Help!!!!! Can any one give me tips on removing a crank from my MTB. the problem i've got is that, my old school MTb seems to have an unconventional setup. The first thing i did was remove the plastic cover on the crank which reveals what looks like a nut/bolt, after looking through a how to manual for MTB's, it mentions that if i unscrew the nut, i should find that a whole bolt should unscrew from the crank......BUT it doesn't, the nut comes off cleanliy but leaves a threaded bolt in place. I haven't damaged the bolt or the nut as as both look fine and look like two seperate bits. I'm kind of thinking that i probabley need a tool for the job, but has anyone got a clue as to what this setup is called, and what tool i'd need to rectify!!!!!! Any ideas would be appreciated.
Help!!!!! Can any one give me tips on removing a crank from my MTB. the problem i've got is that, my old school MTb seems to have an unconventional setup. The first thing i did was remove the plastic cover on the crank which reveals what looks like a nut/bolt, after looking through a how to manual for MTB's, it mentions that if i unscrew the nut, i should find that a whole bolt should unscrew from the crank......BUT it doesn't, the nut comes off cleanliy but leaves a threaded bolt in place. I haven't damaged the bolt or the nut as as both look fine and look like two seperate bits. I'm kind of thinking that i probabley need a tool for the job, but has anyone got a clue as to what this setup is called, and what tool i'd need to rectify!!!!!! Any ideas would be appreciated.
Cheers
D
Hi,
You need a "crank puller"...available at any LBS for around $15.00.
There are 3 types of bottom bracket spindles (that part onto which crankarms are mounted)....square spindle with threaded stud, square spindle that uses a bolt, and splined pipe billet. Get a crank puller that is designed for use with square spindles...screw in the portion that threads into the crank arm, turn the handle clockwise and it will "pull" the crank arm off.
Help!!!!! Can any one give me tips on removing a crank from my MTB. the problem i've got is that, my old school MTb seems to have an unconventional setup. The first thing i did was remove the plastic cover on the crank which reveals what looks like a nut/bolt, after looking through a how to manual for MTB's, it mentions that if i unscrew the nut, i should find that a whole bolt should unscrew from the crank......BUT it doesn't, the nut comes off cleanliy but leaves a threaded bolt in place. I haven't damaged the bolt or the nut as as both look fine and look like two seperate bits. I'm kind of thinking that i probabley need a tool for the job, but has anyone got a clue as to what this setup is called, and what tool i'd need to rectify!!!!!! Any ideas would be appreciated.
I am familiar with the kind of bottom bracket you are talking about. My guess is that you have also tried the other side and found a similar situation. What I am going to tell you worked for me, when I was helping a friend with this but it is neither easy nor entirely fool proof, (though presumably after your frustration you will pitch this bottom bracket and get an inexpensive aftermarket Shimano with proper crank bolts ;-) Besides, these bottom brackets in their best days were heavy sloppy junk.
Loosen the nut all the way flush with the top of the threaded stud (hopefully your puller allows that nut to stay in place when you secure it into the crank arm- some of those nuts have an integrated washer and that won't work). Leaving the nut on isn't necessarily required but you will likely deform the stud threads when you drive the remover on top of the stud, which you obviously thought about in your post. With the nut there, it helps preserve the stud integrity. Pull the arm loose. You can then remove the puller, the nut and washer and the arm should simply lift off. If your nut is too large for the puller to go around, perhaps you can find a smaller nut or non-integrated nut/washer, with the same threads at ACE Hardware or similar.
Hope this helps!
John Everett said:
dave1975 said:
Help!!!!! Can any one give me tips on removing a crank from my MTB. the problem i've got is that, my old school MTb seems to have an unconventional setup. The first thing i did was remove the plastic cover on the crank which reveals what looks like a nut/bolt, after looking through a how to manual for MTB's, it mentions that if i unscrew the nut, i should find that a whole bolt should unscrew from the crank......BUT it doesn't, the nut comes off cleanliy but leaves a threaded bolt in place. I haven't damaged the bolt or the nut as as both look fine and look like two seperate bits. I'm kind of thinking that i probabley need a tool for the job, but has anyone got a clue as to what this setup is called, and what tool i'd need to rectify!!!!!! Any ideas would be appreciated.
