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K4 heavy duty grab crane


K4 Heavy duty grab crane


K4 electro-hydraulic four-rope grab crane for heavy duty operation


Crane type

K4 electro-hydraulic four-rope grab cranes for operation with mechanical grabs are self-contained units with all machinery enclosed in the crane housing. This protects them from dust, weather, corrosion and damage.

The heavy duty K4 covers lifting capacities 30 and 50 tonnes in grab operation, with outreaches up to 36m.

To further improve outreach, cycle time and positioning performance, the crane can be installed on an eccentric platform.

Each crane is tested electrically, hydraulically and mechanically before delivery. 

General design

K4 cranes are designed to meet the rules of all recognised classification societies.

The MacGregor control system ensures smooth, fast and stepless crane control. Hoisting, luffing and slewing motions are independent of each other. This means that at their maximum capacity, K4 cranes can operate at full speed using all three movements at the same time.

K4 crane design is calculated according to the latest FEM rules, 1.001.

For K4 heavy-duty units, where U7-A8-Q3 applies to the whole crane, this equates to:

Up to 2,000,000 hoisting cycles during the lifetime of the crane up to 5,000 working hours/year.  

Crane details

 • Hoisting capacity: 30-50t in grab operation and 32.5-52.5t in hook operation
• Jib radius: 26-36m
• Hoisting speed: 50-80m/min

Important crane criteria

• FEM-rules, 1.001
• FEM-Class U7-A8-Q3
• Extra high capacity, tonne/hours
• Extra high speed
• Positioning performance
• Operator convenience
• Robust design


• Closed hydraulic system; all motions are available at the same time at full speed and load
• Low power consumption
• Planetary gears and hydraulic motors with fail-safe brakes

Control system

• Excellent and optimised control
• Individual adjustment possibilities
• Enhanced monitoring capabilities
• Integrated diagnostic functions

Available extras

• Logging
• Camera on jib top
• Automatic greasing of slewing bearing
• Increased speeds for K50
• SeaState selector 


Product type