MIL-T-11663 Truck, Materials Handling, Container Hoisting, Rear Hoist, 21,000 To 32,000 Pounds Gvw, 4X2This specification covers diesel or gasoline engine driven, four-wheel, two-rear-wheel drive materials handling trucks having gross vehicle weights GVW of 21,000 to 32,000 pounds, for normal operating conditions. Vehicles procured under this specification are commercial items which shall be warranted by the manufacturer as specified in acquisition documents.

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MIL-T-11663K

designed for positive retention of the container bail when engaged in the dumping hook, and shall be provided to prevent the possible disengagement of the container from the carriage during dumping operations. The dumping hook shall automatically engage the container bail. A spring shall be provided and designed to exert 60 pounds of force on the dumping hook to assure a receptive position for the container bail engagement. Engagement and disengagement of the dumping hook retention devices shall be controlled by the operator from the cab. An indicator light shall be furnished in the cab and marked to indicate to the driver that the dumping hook container bail retaining devices are engaged in the locked position. An instruction decal shall be provided in the cab to explain the complete sequence of the operation. The dumping hooks on type I units shall be automatically retracted and retained by the forward horizontal movement of the carriage assembly to prevent inadvertent latching of the container bail so as to allow proper placement of the container in the travel position. The dumping hooks shall be exposed for the container bail engagement only when the carriage assembly is in the rearmost position.

3.5.1 Type I. Type I unit shall be the chain hook-up and two-arm lift type, for lifting, placing on the truck, transporting to a dump area, and dumping the contents of the container. The

hoist-haul unit shall be designed and mounted on the truck chassis to operate and perform satisfactorily without truck counterweights.

3.5.1.1 Performance. The unit shall be capable of picking up any container from ground level and from 45 inches above ground. After attachment, each of the following fully loaded container pickup operations shall be accomplished in not more than 1 minute:

(a) From ground to travel position

(b) From 45 inches above ground to travel position

3.5.1.2 Dumping. Any fully loaded container shall be completely emptied when contents are dumped in a pit or trench located not less than 4 feet rearward of the rear axle.

3.5.1.3 Travel position. A continuous support for the bottom of all containers shall be provided on the truck to carry the containers while the vehicle is in transit. When the container is in the carrying position, no part of the weight of the container, with payload, shall be supported by the lifting arm, lifting chains and hydraulic mechanism. Provision shall be made for positively retaining containers in the carrying position to prevent movement while in transit.