If the running surface of a friction wheel is damaged, the friction wheel must be replaced.

  Release the coupling far enough that the plate springs are completely without tension.

  Hold the HBF drive firmly and fold out the plate springs.

  Tilt the HBF drive downward.

  Release the M8x16 rib screws (3x).

  Remove the friction wheel from the HBF drive by taking it out from the top.

  Insert the new friction wheel and place it on the centring hub.

  Screw on the friction wheel with the M8x16 rib screws (3x). 25 Nm

  Close the cover.

  Insert the plate springs in the recess on the HBF drive.

  Turn the coupling far enough so that the plate springs (including the upper and lower discs) are the right length.

─     For connection of the HBF drive on the friction wheel side: H = 59 mm.

─     For connection of the HBF drive on the travel motor side: H = 49 mm.

  Secure coupling with spring cotter.

●   The friction wheel now presses hard enough against the HB profile rail.