TM 55-1520-240-23-6
7-269.1
TEST 145HS775 RAMP CONTROL VALVE (AVIM)
(Continued)
7-269.1
b.
Check internal leakage of ramp control valve,
with handle (16) in position 1 (down) as
follows:
(1)
Install pressure caps (13, 12, and 11)
on ports C1, C2, and C3, and connect
pressure supply line (17) to pressure port
P. Keep return port R (20) open.
(2)
Set ramp control valve test set PWR
switch (22) to ON, and SOLENOID VALVE
SELECT switch (23) to DN. DN SOL light
(26) on test box shall come on.
(3)
Apply 3350 psig to pressure line (17)
in pressure port P. Ramp control valve
handle (16) shall move into position 1.
Leakage from return port R (20) shall not
exceed 10 dpm.
(4)
Keep ramp control valve handle (16) in
position 1 and set PWR switch (22) to
OFF. Leakage from return port R (20)
shall not exceed 10 dpm.
c.
Continuing from last test, check internal
leakage of ramp control valve with handle
(16) in position 3 (up) as follows:
(1)
Set ramp control valve test set PWR
switch (22) to ON, and SOLENOID VALVE
SELECT switch (23) to UP. UP SOL light
(25) on test set shall come on. Ramp
control valve handle (16) shall move into
position 3. Leakage from return port R
(20) shall not exceed 10 dpm.
(2)
Keep ramp control valve handle (16)
in position 3 and set PWR switch (22)
to OFF UP SOL light (25) shall go off.
Leakage from return port R (20) shall not
exceed 10 dpm.
7-1006
