Gear slippage/adjustment

[outlash]

I've got to that point with my new(ish) bike that it's needed the gears adjusting (It's done 150 miles or so). Gears are slipping across the cassette and it's grinding on the smallest cog. So after a bit of research it would appear that the likeliest issue was the gear cable has stretched a bit so I tried using the barrel screw at the back of the mech to take the slack up but it barely turns (1 1/2 turns max) before the screw appears to come out of the housing or feels fully screwed in.
How many turns has it supposed to have? (It's a shimano 2300 BTW).

Worse, after having a go, it now appears that the derailleur won't drop down to the lowest cog and looks like it's been knocked out of alignment even though all I've done it try to turn the cable adjustment screw. Where do I go from here apart from down to the LBS?


TIA

Tony.

 

[gwhite]

It does sound like the original position of the adjustment screw was too far unscrewed to begin with. Start by screwing this into the socket fully and then back it out around four full turns.Then consult the Parktools site and there you will find detailed instructions on how to adjust the RD.
http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur

 

[outlash]

Thanks for that, I'll have a look .


Tony.

 

[outlash]

Hm, worked my way through the article without much success . No matter what I do, I can't get the chain to drop onto the smallest cog.


Tony.

 

[rusty bearing]

Undo cable clamp on rear mech and if its set right it should drop on the small cog automatically when turning the pedals, if not adjust the H(igh) limiter screw until it does then re-clamp the cable and re-adjust cable tension till perfect. If you don't have a work stand get a mate to hold up the back end.

 

[outlash]

Success! I think. I loosened the cable and was able to reset the H screw properly . Just taken it for a short test and apart from the extremeties of the cassette where there's a bit of noise (possibly from the front mech), the gears are behaving themselves much better . Thanks for your help.


Tony.