TM 55-1520-240-23-6
7-269.1
TEST 145HS775 RAMP CONTROL VALVE (AVIM)
(Continued)
7-269.1
NOTE
The following tests must be made with
hydraulic fluid (E199) at 80º to 120ºF.
45.
Perform internal leakage checks as follows. Allow
2 minutes following each pressure application
before leakage rate is measured.
a.
Check internal leakage with ramp control
valve handle (16) in position 2 (stop) as
follows:
(1)
Install pressure caps (13, 12, and 11) on
ports C1, C2, and C3.
(2)
Connect pressure line (17) to pressure
port P. Leave return port R (20) open.
(3)
Set power supply to 28 vdc, ramp control
valve test set PWR switch (22) to ON, and
SOLENOID VALVE SELECT switch (23)
to BOTH. Both UP and DN SOL lights (25
and 26) shall come on.
(4)
Apply 3350 psig to pressure line (17) in
pressure port P. Handle (16) shall remain
in position 2. Leakage from return port R
(20) shall not exceed 10 dpm.
(5)
Remove pressure from ramp control valve
(2), and remove caps from ports C1 (28)
and C2 (29). Cap (11) shall remain on
port C3.
(6)
Set ramp control valve test set PWR
switch (22) to OFF. UP and DN SOL
lights (25 and 26) shall go off.
(7)
Apply 3350 psig to pressure line (17) in
pressure port P. Leakage from ports C1
(28) and C2 (29) shall not exceed 1 dpm.
7-1005
