - Without colour, transparent: no coolant.
REMARK
When bubbles are detected, the refrigerant gas level is low;
therefore, contact the Komatsu distributor for topping up. If the
conditioner is used even when the coolant level is low, the
compressor may result damaged.
Checks during the season the conditioner is not used
Even in the periods in which the air conditioner is not used, operate the compressor at low speed for
approximately 3-5 minutes at least once a month. This operation ensures the constant lubrication of all the moving
parts of the compressor.
WEAM014802