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SECTION 3
Pronar 683
3.2 TRAILER CONSTRUCTION
3.2.1 CHASSIS
Trailer chassis consists of 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 there is a socket (2) used for
mounting of the hydraulic tipping cylinder. Load box support (10) is mounted in front of the
sockets of the tipping cylinder. 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 suitable for 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 springs by
means of U bolts. Leaf spring suspension is secured to lower frame (1). Axles are made from
square bars terminated with pins on which wheel hubs (5) are mounted on cone bearings.
The wheels are single and equipped with shoe brakes activated by mechanical cam
expanders. Rear wheels are shielded with a pair of mudguards (12) secured to the trailer
frame. Under-run protection devices (15) are optionally mounted on both sides of the trailer,
in its front section. Just behind the left under-run protection 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 there are
securing catches for hydraulically controlled shear type drawbar support (11). Further on, on
the left side, there is ladder (14) to facilitate access to the load box.
A toolbox can be installed as additional equipment.
3.3
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