Carton Flow Racking Repairs — SEMA-Aligned, Nationwide

Carton flow racking is hand-loaded gravity picking. Inclined tracks of wheels or rollers are fitted into a wider pallet racking structure, normally at the lower, walkable pick-face levels. Cartons and totes are replenished from the rear and roll forward under gravity so a full face is always presented to the picker.

The important structural point is that carton flow is almost never a standalone system. It is a picking module inside pallet racking — usually with bulk pallet storage on the levels directly above, replenished by forklift. That means two very different traffic types meet in the same bay: people and trolleys at the face, trucks and pallets above and behind.

Damage follows that traffic. Unlike pallet flow racking, where faults concentrate in heavy running gear, carton flow damage is dominated by manual handling contact at the front beam and by track crushing from stock that is heavier than the lane was designed for.

None of that makes it a cosmetic problem. A crushed track stops flow, so pickers reach in and drag stock through, which loads the front beam and the divider in ways they were never intended to carry — and the same bay is holding pallets overhead. The structure and the tracks have to be assessed together.

The front beam of a carton flow level does two jobs at once: it is a structural load beam in the pallet racking bay, and it is the front support for the picking tracks. Damage to it is therefore both a capacity issue and a flow issue.

Why it gets hit constantly. The pick face is the only part of a racking installation people are in physical contact with all shift. Trolleys and roll cages are pushed up against it, cartons are dragged across it, and replenishment pallets are landed close to it. The damage is cumulative rather than dramatic — many small contacts rather than one big strike.

What we measure. Beam deformation is assessed against SEMA deflection criteria, along with connector engagement and the presence and condition of safety locks. A beam that has been lifted out of its connector by an upward fork movement is a common and easily missed finding at replenishment levels.

Replacement, not straightening. A deformed beam is replaced with a matching manufacturer section. Cold-straightening removes the strength that the section relied on and gives no way of verifying the remaining capacity.

Protect the face afterwards. Where the same beam or upright is being damaged repeatedly, we quote barrier or guard protection with the repair. On a pick face, guarding the leading upright and the end of the run addresses the majority of repeat damage.

Carton flow tracks are rated for hand-loadable stock. When heavier or denser product is put into a lane built for light cartons, the wheel bed deforms — usually not immediately, but progressively under sustained load.

How crushing shows itself. First cartons slow at one point in the lane, then they stop and need a push, then the lane needs to be pulled through by hand every time. By the time the track is visibly bowed the wheels either side of the low spot are usually damaged too.

Double-stacking is the other cause. Loading two cases high in a lane designed for single presentation doubles the point load on the same wheels and pushes the upper case against the divider. Where we see it, it goes in the report, because renewing the track without changing the practice buys a few months at most.

Section replacement. Wheel beds, full track lengths, dividers and front stops are replaced in matched manufacturer sections. Wheel pitch, wheel diameter and track width vary between systems and between duty ratings within the same installation, so mixing parts creates steps in the running surface.

Set the incline, then test. Track incline is a design value delivered by the front and rear support positions. It is restored to specification and each lane is flow-tested with representative cartons rather than being eyeballed.

Carton flow repairs are almost always carried out in the busiest part of an operational warehouse, with bulk pallets stored directly overhead. The method matters as much as the parts.

Deal with the structure first. A crushed track is inconvenient; a damaged upright under a bulk pallet level is a risk to everyone at the face. Structural findings are always resolved before, or at the same time as, the track work.

Offload above before beam work. Where a pick-face beam or upright is being replaced, the pallet levels above are cleared and the load path is confirmed before anything is removed. This is planned in advance so the disruption window is known.

Segregate pickers from the works. Lanes under repair are isolated and physically separated from the live picking area, not simply marked. Partial working of a bay under repair is the most common way people get hurt during otherwise routine maintenance.

Report the causes, not just the repairs. Our completion report records overloaded lanes, double-stacking, trolley contact points and unguarded uprights alongside the work carried out — the same approach we take on planned racking maintenance, cantilever racking repairs and standard pallet racking repairs.