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 729 of 828
TM 9–2350–311–20–2
19–21
17
Open stop-check valve (10) slowly, allowing nitrogen to charge system. Raise pressure in 100 psi (690 kPa)
increments until gage (19) stabilizes at 550 psi (3792 kPa).
WARNING
Failure to close angle valve on main accumulator and pressure regulator valve could result in injury
from high pressure in hoses of nitrogen charging assembly and air pressure gage assembly.
18
Close angle valve (17) and shutoff valve (12). Let system remain idle for one hour after charging.
WARNING
Failure to open safety-relief valve could result in injury from high pressure trapped in hoses of nitro-
gen charging assembly and air pressure gage assembly.
19
Open safety-relief valve (16) to bleed pressure from nitrogen charging assembly (2) and air pressure gage
assembly (15).
20
Disconnect nitrogen charging assembly (2) and air pressure gage assembly (15) at angle valve (7).
21
Close pressure regulator valve (13) by turning counterclockwise.
22
Disconnect nitrogen charging assembly (2) from shutoff valve (12).
23
Close safety-relief valve (16).
24
Open angle valve (17).
25
Slowly open safety-relief valve (16), reducing pressure to 500 psi (3448 kPa) on accumulator (6), then close
safety-relief valve.
26
Close angle valve (17).
27
Open safety-relief valve (16).
28
Disconnect air pressure gage assembly (15) from valve body (5) on accumulator (6).
29
Replace air valve cap (4).
4
5
7
16
15
6
2
10
14
12
13
3
18
19
17
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