Position control keeps your implement at the same depth. A tractor implement is moved relative to the tractor by a hydraulic system controlled by variable resistors dependent on position, and transducers dependent on load, through an electronic control system having an adjustable time constant. Position control allows the implement to drop to a preset depth and no more. So, to summarize: Draft control keeps your tractor from burying the rear tires by raising and lowering the implement as soil conditions change. You can manually set the sensitivity of the draft control to react faster or slower to conditions. The plow causes a constant push and relax on the top link, depending on soil conditions. It keeps lifting until the plow comes out of the ground enough to allow the rear tractor tires to stop digging a hole and start moving forward enough to allow the pressure on the rock shaft to diminish and it lowers the plow back into the ground, eventually back to the pre-determined depth that your position control was set at, unless it hits hard dirt again. The rock shaft activates the 3 point hitch to lift the implement out of the ground. The implement pushes the top link against the rock shaft. It has to maintain the three legs of the triangle. The top link is trying to get shorter but it's solid. Search: Tractor Draft And Position Control Adjustment. Since the rear goes down and the implement does not, that puts pressure on your top link. When the rear of the tractor lowers, the implement does not, because it floats. Your plow has a harder time cutting through the soil, putting drag on the tractor, so the rear wheels start spinning instead of pulling forward.Īs the rear wheels spin, they start digging a hole, which lowers the rear of the tractor. You're in soft easy soil, and all of a sudden you come into some harder soil. Now, let's say you're driving along with a plow in the dirt. There's a rock shaft somewhere at the point that your top link connects to your tractor. There's a triangle formed by three sides:Ģ- the line of your lift arms to implement How draft control works, as explained on my old IH2500b. Draft control actually raises an implement out of the ground, so it cannot be keeping the implement at the same depth. Rachel will help take the guesswork out of the hydraulic system on a Ford 500, 600, 700, 800, 900 tractor or early 2000/4000 tractor with four-cylinder gas e. Position control keeps your implement at the same depth. The principle of his idea is still used and. The position control lever (A) can be moved fully rearward to raise the hitch at the end of the field.Click to expand.That video is incorrect. It was Harry Ferguson, a son of an Irish farmer, who invented in 1925 the so called draft-control for the plough. The position control lever (A) can also be raised slightly to override the draft control setting to help get through slippery spots without getting stuck. Then pull draft sensing lever (B) rearward until desired draft sensing sensitivity is obtained. The operating depth set-up will prevent the rockshaft from lowering all the way when the tractor begins to slip. Set position control lever stop (D) so control lever can be brought back to the same position. With tractor moving, push position control lever (A) forward to set implement operating depth. 128 Double Speed Turn 13, 70 Dowty (Eicher) 13, 105 Draft control 13. Initially place position control lever (A) in its fully rearward position and the draft control lever (B) in the fully forward (least draft) position. 9, 238 Closed loop control 181, 189, 217, 226, 247 Clutch 146, 150, 151 CNH 7. (See Positioning Center Link in this section for additional information.) Placing the lever toward the rear position reduces the amount of draft load required to override the position setting set by the position control lever (A) and raise the rockshaft.ĭraft sensitivity ranges can be changed by repositioning the center link. With lever placed fully forward to the position marked “off” (C), there is no draft sensing. The implement is raised slightly to get through tough spots so you do not have to shift to a lower gear.ĭraft control lever (B) controls amount of load required before hitch responds. The implement will raise and lower to follow the ground contours while maintaining a nearly constant depth. Operating with a fully mounted implement in hill and swale terrain. The rockshaft may be equipped with variable draft control system. A-Rockshaft Position Control Lever B-Rockshaft Draft Control Lever C-Draft Sensing OFF Position D-Position Control Lever Stop
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