TM 55-1730-229-12
TO 35C2-3-473-1
(4)
(2)
Observe temperature gauge (item 4, fig-
Verify that RESERVOIR selector valve
ure 2-18) for an increase of approximately 10 degrees.
(item 6, figure 2-15) is set to AGPU, RETURN/BYPASS
valve (item 7 figure 2-15) is set to BYPASS, and the
dual manifold BYPASS/FLUSH valve is closed.
(5)
Repeat steps (3) and (4) until fluid temper-
ature is high enough to illuminate the SYSTEM READY
(3)
light (item 5, figure 2-18) (at 70 degrees F).
Set OUTPUT switch (item 14, figure 2-15)
to ON.
(6)
Close the HIGH PRESSURE BYPASS
(4)
valve (item 1, figure 2-18).
Set hydraulic pressure by placing PRES-
SURE switch to the INCREASE position until pressure
reaches 2500 PSIG as indicated on the OUTPUT PRES-
(7)
Ensure that hydraulic load connections
SURE gauge.
have been made as described in paragraph 2-7a.
(5)
Open BYPASS/FLUSH valve on the Dual
(8)
Set OUTPUT switch (item 6, figure 2-18)
Service Manifold until pressure drops to 2000 psig.
to ON and observe that output light illuminates. (This
opens the load select valve that applies AGPU hydraulic
(6)
power to the dual manifold).
Continue operations for approximately 5
minutes. If the hydraulic module has not been operated
in the last 30 days or if contamination is suspected, con-
(9)
Open the BYPASS/FLUSH (smaller)
tinue operation for 30 minutes.
valve (item 5, figure 2-16) on the side of the dual
manifold turn. The SYSTEM READY light (item 5,
WARNING
because of temperature drop caused by cold hose fluid.
(10)
Wait until SYSTEM READY light (item 5,
Failure to reduce system pressure prior to shut-
figure 2-18) illuminates.
ting down the hydraulic power can cause dam-
age to the pressure compensator motor on the
(11)
Close the BYPASS/FLUSH (smaller)
hydraulic pump and the limit switch.
valve (item 5, figure 2-16) on the dual manifold.
Reduce system pressure to 500 - 700 psi.
(7)
(12)
Set OUTPUT switch (item 6, figure 2-18)
to OFF (down position) and observe that output light
(8)
Set OUTPUT switch to OFF.
goes out.
(9)
Set RETURN BYPASS position to OFF. If
(13)
Hold PRESSURE switch (item 3, figure
dual servicing is required go to step 13.
OUTPUT PRESSURE gauge (item 7, figure 2-18). Re-
(10)
Remove the cap from the high-pressure
duce pressure to 500 psig.
GSE port on the aircraft to be serviced. Disconnect the
high-pressure adapter hose from the dual manifold and
e.
Dual Manifold/Aircraft.
immediately connect to the aircraft without putting the
connector down or exposing it to contamination.
WARNING
Remove the cap from the return ground
(11)
ports on the aircraft to be serviced. Disconnect the re-
turn adapter hose from the dual manifold and reconnect
When hydraulic power is turned on, the hy-
draulic hose will be under extremely high
to the aircraft.
pressure. Make sure that all quick disconnect
fittings are secure, and hoses are not kinked.
(12)
Replace caps and plugs in the dual man-
Injury from flailing hoses could result. Wear
ifold and return to the AGPU.
proper gloves and eye protection (goggles or
face shield) when operating hydraulic equip-
If the aircraft servicing operation requires
(13)
ment.
dual system operation, purge the 2 additional high pres-
sure adapters hoses using the following steps:
(1)
Verify that all hoses connections are se-
cure.
Change 9
2-32.3/(2-32.4 Blank)
