Shimano FD-M781-D Manual

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SI-5N30A-001-00

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.

• 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

• This front derailleur is for triple front chainwheel use only. It cannot be used with the double front

chainwheel, as the shifting points do not match.

• 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.

• When the chain is in the position shown in the illustration, the

chain may contact the front chainrings or front derailleur and

Front

generate noise. If the noise is a problem, shift the chain onto

chainrings

the next-larger rear sprocket or the one after if the chain is in

the position shown in Figure 1. Shift the chain onto the next-

smaller sprocket or the one after if it is in the position shown in

Rear

Figure 2.

sprockets

• For frames with suspension, the chain stay angle will vary

depending on whether the bicycle is being ridden or not being

ridden. When the bicycle is not being ridden and the chain is positioned on the largest/larger chainring and

on the smallest sprocket, the chain guide outer plate of the front derailleur may touch the chain.

• Shimano does not provide the bottom bracket mount fixing bolts.

• For smooth operation, use the specified outer casing and the bottom bracket cable guide.

• 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.

• Be sure to read the service instructions for the Front Drive System in conjunction with these service

instructions.

Technical Service Instructions

SI-5N30A-001

FD-M780 / FD-M780-E

FD-M781 / FD-M781-D

Specifications

Model number

FD-M780

Normal type

Top route type

Front chainwheel tooth difference

Min. difference between top and intermediate

Front derailleur installation band diameter

S, M, L

Chainstay angle (

)

Applicable chain line

Applicable front chainwheel

For triple chainwheel only (42-32-24T)

Installation of the front derailleur

For bracket type

Install as shown in the illustration.

Tightening torque :

35 - 50 N·m {305 - 435 in. lbs.}

Tightening torque :

5 - 7 N·m {44 - 60 in. lbs.}

Adapter

Note:

When installing the components to carbon frame/handle bar surfaces, verify with the manufacturer of the carbon

frame/parts for their recommendation on tightening torque in order to prevent over tightening that can cause

damage to the carbon material and/or under tightening that can cause lack of fixing strength for the components.

• FD-M780 / M781

Install the front derailleur as shown in the

illustration. At this time, adjust the position of

the front derailleur while installing it so that

there is a clearance of 1 - 3 mm between the

chain guide outer plate and the maximum outer

diameter of the larger chainring.

Chain guide outer plate

Clearance:

1~3mm

Pro-Set gauge

Maximum outer diameter

Fig.1

Fig.2

Set the height of the front derailleur. The flat

section of the chain guide outer plate should

be directly above and parallel to the largest

chainring. Secure using a 5 mm allen key.

Chainwheel (largest chainring)

Chain guide

Tightening torque :

5 - 7 N·m {44 - 60 in. lbs.}

Models without BB plate

• FD-M780-E

Front derailleur

SIS Adjustment

Be sure to follow the sequence described below.

* If the bicycle has rear suspension, first check the recommended segment position according to

X = Available

the owner's manual for the bicycle. Next, use a fixing band or similar to set the rear suspension to

FD-M780-E

FD-M781

FD-M781-D

the recommended stroke for the rear suspension, and then adjust the front derailleur.

1. Low adjustment

First remove the Pro-Set alignment block.

Next, set so that the clearance between the chain guide inner

18T

plate and the chain is 0 - 0.5 mm.

10T

–

S, M, L

–

Pro-Set alignment

66° - 69°

block

50 mm

2. Connecting and securing the inner cable

Switch the mode converter to the 3x (triple mode) position,

Front Derailleur

and then check the lowest position. Operate lever B two

times or more to set the lever to the lowest position.

Front Chainwheel

Remove the inner hole cover, and install the cable.

Bolt

Adapter

Note:

Do not force the mode select switch to turn. If you force it to

turn, it will break.

• FD-M781-D

Pro-Set alignment

block

Tightening torque :

5 - 7 N·m {44 - 60 in. lbs.}

155.5mm*

42T

• FD-M780 / FD-M780-E

159.5mm*

42T

< Normal type >

155.5 mm / 159.5 mm*

(From bottom bracket

center)

* The installation height will vary depending on the

position of the frame washer.

Bottom bracket mount fixing bolt

Note: Shimano does not provide

the bottom bracket mount

fixing bolts.

