CARGO BED COVER (CBC), TYPE IV, 5 T CARGO TRUCK, MTV, AND MTV TRAILER
THEORY OF OPERATION
THEORY OF OPERATION
General. The Cargo Bed Cover (CBC) is a lightweight rigid cover which can be mounted to the cargo bed
area of the M923, 5 T Cargo Truck as well as the M1083, 5 T MTV and M1095, 5 T MTV Trailer and
provides environmental protection and physical security for equipment carried by the vehicle.
Operational Concept. The Cargo Bed Cover (1) mounts to the bed of the M923, 5 T Cargo Truck (2) by
means of threaded inserts that are installed in the truck bed (3). Carrier mounting angles and door
threshold installed around the base of the lower stationary section of the CBC are used to bolt the CBC to
the bed of the cargo truck.
When the CBC is to be installed on the M1083, 5 T MTV (4) or M1095, 5 T MTV Trailer (5), a vehicle-
specific mounting plate (6) must be installed on the bed of the MTV or MTV Trailer. The mounting plate is
designed in such a way as to not require permanent modifications to the M1083, 5 T MTV or M1095, 5 T
MTV Trailer. Once the mounting plate is installed on the bed of the M1083, 5 T MTV or M1095, 5 T MTV
Trailer, the CBC is mounted to the vehicle mounting plate via the carrier mounting angles and door
The Cargo Bed Cover consists of an upper extendable section (7) and a lower stationary section (8). It is
the lower section that is mounted to the truck bed or vehicle mounting plate. The upper section can be
lowered for air transport or extended for operational use.
The CBC is extended by means of a winch and cable system (9) installed inside the Cargo Bed Cover. It
is locked in the extended position and supported by four lifting/locking assemblies (15) and cable tension.
The Cargo Bed Cover should not be entered prior to raising the upper
section. Access to the winch handle should be from the outside of the
To extend the upper section of the CBC, access the winch handle through the upper portion (10) of the
Once a person has accessed the winch handle through the upper portion (10) of the personnel door, the
upper section (7) of the CBC is extended using the ratcheting handle (12) attached to the winch and cable
assembly (9). As the handle is turned, the upper section extends upward. The upper section is raised until
the mark (13) stenciled on the inside wall of the upper section is visible.
When the upper section has been raised to the stenciled warning mark (13), a second person removes
the hairpin cotter (14) that secures the lifting/locking assemblies (15) in each corner of the CBC to the roof
of the upper section. A hairpin cotter (16) that secures the handle (17) to the main body of the
lifting/locking assembly (15) is also removed. The handle (17) is positioned so that it is 90 from the main
body of the lifting/locking assembly.
Each lifting/locking assembly (15) is then swung down from its stowed position on the roof and rotated
180 counterclockwise into position over the lower section corner fitting pulley assembly (18) located in