Welcome to the forum. I'm not familiar with this router but is it possible it was damaged by shipping? Maybe a claim is warranted....
Cheers Chap, yup I found that one and have saved it but had wondered if they did a service manual (a bit like a workshop manual for cars and bikes).mtmc.co.uk
Thanks for the advice there SunnyBob, I've removed the brushes and spun the spindle up but hand as you suggest and it seems pretty smooth and runs on for sec or 2. If I was super critical I could say there's a slight rumble but tbh it just sounds like the bearing spinning and nothing sinister.Remove the brushes and then spin it by hand. If it catches or rumbles then send it back straight away.
If it runs smooth and runs on look at the commutator (the segmented bit that the brushes run over). If its corroded or jagged you can GENTLY sand it smooth. Then buy new brushes anyway.