HEK MSHF, User Manual

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MAINTENANCE
9-5 MSHF • 7295-026A
9.4.2 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 / 0.012 in and
must never be more than 0.9 mm /
0.035 in. The total thickness of the rotor
(including the friction material) must not be
less than 9.5 mm / 0.37 in.
To check:
1. Switch off the mast climbing work
platform at the main switch and
secure the switch with the padlock.
2. Remove the brake release
mechanism using an open ended
spanner.
3. Remove the fan cover from the motor.
4. Use a feeler gauge to measure the
width of the air gap "a" close to the
three hollow adjusting bolts (6).
5. Remove the rubber dust ring and use
a vernier calliper gauge to measure
the thickness of the rotor. Replace the
rotor if the thickness is 9.5 mm / 0.37
in or less.
Fig.9-3 Motorbrake