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SHIMANO ALTUS ST-EF51 EZ FIRE PLUS 7 SPEED SHIFTERS wont shift gear

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Posted on Jan 02, 2017

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SOURCE: shimano tiagra 9 speed shifters how to change gear

Go to http://techdocs.shimano.com/techdocs/index.jsp

Search in drop down list to go to all tiagra items and identify your particular components. Shimano are good at numbering their parts and you should find the number you seek on the bicycle component. You will usually be able to download an exploded parts diagram and service instructions. The service instructions are prefixed by the letters SI.

Posted on Nov 22, 2009

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SOURCE: ST EF20 SHIMANO right

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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The old lubricant has gummed up. It needs a good cleaning and relubrication.
"STI shifters gum up after years of use. I've had good luck with this method and since it's nearly free it's probably worth a shot--

"Get a can of WD-40 or a similar light solvent/oil solution. Pull the brake lever back to the bar to partially expose the shifting mechanism and generously hose down the interior with your solvent. I mean really get it in there from all directions, using the little red spray tube if possible. Let it sit for a while and then drizzle in some light oil like Tri-Flo or similar. Then wipe down the exterior of the shifter with some Simple Green or other degreaser (to keep the overspray off your hands).

"I've rescued two sets of STI-type shifters with this method. Hope you get your problem solved one way or another, because new Dura-Ace sure ain't cheap."

source: http://www.bikeforums.net/archive/index.php/t-83743.html

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