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Splined tube/yoke repair


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#1 Schwarzkopf9 OFFLINE  

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Posted December 07, 2016 - 01:54 AM

Anyone ever have luck repairing a worn out spline? I have little experience machining, i may need to take it someplace but thought I'd ask first. I don't want to pay cnhi 705$ for a new shaft...lol i almost had a part laying around to replace it, had it been a little bigger.

 

post-84559-0-53064900-1481093630.jpg    post-84559-0-36697500-1481093662.jpg

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Edited by KennyP, December 07, 2016 - 07:14 AM.
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#2 Schwarzkopf9 OFFLINE  

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Posted December 07, 2016 - 01:56 AM

Don't ask me why those pics are upside down...
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#3 Gtractor ONLINE  

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Posted December 07, 2016 - 03:23 AM

Maybe a local machine shop could cut the splined part off the yoke and weld on a new section? 


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#4 Alc OFFLINE  

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Posted December 07, 2016 - 06:25 AM

That yoke isn't replaceable from the driveshaft ?  How bad are the splines on the mating shaft ?  


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#5 KennyP OFFLINE  

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Posted December 07, 2016 - 07:15 AM

Don't ask me why those pics are upside down...

You probably posted from a phone. That happens a lot. Got them fixed for you.


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#6 skyrydr2 OFFLINE  

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Posted December 07, 2016 - 08:13 AM

You need to build a new assembly..DOH!!! or pay NH $700 smackers.. is this the engine to hydro drive shaft?
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#7 tater195 ONLINE  

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Posted December 07, 2016 - 08:31 AM

would something like this work?

http://www.drivetrai...ke-1-15-spline/


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#8 Billy M OFFLINE  

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Posted December 07, 2016 - 08:52 AM

Could you cut the spline off and weld a spline coupler on it?  Like this one...

s-l1000.jpg


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#9 Arti OFFLINE  

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Posted December 07, 2016 - 09:06 AM

I was faced with the same issue on a Bolens, The replacement spline ujoint is pricey.

I ordered a spline shaft from Here...  http://www.ebay.com/...STRK:MEBIDX:IT 

NOTE this is what fits a Bolens..

Count the splines on yours and measure across the widest part of the shaft to get the coupler that fits your machine.


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#10 chieffan OFFLINE  

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Posted December 07, 2016 - 01:49 PM

I have one on a QT that is just as bad.  Was wondering what to do about it.  Thanks guys, you gave me a couple ideas.



#11 Schwarzkopf9 OFFLINE  

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Posted December 07, 2016 - 03:00 PM

The male side of this spline is still good, no noticeable wear.

That yoke isn't replaceable from the driveshaft ?  How bad are the splines on the mating shaft ?


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#12 Schwarzkopf9 OFFLINE  

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Posted December 07, 2016 - 03:01 PM

This is a great idea! Thanks! Ill talk to my welder buddy and see what he says.

Could you cut the spline off and weld a spline coupler on it?  Like this one...
s-l1000.jpg



#13 skyrydr2 OFFLINE  

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Posted December 07, 2016 - 03:50 PM

I welded one of those couplers into the joint on my snowblower. You need a lathe to bore out the old splines and turn down the od of the spline coupler and press it in and weld .
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#14 Billy M OFFLINE  

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Posted December 07, 2016 - 04:35 PM

I welded one of those couplers into the joint on my snowblower. You need a lathe to bore out the old splines and turn down the od of the spline coupler and press it in and weld .

I was going to comment on that.  I would recommend chucking the assembly up in a lathe to make sure it is true.  At least tack weld it in place on the lathe.  You want the assembly balanced and centered as much as possible to keep vibrations and premature wear on the yoke and shaft at bay.



#15 29 Chev OFFLINE  

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Posted December 07, 2016 - 05:26 PM

As suggested you should be able to purchase a new splined yoke to replace your worn one - check out farm supply places or driveshaft repair places - you will have to know the size and spline count and what the U joint cap diameter and width is.  If it turns out the spline is an oddball there is an article of how I repaired the splines in a Bolens Tubeframe PTO yoke (3/4 - 6 spline) as I could not find a yoke with that size spline in it (I believe it was originally supplied by Neapco but they discontinued it) - here is a link to the article - http://gardentractor...s-tube-fra-r204 .  I used a keyway broach to cut the splines in the collar I made but you could also cut the splines in a lathe by grinding a tool bit to the correct shape, moving the carriage in and out by hand and advancing the cross slide a few thousands at a time to take light cuts.  I did a spline for an input shaft coupler using a small metal lathe on MTF - here is a link to it starting at post 14 - http://www.mytractor...k-together.html . If you decide to use a coupler and cut off your old spline make sure that the coupler and your yoke are made out a material that can be welded - if they are not you may have to turn the coupler down, bore your yoke and press the two together - you could cross drill them in a few positions and use short roll pins to secure them to each other.  


Edited by 29 Chev, December 07, 2016 - 05:33 PM.

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