TM 5-6115-590-12 Table 4-2.  Troubleshooting - Continued MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 13.   LOSS OF OIL PRESSURE. Step 1. Check oil supply. Check  oil  tank  dipstick  for  proper  oil  level. Replenish oil as required. Step 2. Check oil pump pressure relief valve. Replace pressure relief valve.  (fig.  4-47) Step 3. Check oil lines for kinks or damage. Replace damaged oil line. Step 4. Check oil filter element. Replace oil filter element.  (fig.  4-47) 14.   LOAD CONTROL VALVE FAILS TO OPEN. Step 1. Refer to fig.  2-14 for operation to deliver 400 Hz power. Replace failed components as required. Step 2. Check solenoid valve. Replace solenoid valve.  (fig.  4-28) Step 3. Check air pressure regulator valve. Refer    to    paragraph    4-14e(5)    for    adjustment procedure. Replace Filter element. Replace air pressure regulator assembly.(fig.4- 28) Step 4. Check load control thermostat adjustment. Refer  to  paragraph  4-14e(2)  for  adjustment procedure. Replace failed thermostat.  (fig.  4-28) Step 5. Check control air line and fittings for leaks. Tighten as required, or replace damaged line. Step 6. Check load control valve. Replace load control valve.  (fig.  4-28) 15.   NO 68 HZ AC GENERATOR OUTPUT (60 Hz trip indicator lamp D55 illuminated) Step 1. Check for overload on output. Adjust  load,  reset  load  contactor  switch  S3 and  check  each  phase  with  60  Hz  volt-amp switch S25. Step 2. Check 60 Hz load contactor switch S3. Replace switch.  (fig.  4-21) Step 5. Check under frequency arming relay K6. Refer  to  paragraph  4-58f(3)  to  check  for  K6 relay failure.  Replace relay.  (fig.  4-37) Step 4. Check 60 Hz generator control relay K8. Replace relay.  (fig.  4-37) Step 5. Check 60 Hz output contactor relay K11. Replace relay.  (fig.  4-39) Step 6. Check voltage regulator VR2. Refer   to   paragraph   4-58d(3)   to   check   for failed regulator. Step 7. Check 60 Hz protective panel. Refer to paragraph 58g(3) to check for failed protective panel. Replace protective panel. Step 8. Check 60 Hz AC generator. Refer     to     paragraph     4-61     to     check     for generator failure. Replace generator.  (Para.  4-60) MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 16.   NO 400 HZ GENERATOR OUTPUT. Step 1. Check for overload on output. Adjust   load.      Reset   contactor   (K12)   (Contactor   is thermal, wait 10 seconds to reset).  Check each phase with volt-amp switch. Step 2. Check 400 Hz output contactor (K12) Replace contactor.  (fig.  4-38) Step 3. Check 400 Hz output contactor switch (S9). Replace contactor switch (S9).  (fig.  4-21) Step 4. Check 500 Hz main contactor (K10). Replace contactor (K10).  (fig.  4-37) Step 5. Check 400 Hz main contactor switch (S2) Replace contactor sprites (S2).  (fig.  4-21) Step 6. Check under frequency arming relay (K6). Replace relay (K6).  (fig.  4-37) Step 7. Check 400 Hz generator control relay (K7). Replace relay assembly.  (fig.  4-37) Step 8. Check 400 Hz auxiliary main contactor relay(K9). Replace relay (K9).  (fig.  4-37) Step 9. Check voltage regulator (VR1). Replace voltage regulator (VR1).  (fig.  4-37) Step 10. Check 400 Hz protective panel. Refer  to  paragraph  4-58d(3)  to  check  for  protective panel failure. 17.   NO WATER AT WATER SYSTEM OUTLETS. Step 1. Check water supply. Replenish water supply. Step 2. Check water system is properly primed. Refer to paragraph 4-2b(5) for priming instructions. Step 3. Check for 400 Hz power. Replace components as required. Step 4. Check 400 Hz auxiliary main contactor (K9). Replace main contactor (K9).  (fig.  4-37) Step 5. Check hot water pump contactor (K15). Replace contactor (K15).  (fig.  4-38.7) Step 6. Check circuit breakers (CB6), (CB12) or (CB11). Reset  circuit  breakers  or  replace  circuit  breakers  as required.  (fig.  4-21) 18.   NO HOT WATER. Step 1. Check exhaust gas flow control valve (K14). Replace control valve (K14).  (fig.  4-29) Step 2. Check hot water temperature switch (S12). Replace temperature switch (S12).  (fig.  4-26) Step 3. Check pressure switch (S11). Replace Switch (S11).  (fig.  4-26) Step 4. Check 400 Hz auxiliary main contactor relay (K9). Replace relay (K9).  (fig.  4-37) Step 5. Check pressure regulator. Replace regulator.  ( fig.  4-26) Step 6. Check hot water pump (B15) Replace hot water pump  (fig.  4-26) 4-23