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Marine Knuckle Boom Crane
Model KMU 2TX8M

Knuckle boom cranes represent the most versatile and compact type of deck cranes. The folding boom design, equipped with telescopic sections, allows for maximum workspace coverage and enables lifting operations that are beyond the reach of other crane types.

This equipment is supplied in a wide range of configurations, differing in the number of telescopic sections, lifting capacity, and control options. This approach ensures the crane design is optimally tailored to meet specific customer requirements.

The KMU 2TX8M model features a three-section telescopic boom with an outreach ranging from 2 to 8 m. This design ensures stable and reliable operation when handling loads ranging from 2 to 3 t. Additional advantages of the model include continuous 360° slewing and a remote control pendant, significantly enhancing operational convenience and efficiency.

Configuration

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Base

Base

(highlighted in blue)

The robust welded base provides secure mounting of the crane slewing system. The structure is bolted to a 1.5 m high ship foundation, ensuring operational stability and safety.

Slewing system

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The driven slewing system enables continuous 360° crane rotation. The system integrates a gearbox, brake, and hydraulic motor, ensuring precise positioning and reliable operation.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Slewing System
Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Column

Column

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The robust welded column is mounted on the slewing system and serves as the primary support for the luffing section and hydraulic cylinder, ensuring overall structural stability.

Luffing section hydraulic cylinder

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The luffing section hydraulic cylinder ensures precise adjustment of the boom outreach. Equipped with a counterbalance valve, it ensures reliable load holding under all operating conditions, including lateral loads. Manual operation of the counterbalance valve allows safe emergency lowering of the boom under its own weight in the event of power loss.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Luffing Section Hydraulic Cylinder
Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Luffing Section

Luffing section

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The luffing section enables folding of the crane into its stowed position, adjustment of the boom outreach, and ensures maximum lifting height. It is articulated to the column and serves as the mounting base for the hydraulic cylinder, telescopic section, and telescopic extension cylinder.

Telescopic section extension cylinder

(highlighted in blue)

The telescopic section extension cylinder ensures boom outreach adjustment and deploys the crane into its operating position. Equipped with a counterbalance valve, it ensures reliable load holding under all operating conditions, including lateral loads. Manual operation of the counterbalance valve allows safe emergency lowering of the boom under its own weight in the event of power loss.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Telescopic Section Extenion Cylinder
Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Telescopic Sections

Telescopic sections

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The three-section telescopic design (one fixed section and two movable sections) provides adjustment of outreach and hook lifting height. Dedicated mounts for two hydraulic cylinders ensure precise and reliable extension of the sections.

Telescopic section cylinders

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The hydraulic cylinders provide sequential and reliable extension of the telescopic sections. The cylinder design with counterbalance valves ensures safe load holding in emergency and abnormal operating conditions.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Telescopic Section Cylinders
Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Winch

Winch

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The winch equipped with a geared motor and a normally closed brake provides safe hoisting operation. The design includes a pressure roller for proper wire rope spooling and a rope payout limit switch, ensuring reliable operation.

Hook block

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The hook block ensures secure load attachment via a wire rope thimble and a hook equipped with a safety latch and swivel. The robust structure ensures durability and operational safety.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Hook Block
Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Operator Platform

Operator platform

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The operator platform, featuring an integrated local control station, is rigidly mounted on the crane column. The platform includes guardrails and an access ladder, ensuring safe and convenient working conditions.

Control station

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The local control station mounted on the slewing column provides direct control of all crane operating movements via hydraulic control valve levers and pushbuttons. An integrated control cabinet with a PLC ensures precise and reliable operation.

Marine Knuckle Boom Crane Model KMU 2TX8M 3D Model Control Station

Standard configuration and options

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Standard configuration:

  • Column
  • Boom assembly
  • Platforms (set)
  • Winch with wire rope
  • Boom luffing hydraulic cylinder(s)
  • Hook block
  • Hydraulic power unit (HPU)
  • Electrical equipment
  • Hydraulic equipment
  • Local control station

Optional:

  • Cranes may be supplied without a column or with a column height customized to the customer’s requirements
  • Cranes may be supplied with an integrated HPU, a remote HPU, or without an HPU
  • Local (operator cabin or platform), remote (pendant or radio control), or combined control
  • Explosion-proof (tanker) design
  • Man-riding design
  • For explosive cargo handling
  • Auxiliary hoisting winches
  • Heave compensation
  • Floodlights
  • Custom paint color

Documentation:

The following documentation provided with the crane:

DocumentQuantity
Product Data Sheet1
Installation and Operation Manual1
Onboard Test Program and Methodology1
Factory Acceptance Test (FAT) Report1
Spare Parts and Tools List1

3D crane simulation

About

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Next-Generation Marine Lifting Equipment

In today’s shipbuilding industry, solutions that combine compact design, functionality, and engineering precision are increasingly prevalent. One such solution is the marine knuckle boom crane — equipment that has redefined the approach to cargo handling at sea. It is designed as part of an integrated system, where every second of operation and every square meter of deck space matters.

