TM-9-2350-311-34-2 Maintenance Manual for Volume 2 M109 Cab Download
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TM 9-2350-311-34-2 b. Traversing System. The cab traversing system consists of a traversing mechanism (11) and bypass valve assembly (12). The traversing mechanism is driven by a fixed-displacement hydraulic motor (13) through either an electrically operated clutch (14) (M109A2/M109A3 howitzers) or a hydraulic clutch (15) (M109A4/M109A5 howitzers). Hydraulic pressure is transmitted through a solenoid-operated clutch valve (16) to the hydraulic clutch in M109A4/M109A5 how- itzers. In the event of solenoid or electrical control circuit failure, the clutch valve can be operated manually to activate hydraulic pressure. The bypass valve assembly, when activated by the gunner, allows only manual operation of tra- versing mechanism. A manual traverse handwheel (17) is used to operate the traversing mechanism manually. 1-17