[ITEM 2] QUESTION: Windows and doors: how to adjust hinges and locks so they don't catch?

Adjusting the hinges and locks of plastic or wooden windows and doors is a basic technical procedure that allows you to eliminate the sash catching on the frame and restore the smooth movement of the hardware. Over time, under the influence of their own weight and thermal deformations, the sashes sag, shift horizontally or vertically, which leads to friction and tight closing. Using a checklist and sequentially performing repair operations will help quickly return the structure to an ideal working condition.

Before starting the adjustment, it is necessary to diagnose the nature of the shift. If the sash catches the frame from the bottom on the handle side, it means it has sagged on the hinges and needs to be lifted. If the catching occurs on the side in the middle part of the profile, the sash needs to be shifted horizontally towards the hinge zone. To carry out the work, you will need hexagon keys (usually 4 mm in size), a Phillips screwdriver, and machine oil for lubricating moving parts.

Below is a step-by-step instruction for adjusting the lower window hinge to eliminate sagging:

To adjust the horizontal position of the sash, use the screw on the side of the hinge, which moves the corner left or right. If it is necessary to adjust the pressure of the sash against the frame, you need to adjust the eccentrics (trunnions) located along the entire perimeter of the sash. Turning the eccentrics with a key or pliers allows you to increase or decrease the pressure, providing protection against blowing in summer and winter. Regular lubrication of all fastening points will extend the service life of the mechanisms for years to come.