Case 580SR, Service Manual

Page: 808 / 1068

48 SECTION 50 - CAB HEATING AND AIR CONDITIONING
3.8 COMPONENTS OVERHAUL
GENERAL
S
WARNING
Before disconnecting components in the air condi-
tioning system the refrigerant gas must be dis-
charged and recovered using a certified recovery
system. Refer to Discharging the system.
Do Not
discharge the gas into the atmosphere.
If an air conditioning component is to be replaced
during a system overhaul it is necessary to drain any
refrigerant oil that has collected in the component
being replaced into a clean calibrated container.
A volume of clean refrigerant oil equivalent to that re-
moved from the replaced component must then be
added to the new item before being installed onto the
loader backhoe.
Upon completion of the repair evacuate, recharge,
leak test and performance test the system to ensure
correct operation.
EXPANSION VALVE
The expansion valve is not a serviceable item and
must be replaced if defective.
1. Fully discharge the air conditioning system.
2. Remove the seat to gain access to the valve.
3. To gain access to the expansion valve partially
lift the evaporator core from its position in the
cab floor.
4. Remove the screw securing the inlet and outlet
connections to the valve and pull valve from tub-
ing.
5. Replace the O-ring seals and lubricate with re-
frigerant oil prior to installing the valve using dis-
assembly procedure in reverse.
6. Evacuate, leak test and recharge the system.
F28714
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