Garage Door Come Off Its Track? Do Not Force It

What causes it

These are the causes we find most often, in roughly the order we check them.

1. 1

   Vehicle or trailer impact

   A reversing bumper, a trailer drawbar or a tyre against the bottom panel bends the vertical track outward. The roller then has nothing to run in at that point and pops out of the channel on the next cycle.

   What you can check

   Look at both vertical tracks from the side at about bumper height. A track that has been struck shows a bow, a crease or a bright scrape. Check the bottom panel for a matching dent while you are there.

   What we do

   We replace the damaged track section rather than hammer it back, because a straightened track never runs true again. The door is lifted back into the rails under controlled tension, the rollers are checked for damage, and the assembly is re-plumbed and re-squared.

2. 2

   Broken lift cable letting one side drop

   Each side of the door is held by a steel cable running to a drum. When one cable snaps or slips off its drum, that side drops instantly and the door racks in the opening, levering the rollers on the opposite side out of the track.

   What you can check

   From a safe distance, look at both cables in whatever position the door has stopped in. One slack, frayed or unwound cable, together with a door sitting visibly higher on one side, is a cable failure. Do not touch it.

   What we do

   We support the door, release the spring tension safely, fit new cables as a matched pair, re-seat both drums and reset the torsion tension. Then we re-track the door, re-square it in the opening and run several full cycles before handing it back.

3. 3

   Worn or snapped roller stems

   The roller stem is a short steel shaft pressed into the hinge. Twenty years of load, plus corrosion in Perth's coastal air, works the stem loose or breaks it. The roller then wanders in the track and jumps out at the curve.

   What you can check

   With the door closed, look at every roller in turn. Any roller sitting at an angle, protruding further from its hinge than its neighbours, or missing altogether, is on the way out.

   What we do

   We replace the rollers and any hinges with elongated stem holes, because a worn hinge will spit a new roller straight back out. Nylon rollers on sealed bearings are the standard replacement and they suit our climate far better than bare steel.

4. 4

   Loose track brackets pulling out of the jamb

   The vertical tracks are fixed to timber. Over twenty years the timber shrinks, the lag screws lose their grip, and the track drifts away from the door under load until the rollers no longer sit in the channel.

   What you can check

   Push and pull each vertical track by hand with the door shut. Movement of more than a few millimetres, gaps behind the brackets, or screw heads standing proud are all warning signs.

   What we do

   We re-fix into sound timber, add a steel angle or new jamb packing where the original fixing points are chewed out, and reset the track spacing to specification. If the jamb itself has rotted we will tell you it needs carpentry before the door is safe.

5. 5

   Closing on an obstruction

   A bin, a bike, a wheelie bin lid or a tyre left in the opening stops one side of the door while the other keeps travelling. The door racks in the frame and the rollers on the free side lever themselves out of the track.

   What you can check

   Look at what is on the floor in the opening, then look at the shape of the door. A door sitting diagonally, with a gap at one bottom corner, has been racked. Note whether the safety reversal failed to trigger at all.

   What we do

   We re-track and re-square the door, replace any panel or bracket that took the load, then test the auto-reverse and the photo eyes properly. An obstruction that did not trigger a reversal is a safety fault in its own right and needs fixing.

6. 6

   Corroded or distorted track in coastal suburbs

   Garages within a few kilometres of the coast, from Scarborough down through Cottesloe to Fremantle, take salt-laden air through every gap. Untreated steel track corrodes from inside the channel outwards, the surface flakes, and the rollers eventually climb out.

   What you can check

   Run a torch inside the track channel. Orange scaling, flaking galvanising, or a rough surface where the roller runs, all mean the track is past its service life.

   What we do

   We replace the affected track in galvanised steel and swap corroded fixings for the appropriate grade, then set a maintenance interval that suits a coastal address. Cables and springs in the same garage are usually the same age and worth checking on the same visit.