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Rear derailer problem....I think

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Rear derailer problem....I think

Old 04-29-12, 04:06 PM
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xjken99
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Rear derailer problem....I think

My son wants to start riding with me, so I pulled an old Pacific mtb out of the shed. I cleaned off everything, lubed everything I could think of and aired up the tires. Got on the bike and headed down the street changed a couple of gears and rings, everything seemed to work fine until I stopped pedaling. When I stop pedaling the chain gets a lot of slack in it and almost drags the ground. If I remove my feet from the pedals the crank kinda snaps back and the chain returns to where it should be. When I got it back home I inverted the bike and started pedaling by hand but when I stop I notice the bottom arm and spocket pivot forward causing the chain to slack. I realize this is probably not the best discription but, any ideas what is going on and how to fix it? I would like to try and fix the problem myself before I take it to the LBS and pay 40 or 50 dollars for something I may be able to do.
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Old 04-29-12, 04:13 PM
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jimc101
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Bent hanger, seized jockey / pulley wheels, stiff link in chain, seized freehub / freewheel. so many possibilities, would start be stripping everything down, and eliminating components one at a time.
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Old 04-29-12, 07:10 PM
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1. Take off the back wheel. Lay it across a trash container with the cogs faceing up.
2. Spin the cogs with your fingers. Notice what turns with the cogs and what stays stationary with the wheel.
3. Drip a little light lube into the crack between the moving and stationary parts. Give it a few minutes to soak in.
4. Try spinning the cogs again, they should spin freely. If they don't, repeat "3".

My bet is that'll fix it.
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Old 04-30-12, 08:23 AM
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Concur it is probably a gummed up freewheel. A proper clean and Reuben should fix you up.
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Old 04-30-12, 06:48 PM
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Thanks everyone for the great advice. Cleaned the chain and rear sprocket yesterday along with lubing anything that moves, pivots or turns. Got the bike out after work today and took off down the street. Everything appears to be working fine but, we will give it a good test Wednesday.
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