before i go and explode tiny parts and sprins all over the kitchen, a bit of help with thise please.
the big thumb shifter on this deore shifter, for shiftring down gears, is getting very temperamental and doesn't always grab the mechanism to shift down, ie it it just pushes against nothing. it seems a the ratchet or whatever the internal mechnism is, is not returning to position to be grabbed for next shift.
no problems shiftein gup so i'm guessing no issues with the cable.
is it just a case of popping-off the cover, cleaning and lubricating with something very light (or not even), or is it a more complex repair, or are these terminal signs?
try flicking the lever both ways and also flicking the other lever again but in my experience this usually means sooner or later you'll be browsing CRC. Ask for a 2nd hand one on the classifieds!
that's more or less what i do to get it to work.
so you haven't had any luck repairing?
Hi,
I had a similar problem on my last zee shifter, but my thumb shifter also didnt return to the correct position.
Turned out that a nut under the plastic cover under the shifter was undoing itself. The folded metal that I assume was supposed to stop the nut spinning was never folded enough to grab the nut so it slowly undid itself and the lever then eventually fell off on a night ride.
So I'd have a look there.
doesn't sound like that. the lever moves fine and returns un-hindered. it's the internal mechanism
bit of youtubing seems like it's just gunked-up. original grease dries up, just need a clean and lube. good.
Id go with with sticky / broken ratchet.
Disconnect the gear cable first and if possible remove from the bike.
You should be able to remove some of the casing (carefully as they are easy to break if you're heavy handed) to aid access.
You should be able to see the mechanism fairly easily and see if the ratchet or spring is broken.If its just sticky then attack it with WD40 or other thin penetrating lube whilst moving the lever until it starts to grab again keep at it and then follow up with some thicker lube, again working it in to the mechanism. Once its working satisfactorily leave it to stand to let any excess lube drain out and finally get some spray grease and apply that.
guid yin bigyin. that's what i was planning to do : )
Repaired quite a lot wih similar symptoms, usually just a case of removing the casing to expose a small ratchet with a hairspring that'll be gummed up with old grease. A few drops of GT85 on it's pivot, and a little working back and fore usually sorts it.
Before you do ANYTHING try this, I've lost count of how many shifters I've fixed like this-
Remove the cable grommet screw and flush it out repeatedly with GT85. Literally full it until it runs out the bottom. 10-20 second squirts. Then actuate the lever in both directions a lot. Keep doing it a few times.
Old grease goes hard and stops the ratchets working correctly. This flushes it out.
Then change the inner AND outer cables.
If that doesn't fix it, and 9 times out of 10 it will, it's usually new shifter time.
I've only ever had to do what PeterPoddy said ^^^
i just popped off bottom cover and gave it a clean up with wd40.
no need to waste cleaner by filling it from the top. and cabels didn't need changing, as i said.
also easy to see what's going on and to give it a better clean.
back to nice and clicky : )
no idea why i didn't just go and look at it rather than twiddling my thumbs on the forum. probably cos i wanted to drink COFFEE and waste time...