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TM-9-2350-311-20-2 Maintenance Manual Volume 2 for M109 Cab Download

Page 186 of 828

TM 9–2350–311–20–2 3–75 e. CAB HYDRAULIC SYSTEM — CONTINUED (5) POWER PACK OPERATES CONTINUOUSLY WHEN CAB POWER AND MASTER SWITCHES ARE ON. INITIAL SETUP Tools Artillery and turret mechanic’s tool kit (SC 5180–95–CL–A12) Replace power relay box assembly electromagnetic relay (para 8–13). 1. Turn MASTER and CAB POWER switches to OFF. 2. Disconnect cannon plug at pressure switch. 3. Turn MASTER and CAB POWER switches to ON. 4. Observe power pack operation. 5. Turn MASTER and CAB POWER switches to OFF. Did power pack operate continuously? Charge main accumulator assembly nitrogen pressure (para 19–4). If malfunction persists, go to step B. Perform zero-pressure check (para 6–10) on main accumulator assembly. Is pressure 500 to 550 psi (3448 to 3792 kPa)? A yes no yes no PRESSURE SWITCH PRESSURE GAGE Replace pressure switch (para 6–6). END OF TASK B