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Splined Shaft Coupler

gutbrod

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#1 Gav694 OFFLINE  

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Posted May 19, 2014 - 06:38 AM

Not sure which section to post this in so I thought I would try here.

 

I am restoring a Gutbrod rotovator for my Elf but found a female-female splined coupler inside the gearbox has split due to the shaft inside it rusting and swelling up, I cant just weld it up as an oil seal runs on the outside of it so I need to find a replacement

It has 13 teeth and the shaft that fits into it measures 21.36mm in diameter, does anyone know if this is a standard size and if it is metric or imperial 

 

or even better where to get one

 

cheers



#2 olcowhand ONLINE  

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Posted May 19, 2014 - 07:12 AM

Granger in the USA has a 7/8" shaft 13 spline.  The 7/8" is only .030" larger than your measurement, and wonder if maybe your shaft is worn at point of measurement?    Here's a link to the splined collar.


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#3 boyscout862 ONLINE  

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Posted May 19, 2014 - 08:08 AM

Surplus Center and Baileys may have them too. Good Luck, Rick


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#4 Bruce Dorsi OFFLINE  

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Posted May 19, 2014 - 09:13 AM

 

 

 

 I cant just weld it up as an oil seal runs on the outside of it

 

 

If you are not able to locate a replacement, you may have to weld it back together.  ....It should be an easy job in a metal lathe to turn & polish the weld area to restore the sealing surface. 


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#5 Gav694 OFFLINE  

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Posted May 19, 2014 - 04:24 PM

Thanks for the replies guys,

 

I prefer the price of the one that the surplus centre has but I need to be sure of the size before I order as the shipping wont be cheap to the UK.

 

I was considering welding but thought it would be soft and the oil seal may wear it down



#6 olcowhand ONLINE  

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Posted May 19, 2014 - 05:34 PM

Oh yes, Surplus Center is the price leader!  I couldn't get their pages to load for me when I looked up Granger.



#7 Gav694 OFFLINE  

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Posted June 03, 2014 - 04:58 PM

Here are some photos of the coupler in question

IMG_2527.JPG IMG_2523.JPG

IMG_2522.JPG



#8 coldone OFFLINE  

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Posted June 03, 2014 - 05:46 PM

Gav, If you have a hydraulics place around they may be able to help. I have seen alot of Hydraulic pump couplers that are splined and my fit your shaft.


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#9 olcowhand ONLINE  

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Posted June 03, 2014 - 07:20 PM

Hmmm....how far up the coupler does this seal ride?  If just a short distance, then is there room to have a collar machined that will press interference fit on the outside, but leaving the original seal area protruding?  If pressed on, the crack should close nice & tight, and I think it would still seal.


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#10 skyrydr2 OFFLINE  

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Posted June 03, 2014 - 08:08 PM

Is it only cracked ?? If so silver solder it back together , sand or file in a lathe and install it !! Easy Peasy!! Or send it to me and for a small fee I will make one for you out of D2 steel .
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#11 olcowhand ONLINE  

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Posted June 03, 2014 - 08:11 PM

Is it only cracked ?? If so silver solder it back together , sand or file in a lathe and install it !! Easy Peasy!! Or send it to me and for a small fee I will make one for you out of D2 steel .

 

 

You can do the broach work or how do you cut the splines?



#12 skyrydr2 OFFLINE  

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Posted June 04, 2014 - 02:54 AM

You can do the broach work or how do you cut the splines?


Yup! And I can make um out of carbide if you need one that hard ;-)

#13 Gav694 OFFLINE  

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Posted June 04, 2014 - 02:30 PM

I have left it with the welders at work to see what they can do to repair the crack.

 

For the sealing surface I plan to have a sleeve turned and press it on. the original seal was 30mm ID but I can get one that is 31mm ID and it will still fit into the housing.

the bigger seal combined with turning a bit of the OD of the coupler should allow a sleeve with a thick enough wall to prevent it splitting when pressed on. I Hope :D

 

Keith if you do internal splines in carbide do you spark them out?



#14 olcowhand ONLINE  

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Posted June 04, 2014 - 02:42 PM

Best to freeze the coupling before putting the sleeve on.  This will ever so slightly contract the coupling, allowing the sleeve to go on much easier.  Then when the coupler warms up, it will expand into the sleeve, making a very tight fit.



#15 Gav694 OFFLINE  

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Posted June 04, 2014 - 03:21 PM

Best to freeze the coupling before putting the sleeve on.  This will ever so slightly contract the coupling, allowing the sleeve to go on much easier.  Then when the coupler warms up, it will expand into the sleeve, making a very tight fit.

Will a household freezer be enough or are we speaking liquid Nitrogen







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