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SECTION 3
Pronar 683
3.2 TRAILER CONSTRUCTION
3.2.1 CHASSIS
Trailer chassis consists of subassemblies indicated on figure (3.1). Lower frame (1) of the
load box is a structure welded from steel sections. The main support elements are two
longitudinal members connected with crossbars. In the middle section there is a socket (2)
used for mounting of the hydraulic tipping cylinder. In front of the sockets of the ram cylinder
is mounted the load box support (10). At the rear part of the lower frame, the rear beam (7) is
welded, which is terminated with ball pins. The trailer load box is mounted on them. The
support structure of the upper frame and the interlocking method allows tipping of the load
box to the side and to the rear. Sockets for mounting the upper frame are welded on the left
and right side of the front crossbars (8) of the lower frame.
At the rear of the chassis there are bolted lights support beams (3), which hold electrical
fittings. Rear hitch (9), designed to hitch another (twin-axle) machine is bolted to cross-bar of
the lower frame. A pin with diameter of ∅33 mm is adapted to connecting with drawbar eye of
∅40 mm. The crossbar also comprises hydraulic and pneumatic system sockets for
connecting a second trailer.
The trailer suspension consists of the axles (4) that are mounted to parabolic leaf spring
absorbers by means of U bolts. Absorber suspension is secured to lower frame (1). Axles are
made from square bars terminated with a pin, where wheel hubs (5) are mounted on cone
bearings. The wheels are single, equipped with brake shoes activated through mechanical
expander cams. Rear wheels are shielded with a pair of mudguards (12) secured to the
trailer frame. rear under-run protective device (15) is mounted on both sides of the trailer, in
its front section. Just behind the left under-run protective device, on the left longitudinal
member there are wheel chock (13) holders.
Drawbar eye (6) is mounted on the end of drawbar. In the lower part of the drawbar are
securing catches for hydraulically controlled shear type drawbar support (11). Further on
there is the ladder (14) on the left side to facilitate access to the load box.
3.3
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