Bosch BDU3740 Manuel utilisateur
Robert Bosch GmbH
72757 Reutlingen
Germany
www.bosch-ebike.com
0 275 U07 3D1 (2023.03) T / 32
en Original operating instructions
fr Notice d'utilisation d'origine
es Instrucciones de servicio originales
Ownerʼs Manual
Drive Unit
BDU3740 | BDU3741 | BDU3742 | BDU3743 | BDU3760 | BDU3761 | BDU3780 | BDU3781
Performance Line: CX | Cargo | CX Race Edition | SpeedPerformance Line: CX | Cargo | CX Race Edition | Speed
This manual contains important safety,
performance and service information.
Read and understand it along with the
information provided to you by your
bicycle manufacturer before using the
product, and keep it for reference.
Cette notice contient d'importantes
informationes sur la sécurité, les
performances et l'entretien. Lisez-les et
comprenez-les ainsi que les informations
fournies par le fabricant de votre vélo
avant d'utiliser le produit, et conservez-
les pour référence ultérieure.
Este manual contiene información
importante de seguridad, rendimiento y
mantenimiento. Léalo y asegúrese de
entenderlo junto con la información que
le ha facilitado el fabricante de su
bicicleta antes de usar el producto;
guárdelo a modo de referencia.
0 275 U07 3D1 | (20.03.2023) Bosch eBike Systems
English – 1
Table of Contents
Introduction ..................................................................................................................................... 2
About Warnings............................................................................................................................ 2
General Warnings ......................................................................................................................... 2
Using your Manual ........................................................................................................................ 3
Operating your Bosch Drive Unit.......................................................................................................... 4
Safety instructions........................................................................................................................ 4
Product description and specifications ............................................................................................ 6
Assembly .................................................................................................................................... 7
Operation.................................................................................................................................... 8
Maintenance/Cleaning ....................................................................................................................... 9
Cleaning...................................................................................................................................... 9
Taking care of your eBike ............................................................................................................. 10
After-sales service and advice on using products............................................................................. 10
Disposal.................................................................................................................................... 10
Bosch eBike Systems 0 275 U07 3D1 | (20.03.2023)
English – 2
Introduction
About Warnings
This manual contains many DANGER, WARNING,
and CAUTION indicators concerning the conse-
quences of failure to use, assemble, maintain, store,
inspect and dispose of a Bosch-equipped eBike in a
safe manner.
– The combination of the safety alert symbol and the
word DANGER indicates a hazardous situation
that, if not avoided, will result in death or serious
injury.
– The combination of the safety alert symbol and the
word WARNING indicates a hazardous situation
that, if not avoided, could result in death or serious
injury.
– The combination of the safety alert symbol and the
word CAUTION indicates a hazardous situation
that, if not avoided, could result in minor or moder-
ate injury.
General Warnings
Read all safety warnings and all in-
structions. Failure to follow the warn-
ings and instructions may result in
death or serious injury.
Save all safety warnings and instructions for fu-
ture reference.
The term eBike battery used in these operating in-
structions refers to all original Bosch eBike batteries
from the system generation the smart system.
uRead ALL accompanying manuals before riding
the bike for the first time. Your Bosch Drive Sys-
tem comes with additional manuals and documents
provided by the manufacturer of the bicycle and
other components. Failure to read and understand
safety information can result in death or serious in-
jury.
WARNING
uThis manual contains important safety, perfor-
mance and service information. Read it before
you take the first ride on your new bicycle, and
keep it for reference. The manual can also be found
online at www.bosch-ebike.com.
uThis manual is intended to be read together with
the separate user manual provided with your bi-
cycle. Be sure to read all provided documents in-
cluding labels on the product before your first ride.
uTake responsibility for your own SAFETY. If you
have any questions or do not understand some-
thing, consult with your dealer or the bicycle or
component manufacturer.
uSome eBike accessories may present a choking
hazard to small children. Keep these accessories
away from children.
CAUTION
uThe Bosch Drive System adds weight to your bi-
cycle which you may not be used to lift. Avoid in-
jury, use proper lifting techniques.
0 275 U07 3D1 | (20.03.2023) Bosch eBike Systems
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Using your Manual
In addition to the functions outlined here, changes to
software relating to troubleshooting and functional
modifications may be introduced at any time.
Graphics
The bicycle shown in this manual may differ slightly
from your bicycle, but will be similar enough to help
you understand our instructions.
RIGHT-HAND and LEFT-HAND sides are determined
by facing in the direction the bicycle will travel when
going forward. When you see a broken line (------), the
item referred to is hidden from view.
Bosch eBike Systems 0 275 U07 3D1 | (20.03.2023)
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Operating your Bosch Drive Unit
Safety instructions
Read and understand all safety warn-
ings and instructions. Failure to follow
the below warnings could result in death
or serious injury.
Save all safety warnings and instructions for fu-
ture reference.
The term eBike battery used in these operating in-
structions refers to all original Bosch eBike batteries
from the system generation the smart system.
