I have just bought a new 4-6-0 in On30 scale, Item #28697 which is DCC ready. No sound.
The loco runs very smoothly in reverse but has a very distinct "bind" or "lurch" in forward.
I've checked and cleaned the worm gear, idlers and axle gear.
All running gear seems to have ample play when checked at the point of "binding".
Have tried both DC and DCC. Have tried a new Lenz decoder.
All with the same jerking in forward result.

Could this be an electric / electronic problem ?
could the resistors and/or capacitors on the motor cause this problem ?
Any advice will be gratefully received.
Thanks, Max.