1650 flex disc and shaft length

[mattop]

I have my 1650 split, right now. The engine is out and I replaced the shaft seal, performed the engine cradle mod, I pulled the rear out to replace the cork seal and do the trunnion repair.

Based on my serial number, my tractor should have two flex discs at the hydro, however, this tractor only has one. I don't recall a ball falling out of the rear shaft coupler. Would there be a notch in there I can see or feel if it needs a ball?

I did a quick mock-up last night to see how 2 flex joints on the back would work. I think my bolts are long enough, but I'm more concerned about having enough "purchase" on the shaft collar ball join that then end of the shaft fits into. If I add a second rubber disc, it will push the shaft toward the engine, and I don't know what that is going to do on that end.

Should I just keep it simple and stick with one rubber disc? Whats the best way to tell if I'm missing "the ball" in the rear shaft connection?

Thank you for your help!

Matt

[mortten]

Should be able to stick your finger in there and feel the ball if the shaft is off.

[mattop]

I do not feel a ball in there. I've read some of the posts where people have said they have fallen out. Would it be obvious if the ball was missing? Is there a hole there?

Also, my bigger question is will eveything fit up properly if I add a second disc in the back. Are there any signs or clues I can look for that will tell me if it was intended to have two discs as the rear? Like I said, the shaft will not fit into the collar as far because of where the roll pin is on the shaft with two discs in between.

But maybe it's not supposed to fit in that far.

[R Bedell]

I modified my 1450 to have two Flex Disc's on each end of the drive shaft.

[mattop]

Did that require fabricating a new drive shaft?

[R Bedell]

Me....???


Nope, it required drilling some new holes.

[twoton]

Originally Posted by mattop

Based on my serial number, my tractor should have two flex discs at the hydro,

I recall reading somewhere that when they added the 2nd flex disc at the hydro end on the 1650's they deleted the ball bearing???

That being said, my 1650 came with one flex disc and a ball bearing. I added a second flex disc and retained the ball, needed longer bolts.

[twoton]

Originally Posted by twoton

I recall reading somewhere that when they added the 2nd flex disc at the hydro end on the 1650's they deleted the ball bearing???

From Kenneth Updike’s book, Original Farmall Cub and Cub Cadet, page 110,

“The transmission driveshaft was changed at serial number 622952 on the 1250, 1450, and 1650 tractors to improve the machine. The 5/8 CR steel ball at the rear of the driveshaft was removed and the shaft was lengthened. An additional rubber flexible coupling disc was added to the rear of the driveshaft”

I think your mock up will tell the tale whether you need to drill a new hole or not. You're right to be concerned with maintaining enough support from the ball bushing. I had the same concern and ended up filling the existing hole and drilling a new one.

http://www.onlycubcadets.net/forum/s...&postcount=135

Are you replacing the ball bushing? Drive shaft is good? Sounds like you're going through a lot of work, might want to consider replacing those items too?

Good luck.

[finsruskw]

That info is verified in the parts book I have also.
Publication #TC-157