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Table 3-3. Troubleshooting Chart
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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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SECTION V. MAINTENANCE PROCEDURES
TM 55-4920-442-13 & P
Table 3-3. Troubleshooting Chart (cont.)
MALFUNCTION
INSPECT
CORRECTIVE ACTION
Oil cooler inoperative
Defective cooler
Repair or replace. See
(cont.)
Para. 3-66 and 3-67.
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. Re-
move per Para. 3-55 and
replace if necessary.
Fill pump motor
Defective circuit
Replace faulty circuit
inoperative
breaker
breaker.
Overload activated
Reset or replace overload
as necessary. Check motor
for cause of fault. Re-
move per Para. 3-55 and
replace if necessary.
Control circuit
Fuse (1FU blown)
Replace fuse. Figure C-7,
inoperative
Item 9. Check for cause
of overload. Repair fault.
Improper phase sequence
Reverse any two input
leads.
Indicator lights do not
Fuse (2FU) blown
Replace fuse. Figure C-7,
illuminate
Item 25. Check light
sockets and wiring for
shorts.
Bulb(s) burned out
Replace bulb(s).
Electrical system
Broken, loose or
Check electrical circuits
failure(s)
grounded wires and
with electrical system
connections
schematic (Figure 1-3)
and wiring diagrams
Improper connections
Check electrical connec-
tions for 220 or 440 volt
input. See Figure 1-6.
3-11/(3-12 blank)

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