TM 55-1520-240-23-6
7-267.1
DISASSEMBLE AND INSPECT 145HS775 RAMP CONTROL VALVE
(Continued)
7-267.1
Special care must be taken when
removing the piston and slide
assemblies to ensure that bearing
surfaces are not scratched, dented, or
marred in any way.
To avoid damaging bearing surfaces
of valve body (5), make sure to
support rod and Input pistons (46 and
45) when performing the following
procedures.
27.
Remove rod piston as follows:
a.
Carefully pull input piston (45) outward from
valve body (5) until it reaches its limit (refer to
position 1). This will move floating piston (47)
to the end of its travel on rod piston (46).
b.
While looking through port (48) in valve body
assembly (7), carefully pull rod piston (46)
back in opposite direction of input piston (45)
(refer to position 2), until pin assembly (49) is
observed through port (refer to view A).
c.
Obtain a flat tip screw driver small enough to
go through port (48) and into pin assembly
(49). Put a small piece of masking tape
(E388) on the tip of the screw driver to retain
pin assembly (49).
d.
Slide screw driver through port (48) and
press into pin assembly (49). Unscrew pin
assembly from rod piston (46) and slide
assembly (50), and remove pin from inside
valve body (5).
28.
Remove rod piston (46) and floating piston (47)
from valve body (5).
29.
Remove retainer (51) from floating piston (47).
30.
Remove floating piston (47) from rod piston (46).
31.
Remove packing (52) and piston (cap) seal (53)
from rod piston (46).
32.
Inspect bearing surface (54) on rod piston (46),
and seat (55) that receives packing and piston
seal (52 and 53). There shall be no nicks, dents,
or scratches.
33.
Remove input piston (45), slide assembly (50),
roller cage (56), and rollers (57) from valve body
(5) by carefully pulling on input piston. To prevent
damage to bearing surfaces of valve body and
avoid dislodging rollers and cage, take care to
support slide assembly as it leaves the valve
body.
NOTE
Pins (58 and 59) are pressed into
washers (60 and 61) to ensure proper
orientation inside valve body (5) at
installation. Pins need not be replaced
unless they are loose.
34.
Remove washers (60 and 61) with pins (58
and 59). Take care not to damage any bearing
surfaces inside valve body (5).
35.
Remove thrust plate (62) from inside valve body
(5).
36.
Remove roller cage (56) and rollers (57) from
slide assembly (50).
37.
Remove retainer (63) from floating piston (64),
and slide floating piston off input piston (45).
38.
Remove packing (65) and rod (cap) seal (66)
from input piston (45).
39.
Remove pin assembly (67) from input piston (45)
and slide assembly (50).
40.
Inspect bearing surface (68) of input piston (45)
and seat (69) that receives packing and cap
seals (65 and 66). There shall be no nicks, dents,
or scratches.
41.
Inspect slide assembly (50) as follows:
a.
Inspect bearing surfaces of slide assembly
(50). There shall be no nicks, dents, or
scratches.
b.
Check installation of threaded inserts (70 and
71) in slide assembly (50). Threads are to
be undamaged and below surface 1/4 to 1/2
turn below outer surface.
7-977
