Shimano FC-CX70 Technical Service Instructions - Page 2

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Shimano FC-CX70 Technical Service Instructions

SI-1MR0A-001-00

General Safety Information

WARNING

"Maintenance interval depends on the usage and riding circumstances. Clean

regularly the chain with an appropriate chaincleaner. Never use alkali based or

acid based solvents such as rust cleaners. If those solvent be used chain

might break and cause serious injury."

• 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 - 14 N·m. Furthermore, after riding approximately 100 km (60 miles), use a

torque wrench to re-check 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, and serious injury

may occur as a result.

• 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.

• If the inner cover is not installed correctly, the axle may rust and become damaged, and the bicycle

may fall over and serious injury may occur as a result.

• 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.

CAUTION

• If the chain is on the smallest or intermediate chainring, there is the danger of injury from the tips of

the teeth on the largest chainring.

Note

• 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 arms and pedals at periodic intervals.

• If a squeaking noise is heard coming from the bottom bracket axle and the left

crank arm connector, apply grease to the connector and then tighten it to the specified torque.

• Use a neutral detergent to clean the crank arm and the bottom bracket. Using alkaline or acidic

detergents may cause discoloration.

• 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.

• When installing the left and right adapters, be sure to install the inner cover too, otherwise the

waterproofing performance will drop.

• 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.

• The cuffs of your clothing may get dirty from the chain while riding.

• When installing the pedals, apply a small amount of grease to the threads to prevent the pedals from

sticking. Use a torque wrench to securely tighten the pedals. Tightening torque: 35 - 55 N·m {305 - 479

in. lbs.}. The right-hand crank arm has a right-hand thread, and the left-hand crank arm has a left-hand

thread.

• 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

FC-CX70 / FC-CX50

Front chainwheel

Specifications

Model number

Chainwheel tooth combination

Bolt circle diameter

Pedal threads

Applicable chain

Chain line

Bottom bracket shell width

(Thread dimensions)

Bottom bracket

Installation of the front chainwheel

Follow the procedure in the figure.

1. 2.

Use the TL-FC32/33/36 special tool to install the right

Front

adapter (counterclockwise thread), the inner cover and

chainrings

the left adapter (clockwise thread).

Tightening torque: 35 - 50 N·m {305 - 435 in. lbs.}

Rear

sprockets

Insert the right crank unit.

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

crank unit where the groove is wide.

Use the TL-FC16/18 to tighten the cap.

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

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. (5 mm Allen key)

Note :

Each of the bolts should be evenly and equally

tightened to 12 - 14 N·m {106 - 122 in. lbs.}.

One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003

* Service Instructions in further languages are available at : http://techdocs.shimano.com

Please note: specifications are subject to change for improvement without notice. (English) © Feb. 2011 by Shimano Inc. XBC IZM Printed in Malaysia.

SI-1MR0A-001

Installation of the chainrings

• 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 larger chainring facing

out, set the larger chainring

so that the chain drop

prevention pin is lined up

with the crank arm position.

FC-CX70

FC-CX50

46 G – 36 G

110 mm

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

CN-7901 / 6701

CN-5701 / 4601

With the marked surface of the smaller

chainring facing away from the crank arm, set

43.5 mm

the chainring so that the projection on the

68 mm (1.37 x 24 T.P.I.)

inside is aligned with the crank arm.

70 mm (M36 x 24 T.P.I.)

SM-BB6700

SM-BB4600

Tightening torque:

< FC-CX70 >

12 - 16 N·m {106 - 139 in. lbs.}

< FC-CX50 >

12 - 14 N·m {106 - 122 in. lbs.}

(A)

TL-FC16

Plate pin

Stopper plate

Push up

Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222

3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan

Outer side

Crank arm

Chain drop prevention pin

Inner side

Mark

Projection

Crank arm

• Right adapter

clockwise thread for 70 mm

TL-FC32

[M36] bottom brackets

Wide groove area

Inner cover

Bottom bracket shell

Note :

Set the stopper plate in the right

direction as shown in illustration.