PRONAR T683P, User Manual

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CHAPTER 3 Pronar 683P
3.3
3.2 CONSTRUCTION OF A TRAILER
3.2.1 CHASSIS
The trailer chassis consists of the units specified in figure (3.1). The lower frame (1) is a
welded structure made of steel sections. The basic load-bearing element are two longitudinal
members connected with crossbars. In the central part there are sockets (2) for mounting the
hydraulic tipping cylinder. The load box support (10) is mounted in front of the tipping cylinder
sockets. In the rear part of the lower frame, the rear beam (7) is welded, terminated with ball
pins, on which the load box is mounted. The design of the foundation of the upper frame and
the locking method enables tipping of the load box sideways and backwards. The front beam
(8) of the lower frame, on the right and left side have the welded brackets for mounting the
upper frame.
Lighting beams (3) are bolted to the rear part of the chassis, to which elements of electrical
equipment are attached. The rear hitch (9) is turned to the crossbar of the lower frame,
intended for aggregating the second machine (two-axle). The
∅
33 mm diameter pin is
adapted to be connected with a
∅
40 mm tie rod. There are also hydraulic and pneumatic
system sockets for connecting a second trailer in the crossbar.
The trailer's suspension is made of road axles (4), attached to parabolic springs with U bolts.
The suspension is attached to the lower frame (1). The axles are made of a square bar
terminated with a pin, on which the wheel hubs (5) are mounted on the tapered roller
bearings. These are single wheels equipped with calliper brakes actuated by mechanical cam
expanders. The rear wheels are covered with a pair of fenders (12) attached to the trailer's
frame. On both sides of the trailer, in its front part there are underrun protection (15). The
pockets of the support wedges (13) are located on the left stringer just behind the left shield.
The drawbar eye (6) is mounted on the front part of the drawbar. In the lower part of the
drawbar there are holders for the hydraulic scissor support (11). Further on, on the left side, a
ladder (14) is installed to facilitate access to the load box.