How To Replace The Rollers On An Aluminium Sliding Patio Door 

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Paddy's DIY - How To Replace The Rollers On An Aluminium Sliding Patio Door
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The first thing to check before you replace the rollers, is that your existing rollers are rolling on the track. Sometimes the door can partially jump off the track if it gets a bang closed. This will stop the door from sliding.
Lift the door straight up, at the same time push in at the bottom of the door and, let it back down on the track. If it is still difficult to slide then you need to look at replacing the rollers.
So we can see here that this old aluminium door is not sliding at all any more and i'm goin to replace the rollers. First thing to do is lift the door off and out of the frame. Lift straight up and pull out at the bottom. This is a single glazed aluminium door and is very light. Double glazed doors will be very heavy, get someone with you to lift it with you.
I'm laying the door down on a set of foldable saw horses. If you don't have these lay the door down on some timber planks or cardboard to protect the door from getting scratched.
At the bottom of the door where the rollers are located look for plastic cover caps like this and remove them. Behind it you will see a screw that holds the bottom section of the door to the side, remove this screw and do the same on the other side. the other screw you will see is the roller height adjustment screw.
So i have the side closest to the camera removed already, now i'm removing the other side. When both screws are removed, tap down on the bottom section of the door with a mallet. If you don't have a mallet use a block of wood and a hammer to protect the glass from scratches.
So this is a close up i filmed on another door. If the rubber seal comes off push it back on to the glass.
Back to the original door, we can see two screws. These screws hold the rollers to the bottom section of the door. Remove both screws. Some manufacturers screw the rollers up from the bottom, so check out the rollers thoroughly, you might not need to remove the bottom section at all.
When the rollers have been removed give the channel a quick once over to remove any dirt or cobwebs.
I'm going to replace these single wheeled rollers with double or tandem rollers made by schlegel. I've been using these rollers for years and in my opinion are the best rollers you can get. There are two heights made by schlegel. A low version that goes between heights of 30mm to 40 mm and a high version that goes between 40mm and 50mm.
So this roller measures 45mm from the top to the bottom of the wheel. So i'm going to fit the high version
Next fit the roller over the hole in the bottom channel making sure the height adjustment screws point outwards. Screw the roller to the channel, making sure that the roller is straight, repeat the process for the other wheel.
Slide the bottom section back onto the glazing rubber and tap back up with a mallet or a block of wood and a hammer. Make sure the bottom section is at the same level as both sides. Refit and tighten the screws. Spray some lubricant on the rollers
This is a close up i filmed on another door.