After removing the hub axle, remove the freewheel body
fixing bolt (inside the freewheel body), and then replace the
freewheel body.
Note:
Be sure to apply grease to the the thread of the
freewheel body fixing bolt, otherwise looseness or
sticking may occur.
Do not attempt to disassemble the
freewheel body, because it may
result in a malfunction.
The unit can be disassembled as shown
in the illustration.
Apply grease to the various parts at
periodic intervals.
<Assembly>
Use the special tool (TL-HS22/HS20 /17mm)
for installing the hub axle and a 5 mm Allen
key to tighten the lock nut so as to double-lock
the mechanism as shown in the illustration.
<FH-M775 / FH-M770>
<HB-M775 / HB-M770>
<HB-M775>
<HB-M770>
General Safety Information
WARNING
• 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.
• Obtain and read the service instructions carefully prior to installing the parts. Loose,
worn, or damaged parts may cause injury to the rider.
We strongly recommend only using genuine Shimano replacement parts.
• Read these Technical Service Instructions carefully, and keep them in a safe place for
later reference.
Note
• Use the CS-M770 in combination with 9-speed chains (CN-7701 / HG93 / HG73 / HG53).
• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.
• Do not apply any oil 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.
Technical Service Instructions
SI-3CZ0A-002
FH-M775 / FH-M770
HB-M775 / HB-M770
Freehub / Front hub
Specifications
Model No.
Gears
No. of spoke holes
Overlock nut dimensions
Applicable brakes
Freehub
FH-M775
FH-M770
9
32 / 36
135 mm
Freehub / Front hub
Disc brake
Rim brakes
Front hub
HB-M775
HB-M770
––
32 / 36
100 mm
Disc brake
Rim brakes
Model number
CS-M770
Group name
a
Q
as
Gears
9
9
Tooth combination
11, 12, 14, 16, 18, 21, 24, 28, 32T
11, 13, 15, 17, 20, 23, 26, 30, 34T
Cassette sprocket tooth combination
32T
ba
ba
2
8
T
ba
2
4
T
ba
2
1
T
ap
ba
1
8
T
11
T
a
Q
a
r
b
a
12
T
a
Q
a
r
ba
9
S
C
S
-
6
J
P
A
A
N
M
9
0
H
P
Y
E
ERG LID
11T
ap
a
Q
b
a
a
r
1
6
T
a
p
a
Q
a
r
b
a
1
4
T
a
p
a
s
3
4
T
a
p
a
s
3
0
T
a
p
a
s
2
6
T
a
p
a
s
2
3
T
a
s
2
0
T
as
1
7
T
a
s
a
u
1
1
T
a
s
a
u
13T
a
s
a
u
15
T
C
S
-
6
J
P
A
A
N
M
9
0
H
P
Y
E
ERG LID
11T
CS-M770 (a
Q
)
CS-M770 (as)
Sprocket spacer
5 mm Allen key
Lock ring
Hub axle
Installation of the HG sprockets
Maintenance
Check that the spokes have been laced as shown in the
illustration.
A radial assembly cannot be used.
<FH-M775 / HB-M775>
Wheel spoke lacing
For each sprocket, the surface that
has the group mark should face
outward and be positioned so that
the wide parts of the gear
projections on each sprocket and
the A part (where the groove width
is wide) of the freewheel body are
aligned.
The groove is
wide at one
place only.
ac-14T
A
Wide part
For installation of the HG sprockets, use the special
tool (TL-LR15) to tighten the lock ring.
Tightening torque:
30 - 50 N·m {261 - 434 in. lbs.}
Installation of the rotor
Tightening torque:
40 N·m {350 in. lbs.}
Rotor fixing
lock ring
TL-LR15
Please note: specifications are subject to change for improvement without notice. (English)
© Apr. 2007 by Shimano Inc. XBC SZK Printed in Malaysia.
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
Lock ring
Tool
(TL-SR21)
Disassembly
TL-LR15
To replace the HG
sprockets, use the
special tool (TL-LR15)
and TL-SR21 to remove
the lock ring.
Replacement of the freewheel body
First, pull out the hub axle by following the procedure shown in the illustration.
The double-lock section at the freewheel side cannot be disassembled.
(1)
(2)
(3)
Note:
• When removing and installing the seal, do it very
carefully so that the seal does not become bent.
When reinstalling the seal, make sure that it is
facing the right way, and insert it as far as it will go.
• Do not disassemble the dust-proof cover which is
crimped onto the cone.
• The rotor fixing serrations may become damaged if
the disc brake rotor has not been installed to the
FH-M775, so install the accessory rotor mount
cover.
Note:
• The HB-M775 cannot be disassembled from the left side of
the hub unit (the rotor fixing serration side).
• When removing and installing the seal, do it very carefully so
that the seal does not become bent.
When reinstalling the seal, make sure that it is facing the right
way, and insert it as far as it will go.
• The rotor fixing serrations may become damaged if the disc
brake rotor has not been installed to the HB-M775, so install
the accessory rotor mount cover.
17 mm spanner
Cone with dust cover
(Cannot be disassembled)
Seal
Rotor fixing serrations
(FH-M775)
Lip is on the outside
Freewheel body
fixing bolt
Freewheel body
Freewheel body washer
DURA-ACE grease
(Y-04110000)
Do not disassemble
the seal.
Applying grease
Tightening torque:
45 - 50 N·m {392 - 434 in. lbs.}
Tightening torque:
15 - 17 N·m {132 - 146 in. lbs.}
Rotating direction of wheel
Front left
Rear left Rear right
Front right
5 mm Allen key
14 mm Allen key
TL-HS22/HS20
Left side Tightening torque:
15 - 20 N·m {132 - 172 in. lbs.}
Hub axle
Rotor mount cover
Seal
Seal
Seal
Seal
Lock ring spacer
Lock ring
Lock ring spacer
Disassembly
Tighten
