PRONAR T680, Operator'S Manual, Page: 60 / 147

Pronar T680 SECTION 2
3.14
used for supplying the trailer's valve from the tractor's electrical system. In case of an
inadvertent disconnection of this lead, the brake valve will automatically activate the
machine's brakes. The same emergency braking is activated by switching off the tractor's
engine or deenergizing the solenoid valve.
Electro-hydraulic brake valve (1)- figure (3.9) adjusts braking force depending on setting.
Switching to a suitable working mode is done manually by the machine operator using the
lever (2) prior to moving off. Three working positions are available: A - "no load”, B - "half
load” and C - "full load”.
TIP
The hydraulic brake system of the trailer is filled with L-HL32 Lotos hydraulic oil.
ATTENTION
Pressure of the electro-hydraulic brake valve (1) – figure (3.9) - is set by the Manufacturer
and must not be adjusted during the trailer operation.
3.2.4 HYDRAULIC TIPPING SYSTEM
Hydraulic tipping system is used for automatic unloading of trailer by tipping the load box to
the rear or sideways. The hydraulic tipping system is supplied with oil from the tractor's
hydraulic system. Hydraulic oil manifold of the tractor's external hydraulic system is used to
control the load box tipping mechanism.
The trailer system consists of two independent circuits:
•
circuit (A) - to supply the trailer's hydraulic cylinder,
•
circuit (B) - to supply of the second trailer's hydraulic ram cylinder, if two trailers
are hitched to the tractor.
Three-way valve (2) – figure (3.10) is used to activate these circuits. This valve's lever can be
placed in two positions:
•
1 - trailer's tipping circuit opened - circuit (A),
•
2 - second trailer's tipping circuit opened – circuit (B).
On the connection conduit, in the vicinity of plug (4), there is a decal (8) identifying the supply
conduit of the hydraulic tipping system.