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Shimano Acera Ez Fireplus 21speed - Can this be fixed or serviced?

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Shimano Acera Ez Fireplus 21speed - Can this be fixed or serviced?

Old 10-29-11, 11:25 AM
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skieslord
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Shimano Acera Ez Fireplus 21speed - Can this be fixed or serviced?

I have this old school shifters on one of my bikes,

The rear derailleur moves two gears up or down when I shift, and I think it's the shifter since already tried all my "adjusting techniques" learned at youtube.

This is what exactly happens. If I go all the way on the biggest sproket and then start going down, I have to press twice to advance the next lower gear, and the about the 3rd gear, it jumps down to 1st without touching the 2nd. That same think happens from 1st to 7th gear.
I have lossen or tighten tension on the cable, moved the adjusting screw, etc. etc. and I think it may be the shifter as I stated before.
Any ideas of what would be. Can I service those shifter, rebuild or something or better start looking for a new ones.

Thanks in advance,
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Old 10-29-11, 12:04 PM
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mechBgon
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I would try this:

1. check your rear derailleur hanger alignment.

2. find a clean, uncluttered place and remove the top cover from the shifter with a small Phillips screwdriver (the screws are small and easy to lose, hence the clean uncluttered work area). Spray some WD-40 or Tri-Flow oil into the shifter's guts while shifting it up and down repeatedly. If the ratcheting bits are gummed up and sticking, this will help.

3. check your upper derailleur pulley for excessive "flop" in its bushing. If it's getting angular play as opposed to simple lateral slide, it's not helping.

4. check that the shift cable slides pretty smoothly in the cable housings. Replace if they're scratchy or gummy.

5. readjust the rear derailleur from the beginning, see Park Tool's how-to guide.

When you're done with that routine, you'll have some handy new skills If you do want to get new shifters, they key factors will be:

1. get a set that is made for V-brakes, since I see from the photo that yours are V-brake

2. get a set with 7 speeds in the rear, since yours are 7sp, not 8sp.

Last edited by mechBgon; 10-29-11 at 12:09 PM.
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Old 10-29-11, 01:21 PM
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skieslord
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Thanks for the repply... this afternoon I will work on it, there are few thing you mentioned that i did not considered such hanger aligmente and the flot in derailleur pulley. the guide at parktool is very complete, I definetely try all those steps. thanks again.
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Old 10-30-11, 10:33 PM
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skieslord
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I got it to work, I followed those steps closely and now everygear is coming smooth.. tnx a lot..
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Old 10-30-11, 11:31 PM
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Excellent
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