Kato MR-350RfII Load Chart PDF + Specifications

The MR-350RfII represents the second-generation evolution of Kato’s popular 35-ton rough terrain crane range. Marketed under the SuperBoom series, the crane is built around the KRM-35H-F carrier and incorporates a highly efficient six-section hydraulic telescopic boom. The design emphasizes maximum lifting performance within a compact chassis footprint, making it particularly suitable for work in congested urban environments, petrochemical facilities, power stations, and industrial construction sites where operating space is restricted.

The crane’s principal lifting equipment consists of a six-section box-type hydraulic boom extending from 7.5 m to 32.5 m. Telescoping is accomplished through a synchronized hydraulic and wire-rope system, with sections 2 and 3 extending simultaneously and sections 4, 5, and 6 extending together. Maximum rated lifting capacity is 35 tonnes at a 2.6 m working radius using ten-part reeving on the shortest 7.5 m boom. Capacities remain competitive throughout the boom range, including 19 tonnes on the 12.5 m boom, 17 tonnes on the 17.5 m boom, 12 tonnes on the 22.5 m boom, 9 tonnes on the 27.5 m boom, and 7 tonnes on the fully extended 32.5 m boom. A 4.5-ton rooster sheave is also available for single-line lifting duties.

A major distinguishing feature of the MR-350RfII is its hydraulically telescoping SL Jib system. Unlike conventional fixed fly jibs, the SL Jib consists of a three-section hydraulic telescopic structure that can be extended from 6.5 m to 14.0 m and luffed hydraulically. Offset angles range from 5° to 60° (7° to 60° on certain configurations), allowing operators to place loads behind structures, over obstacles, or onto elevated locations without relocating the crane. Maximum rated capacities are 3.2 tonnes on the 6.5 m jib, 2.0 tonnes on the 10.25 m jib, and 1.35 tonnes on the fully extended 14.0 m jib. Maximum hook height reaches 47.9 m when the jib is installed on the fully extended boom.

Lifting performance is supported by twin independent hydraulic winches powered through planetary reduction gearboxes with integrated negative brakes. Both the main and auxiliary hoists provide rope speeds of 125 m/min on the fourth rope layer. Main hook speed reaches 12.5 m/min with ten-part reeving, while the auxiliary single-line hook achieves 125 m/min. High-speed no-load lowering is available at up to 163 m/min, improving productivity during repetitive lifting cycles.

Boom elevation ranges from -10° to 84°, providing excellent versatility for both high-angle lifting and low-angle operations. Boom raising from -10° to 84° requires approximately 44 seconds, while the full 25 m telescoping stroke is completed in around 85 seconds. Slewing is accomplished through a hydraulic motor and planetary gearbox arrangement, producing a maximum slewing speed of 2.5 rpm. The crane maintains a compact tail swing radius of only 2.85 m, allowing operation in restricted work zones.

The fully hydraulic H-type outriggers offer multiple deployment widths to suit confined jobsites. Maximum outrigger spread is 6.8 m, with intermediate positions at 6.3 m, 5.2 m, and 4.2 m, while the minimum spread is only 2.31 m. Load charts are provided for each outrigger setting, enabling useful lifting performance even where full deployment is impossible.

Power is supplied by a Cummins QSB6.7-4E electronically controlled common-rail diesel engine compliant with Japan’s 2014 emissions regulations for special-purpose vehicles. The water-cooled six-cylinder engine develops 209 kW (280 hp) at 2,000 rpm and produces 1,152 Nm of torque at 1,500 rpm from a displacement of 6.69 litres. The engine is coupled to a torque-converter transmission with automatic and manual shifting capability, providing four forward gears, one reverse gear, and Hi/Low range selection.

Travel performance is excellent for a crane of this capacity class. Maximum road speed reaches 49 km/h while gradeability is rated at 55%. The drivetrain offers selectable 4×2 and 4×4 operation, enabling efficient highway travel and improved traction on construction sites. Steering flexibility is enhanced through five steering modes comprising front-wheel steering, rear-wheel steering, counter steering, crab steering, and independent steering. The minimum turning radius is only 4.9 m in four-wheel steering mode, making the crane highly maneuverable in confined locations.

Safety systems are centered around Kato’s ACS (Automatic Crane System) with integrated overload protection and voice warning functions. Additional safety features include anti-two-block protection, work-area limitation, automatic outrigger-width detection, electronic level indicator with outrigger leveling assistance, boom and jib lowering protection devices, hydraulic safety valves, winch braking systems, swing lock, outrigger lock system, and automatic swing stop functionality. Optional Safety View and Clearance Sonar systems provide operator assistance through surround-view cameras, human detection technology, and proximity monitoring.

Operator comfort is enhanced through a fully enclosed cab equipped with automatic air conditioning, a fully adjustable suspension seat with headrest and armrests, power windows, USB power supply, intermittent windshield and roof wipers, LED work lighting, winch monitoring camera, Bluetooth radio options, and numerous visibility aids designed to reduce fatigue and improve productivity.

The crane maintains compact transport dimensions despite its impressive lifting performance. Overall length is 9.8 m, width is 2.62 m, and overall height is 3.595 m. Gross vehicle weight is approximately 27.9 tonnes, evenly distributed between the front and rear axles. These dimensions allow the MR-350RfII to balance transportability, maneuverability, and lifting capability effectively.

The MR-350RfII’s most notable innovation is its hydraulically telescoping and luffing SL Jib. Unlike conventional fixed fly jibs, the operator can vary the jib angle hydraulically while working, providing precise load placement in locations that would otherwise require crane repositioning. Combined with a six-section SuperBoom, compact 2.85 m tail swing radius, and advanced ACS control system, the MR-350RfII delivers exceptional versatility for urban and industrial lifting applications while remaining one of the most compact cranes in the 35-ton rough terrain class.