On 07/10/2018 18:21, harry wrote:
On Sunday, 7 October 2018 15:48:04 UTC+1, Chris Green wrote:
One of the UJT yokes on our Kubota tractor has failed, one of the
'arms' is broken so no longer retains the needle roller bearing.

Is there any sane way of repairing this as replacements seem nearly
impossible to find. It's a bit of a strange design as the yoke goes
direct onto a flanged shaft (i.e. it has an internal spline) so
finding a non-Kubota replacement is unlikely. However if anyone can
recommend suppliers of (small) UJTs with splined connections I'd be
interested.

--
Chris Green
·

It will be forged. Probably duff post heat treatment.

On reflection I'm sure you are right about forging. But also on
reflection isn't it more likely to be a metallurgical defect than heat
treatment? That's why a photo would be interesting.

It will be a hard one to fix/weld.

Indeed (but we like them, don't we).

The reason for the splined shaft is that UJs do not rotate at constant speed when out of line and axial movement comes in. The spline allows for this.

although you only need one on the "intermediate" bit.

I should concentrate on getting a replacement part.

I certainly would not ignore that possibility. It's not as if it is a
rare machine. You might actually find that parts from Chinese or Eastern
European copies fit.