Derailleur problem

[Zebb]

I am having difficulty with the derailleur on my kk, I have looked on the net to see how far from the cogs the top wheel on the derailleur should be but cant be sure really how to measure that, it will work down the gears fine, with the slightest of adjustment on the cable, but then wont go back up to the low gears nicely.Can get it back to the low gear tightening the cable, then back down to the high gears it doesnt like that.!!!

I have adjusted as per different videos on you tube but nothing cures it.

I am only turning the adjustment less than 16th of a turn or even less. so I am not
over adjusting.

Now it could be weak spring in the derailleur,the cable is very free in the outer cable, so its not that.

enclosed is a couple of shots showing in either high and low gear,

any one got an idea.!! Please.

It used to be really good but not so much now, could it be worn cogs.?

 

[Deleted member 4366]

See that little screw in the upper middle of the second (left) photo on the back of the hanger, screw it in - right in if necessary.

 

[Streethawk]

First thing to do when setting a derailleur up is to disconnect the cable and set the high screw to line up directly under the high gear and the low screw directly under the low gear. Then connect the cable with no slack in it so that the chain stays put in the smallest cog. Following that system it should be indexed to get all the bigger cogs. If it isn't, a slight tightening or loosening of the cable is all you should need to do, on the cable adjuster.

 

[Streethawk]

For more detail see:

Derailer Adjustment

 

[Zebb]

First thing to do when setting a derailleur up is to disconnect the cable and set the high screw to line up directly under the high gear and the low screw directly under the low gear. Then connect the cable with no slack in it so that the chain stays put in the smallest cog. Following that system it should be indexed to get all the bigger cogs. If it isn't, a slight tightening or loosening of the cable is all you should need to do, on the cable adjuster.

Thanks, I agree, done that, as per videos, still wont have it, works in a fashion but never good enough.
No matter how I try and set it up same problem. But I do appreciate the reply and help.

Thanks again/.

 

[Zebb]

See that little screw in the upper middle of the second (left) photo on the back of the hanger, screw it in - right in if necessary.

So you think it should be be further away from the cogs.?

 

[Deleted member 4366]

The screw on the back of the hanger adjusts the chain tension. It'll help pull your gears up. Screw it right in, and you'll see. It would've been quicker to screw it in than ask another question!

 

[Zebb]

The screw on the back of the hanger adjusts the chain tension. It'll help pull your gears up. Screw it right in, and you'll see. It would've been quicker to screw it in than ask another question!

Done as you suggest, thanks, still the same problem but more clunky (is that a word) adjust just enough
to climb into low gear, then wont come back down on slack, slackened off to get low to high just right
wont go back to low as not enough tension on cable.

Tis a pain in the A~~~

 

[oigoi]

Have you tried oiling all of the inner cable in case it is sticking? This can stop it dropping onto the smaller cogs because the spring in the derraileur is fighting the friction in the cable.

Sometimes the friction stopping the cable coming back when the spring is trying to pull it is right back in the shifter. Gripshift are bad for this

 

[D C]

It sounds like you've done everything right, it could just be simply worn out in which case you will never get it to work well.
They do get a lot of wear, from grit etc. and are also easily bent which isn't always easy to see or fix properly, also the spring may have become weak so maybe best to bite the bullet and get a new one.
Shouldn't break the bank from around a tenner upwards.

 

[Zebb]

Thank you for the replys, I replaced the cable only yesterday, just to be on the safe side, can easy
move the inner cable when its on the bike, so its not snagging, I have just stripped it down once again
to clean,will try again tomorrow then will try another derailleur, I have checked for any bends or twists
but I cant see nothing, I have set this up before ok with no problems, even worked great with half a turn
either way on adjustment, so only posted this thread cos i wasn't getting anywhere near fast.


Again thanks.

 

[Streethawk]

Dc may be right, however I'd try taking the derailleur off, clean it thoroughly, soak in motor oil overnight and reassemble with a new cable. Also worth checking the shifter is working, you can easily do this with the new cable before you thread it into the new outer. IMO, it's well worth changing cables annually, unless you splash out for a sealed set like Gore Ride On cables.

 

[Zebb]

Dc may be right, however I'd try taking the derailleur off, clean it thoroughly, soak in motor oil overnight and reassemble with a new cable. Also worth checking the shifter is working, you can easily do this with the new cable before you thread it into the new outer. IMO, it's well worth changing cables annually, unless you splash out for a sealed set like Gore Ride On cables.

Thanks... posted at the same time. As above yours.

 

[johnc461165]

Worn chains can cause bad changes. https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=video&cd=19&cad=rja&ved=0CF8QtwIwCDgK&url=http://www.youtube.com/watch?v=rtu6_IJUIbE&ei=6-AMUuHIO6S40QWbs4CwCA&usg=AFQjCNGGYfT65M_y1_EcbhKV3_Q9PDyDaQ

 

[D C]

Worn chains can cause bad changes. https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=video&cd=19&cad=rja&ved=0CF8QtwIwCDgK&url=http://www.youtube.com/watch?v=rtu6_IJUIbE&ei=6-AMUuHIO6S40QWbs4CwCA&usg=AFQjCNGGYfT65M_y1_EcbhKV3_Q9PDyDaQ

This is very true, though if the chain is very worn the cassette will be as well and if you don't replace the cassette at the same time, a new chain can make things worse as it may not mate up with the old worn teeth.
I just replaced my chain and rear cassette and found that I also needed to replace the middle front chain ring as well as the chain was jumping off under load.
I'm still on the original 14 years old front and rear mech but gear changes are now silky smooth.
It can get expensive once you start.

 

[Robw1uk]

Worn chains can cause bad changes. https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=video&cd=19&cad=rja&ved=0CF8QtwIwCDgK&url=http://www.youtube.com/watch?v=rtu6_IJUIbE&ei=6-AMUuHIO6S40QWbs4CwCA&usg=AFQjCNGGYfT65M_y1_EcbhKV3_Q9PDyDaQ

hello zebb

i thought my gears was naffed took mine to a shop had them done , then went again . checked the chain and a link had give way and kinked it so bought a new chain and all is good .

 

[Zebb]

Thanks for the reply's, chain was replaced about 400 miles ago as it snapped. So could be that its not happy with old cogs, got new derailleur on the way, if that doesnt work will try something else, at the moment got the gears going low to high ok but have to tease them back the other way. LOL.

Such fun.

Again thanks to all.

 

[johnc461165]

I was suggesting the chain maybe to long.

 

[Zebb]

I was suggesting the chain maybe to long.

Sorry,Thanks, chain is correct length, its only the last 60 miles or so this has happened been fine until then.

new chain was around low and large front cog, not going through derailleur and 2 links extra, or what ever the amount of links extra the internet said when i looked.Also checked against old chain.

I do thank you again for the help.

 

[Zebb]

I have fitted my new dérailleur today, and all is working very well, so for what ever reason it was causing me a problem its now fixed. I would like to thank every one for the input and help.
It so nice to change gear and it just works.!