TM 55-4920-394-13&P
Table 3-6. Trouble Shooting (cont' )
d
TROUBLE
PROBABLE CAUSE
REMEDY
Noisy
Contaminated fluid; ferrous
Check filter elements
Operation
(metal) particles in fluid
of high pressure filter,
(Continued)
fill system filter,
use clean filtered
fluid.
Defective boost pump
Check and replace, if
necessary.
Defective check valve (34, fig.
Inspect and replace, if
1-5) in high pressure line
necessary.
Pressure outlet closed or flow
Open bypass valve; or,
control valve and bypass valves
if pressure hose con-
closed
nected to outlet and
aircraft, flow control
valve.
Chattering high pressure relief
Remove valve and dis-
assemble, clean and
replace worn or defec-
tive parts.
Defective Pump Compensator (30,
Check and repair or
replace.
Insuffi-
Air in system
Bleed (Refer to para.
cient Back
2-4).
Pressure
Insufficient fluid supply from
Check aircraft reser-
aircraft reservoir
voir; add fluid by
using fill system (Re-
Fill stand system.
Control
Control circuit breakers OFF
Reset circuit breakers.
Circuit
Inoperative
Power on Switch OFF
Switch ON.
Faulty Control Circuit
Test and replace.
Test and replace; if
necessary.
Indicating
Defective Lamps (Refer to fig.
Test and replace.
Lights fail
1-6)
to glow on
"press to
Defective Switches (Refer to
Test and replace.
test"
3-16