Trailer Construction; Chassis - PRONAR T663/1 Operator's Manual

SECTION 3 Pronar T663/1 T663/1 SILO

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. Lower frame design depends on configuration of a
given trailer version. 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 (9) 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 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.
In the rear section of the chassis there is lights support beam (3), to which mounted are all
electrical systems elements as well as hydraulic and pneumatic system sockets which are
used for connecting another trailer.
The trailer suspension consists of two axles (4) that are mounted to parabolic leaf springs
(16) 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 and equipped with shoe brakes activated by mechanical cam
expanders. Rear wheels are shielded with a pair of mudguards (11) secured to the trailer
frame brackets. Wheel chocks (12) are placed in the front part of the trailer, on the left
longitudinal member. Just behind the chock bracket there is the parking brake crank
mechanism bracket (13).
Hydraulic shear type support (10) is located between the drawbar's longitudinal members to
which the drawbar faceplate (6) is welded. The drawbar can be set in two positions
depending on tractor equipment. Drawbar eye (15) is bolted to the drawbar plate.
3.3