4020 lift arm

If that doesn"t work or is too much then you could try a salvage yard. I have bought several parts from Neslon Parts in NY. I"ve only bought a few things from him but his prices seemed to be pretty good. He advertises in Lancaster Farming and his number is 1-800-730-4020. I have no connection to him other than purchased a few parts.

BTW. www.jdparts.com is a great site, all you have to do is register and then you can log on and see the parts catalog and get prices.

I had mine ('68 4020) apart this spring. I'd rested the top link over to the side and when I lifted the three point the end of the top link rested on that knob and bend the shaft 90 degrees. I found that the knob, the shaft, and the latch are pressed together, no fasteners. Your knob can probably be pushed back on. If its loose a drop of Loctite will hold it as strongly as if it was a push fit. I spent a while with the hydraulic press straightening the shaft and pushed it out of the latch. I never did get it really straight, so I came home to the shop, picked out a piece of steel the same diameter and milled a flat. You could get there with a grinder or file too. I had to braze up the hole on the plate because it was stretched after I bent the plate back in shape. I pressed the new parts together and its working fine. Don't forget the spring.

Might there be a drain hole underneath that you could poke a punch up to loosen the latch? It might take a bit of heat and some Kroil but it ought to come out.

The lower link is available from salvage yards and after market. Even maybe from YT. More likely from that place in Indianola. Upper links show up on epay regularly.

Gerald J.