Open it up and check - I had a similar issue on an HEQ5. Turned out the gears were FINE, but since Synta in all their cost saving glory decides to peen the gear onto the shaft, the peen can wear (or in my case, was never properly peened!) and then the gear just remains stationary while the shaft turns.
I contacted Tasco, and they sent out a new RA motor assembly for mine, so long as I sent in the old one so they could send it back to Synta for further design refinement etc. The mount was 2 weeks old when it happened!
Personally, I almost expect something to go wrong with these Skywatcher mounts - I know my NEQ6 will eventually - already showing some slack in Dec axis, and it's 6 months old. REALLY becoming totally disenchanted with SW to be honest.
RANT OVER.
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