TM 9-2350-287-20-11-16. EQUIPMENT OPERATION (continued).UPPER REAR DOORThe upper rear door is hydraulically actuated by the ballistic shield directional control valve on the hydraulic controlpanel. When raised, the upper rear door provides ballistic protection between the M992A1 and a supported howitzer.The door also helps deploy and position the conveyor assembly. From the closed position, it can be raised to anyposition by a hydraulic actuator up to 120 degrees. The upper rear door directional control valve can be actuated bytwo three-position switches mounted inside the rear door opening on the left side. For inside and outside access, oneis mounted high and the other is mounted low.In the event of hydraulic system failure, the door is prevented from closing by a pilot check valve that stops hydraulicfluid backflow within the door hydraulic system, In addition, a mechanical lock engages the vehicle hull in the 45- and90-degree (from closed) positions.In the upper rear door, there are two small doors that allow the conveyor to be operated while the upper rear door isclosed. This feature is for use with the M109A6 howitzer.1-27
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