Trailer Construction; Chassis - PRONAR PT610 Operator's Manual

SECTION 3 Pronar PT610

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 load-bearing elements are two longitudinal
members connected with each other by means of crossbars. Parking brake mechanism (10)
is welded to the right longitudinal member. In the middle section there are sockets (2) used
for mounting of the tipping ram cylinder. Load box support (14) is mounted in front of the
sockets of the tipping cylinder. At the rear part of the lower frame there is rear beam (3)
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 (9) of lower frame.
Shapes of the bracket 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 bolted lights support beams (8), which primarily holds
electrical fittings. Rear hitch (16) can be fitted above the lights support beam as optional
equipment. The hitch is designed for coupling a second, two-axle trailer. A pin with diameter
of ∅33 mm is suitable for connecting with drawbar eye of ∅40 mm.
The trailer suspension consists of the axles (4) and leaf springs (11), secured to the turntable
frame (5) at the front and the lower frame (1) at the rear using the leaf spring pins (12). 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 (6) with ∅40 mm eye is mounted on the turntable frame (5). The drawbar height
may be adjusted by adjustment of sliding spring catch (7), connected to drawbar pin (13). 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