Shimano NEXUS SG-7C26 Service Manual
SERVICE MANUAL
vol.1
SG-7C26
SHIMANO NEXUS 7-SPEED HUB
t
Disassembly of the Inter-7 hub
1.
Hold the two bevelled surfaces
of the hub axle on the brake
arm side in a vice and remove
the dust cap with a screwdriver.
2.
Turn the brake arm unit
upside down and hold
the two bevelled surfaces of
the hub axle on the sprocket
side in a vice.
2
SG-7C26
Tools
Note:
Unit parts should never be
disassembled. If they are,
problems may result.
When replacing parts,
replace the whole internal
assembly or unit part.
Note:
Before carrying out
disassembly, have ready
the hub spanners(TL-7S20)
and internal hub grease.
Note:
Do not damage the threads of
the hub axle.
Vice
Note:
Do not damage
the threads of
the hub axle.
Lock nut
Stop nut
Hub spanners
Part No. 3-130 9890
17mm x 22mm(2 pcs.)
TL-7S20
(Right)
Screwdriver
(Left)
Remove the left hand lock nut
from the hub axle, and then
remove the stop nut.
TL-7S20
3
3.
Remove the brake arm unit
and ball retainer B from
the hub axle.
4.
Remove the hub shell.
5.
Remove the brake shoe unit.
Now it can be replaced
with the new internal
assembly.
Disassembly and assembly can
be carried out quickly.
Part No. 33Z 9801
Ball retainer B
Brake arm unit
Internal assembly
Hub shell
Brake shoe unit
6.
Remove the stop ring with
a screwdriver.
At this time, the stop ring
come off with great force.
Be careful of the safety using
cloth and so on.
Note:
If undue force is applied during
removal, the pawls inside will
become damaged, which will
cause operation problems.
After removing them at the same
time, remove carrier unit 2 from
ring gear unit 2.
7.
8.
Remove sun gear unit 2 and 3
while turning them slightly to
the left and right.
4
9.
Remove carrier unit 1.
Remove ring gear unit 2 and
carrier unit 2 at the same time
while turning ring gear unit 2
slightly to the left and right.
Carrier unit 2
Ring gear unit 2
Carrier unit 1
Stop ring
Screwdriver
Carrier unit 2
Ring gear unit 2
Sun gear unit 2 & 3
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