Table 3-3. Troubleshooting (Cont) - TM-5-6115-545-12

Table 3-3. Troubleshooting (Cont) - TM-5-6115-545-12_157

TM-5-6115-545-12 Power Unit Utility Pack Gas Turbine Engine Driven (Air Research Model PPU85-5) Non-Winterized and (Air Research Model PPU85-4) Winterized Manual
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MALFUNCTION 23. 24. 25. 26. 27. 28. Engine generator set shuts down, HIGH COOLANT TEMP indicator illuminates but coolant tempera- ture is normal. Engine generator set shuts down, low oil pressure indicator illuminates, but oil pressure is normal. Engine generator set shuts down, over - speed indicator il- luminates, but engine speed is normal. All meters read cor- rectly except volt - meter reads off scale high. Circuit breaker switch is closed and indicator does not light. Main AC contactor (CB2) will not close. Table 3-3. Troubleshooting (Cont) PROBABLE CAUSE Defective coolant temperature switch. Defective oil pressure switch. Defective overspeed switch. Defective voltage adjust rheostat. a. b. Defective load circuit breaker switch. Lamp burned out. Main AC contactor (CB2) defective. CORRECTIVE ACTION Replace switch (para 3-209). Replace switch (para 3-194). Replace switch (para 3-186). Replace rheostat (para 3-110). a. Replace circuit breaker switch (para 3-117). b. Replace lamp (para 3-26). Measure continuity of coil pins A and B. If no continuity, replace contactor (para 3-141). 3-26 Change 8

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