TM 55-1730-229-12
TO 35C2-3-473-1
lever to off and make sure reservoir
NOTE
lever is set to AGPU.
Dual service manifold is
(12) Set hydraulic power switch
used on both single and dual
to on and set pressure relief valve
dual hydraulic systems.
and aircraft system pressure in
accordance with Table 2-7.
(2) Flush hoses and connect AGPU
to aircraft GSE connectors in accor-
(13) Set the AGPU hydraulic
dance with paragraphs 2-7a through
output switch to on.
c, above.
(3) Locate a clean 10-gallon or
NOTE
larger drum.
AGPU fluid level will de-
(4) Connect a hose to drain
crease to between 1/2 and
connector on the AGPU dual service
1/3 full on the reservoir
manifold drain port and place opposite
level gauge. Do not allow
end of hose in drum. (Any AGPU adap-
the reservoir level to de-
ter hose can be used as the drain
crease below 1/3 full. (5-
hose by removing the quick disconnect
7 gallons flushed)
couplings at both ends.)
CAUTION
(5) Ensure bypass/flush and fill/
drain valves are closed.
Do not let the reservoir
go empty. Extensive da-
NOTE
mage to the AGPU hydraulic
will occur.
Personnel are required to
use the aircraft intercom
(14)
While
monitoring
AGPU
communication system to
fluid level cycle flight controls
maintain
voice
commu-
(cyclic, collective, and pedals) 5
nications
between
the
cycles each.
person
operating
the
flight controls and the
(15)
Shut off AGPU dual mani-
AGPU operator.
fold drain port.
(6) Apply external power to the
(16) Cycle flight controls two
aircraft and establish voice communi-
additional cycles.
communication via intercom communi-
cation system.
(17)
Flush is complete.
(7) Apply external air to aircraft
(18)
Switch
AGPU
hydraulic
(AH-64 only).
output to off.
Decrease hydraulic
pressure to 500 psi. Switch hydraulic
(8) Recheck the AGPU reservoir
power to off.
fill level gauge on the hydraulic
control panel to ensure the reservoir
(19)
While monitoring utility
is full. Add fluid if necessary.
manifold reservoir level, move the
return bypass to bypass until the
(9) Open AGPU dual hydraulic
proper reservoir level is reached then
service manifold drain valve and drain
switch back to the off position.
aircraft reservoir.
(20) Shut down AGPU. Discon-
(10) Discharge aircraft hydraulic
nect and store hoses and mani-
accumulators.
fold.
(11) On the AGPU hydraulic con-
trol panel set return/bypass
Change 8
3-25/(3-26 Blank)
