Shimano RD-TX35, RD-TX55, RD-TX75 - Rear Derailleur Technical Service Manual

Installation of the rear derailleur

Chain length

Add 2 links (with the chain on both the largest sprocket and the largest chainring)

Cable securing and stroke adjustment

Place the outer casing so that it does not touch the basket and mudguard, otherwise it may cause a problem with the performance of the derailleur.

Set the outer casing (RD-TX75/RD-TX55) so that its length is as follows.

• If routing the casing upward:
  (The chain should be on the largest chainring and on the largest sprocket.)
  Add 10 mm to the length of the outer casing from the end that is inserted into the outer casing holder to the end which is inserted into the link.
  
  
• If routing the casing downward:
  (The chain should be on the largest chainring and on the largest sprocket.)
  Set the length of the outer casing so that it describes a smooth arc, and so that the link stops in a position where there is a small gap between the link and the link stop.
  
  Connect the inner cable to the derailleur as shown in the illustration.
  

This service instruction explains how to use and maintain the Shimano bicycle parts which have been used on your new bicycle.
For any questions regarding your bicycle or other matters which are not related to Shimano parts, please contact the place of purchase or the bicycle manufacturer.

1. Top adjustment
   Turn the top adjustment screw to adjust so that the guide pulley is below the outer line of the smallest sprocket when looking from the rear.
   
2. Connection and securing of cable
   Connect the cable to the rear derailleur and, after taking up the initial slack in the cable, reattach to the rear derailleur as shown in the illustration. Secure the cable by pulling it with pliers with a force of 5 - 10 kg.
   
3. Low adjustment
   Turn the low adjustment screw so that the guide pulley moves to a position directly below the largest sprocket.
   
4. How to use the B-tension adjustment screw
   Mount the chain on the smallest chainring Largest sprocket Smallest sprocket and the largest sprocket, and turn the crank arm backward. Then turn the B-tension adjustment screw to adjust the guide pulley as close to the sprocket as possible but not so close that it touches. Next, set the chain to the smallest sprocket and repeat the above to make sure that the pulley does not touch the sprocket.
   

SIS Adjustment

Operate the shifting lever several times to move the chain to the 2nd sprocket. Then, while pressing the lever just enough to take up the play in the lever, turn the crank arm.

When shifting to 3rd


Tighten the outer cable adjusting barrel until the chain returns to the 2nd sprocket. (clockwise)


Best setting*

When no sound at all is heard


Loosen the outer casing adjustment barrel until the chain touches the 3rd sprocket and makes noise. (counter clockwise)


*Best setting

The best setting is when the shifting lever is operated just enough to take up the play and the chain touches the 3rd sprocket and makes noise.
* Return the lever to its original position (the position where the lever is at the 2nd sprocket setting and it has been released) and then turn the crank arm clockwise. If the chain is touching the 3rd sprocket and making noise, turn the outer casing adjustment barrel clockwise slightly to tighten it until the noise stops and the chain runs smoothly.
For the best SIS performance, periodically lubricate all power-transmission parts.

Parts

1. Same parts.
2. Parts are usable, but differ in materirals, appearance, finish, size, etc.
   Absence of mark indicates non-interchangeability.

© Shimano Inc. A
Specifications are subject to change without notice.
One Holland, Irvine, California 92618, U.S.A. Phone: +1-949-951-5003 Industrieweg 24, 8071 CT Nunspeet, The Netherlands Phone: +31-341-272222
Service Instructions in further languages are available at: http://techdocs.shimano.com
Please note: specifications are subject to change for improvement without notice. (English) © Mar. 2010 by Shimano Inc. XBC IZM Printed in Singapore.