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Old trek 820 front shifter doesn't click

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Old trek 820 front shifter doesn't click

Old 06-07-17, 08:58 AM
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dkoppenhaver
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Old trek 820 front shifter doesn't click

On the front three gears the button moves and the derailleur arm moves, but returns to small gear. There is no click on the push button which I am guessing is what holds the arm in position over the larger two gear sets. The rear button works good. It clicks and holds it's position and the smaller button allows it to return.
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Old 06-07-17, 09:11 AM
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cpach
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Originally Posted by dkoppenhaver View Post
On the front three gears the button moves and the derailleur arm moves, but returns to small gear. There is no click on the push button which I am guessing is what holds the arm in position over the larger two gear sets. The rear button works good. It clicks and holds it's position and the smaller button allows it to return.
Old shifters can have their grease get dirty and/or gummy. This can usually but not always be resolved by degreasing and cleaning the shifters and relubricating them. Shimano (apparently) recommends using a dry chain lubricant after degreasing. If you can remove the shifter from the bike I'd recommend soaking it in a degreaser overnight (dish soap, mineral spirits, etc) rinsing it out thoroughly, drying it, and applying some kind of lube. On the bike, using a spray petrochemical degreaser works well. A lot of people fix this problem by just blasting WD-40 or triflow into the shifter. Make sure you work the shifter back and forth a bunch. If you still can't get it to shift when clean and relubricated, you may be able to partially disassemble the shifter so you can force it to shift by pressing on the pawls with a dental pick of small flat bladed screwdriver.

If this sounds daunting at all just take it to a shop. The odds are they blast it with some light oil from the can and work it a bit and get it running for $10-20.
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Old 06-07-17, 09:37 AM
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fietsbob 
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Thats a Good Thing...I hate STI front shifters. get a friction thumb shifter..
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Old 06-07-17, 01:50 PM
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With luck the washout/degreaser relube approach will fix it, but it is also possible that the ratchet mechanism within the shifter
has failed in a catastrophic (ie non fixable) fashion. A 3d, much less likely scenario is a frayed or broken cable within the
shifter that is screwing up the works, so always pull the cable completely out of the shifter before cleaning attempts.
My experience with 8 and early 9spd brifters was a tendency to sudden death at an early age (2k to 10k miles). A 10spd
DA set is going well at 21k miles. OTOH a 10spd 105 brifter is dicey on the 25t cog of an 11-28 cassette at 10k miles.
R brifters wear out much faster than L brifters in general.
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