Lower A-Frame Transverse Beam

TM 5-5420-279-23

of the outer A-Frame legs. The beam is pinned in its upper position for deployment of the bridging

modules.

Fig 1.4 A-Frame

1-10-10 Lower A-Frame Transverse Beam

The lower A-Frame transverse beam spans the rear of the vehicle and attaches to the rear of the

slide frame at a hinged arrangement and to the outer A-Frame legs at their hinge points. It

provides mounting for the A-Frame folding hydraulic cylinders and for one end of the A-Frame

rotate hydraulic cylinders. A level installed on the beam accurately positions the horizontal axis of

the A-Frame (and thus the home bank platform) by adjustment of the vertical extension of either

of the A-Frame stabilizer legs.

1-10-11 Outer A-Frame Legs

A foldout A-Frame leg is attached at upper and lower hinge points to each end of the upper

and lower A-Frame transverse beams. Each leg has a circular baseplate and provides mounting

for a stabilizer hydraulic cylinder, an A-Frame raise hydraulic cylinder and one end of an A-Frame

folding cylinder.

The control valve for manual operation of the A-Frame raise/lower hydraulic cylinder is

mounted on the right leg. The stabilizer legs are also used to lift the slide frame clear of the

chassis to allow its deployment.

1-10-12 Hydraulic Cylinders

Two A-Frame rotate hydraulic cylinders are attached to a cross member on the outer

section of the slide frame and to the A-Frame. Retraction of the cylinders pivots the A-Frame from

its stowed position about its hinged attachment to the slide frame to its deployed vertical position.

Articulator cylinders hold the A-Frame in this position until the A-Frame is secured in position with

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