Hi Tony
I've got a new bearing for these sitting in my toolbox, I used to work where we had quite a few of these and I used to look after the maintenance of them, if you PM me I'll post it to you.
Quite easy to remove the spindle for belt change, but never dismantle the epicyclic back gear unless you have to, horrible fiddly job to put back together, our very upright foreman fitter used words I never knew he knew whilst grappling with one.
Dave