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Table 3-5.  Lubricants
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TM-1-4920-446-13P Hydraulic System Test Stand Type D-8A P/N 7459 Manual
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Table 3-6.  Troubleshooting Chart (Contd)
TM 1-4920-446-13 & P SECTION IV.  TROUBLESHOOTING 3-13.    Troubleshooting.    In  the  event  that  operation    of  the  test  stand  becomes    faulty  or  erratic,  refer  to  the  trouble- shooting chart, Table 3-6; to aid in isolating and correcting troubles. Table 3-6.  Troubleshooting Chart Malfunction Inspect Corrective Action Failure of high pressure Low fluid content in Refill reservoirs to specified. pump. test stand or aircraft reservoirs. Note: Low boost pres Air leak in boost pump Check and tighten all fittings. sure will shutdown test intake line stand Mechanical failure of pump. Replace pump.  See para. 3-63. Shaft seal leakage of Replace pump See para. 3-63. pump. Pump fails to deliver Incorrect operating Check correct operating pro sufficient volume procedures cedure. See Chapter 2. Also check volume control. See para. 3-64. Pump seizure due to Maintain adequate supply of lack of fluid supply hydraulic fluid in test stand or aircraft reservoirs. Replace pump. See para. 3-63. Defective high pres Remove and service or re sure relief valve place. See para. 3-67, 3-68, and Figure C-10. Pump fails to compen Incorrect operating Check correct operating pro- sate procedure cedure. See Chapter 2. Pressure Compensator Replace compensator valve valve inoperative (Figure 1-4) on control panel. See para. 3-68 Test stand fails to High pressure relief Replace valve. See para. develop sufficient pres valve sticking or 3-67, 3-68, and Figure C-10 sure scored System pressure too Compensator improperly Adjust pressure compensator high adjusted valve to correct setting for 3-10

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