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Section Ill. HYDRAULIC SYSTEM INSTRUMENTS
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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
Next
Figure 31. High pressure relief valve, epxloded view
The temperature gage accuracy can be checked
b. Removal.
by inserting the sensing element of an accurate
(1) Disconnect the electrical leads from
thermometer in the reservoir with test stand
the reservoir level indicator (2, fig. 9).
in normal operation and comparing the indi-
(2) Remove the nuts, lockwashers, and
cated temperatures. Replace a defective fluid
bracket that secure the indicator in
temperature gage as outlined below.
the control panel (1) and remove the
indicator.
b. Removal.
(1) Close the reservoir shutoff valve (12,
c. Installation.
fig. 9) and remove the plug in the bot-
(1) Position a new reservoir level indi-
tom of the low pressure filter draining
cator (2) in the control panel (1) and
fluid from the filter and manifold as-
secure with the bracket, lockwashers,
sembly.
and nuts.
(2) Remove the sensing element of the
(2) Connect the electrical leads to the
fluid temperature gage (4) from the
reservoir level indicator.
manifold.
146. Fluid Flow Indicator
(3) Remove the three nuts and screws (5)
a. Removal.
that secure the fluid temperature gage
(1) Disconnect the flexible cable that links
to the control panel (1) and remove
the fluid flow indicator (15, fig. 9) to
the temperature gage.
the pump.
c. Installation.
(2) Remove the four nuts and screws (14)
(1) Position a new fluid temperature gage
that secure the flow indicator to the
(4, fig. 9) in the control panel (1)
control panel (1) and remove the flow
and secure with the three screws (5)
indicator.
and nuts.
b. Installation.
Caution: Exercise extreme care in
(1) Position a new fluid flow indicator
handling the capillary tube and sens-
(15) in the control panel (1) and se-
ing element of the temperature gage.
cure with the four screws (14) and
T h e slightest kink may render the
nuts.
gage inoperative.
(2) Connect the flexible cable between the
(2) Install the sensing element of the fluid
fluid flow indicator and the pump.
temperature gage (4) in the manifold.
147. Fluid Temperature Gage
(3) Install the plug in the bottom of the
low pressure filter and open the reser-
a. Testing. A fluid temperature gage that
voir shutoff valve (12).
returns to ambient temperature indications
when the test stand is inoperative can be con-
(4) Bleed air from the hydraulic system
sidered to be in proper operating condition.
(par. 70).
Section IV. CONTROL VALVES AND PANEL
148. General
149. High Pressure Relief Valve
The various control valves of the hydraulic
a. Removal.
system are located on the control panel. When
(1) Disconnect the high presure filter-to-
these control valves become damaged or in-
relief valve tubing (11, fig. 12), high
operative they must be repaired or replaced as
pressure relief valve-to-manifold tub-
outlined in this section. After the removal of
ing (12), high pressure relief valve-to-
a control valve, inspect the interconnecting hose
snubber valve tubing (32), and the
assemblies or tubing for damage or obstructions
relief valve-to-bypass valve tubing
making certain the questionable control valve is
the source of trouble.
(38) .
AGO 5742A

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