3PH Shudder with Draft Control

[The kid]

Draft control is not designed to be used to grade with.

 

[ritcheyvs]

The top hole is solid, not connected to the draft sensor on his machine (and mine for that matter)

Looks like someone else already explained it.

Here is a photo of the bracket in question:



Now I have a question. It seems that a pulling force on the bracket should trigger the draft control (based on looking at the parts diagram). But wouldn't a patch of hard ground cause the plow to pivot on the lower arms and push on the top link? I'm sure that when my box blade hit hard spots (e.g roots) it compressed the top link.

Also another poster (forgot who or when) said draft control made grading easy. But The Kid advises draft control is not for grading. Which is right? What have others experienced.

As an aside, when i moved the top link from the bottom hole (high sensitivity) to the middle hole (reduced sensitivity) all my shudder issues (mentioned at the start of this thread) disappeared.

 

[The kid]

If what your doing works for you then go for it.

Sent via Ipad2

 

[k0ua]

Here is a photo of the bracket in question:

View attachment 372248

Now I have a question. It seems that a pulling force on the bracket should trigger the draft control (based on looking at the parts diagram). But wouldn't a patch of hard ground cause the plow to pivot on the lower arms and push on the top link? I'm sure that when my box blade hit hard spots (e.g roots) it compressed the top link.

Also another poster (forgot who or when) said draft control made grading easy. But The Kid advises draft control is not for grading. Which is right? What have others experienced.

As an aside, when i moved the top link from the bottom hole (high sensitivity) to the middle hole (reduced sensitivity) all my shudder issues (mentioned at the start of this thread) disappeared.

It doesn't matter what happens in the top hole as you have no leverage on the bracket, as it is hinged at that point just behind the hole. If you stick it in the lower hole, you have maximum leverage. the two adjusting screws and lock nuts are also down there.

 

[jeff9366]

Here is a photo of the bracket in question:

View attachment 372248
It seems that a pulling force on the bracket should trigger the draft control (based on looking at the parts diagram). But wouldn't a patch of hard ground cause the plow to pivot on the lower arms and push on the top link? I'm sure that when my box blade hit hard spots (e.g roots) it compressed the top link.

Also another poster (forgot who or when) said draft control made grading easy. But The Kid advises draft control is not for grading. Which is right?

This rotation is the "switch" that turns on the hydraulic flow to raise the Three Point Hitch when a mounted implement encounters an obstruction.

{Any quick hitch product occupying the "eyes" on the Lower Links negates Draft Control.}

Draft control is useful with a Box Blade but not as useful as with a plow, where it is not only convenient but an important safety device.

With the DC properly adjusted, it will raise a Box Blade full of dirt just before the tractor stalls out from lack of power or because the Box Blade encounters a tough spot, reducing the draft force enough so the tractor can continue to move/pull.

Draft Control will automatically raise the plow when it encounters a hard spot so the tractor does not rear up on its back wheels, then topple over.

Draft control one of multiple international patents Harry Ferguson obtained when he invented the Three Point Hitch between WWI and WWII, made possible the "lightweight" tractor as we know it today.

 

[Sawworcs]

Does draft control create down pressure? I was told that it helps not only with a plow working to hard but it also keeps down pressure on implements so you are not just relying on the weight of the implement.?

 

[jeff9366]

Does draft control create down pressure?

No Three Point Hitch provides down pressure. The only down pressure on the soil comes from implement weight, which is why weight is KEY to satisfactory performance of ground contact implements.

If the Three Point Hitch provided down pressure it would lift the rear wheels and traction would be zero.

 

[k0ua]

Does draft control create down pressure? I was told that it helps not only with a plow working to hard but it also keeps down pressure on implements so you are not just relying on the weight of the implement.?

No, Draft control does not provide downpressure. Draft control is nothing but another feedback mechanism to the 3pt hitch that "senses" when the "draft" or pull weight rises on the implement so that the tractor is now in danger of being stalled. This sensing of the increasing pull load causes the 3pt position control to automatically without operator intervention raise the 3pt so as to unload this excess pull load and then automatically lower the 3pt to the original position.

Scenario: you are plowing along nicely and all of a sudden you hit a large root or rock with the plow. the tractor starts to stall and the 3pt automatically lifts, over the obstruction, and then automatically lowers back down to continue plowing at the the preset depth.

 

[ritcheyvs]

...
Now I have a question. It seems that a pulling force on the bracket should trigger the draft control (based on looking at the parts diagram [and service manual]). But wouldn't a patch of hard ground cause the plow to pivot on the lower arms and push on the top link? I'm sure that when my box blade hit hard spots (e.g roots) it compressed the top link.

I think I have answered my own question. I found the following illustration (along with an excellent explanation) in the EX35-50 service manual:



It clearly shows that the draft mechanism functions (lifts) when the top link is in compression. I am glad to have access to this more-recent foreign manual, but I really wish the DK451 manuals (which I bought) were more thorough and had fewer errors (e.g. missing grease fittings, wrong engine, etc.).

 

[ksbrdmkr]

The draft control on the old Allis Chambers and on most bigger tractors the sensing linkage is on the bottom linkage so it is the direct draft(pull) that moves the linkage, on the Kioti it is the rotation to the top link that moves the linkage. I pretty sure there are advantages to either system.