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SECTION 2
Pronar T680
3.2 TRAILER CONSTRUCTION
3.2.1 CHASSIS
The trailer chassis consists of the subassemblies indicated in figure (3.1). Lower frame (1) is
a structure welded from steel sections. The main support elements are two longitudinal
members connected with crossbars. In the middle section of the frame there are sockets (6)
used for mounting the hydraulic tipping cylinder. Load box support (5) is mounted in front of
the sockets of the tipping cylinder. At the rear part of the frame there is a beam (11)
terminated with ball pins. The support structure of the upper frame and the interlocking
method allows tipping of the load box to the side and to the rear. Brackets for mounting of the
upper frame are welded on the left and right side of the front beam (10) of lower frame.
Shapes of the holes are designed in such a way that pins connecting the upper frame with
the lower frame are replaced in the correct sockets.
At the rear of the chassis there is a lights support beam (8), which primarily holds electrical
fittings. The optional rear hitch and the sockets of the hydraulic system and pneumatic
system for connecting the second trailer (double-axle trailer) are attached to the rear profile
of the lower frame, above the beam.
The trailer suspension consists of the axles (4) and leaf springs (7), secured to the turntable
frame (2) at the front and the lower frame (1) at the rear using pins. Axles are secured to
suspension springs using absorber plates and U bolts. Axles are made from square bars
terminated with a pin, where wheel hubs are mounted on cone bearings. The wheels are
single and equipped with shoe brakes activated by mechanical cam expanders.
Drawbar (3) with ∅40 mm eye is mounted on the turntable frame (2). The drawbar height is
adjusted using a bolt tensioner connected to the drawbar spring (12). In optional equipment a
drawbar with eye diameter of ∅50 mm is also available, designed for connection to upper
transport hitch with pin diameter of ∅46 mm.
3.3
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