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Malfunctioning shifter - Shimano ST-EF28?

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Malfunctioning shifter - Shimano ST-EF28?

Old 03-18-11, 11:49 PM
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Malfunctioning shifter - Shimano ST-EF28?

Hi all,

I am totally new to bike repairs. I am very much a DIY guy, but I can't figure this one out. My dad gave me his ~10 year old Diamondback bicycle. Not a bad bike for commuting, just basic. I think the shifters are "rapid fire" (not sure if that's the correct term) type. I took some photos to show the problem.

Basically, the front deraileur will not shift into third gear. It's not a problem with the cable, or limit screws. The shifter will shift into 2nd just fine from first, but it will not shift into 3rd. It's like there's nothing there. The photos show successively: 1st gear; transition from 1st to 2nd gear; 2nd gear; attempt to transition from 2nd to 3rd gear;

I don't know how else to describe the problem. The little sprocket inside is not damaged, and is metal, so I can tell nothing has broken off. Besides, it wouldn't rotate within that casing if there were more fins to it. The shifter (as far as I know) has never been taken apart, and used to work when I first started using it about a year ago. Any help and suggestions are much appreciated!

Sorry about the photo order. View them in the order underlined above! Thumbnail file names are titled appropriately.
Attached Images
File Type: jpg
1st Gear.jpg (92.7 KB, 47 views)
File Type: jpg
2nd Gear.jpg (89.2 KB, 44 views)
File Type: jpg
Attempt transition 2 to 3.jpg (88.7 KB, 44 views)
File Type: jpg
Transition 1 to 2.jpg (90.2 KB, 45 views)

Last edited by akamarcus; 03-18-11 at 11:51 PM. Reason: update
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Old 03-19-11, 12:04 AM
Sixty Fiver
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Are these your shifters ?

Have more experience with the older 7 speed version which has always seemed pretty bombproof... technical documents can be found online to see where things might be amiss.
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Old 03-19-11, 04:17 AM
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Time to buy new ones, Rapidfire shifters are not user servicable to the level you have striped them to. Also parts and time taken investigating the issues wll be far more than the cost of replacing them.

The tech docs give an idea of how much can be serviced

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Old 08-14-17, 08:47 AM
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I have same problem. You have to lubricate.
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Old 08-14-17, 10:29 AM
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buy new ones.. since grease hardening is not the issue.. Shimano doesn't do internal spare parts , just whole shifter assemblies

get a brake lever , and separate , friction thumb shifters.. for the triple..

that will be reliable thru simplicity..


Last edited by fietsbob; 08-14-17 at 10:34 AM.
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Old 08-14-17, 10:38 AM
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Since spraying on light lube is so easy to do and also helps flush loose grit off I'd do that if only as a diagnostic step. I don't have a set of these shifters in sight right now but the spring along the lower portion of photos 2,3&4 looks to have it's hook end loose and freely floating. But since compatible shifters are so inexpensive and often available used, if your LBS does a good service business, I'd replace rather quickly instead of spending a lot of time and frustration. Shimano has made a great number of EF series shifters. Match the cog counts and the brake type and you're good to go. Andy
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