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TM 55-4920-373-14&P
5. Slowly close the high pressure bypass
8. Open choke slowly by pushing control in
valve (item 2, figure 2-1) turning handle in CW
until engine is running normally with the choke
pushed in toward the fully open position.
6. Adjust high pressure relief valve (item 1,
9. Adjust engine speed between 1000 and 1400
figure 2-1) to relieve pressure at approximately
RPM as indicated by tachometer (item 6, figure
200 psi above the maximum system pressure of
2-1) using throttle. Run engine for approximately
the system under test.  Pressure will be indicated
ten minutes to warm engine up to normal operating
by the fluid pressure gage (item 9).
7. Open compensator shutoff valve (item 22,
10. Observe normal oil pressure. This is in-
figure 2-1) fully, turning control CCW. The fluid
dicated by the oil pressure gage (item 5, figure
pressure gage (item 9) will drop to some low
2-1) which shall indicate between XX- and -ON,
or in the ON position.
8. Adjust the pressure compensator control
11. Observe ammeter (item 8, figure 2-l).
(item 21, figure 2-1) in a CW direction as re-
The ammeter should indicate slightly to right
quired, until the fluid pressure gage (item 9)
from center of scale.
indicates a pressure slightly higher than the
maximum of system pressure under test. Lock
12. After engine warm -up, increase engine
the control knob in this position.
speed using throttle, to 2000 RPM as indicated
by the tachometer and lock throttle.
9. Open the high pressure bypass valve (item
2, figure 2-1) by turning control CCW.
2-11. OPERATION. (See figure 2-1.)
10. Dependent upon the mode of operation,
2-12. Set the test stand into operation as follows:
(see section IV, paragraph 2-8) position the flow
control valves as required.
11. Close the high pressure bypass valve
(item 2, figure 2-1) by turning CW and proceed
Review applicable manuals for the system
under test. Always observe the fluid
with applicable test procedures as specified.
pressure gage and suction pressure gage
for erratic or abnormal indication.
12. It may be necessary to readjust the flow
control valve, pressure compensator and volume
control to obtain exact conditions.
Do not connect or disconnect hoses while
system is under pressure or with fluid
2-13. To shutdown the test stand, proceed as
by-pass valve in the closed position.
1. Open the high pressure bypass valve (item
2, figure 2-1) by turning control CCW.
Do not reposition outlet selector valve
with fluid by-pass valve in the closed
2. Reduce the system pressure under test by
turning pressure compensator control (item 21,
1. Assure that all valves are positioned as
figure 2-1) CCW and as indicated by fluid pressure
described in paragraph 2-6.
gage (item 9).
2. Position the outlet selector valve (item 17,
3. Close both flow control valves (item 16
figure 2-1.) to the l/2-inch outlet, or the 3/4-
and 19, figure 2-1) by turning CW.
inch outlet, as required, for the mode estab-
lished for operation.
4. Idle the engine of test stand for approxi-
3. Close the compensator shut-off valve (item
mately five minutes.
22, figure 2-1) turning it CW.
5. Set the ignition switch (item 2, figure 2-2)
to OFF.
4. Adjust pump volume control (item 20,
figure 2-1) to desired GPM as indicated by the
6. Remove hoses between test stand and sys-
fluid flow indicator (item 10) turning handle CW
tem under test.
to increase flow and CCW to decrease flow. Lock
pump volume control (item 20) after obtaining
desired flow.
Change 1 2-9

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