TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download
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TM 9–2350–311–20–2 19–28 Change 2 19–6 ACCUMULATOR ASSEMBLY, SECONDARY This task covers: a. Service (Method One) b. Service (Method Two) INITIAL SETUP Tools Artillery and turret mechanic’s tool kit (SC 5180–95–CL–A12) Nitrogen charging kit (item 3, Appx H) Materials/Parts Dry nitrogen (item 22, Appx D) Equipment Condition Discharge hydraulic pressure (para 6–3.1) a. Service (Method One) NOTE Secondary accumulator assembly may be charged while mounted in cab. 1 Remove two cap screws (1) and retaining strap (2). 2 Remove air valve cap (3) and loosen check valve nut (4) on valve (5) to release nitrogen precharge pres- sure from secondary accumulator assembly (6). 3 Obtain nitrogen charging assembly (7) and remove gage (8). WARNING Secondary accumulator assembly contains high pressure nitrogen. Use caution when handling and working with it. 4 Connect nitrogen charging assembly (7) to secondary accumulator assembly (6) and nitrogen charging cyl- inder (9). 5 Attach angle valve (10) of nitrogen charging assembly (7) to valve (5), but do not tighten angle valve (10). Close stop-check valve (11) and angle valve (12). 6 Open shutoff valve (13) on nitrogen cylinder (9). 7 Slowly open pressure regulator valve (14) until 3000 psi gage (15) shows 15–20 psi (103–138 kPa). Close pressure regulator valve. 8 Open stop-check valve (11) on nitrogen charging assembly (7). Tighten angle valve (10) just before 3000 psi gage (15) register 0 psi (0 kPa). 9 Loosen check valve nut (4) approximately one turn (2–1/4 turns is fully open). 10 Open pressure regulator valve (14) until 3000 psi gage (15) registers 1500 ± 50 psi (10342 ± 345 kPa). 11 Tighten check valve nut (4) when sound of nitrogen flow has stopped. 12 Close pressure regulator valve (14).