Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Malfunctioning shifter - Shimano ST-EF28?

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Malfunctioning shifter - Shimano ST-EF28?

Old 03-18-11, 11:49 PM
  #1  
akamarcus
Newbie
Thread Starter
 
Join Date: Mar 2011
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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
akamarcus is offline  
Old 03-19-11, 12:04 AM
  #2  
Sixty Fiver
Bicycle Repair Man !!!
 
Sixty Fiver's Avatar
 
Join Date: Sep 2007
Location: YEG
Posts: 27,276

Bikes: See my sig...

Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 43 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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.
Sixty Fiver is offline  
Old 03-19-11, 04:17 AM
  #3  
jimc101
Senior Member
 
Join Date: Oct 2007
Location: West Yorkshire, United Kingdom
Posts: 5,406
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 274 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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

http://techdocs.shimano.com/media/te...9830609273.pdf
jimc101 is offline  
Old 08-14-17, 08:47 AM
  #4  
Thor of Norway
Newbie
 
Join Date: Aug 2017
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I have same problem. You have to lubricate.
Thor of Norway is offline  
Old 08-14-17, 10:29 AM
  #5  
fietsbob 
coprolite
 
fietsbob's Avatar
 
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 40,316

Bikes: 8

Mentioned: 179 Post(s)
Tagged: 0 Thread(s)
Quoted: 6358 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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.
fietsbob is offline  
Old 08-14-17, 10:38 AM
  #6  
Andrew R Stewart 
Senior Member
 
Andrew R Stewart's Avatar
 
Join Date: Feb 2012
Location: Rochester, NY
Posts: 11,372

Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Raleigh Pro, Trek Cycle Cross, Mongoose tomac ATB, GT Bravado ATB, JCP Folder

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1652 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
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
Andrew R Stewart is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.