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Page Title:
Table 3-3. Troubleshooting Chart |
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 TM 55-4920-442-13 & P
Table 3-3. Troubleshooting Chart (cont.)
MALFUNCTION
INSPECT
CORRECTIVE ACTION
Test stand fails to
High pressure relief
Disassemble high pressure
develop sufficient
valve sticking or
relief valve and check for
pressure
scored
scoring, dirt or gum which
may cause sticking. Clean
valve parts thoroughly
with solvent and re-
assemble. If inoperative
upon reassembly, replace
valve. See Para. 3-71,
3-72, 3-73 and Figure C-14.
System pressure too
Compensator control
Adjust compensator to
high
improperly adjusted
correct setting for air-
craft system specified.
Check operating procedures
in Chapter 2.
High pressure relief
Disassemble relief valve
valve spool remaining
and check freedom of
inoperative
spool. If not operative,
replace valve. See Para.
High pressure relief
Relief valve cone not
Disassemble relief valve
valve chattering
seated properly due to
and check both control
dirt or foreign matter
cone and seat for presence
lodged between cone
of dirt, gum or foreign
and seat
matter. Clean thoroughly
and reassemble. If chat-
tering persists, replace
valve. See Para. 3-72,
3-73 and Figure C-14.
Oil cooler inoperative
Fan blade loose on shaft
Tighten blade.
Foreign material
Clear foreign material
blocking fan rotation
from cabinet.
Defective cooler fan
Replace cooler fan motor.
motor
Defective circuit
Replace circuit breaker.
breaker
See Figure C-7, Item 6.
Overload heater
Reset or replace
activated
heater as necessary.
See Figure C-7, Item 22.
3-10
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