Shimano FD-7803 Front Derailleur Service Instructions

Shimano FD-7803 Front Derailleur Service Instructions
General Safety Information
In order to realize the best performance, we recommend that the following
combination be used.
Series
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.
• 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.
• 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.
Be sure to follow the sequence described below.
DURA-ACE
Shifting lever
1. Low adjustment
ST-7803
Outer casing
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.
SP41
Gears
30
Front derailleur
FD-7803
Front chainwheel
FC-7803
Rear derailleur
Chain position
Largest
sprocket
RD-7800-GS
Freehub
FH-7800
Cassette sprocket
CS-7800
Smallest
chainring
Pro-Set alignment block
CN-7801
Bottom bracket cable guide
SM-SP17
Type
Band type / Brazed on type
Front chainwheel tooth difference
22 teeth or less
Min. difference between top and
intermediate
13T
Chainstay
angle
Chain guide
inner plate
B
Chain
Chainstay angle (C)
63° - 66°
5. Trimming mechanism adjustment and checking
45mm
Tightening torque:
5 - 7 N·m
{44 - 60 in. lbs.}
Top adjustment
screw
Chain position
From large chainring
to small chainring
Lever b
Smallest
sprocket
Lever a
From small chainring
to large chainring
Lever a
After taking up the initial slack in the cable, re-secure
to the front derailleur as shown in the illustration.
3. Top adjustment
Adjust and then install the front derailleur as shown in the illustration.
Do not remove the Pro-Set alignment block at this time.
Set so that the clearance between the chain guide
outer plate and the chain is 0 - 0.5 mm.
Please note: specifications are subject to change for improvement without notice. (English)
© Mar. 2007 by Shimano Inc. XBC SZK Printed in Japan.
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).
Loosen the top adjustment screw
counterclockwise (about 1/8 turn).
1mm
If there is interference between the chain
and the front derailleur outer plate at the
largest chainring
3mm
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).
Chain position
Smallest
sprocket
-X
Largest
chainring
-D
52
Pro-Set gauge
Front derailleur
Chain
6. Troubleshooting chart
Installation of the front derailleur
SI-5JC0A-001
Largest
chainring
Chain guide
outer plate
Pull
SG
3-77 Oimatsu-cho, Sakai-ku, Sakai-shi, Osaka 590-8577, Japan
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 1/8 th
of a turn. Then, after returning the
chain to its original position, adjust
and check the trimming mechanism.
Lever b
Gear teeth should
come within this
range
Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
Chain
S (ø28.6mm),
M (ø31.8mm), L (ø34.9mm)
Pro-Set alignment block
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003
Chain guide
inner plate
A
Outer casing adjustment barrel
Front derailleur
installation band diameter
Front shifting (ST-7803)
These service instructions are
printed on recycled paper.
Intermediate
chainring
Low adjustment
screw
Specifications
While pulling the inner cable, tighten the wire fixing
bolt with a 5 mm allen key to secure the cable.
Technical Service Instructions
Note: There are 2 derailleur positions for the intermediate chainring. When
making the cable adjustment, make sure that the derailleur is in the
inner side (toward small chainring) of the two positions. Locate the
derailleur to this position by shifting from the largest to the
intermediate chainring (recommended) or by shifting from the small to
the intermediate chainring, then gently press lever (b) until a small
click is felt (to position the derailleur to the inner side of the
intermediate chainring).
Chain position
Front
chainrings
• 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.
When making the cable adjustment, place the chain on the largest
sprocket for the rear and the middle chainring for the front.
Largest
sprocket
2. Connection and securing of cable
Rear
sprockets
4. Cable adjustment using the intermediate 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.
Chain
Chain line
FD-7803
SIS adjustment
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.}
In the case of carbon frames, it may be necessary to lower
the tightening torque in order to prevent damage to the frame.
Please consult the bicycle or frame manufacturer regarding
the appropriate level of tightening torque for carbon frames.
Top adjustment
screw
Chainwheel
(largest chainring)
Chain guide
Chain guide
outer plate
Chain
Be sure to read these service instructions in conjunction with the service
instructions for the ST-7803 before use.
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