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 715 of 828

TM 9–2350–311–20–2

19–7

CAUTION

Charging the system too fast will heat the dry nitrogen. This will give an inaccurate reading because

the pressure will decrease when the nitrogen cools, possibly causing equipment to malfunction.

NOTE

Estimated time to charge system is 30 minutes. System should be charged at ambient temperature

of weapon use.

11

Tighten nut on nitrogen valve (14) when sound of nitrogen flow has stopped.

12

Close nitrogen cylinder (11) shutoff valve (17).

13

Open angle valve (16) on nitrogen charging assembly (10). Slowly relieve pressure in nitrogen charging as-

sembly. Remove angle valve (13) from nitrogen valve (14).

14

Install nitrogen valve cap (12) on nitrogen valve (14).

15

Close pressure regulator valve (18).

16

Remove nitrogen charging assembly (10) from nitrogen cylinder (11).

10

11

15

16

18

20

19

14

12

21

17

13