CHAPTER 3 GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

C 1, TM 3-1040-214-34

CHAPTER 3

GENERAL SUPPORT MAINTENANCE INSTRUCTIONS

half (5) from the pressure tank coupling plug assembly

3-1. Serviceability Tests

(14). Remove and retain the pressure tank.

(7) Vent the air under pressure in the pressure

General support maintenance personnel are responsible

tank by turning the handle counterclockwise.

for recalling all dispersers from using units for

(8) Install the dust cap (13) on the plug assembly

hydrostatic-volumetric testing.

(14).

(9) If the plug assembly must be replaced, remove

a. Agent Tanks. Agent tanks will be subjected

the plug assembly (14) from the pressure tank valve

to a hydrostatic test at least once every 4 years. The date

(17).

the test is performed will be either stenciled on the agent

(10) If the check valve assembly (18) must be

tanks or stamped on aluminum tape.

Fasten the

replaced, remove the check valve assembly (18) from

aluminum tape around the diffusion pipe located

the pressure tank valve (17).

between the agent tanks. Test procedures will be

performed in accordance with TM 3-1040-251-15.

b. Assembly.

b. Pressure Tank. The air pressure tank will be

(1) If the check valve assembly (18) has been

subjected to a hydrostatic-volumetric test at least once

removed, apply antiseize compound or tape on the

every 4 years. The date the test is performed will be

threads. Install and tighten the check valve assembly on

either stenciled on the pressure tank or stamped on

the pressure tank valve (17).

aluminum tape. Fasten the aluminum tape around the

(2) If the plug assembly (14) has been re- moved,

neck of the pressure tank. Test procedures will be

apply antiseize compound or tape on the threads. Install

performed in accordance with TM 3-1040-251-15.

and tighten the plug assembly on the pressure tank valve

(17).

3-2.

Pressure Tank

Check

Valve

and

Plug

Assemblies

c. Servicing.

General support maintenance personnel are authorized

(1) Charge and test the pressure tank for leaks

to replace the pressure tank check valve assembly and

according to instructions in TM 3-1040- 221-12.

the plug assembly.

(2) Use approved compressors listed in TM 3-

1040-214-12.

a. Removal.

(3) Apply soapy water around the check valve

assembly and the plug assembly and check for possible

1) Close the pressure tank check valve by turning

leaks.

the handle (B, fig. 2-1) clockwise.

(4) If leaks occur, reinspect all connections.

(2) Open the shutoff valve by turning the handle

Tighten or replace the assembly. Perform step (1) above

(fig. 1-1) counterclockwise.

after tightening or replacing the assembly.

(3) Place the agent tanks in a horizontal position

with the pressure tank on top.

d. Installation.

(4) Loosen the wingnut, and disconnect the hinged

clamp that holds the pressure tank in place.

(1) Place the agent tanks in a horizontal position,

(5) Remove and retain the wingnut (11, fig. 2-5)

with the carrier pack on the bottom.

and eyelet (7).

(2) Check to see that the valve handle (step B, fig.

2-1) is closed (counterclockwise).

CAUTION

(3) Remove the cap (13, fig. 2-5), from the plug

assembly (14).

Exercise care when disconnecting

(4) Place the pressure tank on the agent tanks.

the quick-disconnect coupling half

from the pressure tank coupling plug

to prevent possible damage to the

tube.

(6) Disconnect the quick-disconnect coupling

3-1