Bottom bracket

mount

Bracket

• FD-M781

< Normal type >

Example: When using an Allen key

Tightening torque :

5 - 7 N·m {44 - 60 in. lbs.}

FD-M781

FD-M781-D

FD-M780

FD-M780-E

• FD-M781-D

Chain position

< Normal type >

Largest

Smallest

Chain guide

sprocket

chainring

inner plate

Chain

Low adjustment

screw

Mode converter

Lever (B)

Inner cable

Inner hole cover

Mode select switch

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) © Dec. 2010 by Shimano Inc. XBC SZK Printed in Japan.

Install the inner hole cover by turning it

Inner hole cover

as shown in the illustration until it

stops.

Do not turn it any further than this,

otherwise it may damage the thread

on the cover.

Cutting the outer casing

When cutting the outer casing, cut the

opposite end to the end with the marking.

3. Top adjustment

After cutting the outer casing, make the

end round so that the inside of the hole

has a uniform diameter.

Outer end cap

Attach the same outer

end cap to the cut end of

the outer casing.

FD-M780-E (Models without BB plate)

Use an 8 mm spanner or a 4 mm Allen key to tighten the wire

4. Adjustment of the intermediate

fixing bolt.

< Top route type >

8 mm spanner

Note:

Pass the cable through as

shown in the illustration.

Wire fixing bolt

5. Troubleshooting chart

4 mm Allen key

< Top route type >

Note:

Pass the cable through as

shown in the illustration.

5 mm Allen key

Wire fixing bolt

< Top route type >

Note:

Pass the cable through as

shown in the illustration.

5 mm Allen key

Wire fixing bolt

Tightening torque :

6 - 7 N·m {52 - 60 in. lbs.}

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

After taking up the initial slack in the cable, re-secure to the front

derailleur as shown in the illustration.

Normal type

Top route type

Pull

Set so that the clearance

between the chain guide outer

plate and the chain is 0 - 0.5

mm.

Chain position

Top adjustment

FD-M780

screw

Smallest

Largest

FD-M780-E

sprocket

chainring

Chain guide

outer plate

FD-M781

FD-M781-D

Chain

chainring

When carrying out adjustment, set the

chain to the largest sprocket, and at the

front, set the chain to the intermediate

chainring. Adjust using the outer casing

adjustment barrel so that the clearance

between the chain guide inner plate

and the chain is 0 - 0.5 mm.

Chain guide

inner plate

Chain

Chain position

Largest

Intermediate

sprocket

chainring

Outer casing adjustment barrel

After completion of steps 1 - 4, move the shifting lever to check the

shifting. (This also applies if shifting becomes difficult during use.)

If the chain falls to the crank

Tighten the top adjustment screw

side.

clockwise (about 1/4 turn).

If shifting is difficult from the

Loosen the top adjustment screw

intermediate chainring to the

counterclockwise

largest chainring.

(about 1/8 turn).

If shifting is difficult from the

Loosen the low adjustment screw

intermediate chainring to the

counterclockwise

smallest chainring.

(about 1/4 turn).

If the chain does not shift

Turn the outer casing adjustment

smoothly from the intermediate

barrel about 1/4 of a turn

chainring to the largest chainring

counterclockwise.

even though the top adjustment

bolt has been adjusted.

If the chain does not shift

Turn the outer casing adjustment

smoothly from the intermediate

barrel about 1/4 of a turn

chainring to the smallest

clockwise.

chainring even though the low

adjustment bolt has been

adjusted.

If there is interference between

Tighten the top adjustment screw

the chain and the front derailleur

clockwise (about 1/8 turn).

inner plate at the largest

chainring.

If there is interference between

Loosen the top adjustment screw

the chain and the front derailleur

counterclockwise

(about 1/8 turn).

outer plate at the largest

chainring.

If the intermediate chainring is

Loosen the outer casing

skipped when shifting from the

adjustment barrel

largest chainring.

counterclockwise (1 or 2 turns).

If there is interference between

Tighten the outer casing

the chain and front derailleur

adjustment barrel clockwise

inner plate when the rear

(1 or 2 turns).

sprocket is shifted to the largest

sprocket when the chainwheel is

at the intermediate chainring

position.

If the chain falls to the bottom

Tighten the low adjustment screw

clockwise (about 1/2 turn).

bracket side.

If the lever is stiff when shifting

Loosen the top adjustment screw

counterclockwise (about 1/4

from the intermediate chainring

to the largest chainring.

turn).

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