Step-by-step fix
Step 1: Confirm the balance is the real problem
- Open the window a few inches and let go carefully while keeping one hand ready to catch it.
- Watch for common balance failure signs: the sash drops shut, will not stay where you leave it, feels much heavier than normal, or sits crooked when moving.
- Look along both side jambs for a loose, broken, or disconnected balance, cord, shoe, or spring.
- Compare both sides. If one side has obvious damage and the other looks intact, the balance is a strong suspect.
- If possible, remove the sash enough to read the stamp or markings on the old balance before ordering parts.
If it works: The window behavior and visible hardware point to a failed window balance, and you have enough information to match the replacement.
If it doesn’t: If the window is binding in the track, painted shut, or rubbing because the frame is out of square, fix that issue first before replacing the balance.
Stop if:- The glass is cracked or the sash frame is loose enough that handling it could cause it to fall apart.
- The window frame, jamb liner, or balance mounting area is badly damaged or rotted.
- You cannot identify the balance type well enough to order a safe match.
Step 2: Set up the area and remove the sash
- Clear the floor and window sill so you have room to support the sash with both hands.
- Put on gloves and unlock the window.
- For a typical tilt-in sash, raise it a few inches, press the tilt latches, and tilt the top of the sash inward toward you.
- Lift one pivot side free, then the other, and set the sash on a protected surface.
- If your sash does not tilt in, remove any stops or retainers carefully and keep screws and clips together in order.
If it works: The sash is out of the opening and you can reach the balance hardware safely.
If it doesn’t: If the sash will not release, look again for hidden take-out clips, stops, or tilt latches rather than forcing it.
Stop if:- The sash feels too heavy or unstable for one person to control safely.
- A spring-loaded part is under obvious tension and you are not able to release it in a controlled way.
Step 3: Match and remove the old balance
- Take a photo of the old balance before removing it so you can copy the orientation during reassembly.
- Measure the metal or body length of the old balance, not the full travel of the spring or cord.
- Read any stamp, weight code, or printed marking on the old part.
- Note the balance style, such as channel, spiral, or block-and-tackle style, and compare the top and bottom attachments.
- Remove the screws, clips, or hooks holding the old balance in place, and keep any reusable fasteners.
- If replacing only one side, compare the old part to the opposite side to make sure the new one matches the setup.
If it works: The old balance is out, and you know the type, length, and rating needed for the replacement.
If it doesn’t: If the new part does not match the old one exactly enough to mount and connect the same way, pause and exchange it for the correct balance.
Stop if:- The balance shoe, pivot bar, or jamb liner is broken in a way that will keep a new balance from working.
- The mounting holes are torn out or the frame material is too damaged to hold the replacement securely.
Step 4: Install the new window balance
- Place the new balance in the same side and orientation as the old one.
- Attach the top and bottom fasteners or hooks the same way the original balance was secured.
- If the system uses a shoe or pivot connection, make sure the connection is fully seated and aligned in the track.
- Repeat on the other side if both balances are being replaced. Replacing both sides often gives smoother, more even operation.
- Check that both sides sit at the same relative height and that cords, springs, or channels are not twisted or rubbing.
If it works: The new balance is mounted securely and the hardware on both sides is aligned.
If it doesn’t: If the balance will not sit flat, line up with the shoe, or accept the sash connection, remove it and compare every attachment point to the old part again.
Stop if:- The replacement requires forcing, drilling new holes in a questionable location, or bending the frame to fit.
- A spring, cord, or shoe jumps out of the track and cannot be reset securely.
Step 5: Reinstall the sash and reconnect it to the balances
- Lift the sash back into position and reconnect each side to the balance hardware or pivot shoes.
- For a tilt sash, insert one pivot bar, then the other, and rotate the sash upright into the side tracks.
- Lower and raise the sash slowly by hand to make sure both sides engage evenly.
- Reinstall any stops, clips, or retainers you removed earlier.
- Lock and unlock the window once to confirm the sash is sitting correctly in the frame.
If it works: The sash is back in place, moves in the tracks, and stays engaged with the new balance.
If it doesn’t: If one side lags, pops loose, or sits lower than the other, remove the sash again and recheck the balance connection and shoe position.
Stop if:- The sash will not stay captured in the tracks or feels like it could fall out.
- The window binds hard enough that continued testing could damage the new balance or the sash.
Step 6: Test the repair in real use
- Open the window to several positions, including a few inches, halfway, and near the top of its normal travel.
- Let go carefully each time to see whether the sash stays where you leave it instead of drifting down or shooting upward.
- Close and reopen the window several times to check for smooth, even movement and similar resistance on both sides.
- Listen for scraping, clicking, or spring noise that suggests a misaligned shoe or twisted balance.
- Check that the window closes fully and locks without needing to force the sash into place.
If it works: The window opens smoothly, stays where you leave it, and closes and locks normally.
If it doesn’t: If the sash still drops, rises on its own, or moves unevenly, recheck the balance rating, side-to-side installation, and sash connection points. If those are correct, the wrong balance type or a damaged shoe may still be the issue.
Stop if:- The sash still will not stay open after correct installation of a matching balance.
- The frame or sash shows movement, cracking, or other damage beyond the balance itself.
Replacement Parts
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FAQ
Should I replace one window balance or both?
If one balance has failed, the other is often not far behind. Replacing both sides usually gives smoother operation and keeps the sash supported evenly.
How do I know which replacement balance to buy?
Match the balance type, body length, end attachments, and any weight or strength stamp on the old part. A close-looking part that has the wrong rating may still fail to hold the sash correctly.
Why does the window still fall after I replaced the balance?
The most common causes are the wrong balance rating, the wrong balance type, a disconnected pivot bar or shoe, or damage in the track that keeps the hardware from engaging properly.
Can I replace a window balance without removing the sash?
Usually no. Most balance replacements require at least partial sash removal so you can reach the side hardware and reconnect the sash correctly.
What if the old balance has no readable markings?
Use the old part's style, length, end fittings, and the sash size and weight as your guide. If you still cannot match it confidently, take the old balance to a local window parts supplier before ordering.