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 721 of 828
TM 9–2350–311–20–2
Change 2
19–13
4
Remove accumulator cap (3) and air valve cap (4).
5
Attach angle valve (5) to valve body (6), but do not tighten. Back out stem (7) of angle valve until stem no
longer contacts valve core (8).
6
Close stop-check valve (9) and angle valve (10) of nitrogen charging assembly (11).
7
Open nitrogen cylinder (2) shutoff valve (12) and observe nitrogen cylinder 4000 psi gage (13). Pressure
must be greater than 90 psi (620 kPa).
8
Open pressure regulator angle valve (14) until 3000 psi gage (15) reaches 15–20 psi (103–138 kPa), then
close pressure regulator valve.
9
Open stop-check valve (9) and tighten angle valve (5) just before 3000 psi gage (15) reaches zero.
10
Open pressure regulator valve (14) until gage (16) reaches 75–90 psi (517–620 kPa).
11
Turn in stem (7) of angle valve (5) (clockwise) until nitrogen begins to enter accumulator (17). Allow accu-
mulator to fill slowly.
12
Close pressure regulator valve (14) when sound of nitrogen flowing into accumulator (17) has stopped.
13
Back out stem (7) of valve (5) all the way (counterclockwise).
14
Open angle valve (10) slowly to release pressure in the nitrogen charging assembly (11).
15
Remove angle valve (5) from accumulator (17).
16
Apply soap suds to fittings of accumulator (17) to determine if nitrogen leaks exist. Notify support mainte-
nance if leaks are present.
6
4
3
8
11
16
10
13
12
7
9
17
14
15
5
2
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