MAINTENANCE
9-4 MS 3000 • 9095-032A
The stator has a built-in braking coil (5)
which produces a strong magnetic field
when a DC current is applied to it.
When the brake is to be released, a
current is made to flow through the braking
coil. The resulting magnetic field "pulls" the
anchor disc toward the stator, thus
releasing the brake.
It is also possible to release the brake
manually. If the manual release lever is
pressed in the direction indicated by the
arrow on the cover, the anchor plate is
moved against the spring pressure with the
aid of two ball bolts, so that it is pressed
towards the stator, releasing the brake.
9.3.2 Maintenance
In normal use the motor brake is more or
less maintenance free. However, after
frequent raising and lowering of the
platform it may be necessary to adjust the
air gap between the anchor disk and the
stator, and if necessary, to replace the
rotor.
In order to check the condition of the brake,
the width of the air gap "a" and the
thickness of the friction material on the
rotor must be measured every three
months.
The air gap "a" is adjusted by the
manufacturer to 0.3 mm and must never be
more than 1.1 mm.
To check:
1. Switch off the mast climbing work
platform at the mainswitch and
secure the switch with the padlock.
Fig.9-1 Motorbrake
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