Had a similar experience on a Pasquila tractor. Used a lot of RTV after welding rim, but, tire and rim did hold air(too impatience to wait for a tube).
Another unrelated post by FlipYears ago, I almost bought a Case with an inline 6 diesel in it. I said almost. Was too big for my needs at the time.
Nice looking tractor. Those Case tractors from that vintage would lug down so you almost count the fan blade revolutions and come back without stalling.A couple of pictures I found. Dug up from 2001. I bought this tractor from the original owner. It's a 1966 model. I have a Westendor loader on it now.