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4.12.(b): When the angle, through which the pin moves within the slot, does not allow contact
with the sides of the slot, nothing happens!
4.12.(c): When the brake applies, after some minimal amount of lining wear, the pin will contact
the side of the slot in the collar, which will advance the ratcheting mechanism and prepare for
adjustment the next time the brake is released.
4.12.(d): When the brake is next released and the load on the thread is minimal, the free wheel
set-up referred to in the previous paragraph will result in an advance on the thread when the pin
engages the other side of the slot in the collar.
4.12.(e): The ratcheting advancement will continue, a little at a time, until the pre-determined
reserve stroke is reached.
4.13: When the brake is released, the shoes are moved apart to provide running clearance from the
wheel. The actuator’s active stroke establishes the total clearance available for both shoes.
4.13.(a): As the brake releases, the shoe nearest to the actuator has been biased to open first.
This is done during manufacture, by inclining the actuator away from the nearest shoe (See Fig.
2).
4.13.(b): Clearance provided to the nearest shoe is restricted by the (AE) mechanism – located
on the base – which transfers the remaining clearance to the other shoe.
4.13.(c): As shoe wear occurs the friction bolt in the (AE) mechanism relocates to provide a new
reference point for the brake shoe on the actuator side of the brake.
4.13.(c).(i): The total available shoe clearance is determined by the active stroke.
4.13.(c).(ii): The clearance between the friction bolt and holes in the actuator links through which
it passes, determines the “actuator side” shoe clearance.
4.14: Various optional features are available, including latching hand release mechanisms, limit
switches, hydraulic and pneumatic overrides, etc. If the brake covered by this manual has any of
the optional features, they will be listed on the front page of this manual and covered by
supplementary instructions.
8/17/2006 Page 12 of 33 MST/E Electric Shoe Brakes Manual
560022-R6
4.15: The actuator for this series of Mondel Brakes can be supplied with optional, factory installed time
delays.