balance replacement

Question

Hi,
We have 14 PGT single hung windows that all have some problem. Some with broken top sashes and run-away balances and some with stuck balances. Before diving into a repair I would like to have replacement parts on hand. I am not confident in selecting the correct parts and would like your help. Here is what I know:
PGT
I think they are series 4000 as per the attached picture.
single hung
One of the run-away balances has the number 3520 stamped on it

I will need balances and top sashes.

I think your replacement parts are:
S350-20 and 18-110

Thanks in advance.

Regards,
David

User submitted a photo of window hardware.

Paul · Accepted Answer

Thanks for contacting us. I'm afraid I cannot identify what you have based on that sticker alone. I can say that PGT windows have been known to use our Series 395 balance and 18-015 top sash guide, but considering that these differ from the parts you picked out I think it would be best if you were to show us a few pictures of your hardware. Please make sure we can clearly see both ends of the balance. Please also provide measurements for all your hardware, especially the top sash guide.