TM 55-1730-229-34
AG 320A0-MME-000
TO 35C2-3-473-2
TM 1730-34/1
(11) Figure FO-11 shows the main
Figure FO-14
flow path when hydraulic fluid is
t h r o u g h a small opening.
supplied by the reservoir in the air-
s h o w s the flow while bleeding air from
craft being serviced.
Figures FO-12
t h e system. This same flow applies when
and FO-13 show how cold fluid is cir-
f i l l i n g or adding fluid to the system.
c u l a t e d through the system to warm it to
8-2.
HYDRAULIC MODULE.
Refer to
Warming is ac-
o p e r a t i n g temperature.
complished by opening the HIGH PRESSURE
B Y P A S S valve slightly--heat is generated
of hydraulic module.
MAINTENANCE
Section II.
8 - 3 . INTRODUCTION. T h i s s e c t i o n c o n -
d r i v e pad (4) with a thin coat of grease
t a i n s hydraulic system maintenance pro-
c e d u r e s . Certain maintenance procedures
require disassembly and reassemble of
(2) Carefully install pump (3) on
t h e hydraulic module to gain access to
Turn
studs on gearcase drive pad (4).
These
t h e component being repaired.
p u m p shaft slightly, if required, to en-
d i s a s s e m b l y and reassembly procedures
g a g e splines on gearcase drive pad.
are contained in Section III (Module
(3) Install washers (2) and nuts (1) and
Disassembly)
and Section IV (Module
tighten to between 180 and 200 inch-pounds of
Steps i n t h e s e s e c t i o n s
Assembly).
torque. Torque fitting jam nuts as shown in
a r e referenced for disassembly and re-
figure 8-5A.
assembly procedures necessary to remove/
(4) Perform steps (a) through (d)
i n s t a l l components.
8-4.
HYDRAULIC PUMP.
8-5.
HYDRAULIC PRESSURE GAUGE.
a . Remove.
(1) Open GAUGE SHUTOFF valve 1/4
This valve is on mai~n control
E n s u r e hydraulic system is not un-
turn.
d e r pressure before disconnecting
h y d r a u l i c hoses.
( 2 ) Observe pressure indication o n
It should
(1) Perform steps (a) through (d)
OUTPUT PRESSURE gauge (8).
If it does not, open HIGH
read zero.
PRESSURE BYPASS valve on manifold (15)
s l i g h t l y and observe that gauge pressure
( 2 ) Hold Pump (3) in position and
r e d u c e s to zero.
w a s h e r s (2).
(3) Close HIGH PRESSURE BYPASS and
GAUGE SHUTOFF valves on manifold (15).
( 3 ) Carefully remove pump (3) from
gearcase drive pad (4).
(4) Remove module from unit as de-
Install.
b.
( 5 ) Remove vent d r y e r as described
( 1 ) Lubricate splines on pump (3)
shaft and internal splines on gearcase
i n paragraph 4-92, TM 5 5 - 1 7 3 0 - 2 2 9 - 1 2 .
Change1 8-7