Shimano XT series Technical Service Instructions

General Safety Information

WARNING
• Use neutral detergent to clean the chain. Do not use alkali-based or acid based
detergent such as rust cleaners as it may result in damage and/or failure of the
chain.
• Use the reinforced connecting pin only for connecting the narrow type of chain.
• There are two different types of reinforced connecting pins available. Be sure to
check the table below before selecting which pin to use. If connecting pins other
than reinforced connecting pins are used, or if a reinforced connecting pin or tool
which is not suitable for the type of chain is used, sufficient connection force may
not be obtained, which could cause the chain to break or fall off.
Reinforced
Chain Chain tool
connecting pin
9-speed super narrow
chain such as TL-CN32 / TL-CN27
Silver
CN-7701 / CN-HG93
6.5mm
8- / 7- / 6-speed narrow
chain such as TL-CN32 / TL-CN27
Black
CN-HG50 / CN-HG40
7.1mm
• If it is necessary to adjust the length of the chain Reinforced Connecting Pin
due to a change in the number of sprocket teeth,
make the cut at some other place than the place
where the chain has been joined using a reinforced
connecting pin or an end pin. The chain will be
End Pin
damaged if it is cut at a place where it has been
joined with a reinforced connecting pin or an end pin.
• Check that the tension of the chain is correct and that the chain is not damaged. If
the tension is too weak or the chain is damaged, the chain should be replaced. If
this is not done, the chain may break and cause serious injury.
• 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.
• Obtain and read the service instructions carefully prior to installing the parts. If
adjustments are not carried out correctly, the chain may come off and this may
cause you to fall off the bicycle which could result in serious injury.
• Read these Technical Service Instructions carefully, and keep them in a safe place
for later reference.
Note
• If gear shifting operations do not feel smooth, wash the derailleur and lubricate all
moving parts.
• If the amount of looseness in the links is so great that adjustment is not possible,
you should replace the derailleur.
• You should periodically clean the derailleur and lubricate all moving parts
(mechanism and pulleys).
• If gear shifting adjustment cannot be carried out, check the degree of parallelism at
the rear end of the bicycle. Also check if the cable is lubricated and if the outer
casing is too long or too short.
• If you hear abnormal noise as a result of looseness in a pulley, you should replace
the pulley.
• If the chain keeps coming off the sprockets during use, replace the sprockets and
the chain.
• Use a frame with internal cable routing is strongly discouraged as it has tendencies
to impair the SIS shifting function due to its high cable resistance.
• Always be sure to use the sprocket set bearing the same
group marks. Never use in combination with a sprocket
bearing a different group mark.
• Use an outer casing which still has some length to spare even
when the handlebars are turned all the way to both sides.
Furthermore, check that the shifting lever does not touch the
bicycle frame when the handlebars are turned all the way.
• A special grease is used for the gear shifting cable (SIS-
SP41). Do not use DURA-ACE grease or other types of
grease, otherwise they may cause deterioration in gear shifting performance.
• Grease the inner cable and the inside of the outer casing before use to ensure that
they slide properly.
• For smooth operation, use the specified outer casing and the bottom bracket cable
guide.
• Operation of the levers related to gear shifting should be made only when the front
chainwheel is turning.
• Parts are not guaranteed against natural wear or deterioration resulting from
normal use.
• For maximum performance we highly recommend Shimano lubricants and
maintenance products
• For any questions regarding methods of installation, adjustment, maintenance or
operation, please contact a professional bicycle dealer.

Technical Service Instructions

RD-M771
In order to realize the best performance, we recommend that the following
combination be used.
Series
RAPIDFIRE (Shifting lever)
Outer casing
Rear derailleur
Type
Freehub
Gears
Cassette sprocket
Chain
Bottom bracket guide
Link Pin

Specifications

Rear Derailleur
Model number
Type
Gears
Total capacity
Largest sprocket
Smallest sprocket
Front chainwheel tooth difference
Installation of the rear derailleur
When installing, be careful not to let the B-tension adjustment screw come into contact
with the dropout tab, otherwise deformation may result.
5 mm Allen key
Group marks
Bracket spindle
Tightening torque :
8 - 10 N·m {70 - 86 in. lbs.}
Chain length on bicycles with rear suspension
The length of A will vary depending on the movement of the rear suspension. Because
of this, an excessive load may be placed on the drive system if the chain length is too
short. Set the length of the chain by adding two links to the chain when the rear
suspension is at a position where dimension "A" is longest and the chain is on the
largest sprocket and the largest chainring. If the amount of movement of the rear
suspension is large, the slack in the chain may not be taken up properly when the chain
is on the smallest chainring and smallest sprocket.
A'
A
SI-5W60A-002

