Kobelco 7150

The Kobelco 7150 crawler crane is a high-capacity lifting machine designed to handle demanding work in construction, infrastructure, and industrial projects. With a rated lifting capacity of 150 tons at 5 meters radius, this crane is built on a durable steel-welded carbody and robust crawler assemblies featuring quick-disconnect design for ease of transport and setup. The crawler system provides a maximum travel speed of 1.2 km/h (high range), gradeability of 30%, and uses 62 shoes per side with 1,070 mm (42″) wide flat shoes, ensuring low ground pressure of approximately 0.93 kg/cm².

The crane is powered by a Mitsubishi 6D22-TC six-cylinder, water-cooled, turbocharged diesel engine producing 294 PS (216 kW) at 2000 rpm. With a displacement of 11.1 liters and direct fuel injection, this engine delivers reliable performance with high fuel efficiency, supported by a 500-liter hydraulic reservoir and air-to-oil heat exchanger for sustained heavy-duty operation.

The 7150 features an advanced hydraulic system composed of four variable displacement pumps, which drive the main/auxiliary hoists, boom hoist, swing, and propel circuits. Two additional gear pumps support the control system and optional equipment such as the trans-lifter, boom foot pin cylinder, and gantry lift system. The crane’s hydraulic system operates with a maximum relief pressure of 280 kg/cm² (3,980 psi), providing smooth, precise operation across functions.

Its main boom is lattice-type, welded using high-tensile tubular steel, and pin-connected for modular length changes. The boom extends from a basic 18.29 meters (60 ft) up to a maximum of 82.3 meters (270 ft). Fixed jib options range from 12.19 meters (40 ft) up to 30.48 meters (100 ft), achieving a combined maximum boom plus jib length of 103.63 meters (340 ft). Optional mid-point boom suspensions and mast supports are required when using boom lengths of 60.96 meters (200 ft) and above.

For hoisting, the crane uses two in-line drums, each powered by hydraulic axial piston motors through planetary reducers. Both the main and auxiliary winches have maximum single line speeds of 125 m/min and utilize 26 mm diameter wire rope. Safety pawls, drum rotation indicators, and spring-set, hydraulically released multi-disc brakes ensure secure load handling.

Swing operations are driven by dual hydraulic motors providing 360° continuous rotation at up to 2.2 rpm. Swing brakes and positive mechanical locks offer controlled positioning during precision lifts. The boom hoist system uses a hydraulic axial piston motor with spring-set, hydraulically released brake, providing controlled boom raising/lowering via planetary reducer.

The crane is equipped with comprehensive safety features including hook and boom over-hoist limit switches, boom angle indicators, swing locks, boom backstops, optional load moment limiter (LMI), and automatic cut-off devices for overload prevention. The operator’s cab is designed for efficiency and safety, featuring large windows, adjustable seating, foot pedals, console-mounted controls, swing brake switches, creep speed adjustment, and integrated instrumentation for engine and hydraulic system monitoring.

The standard counterweight system consists of five stacked slabs totaling 54 tons mounted behind the machinery deck, with optional carbody counterweights of 20 tons (two-piece) and additional 8.3-ton slabs to increase lifting capacity further.

Overall, the Kobelco 7150 offers high lifting capacity, flexible boom/jib configurations, advanced hydraulic systems, and modern safety features, making it a reliable choice for contractors tackling mid-to-heavy lifting tasks in challenging site conditions.