Shimano FC-7800 Technisches & Service-Handbuch

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Technical Service Instructions

FC-7800

General Safety Information

WARNING

• 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.

• 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.

• Read these Technical Service Instructions carefully, and keep them in

a safe place for later reference.

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.

• Check that there is no looseness in any

joints or connections before riding the

bicycle. (BB-FC, FC-PD)

• If you feel any looseness in the bottom bracket axle, 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 bottom bracket before installing it.

• 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.

SI-1F30D

Front chainwheel

Front

chainrings

Rear

sprockets