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3.6 Toothed belt
Check that the toothed belt is sufficiently tight. If tightening
is required, adjust the motor support. The tightness of the
belt can be checked by a spring balance attached to the belt
halfway between the pulleys (see Fig. 5). At a 10 N load the
belt should yield about 5 mm on BUE, and at a 6 N load the
belt should yield about 2 mm on BUL2.
3.7 Motor cable connections
Check that all cable connections within reach are secure.
Apply load
Fig. 5. Check of toothed belt.
Brake disc
Red mark ±25°
from mark on
brake pad
Red mark
Brake pads
Fig. 6. Brake adjustment, type BUE.
14 Maintenance guide BUE/BUL2 | 1ZSC000498-ABH en, Rev. 1
3.8 Overhaul type BUE
3.8.1 Disc brake
Wipe the brake disc free from grease.
See Fig. 6. The kinetic energy in the motor and the toothed
wheels should be absorbed by the brake, and the motor-
drive mechanism should stop with a tolerance of ± 25° as
measured on the brake disc (± 125° measured on the hand
crank).
This can be adjusted by tightening both of the spring bolts
on the brake. Using the hand crank, operate the motor-drive
mechanism until the brake is fully open. At this point the
length of the springs must not be less than 35 mm. If the
brake still does not function with that spring length, oil or
grease has entered the brake linings, which will then need
cleaning.
Yield
Clean as follows: Using a pair of tongs, remove the roll pins
that hold the supporting shafts on the brake blocks; see
Fig. 2. Then remove the shaft and the brake blocks. Clean the
brake linings on the two brake blocks with degreasing agent.
When refitting the brake, check that the brake disc is
completely free from grease. Adjust the spring force of the
brake until the motor-drive mechanism stops within the
tolerances given above.
Adjusting nuts
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