Case CX490D, Operator'S Manual

Page: 278 / 370

6 - MAINTENANCE
Air conditioning system
WARNING
Escaping refrigerant may cause frostbite!
Always wear protective goggles when handling refrigerant. If you get refrigerant in your eye, immedi-
ately flush your eyes with water for 15 minutes. Seek medical assistance immediately.
Failure to comply could result in death or serious injury.
W0339A
System charge check
To check the charge of the air conditioning system, pro-
ceed as follows:
1. Start the engine and turn on the air-condition-
ing system.
Set the engine speed to 1400 –
1600 RPM .
2. Open the rear left-hand door to access the air-con-
ditioning dryer.
3. Let the system operate for about 5 min , then check
the inspection gauge of the dryer.
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Refer to the following conditions:
A. The fluid in the gauge is at first transparent, then
it quickly turns whitish with few small air bubbles,
and stays in this condition. The charge status is
correct.
B. The fluid in the gauge features at first many air
bubbles, and stays in this condition. The system
is underfilled. Call the CASE CONSTRUCTION
dealer in order to inspect the system lines for leaks
and to restore the correct charge status.
C. The fluid in the gauge is at first transparent with
no air bubbles appearing, and stays in this condi-
tion. The system is overfilled. Call the CASE CON-
STRUCTION dealer in order to restore the correct
charge status.
4. Clean the lines and the connections of the air-con-
ditioning system. Clean the radiator of the air-con-
ditioning system in the radiators compartment.
NOTICE: Operate the air conditioning at least once every
50 h in order to keep the compressor's seals lubricated.
The recommended practice is to set the cab temperature
to the lowest level, to set the cab ventilation fan to the max-
imum speed and thus to let the system run for
15 – 20 min .
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