Bi-fold doors are excellent additions in your home, as their design allows you to open up large areas in your home that would otherwise only get the light an ordinary door had to offer. In order for your bi-fold doors to function without problems, it's sometimes necessary that they get repaired. These repairs are rarely very complicated, and if you are somewhat comfortable around tools, there shouldn't be too much trouble for you to do them yourself. In order for you to be able to repair bi-fold doors properly, there are a few things you should think about.
Difficulty to open or close
One of the most common malfunctions with bi-fold doors is that they get stuck when you attempt to open or close them. The most probable reason for this is that the top bracket has become crooked or loose. Open the doors as much as you can and then slightly unscrew the screws holding the top bracket in place. Pull the bracket into place and make sure it's aligned with the door frame. Then tighten the screws again. If the bracket is crooked because the wood in the door frame is crooked, you might also need to drill new holes for the screws, as the wood has moved. In that case, you need to remove the door and the bracket completely and reinstall them fully.
Another common malfunction with bi-fold doors is the doors feeling wobbly as you move them. This might be because of a loose pivot pin, as this is the item that attaches the door to the brackets. Remove the doors and pull both the top and the bottom pin out for examination. If the pin seems worn or rusty, you need to replace it. If that's not the case, then you need to take a look at the pinhole. The reason might be that the hole has widened, allowing the pin to come loose. If the hole has widened, you need to fill it and then drill a smaller hole to give the pin a snug fit.
Your door might also feel slow to open. This might depend on the hinges connecting the two doors on each side. Start off with lubricating the hinges, as they might just have become rusty or worn. If that doesn't help, then you need to unscrew the screws sticking the hinges to the doors and replace the hinges. Just be careful, as this can cause the inner door to become loose. Have someone to help you hold it while you replace the hinges.