Dearborn disc plow

I am having trouble with my 3 disc dearborn plow when I try plowing with it ,it pulls the tractor to the left and cant plow a straight line,I have it adjusted right all the blades are cutting the same depth it is level and it has the furrow wheel in the back and that might be where my problem is because I dont know how to adjust it properly I tried it with the 3930 and the 70 hp JD and the 60 hp four wheel Kubota and it pulls them to the left what kind of adjustment do I need to make or do I need to go get a moldboard plow? The soil is some sandy but sod

Try getting the op manual and see what it says. Use a search engine to find one. You can probably get a cheap download, or check the N series websites for a free copy.

If a model 10=245 or 10-246 and you don't have a manual you can go to the other 8n club site and search through their manuals, I just looked at them and it tells how to adjust the furrow wheel. I had a lot of trouble with my Ferguson disc plow and had to put a new 18 inch disc on the tail to make it work. Even after proper adjustments and too much money spent on parts it still wont plow like a moldboard plow will.

I had one of those years ago and used it to work up my tree grove that had grown to grass for 40 plus years( Tough working gumbo) I pulled it with my VA Case I never had it side draft much at all I agree with the others you have something not set right
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willy,
I have had a ferguson disc plow for years and they are similar.
I say the key to a disc plow it the rear guide blade, it must be in perfect to near perfect condition for the disc plow to tract properly.
reason most old disc plows when to the fence row, the rear guide disc blade worn out and the plow would no longer tract.

I would replace the rear disc blade with at least a 18 blade I used a coulter blade and with a torch blew out the attachment holes to match the ones on the old disc blade.
it worked great, if you can not buy a new blade.

but that rear guide blade must be adjusted to tract the plow almost like the alignment on a truck front end,

attached are some pictures of the plows my friend and I have:
the red one is a MF 64 bent tube double disc plow, the gray one is a Ferguson bullet plow (older plow).

as was said go to the ford 8N site and you should find your manual

also I use a chain stabilizer on the right side of my plow, when plowing it is loose, but beware, if you ever hit something like a rock, root and the plow jumps out of the ground, when it come back down, the disc blades hit first and the plow can swing to the left fast, before the rear disc guide wheel can dig in and stop the movement.
you can break a check chain or worst yet, arm get over into the tire.
hope this never happens but I install the chain stabilizer just in case.

I enjoy plowing with the old disc plows, they back up from almost nothing, they will try to turn it under or roll over it and keep going.