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 719 of 828

TM 9–2350–311–20–2

Change 2

19–11

24

Slowly open nitrogen valve (14). Read gage (24) to determine if leakage has occurred. If no leakage is de-

tected, slowly open safety-relief valve (23), releasing pressure in recuperator cylinder (3) to 700 psi (4827

kPa).

25

Close nitrogen valve (14).

26

Slowly open safety-relief valve (23).

27

Disconnect air pressure gage assembly (22) from nitrogen valve (14) on recuperator cylinder (3).

28

Apply soap suds to nitrogen valve (14) to check for nitrogen leaks. If leaks occur, tighten nitrogen valve. If

leaks are still present, release nitrogen pressure and replace defective nitrogen valve.

29

If no leaks are present, replace nitrogen valve cap (12).

30

Apply soap suds to both ends of recuperator cylinder (3) to determine if nitrogen leaks exist. Notify support

maintenance if leaks are present.

22

12

14

23

21

24

13

18

17

11

3

10

19

15