Assembly - TM-55-4940-353-13-P0015

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