SIS Adjustment

1. Top adjustment
Turn the top adjustment screw
Rear derailleur
to adjust so that the guide
pulley is in line with the outer
line of the smallest sprocket
when looking from the rear.
XT
SL-M770
SIS-SP41
RD-M771
Connect the cable to the rear
SGS / GS
derailleur and, after taking up
FH-M770 / FH-M775 the initial slack in the cable,
re-secure to the rear
9
derailleur as shown in the
CS-M770
illustration.
CN-HG93
SM-SP17 / SM-BT17
Pull
RD-M771
2. Low adjustment
SGS GS
Turn the low adjustment screw so that the guide pulley moves to
9 9 a position directly in line with
the largest sprocket.
45T 33T
34T 34T
11T 11T
22T 22T
3. How to use the B-tension adjustment screw
Mount the chain on the smallest chainring and the largest
sprocket, and turn the crank
B-tension
arm backward. Then turn
adjustment screw
the B-tension adjustment
screw to adjust the guide
pulley as close to the
sprocket as possible but not
so close that it touches.
Next, set the chain to the
smallest sprocket and
Dropout tab
repeat the above to make
sure that the pulley does
not touch the sprocket.
Cutting the outer casing
After cutting the outer casing, make the end round so that the
inside of the hole has a uniform diameter.
Attach the same outer
end cap to the cut end
of the outer casing.
The sealed cap with
tongue and the rubber
Chain
Largest Largest
shield should be
sprocket chainring
installed to the outer
casing stopper of the
frame.
Add 2 links (with the chain on both the largest
sprocket and the largest chainring)
* If the rear derailleur moves to a large degree, such as in
bicycles with rear suspension, it is recommended that you
replace the cap with the
accessory aluminum cap.
Outer line of
The end of the outer casing
smallest sprocket
which has the aluminum cap
should be at the derailleur side.
Top adjustment
screw
4. SIS Adjustment
Operate the shifting lever several times to move the chain to the
Guide pulley
2nd sprocket. Then, while pressing the lever just enough to take
up the play in the lever, turn the crank arm.
When shifting to
3rd
Note: Be sure that the cable is
securely in the groove.
Adjustment bolt
Groove
Tightening torque :
5 - 7 N·m {44 - 60 in. lbs.}
Tighten the outer casing
adjustment barrel until the
chain returns to the 2nd
sprocket. (clockwise)
Best setting
The best setting is when the shifting lever is
Largest
operated just enough to take up the play and the
sprocket
chain touches the 3rd sprocket and makes noise.
Low adjustment
screw
* Return the lever to its original position (the position where
the lever is at the 2nd sprocket setting and it has been
Guide pulley released) and then turn the crank arm clockwise. If the
chain is touching the 3rd sprocket and making noise, turn the outer
casing adjustment barrel clockwise slightly to tighten it until the noise
stops and the chain runs smoothly.
Operate lever to change gears, and check that no noise occurs
in any of the gear positions.
Largest sprocket Smallest sprocket
For the best SIS performance, periodically lubricate all
power-transmission parts.
B-tension
adjustment screw
This service instruction explains how to use and maintain the
Shimano bicycle parts which have been used on your new bicycle.
For any questions regarding your bicycle or other matters which
Outer end cap
are not related to Shimano parts, please contact the place of
purchase or the bicycle manufacturer.
Be careful not to bend
Rubber shield
Sealed cap with tongue
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Rubber shield
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
Please note: specifications are subject to change for improvement without notice. (English)
© May 2008 by Shimano Inc. XBC SZK Printed in Japan.
Derailleur side
Aluminum cap
When no sound
at all is heard
Adjustment bolt
Loosen the outer casing
adjustment barrel until the
chain touches the 3rd sprocket
and makes noise. (counter
clockwise)