Zoomlion ZRT850 Load Chart PDF + Specifications

The Zoomlion ZRT850 was introduced as a modern 85-ton rough terrain crane aimed at providing a balance between high lifting capacity, long boom reach, and strong off-road mobility. The crane was developed primarily for petrochemical construction, refinery shutdown maintenance, industrial plant erection, infrastructure development, and heavy lifting applications where compact dimensions and terrain adaptability are critical.

A key feature of the ZRT850 is its five-section fully synchronized telescopic boom manufactured from high-strength steel using a U-shaped boom profile. The boom extends hydraulically from 11.2 meters to 47 meters and incorporates dual extension cylinders together with extension cables for synchronized boom movement. The boom head is fitted with four 22 mm reeving sheaves and removable dead-end provisions on both sides of the boom head, simplifying reeving changes and hook block configuration. Boom elevation ranges from -2° to 80°, allowing the crane to perform low-radius heavy lifts as well as high-angle lifting operations. Full boom extension and retraction requires approximately 130 seconds, while boom raising and lowering takes around 45 and 105 seconds respectively.

For additional lifting height and outreach, the crane can be equipped with a two-stage swing-away lattice jib with hydraulic offset capability. The jib length ranges from 9.5 meters to 16 meters and supports offset angles of 0°, 15°, and 30°. With the jib installed, the crane achieves a maximum lifting height of approximately 65.7 meters. The jib can be side-stowed alongside the boom during transportation and rapidly deployed on site.

The ZRT850 has a maximum rated lifting capacity of 85 tonnes and develops a maximum lifting moment of approximately 121 tonne-meters. The crane maintains strong lifting performance throughout the boom range and supports multiple operating configurations including fully extended outriggers, half-extended outriggers, fully retracted outriggers, and lifting-on-tires operations. The extensive lifting charts included in the specification manual demonstrate the crane’s flexibility for restricted site conditions and varying stability requirements.

The hoisting system uses standard dual-speed hydraulic main and auxiliary winches equipped with planetary reduction gearboxes and spring-applied multi-disc brakes. Both winches feature grooved drum lagging for improved rope management. Maximum single-line rope speed reaches approximately 130 meters per minute while maximum single-line pull is rated at approximately 6,500 kg. The crane uses 20 mm rotation-resistant compacted strand wire rope. Hook equipment includes optional 85-ton six-sheave hook blocks, optional 70-ton five-sheave hook blocks, a standard 35-ton three-sheave hook block, and a 6.5-ton hook ball.

Power for the crane is supplied by a Cummins QSB6.7 turbocharged inline six-cylinder diesel engine producing approximately 194 kW at 2,400 rpm with maximum torque output of around 990 Nm at 1,500 rpm. The engine complies with various emission standards depending on market configuration, including US Federal EPA, California ARB, European EU, and Tier III regulations. Power is transmitted through a DANA powershift transmission with six forward and three reverse speeds. The crane achieves maximum traveling speeds of approximately 36 km/h and offers gradeability up to 75%, providing strong mobility on steep or rough terrain.

The carrier chassis uses heavy-duty front and rear steering axles with planetary reduction hubs. The rear axle incorporates a floating arrangement with automatic oscillation lockout when the superstructure slews more than 10° from the centerline. Four steering modes are available including front-wheel steering, rear-wheel steering, coordinated four-wheel steering, and crab steering. These steering modes greatly improve maneuverability in confined industrial facilities and congested jobsites. The crane is fitted with 29.5-25-34PR earthmover-type tires mounted on steel disc wheels.

The outrigger system consists of four independently controlled hydraulic outriggers with integrated holding valves for safety during lifting operations. Outriggers can be positioned fully extended, half extended, or fully retracted depending on site restrictions and lifting requirements. Maximum outrigger footprint reaches approximately 7.38 meters longitudinally and 7.30 meters laterally when fully extended. Hydraulic locking systems improve stability and operational safety during lifting.

The hydraulic system uses dedicated gear pumps for steering, swing functions, outriggers, and boom operations. Hydraulic oil is stored in a 1,000-liter reservoir equipped with internal sight and temperature gauges. The system includes full-flow filtration with bypass protection and operates at maximum pressure of approximately 31.5 MPa. The slewing mechanism consists of a bi-directional hydraulic swing motor with planetary reduction gearbox and spring-applied hydraulic release swing brake. Maximum slewing speed reaches approximately 2 rpm with continuous 360° rotation capability.

Operator comfort and safety were major priorities in the ZRT850 design. The full-vision operator cab uses all-steel construction with acoustical lining and safety glass throughout. The cab can slide open on the left side and features a swing-up skylight for improved visibility during high-angle lifting operations. Interior equipment includes hydraulic joystick controls, adjustable deluxe seating, climate control air conditioning, electronic monitoring displays, and ergonomic control layouts. The crane is equipped with Zoomlion’s WIDE MCS-570 load moment indicator system featuring graphical load monitoring, anti-two-block protection, boom configuration displays, radius indication, and allowable load calculations. Additional safety devices include swing locks, hydraulic safety valves, emergency stop controls, and outrigger monitoring systems.