ARMY TM 5-5420-212-10-1MARINE CORPS TM 08676A-10/1-1(7)Longitudinal GirderTwo longitudinal girders are used to position the rear roller beam 15 ft from the front roller beam and ensure thatboth roller beams are parallel to each other. The girder also assists in the assembly/disassembly of the end of bridge.The dowels at the end of the girder are inserted in the holes in both roller beams. When the roller beams arefinally positioned the longitudinal girders remain located in the front roller beam but are removed from the rear roller beamand lowered to the ground ready to assist in assembly/disassembly of the end of bridge.(1)DOWELS. Used to locate the longitudinal girder in the roller beams.(8)Hydraulic Jack 1 ST & 20TThe hydraulic jack 15T is used in the construction of all single story, and double story MGB’s with and without linkreinforcement, in the adjustable supports to level the roller beam. It is also used in the landing roller pedestal Mk 1 forsingle story MGB and double story MGB without link reinforcement, and in the landing roller pedestal Mk1 to raise andlower the far end of the bridge.The hydraulic jack 20T is used in the landing roller pedestal Mk 2 on double story MGB’s with link reinforcement.The jack is identified by its data plate, and silver grey paint.1-32
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