TM 9-2330-271-14&P
Figure 4-37. Tandem suspension system, XM574,
XM574E1, XM654, XM680, XM680E1, XM738, XM739,
XM739E1, XM822, XM823, XM824
b.
Removal.
(2) These semitrailers have a single point, two-
spring, tandem axle suspension which utilizes
(1) Support front of vehicle by extending
parallelogram type linkage.
landing gear support legs. Using the leveling jacks, raise
(3) Two helper springs are mounted directly
rear of vehicle enough to relieve tires of ground contact.
over two main springs to provide added support under
Support vehicle with support stands.
heavy loads.
(2) Remove wheel and tire assemblies
(4) The helper spring assembly consists of
eight spring leaves. The main spring assembly consists
support.
of 12 spring leaves.
(3) Place jack under axle and bracket
(5) Each end of the main spring assembly rests
assembly (fig. 4-38) and raise chassis just far enough to
on wear pads mounted on spring guide brackets
take weight of springs off front and rear axle spring
attached to the axles.
brackets.
(6) The tandem suspension is the connecting
member between the axles and the frame. It acts to
absorb the shock loads imposed by the road.
4-55
