I have removed all of the nuts and bolts and all that is left is the crank itself. both of the crank arms just spin inside the bike frame. no matter what I do the crank will not come loose. Is there something that i am doing wrong, or is there a special tool made just for this purpose.
Re: I am trying to remove the crank form a bicycle
You just need a bicycle crank remover they are cheap. but if you don't want the old one. just get a can of wd40 and spray leave to soak in then acquire two screwdrivers and put them round crank arm and knock them both with a hammer at the same time. (you may need two people) then should come off .
Re: I am trying to remove the crank form a bicycle
There are different types of cranks and attachment methods. You probably have what's called a "4-sided taper" which means the attachment has 4 faces (like a bolt and socket with 4 instead of 6 sides) and when the crank is attaches, the bolt literally squeezes the crank onto the axle.
Yes, it takes a special tool.
You can buy one here: http://www.benscycle.net/index.php?main_page=product_info&products_id=796¤cy=USD (This is *probably* the right tool, but without knowing the type of crank you have, it may not be!)
But it's probably cheaper to take it to a shop unless you're going to keep using the tool.
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It's very difficult to find someone familiar with a particular model of a particular brand of exercise bike, but I pulled up some pics that seem to show that yours can have one of two types of crank. One is called a "one-piece" crank. Typically it is removed by unscrewing parts from the left side after removing the left pedal (left-hand/reverse threads). You may have to remove the housing to access and remove the parts. The other is a 3-piece cranks, and the arm will have a plastic cover at the axle. If you remove that dust cap you will see a bolt underneath. One has to remove that bolt and then use a specialized tool (crank extractor) to remove the crank arm. Check with a bike shop (take in the unit or take some good pics) for replacement.
It is according to what your crank design is.
1st. design. This is a solid crank. Look at your crank. One side will have a nut, and a race with slots in it. If this is yours then you take off the pedal on the side of the nut. Now take off the nut, use a screwdriver to remove the race. Pull that bearing out, then push the crank through the opening, removing the other bearing. If you have a multiple speed bike you have to remove the sprockets first.
2nd design. After removing the sprockets there is a bolt holding the crank arms on the shaft that the bearing are on. Remove the cranks and then remove the bearings the same as above.
If I remember right the threads on the pedals are left handed, which means you turn in opposite direction than normal. then you unscrew the nut on the crank. The race for the bearings will have a slot. Use a screwdriver to turn it the normal way. Take out that bearing. Then move crank a little way to the other side to get bearing out from the inside race. Then you should be able to pull crank through.
On the newer bikes, the crank can be dismantled on each side so all you have is a shaft to remove. You still remove the race and bearings the same way.
Usually takes special tools. The pedals should be removed, the crankset is either a single arm or a 3 piece unit. If its a single, remove large nut on one side of the crank, usually the left side. Then remove the inside cone, the bearings are visible and should be removed. The last is the crankarm itself. It will only come out if thew left side bear is removed. Twist it gently and it usually comes out at the 3 o'clock position.
If its a 3 piece crankset, special tools are need to remove. SAuggest you take it to the nearest bike shop.
You need a puller, because the bottom bracket shaft (the crank shaft) and the crank arm are a tapered fit which is still tight after you remove the bolt (or in some cases a nut). There are a couple on this site:
You need a crank puller. In the centre of the crank, there should be a nut or a cover of sorts, pop the cover off with a screwdriver or other flat tool and then unscrew the nut with a ratchet set or, if you have it the proper bike tool. then use the the crank puller, to pop off the crank. Also, odds are the wrattling sound is your bottom bracket and not the crank. Good luck.
Yes, the crank-arm could be replaced.
1.You would need to remove the flat nut holding the crank to the frame. And then take out the bearing.
2. A special open-ended wrench is required to remove this nut. Please visit your local bicycle shop for a new crank-arm, and the required tools, also.
3. Put in new crank-arm and its bearing.
4. Grease the bearing.
5. Tighten nut.
6. Give it a test ride.
Diagrams are available in the website under the support tab. Just note the you have to remove the crank on the right side to get to the nut that holds the lower eyelet into the frame (torque nut (not the bolt) to 120in/lbs with a torque wrench.... yes you have to use the torque wrench.... Push the bottm bolt in first then the top one then tighten both to 120in/lbs. The brain hose should bend under the main pivot nut and then inside the rear triangle and brake hose. Torque the bolts to 70in/lbs. Go ride!
You will need to purchase a crank puller. If you only have to do this once you are better off having it repaired in a bike shop unless you like to have tools for everything. They come in various sizes so you will have to tell the dealer which one you need and for what bike. It works like a gear puller. You remove the cap covering the bolt. You remove the bolt or nut holding the crank on and screw the puller into the threads on the crank. You then tighten the bolt that goes through the center of the puller. It puts pressure on the bolt in the center of the crank and forces the crank off. Hope this helps.