Bosch BDU3740 Bedienungsanleitung

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

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

English – 3

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)

English – 4

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 of140°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 30cm 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-

Tool3 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)

English – 6

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 DriveUnit

PerformanceLine

CX/Cargo/

CXRaceEdition/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 23to104

Storage temperature °F 50to104

Protection rating IP54

Weight, approx. lbs 6.6

A) Not compatible with the rim magnet

Bosch eBike Systems uses FreeRTOS (seewww.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 <70dB(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 70dB(A) and is

80dB(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.

0 275 U07 3D1 | (20.03.2023) Bosch eBike Systems

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Assembly

Checking the speed sensor (see figure A)

2–8 mm

5–15 mm

(1)

(3)

(2)

(4)

(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 2mm, yet no more than 15mm.

The correct distance between the magnet and sensor

must be maintained (see figureA) 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

20mph.

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

20/28mph. When the speed falls below 20/28mph,

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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