TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 19–16 Change 2 19–3 ACCUMULATOR ASSEMBLY, MANUAL PUMP — CONTINUED b. Service (Method Two) — Continued 14 Open stop-check valve (9), allowing nitrogen to enter the accumulator (17) until gage (21) on the air pres- sure gage assembly (18) reads 50 psi (345 kPa). 15 Close stop-check valve (9). 16 Open safety-relief valve (19) until all nitrogen is bled from accumulator (17), then close safety-relief valve. 17 Repeat steps 14 through 16 to remove all traces of moisture prior to charging system to full pressure. Re- open stop-check valve (9). CAUTION Changing 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 or more. System should be charged at ambient tem- perature of weapon use. 18 Open pressure regulator valve (14) slowly, turning clockwise until pressure on 3000 psi gage (15) registers 110 psi (758 kPa) at 70°F (21°C). 19 Open stop-check valve (9) slowly, allowing nitrogen to charge system. WARNING • Failure to close check 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 assem- bly. • Failure to open safety-relief valve could result in injury from high pressure trapped in hoses of nitrogen charging assembly and air pressure gage assembly. 20 Close angle valve (20) and nitrogen cylinder (2) shutoff valve (12). Let system remain idle for one hour after charging. 21 Open safety-relief valve (19) to bleed pressure from nitrogen charging assembly (11) and air pressure gage assembly (18). 22 Disconnect nitrogen charging assembly (11) and air pressure gage assembly (18) at angle valve (5). 23 Close pressure regulator valve (14) by turning counterclockwise. 24 Disconnect nitrogen charging assembly (11) from nitrogen cylinder (2) shutoff valve (12). 25 Close safety-relief valve (19).