SWISCO - The Replacement Hardware Authority

Hinge and operator for casement window

A home owner from Lahaina, HI says:
I have four casement windows, and I need to replace all of the hinges and operators. I think they are about 20 years old.

There are no numbers on the hinge.

On the operator, the long arm says "Truth Entryguard 40755" on it, the short arm says "31540", and the link connected to it says "20812". The operator itself has "45179".
User submitted a photo of a window operator.
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Paul from SWISCO responded:
Your hinge looks like our 36-021HD, and the operator looks like our 39-031. If you also want to replace that stud bracket, see our 39-508. Please review this hardware and see what you think!
A home owner from Lahaina, HI says:
The pair of 36-021HD hinges I ordered on Monday just arrived. (Thanks for the fast shipping!)

The hinges are very stiff; it takes a big effort to make them move. Is there a trick to making them move freely?

I checked the set screws, and they are nice and loose.
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Dave from SWISCO responded:
Try some oil on the joints and work the hinges, that should loosen them.
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