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TABLE 3-2. TABLE OF LUBRICANTS
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TM-55-4920-442-13-P Aircraft Hydraulic System Test Stand Trailer Mounted Type MK-1 Manual
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Table 3-3. Troubleshooting Chart
TM 55-4920-442-13 & P
SECTION IV. TROUBLESHOOTING
3-13.  Troubleshooting.  In the event that operation of the test stand becomes faulty or erratic, refer to the
troubleshooting chart, table 3-3; to aid in isolating and correcting troubles.
Table 3-3. Troubleshooting Chart
MALFUNCTION
INSPECT
CORRECTIVE ACTION
Failure of high
Low fluid content in
Refill reservoirs to
pressure pump
test stand or aircraft
specified level.
reservoirs
Note: Low boost
Air leak in boost pump
Check and tighten all
pressure will shut
intake line
fittings.
down test stand
Boost pump not primed
Bleed air thoroughly from
cooler and filters.
Mechanical failure of
Replace pump. See
pump
Shaft seal
leakage of pump
Replace pump. See
Pump fails to deliver
Incorrect operating
Check correct operating
sufficient volume
procedures
procedure. See Chapter 2.
Also check volume control.
Pump seizure due to
Maintain adequate supply
lack of fluid supply
of hydraulic fluid in test
stand or aircraft reser-
voirs. Replace pump. See
Defective high
Remove and service or
pressure relief valve
replace. See Para. 3-71,
3-72, 3-73 and Figure
C-14.
Pump fails to
Incorrect operating
Check correct operating
compensate
procedure
procedure. See Chapter 2.
Compensator assembly
Disassemble compensator
inoperative
assembly; check parts;
clean and reassemble.
See Para. 3-68, 3-69 and 3-
70.
Change 1 3-9

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