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ARMY TM 9-4120-381-14
NAVY EE-000-CA-MMA-010/7053-AC
AIR FORCE TO 35E9-136-31
Table 5-1. Direct Support Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. BLOWN VALVE PLATE OR CYLINDER HEAD GASKETS.
Step 1. Cylinder head bolts not properly torqued.
a.
Replace cylinder head gasket (para 5-47).
b.
Retorque cylinder head bolts to 30-35 lb-ft.
Step 2. Liquid refrigerant floodback or flooded start. See malfunction 7.
4. COMPRESSOR CYCLES ON LOW-PRESSURE CONTROL.
Step 1. Low refrigerant pressure switch erratic in operation.
a.
Check tubing to switch to see if clogged or crimped (para 5-24).
b.
Check switch setting (para 5-24).
Step 2. Insufficient refrigerant in system.
Add refrigerant (para 5-17).
Step 3. Suction service valve closed.
Backseat (counterclockwise) suction service valve (para 5-34).
Step 4. Restricted air flow through condenser.
Clean condenser (para 4-90).
Step 5. Discharge service valve not fully open.
Backseat (counterclockwise) discharge service valve (para 5-33).
Step 6. Air in system.
Purge refrigerant system (para 5-13).
5. COMPRESSOR CONTINUALLY CYCLES.
Step 1. Faulty high refrigerant pressure switch.
Adjust or replace switch (para 5-23).
Step 2. Faulty low refrigerant pressure switch.
Adjust or replace switch (para 5-24).
Step 3. Faulty low oil pressure switch.
Adjust or replace switch (para 5-25).
Step 4. Condenser capacity reduced by refrigerant overcharge accompanied by high discharge pressure.
Remove overcharge (para 5-17).
Step 5. Plugged drier filter.
Replace drier filter (para 5-26).
5-3
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