TM 5-3805-255-14
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FRAME
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Chassis
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The chassis components are divided into four groups to simplify maintenance and to provide a better
understanding of each group. The groups (Figure 21) are as follows: main frame, sheet cowling, operator's
compartment, and boom and bucket.
Figure 21. Chassis Components.
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Main Frame
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The forward portion of the articulated frame provides a mount for the operator's compartment. Seated on the
forward portion, the operator is always in line with the bucket allowing a greater degree of control and operating
accuracy. The rear section of the main frame provides a platform to mount the engine, converter, transmission,
grille, and bulkhead.
In addition to their center hinge pins the frame sections are linked together by a pair of steering cylinders. The
bases of the cylinders are anchored in the forward frame section with the rod ends pinned to the rear section. As
one cylinder extends, the opposite contracts, pivoting the frame sections on the hinge pins and steering the loader.
This type of articulated steering has definite advantages; it eliminates the need for a steering axle with its additional
parts, eliminates the drag link and tie rod and allows the rear wheels to track in the path of the front wheels. This
latter item ensures a much shorter turning radius than that afforded by the more conventional rigid frame and
steering axle type.
The front axle is fastened directly to the forward frame section. The rear axle is connected to a bolster which in turn
is fastened by two pins to the rear frame section. This allows the rear axle to oscillate on uneven terrain.
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