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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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