Marine Stiff Boom Crane


About product

A stiff boom crane is a type of crane specifically designed for general cargo handling and service operations aboard ships and offshore units. These cranes offer efficient and reliable lifting capabilities, making them well-suited for marine environments.

Marine stiff boom cranes are available in a range of configurations to meet varying customer requirements. They can be customized in terms of lifting capacity, reach, and other features to ensure optimal performance for specific applications. This flexibility allows them to handle different types of cargo and equipment effectively.

Additional information

Safety Load

10Kn – 300Kn

Using Environment

Dock, Deck, Fixing Installations, Harbors

Product Detail

Components Of Stiff Boom Crane

The stiff boom crane comprises three distinct components, each serving a specific function:

  • Hoisting Mechanism:
    • Hydraulic winch: Provides the lifting power by winding and unwinding the hoisting wire rope.
    • Hoisting wire rope: The primary lifting element that carries the load during operations.
    • Pulley: Guides and redirects the hoisting wire rope, ensuring smooth and controlled lifting.
  • Slewing Mechanism:
    • Slewing hydraulic system: Enables the crane to rotate a full 360 degrees.
    • Slewing support device: Facilitates the smooth and controlled rotation of the crane.
    • Slewing reducer: Controls the rotational speed, typically ranging from 0.5-1.5 revolutions per minute (r/min).
  • Luffing Mechanism:
    • Luffing cylinder: Responsible for adjusting the angle of the boom, allowing for vertical movement.
    • Luffing hydraulic system: Powers the luffing cylinder and controls the luffing motion.
    • Luffing range: Typically adjustable between 0° and 75°, providing flexibility in lifting operations.

 Safety Considerations for Stiff Boom Crane Operation

When operating a stiff boom marine deck crane, it is imperative to prioritize safety, particularly in relation to sea surface conditions. Two critical parameters to consider are the trim (Tirm) of the hull and the heel of the vessel. Adhering to specific guidelines for these parameters is essential to maintain stability and prevent excessive tilting, ensuring safe and efficient crane operations.

  • Trim (Tirm) of the Hull:
    • Definition: Trim refers to the longitudinal balance of the vessel in relation to the waterline.
    • Importance: Keeping the hull’s trim at or below 2° is crucial to maintain stability during crane operations.
    • Stability Considerations: Excessive trim can lead to uneven weight distribution, affecting the crane’s performance and potentially compromising the vessel’s stability.
    • Monitoring and Adjustment: Regular monitoring of the hull’s trim and making necessary adjustments through ballasting or load distribution is vital for safe crane operation.
  • Heel:
    • Definition: Heel refers to the lateral inclination or tilting of the vessel.
    • Importance: Maintaining the heel at or below 5° is essential to prevent excessive tilting, which can impact the crane’s stability and compromise safety.
    • Factors Affecting Heel: Sea conditions, cargo distribution, and crane operations can influence the vessel’s heel.
    • Stability Management: Monitoring the vessel’s heel and employing proper ballasting techniques or load adjustments can help maintain a safe operating range.

Problems, Reasons, And Solutions Of Stiff Boom Crane

Stiff boom cranes are powerful and versatile machines used in various industries for lifting and moving heavy loads. However, like any complex equipment, they can encounter problems that hinder their performance and efficiency. Understanding the common problems, their underlying reasons, and the appropriate solutions is essential for ensuring smooth and safe crane operations. Let’s explore some of the typical issues that can arise with stiff boom cranes and delve into their causes and solutions.

