Kato SL-250RV Load Chart PDF + Specifications

The SL-250RV, designated KR-25H-FV, represents one of Kato’s most versatile 25-ton rough terrain cranes. While it shares the same basic carrier and upper structure architecture as the standard SR-250 series, the defining feature of the SL-250RV is its SL Jib (Super Luffing Jib) system. Unlike conventional lattice or fixed-angle fly jibs, the SL Jib is a hydraulically telescoping box-section attachment that can be adjusted through offset angles ranging from 5° to 60°, allowing operators to position loads in locations that would otherwise require crane relocation. This capability makes the crane particularly valuable for urban construction, rooftop installations, industrial plant work, and projects where surrounding structures restrict crane positioning.

The main boom is a four-section synchronized telescopic box boom extending from 9.35 m to 30.5 m. Maximum rated lifting capacity is 25 tonnes at a 3.5 m radius on the shortest boom using seven-part reeving. Capacities remain strong throughout the boom range, with 15 tonnes available on the 16.4 m boom, 12.5 tonnes on the 23.45 m boom, and 8 tonnes on the fully extended 30.5 m boom. A 4.5-ton rooster sheave is also fitted for auxiliary lifting applications and single-line hook operations.

The crane’s SL Jib system is the primary distinguishing feature. The hydraulically telescoping jib can be configured at lengths of 8.8 m or 13.2 m and can be hydraulically luffed through offsets of 5°, 25°, 45°, and 60°. Maximum jib capacities are 3.3 tonnes on the 8.8 m configuration and 2.2 tonnes on the 13.2 m configuration. With the 30.5 m main boom fully extended and the 13.2 m SL Jib installed, the crane achieves a maximum hook height of 44.7 m. This combination allows precise load placement behind obstacles, inside structures, or onto elevated roofs without repositioning the carrier.

The lifting system utilizes twin hydraulic winches driven through planetary reduction gearboxes with integrated negative brakes. Both the main and auxiliary winches provide rope speeds of up to 125 m/min, while the high-speed no-load lowering system reaches 163 m/min. Hook speeds reach 17.8 m/min with the seven-part main hook arrangement and 125 m/min with the single-line auxiliary hook. These figures ensure rapid lifting cycles and efficient operation during repetitive construction tasks.

Boom elevation ranges from 0° to 84°, with full luffing completed in approximately 40 seconds. The boom extends through a 21.15 m telescoping stroke in approximately 65 seconds. Slewing is powered by a hydraulic motor through a planetary gearbox and provides a maximum slewing speed of 2.6 rpm. The rear swing radius is maintained at only 3.1 m, allowing operation in congested job sites where space behind the crane is limited.

The outrigger system is available in either H-type or X-type configuration. The H-type arrangement offers five extension positions, including maximum extension at 6.6 m, intermediate spreads of 6.1 m, 5.0 m, and 3.8 m, and a minimum spread of 2.31 m. The crane’s load charts are optimized for each outrigger position, allowing useful lifting capacities even when full deployment is impossible.

Power is supplied by a Hino J08E turbocharged diesel engine meeting Japan’s 2014 emissions regulations for special-purpose vehicles. The six-cylinder direct-injection engine develops 196 kW (263 hp) at 2,300 rpm and 830 Nm of torque at 1,600 rpm from a displacement of 7.684 litres. The engine is coupled to a torque-converter transmission offering fully automatic and manual operation with three forward gears, one reverse gear, and Hi/Low range selection.

Travel performance remains typical of Kato’s modern rough terrain crane lineup. Maximum road speed is 49 km/h, while gradeability reaches approximately 57%. The drivetrain can be switched between 4×2 and 4×4 operation depending on site conditions. Steering flexibility is enhanced through five steering modes consisting of front-wheel steering, rear-wheel steering, counter steering, crab steering, and independent steering. The minimum turning radius is only 5.1 m in four-wheel steering mode, making the crane highly maneuverable in restricted work areas.

Safety equipment is extensive and includes Kato’s ACS (Automatic Crane System) with overload protection, voice warning system, automatic swing stop, work-area limitation functions, anti-two-block protection, outrigger-width detection, electronic level indicator with outrigger leveling assistance, hydraulic safety valves, boom and jib lowering protection devices, winch braking systems, swing locks, and outrigger locking mechanisms. The carrier is further equipped with multiple cameras covering the left, right, rear, and upper structure, as well as human detection assistance and clearance sonar systems.

Operator comfort has received considerable attention. The cab includes automatic climate control with dehumidification, a fully adjustable suspension seat with heating, Bluetooth-enabled AM/FM radio, telematics system, USB charging ports, LED interior lighting, power windows, and numerous visibility enhancements. These features help reduce operator fatigue and improve productivity during long working shifts.

With an overall length of 11.47 m, width of 2.62 m, and height of 3.49 m, the SL-250RV remains compact for transport while offering exceptional reach and flexibility. Gross vehicle weight is approximately 25.5 tonnes with balanced axle loading, allowing practical transportation between construction sites and industrial facilities.