73
Technical Manual Gear Hub Systems 2010 · GEN.0000000002002 · Rev. A
SRAM
®
S7
MAINTENANCE
REASSEMBLY HUB
see Fig. 1
Lubrication see “
MAINTENANCE /
LUBRICATION
“.
• Insert into the axle (on the side with the
internal thread):
Short compression spring (21), thrust
block (20) – it is the same both sides, guide
rod (19) – it is the same both sides, long
compression spring (18).
• Compress spring and fit grub screw (17).
• Clamp axle, end with groove for
Clickbox facing upwards.
• Fit plastic profile washer (22) with its
large diameter upwards.
• Fit thrust washer (23) and retaining
washer (24).
• Locate cover (25), compression spring (26)
with 7 turns and cover (27, insides to the
spring).
• Compress spring and position thrust
block (28) – it is the same both sides –
centrally in the axle.
• Clamp other axle end (groove is facing
downwards).
• Fit large sun gear (15), with deflector
bevels upwards.
• Position medium sun gear (14), with
deflector bevels upwards.
• Fit small sun gear (13) – with recesses in
front, thrust block engages in the slots.
• Position smallest compression spring (12).
• Fit 1 mm thick washer (11).
• Fit planetary gear carrier (10):
Place the mounting aid(Fig. 2) on the
planetary gear carrier such that the
markings (X) on the 3 small planet gears
and the mounting aid match up.
• Turn planetary gear carrier and at the
same time push it downwards over the
sun gears.
• Fit thrust washer (9) and retaining
washer (8) in the undercut.
Now remove the mounting aid.
Advice:
If the gears are not accurately assembled
the hub may feel tight in use. This may
lead to gear wheel damage during travel.
• Clamp other axle end (groove for
Clickbox facing upwards).
• Fit coupling gear (29) with carrier plate
downwards
• Push ring gear (30) over the coupling
gear.
• Locate large spring (31).
• Fit largest ball retainer (34) with balls
underneath.
• Fit cover (32, inside to the spring).
• Assemble the compression spring (33)
with 12 turns.
• Position driver (35) – push it down – and
screw on fixed cone (36) to the stop,
tightening torque 20 Nm (177 in.lbs.).
• Clamp other axle end (groove for
Clickbox is facing downwards).
• Assemble hub shell (6) with a slight
counter-clockwise movement.
In case the hub shell jams, position the
plastic ring (Fig. 3) correctly. The plastic
ring is only fitted to some hub versions.
• Screw brake cone (7) clockwise onto
the planetary gear carrier (10) until it
stops.
• Insert 3 brake segments (5).
• Turn in friction spring (3) counterclock-
wise into the lever cone (2) (inlying
winding of the spring has to lie against
the lever cone) (Fig. 4).
• Insert ball retainer (4) (balls are facing
upwards) into lever cone (2): the 3 re-
cesses have to engage into the retaining
lugs of the lever cone. Slightly turn ball
retainer to prevent it from falling off.
• Fit lever cone onto hub shell: the
retaining lugs of the lever cone have to
engage into the openings between the
brake segments. Make sure that lever
cone engages while turning it back and
forth slightly.
• Screw on locknuts (1), adjust bearing
so that there is no play and lock nuts
together with 15 – 20 Nm (133 – 177in.lbs.).
Caution:
Check that all the brake system
components are functioning properly!
Advice:
Dismantling and reassembly of hub ver-
sion without brake should be carried out
in the same way.
Differences: Instead of brake segments /
cone a click-and-pawl carrier is installed
on the planetary gear carrier.
4
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