Channel balance won't allow window to slide freely

Question

Aloha, Replaced the channel balances in my tilt vinyl windows with your series 770 "35B" and "29C" balances. First tried the 15-129 pivot shoe which does not slide with the 4 notches making it slightly thicker. Tried the 15-046 pivot shoes which seems to fit in the window. Everything appears to work correctly without the window sash put it but once I put the window sash in, extremely hard to move window up or down. Please advise. Thanks, Alex

Paul · Accepted Answer

Hello,

I'd recommend spraying silicone along the window tracks for the pivot shoe to slide easily. Using our 15-046 pivot shoe, did the pivot bar go in fine and turn the center cam? If so, the other problem might be the spring weight. The 35B is for a sash weighing between 16-22 lbs. and 29C is for a sash weighing between 18-23 lbs. Check your sash weights and let us know if you need further assistance. Thank you!