I found the cause of the problem to be that the gear on one axle was loose. It was able to slide from side to side and partially rotate. I think this must have taken it out of phase with the rods. Simply fixed by cutting the gear off the axle and relying on the rods to transmit power to the second axle. So it does run now and reasonably smoothly too.
Thanks Ruston for this post mine is doing exactly the same as yours, my gears are okay so I can only think it's the quartering of the gear on the axle splines, many thanks sam
Hornby Sentinel - including cranked version
in Hornby
Posted
Thanks Ruston for this post mine is doing exactly the same as yours, my gears are okay so I can only think it's the quartering of the gear on the axle splines, many thanks sam