Folks, as per the last post on the first page (although I admitt, it wasn't a clear as I was rambling in the moment using my phone to reply)
I have completely eliminated the starting against load by disconnecting the compressed air pipes from the heads so both cylinders are just venting to atmosphere and for the first time ever, it's completely failed to start under 0 load – even when I prodded the fan blade and gave it a good spin, it still didn't go.
So now it won't start at all. And before it would start and either start fine and run well once, then start stalling at high pressures,
So I'm a bit confused – and my motor only appears to have one capacitor, unless there is one inside it somewhere.
Thanks for all the help so far, I'll get this capacitor change as its a cheap and easy thing to do. Perhaps we have 2 faults combined here, maybe it does stall at high pressure, and it's damaged the motor?
Edited By Russ B on 28/08/2016 14:22:42