I have a Doosan DMV4020, and it has sat for the last year or so without running. When we fired it back up, the magazine motor was shorted to ground, so it was changed. Now when trying to run it, the dog on the motor will make the pot counter prox, but the motor will overshoot the prox, causing a "Mag Synchro error" The error will clear if i run the motor backward by hand a half turn to get the prox to make, but it will over-run every time the magazine turns either direction, in either auto or manual. Has anyone had a problem similar to this? Any help would be appreciated greatly.