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TM-55-4920-226-15 Test Stand Aircraft Hydraulic AHT-5A-1 Type D-5A Manual
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Section IV. OPERATION UNDER UNUSUAL CONDITIONS - TM-55-4920-226-150020
increase delivery, counterclockwise to decrease
(8) Set the throttle control (4) for an
delivery. Tighten the knurled locknut to secure
engine speed of 1800 rpm indicated by
the fluid volume control in position.
the tachometer (9, fig. 9). Rotate the
throttle clockwise to lock it in adjust-
d. Set the outlet selector valve (16) for the
ment.
desired size outlet.
c. Manual Starting.
e. Slowly close the fluid bypass valve (27).
(1) Perform procedures in b (1) through
Warning: Do not connect or disconnect any
(4) above.
hoses with the fluid bypass valve closed and
(2) Insert the starting crank in the access
the test stand in operation.
hole in the front panel assembly (5,
Caution:  Do not reposition the outlet se-
fig. 1).  Engage the starting crank
lector valve with the fluid bypass valve closed
with the pin provided in the crank
and the test stand in operation.
shaft and pull up on the crank.
f. Adjust the high pressure relief valve (17)
Warning: When using the starting
to relieve pressure at approximately 200 psi
crank, keep the thumb on the same
above the system pressure of the unit under
side of the crank handle as the fingers
test. Clockwise rotation of the relief valve
t o avoid injury should the engine
knob increases pressure setting, counterclock-
kickback. Never attempt to spin the
wise rotation decreases pressure setting.
engine with the starting crank.
g. Adjust the compensator control (25) until
(3) Open the choke control until the en-
the fluid pressure gage (3) indicates pressure
gine operates smoothly.
slightly higher than the maximum pressure of
the system being tested.
(4) After sufficient warm up, set the
throttle for an engine speed of 1800
Caution:  Adjust the compensator control
rpm.
for a zero reading on the fluid pressure gage
when the compensator is not in use.
42. Stopping the Test Stand
h. Open the flow control valves (20 and 21)
a. Open the fluid bypass valve (27, fig. 9) by
and proceed with. the test operation as directed
turning handle of the valve fully counterclock-
by the manufacturer's specifications for the
wise.
system under test.
b. Close the flow control valves (20 and 21).
44. Movement to a New Work Site
c. Idle the engine for 5 minutes to normalize
a. Shut down and disconnect the test stand
engine temperature.
from the system being tested (par. 42). Coil
d. Place the ignition switch (1, fig. 10) in
the hose assemblies. and stow them in the rear
the OFF position and close the reservoir shutoff
compartment of the test stand.
valve (12, fig. 9).
b. Close and secure all doors and release the
brake lever assembly (8, fig. 1).
43. Operating Details
c. Attach the drawbar assembly (3, fig. 1 )
a. Close the two flow control valves (20 and
to the prime mover and tow the test stand to
the new work site.
b. Open the gage snubber valve (23).
Caution: Maximum allowable towing speed
c. Adjust the pump delivery to requirements
is 20 mph over smooth paved surfaces.
of the aircraft under test with the fluid volume
d. Set up the test stand for operation in ac-
control (29) as indicated by the fluid flow indi-
cordance with instructions in paragraph 41.
cator (15). Turn the hand wheel clockwise to
AGO 5742A

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