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Wheel Horse Transaxle Rebuild Help


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#1 jrk OFFLINE  

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Posted July 24, 2012 - 10:42 PM

I pulled the trans apart (1989 Wheel Horse 312-8) to inspect all the gears, clean the internals, remove a piece of broken dipstick and replace the snap rings, oil seals and bearings as a preventative measure. However, after looking through the 6/8 speed Unidrive manual - I've found that they do not publish the torque specs for the 4 bolts that hold the differential carrier together.

Can someone verify the torque specs for these bolts? Also do they recommend a "red" Loc-Tite for these bolts since they don't have a split washer to keep them from backing out? The bolts that I'm talking about are Part #65 on the diagram linked below:

http://www.partstree...1-07R10008-0003

Also before I start putting it back together does anyone know if the 1st / Reverse gear (#30) is bigger or smaller than 2nd / 3rd gear (#29). From what I remember the 1st / Reverse gear was bigger and that is the way it appears on the diagram below:

http://www.partstree...1-07R10006-0002

However, usually a larger gear on the input shaft would cause a faster speed so I just wanted to check and see if anyone else might know.

Thanks!

#2 JDBrian OFFLINE  

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Posted July 25, 2012 - 05:01 AM

Can't offer specific help but in general the size and grade of the bolts will give you a good idea of how much to torque them. Also, if that same rearend is used in other equipment you might be able to get the torque speccs from a service manual for that equipment.
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#3 KennyP ONLINE  

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Posted July 25, 2012 - 05:13 AM

Here's a torque chart for bolts:
TorqueSpec.jpeg
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#4 coldone OFFLINE  

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Posted July 25, 2012 - 08:07 PM

I had to rebuild the diff in my hydro transaxle on my D200. I went with grade 9 bolts and lock nuts and used red loctite. There were no torque specs that i know of, so just try to keep them evenly torqued.

I cant speak for any other WH transaxle but on the d series there is a problem of the bolts shearing and dropping the pieces into the case. There is no room between the diff bull gear and case so when the big pieces get trapeed between the two the case looses and cracks. Thats why its recommended to go to grade 9 nuts and bolts for d series.
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#5 GWest OFFLINE  

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Posted July 26, 2012 - 06:10 AM

From service bulletin #273


2.1 When servicing an 8-pinion differential (using 3/8-16 hardware), always replace the

original nuts. Order P/N 108881, which are supplied in a package of four for your

convenience. If the bolts require replacement, be sure to use only Grade 8 or better quality.

Torque value is 30-35 Ft. Lbs.

Garry
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#6 LilysDad ONLINE  

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Posted July 26, 2012 - 07:19 PM

Here's a torque chart for bolts:
TorqueSpec.jpeg


Doesn't it matter what they are threaded into? Steel, cast iron, aluminum???

#7 KennyP ONLINE  

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Posted July 26, 2012 - 07:37 PM

That's probably for a bolt/nut combo. I pulled it from a manual.




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