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SECTION 3
Pronar T386
The trailer is equipped with rear fender which is withdrawn and extended by means of two
cylinders (7). Depending on the length of the transported load box, proper length of the
fender should be set. Oil pumped under pressure is supplied to the manifold (1). Oil from the
manifold is delivered to flow divider (11), which divides the oil stream proportionally to
cylinders (7).
The hydraulic interlock of the suspension is used for supporting the rear axis of the trailer
while pulling the load box on and removing the load box from the trailer and in tipper
operation mode. Cylinders of the suspension interlock (6) are always extended when rising
cylinders (3) are supplied and folded when the tipping frame is in the resting position.
When extending the raising cylinders (3), the limit valve (9) is activated to prevent unlocking
the rear axle support suspension. The suspension will be unlocked when the raising cylinders
are completely withdrawn (the rest position of the tipping frame). Anti-shock valve (8) protects
the system against sudden pressure jumps and ensures smoother operation of cylinders.
Hydraulic cylinder (5) controls the interlock which ensures attachment of the load box to the
trailer's chassis during transport and unloading. If the load box interlock is in the locked
position, the hook frame shifting cylinder (4) can not be controlled. The hook frame is
controlled only when the rear fender is withdrawn, load box interlock cylinder (5) is unlocked
and the tipping frame is in its resting position.
The system is equipped with hydraulic locks (10) located on cylinders (4, 5, 7). Hydraulic lock
improves safety of trailer operation. In the event of damage to hydraulic system conduits
(rupture, loss of tightness), the hydraulic lock will lock the cylinder in a fixed position.
On the rear beam of the trailer, there are hydraulic outputs terminated with quick couplers-
sockets (12), which can be used, for example, for supplying the hydraulic gate of the load
box.
3.2.9 ELECTRICAL SYSTEM FOR CONTROLLING THE HYDRAULIC SYSTEM
The electrical system for controlling the hydraulic system is designed for 12 V DC supply.
The system is supplied using the connection lead with a 3-pin plug at its both ends. The lead
is used for connecting the 3-pin socket (4) on the trailer with the 3-pin electric socket on the
tractor - see chapter 4.3 (HITCHING AND DISCONNECTING THE TRAILER FROM
TRACTOR). If the tractor is not equipped with such a socket or is equipped with a different
type of sockets, carry out the socket installation according to the recommendations of the
3.19
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