Shimano EW-7975 Service Instructions

Brand: Shimano

Model: EW-7975

Type: Service Instructions

Shimano EW-7975 is an electronic shifting system that allows you to shift gears with the touch of a button. It is designed for use with Shimano's Di2 derailleurs and shifters. The EW-7975 system is waterproof and can be used in all weather conditions. It is also very easy to install and maintain.

With the Shimano EW-7975 system, you can shift gears quickly and easily, even under load. The system is also very precise, so you can be sure that you are always in the right gear. The EW-7975 system is a great choice for riders who want to improve their shifting performance.

Here are some of the benefits of using the Shimano EW-7975 system:

■ Attaching the heat shrinking tubes

Use an industrial-use dryer to shrink the

tubes from the middles toward the ends,

while trying to expel as much air as possible.

Check that melted adhesive is protruding

from both ends of the heat shrinking tubes.

• If using an industrial-use dryer, make sure

that no burning from the hot air occurs.

Note

• Do not heat the tubes any more than necessary.

• The heat shrinking tubes are important components for waterproofing,

preventing the connectors from pulling out and strengthening the housing

openings, so do not use anything other than genuine parts.

• Because the tubes contain adhesive, do not reuse the electric cables after this

process has been carried out. Use new cables if carrying out any replacements.

■ Routing the cables and junction B inside the frame

1. Pass the front derailleur and rear derailleur cable connectors through the seat

tube and chainstay respectively.

2. Pass the junction and battery cable connectors and junction B through the

down tube. Check that the screws of the bottom bracket shell do not damage

any of the components at this time.

3. Set the cables so that only the front derailleur and rear derailleur cables are

visible inside the bottom bracket shell, and if any extra parts such as cable ties

are protruding, push them back inside the frame.

■ Installation of the battery bracket

1. Set the battery cable into the groove in the battery cable cover.

2. Place the accessory spacers in between the battery bracket and the frame and

then secure them by tightening the bolts.

* If installing the bottle cage, it is easier to install it at this stage.

3. Use the accessory cable tie to secure the battery bracket to the frame.

■ Assembly of the bottom bracket shell

1. When installing the inner cover to the bottom bracket shell, make sure that the

front derailleur and rear derailleur cables pass over the top of the inner cover.

2. Install the inner cover to the bottom bracket adapter.

Adapter

Inner cover

For rear derailleur

Junction B

For battery

For front derailleur

Inner cover

For junction

■ Connection of cables to junction B

Place heat shrinking tubes over the connectors of each cable when connecting

them. Use the larger-diameter ones for the junction cables. Place the tubes

against the cable ties on the junction side so that the connectors are in the

middles of the tubes.

* At this stage, provisionally connect

the front derailleur, rear derailleur,

junction and battery cables and

check the various operations. Once

the heat shrinking tubes have been

fully attached, they cannot be

removed.

■ Connection to the derailleurs

Connect the electric cable connectors to the terminals of the derailleurs.

Insert the connectors so that the triangular marks (

d) on the connectors

and the derailleur terminals are aligned with each other.

Because of the waterproof structure of the connectors and terminals, they

do not fit together rigidly. Be sure to push them together until they connect

with a click.

■ Installation of the grommet

Attach a grommet to the cables at a suitable position, insert the rear part

of the grommet into the hole in the frame, and then push the front part of

the grommet to set it into place.

First, pass the cables for the junction, battery, front derailleur and rear derailleur

through the hole in the frame to the bottom bracket shell.

Note

• Do not remove the cable ties which are secured to the cables. They are

used to stop the cables from moving inside the frame.

• Always be sure to use the TL-EW01 special tool to remove the cable.

• Be careful not to let water get into the terminal.

• Be sure to read these service instructions in conjunction with the service

instructions for the SM-EW79A before use.

Technical Service Instructions SI-7DF0A-003

Routing of the electric cables

Cable connection diagram

EW-7975

* Service Instructions in further languages are available at : http://techdocs.shimano.com

Please note: specifications are subject to change for improvement without notice. (English) © May 2009 by Shimano Inc. XBC IZM Printed in Japan.

One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003 Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222 3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

SI-7DF0A-003-00

Electric Cables (Internal Specifications)

■ Components

■ Routing Map

Names and locations of each part

Junction A

Bottle cage

Front derailleur

Left lever

Right lever

Battery bracket

Junction B