Preventive Maintenance Inspection

Disconnect operator power

Disconnect the electric operator from power (pull the release cord or disconnect at the outlet/breaker). This prevents accidental activation during inspection.

Inspect hardware and fasteners

Check all hinges, roller brackets, end brackets, and bearing plates for loose bolts. Tighten as needed. Look for cracked hinges or brackets — replace any that show fatigue or damage.

Inspect rollers

Check each roller for wear, chipping, or flat spots. Nylon rollers should be replaced if cracked. Steel rollers should spin freely without grinding. Replace any roller that does not turn smoothly.

Inspect cables and cable drums

Examine lift cables for fraying, rust, or kinks. Check that cables are properly seated in the cable drum grooves. Verify cables are taut when the door is closed — slack cables indicate a spring tension issue.

Inspect springs

Check torsion springs for rust, gaps between coils, or visible cracks. For extension spring systems, verify safety cables are installed through the springs. Note the spring's approximate cycle count based on usage and assess remaining life.

Inspect tracks and weatherseal

Verify tracks are plumb and level. Check for bends, dents, or debris in the track. Ensure the track spacing is correct (use a level against the track). Inspect bottom weatherseal and side/top perimeter seals — replace if brittle or torn.

Lubricate moving parts

Apply a light machine oil or white lithium grease to all hinges, roller stems, and bearing plates. Lubricate the torsion spring coils with a light oil to prevent rust. Oil the chain or belt drive on the operator if applicable. Do NOT lubricate nylon rollers or tracks.

Test manual balance

With the operator disconnected, lift the door to waist height and release. A properly balanced door should stay in place, rising or falling no more than a few inches. If the door moves significantly, the springs need adjustment.

Reconnect operator and test

Restore power to the operator. Run the door through a full open and close cycle. Listen for unusual noises. Verify the door opens and closes fully without stalling.

Test safety reversal system

Place a 1.5-inch tall object (such as a 2x4 laid flat) on the floor in the door path. Close the door — it must reverse on contact with the object. Test photo eye sensors by breaking the beam during a close cycle — the door must reverse immediately.

Document findings and recommendations

Record all inspection results, measurements, and any deficiencies. Note parts replaced and recommend any follow-up repairs. Provide the report to the building owner or property manager.