07-18-2013, 04:36 PM
Hey, folks. I'm new to the forums, and new to coaster-brake hubs. Two of them in our shop are experiencing problems. When I grip the brake bar and try to turn the sprocket, it will turn and kinda click as I turn, and it does it in both directions, which tells me the drive chain won't really engage the wheel when you pedal, and the brake probably doesn't work either. That sprocket will also wiggle just a bit. So I'm thinking maybe the hub's too loose. But when I'm gripping the brake bar to hold the axle still, the wheel turns maybe one or two rotations and stops, and you can feel the bearings grinding a bit, like the hub is too tight. I can't test-ride it, but on the other ones we have like these, that sprocket doesn't wiggle (these are basically kids' novelty bikes, called banana peels.)
I've been watching videos and whatnot for them for a week with no success. I've taken one of the two that I'm having problems with apart entirely, which was helpful for me, but I'm stuck as far as actually diagnosing this problem. Any ideas?
PS, on the one I took apart, I'm not seeing any real wear, pits, etc. These are all new, but they were assembled by...folks who aren't bike mechanics, I guess. So it may have been wrong from the beginning.
I've been watching videos and whatnot for them for a week with no success. I've taken one of the two that I'm having problems with apart entirely, which was helpful for me, but I'm stuck as far as actually diagnosing this problem. Any ideas?
PS, on the one I took apart, I'm not seeing any real wear, pits, etc. These are all new, but they were assembled by...folks who aren't bike mechanics, I guess. So it may have been wrong from the beginning.