Hello, I am the proud owner of a 1946 John Deere B, SN 1804XX. I use the tractor namely for scrapping snow, occasionally lifting things and for other odd jobs. After getting a load of gravel, I was using the tractor to smooth out the gravel when I noticed the clutch lever was not staying engaged. Also, there wasn't a snapping noise indicating it was engaged, just the lever falling back into the disengaged position. I shut it down and popped the clutch cover off and noticed one of the castellated nuts was loose due to the cotter pin missing. I spent a few hours getting it adjusted and thought I had it fixed when I was able to get the lever to snap when engaged. I started it up and ran it about 20-30 minutes and suddenly the tractor would not disengage while in first gear! Fortunately I got it to disengage and managed to get it inside the garage without going through the garage. The castellated nut didn't appear to stay tight. I know years prior one of the clutch discs was cracked, however, since the tractor sees minimal usage it was not fixed. SO, I am inquiring to see if anyone has experienced this and might have a clue to the problem. I am thinking clutch discs but I don't know everything. Thank you for your thoughts.