Transmission Clunk

[gregko]

Good evening, I have a 1950 John Deere B (SN 267148) and it has developed a "clunk" in the transmission. It only happens when in gears on the right side, 1st, 2nd, 4th and reverse. The noise speeds up and slows down with tractor speed. I have blocked the back of the tractor up and put it in gear, held one wheel in place while I rotated the other wheel, can feel and here it in the transmission. Has anyone had any experience with this? I have removed the inspection plate and looked for broken tooth but haven't found anything yet. If you any direction to point me towards to get started I would appreciate it.

 

[ET]

There is most likely a broken tooth on the low range gear. That's the gear change when you move the lever acrossed the bottom slot of the shift pattern.

 

[gregko]

There is most likely a broken tooth on the low range gear. That's the gear change when you move the lever acrossed the bottom slot of the shift pattern.

Okay, I pulled the gear shift column off tonight and found this main gear had some teeth problems. Would this be enough to cause the clunking?

 

[Mike(NEOhio)]

Jack up one wheel and roll it by hand so you can inspect all the gear teeth on all the shafts.

 

[mrslesq]

Good evening, I have a 1950 John Deere B (SN 267148) and it has developed a "clunk" in the transmission. It only happens when in gears on the right side, 1st, 2nd, 4th and reverse. The noise speeds up and slows down with tractor speed. I have blocked the back of the tractor up and put it in gear, held one wheel in place while I rotated the other wheel, can feel and here it in the transmission. Has anyone had any experience with this? I have removed the inspection plate and looked for broken tooth but haven't found anything yet. If you any direction to point me towards to get started I would appreciate it.

I had a G 50+ years ago that had a "clunk". A bearing went out on a transmission shaft that came out of the gear case behind the pulley 10 Inches or so. A ball went all the way down to the bottom taking a tooth out on the PTO drive gear. Of course to use hydraulics you had to run the PTO. We found the PTO shaft and gear used at a guy that had machinery parts and a field of machinery for parts. (which I used later to find a part for a JD 490 corn planter) He had the part out of a tractor. So the tractor went to my Uncle Floyd's : a tractor mechanic. He let me take the transmission apart; all the way to the bottom to get to that PTO shaft/gear. He gave me guidance as a put it back together. My Father had passed and I was still in High School. Mission accomplished!