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Page Title: Table 5-1. Direct Support Troubleshooting
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ARMY TM 9-4120-381-14 NAVY EE-000-CA-MMA-010/7053-AC AIR FORCE TO 35E9-136-31 · Do not operate the equipment without all panels and covers In place and tightly secured. · Do not be misled by the term "low voltage." Potentials as low as 50 volts may cause death under adverse conditions. Table 5-1.  Direct Support Troubleshooting MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 1.  COMPRESSOR WILL NOT START. Step 1.  Power off. a. Check to see if circuit breaker CB1 is tripped (para 4-62) and reset circuit breaker. b. Check main fuses and wiring (para.4-42), repair or replace as necessary. Step 2.  Current overload open. a. Check K23 and K24 current overloads (para 5-52) in compressor (B2) electrical box for open (see Figure FO-3.) b. Replace current overload if K23 or K24 are open (para 5-52). Step 3.  Oil safety switch open. Reset low oil pressure switch (S7) manually (para 5-25). Step 4.  Check for loose electrical connections or faulty wiring (para 5-50).. Tighten connections.  Check wiring and rewire if necessary. Step 5.  Compressor motor burned out. Check and replace compressor if defective (para 5-46). 2.  LOW COMPRESSOR CAPACITY OR INABILITY TO PULL DOWN SYSTEM. Step 1.  Blown valve plate or cylinder head gasket. See malfunction 3. Step 2.  Leaky valve plates or worn valve seats. Replace valve plate assembly (para 5-47). Step 3.  Leaky suction valves. Replace suction valves (para 5-47). Step 4.  Broken connecting rods or pistons. a. Replace connecting rods and pistons (para 5-49), replace if necessary. b. Check rods, pistons, and cylinder tolerances (para 5-49). c. Replace compressor (para 5-46) if any cylinder bore is out of tolerance. 5-2

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