Hub failure

AXODE hub failure examined by the TCRA

Example of copper brazing, and the detail that goes into to each unit.

Example of copper brazing, and the detail that goes into to each unit.
Example of copper brazing, and the detail that goes into to each unit.

Example of copper brazing, and the detail that goes into to each unit.

As we have previously promised to many
readers over the past few months, a long due investigation regarding the AXODE converter has arrived.

As many readers have conveyed to us, they are experiencing many hub failures and worn seal conditions. Upon investigation we have to report three known items contributing to this problem.

First and most obvious is concentricity of the impeller hub to impeller bushing. They simply do no run together. Many rebuilders get by with simply replacing the bushing with a press in precision bushing when in fact a finish-in-place type bushing results in a perfect alignment.

As most of us know the factory machines the hub and bushing together for true alignment. This guarantees long hub life and extended bushing wear.

Secondly the finish on the O.D. of the hub must be fifteen or better on the RMS scale to assure reduced friction and heat on the seals matting surface. Burnishing the finish on the hub is better yet for those familiar with the process. Although quite expensive, more and more OEM converters are produced this way.

And finally, if the impeller hub needs to be replaced careful alignment and welding is needed, and protection of the finished surface is required.

Found in issue 08, 2004