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7.5.15.2 Checking the hub gear
In the case of pedelecs with a hub gear or back-
pedal brake, the chain or the belt is tensioned by
an eccentric bearing or movable fork end in the
bottom bracket axle. Special tools and specialist
knowledge are required to tension the chain.
Contact specialist dealer.
Remove the chain guard on pedelecs with a
circumferential chain guard.
1 Place the pedelec on stand.
2 Check the chain or belt tension in three or four
positions, turning the crank a full revolution.
Figure 178: Checking the chain tension (example): 5 mm
upwards, 10 mm downwards = 15 mm deviation
3 If the chain or the belt can be pushed more than
2 cm, the chain will need to be re-tensioned.
Contact specialist dealer.
If the chain or belt can only be pushed up and
down less than 1 cm, you will need to the chain
or belt slightly. Contact specialist dealer.
The ideal chain and belt tension has been
achieved if the chain can be pushed between a
maximum of 10 and 15 mm in the middle
between the pinion and the toothed wheel. The
crank must also turn without resistance.
MY23P01 - 22_1.0_21.10.2022
Cleaning, maintenance and inspection
7.5.16 Check gear shift
1 Check that all gear shift components are free of
damage.
2 Contact your specialist dealer if components
are damaged.
3 Place the pedelec on stand.
4 Turn the pedal crank clockwise.
5 Switch through all speeds.
6 Check that pedelec can switch through all
speeds without making unusual noises.
7 Adjust the gear shift if gears cannot be
changed correctly.
7.5.16.1 Checking the electric gear shift
1 Check the cable connections for damage and
corrosion and ensure they are firmly in
position.
If cable connections are loose, damaged or
corroded, contact your specialist dealer.
7.5.16.2 Check the mechanical gear shift
1 Change gear a number of times. Check
whether the Bowden cables get stuck or they
make scraping noises.
2 Check the physical condition of the Bowden
cables for visible damage and check to see if
wire strands are broken.
Have defective Bowden cables replaced.
Contact specialist dealer.
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