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SI-3TG0A-002-00
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.
<FH-M785 / FH-T780>
Installation of the HG sprockets
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.
Wide part
A
<CS-M771-10>
(bJ) 11 - 34T
(bK) 11 - 36T
(bL) 11 - 32T
<CS-6700>
11 - 28T
Sprocket spacer Sprocket spacer
Lock ring
Lock ring
After removing the hub axle, remove the freewheel body
fi xing 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 fi xing bolt, otherwise looseness or
sticking may occur.
Do not attempt to disassemble
the freewheel body, because it
may result in a malfunction.
Freewheel body
Freewheel body
washer (FH-M785)
Do not disassemble
the seal.
Applying grease
DURA-ACE grease
(Y-04110000)
Freewheel body
fi xing bolt
Note
●
Use the CS-M771-10 in combination with an MTB 10-speed chain.
●
If the wheel becomes stiff and diffi cult 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-3TG0A-002
FH-M785 / HB-M785
FH-T780 / HB-T780
Freehub / Front hub
Specifi cations
Freehub / Front hub
Freehub Front hub
Model No. FH-M785 FH-T780 HB-M785 HB-T780
Gears 10 ––
No. of spoke holes 32 / 36 32 / 36
Overlock nut dimensions 135 mm 100 mm
Applicable brakes Disc brake Rim brake Disc brake Rim brake
Cassette sprocket tooth combination
Model number Group name Gears Tooth combination
bJ 10 11, 13, 15, 17, 19, 21, 23, 26, 30, 34T
CS-M771-10
CS-6700 – 10 11, 12, 13, 14, 15, 17, 19, 21, 24, 28T
* The RD-M780 cannot be used in combination with the CS-6700 (11-28T).
* The RD-T780 cannot be used in combination with the CS-M771-10 (11-36T).
* Service Instructions in further languages are available at: http://techdocs.shimano.com
Please note: Specifi cations are subject to change for improvement without notice. (English)
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
bK 10 11, 13, 15, 17, 19, 21, 24, 28, 32, 36T
bL 10 11, 12, 14, 16, 18, 20, 22, 25, 28, 32T
The groove is wide
at one place only.
Lock ring spacer
For installation of the HG sprockets, use the special tool
(TL-LR15/LR10) to tighten the lock ring.
Tightening torque:
30 - 50 N·m {261 - 435 in. lbs}
To replace the HG sprockets, use the special tool
(TL-LR15/LR10) and TL-SR21 to remove the lock ring.
Spacer
Disassembly
Lock ring spacer
Lock ring
TL-LR15 / LR10
Replacement of the freewheel body
First, pull out the hub axle by following the procedure shown in the illustration. (FH-M785)
The double-lock section at the freewheel side cannot be disassembled.
(1)
Disassembly
5 mm Allen key 17mm spanner
Left side Tightening torque:
15 - 20 N·m {131 - 174 in. lbs.}
(3)
Hub axle
(2)
Rotor fi xing serrations
Seal
Cone with dust cover
(Cannot be disassembled)
Lip is on the outside
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 fi xing serrations may become damaged
if the disc brake rotor has not been installed to the
FH-M785, so install the accessory rotor mount cover.
Tool
(TL-SR21)
14 mm Allen key
<HB-M785>
Maintenance
The unit can be disassembled as
shown in the illustration.
Apply grease to the various parts at
periodic intervals.
Rotor mount cover
<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.
Tightening torque:
15 - 17 N·m {131 - 148 in. lbs.}
<FH-M785 / HB-M785>
Note:
●
The HB-M785 cannot be disassembled from the left side of the
hub unit (the rotor fi xing 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 fi xing serrations may become damaged if the disc
brake rotor has not been installed to the HB-M785, so install the
accessory rotor mount cover.
Seal
Wheel spoke lacing
Check that the spokes have been laced as shown in
the illustration.
A radial assembly cannot be used.
Rotating direction of wheel
Front left Rear left Rear right Front right
Tightening torque:
45 - 50 N·m {392 - 435 in. lbs.}
Seal
Hub axle
TL-HS22/HS20
Installation of the rotor
40 - 50 N·m {348 - 435 in. lbs}
5 mm Allen key
Tighten
Rotor fi xing lock ring
TL-LR15
Tightening torque:
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
© Jan. 2011 by Shimano Inc. AWS Printed in Malaysia.
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
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