The terms drive and drive unit used in these operat-
ing instructions refer to all original Bosch drive units
from the system generation the smart system.
uRead and observe the safety warnings and in-
structions in all operating instructions of the
eBike system and your eBike.
uDo not make any kind of modifications to the
drive. Do not use any products to increase the
performance of the drive. This will result in you
using an illegal mode of transport in public areas.
Moreover, in doing so, you may endanger yourself
and others; accidents that can be attributed to ma-
nipulation run the risk of high personal liability
costs and possibly even criminal prosecution. In ad-
dition, doing so will generally reduce the service life
of the eBike components. The drive unit and eBike
may be damaged and guarantee and warranty
claims on the eBike you have purchased may con-
sequently be voided.
uDo not open the drive unit. The drive unit must
be repaired using only original spare parts and
only by an authorized bicycle retailer. This will
ensure that the eBike remains safe to use. Unautho-
rized opening of the drive unit will render warranty
claims null and void.
uRemove the eBike battery from the eBike before
beginning work (e.g. inspection, repair, assem-
bly, maintenance, work on the chain, etc.) on
the eBike. When working on permanently in-
stalled eBike batteries, take particular care to
ensure that the eBike cannot be switched on.
Unintentional activation of the eBike poses a risk of
injury.
uDo not remove permanently installed eBike bat-
teries yourself. Permanently installed eBike bat-
teries must only be installed and removed by au-
thorized bicycle retailers.
Under extreme conditions, such as con-
tinuously high loads at low speed when
riding up hills or carrying loads, parts of
the drive unit can reach temperatures
in excess of140°F.
uAfter a ride, do not allow your unprotected
hands or legs to come into contact with the
housing of the drive unit. Under extreme condi-
tions, such as continuously high torques at low
travel speeds, or when riding up hills or carrying
loads, very high temperatures may be reached on
the housing.
The temperatures that may be reached on the drive
unit housing are influenced by the following factors:
– Ambient temperature
– Ride profile (route/gradient)
– Ride duration
– Assistance modes
– User behavior (personal effort)
– Total weight (rider, eBike, luggage)
– Motor cover on the drive unit
– Heat dissipation properties of the bicycle frame
– Type of drive unit and type of gear-shifting
uUse only original Bosch eBike batteries from the
system generation the smart system that the
manufacturer has approved for your eBike. Us-
ing other eBike batteries can lead to injuries and
pose a fire hazard. Bosch accepts no liability or
warranty claims if other eBike batteries are used.
0 275 U07 3D1 | (20.03.2023) Bosch eBike Systems
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Safety instructions for the rim magnet
The following safety instructions must be observed
when handling the rim magnet:
uWarning of very strong magnetic fields: The rim
magnet generates a very strong magnetic field
that may influence the magnetic storage media
(e.g. credit card) and electronic devices (e.g.
clock). There is a risk of data loss and damage to
devices. Do not move any media or devices sensi-
tive to magnetic fields into the immediate vicinity of
the rim magnet.
uWarning of hand injuries caused by parts at-
tracted to the magnet: There is a risk of injury if
your fingers or hands get caught between the
magnet and the objects attracted to it. This may
cause skin injuries (e.g. if metal chips are at-
tracted), crushing injuries, contusions or frac-
tures. You can avoid these by being vigilant and
wearing suitable protective clothing.
uDanger to persons with implants and other med-
ical devices, e.g. pacemakers, defribrillators or
insulin pumps:
Keep these away from the immediate vicinity of
the rim magnet.
– The magnet creates a field which can impair the
function of implants and medical devices.
– To avoid impairments, the rim magnet should not
be held directly in front of the chest.
– A minimum distance of 30cm to the chest should
be maintained.
uObserve all national regulations which set out
the approved use of eBikes.
uPlease observe all local, state and federal regu-
lations when registering and using eBikes.
Privacy notice
When connecting the eBike to the Bosch Diagnostic-
Tool3 or when exchanging eBike components, tech-
nical information about your eBike (e.g. manufac-
turer, model, bike ID, configuration data) as well as
regarding the use of the eBike (e.g. total travel time,
energy consumption, temperature) is transmitted to
Bosch eBike Systems (Robert Bosch GmbH) for pro-
cessing your request, in service cases and for the pur-
poses of product improvement. More information on
data processing can be found at
www.bosch-ebike.com/privacy-full.
Bosch eBike Systems 0 275 U07 3D1 | (20.03.2023)
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Product description and specifications
Intended use
The Bosch drive unit from the system generation the
smart system is intended exclusively for driving your
eBike and must not be used for any other purpose.
In addition to the functions outlined here, changes to
software relating to troubleshooting and functional
modifications may be introduced at any time.
Technical data
Drive unit DriveUnit
PerformanceLine
CX/Cargo/
CXRaceEdition/Speed
Product code BDU3740
BDU3741
BDU3742A)
BDU3743A)
BDU3760
BDU3761
BDU3780
BDU3781
Continuous rated power W 250
Torque at drive, max. Nm 85
Rated voltage V= 36
Operating temperature °F 23to104
Storage temperature °F 50to104
Protection rating IP54
Weight, approx. lbs 6.6
A) Not compatible with the rim magnet
Bosch eBike Systems uses FreeRTOS (seewww.freertos.org).
