MY22H03 - 32_1.0_04.10.2021
158
Cleaning and servicing
7.5.9.1 Checking the derailleur gears
The chain is tensioned by the rear derailleur in
pedelecs with derailleur gears.
1
Place the pedelec on stand.
2
Check to see if the chain is sagging (visual
inspection).
3
Gently press the rear derailleur forwards to
check whether it moves and whether it goes
back into position by itself.
If the chain is sagging or the rear derailleur
does not go back into position by itself, contact
your specialist dealer.
7.5.9.2 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
a eccentric bearing 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 and belt tension in three or
four positions, turning the crank a full
revolution.
Figure 157: Checking the chain tension
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.
7.5.10 Checking the gear shift
1
Check whether 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 can not be
changed correctly.
7.5.10.1 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.
7.5.10.2 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.
7.5.10.3 Checking the derailleur gears
1
Check that there is clearance between the
chain tensioner and spokes.
If there is no clearance or the chain scrapes
against the spokes or tyres, contact your
specialist dealer.
2
Check that there is clearance between the
chain or rear derailleur and spokes.
If there is no clearance or the chain scrapes
against the spokes, contact your specialist
dealer.
10-15 mm
10-15 mm
