Detailed instructions for use are in the User's Guide.
[. . . ] SI-3D80A-004-00
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. [. . . ] · An 11T and a 12T lock ring are available for use with the CS-7900. Use whichever lock ring matches the sprocket configuration. · 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.
To replace the HG sprockets, use the special tool (TL-LR15/LR10) and TLSR21 to remove the lock ring.
The groove is wide at one place only.
Spacer Sprocket spacers Lock ring
Lock ring
12T - 23T, 12T - 25T, 12T - 27T
When installing the CS-7900 (10gears) freehub, install a spacer in the position shown in the illustration.
TL-LR15/LR10
Tool (TL-SR21)
Disassembly
Spacer
Sprocket spacers
Lock ring
Technical Service Instructions
SI-3D80A-004
Replacement of the freewheel body
%
First, pull out the hub axle by following the procedure shown in the illustration. Disassembly from the freewheel side is not possible.
FH-7900
Specifications
Freehub
Model No. of spoke holes Overlock nut dimensions FH-7900 10 / 9 / 8 24 / 28 / 32 / 36 (Flat spokes : 24 / 28) 130 mm
(1)
5 mm Allen key
(2) B
(3)
Cone
A
Disassembly
Seal
Hub axle
Cassette sprocket
Sprockets marked by
Model No. 11T - 21T 11T - 23T 11T - 25T Sprocket tooth configuration 11T - 27T 11T - 28T 12T - 23T 12T - 25T 12T - 27T
Cone holding tube
are secured.
CS-7900 11T, 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 21T 11T, 12T, 13T, 14T, 15T, 16T, 17T, 19T, 21T, 23T 11T, 12T, 13T, 14T, 15T, 17T, 19T, 21T, 23T, 25T 11T, 12T, 13T, 14T, 15T, 17T, 19T, 21T, 24T, 27T 11T, 12T, 13T, 14T, 15T, 17T, 19T, 21T, 24T, 28T 12T, 13T, 14T, 15T, 16T, 17T, 18T, 19T, 21T, 23T 12T, 13T, 14T, 15T, 16T, 17T, 19T, 21T, 23T, 25T 12T, 13T, 14T, 15T, 16T, 17T, 19T, 21T, 24T, 27T
%
5 mm Allen key
Left side Tightening torque: 15 - 17 N·m {130 - 148 in. lbs. }
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. [. . . ] lbs. }
Freewheel body
Applying grease
DURA-ACE grease (Y-04110000)
Freewheel body washer
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
Disassembly
14 mm Allen key
* Service Instructions in further languages are available at : http://techdocs. shimano. com
Please note: specifications are subject to change for improvement without notice. XBC SZK Printed in Japan.
Do not disassemble the seal.
Freewheel body fixing bolt [. . . ]
