THEORY OF OPERATION - TM-10-5411-233-13-P0029

TM 10-5411-233-13&P

CARGO BED COVER (CBC), TYPE III, 2 1/2 T CARGO TRUCK, LMTV, AND LMTV TRAILER 0003 00

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 M35A2, 2 1/2 T Cargo Truck as well as the M1078, 2 1/2 T LMTV and M1082, 2 1/2 T LMTV

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 M35A2, 2 1/2 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 M1078, 2 1/2 T LMTV (4) or M1082, 2 1/2 T LMTV Trailer (5), a

vehicle-specific mounting plate (6) must be installed on the bed of the LMTV or LMTV Trailer. The

mounting plate is designed in such a way as to not require permanent modifications to the M1078, 2 1/2 T

LMTV or M1082, 2 1/2 T LMTV Trailer. Once the mounting plate is installed on the bed of the M1078, 2

1/2 T LMTV or M1082, 2 1/2 T LMTV Trailer, the CBC is mounted to the vehicle mounting plate via the

carrier mounting angles and door threshold.

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.

NOTE

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

CBC only.

To extend the upper section of the CBC, access the winch handle through the upper portion (10) of the

personnel door.

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

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