If your window crank handle just spins when it’s turned, or it can’t pull in the sash far enough to engage the lock, chances are the gears are stripped and it’s time for a new crank mechanism. Replacing the crank mechanism is simple. But finding a new crank may take some time. You can mail your old crank to some replacement hardware specialists and you’ll get back a match (Photo 1). The cranks can be expensive, but they may be a bargain if the overall condition of the window is still good.
Start by inspecting the old crank operator and handle for wear. If the teeth are missing inside the crank handle, simply replace it (at home centers and full-service hardware stores). But if the operator has broken or worn parts (Photo 1), replace the entire operator mechanism.
The first step is to disconnect the crank arm from the guide track. Take out the screen and crank the window open until the plastic guide bushing aligns with the guide track notch (Photo 2).
Next, look for trim mounting screws inside the screen track. Unscrew them to remove the casement cover and access the crank innards (Photo 4). If there aren’t any trim screws, the casement cover is probably nailed or stapled in place. Slide a stiff putty knife between the window jamb and casement cover. Carefully pry up the casing so you don’t damage the wood parts.
Close the window and lock it until the new crank arrives. Compare the new operator with the old, making sure they match. Install the new crank as shown in Photo 5.
If your window crank handle just spins when it’s turned, or it can’t pull in the sash far enough to engage the lock, chances are the gears are stripped and it’s time for a new crank mechanism. Replacing the crank mechanism is simple. But finding a new crank may take some time. You can mail your old crank to some replacement hardware specialists and you’ll get back a match (Photo 1). The cranks can be expensive, but they may be a bargain if the overall condition of the window is still good.
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