Dump Truck / Trailer

A dump hoist has a deceptively hard job: raise a fully loaded body high and fast, dump clean, and settle back down — hundreds of times a week, often on a truck that never sees a wash rack. Most dump and ejector duty uses telescopic cylinders, which pack a long extended stroke into a short collapsed length by nesting several stages. That geometry is efficient, but it puts the design work into the stage seals, the bearing between stages, and the stability of the column when the body is up and the load is shifting.

The failure modes here are stability and stage sealing, not raw pressure — hoist working pressures are modest. When a body is raised with an uneven load, or the truck is not level, the cylinder sees a side load that a telescopic column handles poorly if the bearings are undersized. Getting the stage bearings and seal package right is what keeps a hoist from binding or weeping at full extension, and what keeps it from drifting down under a held load. Ejector and walking-floor cylinders trade the height problem for a high-cycle push, so their seals get chosen for the stroke count.

We build dump and trailer cylinders to the OEM print, single-stage or telescopic, and reverse-engineer discontinued hoists where the mounting and lift geometry are fixed. Rebuild is common in this sector too, since a sound outer stage often outlives its seals. New-build or rebuild, every cylinder is pressure-tested before it ships, so the first loaded raise on the road is not the proof test.

Representative applications

• Telescopic dump-body hoist cylinders
• Ejector-style trailer discharge cylinders
• Tailgate and barn-door actuation
• Live-floor and walking-floor drive cylinders
• Grain and end-dump trailer hoists