Thanks guys for the replies. I tried using a pipe wrench a couple times on the round end but I couldn't get a good grip on it. Looks like the nut has been on there a long time. I will try spraying it again with wd40 and let it sit for a while. If the nut were hex I think I could get it off with an impact wrench and using the pipe wrench on the other end.
Saturday was my first time using the David Bradley and I got the hang of it pretty quick. At first I had the plow angle too steep and had to keep lifting up on it. I finally got it adjusted about right and it was way less work plowing. It was a grassy field that probably had not been plowed in 20 years. Sure need the discs to cut it up, my roto tiller was not much good on it.
Do you normally have to add some weight to the disc harrow? Or is it better to just change the angle of them on each side?
Edited by DougN, June 24, 2013 - 09:58 PM.