The red line marks the center of gravity/balance point of the compact disc harrow. This means that the machine can be lifted in a balanced manner with a crane at this point. The further the center of gravity is from the pivot point, the more counterweight is required. This results in a negative support load.
Operation
Operation should work in combination with the lifting gear if possible. This is usually realized by a headland management of the tractor, the self-propelled sprayer or slurry tanker.
Single-acting
The linkage is lifted = The oil line of the Power-Lift axle is switched to float position, the axle lifts the machine under its own power. The floating position remains switched on during the entire use The lifting gear is lowered = the oil line is pressurized with oil for 6-8 seconds, the axle is lifted and then the oil line is shut off by the control unit of the towing vehicle (closed middle position)
Double-acting
A valve combination is installed that generates the floating position and the closed center position.
The Power Lift axle is designed so that it always pushes the attachment upwards with the same force. This force is designed so that the top link pin is loose. This shifts the center of gravity further forward. At this point, the machine could be lifted in a balanced manner using a crane.
The remaining weight of the compact disc harrow is now much closer to the pivot point and therefore requires less counterweight. Sufficient weight remains on the attachment point.
On tandem vehicles, the pivot point is located between the axles. The boogie and swing-axle chassis are the least favorable here. Here the pivot point is very far forward. On single-axle and self-propelled vehicles, the pivot point is in the rear axle. The tire size determines the dimension to the linkage/lower link.
Conclusion
- By eliminating the weight furthest away from the pivot point, the weight on the axle (pivot point) is significantly reduced.
- The system provides a remedy for negative drawbar loads.
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