How To:

Replace Channel Balances

Before You Begin
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Channel balances — sometimes called “block and tackle” balances because they contain cords and pulleys — are square in shape. In addition to the cord and pulleys, they have a long spring, which can be seen from the open side of the “U” frame. 
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The depth of the balance may be either 3/8" or 5/8" (considered 1/2" in the trade). Riveted through the “U” frame, on both ends are nylon end pieces, which serve as guides.

Step 1. ﻿
Remove the sash stops located at the top of both jambs. It's the part that the sash contacts so that the sash cannot be raised any higher. The sash stops are usually pressed into the jambs and can be pried out.
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Close the sash (the part of the window that moves and holds the window glass) to expose the take-out clips. Open both clips to remove the sash. Raise the sash until the top guide engages take-out clip. Continue to raise the sash, 2 -3 inches more.
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Step 2. ﻿
Unlatch the sash and raise it to the uppermost position. The balance will disengage from the sash. 
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Move the sash to the right or left as far as possible, then carefully rotate the opposite side of the sash toward you to remove it. Afterward, carefully, set aside the sash.

Step 3.﻿
Near the top of the jamb there is a retainer, called a “take-out clip”. Make sure the “take-out clip” is  rotated away from the jamb. Hook the terminal clip into the square hole in the jamb. Then tilt the balance towards the center of the window and allow the spring to relax. Now the cord terminal can be disconnected.

Step 4.﻿
Insert balance into the channel, allowing it to connect under the take-out clip.
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Note: Look for a four (4) digit number stamped into the balance housing like 2820, 2830 or 2840. The first two digits represent the length of the metal portion of the housing minus 1". 
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The last two digits represent the weight of the window for which the balance was designed. Take these measurements into consideration when buying and replacing the balance.

Step 5.﻿
Position the right or left side of the sash into the jamb, 2-3 inches above the take-out clip and swing the opposite side into alignment with the frame. Lower the sash to engage the balances and on down to clear the take-out clips—this will automatically center the sash. Snap the take-out clips into the jamb to facilitate normal operation.

Your channel window balance is now replaced and your window is ready to be used.