Operating instructions

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-
valve (31, fig. 1-5) assemble, clean and
replace worn or defec-
tive parts.
Defective Pump Compensator (30, Check and repair or
fig. 2-1) 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-
fer to para. 2-4).
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.
transformer (fig. 1-6)
Defective Relays 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" fig. 1-6)
3-16