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Shimano 3CC hub adjustment?
I'm finishing up the build of a sweet kids bike, including a NOS Shimano
3CC coaster brake hub of unknown vintage. (Thanks again to Andrew as the source of the appropriate but rare shifter.) The bike is a very lightweight and pretty little antique. It also has hand brakes. The bike is in my workstand and ready to go, but I have one worry. When turning the cranks, there seems to be excess resistance. It's not the bottom bracket, because I overhauled that, plus the cranks feel very free during the forward or backward motion until the drive or the brake engage. It doesn't affect coasting; the rear wheel seems to spin very freely, so the coaster brake is not dragging. The friction seems to be in the drive motion itself. (About five and ten years ago, I resurrected two other bikes with Shimano three speed hubs and don't remember feeling this resistance. But that was long ago.) I've added lubricating oil via the axle's pushrod hole, but so far I perceive no difference. I'm (understandably?) reluctant to disassemble the hub, not only because I'd like to deliver the bike in three days. Is there a reasonable chance it will "wear in" and loosen up? Should I consider a solvent flush and adding oil? Or I wonder if there's a bearing adjustment that applies to the drive mechanism, separate from the main wheel bearings? I've gazed at the Shimano hub manual available at Sheldon's site https://www.sheldonbrown.com/sutherl...-5-shimano.pdf but at least so far, I don't recognize a solution there. Any tips? -- - Frank Krygowski |
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