Shimano SM-EW79A-E Service Instructions

Brand: Shimano

Model: SM-EW79A-E

Type: Service Instructions

* Service Instructions in further languages are available at :

http://techdocs.shimano.com

Please note: specifications are subject to change for improvement without notice. (English)

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

ST-7970

SW-7971

SI-7DT0A-004-00

Note

• 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 ST-7970/SW-7971 before use.

Technical Service Instructions SI-7DT0A-004

SM-EW79A-E

Electric Cables

CAUTION

• If using an industrial-use dryer, make sure that no burning from the hot

air occurs.

■ Routing Map

Names and locations of each part

Junction A

■ 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.

Heat the tubes until they become

transparent and until melted adhesive

is protruding from both ends.

• 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.

CAUTION

Cable connection diagram

4 hole type

(Internal-type handlebars)

2 hole type

(Internal type handlebars)

Hole-less type

(External type handlebars)

Connecting the electric cables

■ Connecting to junction B

Insert the connector coming from junction (A) into the connector coming

from junction (B) so that the triangular marks (

d) on the connectors are

aligned with each other. Push the connectors together until they connect

with a click. Because of the waterproof structure of the connectors, they do

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

with a click.

■ Connecting the ST-7970 and SW-7971

When connecting the ST-7970 to the SW-7971, use the accessory

extension cable which is included with the SW-7971 to make the

connection.

■ ST-7970 connection

1. Use the TL-EW01 special tool to connect to

the ST-7970. Set so that the projection on

the connector is aligned with the groove on

the narrow end.

Connector from SM-EW79A-E

junction (A)

Connector from junction (B)

Use the accessory cable ties to secure junction (A) to the outer casing of

the brake cable. In addition, set the connector of junction (A) onto the outer

casing of the rear brake cable as shown in the illustration.

* Run an excess length of cable along the handlebars and secure it to

the handlebars with cable ties.

• Install the battery in order to check the connections. Operate the shifting

switch and check that the front derailleur and rear derailleur both operate.

• Be sure to operate the shifting switch for the left lever once or more to

set the front derailleur to the large chainring position as shown in the

illustration for greater ease when installing the chain. After this, be sure to

remove the battery.

1. When connecting the connectors of the various cables, insert the

connectors into the heat shrinking tube.

2. The cables have colored tubes attached to them for identification

purposes, so when connecting the cables, be sure to match the colors

correctly while referring to the cable connection diagram.

Note:

• Check that there are no foreign particles inside the connectors.

• Check that the directions of the connectors are correct and that they

are securely inserted into the opposing terminals and are not raised

up.

3. After connecting the connectors, be sure to check that operation is

correct before processing the heat shrinking tube.

Holes

■ Components

• Connectors : 3 places

(Right lever / left lever / To derailleur)

Accessories

• Cable ties x 4

Junction A

Left lever

Right lever

• When routing the electric cable to junction (A), allow enough looseness in

the cable so that the ST-7970 / SW-7971 installation position can be

adjusted and so that the handlebars can be turned fully to the left and

right. When routing the electric cable to junction (A), the cable can be laid

underneath the handlebar tape when it is wound onto the handlebars.

• Refer ST-7970 service instructions for button indicator operations.

ST-7970 connection Connecting the ST-7970 and

SW-7971

Groove in the connector cover

Dummy plug

2. Open up the bracket cover and lift up

the connector cover. Connect the

connector to the terminal at the lever

end so that the projection on the

connector is aligned with the groove in

the connector cover. Be sure to push

them together until they connect with a

click. Either the top or bottom terminal

can be used.

3. The remaining terminal can be used for an

additional shifting switch. If not using an additional

shifting switch, be sure to attach a dummy plug to

the unused terminal using the TL-EW01.

• In addition, use the wide end of the TL-EW01 special tool when

disconnecting the connectors. If you pull too firmly on the connectors,

problems with operation may occur. Insert the special tool so that the flat

side is facing toward the derailleur, and then tilt it so as to pull out the

connector. When disconnecting the connector at the lever end, insert the

special tool so that the flat side is facing toward the lever. When

disconnecting the connector of junction (A), insert the special tool so that

the flat side is facing toward junction (A).

■ Routing the electric cables

There are three methods of installation that can be used depending on the

holes in the handlebars.

• Hole size: Width 7 mm / length 21 mm or more

RedWhite

Yellow Green

Extension

cable

ST-7970 (L) ST-7970 (R)

SW-7971 (L) SW-7971 (R)

SM-EW79A-E

* The illustration shows the handlebars as seen

from below.

Shifting switch

SW-7971

ST-7970

Heat

shrinking

tubes

To derailleur

(R) : for right

(L) : for left

Shimano SM-EW79A-E Service Instructions

Shimano SM-EW79A-E Service Instructions

Shimano SM-EW79A-E Service Instructions

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