Shimano RD-L525 Light Action Rear Derailleur
I 've got an old Centurion LeMans RS with a Shimano RD-L525 rear derailleur that doesn't shift properly. I bought the bike new back in the late 80's and have replaced it but would like to see if anyone has any suggestions. I removed and cleaned the derailleur, same problem exists. Shifting is OK when the cable pulls the derailleur to move into a lower gear (larger sprocket on inside of wheel) but the derailleur does not return when I try to shift into a higher gear (smaller sprockets towards outside of wheel). The spring is not broken but seems to not have enough tension or strength ?