Originally Posted by
pingpong91
My derailleur is now not playing nice and I think the spring has ceased up, as it is not springing back to its cocked position in some of the gears. This is causing my gears not shift correctly all the time, I am looking to remedy this issue.
Does this mean that the upper pivot spring is not consistently pulling the derailleur body back? This can be caused by a broken or disengaged upper pivot spring, but I would expect the problem to manifest in all gears, not just some. Can you remove the chain and assess how the upper pivot spring behaves on its own? If the spring does not pull the derailleur body back when the chain is removed, it is either broken or disengaged. The simplest fix is to replace the derailleur. If the spring works, but the pivot binds in some places, it may just need a thorough cleaning and lubrication.