DDM Garage Doors

Leveling Garage Doors

The purpose of this tutorial is to show how professional garage door installers and service technicians level smaller and lighter overhead-type sectional commercial and industrial, as well as residential, garage doors. These doors usually have a continuous hollow shaft running all the way across the top of the door. While heavier industrial doors have keyed solid shafts with a coupler that can be adjusted to level the door, lighter commercial and most residential garage doors do not have couplers for leveling the doors. These doors are leveled by rotating the cable drum on the side that is higher.

The most common cause of overhead-type doors being out of level is frayed cables that grow in length as they fray. Doors also rise on one side when the cable is not properly seated on the cable drum on the opposite side. If the cable is not fitted properly on the drum or is frayed, this tutorial will not help you. You will need to either replace a cable or to reset a cable on one of the cable drums.

This is a dangerous procedure. Pay close attention to warnings that appear in red, including this one. If you question your ability to make this adjustment safely, hire a professional. Keep hands and clothing away from the shaft, torsion springs and drums. For most who try this the garage door gets worse before it gets better. Be prepared to have to rewind the spring or springs, especially on heavier doors.

1. SAFETY FIRST! To begin, turn off the power to the operator. Many operators are hardwired and have their own fuse or breaker box. You will need to turn off the power or maybe pull a fuse. Others are turned off at a breaker box with multiple switches that control power to other equipment as well. Many door openers are plugged in to 110 volt outlets and you can simply unplug them. Still others have power switches above the operators.
	2. Use caution when on a ladder. While step ladders tend to suffice for residential work, you probably will need an extension ladder for commercial and industrial work. When you work on a ladder always hook one of your legs through a rung on the ladder to stabilize yourself.
3. Move to the cable drum on the side of the garage that is lower and on the floor. Turn the setscrews clockwise to tighten them as needed. When tightening setscrews you will need to turn the screws 3/4 turn past the point the setscrew first meets the shaft.
	4. Using a marker or file, mark the shaft and the drum. The mark on the shaft should be about 1/4" above the mark on the drum, as shown. If the gap under the door is less than one inch, make the marks 1/8" apart.
5. Vise grip the shaft so that the end of the vise grip is firm against the top of the garage door. We do this to keep the drum from turning too much and to keep the shaft from spinning if the setscrews on both cable drums are too loose.
	6. Very slowly loosen one setscrew. Watch the two marks. You want the two marks to line up, but don't loosen the setscrew enough for the drum to move 1/4 inch. It will probably move at least 1/2 inch or more and create a worse problem on the other side of the garage door. Loosen the screw enough only until you see the first movement of the drum. Immediately, re-tighten the setscrew 1/4 turn. Loosen the setscrew again until you see the lower mark move and immediately re-tighten the set screw. Repeat this process of moving the drum in 1/16" increments until the two marks line up.
7. If the drum does not turn from loosening one of the setscrews, tighten the first scetscrew half way and loosen the other setscrew following the same procedure as with the first setscrew. Once the two marks line up, tighten the setscrew just enough that the marks will stay where they are.
	8. After you tighten the setscrew, check to see if the bottom of the door is level. If it is level, jump to step 12. If not, continue with the next step.
9. Add a second mark on the shaft just above the first mark as shown. Release and reset the vise grip as in step five above.
	10. Very slowly loosen one setscrew again and follow the same procedure again in steps six through nine above.
11. Once the mark on the cable drum lines up with the new mark on the shaft, tighten the setscrew enough to keep the marks together. If the bottom of the garage door is still not level, repeat this process following steps six through nine with another mark or marks until the door is level. Remember to release the vise grip each time you get to step nine.
	12. If the garage door is level, tighten the setscrew(s) 3/4 turn past the point at which they meet the shaft. Heavier doors may require an additional 1/4 turn. Caution: Under-tightening the drums could cause the drum to slip and the door to cock or fall. Over-tightening the setscrews could damage the shaft or drum, resulting in the same problems. This is a critical step.
13. Remove the vise grip from the shaft.
	14. Check the bottom of the garage door from the floor to verify that it is level.
15. Turn on the power to your operator.