Hurd casement window mechanism failed

Thanks so much for contacting us. It definitely sounds like you need a new operator, if the gears are stripped.

Based on your photos here, you have either our 39-253RB or 39-439B, depending on the design of the guide at the end of the arm. The video below will clarify the difference. Watch this and pick accordingly.

Regardless of which operator you select, you'll also need the 39-452 cover/handle set.