Windows won't close

A quick learner says:
I have several pella casement windowsinstalled in New home built in 1989. Most are hanging out of plum while the frames have stayed plum. Lifting up and down while open you can see the white guide at the top is sloppy. Bottom guide stays intake with little movement. The support hindge measures 11 and a half inches end to end. Could I just need part number 39-363 or would I need a new hinge assembly. If so what is the part number.
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Dave Sr. from SWISCO responded:


We can't be positive without being there to troubleshoot the problem but I agree that it would be worth trying to replace just the 39-363 guide. That might be all you need to fix your windows. If you determine that the hinges need to be replaced as well, take a look at the 10" and 12-1/8" replacement options related on this page to determine if one of them could work for your repair. Thank you. 

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