Case 580SR Service Manual page 794

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PERFORMANCE TEST EXAMPLE 3
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6
5
1. High side normal
2. High side hand valve closed
3. High side hose connected to high side service
connector
4. Not used
PROBLEM
Insufficient cooling.
CAUSE
Air in the system.
CONDITIONS*
Low side pressure reading does not change when
compressor cycles ON and OFF.
High side pressure slightly high or slightly low.
Gauge should read 13.3-14.8 bar.
Evaporator air not cold.
CORRECTIVE PROCEDURES
1. Leak test the system. Give special attention to
the compressor seal area.
SECTION 50 - CAB HEATING AND AIR CONDITIONING
Performance Test Example 3
4
5. Low side hose connected to low side service
connector
6. Low side hand valve closed
7. Low side low
2. Discharge and recover the refrigerant from the
system.
3. Repair leaks.
4. Replace receiver/drier.
5. Check compressor oil to ensure no loss.
6. Evacuate the system.
7. Charge the system.
8. Performance test the system.
DIAGNOSIS
Air or moisture in system. System not fully charged.
NOTE: * test procedure based upon ambient tem-
perature of 35 °C.
For proper high side gauge reading for other ambi-
ent temperatures, refer to the pressure temperature
chart.
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F28699