Front Outlets Of The Outer Hydraulic Circuit; Connecting Machines And Implements To The Outer Hydraulic Circuit - Zetor CRYSTAL Series Operator's Manual

HYDRAULIC SYSTEM

Front outlets of the outer hydraulic circuit

They are installed on a panel in the right front part of the
tractor.Their installation is bound to a three-section
distributor. They are designed for the control of frontally
attached adapters.The marking of the outlets and their use
is the same as in the case of the rear outer outlets.
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If the tractor is equipped with a three-point hitch, the (F)(3)(4)(N) lever is used for its control.
Quick couplers must not be connected at the time of three-point hitch usage connected because they
are pressurized together like front three-point hitch!
After terminating the work with a front three-point hitch for further usage of the section with quick
couplers 3 and 4 with the connection of three-point hitch, it is necessary to lift the arms of the front
three-point hitch to transporting position and the lever of the cock of the front three-point hitch in the
'closed' position.

Connecting machines and implements to the outer hydraulic circuit

Connecting machines and implements consisting of more parts
During work with agricultural machines that consist of more parts (combinators, skids, harrows) and that
have side frames hat are hinged to the central frame and during transport are folded to the vertical position
by separate hydraulic cylinders controlled by the outer hydraulic circuit of the tractor, the folding of the side
frames must always be controlled by the upward (backward) movement of the auxiliary distributor lever. The
'lifting' branches of the cylinders must be connected to quick-couplers '2', '4' or '6'.
Connecting a rotational hydraulic motor
If a rotational hydraulic motor is connected to an outer outlet of the hydraulic system, its return branch must
always be connected to quick-coupler '0'. In case of connection of the filling (pressure) branch to quick-
coupler 1 or 2 the hydraulic motor is protected by the 'kick-out' function against overloading. This function
interrupts the operation of the hydraulic motor at the pressure value in the filling branch of 17.5 - 1.6 MPa.
Connecting a reversing hydraulic motor
A reversing rotary hydraulic motor must be connected to quick-couplers '1' and '2' for functional reasons.
However, relief valves must be inserted in both the branches in this case as they can reliably limit the
pressure peaks during the stopping of the machine. The oil return lines from these valves are connected to
quick-coupler '0'.
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