Marvin window balance

Question

Hello,
I need to replace a channel balance on an old Marvin window that is about 20yrs old. It is the inside window. The left side balance has 14HD stamped on it and is 15" long , but the right side has (upsidedown U) 14xhd. The balance shoe(blue plastic) was broken and is still in track but looks like a 751. Do you think a 751 would be the correct balance and what does the xhd mean?
Also, the track on top where the clip hangs on is a little chipped to the point where the balance will probably clip about 1/4" lower. Is that an issue?
I didn't remove the sash to inspect for more damage but is there any other parts that usually need to be replaced?
Thank you,
John

Paul · Accepted Answer

As long as the metal channel and shoe are the same style as the Series 751 I think it can still work. The color of the shoe doesn't matter so much in this instance. As for the stamp, I wouldn't worry about the "x." What's important is "14 HD." That is the option I recommend selecting for the S751-15 channel balance.