SERVICE INSTRUCTIONS

SI-F920A

Front Drive System

Before use, read these instructions carefully, and follow them for correct use.

WARNING

Use neutral detergent to clean the chain. Do not use alkali-based or acid based detergent such as rust cleaners as it may result in damage and/or failure of the chain. Use the reinforced connecting pin only for connecting the narrow type of chain. There are two different types of reinforced connecting pin available. Be sure to check the table below before selecting which pin to use. If connecting pins other than reinforced connecting pins are used, or if a reinforced connecting pin or tool which is not suitable for the type of chain is used, sufficient connection force may not be obtained, which could cause the chain to break or fall off.
Chain 9-speed super narrow chain such as CN-7701 / CN-HG93 8- / 7- / 6-speed narrow chain such as CN-HG50 / CN-IG51 Reinforced connecting pin

Silver

Chain tool TL-CN31/TL-CN22 TL-CN31/TL-CN22 and TL-CN30/TL-CN21
If it is necessary to adjust the length of the chain due to a change in the number of sprocket teeth, make the cut at some other place than the place where the chain has been joined using a reinforced connecting pin or an end pin. The chain will be damaged if it is cut at a place where it has been joined with a reinforced Reinforced Connecting Pin End Pin Link Pin connecting pin or an end pin.
Obtain, read and carefully service instructions when installing parts. A loose, worn, or damaged parts may cause injury to the rider. We strongly recommend that only genuine Shimano replacement parts be used.

CAUTION

Be sure to use only the Shimano IG chain with the IG
front chainwheel. The HG or UG type of chain cannot be used.
Apply grease to the bottom bracket before installing it. For smooth operation, use the specified outer casing and the bottom bracket cable guide. 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. Outer casing holders When installing the top route type, choose a frame that has three outer casing holders as shown in the illustration at right. Use an outer casing which still has some length to spare even when the handlebars are turned all the way to both sides. Furthermore, check that the shifting lever does not touch the bicycle frame when the handlebars are turned all the way. Grease the inner cable and the inside of the outer casing before use to ensure that they slide properly. Operation of the levers related to gear shifting should be made only when the front chainwheel is turning. For maximum performance we highly recommend Shimano lubricants and maintenance products. For any questions regarding methods of handling or maintenance, please contact the place of purchase.
FD-MC18-S/18-SE Adjustment Bolts
Because of the different construction of the new link, the positions of the top and low adjustment bolts on the FD-MC18-S/18-SE are reversed from the positions on previous front derailleurs.
In order to realize the best performance, we recommend that the following combination be used.
Series Rapidfire Plus Outer casing Front derailleur Front chainwheel Bottom bracket Chain Bottom bracket cable guide ALIVIO ST-MC20 / SL-MC20 SP40 FD-MC18-S / FD-MC18-SE FC-MC19 / FC-MC20 BB-LP28 / BB-LP28-E CN-IG51/CN-IG31 SM-SP17 / SM-BT17 / SM-SP18 / SM-BT18

Specifications

Front Derailleur
Model number Normal type Top route type Front chainwheel tooth difference Min. difference between top and intermediate Front derailleur installation band diameter Stroke (A-A') Chainstay angle (a) Applicable chain line Installation band diameters: S (28.6 mm), M (31.8 mm), L (34.9 mm)

Stroke

FD-MC18-S

FD-MC18-SE

20T 10T S, M, L 38 - 58 63- 66, 66- 69 S, M 38 - 58 63- 66
20T 10T S, M 38 - 58 66- 69 L 38 - 58 66- 69 50.0mm

Chainstay angle

47.5mm, 50.0mm

Chainwheel

Model number Chainwheel tooth combination Bolt circle diameter Crank arm length Pedal thread dimensions 104mm / 64mm 170 mm, 175 mm BC 9/16" X 20 T.P.I. (English thread) FC-MC20 42T-32T-22T Riveted FC-MC19

Bottom Bracket

Model number Stamped marking Spindle length Chain line Thread dimensions MMmm 47.5 mm BC 1.37" X 24 T.P.I. (68mm) BB-LP28-E LLmm 50.0mm BC 1.37" X 24 T.P.I. (73m) M 36 X 24 T.P.I. (70mm) MMmm 47.5 mm BB-LP28 LLmm 50.0 mm

BC 1.37" X 24 T.P.I. (68, 73 mm) M 36 X 24 T.P.I. (70mm)
Installation of the Front Derailleur, Bottom Bracket and Front Chainwheel

< FD-MC18-SE >

Use the special tools (TL-UN65 and TL-UN74-S) to install the bottom bracket and the front derailleur so that they face as shown in the illustration. Install the adapter , and then use an 8 mm Allen key to install the front chainwheel.
Front Derailleur Front Chainwheel

Adapter

Bottom Bracket
Adapter / bottom bracket tightening torque: 50 - 70 Nm {435 - 608 in. lbs.} Front chainwheel tightening torque: 35 - 50 Nm {305 - 435 in. lbs.}

< FD-MC18-S >

Install using the special tool TL-UN74-S. First install the main body, then the adapter.

