Kato SL-850RfIII Load Chart PDF + Specifications

The Kato SL-850RfIII represents one of the largest members of Kato’s innovative SL-series rough terrain crane family. The designation “SL” refers to the crane’s hydraulically operated telescopic and luffing jib system, a feature that distinguishes it from conventional rough terrain cranes fitted with manually assembled lattice fly jibs. This design allows operators to extend, retract, and adjust the jib angle directly from the cab, reducing assembly time and increasing operational flexibility when working around structures and obstacles. The crane belongs to the 80-ton lifting class and is designed to provide lifting performance approaching larger all-terrain cranes while retaining the compact dimensions and mobility advantages of a rough terrain carrier.

The main boom is a six-section fully hydraulic box-type boom extending from 10.0 m to 45.0 m. The telescoping arrangement utilizes synchronized extension, with the second and third sections extending simultaneously and the fourth, fifth, and sixth sections extending together. Maximum rated capacity is 80,000 kg at a 2.2 m working radius on the 10.0 m boom using 20-part reeving within a limited forward working zone. Additional capacities include 40 tonnes on the 13.0 m and 17.0 m boom lengths, 38 tonnes on the 20.0 m boom, 35 tonnes on the 24.0 m boom, 14 tonnes on the 31.0 m boom, 13 tonnes on the 38.0 m boom, 10.2 tonnes on the 42.0 m boom, and 8.2 tonnes on the fully extended 45.0 m boom. Maximum boom tip height reaches 46.0 m.

A major feature of the SL-850RfIII is the three-section hydraulic SL Jib. The jib telescopes from 9.52 m to 18.0 m and can be hydraulically luffed between 5° and 60°. Rated lifting capacities are 4.2 tonnes on the 9.52 m jib, 2.8 tonnes on the 13.8 m jib, and 1.8 tonnes on the fully extended 18.0 m jib. Combined with the 45.0 m boom, the crane achieves a maximum lifting height of 64.0 m. This configuration enables the crane to handle tower crane erection, industrial structures, telecommunications work, refinery maintenance, and lifting operations over buildings where additional outreach is required.

The hoisting system consists of dual independent hydraulic winches powered through planetary reduction gearboxes with integrated negative brakes. Main hoist rope speed reaches 130 m/min while auxiliary hoist speed reaches 120 m/min. Under no-load conditions, high-speed lowering reaches approximately 157 m/min. Main hook lifting speed is 6.0 m/min with 20-part reeving and auxiliary hook speed reaches 120 m/min on a single line. A 5.6-ton rooster sheave is also provided for lighter lifting duties.

Boom luffing ranges from 0° to 84°. Raising the boom from horizontal to maximum elevation requires approximately 63 seconds, while extending the full 35 m telescoping stroke requires approximately 125 seconds. Slewing is driven by a hydraulic motor through a planetary reduction gearbox with high- and low-speed selection. Maximum slewing speed is 1.85 rpm. Rear swing radius is only 3.55 m without counterweight and 3.90 m with the optional counterweight installed, allowing operation in congested urban environments.

The outrigger system uses a fully hydraulic H-type arrangement with integrated vertical cylinders and floats. Six outrigger widths are available: 7.6 m, 7.2 m, 6.5 m, 5.4 m, 4.3 m, and 2.55 m. Separate load charts are provided for each outrigger extension position, maximizing flexibility on restricted jobsites where full deployment is not possible.

Power is supplied by a Cummins QSL9-4C turbocharged diesel engine meeting Japan’s 2014 special vehicle emissions regulations. The six-cylinder, four-stroke, water-cooled direct-injection engine displaces 8.849 litres and produces 246 kW (330 hp) at 2,000 rpm. Maximum torque is 1,636 Nm at 1,100 rpm. The engine is paired with a fully automatic transmission with manual shifting capability, six forward speeds, and two reverse speeds. A torque converter with automatic lock-up clutch improves travel efficiency and gradeability.

The carrier utilizes Kato’s YDS-KRC030 four-axle chassis. Drive modes can be selected between 8×4 and 8×6 configurations depending on site conditions. Maximum travel speed is 49 km/h and gradeability reaches approximately 53%. Five steering modes are available, including front-wheel steering, rear-wheel steering, crab steering, counter steering, and independent steering. Minimum turning radius is only 7.4 m in eight-wheel steering mode, giving the crane excellent maneuverability in confined areas.

Safety systems are centered around Kato’s ACS (Automatic Crane System) overload prevention system with voice alarms and automatic slewing stop. Additional equipment includes anti-two-block protection, work area limitation system, boom extension and boom lowering slow-stop functions, electronic level indicator with outrigger leveling assistance, automatic outrigger width detection, winch protection systems, boom and jib lowering prevention devices, swing lock, outrigger lock, and hook latch protection. Depending on specification level, the crane may also be equipped with Kato’s Safety View System, which incorporates human detection assistance, surround-view cameras, a 12.1-inch touchscreen monitor, PDF display capability, and a clearance sonar system.

Operator comfort is enhanced through a liquid-mounted cab, automatic climate control with dehumidification, full-adjustment suspension seat, armrests, headrest, power windows, front and roof wipers, USB power outlets, LED work lights, winch monitoring camera, lunch table, Bluetooth audio system, and various visibility aids. The Safety View System further improves operator awareness in busy construction environments.

Overall dimensions are 12.99 m long, 2.85 m wide, and 3.75 m high. Wheelbase is 7.0 m and gross vehicle weight is approximately 41.2 tonnes without counterweight. An optional 5-tonne counterweight increases operational lifting performance while maintaining transport flexibility. The crane cannot travel on public roads with the counterweight installed.

The SL-850RfIII’s most notable innovation is its hydraulically telescoping and luffing SL Jib, allowing jib deployment and angle adjustment entirely from the operator’s cab. Combined with an 80-ton lifting capacity, optional 5-tonne counterweight, maximum lifting height of 64 m, advanced ACS load management system, optional Safety View System with human detection technology, and a compact four-axle carrier powered by the Cummins QSL9 engine, the crane delivers a highly versatile lifting solution for both infrastructure and industrial projects.