HYDRAULIC SYSTEM

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".

Control Element Functions

1. Lifting switch a -Transport, lifting b -STOP c -Regularity of lowering (working) d -Free position, fast sinking- automatic return of lever to (c) position by a spring

2. Blocking (in transport position)

3. Lowering speed

4. Setting the position of lifting device

5. Upper position restriction

6. Smooth setting - of manual control - automatic control

7. LED - diagnostic

8. LED – lifting

9. LED – lowering

10. Engaging compensator (softening vibrations)

11. LED – softening vibrations engaged

EQUIPMENT “OFF”

Electric installation deactivated with the key of the switching box. The electronic system is off, the lifting device is blocked.

Blocking Cancellation

When you switch on the electric installation with the key of the switching box (I), the lifting device remains blocked electronically - the lifting and lowering function is deactivated; on the EHR-B control panel the diagnostic LED (7) and the vibration dampening LED (11) shortly light up - the system self-test is in progress. The lifting LED (8) and the lowering LED (9) are off. After a short time permanent illumination of the diagnostic LED (7) indicates the state of EHR-B blocking. If the diagnostic LED (7) is permanently illuminated, the control circuits are disconnected.

The engine can only be started if the engine (1) is in position (b).

The EHR-B electro-hydraulic system is only active when the engine is started. Activation of the EHR-B system is only possible when the lubrication indicator has gone off.

The blocking can only be cancelled (system activated) with the engine running by moving the lifting lever (1) to position (a) - short-time switching is sufficient. By moving the lever (1) to position (c) you will bring the three-point hitch to the position corresponding to the element setting, i.e. the current position of controls (4), (5), (6).

After the activation of the system EHR-B first for safety reasons limits the lifting speed of the hydraulic arms.

When the hydraulic arms first reach the selected position, this safety limitation is cancelled and then the lifting speed of the hydraulic arms is normal.

Quick Sinking

Lever (1) in position (d) - free position. You must hold the lever in this position; after releasing the lever will return to position (c) - the system works in accordance with the setting of controls (3), (4), (5) and (6).

Transport Of Implements

Shift the lifting lever (1) to position "a" and block it with the moving latch (2). Blocking the lifting lever (1) by the moving latch (2) in position (a):

A - Lever movement blocked

B - Lever movement not blocked

When the tractor with an attached implement is stopped, the implement must be lowered onto the ground (it must not be left in the lifted position).

Stop Position

By moving the lever (1) to position (b)STOP position - you will immediately stop the movement of the three-point hitch.

VIBRATION COMPENSATOR (DAMPER)

It is used during transport of a heavy implement attached to the rear three-point hitch. After activation of the vibration compensator (10) the arms of the rear three-point hitch sink by approx. 4%, which allows oscillation of the arms in the range of approx. 8% of the lift. The upward oscillation is always limited by the position of the upper position limiter (5).

Advantages of active dampening of vibrations during transport of a heavy implement attached to the rear three-point hitch.

1. Increased operation safety (the steering axle is not unloaded so much

2. Stabilization of the transported implement

3. Reduced dynamic stress of the hydraulic system and the rear three-point hitch

During the adjustment of the hitch for a single-axle semi-trailer the vibration compensator must be off.

LIMITATION OF THE UPPER POSITION OF THE THREE-POINT HITCH

It is activated with the control (5). The limitation can be implemented in the upper half of the three-point hitch lift.

Lowering Speed

The lowering speed of the three-point hitch is set with the control (3).

Symbol of the maximum lowering speed