SERVICE INSTRUCTIONS
Before use, read these instructions carefully, and follow them for correct use.
Front Derailleur
FD-M451
EXAGE
ESpecifications
Band Band type..... 228.00 - 328.60mm (1-3/32” —1-1/8”)
diameter
EC-type (End-less clamp type).....231.8mm or ©349mm (1-1/4” or 1-3/8”)
Band type.....34 ~ 54mm (1-11/32" ~ 2-1/8")
Fl ч A’ .
31.8mm (1-1/4").....35 ~ 55mm p= =
Stroke (A— A’) (1-3/8” — 2-5/32”) oT ГП
EC-type
2349mm (1-3/87).....36 - 565mm [] |
(1-13/32” — 2-7/32”) HELL ||
> noo
||
UNEN
E Note
@The following products should be used together for the Shimano Index System
(SIS) function.
e Shifting Lever................. SL-M451
e Front Derailleur .............. FD-M451
e Front Chainwheel ........... FC-M450
eChain er Shimano UG chain (narrow chains cannot be used)
eQuter Cable ................... Shimano SIS-SP outer cable
Shimano SIS-SP sealed cable
@®Because the high cable resistance of a frame with internal
cable guides would impair the SIS function, this type of
frame should not be used.
e The only type of frame that can be used is the type in which the
inner wire lead passes through the lower part of the B.B. shell.
Inner wire lead
Front Derailleur Assembly and Alignment
Clearance
1. ANT 1-3mm
If using Biopace gears, set the front
derailleur while the crank arm is in a
direct line with the seat tube.
The special alignment tool (TL-FD21) is
convenient for checking the installation
of the front derailleur to the frame.
Front
Chainwheel
(Large gear)
Г Front Chainwheel
(Large gear)
+—Chainguide
5mm Allen key
2. The outside surface ® of the chain
guide should be directly above and
parallel to the large gear.
Secure the chain guide with a
5 mm Allen key.
GET
E
Adjust with the lever at the friction position.
SHIMANO AMERICAN CORPORATION
D S Li | m A no One Shimano Dive. Irvine. Calilornia. USA 92719 Tel. (714) 951-5003
Low adjustment bolt
1. Low adjustment
Smallest gear
Smallest gear
Set so that the clearance between
the chain guide outer plate and the
chain is 05—1.0mm.
Chain guide
puter plate
Chain
2. Cable assembly
Pull the inner cable and secure it. After the initial stretch is gone, secure it once
again.
(Tightening torque: 50kgfcm (43 in.lbs.))
3. Top adjustment
Smallest gear Largest gear
Top adjustment boll
| . Chain quide
Set the chain guide outer plate to outer plate
the smallest gap at which the chain
guide does not contact the chain.
Chain
4. Intermediate adjustment
Adjust with the lever at the SIS
position. Set to the intermediate
gear position.
Largest gear Intermediate gear
Adjust by using the cable adjustment
bolt; set to the minimum clearance
at which the chain guide inner plate де”
and the chain do not contact. Chain guide
inner plate
5. Shifting check and monitor adjustment
After completion of 1—4, move the shift 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 bolt clockwise
(about 1/4 turn).
Return the top adjustment bolt counter-
clockwise (about 1/8 turn).
If shifting is difficult from the
intermediate gear to the large gear
If shifting is difficult from the
intermediate gear to the small gear
If shifting is difficult from the small gear
to the intermediate gear
If there is interference of the chain and
front derailleur inner plate at the largest
gear of the front chain wheel
If there is interference of the chain and
front derailleur outer plate at the largest
gear of the front chain wheel
Return the low adjustment bolt counter-
clockwise {about 1/4 turn).
Return the cable-adjustment bolt counter-
clockwise (about 1/2—1 turn).
Tighten the top adjustment bolt clockwise
(about 1/8 turn).
Return the top adjustment bolt counter-
clockwise (1/8 turn).
If, after the above minor adjustments, the shifting is still not satisfactory, check the
installation position of the front derailleur (the clearance between it and the large
gear, and whether it is correctly parallel with the large gear), turn the cable-
adjustment bolt 3 or 4 turns, and, after returning in the counterclockwise direction,
once again make the adjustment described in the section “Adjustment”.
Please note: Specificalions are subject to change for improvement without notice. (English)
SHIMANO (SINGAPORE) PTE. LTD.
No 20 Benoi Sector, Jurong Town, Singapore 2262 Tel 2654777
SHIMANO (EUHDPA) GmbH. SHIMANO 'NOUSTRIAL CO.LTD.
Im Hulsenteld 13 4010 Hilden; West Germany Tel. 02103-5005-0 3077 Omatsurho Sakar Osaka Japan Tel (0722) 23:3243
O Jul, 19883 by Shimano Co., Ltd. R-49 XBC IZM Printed in Japan
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