Adapter Main body

Adapter / bottom bracket tightening torque: 50 - 70 Nm {435 - 608 in. lbs.}
Use an 8 mm Allen key to install the front chainwheel.

8 mm Allen key (TL-WR38)

Securely tighten Front chainwheel tightening torque: 35 - 50 Nm {305 - 435 in. lbs.}
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

Pro-Set gauge

The level section of the chain guide outer plate should be directly above and parallel to the largest chainring. Secure using a 5 mm Allen key.
Tightening torque: 5 - 7 Nm {44 - 60 in. lbs.}
Chainwheel (largest chainring)

Chain guide

Installation of the chainrings
Be sure to use the following combination for the tooth configuration.

M 42-32-22 (FC-MC20)

Position so that, when looking from the rear side, the M- 3 marks come to the positions as shown in the illustration, and so that the chaindrop prevention pin is directly behind the crank arm.
Marks Chain-drop prevention pin Crank arm

Projecting parts

The features of the SIS will not be obtained if the chainrings are installed in the incorrect position, or if a chainring with a mark other than M- 3 is being combined. Therefore, be sure to install them in the correct position.

Chain length

Add 2 links (with the chain on both the largest sprocket and the largest chainring)
Largest sprocket Largest chainring
Checking the chain connection
For IG, chains, insert the chain gauge (TL-CN24) into the inner link which is next to the chain connecting pin to check that the inner link width is correct. Check that the connecting pin pro-trudes past the outer link by the same amount 2.38mm on both sides, and that the amount of Connecting pin protrusion is 0.2 mm or more.

A, B Q 0.2mm

SHIMANO JAPAN CHAIN GAUGE

Chain gauge TL-CN24

1=2.38mm TL-CN24

Inner link

Connecting pin

Outer link

Correct

Incorrect

Installation of the brake lever
Use a handlebar grip with a maximum outer diameter of 32 mm.

ST-MC20

Tightening torque : 6 - 8 Nm {53 - 69 in. lbs.}

5 mm Allen key

SL-MC20
Tightening torque : 5 Nm {44 in. lbs.}
Install the brake lever in a position where it will not obstruct brake operation. Do not use in a combination which causes brake operation to be obstructed.

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 0-0.5 mm.

Low adjustment screw

Chain position
Largest sprocket Smallest chainring Chain guide inner plate Chain
2. Connecting and securing the inner cable
Operate lever (B) two times or more, and check on the indicator that the lever is at the lowest position. Then remove the inner hole cover and connect the inner cable.
Inner cable Inner hole cover Lever (B)
Install the inner hole cover by turning it as shown in the illustration until it stops. Do not turn it any further than this, otherwise it may damage the screw thread.
Tightening torque: 0.3 - 0.4 Nm {3 - 4 in. lbs.}

Inner hole cover

Inserting the inner cable
Insert the inner cable into the outer casing from the end with the marking on it. Apply grease from the end with the marking in order to maintain cable operating efficiency.

Marking

Cutting the outer casing
When cutting the outer casing, cut the opposite end to the end with the marking. After cutting the outer casing, make the end round so that the inside of the hole has a uniform diameter. Attach the same outer end cap to the cut end of the outer casing.

Outer end cap

Cut off any unnecessary cable, attach an end cup and hook it onto the pin.
Note: Pass the cable through as shown in the illustration.
Wire fixing bolt 5 mm allen key
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 Pull

3. Top adjustment
Set so that the clearance between the chain guide outer plate and the chain is 0-0.5 mm.
Smallest sprocket Largest chainring
Top adjustment screw Chain guide outer plate
4. Adjustment of the intermediate 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.

Largest sprocket Intermediate chainring
Chain guide inner plate Chain
Outer casing adjustment barrel

5. Troubleshooting chart

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. If shifting is difficult from the intermediate chainring to the largest chainring. If shifting is difficult from the intermediate chainring to the smallest chainring. If there is interference between the chain and the front derailleur inner plate at the largest chainring. If there is interference between the chain and the front derailleur outer plate at the largest chainring. Tighten the top adjustment screw clockwise (about 1/4 turn). Loosen the top adjustment screw counterclockwise (about 1/8 turn). Loosen the low adjustment screw counterclockwise (about 1/4 turn). Tighten the top adjustment screw clockwise (about 1/8 turn).
Loosen the top adjustment screw counterclockwise (about 1/8 turn).
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 adjustment barrel clockwise the chain and front derailleur (1 or 2 turns). inner plate when the rear sprocket is shifted to the largest sprocket when the chainwheel is at the intermediate chainring position. If the chain falls to the bottom bracket side. Tighten the low adjustment screw clockwise (about 1/2 turn).

Gear shifting operation

Both lever (A) and lever (B) always return to the initial position when they are released after shifting. When operating one of the levers, always be sure to turn the crank arm at the same time.
To shift from a small chainring to a larger chainring
When lever (A) is pressed once, there is a shift of one step from a small chainring to a larger chainring. Example: Lever (A) initial position from intermediate chainring to largest chainring.
To shift from a large chainring to a smaller chainring

When lever (B) is pressed once, there is a shift of one step from a large chainring to a smaller chainring. Example: from largest chainring to intermediate chainring.

Lever (B)