TSE DP20-4H, Owner'S Manual

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Suspensions
surrounded by four natural rubber cords encased in the main
structural member of the axle beam.
The wheel/hub spindle is attached to a lever, called the torsion
arm, which is fastened to the rubber encased bar. As load is
applied, the bar rotates causing a rolling/compressive resistance
in the rubber cords. This action provides the same functions as
conventional sprung axles with several operating advantages
including independent suspension.
Except for periodic inspection of the fasteners used to attach the
Torflex® axle to the vehicle frame, no other suspension
maintenance is required on Torflex® axles. They are, of course,
subject to the maintenance and inspection procedures regarding
brakes, hubs, bearings, seals, wheels, and tires as outlined in this
manual.
CAUTION
DO NOT WELD ON THE TORFLEX® BEAM. It has rubber
cords inside and the heat generated by welding could
damage the cords.
Airflex™ Suspension
The Dexter Airflex™ suspension is a unique combination of
Torflex® axle and conventional air suspension technology. This
low maintenance suspension system carries the load on a
cushion of air, usually supplied by an on-board compressor and
storage tank. A load leveling valve maintains a constant ride
height, regardless of load. As load is added to the trailer, the
valve will automatically signal the compressor to supply more air.
As loads are removed, the same valve will exhaust air to maintain
the same height and ride characteristics.
The Airflex™ suspension can be supplied with a dump valve
which allows the trailer to be lowered several inches to facilitate
loading or leveling. Once loaded, the valve is reversed and the
system is pressurized to raise the trailer back up to normal
running height.