Fixed Draft Control M7040

[Captain13]

Finally got off my lazy rear and fixed my draft control. I was tired of implements digging in or floating off the ground. Of course it’s 90 degrees and sunny this afternoon but I needed to harrow and plant before it rains this weekend.

I used a six foot Woods harrow for weight. For some reason (the heat) I left them siting on the ground. After realizing I needed the weight on the lift arms, I raised the harrows about two inches, finally got the jam nuts to break free and started lengthening the linkage rod. Draft control was full back. It took about two full turns on the rod before I got the lifting action on the 3PH. I shortened the rod about 1/2 turn instead of the full turn called out in the manual.

Draft control with harrows worked great, just like it should. I parked the harrows and hooked up to the planter which is significantly lighter. I set the depth with the lift control then pulled back on the draft control until the lift arms started to move. Even with probably a third of the weight, the draft control was flawless. It’s relatively fast acting and smooth. Usually when I reach the end of a row, the planter digs in as the tractor reaches a higher point at the turnaround. Instead of digging in, it raised as it should and allowed me to finish the last few feet of the row.

I’ve read a lot of negative posts about Kubota’s draft control. This is the first time I’ve seen it work as designed. I’m very pleased with the results and glad I finally took the time to take care of this. Kubota should adjust these from the factory and maybe the control is set up for bigger Cat 2 implements. However, if I remember right, the WSM called out 450 lbf which I assume is foot/pounds which is torque, not weight. Either way, it works now.

 

[mickeyd]

Thanks for sharing as it will help others.

 

[Russell King]

However, if I remember right, the WSM called out 450 lbf which I assume is foot/pounds which is torque, not weight.

LBF is pounds force
LBM is pounds mass

LB is pounds and is usually assumed to be the same as LBF

The addition of the last letter is to define a mass unit to the “American” system that is similar to the slug that confuses everyone. The LBM is not the units as the LBF units if you get into the really technical details.

Basically if you stay on earth 1 LBM will produce 1 LBF

Torque is LBF x distance (LBF-FT) but usually shown as ft-lb which is really the unit of work





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[Captain13]

Thanks, Russell. Makes sense. I was thinking torque due to rotational force on the top link which then activates the linkage rod. Overthinking no doubt. :