How to adjust a tilt-and-turn window that drags or won't lock

Step 1: Find out what's actually wrong

Close the window slowly and watch.

• Rubs at the bottom on the handle side, or you have to lift it to close → the sash has dropped. Fix: raise it at the bottom hinge.
• Rubs along the hinge side or the handle side → it's shifted sideways. Fix: side adjustment.
• Closes freely but the handle is stiff → cams too tight, or not lining up with the keeps, or dry hardware.
• Handle turns easily but there's a draft → cams too loose, or a worn gasket.
• Hanging from one corner → misoperation. Fix that first (Step 3).

Tip: look at the gap between sash and frame on all four sides. It should be even. A paper test helps: close the window on a strip of paper at several spots and pull. Where it slides out easily, the seal is light.

Step 2: Tools

• 4 mm hex (Allen) key; on some hardware, a T15 or T20 Torx
• Flat pliers (for some cams)
• Light machine oil or resin-free hardware grease
• A helper for big sashes

Step 3: If the sash is hanging from one corner

Support the sash. Press it back flat against the frame as if closing it in the turn position. Near the handle, on the sash edge, there's usually a small spring lever or button (the misoperation lock); press it. Holding the sash closed, move the handle to the horizontal (turn) position, then down to closed. Test. If the top arm looks bent, stop. Full steps

Step 4: Lubricate before you adjust

A dry window feels misadjusted. Put a drop of oil on each locking cam, on the bottom hinge and on the top stay arm. Work the handle through all positions five or six times. Test again. Sometimes this is all it needed.

Step 5: Raise a dropped sash (bottom hinge, height)

On most hardware, the bottom corner hinge has a vertical adjustment screw reached from the top of the hinge with the sash open, sometimes under a snap-on cover. Turning it raises or lowers the sash, typically by a couple of millimeters in total range.

1. Open the sash in turn. Support it.
2. Remove the hinge cover if fitted.
3. Turn the height screw a quarter turn (direction is marked on many hinges; if not, try one way and check).
4. Close and check the gap at the bottom on the handle side.
5. Repeat until it clears the frame evenly.

Step 6: Center the sash (side adjustment)

• Bottom of the sash: a horizontal screw in the bottom hinge moves the bottom of the sash toward or away from the hinge side.
• Top of the sash: a screw on the top stay arm (visible with the sash open in turn) moves the top of the sash sideways.

Adjust the top and bottom together to move the whole sash, or one only to correct a sash that's out of square (rubbing at one corner). Quarter turns, test each time.

Step 7: Set seal pressure (locking cams)

Look along the sash edge for round or oval cams (sometimes called mushroom cams or rollers). Many are eccentric: turning them with a 4 mm hex key or pliers moves the cam's center, changing how firmly the sash is pulled in. Some show a mark or line: toward the room = tighter, toward outside = lighter, or the other way round depending on maker.

• Draft or whistle on one side → tighten the cams on that side a little.
• Stiff handle with no draft → loosen them a little.

Keep cams on the same side at the same setting.

Step 8: Check the keeps

If a cam doesn't catch its keep at all, the keep may be loose or the sash too low. Tighten keep screws; re-check height.

Callout (unattributed): "A quarter turn, close it, check. Then another quarter turn. Patience beats force every time."

When to stop and call a technician

• The sash dropped again soon after adjusting (worn hinge bearing).
• The handle spins freely or jams (gearbox).
• The top stay arm is bent.
• Glass is cracked or fogged.
• The frame is damaged or the window was never installed square.
• You can't find screws that match these descriptions.

We adjust and repair European tilt-and-turn windows from any supplier around Seattle: request service.

Related: Tilt-and-turn window adjustment service · European window hardware repair