Engineering Shaped by the Sea

On board a vessel, nothing is incidental. Every component installed on deck must not only be robust, but also capable of withstanding prolonged exposure to saltwater, wind, and hull-induced vibrations. The marine knuckle boom crane is engineered with these factors in mind: beyond lifting capacity and maneuverability, it must reliably adapt to changing sea states and vessel motion. Structural solutions are therefore designed to maintain stability even under complex vessel dynamics.

Transforming Operational Workflows

Where cargo handling once required large crews and time-consuming preparation, today a few precise control lever movements are sufficient. The crane does more than just lift cargo — it becomes an integral part of the vessel’s onboard logistics, streamlining supply, loading, and transshipment operations. High positioning accuracy minimizes the risk of cargo damage and enhances operational safety.

Manufacturing Focused on Marine Applications

The development of such systems demands a deep understanding of marine operating conditions. Izhora Hydrosystems LLC specializes in manufacturing lifting equipment that not only complies with industry standards, but also sets new standards in marine lifting applications. The engineering solutions are designed for long-term operation with minimal maintenance requirements, a critical factor for vessels operating in remote environments.

When Functionality Becomes a Strategic Advantage

The true value of a modern marine knuckle boom crane goes beyond mechanics. It enables the crew to operate faster, more accurately and safely. It is an essential part of marine logistics.

Dimensions

Marine Knuckle Boom Crane 2t8m Drawing

Technical specifications

ParameterValue
Safe Working Load (SWL),
min., kg
max.,kg

2000 kg; (at 8 m outreach)
3000 kg; (at 5.2 m outreach)
Boom outreach, m 2 m…8 m
Hoisting / lowering speed, m/min≥ 10 m/min
Lowering depth, mup to 25 m
Winch drive typeHydraulic
Slewing angle, °360° continuous
Slewing speed (no load), rpm≥ 1 rpm
Crane controlLocal control station (on the slewing column) + remote control pendant (wired)
Power supply3-phase, 380 V, 50 Hz
Crane weight, kg5200 kg
Operating conditions— Ambient temperature: –30 °C to +25 °C
— Heel: up to 5° (either side)
— Trim: up to 2° (bow or stern)
— Wind pressure ≤ 400 Pa
— Vessel-induced vibrations
Operating conditions (Stowed Position)— Ambient temperature: –40 °C to +45 °C
— Heel: up to 15° (either side)
— Trim: up to 5° (bow or stern)
— Wind pressure ≤ 2000 Pa
— Vessel-induced vibrations

General requirements and standards

  • All electrical equipment is rated IP56.
  • All materials are suitable for operation within the temperature range of –30 °C to +25 °C.
  • Winter lay-up temperature: –40 °C.
  • The paint scheme and color shall be agreed with the Customer.
  • Preservation coatings provide an indoor storage life of 12–18 months.
  • Hydraulic system working fluid: AUP (in accordance with applicable national standards).
  • Working fluid cleanliness class in accordance with GOST 17216-71: not less than Class 12.
  • Power supply cables are provided with mating connectors.
  • The equipment is supplied with certificates issued by the Russian Maritime Register of Shipping (RS), confirming operability at –30 °C without additional heating.
  • The equipment is supplied in packaging suitable for both crane and forklift handling, road transportation, and outdoor sheltered storage.
  • Design documentation, in the scope agreed with the Customer’s Designer, shall be provided upon execution of the supply contract:
    • General Arrangement (GA) drawings indicating connection point coordinates;
    • Dimensions of support surfaces, installation requirements, and foundation loads;
    • 3D model of the equipment (.stp format);
    • Spare Parts and Tools List indicating quantities, crate dimensions, and weights;
    • List of measuring and inspection equipment;
    • List of measuring instruments with specifying accuracy and calibration intervals;
    • Mooring and sea trials program and procedures;
    • Operation manual.

Regulatory compliance

The equipment complies with the following requirements:

  • General Regulations of the Russian Maritime Register of Shipping (RS);
  • Technical Regulation on the Safety of Maritime Transport (Decree of the Government of the Russian Federation No. 620 dated August 12, 2010);
  • SP 2.5.3650-20 (Sanitary and Epidemiological Requirements for Transport);
  • Other applicable requirements of Russian legislation, including sanitary and veterinary regulations, occupational health and safety requirements, and industrial safety requirements;
  • The equipment also complies with all amendments and supplements in force as of the vessel’s keel-laying date (Decree of the Government of the Russian Federation No. 719);
  • Supervision of installation and commissioning services;
  • Confirmation of industrial product manufacturing within the territory of the Russian Federation (Decree of the Government of the Russian Federation No. 719 dated July 17, 2015).