Unit not starting after the oil pump, system lacks oil pressureSuction tubing clogging or fuel tank leakage: Obstructing the fuel flow or causing low oil level.
Back pressure valve pressure too low: Insufficient pressure in the system.
Motor wiring misconfiguration: Incorrect wiring leading to reverse motor running.
Clear any clogs in the suction tubing or repair fuel tank leaks.
Refuel the system to ensure adequate oil level.
Adjust the back pressure valve to the specified value to maintain sufficient pressure.
Verify and adjust the motor wiring to the correct configuration.
Steering action not functioning properly in the servosElectromagnet not activating: Impairing the action of the servos.
Solenoid valve mounted in reverse direction: Incorrect installation causing reversed operation.
Clean or replace the electromagnet to ensure proper activation.
Correct the installation of the solenoid valve, ensuring it is mounted in the correct direction.
The oil pump and coupling temperature is too high, excessive oil in the system.Adverse connectivity: Poor connections leading to increased friction and heat.
High oil viscosity and oil dirtiness: Hindering smooth oil flow and causing overheating.
Low oil pump efficiency: Ineffective pumping leading to increased temperature.
Tight seals in the push rudder pressure cylinder: Excessive friction generating heat.
High oil level in the tank: Overfilled tank restricting heat dissipation.
High ambient temperature: External factors contributing to increased temperature.
Dirty tank surface: Reduced heat dissipation due to poor cleanliness.
Not all valves are open: Insufficient flow causing oil to accumulate and overheat.
High pressure in the back pressure valve and system: Excessive pressure generating heat.
Check and adjust the motor and pump connections to ensure proper alignment and reduced friction.
Clean or replace the oil to improve viscosity and remove dirt particles.
Replace the pump if it is inefficient and causing excessive heating.
Relax the seals in the push rudder pressure cylinder to reduce friction.
Adjust the oil level in the tank according to regulations for optimal heat dissipation.
Improve the environmental temperature or implement cooling measures in the working area.
Maintain a clean appearance of the fuel tank to promote efficient heat dissipation.
Ensure all valves are open to allow proper oil flow and prevent overheating.
Check and adjust the back pressure valve and system pressure to the specified values.
Resize valves, PINs, and bushings to the specified values for improved performance and reduced heat generation.
Serious noise in the systemTank oil quantity shortage: Insufficient oil causing increased noise.
Air leakage in the suction pipe: Allowing air to enter the system and generate noise.
Inferior quality pump: Poorly functioning pump causing excessive noise.
Inflexible action of the electro-hydraulic valve: Impaired valve operation leading to noise.
Fatigue or damage in the electro-hydraulic valve spring: Faulty spring causing noise.
Presence of dust or poor quality liquid oil in the pipeline: Contributing to noise.
Dirty oil: Contaminated oil generating noise.
High oil viscosity: Thick oil resulting in increased noise.
Excessive speed of the electro-hydraulic valve movement: Rapid valve action causing noise.
Refuel the tank according to regulations to ensure sufficient oil quantity.
Tighten or replace gaskets to eliminate air leakage in the suction pipe.
Perform maintenance or replace the inferior quality pump.
Maintain or replace the electro-hydraulic valve to restore smooth and flexible action.
Check and replace the electro-hydraulic valve spring if fatigued or damaged.
Clean the pipeline and use high-quality liquid oil to eliminate dust and poor oil conditions.
Replace dirty oil with clean fluid to reduce noise.
Adjust the oil viscosity to the recommended level.
Adjust the electro-hydraulic valve movement speed to an appropriate setting.
Perform regular maintenance and cleaning of the system components.
Adjust the damper to control noise and vibrations in the system.
Plunger produces crawlingThe system has air in itCheck all intake ports, connections, and joints to ensure they are properly sealed and not blocked.
Bleed the system to remove any trapped air.
Eliminate any obstructions or blockages in the system.
Ensure proper sealing and connection of fillers and other relevant components.

Parameter Of Marine Stiff Boom Crane

TypeSafety Load/KnMax Working Rod/mMin Working Rod/mHoisting Speed(m/min)Slewing Speed(m/min)Luffing Time/sHoisting Height/mSlewing Angle/"Permissible Heeling Power/KW



Know Who We Are

About our company

Zava Marine Corporation is a leading supplier of marine parts and components. With a strong focus on quality and customer satisfaction, we specialize in providing a comprehensive range of high-quality marine equipment and accessories. Our products include deck equipment, ship accessories, and various other essential components needed for smooth maritime operations.

With a global presence, we serve a diverse customer base, including shipbuilders, shipowners, offshore operators, and marine equipment distributors. We are committed to providing exceptional service and tailored solutions to meet our customers’ unique needs.


Zava Marine offers a comprehensive range of certifications for marine parts in accordance with international standards and regulations. These certifications include those provided by renowned marine classification societies such as Lloyd’s Register (LR), Bureau Veritas (BV), China Classification Society (CCS), Registro Italiano Navale (RINA), American Bureau of Shipping (ABS), Nippon Kaiji Kyokai (NK), and Det Norske Veritas – Germanischer Lloyd (DNV-GL). By collaborating with these esteemed societies, Zava Marine ensures that our certified marine parts meet the highest standards of safety, quality, and performance, instilling confidence in our reliability and compliance within the maritime industry.

The warranty provided by Zava Marine covers defects in materials and workmanship for a period of two years from the date of purchase. During this warranty period, if any marine parts purchased from Zava Marine exhibit issues or failures resulting from manufacturing defects or faulty materials, Zava Marine will take responsibility for repair or replacement of the affected parts. 

Zava Marine has recently opened new molds for European and North American clients, utilizing materials such as metal, ABS, PVC, and more. These successful mold opening projects allow us to provide customized marine parts and components that meet the specific requirements of our clients in these regions.

Typically, Zava Marine can ship samples within 7 days once the product drawing has been mutually confirmed by both parties. This efficient process ensures that customers can receive samples promptly, allowing them to assess the quality and suitability of the products.

Zava Marine frequently utilizes a wide range of materials in our projects. These materials include aluminum, stainless steel, carbon steel, copper, plastics, titanium, and PEEK (Polyether Ether Ketone). Each material offers unique properties and characteristics suitable for various marine applications. 

Yes, we provide customization services for marine parts. We understand that every project and application may have unique requirements, and we are committed to delivering tailored solutions. By collaborating closely with our clients, we can adapt our products to specific specifications, ensuring optimal fit, performance, and compatibility. Whether it’s modifying existing designs or creating entirely new parts, our customization services cater to the diverse needs of the maritime industry.

Absolutely! We offer product design and development services to support our clients’ needs. Our experienced team of engineers and designers can collaborate with clients from concept development to final product realization. By leveraging our expertise in marine engineering and design, we can provide valuable insights and innovative solutions. Whether it’s optimizing existing designs or creating entirely new products, we are equipped to assist clients in bringing their ideas to life efficiently and effectively.

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