Checking The Gear Shift - Bosch i:SY E5 ZR F CX Translation Of Original Operating Instructions

7.5.11 Checking the 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.
7.5.11.1 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.
7.5.11.2 Checking 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.
7.5.11.3 Checking 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.
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.
MY23I0a - 42_1.0_22.01.2024
Cleaning, maintenance and inspection
4 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.
5 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.
7.5.11.4 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 208: 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 sprocket and the toothed wheel.
The crank must also turn without resistance.
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