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@yoav
Assuming none of the parts are dirty/damaged/worn then the combination should work.
If you haven't done so already, remove the cable, check for any damage, lubricate and replace. Then slacken off all the tensioners and the limit screws and start from the beginning.
I'm not going to detail every step of dérailleur setting but there is a good step-by-step guide on the Park Tool website.