In layman’s terms, the 300 is the width of a standard domestic vacuum cleaner (30cm), the 350 a bit wider (35cm), and the 450 is a super-wide version for very very big floors (45cm).
The X4, Evolution and BS ranges pre-2017 take a variant of the Domel motor below.(they’re not all the same).

The X7 and many post-2017 models take an Ametek Italia.. Sebo motors are not interchangeable.You must replace like with like..However, the rebuilding technique remains pretty much the same for all the variations..

It isn’t just a case of putting a set of carbon brushes in and hoping for the best.You would expect to need to change at least one of the bearings at the same time if you’re going to rebuild a Sebo vacuum motor.. As with many things, it’s easier to show you than explain it in a post, so for this reason, we have the video below which shows one of our Sebo engineers rebuilding a motor for a customer.. You can click the YouTube button to watch the video on full screen on YouTube..

Here are the parts you’ll need: the bearings are.
and the bearing puller is.If you’re looking for Sebo repairs or service in Accrington, Blackburn, or anywhere in Hyndburn, we’re your North West Sebo vacuum cleaner official service centre.
We’re the main agent.. Sebo repairs in Accrington.Sebo repairs in Blackburn.
Sebo repairs in Oswaldtwistle.Sebo repairs in Darwen.
(Editor: Slim Tripod Heads)