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Can the shifter be removed from MTB brake lever-shifter combo

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Can the shifter be removed from MTB brake lever-shifter combo

Old 06-25-18, 01:56 AM
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Can the shifter be removed from MTB brake lever-shifter combo

Gf's bike has Shimano ST-M310 brake lever and shifter in one unit. I had no idea these existed for MTB. Anyways, the the right side shifter mechanism broke, but the brake lever is fine, and I'd like to replace only the shifter mechanism if possible.

Does this unit come apart or am I looking at replacing the whole unit along with the brake lever too?
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Old 06-25-18, 08:08 AM
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You may be able to cut out the shifter body
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Old 06-25-18, 08:12 AM
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Doesn't look like you can get a replacement shifter for that setup.

https://si.shimano.com/#/en/search/Keyword?name=ST-M310
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Old 06-25-18, 08:23 AM
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These can be opened, & then find out whats broken or gone wrong, buying or finding NEW parts is a non starter, the trouble with a replacement is you will need to buy a pair, I've opened stripped serviced many, but I don't think you will be lucky enough to find parts, but until you stripped it & know the problem is ? maybe a LBS depending on its size & if its been in operation for some time, & has a workshop may have some old / spares lever units, around & when people then upgrade systems you may be lucky to find a 2nd hand one.
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Old 06-25-18, 08:33 AM
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cleaning and re lubricating the shifter part already tried?
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Old 06-27-18, 12:13 AM
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Originally Posted by cobba View Post
Doesn't look like you can get a replacement shifter for that setup.

Manuals & Technical Documents
I was wondering if the entire shifter part could come apart from the brake lever somehow. I can get a pair of M410 shifters for like $10 and put those in, but if the brake lever works then I feel like it's a waste of a lever.
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Old 06-27-18, 12:17 AM
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Originally Posted by Bike tinker man View Post
These can be opened, & then find out whats broken or gone wrong, buying or finding NEW parts is a non starter, the trouble with a replacement is you will need to buy a pair, I've opened stripped serviced many, but I don't think you will be lucky enough to find parts, but until you stripped it & know the problem is ? maybe a LBS depending on its size & if its been in operation for some time, & has a workshop may have some old / spares lever units, around & when people then upgrade systems you may be lucky to find a 2nd hand one.
I didn't want to replace the internal parts. I was wondering if the shifter portion came apart from the brake lever portion somehow. But if the whole thing is cast as one block of metal, then that's a no go. I can get a set of used M410 shifters for $10 and put those in. But at the same time, I feel like I'm wasting the brake lever since that part still works
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Old 06-27-18, 12:18 AM
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Originally Posted by fietsbob View Post
cleaning and re lubricating the shifter part already tried?
I was not aware those shifters are serviceable in that way.
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Old 06-27-18, 01:11 AM
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Originally Posted by jsdavis View Post
but if the brake lever works then I feel like it's a waste of a lever.
Life in a throw away society.

the right side shifter mechanism broke
I was not aware those shifters are serviceable
Did something physically break on it or is there a problem with how it's working?
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Old 06-27-18, 01:33 AM
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The lever that increases tension will now only shift 2 gears in one throw, instead of 3. It won't engage shift until I the lever is pushed way way back. By the time it starts to engage, I would have expected the amount of lever travel would have shifted 3 gears already. But then I push further and it will shift 2 gears.

Last edited by jsdavis; 06-27-18 at 08:56 AM.
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Old 06-27-18, 02:15 AM
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Sounds like your cable may be binding. Clean/lube or replace the cable so it moves freely first through the hosings/tensioners. Make sure there are no kinks or sharp bends in the hosing.
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Old 06-27-18, 08:56 AM
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All the cables and housings were replaced a month ago.
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Old 06-27-18, 10:26 AM
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Originally Posted by jsdavis View Post
The lever that increases tension will now only shift 2 gears in one throw, instead of 3. It won't engage shift until I the lever is pushed way way back. By the time it starts to engage, I would have expected the amount of lever travel would have shifted 3 gears already. But then I push further and it will shift 2 gears.
This is a common Shimano problem. The mechanism inside the shifter gets gummed up and the pawls no longer catch or release as designed. Take the shifter cover off and clean the moving bits with triflow or other light oil. Watch how the pawls work and you should be able to spot where it is hung up.once that part is loosened and working freely, your shifter should be fine.
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Old 06-27-18, 11:17 AM
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Try blasting it out with something like speed-degreaser or other not-so-toxic aerosolized solvent. If you don't care about your health or the environment, try automotive brake cleaner. Work the shifter up and down the range. Should get better. Then lube it as best you can with light oil.
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Old 06-27-18, 12:45 PM
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Originally Posted by Aubergine View Post

