LY25BT harbor crane is the product that is technology comes from IHI Construction Machinery Ltd. Of Japan, and manufactured under the license of IHI. It is a 25t heavy duty mobile crane with fully hydraulic power drive, lattice boom and continuous 360 full circle swing, specially designed for harbor working conditions.
The crane equipped with a one-man cab mounted on the superstructure, and designed for high performance of crane operation, convenient controls, sturdy and durable. The lattice boom is modified according to heavy duty operation, and has a high stability and travel performance. All of the main components are imported, including engine, pumps, motors, valves, clutch, brakes and components of air circuit and electric system.
Two variable displacement pumps and three gear pumps are driven by a water cooled six-cylinder diesel engine, providing hydraulic power for crane operation and control system. Hoist, derricking and swing are driven separately by its hydraulic motor through gear box. They can be operated independently or combined operation. The hoist winch is controlled by power fall or free fall to increase productivity.
The driven type of carrier is 4*2 with front axle as steering axle and rear axle as driving. A variable piston motor propels the rear axle through two-stage gear reducer, so the crane has a high gradeability.
The control center is in the crane cab which is located on superstructure. All crane movements are controlled by the pilot valves in the control center. Either single movement or combined movements are available.
For safety reason, all the crane operation should be under control of Automatic Moment Limiter which shows boom length, boom angle, working radius and lifting load, and will cut out the crane motions before overload. ALL the control levers, pedals, switches and pressure gauges are in the control center.
H-type outriggers can be controlled in the crane cab. Either extension beams or jacks can be controlled independently.
Max. rated capacity
25,000kg at 3.6 m
Lattice type ,high strength welding tube structure insert sections 3 or 6m each to from 9 to 24m
Driven by fixed displacement axial piston motor through planetary gear box with power fall control
Single row ball bearing Swing with free /lock switch
Max. unloaded 3.8r/min
Working speed With outriggers ≤ 2.0rpm
Without outriggers ≤ 1.8rpm
11s (9m boom,unloaded,from40 degree to 60 degree)
12s (radius 9m to 3.6m)
Boom support wire
Pilot control valve for combined hoisting ,derricking and swing movement
Large hydraulic tank with oil cooling system
H-type controlled in the crane cab
Full extension 58s Full retraction 40s
Longitudinal span 6 m Extended width 6 m
Air condition, auxiliary winch, emergency steering, boom sections for 27 m and 30 m boom
Rated output 197Ps at 2100rpm
Max. torque 814 Nm at 1500 rpm
Manufacture Cummins UK
Two variable displacement pumps in tandem and three gear pumps
Max. travelling speed
High speed 3° Low speed 14°
Min. turning radius
9m (at central line of front outside steering wheel)
30,900kg(traveling position with 9 m boom and hook block)
Boom over winding cutout, boom back stops, safety latch
Hoist over winding cutout, boom back stops, safety latch
Automatic moment limiter
Man unit in crane gives audible and visual warning of approach to overload. Automatically cuts out crane motions before overload. With working range load radius and or tip height limit function. Digital liquid crystal displayed: Load moment in % Actual hook load Permissible load Boom angle Actual working radius Boom length