How To Fix A Loose Crank Arm

Loosen the pinch bolts with an Allen key if the crank has them. Some older bicycle models may have a threaded dust cap and you can remove the dust cap with a.

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If its a splined shaft youre probably SOL And regularly re-tighten the bolt -- dont wait for it to get loose.

How to fix a loose crank arm. However these crank retaining rings are threaded over the crank bolt so that when the crank bolt is loosened the shoulder of the bolt presses back against the ring which in turn slowly pushes the arm from the spindle. Never grease the taper and inner portion of a crankarm. Remove the cap from the center of the crank if it has one.

When the crank arm is loose and you pedal with it you damage the four corners of its socket that rest in the axle. Best option is to wipe it completely clean the taper between the two needs a clean dry interface in order to maximize tightness and fit. Remove the crank handle control switch and other accessories if necessary.

Insert an Allen key into the crank. The non-drive side crank may stay put at least temporarily without a bolt through it but dont put pressure on it as you ride as this will loosen it quickly. The only fix to that is a new crank arm.

The protector cap covers the hex-head bolt that holds the crank arm to the crank and keeps the crank tight. If you found a piece of metal over the crank arm bolt which let you see the bolt but not remove it this is a self extracting bolt assembly. Self-extracting systems use threaded rings that look similar to a crank dust cap.

No additional crank removal tools are required. Take the bolt and the washer behind it from the non-drive side and use them to re-attach the drive side crank arm. Pry the plastic protector cap from the crank arm with a wide-bladed slotted screwdriver.

When the crank loosens the arm rocks back and forth slightly rounding out that square. It is dangerous to ride on a bike with loose crank arms so fixing wobbly crank arms is a very important thing to knowFollow the tips and instructions in the. You can try locktite but Ive had no success with that either.

Some cranks will have pinch bolts or 2 smaller. Those UN72s sure did crack replacing the plastic portion with steel one is a good thing to do provided you can find an old one at your LBS. Some cranks will have a metal or plastic cap that fits.

You will have no choice but to replace it. This means the BB spindle is square and the hole in the arm is also square. Removing the Crank 1.

Somehow this damage causes the crank arm to wiggle enough to unscrew the nut little by little until it just falls off again. Basically either the arm must be replaced and the shaft if the situation goes on for too long or if this is a square shaft you must carefully fashion a shim perhaps out of aluminum pop can material to create a better fit. Depending on the make and model of your car you may also need to remove a crank handle window control switch or any number of accessories including cupholders arm rests luggage bins and door handles.

You can tighten that bolt and everything feels fine until you start riding and putting pressure on the arm and it wiggles its way lose again.

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