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North Central, Iowa | Okay, the easy test is having a tech recalibrate it and start there. The other issue could be the sensor but I have never seen those go bad in that series. I asked a old mentor at another dealer and he sent this as well. I have always recalibrated them but this could cause issues as well.
Complaint or Symptom :
While operating a hitch mounted implement in Draft Control hitch may run slightly higher or lower than set point.
Problem or Situation :
1.
Draft Control/Load Depth requires the tractor must be setup and tuned to achieve the best performance.
2.
A known software glitch can cause the hitch to run slightly higher or lower than the set point.
3.
Under Certain Conditions the displayed set point may show an incorrect percent and location.
Solution :
Before starting diagnostics please read DTAC solution 111044 this solution explains the intended operation of the hitch. Once you’ve read the solution, please read and implement the recommendations bellow.
Setup and Tuning
Is the tractor set up correctly?
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Is the tractor running abnormally high continuous wheel slip percentage? .Ideal wheel slip is between 8-12%. If the tractor is continually operating above 12% this may be causing an issue. Follow the instructions in the operator’s manual to properly ballast the tractor. Ensure that you meet the correct weight split, and maintain proper air pressure as well. Note: If you still see high wheel slip add additional weight up to the vehicles weight limit, until continuous slip comes down to 8-12%. Ensure you stay within legal weight limits in your area.
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Ensure the 3 point hitch is set up properly for the implement being utilized and that the implement is set up properly.
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What is the current Hitch raise rate? Follow the operator’s manual suggestion for the implement being operated. If no recommendation exists set to 2.
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What is the current hitch lower rate? Follow the operator’s manual suggestion for the implement being operated. If no recommendation exists set to 2.
Was Draft Control Setup Correctly?
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To ensure the system operates properly, the hitch set point must be set when the tractor is operating at the intended ground speed, in typical ground conditions to the field you will operate in, and with the hitch and implement already setup.
Ensure the customer is running in the correct mode.
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When operating Draft Control or Draft Control + Slip sensitivity, hitch movement is normal and to be expected. As long as the hitch returns to its set point when operating under the conditions in which the set point was stored the system is working normally. If the customer does not want the hitch to move they must operate in position mode. To activate position mode change the Draft Control/Load Depth setting to 0.
Ensure the customer is dissatisfied with the height the implement is running and is not overly concerned with the height indicator.
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With R series an indicator showing the actual hitch position in relation to the hitch depth set point was added. This indicator shows draft control working as the hitch raises up and down to maintain draft load. Some customers may believe their implement is not operating at the correct depth, because the indicator is slightly lower or higher than the set point. This is normal operation of draft control. The 30 series operated in a similar manner but without the indicator the slight movements of the hitch may not have been noticed.
R series tractors will adjust the hitch both bellow and above the set point this is normal.
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With R series an indicator showing the actual hitch position in relation to the hitch depth set point was added. This indicator shows draft control working as the hitch raises up and down to maintain draft load. Some customers may believe their implement is not operating at the correct depth, because the indicator is slightly lower or higher than the set point. This is normal operation of draft control. The 30 series operated in a similar manner but without the indicator the slight movements of the hitch may not have been noticed.
Reset the hitch set point as needed.
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If the operating conditions change from the conditions in which the set point was set the draft load may change which will change the height the implement runs at. This is normal, but if the operator wants the hitch to return to the setpoint, the set point must be reset
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If the ground conditions get harder or softer reset the set point.
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If you change your running speed by 1 KPH or .5 MPH. Reset your set point.
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If making an adjustment to the implement or hitch the set point will need to be reset. For example if the customer has a hydraulic third link and they extend or retract it to optimize their implement, that change will either increase or decrease the draft load on the tractor. The tractor will then raise or lower the implement because the draft load changed. After adjusting the hitch or implement the set point should be reset.
To achieve the best performance the Draft Control setting needs to be tuned by adjusting the Draft Control Setting.
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Draft Control is adjusted by changing the Draft Control/Load Depth setting between 1 and 5.
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At a low setting the hitches movement is minimized in reaction to a change in draft load, and the hitch will stay closer to the set point when draft load increases or decreases.
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At a high setting hitch movement increases in reaction to a change in draft load, and the hitch will raise and lower further away from the set point when the draft load changes.
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If the hitch raises to high or drops to low adjust the draft control lower. If the hitch doesn’t raise or lower enough when draft load changes increase the draft load setting.
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When tuning start with the Draft Control setting set to 1 then adjust up .2 increments until you find the performance you want.
If these recommendations did not fix your issue fill out the attached questionnaire and enter a DTAC Case with the questionnaire attached.
Hitch Questionnaire.pdf
Software Glitch
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Starting at MY17.5 on Large Tractors and with 6R fT4 (SG3 and SG4) a software fix was implemented in production. This correction prevents a glitch where every time the tractor comes to a stop the stored draft load would be deleted, and a new reading would be taken the next time the hitch is lowered to its set point. An addition glitch may cause the hitch to run slightly higher or lower that the hitch set point. The Factory is currently developing a software update for tractors in the field to correct this issue. In the meantime if the tractor is running slightly higher or lower than the set point, you can correct this by resetting the hitch set point.
Set Point Readout and Indicator
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Changing the Draft Control Setting while the tractor is moving with the implement in the ground will cause the tractor to reset the hitch draft load and hitch height set point to the current draft load and hitch height, but the displayed set point will not change, it will show the previous set point. For example if the tractor is set to 16% hitch height and a Draft Control setting of 2.0 and the hitch drafts up to 20% then we change our draft control setting to 2.2 the system will change our set point to run at 20% but the display will still show our set point at 16%.
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Any time you change the Draft Control setting while the tractor is moving with the implement in the ground press the hitch height set button. This will update the displayed set point.
Additional Information :
Software glitch has been resolved:
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on Large Tractor models built MY17.5 or later. See Solution 24063 for PIN breaks.
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on 6R fT4 tractor models with software update 6R_Mid18_PSI44 for software generation 4 (see DTAC solution 108940) and 6R_SG3_CI_PSI46A for software generation 3 (see DTAC solution 98224)
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