Can't remove cranks?

kingofthetailwind
kingofthetailwind Posts: 575
edited March 2013 in Workshop
My Triban 3 developed a creaking sound coming from the BB/cranks last time I was out. So I bought a 8mm hex wrench and a crank puller to see if I could spot any problems.

So I'm trying to remove the drive side crank. The bolt comes off fine. I've fitted the crank puller, fully tightened the bit you screw in, but when I turn the handle nothing happens once it gets tight. The crank won't come off and doesn't appear to loosen at all. I've put a fair amount of force into it but don't want to use any more in case I damage the threads.

Any idea what I'm doing wrong?

Comments

  • sungod
    sungod Posts: 16,885
    some cranks need an extra bit put on the end of the puller, or in the hole, otherwise the puller threads bottoms out before the end pushes on the axle - the crank puller i have came with one, it's just a metal plug

    that's not the greatest description, but it sounds like you need to fit that extra bit
    my bike - faster than god's and twice as shiny
  • desweller
    desweller Posts: 5,175
    Make sure that the thrust pad on the crank puller will clear the edges of the square hole in the crank.

    If it doesn't, as sungod says, you can put a stud or something else in the bolt hole to stand the thrust pad off the crank a little bit.

    If it does then it's either seized on (not impossible) or you're not winding enough load on.
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  • nicklouse
    nicklouse Posts: 50,675
    so what are the cranks?
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • desweller
    desweller Posts: 5,175
    nicklouse wrote:
    so what are the cranks?

    Usually Shimano 2300 aren't they? Square taper jobbies.
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  • onbike 1939
    onbike 1939 Posts: 708
    I'd guess that the wrong puller is being used.
  • nicklouse
    nicklouse Posts: 50,675
    DesWeller wrote:
    nicklouse wrote:
    so what are the cranks?

    Usually Shimano 2300 aren't they? Square taper jobbies.
    who knows?
    hence the question.

    but if the OP has got the correct tools for the cranks/BB then more force is just needed.
    "Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
    Parktools :?:SheldonBrown
  • crankycrank
    crankycrank Posts: 1,830
    Also try pouring some boiling water over the crank before trying to pull it off again.
  • The thrust pad clears the edges of the square hole. I've tried using a nut to lengthen the thrust pad and still no joy. Can't get any more force into it.

    The groupset is mostly 2300/Sora but the cranks are Prowheel Ounce. Square taper jobbie yes.

    I'm taking it up to Decathlon. I'll let them try with my tool and their own.

    Cheers for the replies.
  • The mechanic in the shop couldn't get my tool to work either. So I bought one of the ones he used - Var. Much better.

    He also replaced the BB for free, you can't fault Decathlon.