Shimano Alfine CJ-8S20 Service Instructions
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General Safety Information
WARNING
– To avoid serious injuries:
When installing the hub to the frame, be sure to install
the correct non-turn washers to the left and right sides,
and securely tighten the hub nuts to the specified
torques. If the non-turn washers are installed to one side
only, or if the hub nuts are not tightened sufficiently, the
non-turn washer may fall out, which could cause the hub
axle to rotate and the cassette joint to turn. This may
then cause the handlebars to be accidentally pulled by
the shifting cable, and an extremely serious accident
could result.
Obtain and read the service instructions carefully prior to
installing the parts. Loose, worn, or damaged parts may
cause serious injury to the rider.
We strongly recommend only using genuine Shimano
replacement parts.
Check that the wheels are fastened securely before
riding the bicycle. If the wheels are loose in any way,
they may come off the bicycle and serious injury may
result.
Read these Technical Service Instructions carefully, and
keep them in a safe place for later reference.
NOTE:
You can shift gears while pedaling, but on rare occasions
the pawls and ratchet inside the hub may produce some
noise afterwards as part of normal gear shifting operation.
The CJ-8S20 cassette joint should only be used with
sprockets from 16T to 23T.
If using a chain tensioner, use the special CS-S500 18T
or 20T sprocket with chain guard. Do not use any other
types of sprockets, otherwise the chain may come off the
sprockets.
If the wheel becomes stiff and difficult to turn, you should
lubricate it with grease.
You should periodically wash the sprockets in a neutral
detergent and then lubricate them again. In addition,
cleaning the chain with neutral detergent and lubricating it
can be a effective way of extending the useful life of the
sprockets and the chain.
If the chain keeps coming off the sprockets during use,
replace the sprockets and the chain.
Parts are not guaranteed against natural wear or
deterioration resulting from normal use.
For maximum performance we highly recommend
Shimano lubricants and maintenance products.
For any questions regarding methods of handling or
adjustment, please contact the place of purchase.
SI-35Z0C
SG-S500
Hub for Inter-8
Disc Brake
CS-S500
Sprocket with
Chain Guard
CJ-8S20
Cassette joint
Technical Service Instructions
Be sure to read these service instructions in conjunction
with the service instructions for the brake and the shifting
lever before use.
2.
Turn the cassette joint pulley in the direction of the
Installation of the CS-S500
arrow in the illustration to align the red
sprocket with chain guard
pulley and the bracket. With the cassette joint in this
condition, install it so that the red
cassette joint is aligned with the red
1.
Install the chain guard to the right hand dust cap of the
side of the hub body.
hub body, and then install right hand dust cap B to the
driver.
Note the
Right hand
direction
dust cap B
Chain guard
Cassette joint
Right hand dust cap
Driver
Align the red
marks to install.
Chain guard
Right hand dust cap B
3.
Secure the cassette joint to the hub with the cassette
joint fixing ring. When installing the cassette joint fixing
ring, align the yellow
the cassette joint pulley, and then turn the cassette joint
fixing ring 45° clockwise.
2.
Install the CS-S500 sprocket to the driver on the right
side of the hub body with the guard plate facing
outward, and secure it in place with the snap ring.
Align the
yellow
to install.
Snap ring
CS-S500 sprocket
Cassette joint pulley
Guard plate
Driver
Installation of the cassette joint
to the hub
1.
Install the driver cap to the driver on the right side of the
hub body.
Note the
Driver cap
Installation of the hub to the frame
direction
The method of installing the hub to the frame is the
same when the chain tensioner is being used and when
it is not being used.
Driver
1.
Mount the chain on the sprocket, and then set the hub
axle into the dropouts.
When not using the chain tensioner
Driver cap
When using the chain tensioner
marks on the
When using the chain tensioner, be sure to read these
mark on the
service instructions in conjunction with the service
mark on the right
instructions for the CT-S500 chain tensioner.
Should be aligned
Pulley
Bracket
CJ-8S20
JAPAN
CJ-8S20
JAPAN
2.
Place the non-turn washers onto the right side and left
side of the hub axle. At this time, turn the cassette joint
Align the red
so that the projecting parts of the non-turn washers fit
marks to install.
into the grooves of the dropouts. If this is done, the
cassette joint can be installed so that it is almost parallel
to the chainstay.
Non-turn washer (for left side)
Right side of
the hub body
mark with the yellow
mark on
Cassette joint
fixing ring
marks
Use whichever non-turn washers match the
shape of the dropouts. Different non-turn washers
are used at the left and right sides.
CJ-8S20
JAPAN
Turn 45°
Dropouts
Cassette joint fixing ring
Standard
CJ-8S20
Reversed
JAPAN
Reversed
(full chain case)
Vertical
Fit the cassette joint
bracket securely.
7 R
The projecting parts should be on the
dropouts side.
Install the non-turn washers so that the
projecting parts is securely in the dropouts
grooves on either side of the hub axle.
3.
Take up the slack in the chain and secure the wheel to
the frame with the cap nuts.
Dropout
JAP
AN
-8
CJ
S2
0
Hub axle
Note:
When installing a part such as a mudguard stay to
the hub axle, install in the order shown in the
illustration below.
Chain tensioner
JA
PA
N
CJ
S2
-8
0
JAP
AN
CJ
S2
-8
0
Mudguard stay
Hub axle
Dropout
Note:
When installing the hub to the frame, the chain
guard may come off, so check that the chain guard
is securely installed so that it will not come off.
If it is not fully installed, noise may be generated.
Cassette joint
Chain guard
Groove of dropout
Non-turn
washer
(for right side)
JAP
AN
-8
CJ
S2
0
Chainstay
Non-turn washer
Mark /Color
Size
Right
Left
5R / Yellow
5L / Brown
20
7R / Black
7L / Gray
38
6R / Silver
6L / White
= 0
5R / Yellow
5L / Brown
= 0
8R / Blue
8L / Green
= 60 – 90
Mark
These service instructions explain how to use and maintain
the Shimano bicycle parts which have been used on your
new bicycle. For any questions regarding your bicycle or
other matters which are not related to Shimano parts‚ please
contact the place of purchase or the bicycle manufacturer.
These service instructions are printed on recycled paper.
Tightening torque:
Please note: Specifications are subject to change for improvement without
notice. (English)
30 – 45 N·m
{260 – 390 in. lbs.}
PA
JA
N
CJ
S2
-8
0
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Cap nut
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
Non-turn washer
3-77 Oimatsu-cho, Sakai-ku, Sakai, Osaka 590-8577, Japan
C
Non-turn washer
Washer
Carrier stay
Cap nut
PA
JA
N
CJ
S2
-8
0
Aug. 2006 by Shimano Inc. PIT. SZK. Printed in Japan