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12 - 12
System Diagnosis (cont'd)
Air in System
Gauge Readings:
Low Side Gauge -
High.
High Side Gauge -
High.
Other symptoms:
Sight Glass -
Bubbles visible during system
operation.
Pipes -
Low pressure pipes are hot to the touch.
Diagnosis:
Air is present in the system, possibly from
inadequate evacuation procedure.
Correction:
1.
Evacuate A/C system.
2.
Check compressor oil for contamination. Check
compressor for proper oil amount. Correct if
necessary.
3.
Charge system with R-134a.
4.
Operate system and check performance.
Expansion Valve Improperly Mounted or Heat
Sensing Tube Defective (Opening Too Wide)
Gauge Readings:
Low Side Gauge -
High.
High Side Gauge -
High.
Other symptoms:
Pipes -
Large amount of frost or moisture on low side
pipes.
Diagnosis:
Excessive refrigerant in low side pipes possibly
from expansion valve being opened too wide.
Correction:
1.
Leak test system.
2.
Evacuate A/C system.
3.
Repair system leaks.
4.
Charge system with R-134a.
5.
Operate system and check performance.
LOW SIDE (RED)
HIGH SIDE (BLUE)
High
High
Section B
Body & Framework
9803/6410
Section B
12 - 12
Issue 1
Air Conditioning
LOW SIDE (RED)
HIGH SIDE (BLUE)
High
High
LOW SIDE - 2.8 bar (2.8 kgf/cm
2
)(40 lbf/in
2
)
HIGH SIDE - 22.1 bar (22.5 kgf/cm
2
)(320 lbf/in
2
)
LOW SIDE - 3.5 bar (3.5 kgf/cm
2
)(50 lbf/in
2
)
HIGH SIDE - 22.1 bar (22.5 kgf/cm
2
)(320 lbf/in
2
)
50
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A268070
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0
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A268080
Summary of Contents for JS130
Page 65: ...Section 3 Section 3 9803 6410 Issue 1 9 1 9 1 Routine Maintenance Component Location Diagram...
Page 118: ......
Page 119: ...3 1 Section C Electrics 9803 6410 Section C 3 1 Issue 1 Layout Operator s Cab...
Page 142: ...5 3 Section C Electrics 9803 6410 Section C 5 3 Issue 1 Pump Control FLOW CHART...
Page 207: ......
Page 209: ......
Page 210: ...3 4 Section E Hydraulics 9803 6410 Section E 3 4 Issue 2 Schematics Shuttle Block...
Page 532: ...Contents Page No Technical Data 1 1 i Engine 9803 6410 i Issue 1 Section K Section K...