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Old 01-10-19, 04:19 PM
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Bikes: old school 531c & campy

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Originally Posted by shoota View Post
I'm not sure what this screw/bolt is responsible for yet:
It's pretty obvious your cage tension spring wasn't loaded properly to tension the chain. It's probably difficult to do if the grub screw is missing. the grub grub screw allows you to load the spring and then prevents it unwinding all the way when the chain doesn't hold the tension (like when the derailleur or wheel isn't mounted.) In the video, notice the grub screw stops the cage from unwinding after he pulls and releases the cage by hand.

Youtube hack, rj the bike guy, has a couple suntour derailleur videos where he shows how the grub screw is removed before unwinding the cage and then replaced after he overhauls the derailleur. Search youtube for "suntour overhaul."

Last edited by SurferRosa; 01-10-19 at 04:36 PM.
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