Shimano FH-M988 Service Instructions
FH-M988
10
32
142 mm
12 mm
RD-M980 / M985
Freehub
Model No.
Gears
No. of spoke holes
Overlock nut dimensions
Axle diameter
Applicable rear derailleur
General Safety Information
• The FH-M988 freehub is not designed for downhill riding and free riding, so if cracks develop in
the hub mounting axle as a result of the riding conditions, the axle may break and the bicycle
may fall over, and serious injury or death may occur as a result.
Before riding the bicycle, check the hub mounting axle thoroughly to see if it contains any
cracks, and stop using the bicycle immediately if any problems are found.
• The FH-M988/SM-AX75 can only be used in combination with a special frame. If they are used
with any other type of frame, the wheel may come off while the bicycle is being ridden, and
serious injury may occur as a result.
• Always check that the wheels are properly secured before riding the bicycle. If this is not done,
the wheels may fall off the bicycle during riding, and serious injury may occur as a result.
• Be sure to read the Service Instructions for the disc brakes and the SM-AX75 together with
these Service Instructions.
• Obtain and read the service instructions carefully prior to installing the parts. Loose, worn
or damaged parts may cause the bicycle to fall over and serious injury may occur as a result.
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
• If the wheel becomes stiff and difficult to turn, you should lubricate it with grease.
• Do not apply any lubricant 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.
• This product is not warranted against damage resulting from use such as jumping while riding
or if the bicycle falls over, except if such malfunctions result from non conforming materials or
manufacturing methods.
• Parts are not guaranteed against natural wear or deterioration resulting from normal use.
• For maximum performance we highly recommend Shimano lubricants and maintenance
products.
WARNING
Series
Shifting lever
Outer casing
Rear derailleur
Type
Freehub
Freehub axle (rear hub axle)
Front hub
Gears
Cassette sprocket
Chain
Bottom bracket guide
XTR
SL-M980
OT-SP41 (SIS-SP41)
RD-M980 / M985
GS / SS
FH-M988
SM-AX75
HB-M988
10
CS-M980
CN-M980
SM-SP17
In order to realize the best performance, we recommend that the following
combination be used.
Specifications
Wheel spoke lacing
Installation of the rotor
Maintenance
These units can be disassembled as shown in the illustrations. Grease should be applied to each part at periodic
intervals.
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 covers which are crimped onto the right nut and the cone.
• Do not attempt to disassemble the freewheel body, because it may result in a malfunction.
Applying grease
DURA-ACE grease
(Y-04110000)
Seal
(Lip is on the outside)
Right nut
Dust cover
(Cannot be disassembled)
Rotor
installation ring
TL-LR15
Freewheel body
TL-FH15
Disassembly
2
1
Thread typePart name Vertical dropout Tightening torque
1
2
Left hand lock nut (M15)
Left hand cone (M15)
15 - 20 N·m
{130 - 174 in. lbs.}
17 mm spanner
17 mm spanner
Right hand thread
Right hand thread
—
Check that the spokes have been laced as shown in the illustration.
A radial assembly cannot be used.
Use the TL-FH12 assembly tool when assembling the wheel.
Rotating direction
of wheel
Rear left Rear right
Tightening torque:
40 - 50 N·m
{350 - 435 in. lbs.}
Tightening torque:
150 N·m
{1305 in. lbs.}
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
* Service Instructions in further languages are available at : http://techdocs.shimano.com
Please note: specifications are subject to change for improvement without notice.(English) © Jan. 2010 by Shimano Inc. XBC SZK Printed in Japan.
Replacement of the freewheel body
Disassembly Assembly
Assembly
Freewheel body
washer
SI-3DY0A-001-00
Technical Service Instructions SI-3DY0A-001
FH-M988
Freehub
Cone with dust cover
(Cannot be disassembled)
Installation of the sprockets
The groove is wide at one
place only.
(bJ) 11 - 34T
(bk) 11 - 36T
Wide part
A
a
c
-
1
4
T
For installation of the HG sprockets, use the special tool (TL-LR15/
LR10) to tighten the lock ring.
To replace the HG sprockets, use the special tool (TL-LR15/LR10)
and TL-SR21 to remove the lock ring.
Tightening torque:
30 - 50 N·m {261 - 434 in. lbs.}
For each sprocket, the surface that has the group mark should face outward and be positioned so that
the wider part of each sprocket and the A part (where the groove width is wide) of the freewheel body
are aligned.
Lock ring
Lock ring spacer
Sprocket spacer
Disassembly
Lock ring
TL-LR15/LR10
Tool
(TL-SR21)
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