PRONAR T286 Operator's Manual page 65

SECTION 3
TIP
The hydraulic system of the trailer is filled with L-HL32 Lotos hydraulic oil.
The hook trailer is equipped with the central hydraulic system with the system of electro-
hydraulic protections. The trailer's system operation is controlled by hydraulic manifold (1),
which is supplied by the tractor's external hydraulic system through two hydraulic conduits
terminated with quick couplings (7). The manifold operation is controlled by means of the
main control panel which is located in the tractor cab. Functions of the control panel are
described in chapter 4.5.1.
The central hydraulic system controls the following functions:
• withdrawing and extending the rear fender (rear underrun protection device),
• locking the suspension,
• lowering and raising the tipping frame by means of two cylinders,
• withdrawing and extending the telescopic hook frame,
• locking the load box,
• rear outputs, e.g. connecting the load box gate.
The trailer is equipped with rear fender which is withdrawn and extended by means of two
cylinders (6). Depending on the length of the transported load box, proper length of the
fender should be set. Oil pumped under pressure from the tractor's hydraulic system is
supplied to the manifold (1). Oil from the manifold is delivered to flow divider (11), which
divides the oil stream proportionally to cylinders (6).
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 (5) - figure (3.18) are always extended
when rising cylinders (2) are supplied and folded when the tipping frame is in the resting
position.
When extending the raising cylinders (2), the limit valve (9) is activated to prevent unlocking
the rear axle support suspension. The suspension will be unlocked when the raising cylinders
3.25
Pronar T286