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Step-by-Step Instructions and Pictures: How to Replace A Casement Window Crank Operator

Install a new crank mechanism for a stubborn casement window. Read an overview for how to replace a casement window crank operator.

By the experts at The Family Handyman

From The Family Handyman

Replacing a Casement Window Crank Operator

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1. Inspect the old crank for wear. Worn and missing splines on the crank stud, stripped or broken gears, and worn-out crank arms mean you have to replace the entire crank operator.

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2. Open the window until the crank arm guide bushing aligns with the notch in the guide track (use a locking pliers for a crank handle and push out on the window to help it open). Press down on the arm to free the bushing from the track, and then push out the window until the bushing clears the track.

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3. Back out the trim screws and lift the casement cover off the window jamb. Remove all crank mounting screws and lift off the crank. Replace rusted or bent trim screws.

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4. Compare the new operator with the old to make sure they match.

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5. Line up the new crank with the old holes. The old screw holes are often stripped. If so, stick a toothpick or two in them as filler and drive the screws. Then reattach the crank arm and casement cover.

Comments :

By Joan Marion, 10/05/2009, 1:58 PM EDT

The new crank cost us $150 with tax. Be sure to estimate costs before you begin.

By Dave, 09/06/2009, 1:40 PM EDT

Can you tell me how to fix if the guide on the top and bottom of the windows have come out of the track that is mounted to the sill? There doesn't appear to be damage to either. The riveted link keeps you from realigning the pieces, so I am tempted to unscrew the metal reinforcement from the sill, but am concerned that the riveted link will still keep you from getting them realigned. Please advise. Thanks.