Most conveyor problems are not mechanical failures. They are design decisions made years earlier that nobody questioned at the time. This is, until they showed up as stoppages, bruised product, failed audits, and missed throughput targets.
After two decades of designing and manufacturing conveyor systems for kiwifruit packhouses, food manufacturers, and processing operations across New Zealand and Australia, we have seen the same mistakes appear again and again.
None of them are obvious at the specification stage. All of them are expensive by the time they surface. Here are the seven we see most often, and what good design looks like instead.
This is the most common and most costly mistake in packhouse conveyor design. The system is specified to handle the average weekly volume, which looks reasonable on paper and keeps the capital cost down.
Then harvest peaks arrive. Volume spikes 40% above average for three weeks. The line backs up, accumulation zones overflow, and manual intervention fills every gap the system was supposed to eliminate. A conveyor system that cannot handle your worst week is not a system designed for your operation — it is a system designed for a spreadsheet.
The Fix? Specify for your documented peak throughput — not your average. Then add a minimum 15% buffer above that. The additional capital cost is a fraction of what one failed harvest week costs in labour, downtime, and product loss.
Every point where product moves from one conveyor to another is a potential failure point. Jams happen here. Product gets damaged here. Hygiene issues start here. In many systems we are asked to review, transfer points are an afterthought. Conveyors designed individually and connected with whatever geometry fits the space, regardless of what it does to the product passing through.
In a kiwifruit packhouse, a poorly designed transfer between a grader discharge and a belt conveyor can damage tray seals or cause misalignment that stacks into a jam within minutes of a shift starting.
The Fix? Design transfer points as carefully as you design the conveyors themselves. Consider product orientation, height differential, and speed differential between the two conveyors. A well-designed transfer is invisible in operation. A poorly designed one makes itself known within days
Accumulation is frequently cut from specifications to reduce cost. It feels like a nice-to-have... until the downstream machine slows down, product backs up, and the entire line stops while waiting for it to clear.
In food manufacturing, this typically happens when a labeller, wrapping machine, or check weigher drops speed unexpectedly. Without accumulation, that slowdown propagates immediately upstream. With accumulation, the system absorbs it and recovers without a full stop.
The Fix? Map every point in your system where upstream and downstream speeds can diverge, even briefly. Each of those points needs a designed accumulation solution. The cost of adding accumulation at specification stage is significantly lower than retrofitting it after the system is already running.
Belt selection is routinely treated as a minor detail. It is not. The belt is the surface your product contacts most on the line. In a food environment, it also needs to be cleaned thoroughly and regularly.
PVC belts are cost-effective in dry environments but degrade rapidly in washdown conditions. Fabric belts accumulate residue in weave pockets that a standard washdown cannot reach. Modular plastic belts solve both problems but require different frames and drive specifications to run correctly. The wrong belt in a food processing environment does not just wear out faster; it creates hygiene risks, fails audits, and in some cases invalidates product certifications.
The Fix? Specify belt material based on your actual cleaning regime, product contact requirements, and regulatory standards, not on what is cheapest or most familiar. The cost difference between a standard and food-grade belt is marginal against the cost of a failed audit or product recall.
This is a sequencing mistake. The facility layout is fixed (or assumed fixed), and the conveyor system is designed to fit it. The process flow is treated as a constraint rather than the starting point.
The result is systems that are technically functional but operationally inefficient. The product travels further than necessary. Workers have to reach around the conveyors to access the machines. Cleaning is difficult because nobody considered access during design. Maintenance requires partial disassembly of adjacent equipment.
The Fix? Start with the process. Map the product flow from intake to despatch. Identify every decision point, speed change, accumulation need, and integration with existing equipment. Then design the conveyor layout around that process — not around the floor plan.
A conveyor system that cannot be maintained quickly is a system that will fail expensively. Maintenance access is routinely compromised during design to save floor space or fit around other equipment.
In practice, this means belt changes that take three hours instead of thirty minutes. Roller replacements that require adjacent conveyors to be shut down. Motor swaps that need a mechanic to work around active equipment. During harvest or a production run, every hour of unplanned maintenance is an hour of lost throughput — compounding across the full service life of the system.
The Fix? Design maintenance access into the system from the start. Specify the maximum acceptable time for a belt change, roller replacement, and motor swap. Then, design the system to meet those standards. Ask your supplier to walk through the maintenance procedure for every component before you sign off on the design.
A conveyor system designed to last 15 to 20 years will need parts during that time. Belts wear. Rollers fail. Drive components need replacement. If your supplier cannot provide parts from New Zealand within a reasonable timeframe or uses components that are no longer manufactured, your maintenance strategy is reactive by default.
We have seen operations brought to a standstill waiting on a single belt splice, a specific roller bearing, or a motor control card shipped from overseas. The capital savings from buying the cheaper system evaporate the first season it goes down at the wrong moment.
The Fix? Before you buy, ask your supplier: Where are parts stocked? What is the lead time on the ten most commonly replaced components? Do you offer a preventative maintenance schedule? A supplier who cannot answer these questions clearly is not a long-term partner.
None of these mistakes happened because someone was careless. They happen because conveyor systems are complex, design phases move quickly, and the long-term operational consequences of specification choices are genuinely difficult to see at the time.
They also happen because many buyers compare suppliers on price, which makes it very difficult to evaluate the quality of design thinking behind a quote. The question worth asking is not "which system is cheapest?" It is "which supplier has asked me enough questions to actually understand my operation?"
Conveyor design mistakes are not equipment failures. They are knowledge gaps, and they are entirely preventable with the right partner at the specification stage.
At MCL, every system starts with a free on-site consultation. We look at your process, your product, your throughput targets, and your facility before we recommend anything. Because the right system for your operation looks nothing like the right system for the operation next door.