Thanks for comments
Hoist ropes have been replaced both cars. The original motor was DC and was replaced with a flange mounted Reuland AC. There does not appear to be vibration at the machine, only felt in the car. I will be going back to site to take another look. We did re-adjust roller guides to minimum spring pressure. Vibration is fairly constant in both directions and feels as though it is coming up from the platform. We may look at replacing platform isolation rubber next .... I will try the drifting method to rule out electrical - a good idea.
Thanks again for everyones input!
