Ask ten people what causes premature conveyor failure and you’ll commonly hear the same short list: belt mistracking, worn idlers, or poor maintenance. Do a quick Google search and mistracking usually tops the results. While conveniently acceptable, the latter misses the real story.
Conveyor failure is rarely due to one issue alone. Conveyors fail because – as a system – they are often misunderstood, warning signs are ignored, and short-term decisions quietly stack the deck against long-term reliability.
“A common misconception is seeing the conveyor as a single piece of equipment. A better perception is viewing the conveyor as a collection of interdependent components – belt, idlers, pulleys, load zones, transfer points, skirt boards, cleaners – each affecting the performance of the others. Neglect any one of them, and the system will eventually expose that weakness,” says Chris Mullen, components territory manager for Superior Industries.
Mullen notes that conveyor failures rarely happen at convenient times. “There’s a long-running joke in the industry that conveyor belts don’t break on Monday mornings – they break late on Fridays, weekends, or overnight,” he says, adding that those failures aren’t random. “They’re the result of small issues compounding quietly while crews are stretched thin and attention is divided.”
Belt mistracking is often blamed for conveyor problems, but it’s usually just the messenger.
Mullen explains that misaligned idlers, out-of-square pulleys, worn lagging, bent frames from mobile equipment contact – any of these can push a belt off center. Until the true root cause is identified, adjustments become guesswork. Operators may spend hours chasing the belt in one area while the real problem sits untouched somewhere else on the conveyor.
Also, Mullen cautions that with a newer, less-experienced labor force entering the industry, the ability to diagnose root causes visually and mechanically is becoming rarer. The result is more band-aid fixes and fewer lasting solutions.
Another common reality is how differently preventive maintenance is viewed across operations. Mullen says that some see it as an unnecessary expense – something to minimize when budgets tighten. “A better approach is treating it as a profit center, understanding that every dollar spent preventing failure saves multiples of that in downtime, cleanup, lost production, and emergency repairs,” he says.
Mullen points to housekeeping alone. “Manufacturer guidelines indicate that housekeeping can account for up to 40-percent of expected idler life. That’s not an exotic upgrade or capital expense – it’s just basic cleanup,” he says. “Yet with limited crews and nonstop production demands, housekeeping is often the first thing sacrificed. That sacrifice shows up later as seized idlers, belt damage, and unplanned outages.”
Material that doesn’t end up in a stockpile or a truck isn’t just messy – it’s lost revenue. Mullen says that when you factor in labor, energy, and the processing costs already invested, spilled material can cost more than two hundred dollars per ton. Over a 12-hour shift, that loss adds up fast.
Much of that loss originates from two issues - poor belt cleaning, which allows carryback to build up, and uncontrolled load zones, where material changes direction, speed, and elevation without proper containment and control.
Every conveyor application is different. Wet, sticky material behaves nothing like dry aggregate. Enclosed systems have entirely different airflow dynamics than open conveyors. That’s why one of the most effective reliability strategies isn’t a product – it’s perspective.
Mullen says a focused walkthrough by someone who looks at conveyors every day can reveal issues operators don’t have time to chase down. Producers are evaluated on tons per hour, safety metrics, and production targets – not on mastering conveyor diagnostics. Expecting operators to be experts in every failure mode isn’t realistic.
“A better approach is getting the right pair of eyes on it – conveyor specialists who know where to look, what questions to ask, and how all components interact as a system,” says Mullen.