Our Lotem 400v year 2001 erratic load plates. Plate is loaded and clamped well with head gripper. Plate is going well on the drum. Back gripper is open and move to plate well. After all gripper pressure arm not going down and drum not start to rotate.
Manually unloaded plate has small mark near to the middle if back edge of the plate. This error can happen on every plate on some plate sizes. On other size or type of plate this error can be very rare. Any ideas?