Shimano FC-6600, FC-6601-G, FC-6603, FC-6604-G, SM-FC6600 Service Instructions

With the marked surface of the larger
chainring facing out, set the larger chainring
so that the chain drop prevention pin is lined
up with the crank arm position.

Chain drop prevention pin

Technical Service Instructions SI-1G30E-001

Front chainwheel

FC-6600
FC-6601-G
FC-6603
FC-6604-G

Specifications

Installation of the chainrings

130 mm

52 - 39T, 53 - 39T

CN-6600

43.5 mm

B.C. 9/16" x 20T.P.I. (English thread)

165, 170, 172.5, 175mmCrank arm length

Pedal threads

Applicable chain

Chain line

Chainwheel tooth combination

Bolt circle diameter

FC-6600 / FC-6601-G

130 mm / 74 mm

52 - 39 - 30T

45 mm

FC-6603 / FC-6604-GModel number

Smooth shifting will not be possible if the chainrings are incorrectly
installed, so be sure to install the chainrings in the correct positions.

With the marked surface of the smaller
chainring facing away from the crank arm,
set the chainring so that the o mark is lined
up with the crank arm
position.

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Crank arm

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Crank arm

o mark

68 mm (1.37 X 24 T.P.I.)
70 mm (M36 X 24 T.P.I.)

Bottom bracket shell width
(Thread dimensions)

Outer side

Inner side

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Mark

For the FC-6603/6604-G,
set so that the tooth
number marking on the
largest chainring is facing
outward and the markings
on the intermediate and
smallest chainrings are
facing inward, and also so
that the projections are
aligned with the crank arm.

General Safety Information

WARNING

Installation of the front chainwheel

Follow the procedure in the figure.

1, 2 Use the special tool TL-FC32 to install the right

adapter (counterclockwise thread) and the left
adapter (clockwise thread).
Tightening torque: 35 - 50 N·m {305 - 435 in. lbs.}

3 Insert the right crank unit.

4 Set section A of the left crank into the axle of the

right crank unit where the groove is wide.
(Insert a spacer when installing the FC-6603 / 6604­G left crank unit.)

5 Use the TL-FC16 to tighten the cap.

Tightening torque: 0.7 - 1.5 N·m {6 - 13 in. lbs.}

6 Push in the stopper plate and check that the plate pin

is securely in place, and then tighten the bolt of the
left crank arm.

Note : Each of the bolts should be evenly and

equally tightened to 12 - 15 N·m {106 - 132
in. lbs.}.

Note :

Set the stopper plate in the right
direction as shown in illustration.

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(A)

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Wide groove area

Bottom bracket shell

TL-FC16

TL-FC32

6

For the FC-6603 /
6604-G, insert a
spacer.

Stopper plate

Plate pin

Push up

clockwise for
70 mm [M36] bottom
brackets

• Be careful not to let the cuffs of your clothes get caught in the chain while riding,
otherwise you may fall off the bicycle.

• 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 you may fall off the bicycle.

• The two left crank arm mounting bolts should be tightened alternately in stages rather
than each bolt being fully tightened all at once. Use a torque wrench to check that the
final tightening torques are within the range of 12 - 15 N·m.
Furthermore, after riding approximately 100 km (60 miles), use a torque wrench to re­check the tightening torques. It is also important to periodically check the tightening
torques. If the tightening torques are too weak or if the mounting bolts are not tightened
alternately in stages, the left crank arm may come off and the bicycle may fall over.

• Check that there are no cracks in the crank arms before riding the bicycle. If there are
any cracks, the crank arm may break and you may fall off the bicycle.

• 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.

• 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

• The marks on the left and right crank arms for the FC-6600 and FC-6603 will
be either FC-6600-A or FC-6603-A marks, or FC-6600 or FC-6603 marks.
Make sure that the marks on the left and right crank arms match each other.

• Make sure that the chainring combination matches the front chainwheel tooth
configuration in the Product specifications table. If other combinations are used, the
distance between the chainrings will be incorrect and the chain might slip off and get
caught in between them.

• When the chain is in the position shown in the
illustration, the chain may contact the front chainrings
or front derailleur and generate noise. If the noise is a
problem, shift the chain onto the next-larger rear
sprocket or the one after.

• If the bottom bracket shell is not parallel, gear shifting
performance will drop.

• Before riding the bicycle, check that there is no play or looseness in the connection. Also,
be sure to retighten the crank arm fixing bolt at periodic intervals. (BB-FC, FC-PD)

• If you feel any looseness in the bearings, the bottom bracket should be replaced.

• In addition, if pedaling performance does not feel normal, check this once more.

• Do not wash the bottom bracket with high-pressure jets of water.

• Apply grease to the left and right adapters before installing them.

• To ensure the best performance, be sure to use only the specified type of chain. The wide
type of chain cannot be used.

• If the chain keeps coming off the chainrings during use, replace the chainrings and the
chain.

• You should periodically wash the chainrings in a neutral detergent and then lubricate
them again. In addition, cleaning the chain with neutral detergent and lubricating it can be
an effective way of extending the useful life of the chainrings 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.

• For any questions regarding methods of installation, adjustment, maintenance or
operation, please contact a professional bicycle dealer.

Front
chainrings

Rear
sprockets

These service instructions are printed on recycled paper. Please note: specifications are subject to change for improvement without notice.(English) © Feb. 2007 by Shimano Inc. XBC SZK Printed in Japan.

One Holland, Irvine, California 92618, U.S.A. Phone: [phone] Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: [phone] Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

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