Shimano SG-8C20 Operating instructions

Brake drum
General Safety Information
WARNING – To avoid serious
injuries:
It is important to completely understand the
operation of your bicycle's brake system.
Improper use of your bicycle's brake system may
result in a loss of control or an accident, which
could lead to sever injury. Because each bicycle
may handle differently, be sure to learn the
proper braking technique (including bicycle
control characteristics) and operation of your
bicycle. This can be done by consulting your
professional bicycle dealer and the bicycle
owner's manual, and by practicing your riding and
braking technique.
When securing the brake arm to the frame, be
sure to use a brake arm clip that matches the
size of the chainstay, and securely tighten them
with the clip screw and clip nut to the specified
tightening torque.
Use a lock nut with a nylon insert (self-locking
nut) for the clip nut. It is recommended that
standard Shimano parts be used for the clip
screw, clip nut and brake arm clip. In addition,
use a brake arm clip that matches the size of the
chainstay.
If the clip nut comes off the brake arm, or if the
clip screw or brake arm clip becomes damaged,
the brake arm may rotate on the chainstay and
cause the handlebars to jerk suddenly, or the
bicycle wheel may lock and the bicycle may fall
over, causing serious injury.
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.
Spin the wheel and confirm that the braking force
of the coaster brake is correct.
If the brakes are used frequently, the brake drum
may become hot. Do not touch the brake drum
for at least 30 minutes after you finish riding the
bicycle.
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 the wheel becomes stiff and difficult to turn, you
should replace the brake shoes or lubricate with
grease.
Do not apply any lubricant to the inside of the hub,
otherwise the grease will come out.
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.
CAUTION – To avoid serious
injuries:
Avoid continuous application of the brakes when
riding down long slopes, as this will cause the
internal brake parts to become very hot, and this
may weaken braking performance. It may also
cause a reduction in the amount of brake grease
inside the brake, and this can lead to problems
such as abnormally sudden braking.
NOTE:
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SI-35P0A
SG-8C20
CJ-8S20
Inter-8 Hub
with Coaster Brake
Cassette Joint
Technical Service Instructions
Be sure to read these service instructions in
conjunction with the service instructions for the
Inter-8 shifting lever before use.
CJ-8S20
JAPAN
LOCK
CJ-8S20
JAPAN
CJ-8S20
JAPAN
1.
Install the driver cap to the driver on the right side of the
hub body.
2.
Installation of the cassette joint to
the hub
Driver cap
Driver
Note the
direction
Driver cap
3.
Turn the cassette joint pulley in the direction of the
arrow in the illustration to align the red marks on the
pulley and the bracket. With the cassette joint in this
condition, install it so that the red mark on the
cassette joint is aligned with the red mark on the right
side of the hub body.
Should be aligned
Pulley
Bracket
Cassette joint
Align the red
marks to install. Align the red
marks to install.
Right side of
the hub body
Cassette joint fixing ring
Cassette joint pulley
Align the
yellow marks
to install.
Secure the cassette joint to the hub with the cassette
joint fixing ring. When installing the cassette joint
fixing ring, align the yellow mark with the yellow
mark on the cassette joint pulley.
1)
CJ-8S20
JAPAN
LOCK
2)
Cassette joint fixing ring
Fit the cassette joint
bracket securely.
Turn 45
After installing the cassette joint fixing ring, turn it 45
clockwise.

7R
7R
CJ-8S20
JAPAN
LOCK
CJ-8S20
JAPAN
LOCK
Installation of the hub to the frame
Mount the chain on the sprocket, and then set the hub
axle into the fork ends.
1.
Place the non-turn washers onto the right side and left
side of the hub axle. At this time, turn the cassette joint
so that the projecting parts of the non-turn washers fit
into the grooves of the fork ends. If this is done, the
cassette joint can be installed so that it is almost parallel
to the chainstay.
2.
Hub axle
Fork end
Cassette joint
Groove of fork end
Non-turn
washer
(for right side)
Non-turn washer (for left side)
Chainstay
Different types of left and right non-turn washers
are available for use with standard and reversed
fork ends. Use whichever non-turn washers are
suitable.
Left
Fork end
Non-turn washer
Reversed
Standard 5R / Yellow
6R / Silver
5L / Brown
6L / White
Mark/Color Size
Right
7R / Black 7L / Gray
Reversed
(full chain case)
5R / Yellow = 0
= 0
5L / Brown
20
38
The projecting parts should be on the fork
end side.
Install the non-turn washers so that the
projecting parts is securely in the fork end
grooves on either side of the hub axle.
Mark
CJ-8S20
JAPAN
LOCK
7R
Take up the slack in the chain and secure the wheel to
the frame with the cap nuts.
3.
Fix the brake arm securely to the chainstay with the
brake arm clip.
4.
Tightening torque:
30 – 45 N·m
{260 – 390 in. lbs.}
Non-turn washer
Cap nut
5.
Brake arm
Clip nut
Clip screw
Brake arm clip
Chainstay
When installing the brake arm clip, securely
tighten the clip screw while holding the clip nut
with a 10 mm spanner.
Note:
After installing the brake arm clip, check that the
clip screw protrudes about 2 – 3 mm from the
surface of the clip nut.
Clip nut
Brake arm Brake arm clip
Clip screw
(M6 16 mm)
Tightening torque:
2 – 3 N·m {17 – 26 in. lbs.}
Before using the Coaster Brake, check that the brake
works properly and that the wheel turns smoothly.
2 – 3 mm

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.
May 2004 by Shimano Inc. PIT. SZK. Printed in Japan
C
These service instructions are printed on recycled paper.
Please note: Specifications are subject to change for improvement without
notice. (English)
®
One Holland, Irvine, California 92618, U.S.A. Phone: [phone]
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone]
3-77 Oimatsu-cho, Sakai, Osaka 590-8577, Japan
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