Binding in the Track and Where Side Pressure Comes From
A door that grabs at one particular height is not a mystery, it is a map, and the height tells you where to look. The diagnosis page at Garage Door Roller Repair Orange County CA 4 Rue Montmartre deals with binding on its own because it is the fault that destroys a roller quietly, and an Orange County garage door with one tight spot will eat a new set of wheels inside a year.
What Binding Is
A wheel should carry the weight of the section and roll. Binding is any condition where it is also being pushed sideways into the flange of the rail. The wheel then has to slide as well as turn, the bearing takes a load in a direction it was not designed for, and the tread scrubs on the steel.
Finding the Height
Disconnect the operator with the door closed and run the door up and down by hand, slowly. Note the exact height where it stiffens and which side it pulls to. A bind at the same height on every cycle is a fixed defect in the rail or the hardware. A bind that moves around is a balance problem instead.
Cause One: The Rail Is Not Parallel to the Door
Vertical track is set at a specific spacing from the face of the door, and the brackets that hold it are slotted so it can be adjusted. A rail that has drifted in pinches the wheel, and one that has drifted out lets the wheel ride toward the edge. Both feel like binding to the person moving the door.
Cause Two: A Dented or Twisted Rail
A dent from a car bumper narrows the channel at one point, and that point is exactly where the door grabs. A twisted rail does the same thing over a longer distance. Both are visible by sighting along the inside of the channel with a light held at the far end.
Cause Three: The Door Is Not Square
If one lift cable has taken up more than the other, one side of the door leads the other through the travel and every wheel on the door is being asked to run at a slight angle. The bind is real and the rail is innocent. Correcting it means levelling the door, not adjusting the track.
Cause Four: The Hardware on the Section
A hinge that has lost a bolt, a hinge with the wrong number for its position, or a stem sitting in an ovalled hole all let a wheel take up an angle of its own. That is a local fault at one position rather than a whole door condition, and it usually announces itself as a single tick at a single height.
Why It Has to Be Fixed First
Fitting new rollers into a binding door replaces the evidence and leaves the cause. The bind should be found and corrected first, then the worn wheels changed, then the balance rechecked so that nothing is being pushed against a rail that has just been put straight.