TM 55-4920-384-13&P
ation, the normal reading should be on the charge
e. Choke Control. The choke control (21, Fig. 1-
side of the 0.
9) located on the engine control panel, is a manually
operated control that closes the butterfly in the car-
1. Flow Control Valve. The 1/2 inch flow con-
buretor, enriching the fuel mixture for starting a
trol valve (17, Fig. 1-9) located on the center of the
cold engine.
control panel, may be used to control the flow of hy-
draulic fluid from the hydraulic test stand.
f. Throttle Control. The throttle control, (22
Fig. 1-9) located on the
engine control panel, is a
m. Fluid Volume Control. The fluid control
push-pull, twist lock control used to set the gover-
(18, Fig. 1-9) is located on center of the control pan-
nor for the desired engine RPM.
el. This control positions the cam plate of the pump
to obtain the desired volume output. The adjusted
g. Ignition Switch. The ignition switch (23,
Fig. 1-9) is
mounted in the
upper center of the
en-
gine control panel. When in OFF position, the igni-
tion switch grounds the magneto thus stopping the
Fig. 1-9) mounted on the
left of the
control panel,
engine. In the ON position, which is the engine run
indicates hydraulic pump delivery. The indicator
position, the magneto is ungrounded also, acces-
dial graduated in 1/2 gallon increments from 0 to 10
sories are energized.
gpm.
h. Starter Switch. The starter switch (24, Fig.
o. High Pressure Relief Valve. The high pres-
1-9) mounted on the engine control panel, is a
sure relief valve (19, Fig. 1-9) located in the center
spring loaded, push-typeswitch. When pressed in-
of the control panel, is an adjustable by-pass type
ward it energizes the armature relay which in turn
relief valve with an operating range from 400 to
completes the electrical circuit between the battery
5000 psi. This valve serves as a safety device, pro-
and the starter.
tecting the hydraulic system under test from exces-
sive pressure.
meter (9, Fig. 1-9) mounted on the test stand control
p. Compensator Control. The compensator
panel, is a dual indicating instrument. The tachom-
control (16, Fig. 1-9) located in the center of the con-
eter is a needle indicating, direct- reading instru-
trol panel, is adjusted for the desired discharge
ment graduated from 0 to 2500 RPM in increments
pressure of the test stand. A locknut is provided to
secure the control in adjustment.
RPM. The normal operating speed is approximately
1800 RPM. The hour meter indicates running time
q. Fluid Pressure Gage. The fluid pressure
of the engine and is displayed digitally to the near-
gage (6, Fig. 1-9) mounted on the instrument con-
est 1/100 of an hour. The displayed time is the time
trol panel, is a needle-indicating, direct-reading,
base for all maintenance performed on the engine
pressure actuated gage. The dial is graduated from
and test (stand filter change, oil change, periodic in-
0 to 6000 psi in increments of 100 psi. When the test
spection etc.).
stand is in operation the fluid pressure gage indi-
cates the discharge pressure selected by the com-
j. Oil Pressure Gage. The oil pressure gage (7,
pensator control.
Fig 1-9) located on the
instrument control panel, is
a needle-indicating, direct-reading, pressure, actu-
r. Gage Snubber Valve. The gage snubber
ated gage with the dial marked OFF, XX and ON.
valve, located below the pressure gage on the back
Normal oil pressure is indicated when the needle is
side of the test stand control panel, is orifice type
between XX and ON ranges.
valve provided to prevent pressure surges to the
fluid pressure gage.
k. Ammeter. The
ammeter (10, Fig. 1-9) moun-
ted on the instrument control panel, is a needle indi-
cating, direct-reading, electrically actuated instru-
s. Gage Test. The
gage test port (5, Fig. 1-9) ex-
ment. The dial is graduated in a 60-0-60 ampere
tending through the test stand instrument control
scale. The ammeter indicates the amount of current
panel, is provided for the connection of a test pres-
flowing to the battery. With the engine in oper-
sure gage to check the accuracy of the fluid pres-
sure gage.