Thread: Isuzu MSA Gearbox to LT230

Originally Posted by Vern

Exactly what i thought. Its a very clean break.

IME higher grade shafts tend to break like that.

EDIT - as AM says - if it broke at the section change then the shaft may need a redesign to reduce stress concentration (as well as revised heat treatment). A good example of this is the series IIA gearbox halfshaft. The design had an abrupt section change which was the place the shaft always failed. LR revised the design late in IIA production - the revision incorporated a radius at the section change, which actually meant the OD of the revised shaft was thinner at that point than before, however it was a huge reduction in failure rate.

Having trouble posting pics of the break.
Will keep trying.

Here tou go

Bugger all torque involved in that break

Oh yeah. First gear high range up a dirt track. Not a happy camper at all.
It felt like it had just popped out of high range.

Hope it all works out for you Vern.

Before you put the loaner shaft in, is the adapter case in good nick?

Done a quick sketch up of the Outcast adapter measurements in case you really are stuck for a replacement, in case they turn out to be the shortest possible route to getting another unit. Hopefully the loaner will get you home.

http://www.aulro.com/afvb/showthread...64#post2300264

For later, when less focused on your current issues, is your input gear the short or long spline type?

Your shaft failure looks like figure 5 in this

http://www.maintenancetechnology.com...achine-shafts/

So not being able to sleep very well tonight, was thinking as you do, would a better option be to get a flange made that bolts where the adapter shaft bolts and then use a floating axle? Like a rrc cv arrangment with aftermarket flange. Understand?

Originally Posted by Vern

So not being able to sleep very well tonight, was thinking as you do, would a better option be to get a flange made that bolts where the adapter shaft bolts and then use a floating axle? Like a rrc cv arrangment with aftermarket flange. Understand?

Yes. This would also mean you can get the shaft manufactured by someone with a reputation for making and heat treating axles like HTE or a US supplier. A flange with an internal spline is not as critical in terms of material or heat treating.

However - the splines need lubrication don't forget...