Sany STC550T6 Load Chart PDF + Specifications

The Sany STC550T6 represents a matured 55-ton class truck crane platform designed for infrastructure construction, industrial installation, and general building projects. According to the official technical documentation , the crane features a six-section telescopic main boom manufactured from high-strength structural steel with a large oval cross-section. The boom length ranges from 11.8 meters in its basic configuration to 52 meters fully extended. When equipped with the 16-meter lattice jib, the maximum lifting height reaches 68 meters, providing extended reach for elevated lifting applications.

The maximum rated lifting capacity is 55 tons, with a maximum lifting moment of 2,107 kN·m on the basic boom and 1,078 kN·m on the fully extended main boom. The outrigger span measures 7.4 meters transversely and 6.13 meters longitudinally, ensuring stable 360-degree lifting performance. The tail slewing radius is 3.985 meters, supporting efficient maneuverability within confined job sites.

The hoisting system utilizes dual-variable pump and motor control, providing smooth and efficient lifting operations. The main and auxiliary winches both achieve a maximum single-line speed of 145 m/min. The main hoist rope specification is 18 mm diameter with 240 meters length, while the auxiliary hoist uses 18 mm rope with 155 meters length. Maximum single-line pull is rated at 5 tons. Full boom extension and retraction times are 380 and 360 seconds respectively, while luffing time ranges from 70 seconds up to 80° and 90 seconds for lowering. Slewing speed ranges from 0 to 1.8 rpm .

The counterweight configuration totals 10.5 tons, consisting of modular counterweight sections for operational flexibility. The luffing angle ranges from –2° to 80°, supporting versatile working conditions.

The carrier adopts an 8×4 drive configuration with a 2.8-meter-wide reinforced chassis frame. The crane’s overall dimensions are 14,240 mm in length, 2,800 mm in width, and 3,820 mm in height, with a gross vehicle weight of 44,000 kg. Axle load distribution is 9 tons on axles 1 and 2, and 13 tons on axles 3 and 4 .

Power is provided by a Weichai WP10.375E53 inline six-cylinder diesel engine compliant with China V emission standards. The engine delivers 276 kW at 1,900 rpm and a maximum torque of 1,650 N·m between 1,200 and 1,600 rpm. The drivetrain includes a 10-speed manual transmission with synchronizers, optimized for both low-speed site maneuvering and highway travel. Maximum travel speed reaches 90 km/h, minimum turning radius is 12 meters, and maximum gradeability is 47%. Fuel consumption is rated at ≤40 L/100 km under economic driving conditions .

The suspension system combines front steel leaf springs with rear rubber suspension to balance durability and ride comfort. Braking is achieved through a dual-circuit air brake system with wedge-type front axle brakes and integrated exhaust brake for auxiliary braking, enhancing safety during downhill travel.

The operator’s cab is a newly developed wide-body design, tiltable from 0° to 20°, featuring a 10.4-inch touchscreen display, membrane-type control switches, ergonomic seating, and a three-dimensional air conditioning system. The control system incorporates an intelligent load moment limiter, height limiters, three-circle winch protection devices, and comprehensive sensor monitoring to ensure operational safety.

Overall, the Sany STC550T6 offers a combination of a 52-meter six-section boom, 2,107 kN·m lifting moment, 10.5-ton counterweight package, and a 276 kW China V powertrain. Its balanced structural design, efficient hydraulic system, and reinforced G-class chassis position it as a competitive 55-ton hydraulic truck crane suitable for diverse construction and lifting applications.