Kobelco CK90UR

The Kobelco CK90UR is a compact crawler crane optimized for light lifting work in tight urban and indoor job sites where larger cranes would struggle with space constraints. Built with a strong 9-ton base weight, the CK90UR features a telescopic boom with five sections, capable of extending from a minimum of 4.51 meters to a full extension of 15.55 meters. This hydraulic boom is structured to deliver maximum lifting performance and flexibility in a small footprint.

The crane has a rated maximum lifting capacity of 4.9 tons at a 2.5-meter radius. The boom is operated via a reliable hydraulic system and offers a full set of operational speeds: hoisting/lowering at up to 83 m/min (fourth layer), and boom elevation angles ranging from -4° to 75°. Swinging is supported with a rotation speed of 2.6 rpm, providing precise maneuvering capability in confined working conditions.

Under the hood, the CK90UR is powered by a Mitsubishi A4AJB1 engine, producing 41.9 kW (57 PS) at 2,200 rpm. This engine supports travel speeds of 1.7 km/h (1st gear) and 2.2 km/h (2nd gear), ensuring adequate mobility for repositioning within work areas.

The crane’s compact dimensions make it highly transportable and ideal for indoor or narrow site access. It measures 4,970 mm in total length, 2,320 mm in width, and 2,430 mm in height. Its tail swing radius is just 1,450 mm, which significantly reduces the turning envelope required, minimizing collision risks in restricted zones.

Operational safety and lifting reliability are enhanced with clear load charts across different boom lengths and working radii. The machine offers consistent lifting values across a range of boom positions, with the load chart data ensuring safe operation through all movements. Ground pressure remains minimal, allowing the crane to operate on less consolidated surfaces with minimal impact.

Altogether, the Kobelco CK90UR is a specialized lifting solution built for precision tasks in spatially limited environments. It blends compact design with functional lifting capacity, providing operators with confidence and control for smaller-scale structural assembly, utility installation, and maintenance work.