Balancer for Marvin windows

Hello,

Your balance reminds me of the S751-25 with a 24HD strength option at first glance but we would need to see it removed to confirm. There are other versions of this balance with a different shoe than the 15-014 that comes with our stock balance, so it's important to remove the balance entirely. Thank you!

Marvin customers have successfully replaced their tilt ribbed balances with our Series 751. The Series 751 comes with a 15-014 locking terminal at the end of the cord. You would need the S751-25 with a 24HD strength option for a sash weighing between 18-22 lbs. 

To replace them, you will raise the bottom sash up about six inches, tilt the sash in and twist it to release the pivot bars from the terminal clips. Now, carefully remove the vinyl jambs from the window wood frame. They are held in by the pressure of the sashes when they're installed. Lay the jamb liner down and slide up the broken balance from the vinyl track. Remove the "S" clip from the balance and install it on the new balance. 

Then, slide the new balance down the track, keeping the 15-014 terminal clip from catching inside the track. Hook the "S" clip on the track and pull down the 15-014 terminal clip about six inches from the balance and lock it in place. After you replace all the broken balances re-install the jamb liners and sashes before testing that the window is functioning properly.