Evaluation of the Partially Parallel Stump Jump Mechanism

The aim of this paper is to report on the features and benefits of the Partially Parallel Stump Jump Mechanism (PPSJM) developed at the University of South Australia. The advantage of the PPSJM is that it allows the share to be kept at near constant tool set angle while in the soil, but still allows it to revert to a conventional position upon engagement with an obstacle. This action reduces share nose rub and permits the use of wide sweep shares which can be made sufficiently light to avoid bulldozing the soil. An Energy Efficient Demonstration Plough was designed and constructed for the purpose of demonstrating the effectiveness of the new mechanism compared to conventional stump jump mechanisms. Tests were conducted at four sites and showed typical draft force reductions of 30-35% but as high as 48% in some cases. Other advantages of the PPSJM include contour following ability, improved trash handling and minimal soil disturbance.