CertainTeed Window Swing Arm Gear Mechanism

Thanks for writing in. I think we can replace this operator for you, but we'll need to see it out of the window in its entirety, including the link arm(s). From there, we'll do our best to find a replacement. Many thanks.

Thanks for getting back to me! I should have clarified in my initial response: when that worm gear piece falls out of the operator, as displayed in your first photo, this means that the entire mechanism has worn down and has to be replaced. Fortunately, it looks like we can identify this. See either our 39-031 and 39-032, or our 39-155 and 39-156. These operators are very similar, with just slight differences in the dimensions of the link arms. Look over both sets and let me know if one of these is what you're looking for.

Sure! If the link arm of the replacement operator doesn't match the size of the link arm on your old operator, then you may not be able to close the window. It will stop at a certain point because there is simply not enough play to tug it close that last inch or so. It's very important to measure your old link arm to be sure that the replacement is the same size. We have detailed dimensions on each part's store page that you can use as a reference.

No. One of the two pairs Bob mentioned will work, but since we don't know your dimensions there's no way for us to know which one it is. It's only going to be one or the other, which is why Bob asked you to look them over to confirm which set matches your dimensions. 

He was only able to narrow it down to those two pairs. You'll have to take it from there and determine which one is the better match.