Shimano Nexus3 178 Manual
Shimano Nexus3 178 Manual
Shimano Nexus3 178 Manual
SG-3C41
SERVICE MANUAL vol.1
Disassembly of the Inter-3 hub
SG-3C41
Note:
Unit parts should never be
disassembled. If they are,
problems may result.
When replacing parts,
replace the whole internal
assembly or unit part.
Vice
Note:
Do not damage the threads of
the hub axle.
2. Turn the brake arm unit Remove the left hand lock nut
upside down and hold from the hub axle, and then
the two bevelled surfaces of remove the stop nut.
the hub axle on the sprocket
side in a vice.
TL-7S20
2
3. Remove the brake arm unit.
Hub shell
Internal assembly
[SG-3C41-DX]
Y-35U 98010 (Axle Length 168 mm)
Y-33R 98020 (Axle Length 175 mm)
3
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.
Screwdriver
7. Remove the carrier unit and After removing them at the same
the ring gear unit at the same time, remove the carrier unit from
time while turning the ring the ring gear unit.
gear unit slightly to the left
and right.
Screwdriver
ball retainer K
9. Turn the axle unit with driver Remove the right hand lock nut
unit upside down and hold and the right hand cone with
the two bevelled surfaces of dust seal from the hub axle.
the axle in a vice.
4
10. Remove ball retainer J from
the driver unit.
Ball retainer J
Driver unit
Note:
Pawl C
Do not disassemble the axle unit,
Pawl A-1 otherwise it may cause problems
with gear shifting.
5
Assembly of the Inter-3 hub
Axle unit
Gear
Note:
Do not damage the threads of
the hub axle.
Vice
Pawl A-1
GREASE (Y-041 20800)
Axle unit
with driver unit
4. Screw the right hand cone Install the right hand lock nut
with dust seal onto the hub and the right hand cone with
axle as far as it will go, and dust seal onto the hub axle.
then secure it by tightening
the right hand lock nut.
Axle unit
with driver unit
6
5. Turn the axle unit with driver Note:
unit upside down and hold Be careful of
the two bevelled surfaces of the setting direction.
the axle on the sprocket side Apply a liberal coating of internal
in a vice. hub grease.
Install ball retainer K while Be careful not to bend ball
pressing in pawl A-1 and pawl retainer K.
C on the driver unit with
a screwdriver.
Pawl A-1 Screwdriver
Pawl C
Ball retainer K
GREASE (Y-041 20800)
Clutch
Driver unit
Pawl A-1
Pawl C
Screwdriver
7
7. Engage the teeth of the Check:
planetary gear of the carrier Check that the stop ring groove
unit with the teeth of the ring of the hub axle is visible from
gear unit while turning the the edge of the carrier unit after
carrier unit slightly to the left the carrier unit has been
and right and pushing it onto installed.
the ring gear unit.
Teeth of carrier unit
Note: planetary gear
Apply a liberal coating of
Teeth of ring gear unit
internal hub grease to the
planetary gear (in 4 places)
inside the carrier unit. GREASE (Y-041 20800)
Hub shell
Internal assembly
8
10. Place ball retainer L onto the Note:
brake arm unit. Be careful of
the setting direction.
Apply a liberal coating of internal
hub grease.
Ball retainer L
Projection of
brake arm unit
GREASE (Y-041 20800)
Hub shell
9
13. Screw on the stop nut to
adjust so that the hub shell TL-7S20
can be turned smoothly
Tightening torque:
without any play. After
12-20 Nm (120-200 kgfcm)
adjusting, secure the stop nut
with the left hand lock nut.
Stop nut
10
Spare parts list
17 31
26
2 3 4 5 6 7 8 9 10 11 28
29 30
11
Spare parts list
17 32
27
2 3 4 5 6 7 8 9 10 11 29
30 31