Step-by-step fix
Step 1: Confirm the sash balance is the problem
- Unlock the window and raise the lower sash a few inches, then halfway, then most of the way up.
- Notice whether the sash slides down on its own, drops suddenly, tilts unevenly, or feels like one side has no support.
- Open the window and look along both side jambs for a loose balance, broken cord, detached shoe, or metal channel sitting out of place.
- If the sash is hard to move because of paint, dirt, or swollen wood or vinyl trim, clean the tracks and make sure the sash is not just binding.
If it works: The sash will not stay where you leave it, or one side has clearly lost support, which points to a failed sash balance.
If it doesn’t: If the sash stays up but rubs, sticks, or scrapes, focus on cleaning, lubrication, or sash alignment before replacing the balance.
Stop if:- The glass is cracked, the sash frame is broken, or the window jamb is loose or damaged.
- The window uses a balance style you cannot safely identify or access.
Step 2: Remove the sash and expose the old balance
- Put on gloves and clear the area below the window so the sash has a safe place to rest.
- Raise the lower sash a few inches and look for tilt latches, take-out clips, or another visible release method near the side jambs.
- Release the sash according to its hardware style, then tilt or lift it out carefully while supporting both sides.
- Set the sash on a protected surface and note how the balance connects to the jamb and to the sash or pivot bar.
If it works: The sash is out and you can clearly see the balance hardware on the side jamb.
If it doesn’t: If the sash will not release, look again for hidden tilt latches or take-out clips and avoid forcing the frame.
Stop if:- The sash feels too heavy to control safely by yourself.
- A spring-loaded balance is under obvious tension and you cannot release it without losing control of the hardware.
Step 3: Match the replacement balance before installing anything
- Remove the old balance from the jamb, keeping any screws, clips, and end fittings with it for comparison.
- Measure the metal or body length of the old balance, not the full travel distance of the sash.
- Read any stamp, weight code, or marking on the old balance and compare the end fittings and connection points.
- Make sure the replacement matches the balance type, length, strength rating, and left or right orientation if the design uses handed parts.
If it works: You have a replacement that matches the old balance closely enough to install with the same mounting points and hardware style.
If it doesn’t: If the new part does not match the old one in type, length, or end fittings, pause and reorder the correct balance instead of trying to adapt it.
Stop if:- The old balance has no readable markings and the replacement cannot be matched with confidence.
- The jamb hardware or balance shoe is broken in a way that the new balance alone will not fix.
Step 4: Install the new sash balance
- Attach the new balance in the same position and orientation as the old one, using the original screw holes or matching attachment points.
- If the balance hooks into a shoe or pivot point, seat it fully so it cannot slip loose when the sash moves.
- Repeat on the other side if you are replacing the pair, which is usually the better fix when both balances are the same age.
- Check that both balances sit straight in the jamb and that no cords, springs, or channels are twisted.
If it works: The new balance is secured in the jamb and the hardware is aligned the same way as the original setup.
If it doesn’t: If the balance will not sit flat or line up with the sash connection point, remove it and recheck the part match and orientation.
Stop if:- A mounting point is stripped, cracked, or pulling out of the jamb.
- The balance cannot be secured without bending hardware or forcing the jamb.
Step 5: Reinstall the sash and reconnect it to the balances
- Lift the sash back into the opening and reconnect each side to the balance hardware or pivot bars evenly.
- Tilt or lower the sash back into its normal operating position and make sure both sides engage at the same height.
- Run the sash up and down slowly a few times to help the new balances settle into place.
- Lock and unlock the window once to confirm the sash is seated correctly in the frame.
If it works: The sash moves through its full travel without one side lagging, jumping, or dropping.
If it doesn’t: If one side binds or the sash sits crooked, remove it again and check that both sides are connected fully and at matching positions.
Stop if:- The sash will not seat back into the frame securely.
- The sash twists enough that the glass or frame looks stressed.
Step 6: Test the repair in real use
- Open the window to several positions, including a few inches, halfway, and near the top, and let go carefully each time.
- Confirm the sash stays where you leave it instead of drifting down or springing upward.
- Listen for scraping, clicking, or popping that could mean a balance is misaligned or not fully engaged.
- Use the window normally for a day or two and recheck that it still moves smoothly and holds position.
If it works: The sash opens smoothly, stays in place at different heights, and feels evenly supported on both sides.
If it doesn’t: If the sash still drops, the replacement may be the wrong strength or another balance-related part such as the shoe or pivot connection may also need repair.
Stop if:- The sash drops suddenly after installation.
- The window becomes harder to operate or the frame starts shifting during use.
Replacement Parts
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FAQ
Should I replace one sash balance or both?
If both balances are the same age, replacing the pair is usually the better repair. A new balance on one side and a worn balance on the other can leave the sash uneven.
How do I know which replacement balance to buy?
Match the balance type, body length, end fittings, and any weight or strength stamp on the old part. If those do not match, the sash may not stay where you leave it.
Why does my window still drop after I replaced the balance?
The most common causes are the wrong balance strength, the wrong balance type, or a damaged shoe or pivot connection that was missed during the repair.
Can I lubricate a sash balance instead of replacing it?
Cleaning the tracks can help a sticky window, but a balance that has lost tension, broken internally, or detached usually needs replacement rather than lubrication.
Is this repair safe for a homeowner?
Usually yes, if you can remove and control the sash safely and the balance style is clear. Stop if the sash is too heavy, the hardware is under uncontrolled spring tension, or the frame is damaged.