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![]() TM 55-4940-353-13&P
12. Install O-ring (26) on the drive piston (25).
6. Install gasket (33) on body (31).
13. Replace the drive-driven piston assembly
7. Assemble body (31) to bottom housing (34).
carefully.
Install nut (29) on body and tighten to retain the body
and bottom housing in position. DO NOT TIGHTEN
14. Install spring (21) on connecting rod (22).
DOWN NUT (29) AT THIS TIME. Install elbow (3).
Place air valve-housing on bottom housing (34). Line
15. Assemble the air-valve-housing securely to
up air valve, air outlet and inlet ports with the fluid outlet
the bottom housing (34) with bolts (4) and nuts (15).
and inlet check valves. Install tube assembly (1) on top
elbow (3). Rotate bottom housing (34) until lower elbow
16. Install O-ring (12) on bolt (11). Position the
(3) lines up with tube assembly (1). Remove tube
air valve in the air valve housing, as shown on
assembly (1) and air valve from bottom housing.
Illustrated Parts Breakdown (Figure 4-5) so that the top
of the air valve is just below the two long ports in the air
8. Insert cylinder (27) in bottom housing (34).
valve housing. Hold air valve in this position and install
a detonate pin (14), a spring (13), and a bolt (11), in
9. Install the drive-driven piston assembly in
each of the four detonate holes in the air valve housing.
the bottom housing, guiding the driven piston carefully
Tighten each bolt (11) until it bottoms.
into the body (31)
17. Operate the drive piston (25) and air valve
NOTE
to the UP position.
Do not install O-ring and backup rings in
the body (31) until the following adjustment
NOTE
has been completed.
In this operation and in the succeeding
10. Rotate the drive piston (25) slowly through
adjustment operations, the air valve may be
360 degrees, checking for binds between drive piston
operated up and down by applying air
and cylinder, or driven piston and body (31). Remove
binds by shifting the bottom housing on the body (31) as
pressure (not over 10 psi) alternately to the
required to free the pistons. When the drive piston can
tubing connection in the bottom housing
be rotated through a full 360 degrees, without binding at
(34), or the tubing connection in the air valve
any point, remove the drive-driven piston assembly,
housing.
tighten nut (29) securely and tighten setscrews (28).
18. With the air valve and drive piston in the UP
11. Install backup ring (35), O-ring (36), and
position, install spring (10) and nut (9) on connecting rod
second backup ring (35) in the seal groove in the body
(22). Thread nut (9) down until the bottom face is flush
(31). Use extreme care when installing the O-ring and
with the top surface of the air valve.
backup rings to avoid scratching the honed surface of
the bore.
4-3
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