Helical gear hydraulic rotary actuators convert hydraulic pressure into precise, powerful rotation — no external gearboxes, no brakes, no grease points. Here's how eight industries put the SJH design to work.
From bale handlers and loader grapples to implement positioning drives, agricultural equipment rotates in dusty, wet, and unforgiving conditions. SJH rotary actuators are sealed against dust and rain and never need grease — so there are no lube points to miss in the middle of harvest, and no seized rotators when the season is on the line.
Excavator grapples, demolition attachments, and drilling equipment subject rotation drives to constant shock loading. The SRC Series in particular pairs high moment capacity with counterbalance-valve overload protection that reacts instantly to impacts — protecting the actuator, the attachment, and the carrier from the hits a demolition site hands out daily.
Utility derricks, pole-setting equipment, pipeline handling, and energy service rigs demand smooth, precise rotation under sustained load — often in remote locations where a failed component means a very long day. Free over-run protection stops the load exactly where the operator stops it, and the maintenance-free bearing design keeps equipment in the field instead of in the shop.
Salt spray, washdown, and constant humidity make marine duty the ultimate seal test. SJH actuators — and the SRS Series especially — keep contamination out and lubrication in, with oil-immersed bearings that thrive in exactly the conditions that flush the grease out of conventional rotators on deck cranes, davits, and dockside handlers.
Forestry grapples, scrap handlers, and container rotators run continuous duty cycles that expose every weakness in a rotation drive. Higher moment capacity in the same envelope means SJH units drop into existing attachment designs and simply last longer — and for rental fleets, "never needs grease" is the line that closes the sale.
Recovery vehicles, loading systems, and mission equipment demand rotation drives that are light, compact, and absolutely dependable. The SJH design delivers more torque per pound with fewer components — fewer things to fail, less weight to carry, and sealed internals that shrug off the environments deployments actually happen in.
Rock, dust, vibration, and shock: mining applications punish rotary actuators harder than any other market. High-moment bearing support and instant-reacting overload protection let SJH units absorb the abuse, while sealed, oil-immersed internals keep abrasive dust away from the surfaces that matter.
On truck-mounted cranes, hooklifts, and trailer equipment, every pound of component weight comes straight out of legal payload. A lighter actuator with the same footprint and more torque lets builders upgrade rotation packages without redesigning mounts — and without giving up a single pound of capacity.
These eight markets are where we work most — but the SJH design fits any application that needs compact, high-torque rotation with built-in load holding. Describe what you're building and our engineering team will tell you honestly whether a rotary actuator is the right answer.
Talk to an EngineerSend us your application details and our North American engineering team will size the right series, confirm interchangeability with your current unit, and quote it — fast.