Kato KR50H-L (SL-600)

The Kato KR50H-L, also known under the name SL-600, is a 51-ton capacity rough terrain crane developed for both high-capacity and high-reach performance in tight or urban work environments. Unveiled publicly during the Conet 2000 exhibition in Japan, the crane drew attention for its robust lifting chart and long reach, and has since seen widespread adoption with over 50 units delivered across Japan.

This model is equipped with a 43.0-meter fully hydraulic, 6-section telescoping boom, fabricated from high-strength steel with an oval profile for improved torsional rigidity. Boom operation is powered by dual-action hydraulic cylinders with sequenced extension. Complementing the main boom is a 13.7-meter bi-fold fly jib that can be offset at angles of 5°, 25°, and 60°, providing a maximum hoisting height of 58.0 meters. The boom luffing range spans from -2° to 81°, enabling precision lifting at various working angles.

The crane utilizes a Hino E6024-TCE2 intercooled turbo diesel engine rated at 257 kW (350 PS) at 2,200 rpm and producing a maximum torque of 1,620 Nm at 1,500 rpm. This powerplant drives the 4×4 hydro-mechanical drive system with full-time all-wheel steering. The crane can reach a top travel speed of 49 km/h and has a maximum gradeability of 60%. It features a 5-mode steering system for navigating confined spaces, including front-only, rear-only, crab, concentric, and opposite steering.

The KR50H-L is mounted on a 3,400 mm wide chassis with a wheelbase of 3,460 mm. Its compact dimensions (12,400 mm long and 3,000 mm high) ensure that it remains mobile and compliant with road regulations. The full operating weight is 29,800 kg, while the gross vehicle weight on public roads is 19,815 kg. The outrigger system features 4 hydraulic vertical jacks and horizontal beams, allowing for 3 preset working widths—6,500 mm, 5,500 mm, and 4,500 mm—to suit various working environments.

Hoisting is handled by dual winches powered by hydraulic axial piston motors, allowing for a line speed of up to 120 m/min (main winch, 4th layer) with a 18 mm wire rope and 125 m drum capacity. Hook blocks range from 51-ton (6 sheaves) to 2.5-ton (single sheave) configurations, with the option of a 4.5-ton rooster sheave.

The KR50H-L features Kato’s proprietary ACS (Automatic Crane Safety) system, which offers load moment limiting, boom angle limiters, automatic hook overwind prevention, and voice alarm notifications for enhanced safety. Additional safety features include fail-safe brakes, anti-two-block systems, and multiple status monitors for hydraulic pressure, engine condition, and load capacity.

Operator comfort is also a key aspect of this crane, with an ergonomically designed cabin that includes an air conditioner, oil cooler, heater, AM/FM radio, sun visor, and adjustable pilot control seat. The cab tilts up to 20° to improve upward visibility during high lifts.

Overall, the Kato KR50H-L (SL-600) combines compact mobility with high lifting performance, making it a highly capable rough terrain crane for infrastructure development, plant work, and construction projects that demand both power and agility in constrained job sites.