I have a Heljan Class 14 which runs perfectly in one direction but jerky in the other direction, I have had the wheels out cleaned the wheel backs and pick-ups and bent the pick-ups slightly to give a better contact on the wheels but to no avail, looking at the loco on my rolling road the 'jackshaft' has a lot of sideways movement as the wheels are turning, this seems to due to excessive play.
I thought this might be the problem but as stated the loco runs fine in one direction despite the sideways movement of the shaft.
If anyone has any idea what might be causing this running problem I would be very grateful to know please.
Thanks in advance