Your garage door is the largest moving object in the house and it runs on parts that wear on a schedule. Twenty minutes twice a year, ideally in spring and again before winter, catches the failures that otherwise arrive at 6am on a Monday.
1. The balance test
This is the single most useful check. Close the door, pull the red emergency release cord to disconnect the opener, then lift the door by hand to about waist height and let go.
A correctly balanced door stays put. If it slams down or flies up, the spring tension is wrong and the opener is compensating for it, which is how openers die young. That is a spring adjustment, not a DIY fix.
2. The safety reverse test
Reconnect the opener. Lay a roll of paper towel flat on the floor in the door's path and close the door. It should hit, stop and reverse. Then test the photo-eye sensors by waving something through the beam as the door closes. If either test fails, the door is not safe around children or pets.
3. Rollers, hinges and bearings
Look for cracked nylon, flat-spotted steel, wobbling stems and rollers that will not turn freely. Check hinges for cracks around the bolt holes, particularly the end hinges that carry the roller stems.
4. Cables and drums
Look, do not touch. You are checking for fraying, kinks, rust and loose winding on the drums. A cable with broken strands is on a countdown. See cable repair.
5. Springs
Look for gaps in the coil, rust, and any sign the spring has stretched. Count the cycles honestly: a 10,000-cycle spring on a door you open six times a day is a seven-year part, not a lifetime one.
6. Tracks and fasteners
Tracks should be plumb, parallel and free of dents. Tighten the lag bolts holding the track brackets and the bolts on the hinges.
7. Weather seal and bottom section
Maryland damp finds every gap. Check the bottom astragal for splits, and check the bottom section itself for rust or rot, which is where doors usually fail first. If it has gone, look at panel replacement.
8. Lubrication
Garage door lubricant or white lithium grease on hinges, roller bearings, the spring coils and the opener rail. Never on the track surface.
9. The opener itself
Test the remotes, the keypad and the manual release. Replace remote batteries annually rather than waiting. If your opener has no photo-eye sensors it predates 1993 safety requirements and should be replaced.
When to hand it over
Anything involving springs, cables or the bottom brackets is a technician job. If you would rather someone ran the whole list properly, a professional tune-up covers all of the above and takes about an hour. We run them across Baltimore, Frederick, Rockville and every other town in Maryland.