g. After engine starts, slowly close choke control (26)
operating procedures outlined in paragraph 3-4 apply to
until engine is operating normally with choke in fully closed
system testing and filling using the Test Stand reservoir as
source of hydraulic fluid. The operating procedures using the
aircraft reservoir as source of hydraulic fluid are the same as
h. Operate engine at 1000 to 1400 rpm as read on tach-
outlined in paragraph 3-4 except prior to operating procedures,
hourmeter (21, figure 3-1) for approximately 10 minutes to
close reservoir shutoff valve (1, figure 3-1).
warm engine up to normal operating temperatures.
3-6. PROCEDURES DURING OPERATION. During operation
i. Adjust engine throttle control (24, figure 3-1) until
of the Test Stand, periodically check the following:
1800 rpm is read on tach-hourmeter (21).
a. If fault indicators (5 or 10, figure 3-1) light, shut-down
Place fuel level gage switch (23) in ON position.
k. Observe engine oil pressure gage (22) for indication
b. Move pressure selector valve (12, figure 3-1) to
of proper oil supply to the engine. Shut down engine
FILTER INLET position and read system condition on gage (9).
immediately if oil pressure gage does not indicate proper oil
Shutdown unit if supply pressure is below 13" Hg Vac.
c. If an emergency should arise (ruptured hydraulic hose
3-4. VALVE AND CONTROL SETTINGS. Observe the
in aircraft, etc.) open bypass valve (19, figure 3-1) to relieve
following procedures in setting valves and controls:
pressure and stop flow of hydraulic fluid to aircraft.
a. Close 1/2 inch flow control valve (16, figure 3-1) and
d. Periodically check ammeter (2, figure 3-1) for
3/4 inch flow control valve (14).
condition of electrical system: fluid level indicator (8) for level of
fluid remaining in reservoir; fuel level gage (20) for amount of
Close compensator shutoff valve (18).
fuel remaining in tank, and engine oil pressure gage (22) for
condition of engine.
c. Open high pressure gage shutoff valve (3).
reservoir shutoff valve (1).
e. Check temperature of hydraulic fluid in system at
gage (11, figure 3-1). If temperature of fluid is above 160
d. Adjust pump delivery to requirements using volume
degrees F, open bypass valve (19) and allow fluid to circulate
until temperature drops. After temperature has reduced to
3-1). Turn handwheel of volume control clockwise to increase
operating range, close bypass valve and resume testing
delivery, counterclockwise to decrease delivery. A lever is
provided under the handwheel to securely lock volume control
3-7. STOPPING TEST STAND. Use the following procedure
to stop the Test Stand:
Close bypass valve (19, figure 3-1).
Open bypass valve (19, figure 3-1).
f. Adjust high pressure relief valve (17, figure 3-1) to
relieve pressure at approximately 200 psi above the system
Close flow control valve (14, or 16, figure 3-1).
pressure of the unit on test. Clockwise rotation of the relief
valve knob increases pressure setting, counterclockwise
c. Use throttle control (24, figure 3-1) to idle engine for 5
rotation decreases pressure setting. Accuracy of the setting
minutes to normalize engine temperature.
should be checked on aircraft instruments after start of testing.
Place ignition switch (25, figure 3-1) in OFF position.
g. Open compensator shutoff valve (18, figure 3-1) and
adjust compensator control (6, figure 1-3) until high pressure
3-8. PROCEDURES AFTER OPERATION. When testing
gage (6, figure 3-1) indicates pressure of the unit being tested.
operations have been completed and unit is shut-down,
Lock control in position with lock nut under knob.
perform the following steps to secure the Test Stand:
Open bypass valve (19, figure 3-1).
Close reservoir s hutoff valve (1, figure 3-1).
i. Place outlet selector valve (15, figure 3-1) in 1/2 inch
b. Do not connect or disconnect any hoses with bypass
or 3/4 inch outlet position.
valve (19) closed.
Open flow control valves (14 or 16, figure 3-1).
c. Disconnect and cap all external hoses.
protective caps on outlet ports.
k. Close bypass valve (19, figure 3-1) and proceed with
the test operation per manufacturer's specifications for the unit
d. Close control panel door and any other doors that
were opened during operation.
OPERATION WITH AIRCRAFT RESERVOIR.