Preformed Packing and Setscrews

TM 3-1040-214-12

a. Removal.

b. Assembly.

(1) Purge the air in the air pressure system

(1) Screw the handle (2-1) into the body of

(para 4-10a)

the shutoff valve (22) and tighten setscrew (23).

(2) Remove the safety head (12) and washer.

(2) Screw the shutoff valve (22) into the

adapter (9). Tighten the shutoff valve (22) in the adapter

b. Installation

(9) as shown in figure 4-5.

(1) Check to see that a washer is located on

(3) Attach the vent tube (21) to the shutoff

the threaded portion of the safety head (12).

valve (22) and tighten the nut.

(2) Connect the safety head

(12) to the

(4) Connect each hose assembly (2) to the

safety valve (11) and tighten.

safety valve adapter (9) and tighten.

4-34. Preformed Packing and Setscrews

(5) Connect the diffusion tube nut (8) to the

safety valve adapter (9).

Organizational maintenance personnel are authorized to

replace the safety valve adapter preformed packing and

(6) Cross the open ends of both hose

screw.

assemblies (2) and connect the quick-disconnect coupling

halves (3) to opposite pipe and cap assemblies (4).

a. Removal

(7) Lace the carrier pack (8, Fig. 4-10) to the

(1) Purge the air in the pressure system (para

frame (10).

4-10a).

4-36. Adjusting Pressure Regulator

(2) Remove the pressure tank and valve

assembly (para 4-10b).

a. General. Organizational maintenance personnel

are authorized to adjust the pressure regulator.

(3) Remove the screw (7, Fig.

4-5) and

Adjustment is performed upon receipt of an M3

preformed packing from the safety valve adapter (9).

disperser, monthly, and when a pressure regulator has

b. Installation

been replaced.

(1) Install preformed packing (6) and screw

b. Preparation for Adjusting.

(7).

(1) Unlace the canvas pack carrier on one

(2) Install the

pressure

tank

and

valve

side to expose the pressure regulator.

assembly (para 4-10c).

(2) Close the pressure tank valve by turning

4-35. Shutoff Valve, Handle, and Vent Tube

the valve handle clockwise (Fig. 4-9).

Organizational maintenance personnel are authorized to

(3) Open the shutoff valve by turning the

replace the shutoff valve, handle, and vent tube.

shutoff valve handle (24, Fig. 4-5) counterclockwise.

a. Removal.

(4) Close the shutoff valve by turning the

handle (24) clockwise.

(1) Purge the air in the pressure system

(para 4-10a).

(5) Check pressure in pressure tank (para 4-9).

The pressure for testing purposes should be a minimum

(2) Unlace one side of the carrier pack.

of 2,000 psi.

(3) Disconnect the quick-disconnect couplin g

half (3, Fig. 4-5) on each hose assembly (2) from the

NOTE

pipe and cap assembly (4).

Use

talc

when

checking

(4) Disconnect the diffusion tube nut (8) from

adjustment of a replaced pressure

the safety valve adapter (9) and remove the pressure

regulator and also when performing

regulator and attaching parts.

required monthly adjustment of

pressure regulator.

(5) Remove hose assemblies (2) from the

adapter (9).

(6) Remove vent tube (21).

(6) Fill the agent tanks with T1 talc.

(7) Loosen set screw (23) and unscrew

(7) Obtain a pressure gage from the M27 riot

handle (24) from the shutoff valve (22).

control service kit (TM 3-1040-221-12).

4-24