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PTO/Transmission shaft gap
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- 10+ Years
- Posts: 339
- Joined: Wed Aug 15, 2012 8:00 am
- Zip Code: 31553
- Tractors Owned: 1966 Int'l Cub, C-2 mower 2005 Farm-Trac, 7ft Harrows and Box blade 1976 Int'l Cub, Woods 59 mower, Turn Plow, Full set of cultivators, Harrows, 174 Planter & Fertilizer unit 1953 Farmall Cub,full set of spring cultivators, wheel weights,
PTO belt pulley, snow plow and misc parts. - Circle of Safety: Y
- Location: S/E Georgia
PTO/Transmission shaft gap
I rebuilt the PTO assy during the winter and this week was the first opportunity to give it a test. I mowed for approximately 100 yds and out it jumped again. Upon examination I discovered there is about a 3/8 to 1/2 inch gap between the shafts. With a light I could observe the PTO clutch as I moved it in and out of gear and it appears to work as it should. My research tells me it might be the result of someone in the past installing the front transmission bearing retainer backwards. I've mowed with this cub for 5 yrs and it seems if this was the case it would have moved forward before this. Anyway, my question is, is it possible to pry this shaft back into the proper position without breaking it in half? I guess it's obvious I don't want to have to do this. All suggestions/advice is appreciated. Thanks, Tom.
If you always do what you've always done -- you'll always get what you've always got!
- Glen
- 10+ Years
- Posts: 6096
- Joined: Mon Mar 19, 2012 7:33 pm
- Zip Code: 00000
- Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
- Circle of Safety: Y
- Location: Wa.
Re: PTO/Transmission shaft gap
Hi,
It sounds like the front seal retainer is probably installed backwards.
If you have the PTO out of the Cub, you could put pliers on the rear end of the clutch shaft, where the splines are, and see if the shaft will move forward and rearward.
Have the transmission in neutral, so there is no gear pressure holding it.
It might move hard, if it has stayed working for as long as it has. If that is what it is, the best way to fix it is to split the Cub, and install the retainer the right direction. The bulged side faces into the trans, then the seal is facing the right way also.
Below is a pic of the seal and retainer from TM Tractor.
It sounds like the front seal retainer is probably installed backwards.
If you have the PTO out of the Cub, you could put pliers on the rear end of the clutch shaft, where the splines are, and see if the shaft will move forward and rearward.
Have the transmission in neutral, so there is no gear pressure holding it.
It might move hard, if it has stayed working for as long as it has. If that is what it is, the best way to fix it is to split the Cub, and install the retainer the right direction. The bulged side faces into the trans, then the seal is facing the right way also.
Below is a pic of the seal and retainer from TM Tractor.
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- 10+ Years
- Posts: 339
- Joined: Wed Aug 15, 2012 8:00 am
- Zip Code: 31553
- Tractors Owned: 1966 Int'l Cub, C-2 mower 2005 Farm-Trac, 7ft Harrows and Box blade 1976 Int'l Cub, Woods 59 mower, Turn Plow, Full set of cultivators, Harrows, 174 Planter & Fertilizer unit 1953 Farmall Cub,full set of spring cultivators, wheel weights,
PTO belt pulley, snow plow and misc parts. - Circle of Safety: Y
- Location: S/E Georgia
Re: PTO/Transmission shaft gap
Thanks Glen, I guess I knew what the advice/suggestion was going to be and I totally agree. I just cringe at the thought of splitting a cub mostly because I've never participated or observed it first hand. To make the best of a bad situation, I'm thinking it would be easier to make the split at the transmission rather than at the bell housing. Do you agree? Thanks again for your response and take care, Tom.
If you always do what you've always done -- you'll always get what you've always got!
- clintmo
- 5+ Years
- Posts: 466
- Joined: Thu Apr 17, 2014 9:54 pm
- Zip Code: 26033
- Tractors Owned: 49 Cub
55 Cub - Circle of Safety: Y
- Location: Cameron, WV
Re: PTO/Transmission shaft gap
We faced this issue on one of my Cubs at the Bash a few years ago. We couldn't reduce that gap no matter what we tried, including splitting the tractor to check the seal retainer, which was properly installed. In the end we replaced the drive shaft, PTO shaft and coupler with ones with fresher splines and it's been working fine ever since, despite the larger than desired gap. My situation might be anomalous, just thought I'd share.
Clint
Clint
- Glen
- 10+ Years
- Posts: 6096
- Joined: Mon Mar 19, 2012 7:33 pm
- Zip Code: 00000
- Tractors Owned: 1956 Farmall Cub with Fast Hitch, F-11 plow, Disc, Cultivator, Cub-22 mower
- Circle of Safety: Y
- Location: Wa.
Re: PTO/Transmission shaft gap
Hi,
Thanks for the info, Clintmo, I haven't heard of that before.
Sounds like maybe something was off some during the casting, or machining of the castings, so a casting is slightly too long, if you couldn't change the gap using different shafts. Just a guess.
Thanks for the info, Clintmo, I haven't heard of that before.
Sounds like maybe something was off some during the casting, or machining of the castings, so a casting is slightly too long, if you couldn't change the gap using different shafts. Just a guess.
-
- 10+ Years
- Posts: 339
- Joined: Wed Aug 15, 2012 8:00 am
- Zip Code: 31553
- Tractors Owned: 1966 Int'l Cub, C-2 mower 2005 Farm-Trac, 7ft Harrows and Box blade 1976 Int'l Cub, Woods 59 mower, Turn Plow, Full set of cultivators, Harrows, 174 Planter & Fertilizer unit 1953 Farmall Cub,full set of spring cultivators, wheel weights,
PTO belt pulley, snow plow and misc parts. - Circle of Safety: Y
- Location: S/E Georgia
Re: PTO/Transmission shaft gap
Thanks for posting your experience trying to reduce the gap on your cub. My PTO problem started at the end of last mowing season and upon the first examination I thought the shifting lever was probably worn to the point where the clutch was not fully engaging. When I removed the assy, the shifting lever was worn about half way and the clutch collar was missing the set screw and there was wear on the PTO shaft. While waiting on the new parts to arrive I removed the PTO assy from an older cub I use for cultivation and stuck it in the mowing cub. It worked just fine so I continued to use it to finish the season. During the winter I replaced the shaft, bearing and seal, clutch collar and shifting lever and believed I was ready for the next season. Next, I think I'm going to try to maneuver the transmission shaft to the rear if that's possible. If that fails I'll probably just swap PTO assy's again and continue mowing. If that works, I'll tackle the split next winter and plan on replacing the main shaft and bearings at that time. Thanks, Tom.
If you always do what you've always done -- you'll always get what you've always got!
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