TM 55-1520-240-23-6
7-268.1
ASSEMBLE 145HS775 RAMP CONTROL VALVE (AVIM)
(Continued)
7-268.1
4.
Lubricate and install packing (7) on relief valve
assembly (8) under head of relief valve.
5.
Lubricate and install packing (9) in seat (10) of
relief valve assembly (8).
6.
Install piston (cap) seal (11) over packing (9) as
follows:
a.
Lubricate piston (cap) seal (11) and
installation tool (T173) with hydraulic fluid
(E199).
b.
Slide piston (cap) seal (11) over tool (T173)
until it reaches edge of tool.
c.
Move tool (T173) over shaft of relief valve
assembly (8). Hold piston (cap) seal (11) and
pull back on tool. Make sure piston (cap) seal
fits properly over packing (9).
d.
Lubricate sizing tool (T174) with hydraulic
fluid (E199), and slide sizing tool back and
forth over shaft of relief valve assembly
(8) and piston (cap) seal (11). Repeat as
required to make sure seal is properly seated
on packing (9).
7.
Lubricate and install relief valve assembly (8).
Torque valve 133 to 147 inch-pounds.
8.
Lockwire relief valve assembly (8) to valve body
(4). Use lockwire (E229).
9.
Lubricate seal flanges (12 and 13) of input and
rod pistons (14 and 15), packings (16 and 17),
and piston seals (18 and 19) with hydraulic fluid
(E199).
Special care must be taken when
installing packings and piston (cap)
seals on input and rod pistons. If
seals are damaged, valve will bypass
internally and fail to work properly.
10.
Install packings (16 and 17) in seats of seal
flanges (12 and 13) on input and rod pistons
(14 and 15).
11.
Lubricate and install piston (cap) seals (18 and
19) over packings (16 and 17). Use installation
and sizing tools (T175 and T176) to install piston
seals in same manner as described in step 6.
7-987
