The Job
This Pilsen auto body shop runs their coil service door roughly 80 to 90 cycles per day — that’s a residential garage door’s weekly usage, every single day. At that rate, a standard commercial door without a maintenance contract will accumulate enough wear in 18 months to cause a failure that shuts the bay down mid-production. We’ve been doing quarterly service on this door since 2022; this visit is why that contract pays for itself.
What We Found
The quarterly visit in early December turned into a half-day partial rebuild. The slat bearings on the coil barrel were worn to the point of generating heat during operation — you could feel warmth in the housing two seconds after a complete cycle. The electric operator’s limit switch had drifted two inches on the down-travel side, causing the bottom bar to hit the floor seal with excess force and then reverse. The shop had been manually overriding this for weeks by pressing the wall button twice on every close cycle — a workaround that tells you exactly how long the problem had been building.
We replaced the worn slat bearings, reprogrammed the operator’s up and down limits from scratch, and calibrated the torque settings to the measured door weight. The bottom astragal seal was cracked from the repeated hard contacts; we replaced that too. The operator now closes clean and seats against the floor seal with the right amount of force. A bearing failure in this application would have cost the shop two to three days of bay downtime. This service call cost them four hours.