Ins p ect i o n | C h ec k i ng t h e b rak e on t h e c h a in hoi st
36
CHECKING THE BRAKE ON THE
CHAIN HOIST
To check the brake, a measurement is made of the air
gap between magnet body and anchor plate, as well
as the brake lining thickness.
Overview:
Air gap (between magnet
body and anchor plate) Brake lining thickness
Magnet body and anchor
plate
Brake rotor with brake
lining
Size Air gap target
value
Maximum
air gap
Minimum
air gap
GM2 0.25 mm 0.6 mm 0.2 mm
GM4 0.3 mm 0.6 mm 0.2 mm
GM6 0.35 mm 0.6 mm 0.3 mm
GM8 0.35 mm 0.6 mm 0.3 mm
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.
This is the point at which the air gap must be
readjusted at the latest. If the minimum lining
thickness has been reached, the brake rotor must be
replaced.
If the width of the air gap is within the permitted range
but usage behaviour leads to the expectation that the
air gap will be wider than permitted before the next
regular inspection, the air gap must be readjusted
now.
OPENING THE CHAIN HOIST
Bayonet nut Motor cover
Release the bayonet nuts.
Detach the connection cable and control cable.
Unscrew the motor cover from the housing.
● The fillister-head screws are secured by O-
rings and thus do not fall out of the motor
cover.
Detach the couplings of the hoist motor and
brake from the control in the motor cover.
UNCOVERING THE BRAKE
Dust guard ring
Pull off the dust guard ring.
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