TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 709 of 828

TM 9–2350–311–20–2

Change 2

19–2.1

NOTE

•

Two regulator assemblies are currently used for purging and charging fire control materiel. The

insert shows regulator 5580922, while the tank is shown with regulator 11729749.

•

With regulator 11729749, an adapter must be used to connect hose assembly to low pressure

port of regulator. Use a right or left-hand threaded 9/16 X 18 NF adapter, depending on thread

requirements of the hose assembly coupling.

4

Attach hose assembly (5) to low pressure port (6).

5

Shut off pressure regulator valve (7) by rotating counterclockwise.

NOTE

If pressure indicated is less than 100 psi (690 kPa), replace tank.

6

Open shutoff valve (2) slowly. Adjust until maximum tank pressure registers on high pressure gage (8).

NOTE

Gages labeled 0–15 psi, 0–30 psi, or 0–60 psi are authorized but must be in 1 psi increments.

7

Rotate pressure regulator valve (7) slowly clockwise until approximately 5 psi (34 kPa) registers on low pres-

sure gage (9).

7

8

6

6

5

7

2

8

9