I have an Abbott & Ashby 200mm Industrial Bench Grinder - CS-8GCM I need to change the sanding belt and am unsure how to do it, can you help?

Contact Nutool directly to inquire.

since this is a vague comment, I have to say that some small grinders just do not do well with blade sharpening. I have one that does the same thing when sharpening a blade. It is just too small, horsepower wise, to handle the job.

I suggest doing a search on eBay. Depending on where you live, you may need to find them in another country. A Google search might help first but I found these on eBay Ireland.
2 Pack Of 3 Sanding Belts Nutool Nu Tool NTG6L 6130 Bench Sander

If you can't find the direct replacement check with Grainger or other industrial supply house ... https://www.grainger.com/category/push-pull-switches/automotive-electrical-and-lighting/fleet-and-vehicle-maintenance/ecatalog/N-15m5?okey=push-pull+switches&mkey=Push%2FPull+Switches+&refineSearchString=push-pull+switches&NLSCM=5&EndecaKeyword=push-pull+switches&searchRedirect=push-pull+switches&sst=subset&suggestConfigId=6&nls_boost_words=noContent

Assuming your local tech confirms that your bench grinder tests ok. The problem is probably that the grinder draws too much current for the RCD and is therefore detected as an earth leakage. High amperage devices often do that. Your best bet would be to plug it in to a socket which is on a non-rcd circuit. Maybe you have an RCD on the whole house though? I would start with returning the grinder and trying a different brand with a lower amperage/wattage rating. If that doesnt work, I would call an electrician to discuss installing a different RCD or running a separate circuit for your power tools.

Could be a belt tension issue. Try tensioning the belt by moving the motor and wheels farther apart by reanchoring the units,or,spanning the gap between units with a series of wood blocks and shims(wedges).Be careful with tensioning. Always manualy move the belt,unit unplugged. There should be some deflection(play) in the belt when pressed upon with a finger.

It sounds like the pulley is not adjusted correctly. This is causing the belt to move on you. Carefully inspect and adjust the pulley so it is square and flat. Use a straight edge.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

The capacitor is easy to change and can be matched once you remove it by any electronics parts house.