Shimano SG-8C20 Service Manual - Page 13

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Troubleshooting Chart

Gear shift

Cable is incorrectly

is not

adjusted.

possible.

Remove the wheel

from the frame and

check whether gear

shifting is possible.

While

Shifting lever indicator doesn't match hub

pedaling.

shifting position.

Turning is stiff.

Gear Unsmooth

Cone Unsmooth

While not

Free rotation is stiff.

pedaling.

Following treatment is for 8C

Trouble condition

Braking is too sudden.

While

braking.

Braking force is weak.

Pedal turning angle for brake

to operate is too large.

Wheels lock when bicycle is pushed back-

ward.

A squeaking sound caused by lack of lubrica-

tion can be heard.

Brakes do not release.

Trouble condition

Gear shifting is

possible:

When the shifting

lever doesn't

operate.

Gear shifting is not

possible.

When the hub

doesn't work.

Except 4.8

Set the shift lever to 4th. Then turn the

cable adjusting barrel to align the red

setting lines on the cassette joint

bracket and pulley.

Replace the shifting lever.

Replace the carrier unit and

hub axle unit.

Replace the carrier unit and hub axle

unit.

Replace the hub axle unit and

4.8

carrier unit.

Replace the carrier unit.

Replace the hub axle unit and

4.8

carrier unit.

Replace the carrier unit.

Replace the right hand cone and

driver.

Replace the shell, ball retainer and

driver unit.

Replace the brake shoe unit, Driver

unit & axle unit.

Replace the brake shoe unit.

Replace the brake shoe unit, Driver

unit& axle unit.

Replace carrier unit, driver unit and

clutch unit.

Apply grease or replace the brake

shoe unit.

Replace the brake shoe unit and

carrier unit.

Remedy