Cub bent input shaft, questions?

Poonie

Member
I split my cub today to change out the clutch and throwout bearing. I noticed the input shaft has a pretty nice bow in it. No idea how this could've happened bit it explains probably why the throwout bearing disintegrated. Anyway, how difficult is it to change the input shaft? Do I need to take the transmission apart? Any info appreciated.
 
I split my cub today to change out the clutch and throwout bearing. I noticed the input shaft has a pretty nice bow in it. No idea how this could've happened bit it explains probably why the throwout bearing disintegrated. Anyway, how difficult is it to change the input shaft? Do I need to take the transmission apart? Any info appreciated.
It's not difficult, we have done a couple. If you need a good used one( better than buying new) I would contact JP tractor. He may have all the seals and bearings as well.
 

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Follow this link to where someone else had your exact question. The reply pretty well covers it:
Input Shaft Question
Thanks for the link. I just read most of it. Mine isn't as bad as the guys in the link thankfully. Nothing is wrong with my clutch linkage, just the shaft. It's not bent too bad but enough to cause what I think destroyed the graphite throwout bearing. Pieces of it were all inside the torque tube. Also the pilot bearing was kindof beat up. I replaced that though.

The retainer on the shaft looks fairly new so I'm wondering if someone had done this job before.

I saw online where a guy used long bolts in his Trans to allow the torque tube to slid forward but not completely off the Trans. Enough however to allow him to remove the retainer.

So, from what I'm reading once I remove the retainer, the shaft, retainer and bearing simply slides out if the Trans?
 
Yes, the shaft essentially slides out. However, as you pull it out, the upper gears in the transmission will fall off the end. You need to have the top cover off so you can catch them. You will need to slide them back on as you reinstall the shaft.

You need to make sure the parts that hold the throwout bearing in place are in good shape and keep the bearing in line. Problems with those parts are more likely to have contributed to the bearing failure than a bent input shaft would have. Also, be sure to start soaking your new throwout bearing in light oil as soon as you get it. Let it soak until you are ready to install it, at least over night. Then pump it full of cheap grease at installation.
 
I checked the yoke support for the throwout bearing. It's in good shape. I read about the graphite bearings and opted to go with the roller bearing type of throwout bearing instead. I've heard good and bad regarding both types, but the non graphite roller bearing type bearing seemed the better option to me. Especially after seeing the condition of the bearing I pulled out of it. I do have the graphite bearing thst came with the clutch kit as a backup.
 
I had to replace my Cub shaft when I restored mine several years. I think what happens is that the shaft goes directly into the transmission and when people take it apart the weight of the torque tube is supported by the shaft if you aren't careful and don't support it. On the other Farmalls there is a U-joint before it goes into the transmission so there isn't direct stress to bend the shaft.
 
How the heck do they get bent? I had one that was bent. Everybody told me it was fine and to just run it. It wasn't fine, and cost me $150 and any profit I made from that tractor.
 

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