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SECTION IV.  TROUBLESHOOTING
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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SECTION V.  MAINTENANCE PROCEDURES - TM-1-4920-446-13P_40
TM 1-4920-446-13 & P Table 3-6.  Troubleshooting Chart (Contd) Malfunction Inspect Corrective Action aircraft system specified. Check operating procedures in Chapter 2 High pressure relief If inoperative, replace valve valve. See para. 3-67, 3-68, and Figure C-10. .: High pressure relief Relief valve cone not If chattering persists, re- valve chattering seated properly due to place valve. See para. 3-68, dirt or foreign matter and Figure C-10. lodged between cone and seat Test stand inoperative Check main power cable Ensure cable end fully seated in receptacle. Ensure receptacle has electricity. Main circuit breaker Reset if tripped. CB1 . Fuse (F1) Remove and check fuse (F1). Replace if defective. Magnetic Starter Reset L1, L2, or L3 if tripped. Hydraulic pump motor Defective circuit Replace faulty circuit inoperative breaker breaker. Overload activated Reset or Replace overload (will shutdown test as necessary. Check motor stand) for cause of fault. Remove per para. 3-51 and replace if necessary. Control circuit inopera- Fuse (F1) If blown, replace fuse. tive Figure C-4. Check for use of overload.  Repair fault. Input wiring connected Check input wiring to ensure improperly it conforms to Figure 1-5 for 220 or 440 volts. Indicator lights do not Fuse (F1) If blown, replace fuse. Figure C-4. illuminate Check light sockets and wiring for shorts. 3-11

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