Casement windows use cranks that allow you to open or close the window. These cranks are strong hardware pieces, but they can wear out over time. If you have a broken crank handle on your casement window, you can replace it on your own, or you can hire someone to fix it for you. 

Remove the Handle 

First, you need to remove the handle. To do that, you are going to need to use a screwdriver to remove the small attachment screw that is located at the base of the handle. Once you remove this little screw and set it somewhere safe, you should be able to pull the handle off.  

The handle is attached to the crank stud. Check the teeth inside the handle, and see if they are worn out. If the teeth inside the handle are worn out, then the handle needs to be replaced. If the spline beneath the handle is worn out, that means that you are going to need to change out the entire crank.  

Remove the Crank Stud 

To remove the crank stud, you are going to need to take a pair of pliers and twist the crank stud so that you can open your window. You are going to want to extend the arm of the window all the way out so that the window is fully open.  

Once the window is open all the way and the arm is extended, you need to take the arm and pull out the bushings. This will allow you to slide the arm out of its holder. 

Remove the Crank 

Then, you need to remove the screws that are securing the casement cover in place. There should be a few mounting screws on top of the crack that you will have to loosen in order to remove the crank.  

Position the New Crank 

Now that you have removed the crank, it is time to get the new one in place. Take the new crank, and put it in place so that it lines up with the screw holes on the window frame. You want to avoid drilling new screw holes if possible. You can stick a toothpick through the crank into the screw holes to hold the crank in place. Take one toothpick out at a time, replacing them with screws. Push the arm back into place, and then re-attach the handle and put the set screw back in place.  

Check the Setup 

Finally, check the setup, and make sure that the window opens and closes properly.  

If your crank window handle is not working correctly, you may be able to easily fix it up. If this does not work, you may want to hire a window replacement service to come install a new window.