If the air gap is wider than permitted, it must be readjusted.

Overview:

Due to the wear of the brake lining as the motor is braked, the brake rotor gradually becomes thinner. The anchor plate is thereby pressed ever further toward the brake rotor during braking and the air gap thus becomes wider. If the air gap has reached its maximum width, a gap limiter prevents the anchor plate from being pressed any further, thus ensuring that the anchor plate is reliably ventilated. When the gap limiter is employed, the braking effectiveness gradually lessens.

As soon as the travel motor stops running, the anchor plate presses against the brake rotor through spring force, braking the travel motor. An air gap appears between magnet body and anchor plate. When the travel motor starts up, the magnet body pulls the anchor plate off the brake rotor, allowing the travel motor to freely turn.

If the brake lining is worn, the air gap will be larger. See Inspecting the brake on the drive with the helical gear unit. If the air gap is larger than maximally permitted, the brake must be readjusted. If the brake rotor is too thin due to wear, it must be replaced. See Inspecting the brake on the drive with the helical gear unit.

   Unscrew and remove screws (4x).

   Take off the fan cover.

   Unscrew the hexagon head screws (3x) by a half turn.

   Screw in the banjo bolts (3x) by a half turn in the direction of the magnet body.

   Read off the minimum width of the air gap from the table.

   Insert the appropriate feeler gauge directly next to one of the hexagon head screws in the air gap between magnet body and anchor plate.

   Tighten the hexagon head screws so that the feeler gauge can still be pulled from the air gap.

●   The air gap on this hexagon head screw is now adjusted to the minimum width.

   Repeat the steps for all hexagon head screws (3x).

   Screw the banjo bolts (3x) in the direction of the motor until hand-tight.

   Tighten the hexagon head screws (3x).

●   The brake is fixed with screws.

   Check the air gap next to all three hexagon head screws. If different than the minimum width, repeat the adjustment.

   Attach fan cover.

   Tighten screws (4x).