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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
11. OIL PRESSURE LOWER THAN NORMAL OR NO OIL PRESSURE - Continued.
Step 3. Worn oil pump.
Replace oil pump assembly (para 5-48).
12. COMPRESSOR MOTOR PROTECTORS TRIPPING OR CYCLING
Step 1. High discharge pressure.
Check operation of condenser fan (para 4-77) and clogged condenser coil, contact General Support
Maintenance.
Step 2. Defective overload K23 or K24 relay.
Replace defective relay (para 5-52).
Step 3. High suction temperature.
Improperly set liquid quench valve (para 5-36) or hot gas bypass valve (para 5-37), adjust valves.
Step 4. Loose power or control circuit wiring connections.
Check all power and control circuit connections (Figure FO-3).
Step 5. Defective compressor motor.
Check motor windings for short to ground (see malfunction 14).
13. COMPRESSOR CYCLES ON LOCKED ROTOR.
Step 1. Low line voltage.
Check line voltage and determine location of voltage drop (para 4-13).
Step 2. Seized compressor. Remove pump end bearing assembly and attempt to rotate eccentric shaft (para 5-
48).
Replace compressor (para 5-46) if eccentric shaft does not turn.
Step 3. Defective compressor motor.
Check motor windings for short to ground. (See malfunction 14.)
Step 4. Single phasing.
a.
Check voltage across all three legs at compressor contactor K10 (para 4-51 and Figure FO-3). If incorrect,
correct source of problem.
b.
Check input voltage to RFI box (para 4-42).
Step 5. Liquid refrigerant condensing in cylinder.
Check and replace valve plates (para 5-47).
5-6
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