FD-7703

FD-7703
Technical Service Instructions SI-5H20C
FD-7703
Front derailleur
General Safety Information
WARNING
• 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.
• Be careful not to let the cuffs of your clothes get caught in
the chain while riding, otherwise you may fall off the
bicycle.
• Read these Technical Service Instructions carefully, and
keep them in a safe place for later reference.
Note
• If gear shifting operations cannot be carried out smoothly,
clean 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 generate noise.
If the noise is a problem, shift the chain onto the nextlarger rear sprocket or the one after.
Front
chainrings
Rear
sprockets
• For smooth operation, use the specified outer casing and
the bottom bracket cable guide.
• Grease the inner cable and the inside of the outer casing
before use to ensure that they slide properly.
• 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.
• For the chain, be sure to use only the Shimano narrow
type chain. The wide type chain cannot be used.
• 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.
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In order to realize the best performance, we recommend that the following
combination be used.
Series
DURA-ACE
Shifting lever
ST-7703 (L)
Outer casing
SP40
Gears
27
Front derailleur
FD-7703
Front chainwheel
FC-7703
Bottom bracket
BB-7703
Rear derailleur
RD-7700-GS
Freehub
FH-7700
Cassette sprocket
CS-7700
Chain
CN-HG93 / CN-7701
Bottom bracket cable guide
SM-SP17
Specifications
Type
Stroke
Band type / Brazed on type
Front chainwheel tooth difference
23 teeth or less
Min. difference between top and
intermediate
14T
Front derailleur
installation band diameter
A
S (28.0 - 28.6mm),
M (ø31.8), L (ø34.9)
Chainstay angle (C)
A'
Chainstay
angle
63° - 66°
Chain line
45mm
Front shifting (ST-7703)
Lever b
From large chainring
to small chainring
Lever b
Lever a
From small chainring
to large chainring
Lever a
Installation of the front derailleur
Adjust and then install the front derailleur as shown in the illustration.
Do not remove the Pro-Set alignment block at this time.
Pro-Set alignment block
Gear teeth should
come within this
range
SG
A-52
Pro-Set gauge
1mm
3mm
The level section of the chain guide outer plate should be
directly above and parallel to the largest chainring.
Secure using a 5mm Allen key.
Tightening torque:
5 - 7 N·m {44 - 60 in. lbs.}
Chainwheel
(largest chainring)
Chain guide
SIS adjustment
Be sure to follow the sequence described below.
1. Low adjustment
First remove the Pro-Set alignment block. Next, set so
that the clearance between the chain guide inner plate
and the chain is 0 - 0.5mm.
Chain position
Largest
sprocket
Smallest
chainring
4. Cable adjustment using the intermediate chainring
When making the cable adjustment, place the chain on the largest
sprocket for the rear and the middle chainring for the front.
Note: There are 2 derailleur positions for the middle chain ring. When
making the cable adjustment, make sure that the derailleur is in the
inner side (toward small chain ring) of the two positions. Locate the
derailleur to this position by shifting from the largest chainring to the
middle chainring or by shifting from the small chainring to middle chain
ring, then gently press lever (b) until small click is felt (to position the
derailleur to inner side of the middle chainring).
Adjust the cable tension by using the outer adjustment barrel so that
the clearance between the chain guide inner plate and the chain is 0 0.5 mm.
Pro-Set alignment block
Chain position
Largest
sprocket
Intermediate
chainring
B A
Low
adjustment
screw
A
B
B
B
Chain guide
inner plate
A
Outer casing adjustment bolt
Chain
A
Chain guide
inner plate
Chain
5. Trimming mechanism adjustment and checking
2. Connection and securing of cable
While pulling the inner cable, tighten the wirw fixing
bolt with a 5 mm allen key to secure the cable.
Tightening torque:
5 - 7 N·m
{44 - 60 in. lbs.}
While turning the crank arm, gently operate lever (b) and check that
the front derailleur moves slightly toward the smallest chainring. If the
front derailleur moves by a large amount and the chain is set onto the
smallest chainring at this time, loosen the top adjustment bolt by 1/8th
of a turn. Then, after returning the
chain to its original position, adjust
and check the trimming mechanism.
Top adjustment
screw
Chain position
Smallest
sprocket
Largest
chainring
Chain guide
outer plate
Pull
After taking up the initial slack in the cable, re-secure
to the front derailleur as shown in the illustration.
Chain
6. Troubleshooting chart
3. Top adjustment
Set so that the clearance between the chain guide
outer plate and the chain is 0 - 0.5 mm.
Chain position
Smallest
sprocket
Largest
chainring
B A
Top
adjustment
screw
B
A
Chain guide
inner plate
Chain
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 side
Tighten the top adjustment screw
clockwise (about 1/4 turn).
If shifting is difficult from the intermediate
chainring to the largest chainring
Loosen the top adjustment screw
counterclockwise (about 1/8 turn).
If shifting is difficult from the intermediate
chainring to the smallest chainring
Loosen the low adjustment screw
counterclockwise (about 1/4 turn).
If there is interference between the chain
and the front derailleur inner plate at the
largest chainring
Tighten the top adjustment screw
clockwise (about 1/8 turn).
If there is interference between the chain
and the front derailleur outer plate at the
largest chainring
Loosen the top adjustment screw
counterclockwise (about 1/8 turn).
If the intermediate chainring is skipped
when shifting from the largest chainring
Loosen the outer casing adjustment
barrel counterclockwise (1 or 2 turns).
If there is interference between the chain
and front derailleur inner plate when the
rear sprocket is shifted to the largest
sprocket when the chainwheel is at the
intermediate chainring position.
Tighten the outer casing adjustment
barrel clockwise (1 or 2 turns).
If the chain falls to the bottom bracket
side.
Tighten the low adjustment screw
clockwise (about 1/2 turn).
Be sure to read these service instructions in conjunction with the service
instructions for the ST-7703 before use.
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