LOCATION AND DESCRIPTION OF MAJOR COMPONENTS AND SYSTEMS (CONTINUED)
TOP REAR DOOR
The top rear door is hydraulically actuated. In the raised position,
it forms an overhead ballistic shield, providing protection between
the M992 and the supported howitzer. The door is also used to
deploy and position the conveyor. From the closed position, it can
be raised to any position through 120 degrees. The top rear door
directional control valve can be actuated by two thee-position
switches mounted inside the rear door opening on the left side. One
is mounted high, the other low, for inside and outside access.
In the event of hydraulic power loss, the door is prevented from
closing by a pilot check valve which stops hydraulic fluid backflow
within the door hydraulic system. In addition, a mechanical lock
engages the vehicle hull in the 45- and 90-degree positions.
TA309939
1-23
TM 9-2350-267-20
