TM 55-4920-428-13
ap (Fig. 2-3.) On the electrical unit, press the SOLENOID SHUTOFF switch to CLOSE. The OPEN light
shall go out and the CLOSE light shall come on. On the hydraulic unit, the SOLENOID valve light shall go out.
aq On the hydraulic unit, push the SOLENOID valve to CLOSED.
2-9. High Pressure Self-Test.
The high pressure self-test must be performed prior to test set operation to ensure satisfactory operation of the
hydraulic unit SOLENOID valve and HIGH PRESS RELIEF VALVE. Proceed as follows:
a. Perform the preparation for use procedures (para 2-6).
b. Perform the self test procedures (para 2-7),
c. Perform the fill and bleed procedures (para 2-8).
d. Check that the switches and valves are at their initial settings (tables 2-1 and 2-2).
e. Adjust the shop hydraulic power supply for 2600 psi. Open the supply needle valve.
f. (Fig. 2-3.) Rotate the HIGH PRESS REGULATOR to full INCREASE. Observe the HIGH PRESS gage
for one minute. The pressure indication shall not increase.
g. Rotate the HIGH PRESS REGULATOR to full DECREASE.
h. (Fig. 2-2.) Set the electrical unit POWER switch to ON. The LAMP TEST switch POWER light shall
come on.
i. Press the electrical unit SOLENOID SHUTOFF valve switch to OPEN. The switch OPEN light shall come
on and the CLOSED indicator light shall go out.
j. (Fig. 2-3.) Open the hydraulic unit SOLENOID valve. HIGH PRESS and LOW PRESS gages shall indicate
pressure.
k. Rotate the HIGH PRESS REGULATOR toward INCREASE until the HIGH PRESS gage indicates 1000
psi,
1. Rotate the HIGH PRESS SHUTOFF VALVE to OPEN.
m. Push on the HIGH PRESS RELIEF VALVE. Fluid flow through the valve shall be heard. Release the
valve.
NOTE
At this point the test set is ready for use. If components are to be
mounted for testing, perform normal shutdown (para 2-10).
NOTE
The test set is ready for use. If ILCA or extensible link tests are to be per-
formed, refer to the test procedures in TM 55-1520-240-23.
2-10. Normal Shutdown Procedures.
Normal shutdown procedures shall be followed when component test procedures are complete and no other test
procedures are scheduled or when shutdown is required during test operations. Proceed as follows:
a. (Fig. 2-2.) Check that the electrical unit CYCLE MOTOR switch is at OFF. (See fig. 2-3.) Position the cy-
cle motor linkage in stored position.
b. Check that the hydraulic unit HIGH PRESS REGULATOR is at full DECREASE.
c. Rotate the HIGH PRESS SHUTOFF VALVE to CLOSE.
d. Set both ILCA PRESS and SAS PRESS valves to VENT.
e. (Fig. 2-6.) Reduce the shop hydraulic supply pressure to zero and close the supply (pressure) valve.
Change 3
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