This is a common Shimano problem. The mechanism inside the shifter gets gummed up and the pawls no longer catch or release as designed. Take the shifter cover off and clean the moving bits with triflow or other light oil. Watch how the pawls work and you should be able to spot where it is hung up.once that part is loosened and working freely, your shifter should be fine.
Huh...I have a couple sets of M590 and M570 shifters that are older and do not have this problem. Is it limited to lower level stuff, like Acera or Altus in this case? I generally go for Deore level for my own bikes, so I don't have experience with much below that.
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Old 06-27-18, 12:49 PM
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Originally Posted by mconlonx View Post
Try blasting it out with something like speed-degreaser or other not-so-toxic aerosolized solvent. If you don't care about your health or the environment, try automotive brake cleaner. Work the shifter up and down the range. Should get better. Then lube it as best you can with light oil.
I have Simple Green (normal green stuff), Simple Green Crystal, and WD-40. Would any of those work? I guess I have baking soda and borax hand cleaner also.

And environment safe paint thinner too, which I found useful for cleaning grease from my plastic garage sink.
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Old 06-27-18, 12:52 PM
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Take whatever covers off you can, blast a 1/2 can of WD through, relube. This usually returns the shifter to proper operation. Might as well do them both too.
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Old 06-27-18, 01:05 PM
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Originally Posted by jsdavis View Post
I have Simple Green (normal green stuff), Simple Green Crystal, and WD-40. Would any of those work? I guess I have baking soda and borax hand cleaner also.

And environment safe paint thinner too, which I found useful for cleaning grease from my plastic garage sink.
Originally Posted by dedhed View Post
Take whatever covers off you can, blast a 1/2 can of WD through, relube. This usually returns the shifter to proper operation. Might as well do them both too.
WD-40. Squirt into the interior of the shifter where the shifter levers enter the body of the shifter unit. This may take longer than other, more aggressive solvents. Squirt, work the shifter up and down the range, squirt, work the shifter up and down the range, repeat until you can feel it start to work, and then do it a few more times for good measure.
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Old 06-27-18, 01:06 PM
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Originally Posted by jsdavis View Post
Huh...I have a couple sets of M590 and M570 shifters that are older and do not have this problem. Is it limited to lower level stuff, like Acera or Altus in this case? I generally go for Deore level for my own bikes, so I don't have experience with much below that.
Seems to happen with a lot of Shimano stuff, independent of series, mtn/road, etc. Mostly, it's an age and disuse thing.
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Old 06-27-18, 01:11 PM
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To the original question, I have used a Dremel to cut off the shifter pod in the past on these Shimano integrated lever/shifter combo.
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Old 06-27-18, 01:42 PM
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Originally Posted by mconlonx View Post
Seems to happen with a lot of Shimano stuff, independent of series, mtn/road, etc. Mostly, it's an age and disuse thing.
These shifters are used daily...about 4000-5000 miles a year city riding over the past 5 years or so
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Old 06-27-18, 02:05 PM
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Originally Posted by jsdavis View Post
These shifters are used daily...about 4000-5000 miles a year city riding over the past 5 years or so
I would not say it is a “disuse” thing. What happens is that the original grease hardens with age, plus of course the usual dirt/water/more dirt that creeps in. The bad thing is that it happens; the good thing is that it is easy enough to clean out.
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Old 06-30-18, 03:01 PM
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I shot some PB Blaster in the shifter and it seems to work ok now.

I then tried to put Super Lube grease in there with a pick, but not sure how much got where because there isn't much free space inside to push the grease around. Any other lubricants that would work well in there? I'm thinking chain lube is too light.
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Old 07-01-18, 05:27 PM
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Originally Posted by jsdavis View Post
I shot some PB Blaster in the shifter and it seems to work ok now.

I then tried to put Super Lube grease in there with a pick, but not sure how much got where because there isn't much free space inside to push the grease around. Any other lubricants that would work well in there? I'm thinking chain lube is too light.
I usually spray some tri-flow or tef gel in there rather than grease because it works better in cold weather here.

https://www.lawsonproducts.com/Lawso...-PTFE/97673.lp
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