Trade Notes
Cycle counts, downtime and what commercial doors actually need.
How Often Should a Commercial Roll Up Door Be Serviced?
The standard answer is annually. For a commercial door that answer is close to useless, and here is the arithmetic that shows why.
Cycles, Not Years
Every wearing part on a door is rated in cycles. One cycle is the door opening and closing once. Springs are rated in cycles. Bearings, guides, slat edges and operator components all wear per cycle.
Nothing on a door wears by the calendar. It wears by use.
Run the Numbers on Your Own Door
A house door runs roughly four cycles a day. Around 1,500 a year.
A light industrial unit with a couple of staff vehicles, deliveries and occasional customer access runs perhaps fifteen. About 5,500 a year.
A busy unit with regular deliveries, several vehicles and customer traffic runs forty or more. Over 14,000 a year.
That top case reaches in one year what a house door takes nearly ten years to accumulate. Servicing it annually is servicing it at a tenth of the rate it needs.
Working Out Your Interval
Count for a week. Not an estimate, an actual count, because everyone underestimates. Ask whoever is nearest the door to make a mark each time it runs.
Multiply by fifty for a working year, then:
- Under 3,000 cycles a year: annual service is fine.
- 3,000 to 8,000: twice a year.
- 8,000 to 20,000: quarterly.
- Over 20,000: quarterly at minimum, and worth discussing high-cycle spring specification when the current set is replaced.
Those are starting points rather than rules. A dusty site, a coastal one, or a door taking regular knocks from forklift traffic all move the interval down.
What Fails on Commercial Doors
Springs, and they are the item that most repays planning. A spring set replaced on a scheduled visit is a normal job. A spring failing mid-shift is a stopped operation. Both cost about the same in parts.
Guides, which pack with grit and distort. A curtain fighting its guide is the single most common reason an operator trips out, and it grinds the slat edges every cycle.
Bearings at the barrel ends. They squeal when dry and seize when ignored, and a seized bearing puts the whole load through the operator.
The bottom bar and lower slats, which take the impacts. Vehicle contact is not an if.
The operator, though usually last and usually as a consequence of the above.
The Operator Is Usually the Symptom
Worth stressing because it is where money gets wasted.
A large share of commercial call outs come in as “the operator keeps tripping” or “the motor is failing”. Most of the time the operator is doing exactly what it should. Its overload protection has detected that something is taking more force than it should, and it has stopped rather than destroy itself.
The cause is nearly always mechanical: a binding guide, tired springs, a door out of square. Replace the operator without fixing that and the replacement inherits the same problem, works itself to death, and trips too.
Any quote to replace an operator that does not mention checking the mechanics is a quote worth questioning.
The Coastal Complication
Long Beach units get salt air on top of ordinary industrial wear.
Salt corrodes springs, creating stress points where they eventually break, and it attacks barrel bearings and fixings. Guides collect both salt and dust, and the mixture is abrasive.
Practically, spring life here comes in short of the rating and guides need clearing more often than a generic schedule suggests. It is worth mentioning your location when discussing intervals.
Costing It Honestly
The repair is rarely the expensive part.
A spring set on a commercial door is a few hundred dollars. A morning where nothing can ship, staff are standing about and a delivery is turned away is usually more, and a full day certainly is.
That is the entire case for planned servicing, and it is a business case rather than a maintenance one. It is also why priority response is usually the most valuable clause in a service contract: when the door is down, the question is not what it costs but how fast someone arrives.
When You Genuinely Do Not Need This
If your door runs a few times a week and the business would carry on regardless with it stuck, an annual service is plenty and a contract is poor value.
Any door company that will not tell you that is worth being careful with.
Call Exploration17 at (562) 744-2303 and tell us your cycle count. If a contract does not make sense for your door, we will say so.
What to Ask For in a Service Report
If you are paying for planned servicing, the report is what you are actually buying. A tick-list that says “door serviced” tells you nothing and cannot be budgeted against.
A useful report names the parts, states their condition, and gives a rough remaining life. Something like: springs estimated at 60 percent of rated cycles, guides cleared and lubricated, three lower slats showing edge wear from guide contact, barrel bearings acceptable, safety edge tested and reversing correctly.
From that you can plan. You know a spring set is coming in roughly eighteen months and you can put it in next year’s budget rather than finding out on a Tuesday morning.
It also gives you a record of safety device testing, which matters on any site where staff operate the door.
A Note on Safety Devices
On a powered commercial door used by employees, the reversing protection is not a convenience feature.
Photo eyes across the opening, a safety edge on the bottom bar, and on some installations an audible warning. These get disabled more often than anyone admits, usually because one is faulty and the door has to keep working, and the temporary bypass becomes permanent.
If a device has been bypassed on your door, get it repaired rather than left. A powered commercial door closing on someone is a serious incident, and a bypassed safety device turns an accident into a liability question with a documented answer.
We test these on every visit and write down the result, whether or not anyone asked.
Call Exploration17 at (562) 744-2303.