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How to adjust Shimano ST ef40 7R - Cycling

Posted by Anonymous on


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Posted on Jan 02, 2017

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SOURCE: How to adjust shimano acera x ST-M290 shift

Take the allen bolt out take it apart if nothing is broken it will a need cleaning.A spray solvent and work the springs up and down no oil should be a quick fix.

Posted on Oct 12, 2009

  • 4 Answers


Remove the top plastic cover secured by two small screws

-At first glance you'll only notice half of the gears teeth, and as you shift the lever it will apear that the lever's push will bottom out and will not shift past the 4th or 5th gear.
- If you look close with a light you will see that teeth run completely along the entire gear and the teeth get super small just before the biggest tooth of the gear.
-the problem is that the shifter's cam (hooked lever) aka engager is seized and cannot swing into and bite into the smaller teeth.
-With some lube or even wd-40 spray the engager and exercise it with a small screwdriver so it can loosen up and spring into the small teeth.
-Start shifting and releasing several times to work the the lube in
- Install the cover and you're done!

Posted on Nov 03, 2011

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