Bicycle lightsA)
Voltage approx. V= 12
Maximum power
– Front light W 17.4
– Rear light W 0.6
A) Depends on legal regulations, not possible in all country-
specific models via the eBike battery
Inserting a bulb incorrectly can cause it to blow.
Details on noise emissions on the drive unit
The A-rated emission sound pressure level for the
drive unit is <70dB(A) in standard operating mode.
If the eBike is moved without authorization, the drive
unit generates an alarm tone as a key feature of the
<eBike Alarm> service. This alarm tone may exceed
the emission sound pressure level of 70dB(A) and is
80dB(A) two meters away from the drive unit. The
alarm tone is only available after activating the
<eBike Alarm> service and can be deactivated again
via the eBike Flow app.
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Assembly
Checking the speed sensor (see figure A)
2–8 mm
2–8 mm
2–8 mm
5–15 mm
(1)
(1)
(3)
(2)
(4)
A
(1) Speed sensor a)
(2) Spoke magnet
(3) CenterLock magnet b)
(4) Rim magnet
a) Different sensor shape and installation position possible
b) a different installation position is possible
Speed Sensor (slim)
The speed sensor(1) and its CenterLock magnet(3)
or spoke magnet(2) are mounted ex works in such a
manner that the magnet, after a turn of the wheel,
moves past the speed sensor with a clearance of at
least 2mm, yet no more than 15mm.
The correct distance between the magnet and sensor
must be maintained (see figureA) if design changes
are made.
Notes: Ensure that you do not damage the sensor or
sensor bracket when fitting or removing the rear
wheel.
When changing a wheel, make sure that the sensor
cable is routed so that it is not under tension and has
no kinks.
The CenterLock magnet(3) can only be removed and
reinserted up to five times.
Rim magnet
When installing a rim magnet, no sensor is required to
detect a wheel turn. The drive unit itself detects when
the magnet is close to it and calculates the speed and
any other data required from the frequency of the
emergence of the magnet field.
Since the drive unit is sensitive to magnetic fields,
avoid other magnetic fields in the vicinity of the drive
unit (e.g. magnetic clipless pedals, magnetic cadence
sensors, etc.) in order to prevent disruption to the
drive unit.
Bosch eBike Systems 0 275 U07 3D1 | (20.03.2023)
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Operation
An operating unit from the system generation the
smart system is required for starting operation of the
eBike. Observe the operating instructions for the op-
erating unit and additional components from the sys-
tem generation the smart system where necessary.
Notes on cycling with your eBike
Note: The eBike system always starts in OFF mode
for drive units with a maximum speed of more than
20mph.
When does the drive take effect?
The drive assists your cycling only when you are ped-
aling. If you do not pedal, the assistance will not work.
The drive power always depends on the pedaling
force you apply.
If you apply less force, you will receive less assistance
than if you apply a lot of force. This applies irrespec-
tive of the assistance level.
The drive automatically switches off at speeds over
20/28mph. When the speed falls below 20/28mph,
the drive automatically becomes available again.
An exception applies to the push assistance function,
in which the eBike can be pushed at low speed with-
out pedaling. The pedals may rotate when the push
assistance is in use.
You can also use the eBike as a normal bicycle with-
out assistance at any time, either by switching off the
eBike or by setting the assistance level to OFF. The
same applies when the eBike battery is drained.
Interaction of the drive unit with the gear-shifting
You should shift through gears on an eBike in the
same manner as when using a normal bicycle (ob-
serve the operating instructions of your eBike with re-
gard to this point).
Irrespective of the type of gear shifting, it is advisable
that you briefly reduce the pressure on the pedals
when changing gear. This will aid gear shifting and re-
duce wear on the powertrain.
By selecting the correct gear, you can increase your
speed and range while applying the same amount of
force.
Gaining initial experience
We recommend that you gain initial experience with
the eBike away from busy roads.
Test the various assistance levels, beginning with the
lowest level. As soon as you feel confident, you can
ride your eBike in traffic like any other bicycle.
Test the range of your eBike in different conditions
before planning longer and more demanding trips.
Influences on range
The range is affected by a number of factors, such as:
– Assistance level
– Speed
– Gear shifting behavior
– Tire type and tire pressure
– Age and condition of the eBike battery
– Route profile (gradients) and conditions (road sur-
face)
– Headwind and ambient temperature
– Weight of eBike, rider and luggage
For this reason, it is not possible to predict the range
accurately before and during a trip. However, as a
general rule:
– With the same assistance level on the drive: The
less energy you need to exert in order to reach a
certain speed (e.g. by changing gears optimally),
the less energy the drive will consume and the
higher the range per battery charge will be.
– The higher the selected assistance level under oth-
erwise constant conditions, the smaller the range
will be.
0 275 U07 3D1 | (20.03.2023) Bosch eBike Systems
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