Michael McNeil wrote:

Check the head of the frame for blocks and stuff that are designed to
prevent thieves from lifting the door off and remove them. Now locate
the holes in the bottom of the sides of the door and insert a phillips
or pozidriv screwdriver into them and wind the wheels down. Do this with
a pal as the door might drop.

Now raise the door off the runner and jiggle it out the frame. Rest it
on a couple of wooden pads then tilt it over on edge to examine the
wheels for wear while you have the chance. A little cleaning and some
light grease will work wonders. On putting it back, you use the holes to
see if you have located the runners properly before readjusting for
height and plimb. Make sure you have it locking correctly before your
mate disappears for the night.



Mine are different; you have to remove the *top* track. The bottom has a
short "upstand", the screws for which are only accessible with the door
out, to prevent the door being lifted off. I had to

1. Close the door
2. Remove the visible screws in the top track.
3. Open the door.
4. Remove the remaining screws.
5. Remove the door (the track comes with it) by titling the top
outwards, then lifting it over the "upstand" at the bottom.

BTW, these are aluminium framed and ~10 years old.

Regards,

Parish