Grimme GL 860 Compacta
When seeding, it lifts the back axle of the tractor leading to wheel slip, thus making it impossible to maintain a constant speed. It reaches 12 km/h and then drops to 8 km/h and so on. It does not depend on the terrain/field topology. Tried with tractors of different weight (Case Puma and Magnum on Sosnovka) and back wheel/track configuration. The cause could be the 3 point linkage's level which in combination with the GL 860 is too low or the GL 860 does not sink enough into the soil. The same issue can also be seen with the Horsch Terrano 5 FM and Kuhn DC 401 but only in combination with some tractors.
Plant potatoes, look at the back wheels and monitor the speed.
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