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Upper A-Frame Transverse Beam
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TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
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Hydraulic Controls
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.
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.
b.
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
a.
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
1-10

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