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Casement window mechanism - think it is Pella

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Home Owner from 06078
Jul 20, 2026 4:27 pm
I will likely need both left and right versions 
I am fairly handy and watch a video so I know I would need to remove trim to change.
Have several windows that will need replacement - some are double (side by side) some are single.
They are also different sizes but style looks the same - would they all take the same one?
Is there some place on the origional where I could find numbers? Could see any when just looking at it through window. 
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Bob
Bob from SWISCO
Jul 25, 2026 4:48 pm
SWISCO
Expert

Hello there. Numbers and old codes typically aren't helpful. The dimensions and design matter most. See if the 39-175 Pella operator matches what you have (the opposite-handed version is the 39-176). For a new T handle see the 39-227B.

Dimensions for 39-175
Dimensions for 39-175

Home Owner from 06078
Aug 9, 2026 1:31 pm
Thank you - this is helpful.
I took measurements today based upon the 39-175
The piece that attaches to actual window is fine2" in between the first 2 screw attachments, 3-3/8" between next 2 screwsThe next "connector" arm is 5" between pivot pointsThe issue I have is that the crank arm itself (that the gear moves) appears to only be 5" NOT 6"See pictures
 
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Bob
Bob from SWISCO
Aug 14, 2026 12:43 am
SWISCO
Expert

It's tough to say for sure so long as the operator is still installed. Either way, based on visual ID I think the 39-175 is our best possible match. If you do choose to try and it and it ends up not working, see our Return Policy here.

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