New Holland CX720 Repair Manual page 3055

BODY AND STRUCTURE - ENVIRONMENT CONTROL Air-conditioning system
8. Charge the system.
9. Performance test the system.
DIAGNOSIS: Expansion valve is not permitting a sufficient flow of refrigerant. May be caused by valve stuck in re-
stricted or closed position.
NOTE: * For proper high/low side gauge reading, refer to the Air Conditioning Temperature/Pressure Chart.
1 Low side low
3 High side hand valve closed
5 Not used
7 Low side hand valve closed
GAUGE READINGS AND INTERPRETATIONS
EXAMPLE 10
Problem:
Insufficient cooling.
Cause:
Restriction in high side of system.
CONDITIONS*
1. Low side pressure too low.
2. High side pressure too low.
NOTE: A normal or high reading of the high side pressure gauge under these conditions indicates the system is
overcharged or the condenser is restricted.
1. Evaporator only slightly cool.
2. Liquid line and receiver/drier are cool to touch and show frost or considerable moisture.
CORRECTIVE PROCEDURES
10
1z0o2004112107
2 High side low
4 High side hose connected to high side service
connector
6 Low side hose connected to low side service connector
2 4/7/2006
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