Seized rear mech

iain_j Posts: 1,941
edited December 2009 in Workshop
Gave my drivetrain some TLC last night after the Christmas break, and discovered that the top pivot of my rear mech (Shimano Deore) has almost seized up - it'll pivot with some effort. So I went to take it off to have a closer look, and the bolt was the same - not quite seized up, but not far off. I did get it off eventually. The bolt threads and the threads in the hanger are fine, but the bolt will hardly turn within the pivot. I'll be blown if I can get it back on.

Any suggestions if/how I can free it up? Or is it down to the shop for a new one? (hope not, I'll go crazy if I have to wait til next payday to ride my bike :( )


  • Start with WD-40, Is good for freeing seized parts (Not to be used as a lubricant) Re lub with TF2
    Mobile Bicycle Mechanics Specialist
  • desweller
    desweller Posts: 5,175
    When I had this problem last year, I soaked the mech in a bath of warm engine oil for 30 minutes. Sorted.
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  • andyrr
    andyrr Posts: 1,822
    You can remove the bolt from within the mech - think there is a circlip or washer holding it in place. That will then allow you to lube it but the warm oil as per above sounds as good an idea.
  • John C.
    John C. Posts: 2,113
    I'd go for the diesel bath and then in a thicker oil once everythings working again,

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