A vehicle-mounted crane is a lifting device permanently fitted to a truck chassis, powered by the vehicle's engine through a power take-off (PTO) and hydraulic pump. The term covers loader cranes (also called knuckle-boom or articulated cranes) mounted behind the cab or at the rear of flatbed trucks, as well as truck-mounted all-terrain cranes used for heavier lifts. The chassis provides mobility between job sites, while outriggers or stabilizer legs extend to provide a supporting base during lifting operations.
Design and Components
The main structural elements are the crane column, boom (telescopic or articulated/knuckle-boom sections), hydraulic cylinders, and a slewing mechanism that rotates the superstructure, typically through 360 degrees on larger models. Articulated booms fold for compact transport and extend in multiple stages to reach over obstacles such as building facades. Hydraulic outriggers, extended laterally and vertically, distribute ground loads and establish the stability base required during lifting. Counterweight is usually provided by the truck chassis itself combined with the outrigger footprint rather than separate ballast blocks, distinguishing these units from crawler or all-terrain mobile cranes.
Classification
Loader-type vehicle-mounted cranes are rated by lifting moment, expressed in kilonewton-meters (kNm) or tonne-meters (mt, where 1 mt is approximately 9.81 kNm). Commercial units range from light-duty cranes rated below 10 kNm, suitable for handling building materials up to roughly half a tonne at several meters reach, to heavy-duty truck cranes exceeding 2000 kNm, capable of lifting several tonnes at extended radii or tens of tonnes close to the column. Actual capacity at any given boom length and angle is defined by the manufacturer's load chart, which must be displayed in the operator's station.
Standards
In the European market, loader cranes fall under EN 12999, which specifies safety requirements, design verification, and testing for crane loaders mounted on vehicles. Structural and mechanical safety requirements for mobile and truck-mounted cranes more broadly are addressed in EN 13000. In North America, stability and structural competence are commonly verified against SAE J765, while operational safety requirements, including inspection intervals and operating practices, are set out in ASME B30.5 for mobile and locomotive cranes.
Operator Qualification
Operation of vehicle-mounted cranes is subject to national training and certification requirements. In Germany, operator qualification follows DGUV Grundsatz 309-003, which defines theoretical and practical training content for crane operators. In the United States, operators of articulating boom cranes are commonly required to hold certification through the National Commission for the Certification of Crane Operators (NCCCO) for work on many commercial and industrial sites.
Inspection and Maintenance
Periodic inspection requirements differ by jurisdiction. In Germany, DGUV Vorschrift 52 requires an initial inspection before first use and at least annual inspection thereafter by a qualified person (Sachkundiger) or, depending on findings, an expert (Sachverständiger). In the United States, ASME B30.5 distinguishes between frequent inspections, performed daily to monthly depending on usage, and periodic inspections conducted annually. Inspection scope typically covers structural welds and boom sections, hydraulic cylinders and hoses for leaks, wire ropes or chains, outrigger locking mechanisms, and overload protection devices.
Application
Vehicle-mounted cranes are used for self-loading delivery of building materials, placement of precast concrete elements, positioning of rooftop equipment such as HVAC units, and general material handling at construction sites where a dedicated mobile crane would be impractical for the load and reach required.