Does anybody know how to mend gears on a Claud Butler push bike?

I have a Claud Butler bike with 21 gears. There are 7 on one side and 3 on the other, with click up and click down levers (sorry, its the only way I can describe it!). For some reason this has stopped working and the gears wont go lower than 3 (on the 7 side one) or 2 (on the 3 side one).

When I change gears, the wire appers to go really slack but when I tried to tighten this down by the back wheel, it has stopped all of the gears working.

Any suggestions?Does anybody know how to mend gears on a Claud Butler push bike?
there is a manual to download in the link and J G's link give the info as well because they are Shimano gears. Check the adjustments are right using the info in the manual probably won't be anything more than a cable needs tightening up.



http://www.falconcycles.co.uk/CORP/PDFs/Does anybody know how to mend gears on a Claud Butler push bike?
Have you tried using a different derailleur? Maybe the cable through from the derailleur needs tightening? Get a spanner, undo the nut on the derailleur, pull the cable tight with mole grips of pliers when the bike is in its highest gear (chain on top ring of rear cassette and top crank by pedals) then tighten nut back up.



Hopefully this works and you can get back to using your bike to its full potential!
Good advice above: Not sure whether your bike has Shimano gears, but instructions for front %26amp; rear adjustment from here;

http://bike.shimano.com/publish/content/



Most other makes are similar.

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