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Marine Crane Hydraulic Cylinder Wholesale
Home / Product / Marine Equipment Hydraulic Cylinders / Marine Crane Hydraulic Cylinder

Marine Equipment Hydraulic Cylinders

Marine Crane Hydraulic Cylinder

A three-layer chromium composite electroplating process and sealing wax treatment are adopted for the rod outer circle, which guarantee corrosion resistance;

Compound sealing technology reduces the impact of oil pressure and enhances sealing performance;

The sheathed U-butt welding technique has a high welding performance and enhanced appearance.

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Overview

Advantages
1. The piston rod is treated with a double-layer chrome composite electroplating process to ensure good corrosion resistance;
2. The piston rod salt spray test reaches more than 200 hours.
3. The seals specially used for ship oil cylinders have better durability.

Parameters

Item

Value

Unit

Scope of application

Bore diameter

110 - 650

mm

Ro-ro ship / Crane / Mobile crane

Rod diameter

80 - 560

mm

Stroke

150 - 8000

mm

Working pressure

16 - 35

MPa

Output force

Push

≤ 4962

KN

Pull

≤ 2489

KN

Working pressure

-40 - 100

℃

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Jiangsu Hengcai Hydraulic Mechanical Co., Ltd.
As China Marine Crane Hydraulic Cylinder Manufacturers and Marine Crane Hydraulic Cylinder Factory, Jiangsu Hengcai Hydraulic Mechanical Co., Ltd. was founded in 1988, focusing on the research and manufacturing of hydraulic cylinders. The manufacturing facility is located in Jianhu County, Yancheng City, Jiangsu Province, which faces Dafeng port in the east, neighbors Xuzhou in the west, borders Nantong in the south, and connects Lianyungang in the north. Xichang railway crosses our city; 204 National Road, Yanhai Highway, Yanxu Highway, and Ningjing Highway are all available. Only 70 kilometers from Yancheng Nanyang International Airport, convenient traffic lays a good foundation for our rapid development!

The company covers an area of 130000 square meters and has more than 200 employees. It was named a national high-tech enterprise and Jiangsu province model enterprise on management. The company has gained the certificates of ISO9001, ISO14001, and CE and has a good record of enterprise operation.
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Marine Crane Hydraulic Cylinder Industry knowledge

Marine Crane Hydraulic Cylinder manufacturer

Jiangsu Hengcai Hydraulic Mechanical Co., Ltd. is the Marine Crane Hydraulic Cylinder manufacturer and source factory in China for shipboard and mobile crane actuators. This range is part of our Marine Equipment Hydraulic Cylinders family, covering Ro-ro ship cargo handling systems, shipboard cranes and mobile cranes.

Established in 1988, we have supplied hydraulic cylinders to more than 40 large and medium-sized main machine factories and exported with original equipment to the United States, Japan, Russia and other markets. Our factory in Jianhu County, Yancheng City, Jiangsu Province, employs more than 200 people across a 130,000-square-meter plant, with an annual output above 80,000 cylinders.

Positioning in the crane hydraulic system

A marine crane cylinder is not a standard industrial cylinder with extra paint. Its working point is defined by the crane lifting geometry, boom bending moments, ship motion, duty cycle and the corrosion load of a salt atmosphere. We size the bore, rod and stroke against those conditions rather than offering a single fixed model.

  • Ro-ro ship systems: cylinders for cargo loading and unloading equipment, where high thrust and stable lifting control are required under frequent operation.
  • Shipboard cranes: compact envelope, corrosion-resistant rod finish and reliable holding under wave-induced motion.
  • Mobile cranes: high-pressure operation, slender rod and barrel processing for long strokes, and low-friction sealing for smooth load control.

Critical specifications and what they mean

The table below shows the design envelope for our Marine Crane Hydraulic Cylinder range. The final sizes are confirmed after review of the crane kinematics and hydraulic system.

Parameter Hengcai range Selection meaning
Bore diameter 110 - 650 mm Determines available push force for lifting and luffing circuits.
Rod diameter 80 - 560 mm Selected against buckling, tension load and pull force requirements.
Stroke 150 - 8000 mm Defines the crane movement envelope and retracted/operating length.
Working pressure 16 - 35 MPa Matches pump and valve relief settings in the existing crane circuit.
Operating temperature -40 °C to 100 °C Requires marine seals and appropriate hydraulic oil for low-temperature start-up.
Rated output force Push ≤ 4962 kN / Pull ≤ 2489 kN Used for load-case verification and structural interface design.

Construction and marine protection

Reliability in this environment depends on plating, sealing and welding. Our marine cylinder production uses a double-layer composite chrome electroplating process on the piston rod, with sealing wax treatment on the rod outer circle. The salt spray test result reaches more than 200 hours.

  • Compound sealing technology dampens oil-pressure impact and improves sealing performance under load spikes.
  • Marine-grade seals are specified for better durability in shipboard hydraulic systems.
  • U-butt welding is used for high-strength welded joints with clean appearance.
  • Buffer design can be incorporated for controlled deceleration at end of stroke.

Configuration and integration approach

Every marine crane cylinder is configured around the actual crane interface: pin centers, retracted length, mounting style, ports and hose routing. If you supply drawings or samples, we develop and produce according to your specification; for new crane designs we adapt bore, rod, stroke and end connections to the hydraulic system.

  • Mounting: clevis, pin, flange, trunnion or custom end with pin bores and widths matched to the crane structure.
  • Position feedback: cylinder geometry can be prepared for linear displacement transducer integration where the crane control system requires continuous position or load-holding logic.
  • Ports: flange, threaded or welded ports with orientation defined by the hose and valve layout.
  • Related range: our Crane Hydraulic Cylinder covers truck and crawler crane applications, while the Marine Machinery Hydraulic Cylinder serves other shipboard hydraulic systems.

Manufacturing and quality control at the Hengcai factory

We keep the core production steps inside our own factory so that weld quality, heat treatment, chrome plating and coating remain under direct control. The plant has 22 manufacturing processes and 109 processing capabilities, with a self-made parts rate of about 70%.

  • Welding: controlled U-butt welding with appearance and strength checks.
  • Heat treatment: overall tempering and surface induction hardening, followed by hardness, tensile and metallographic tests.
  • Coating: 315-meter automatic electrostatic coating line with thickness, adhesion and corrosion-resistance testing.
  • Large honing and machining capacity for long-stroke, slender rod and barrel processing.
  • Test capability: durability test bench, reciprocating and buffer performance test bench, plus physical/chemical and metallographic laboratories.
  • Traceability: each job is recorded through design, processing and inspection, supported by PLM and ERP management systems.

The factory operates under ISO9001, ISO14001 and CE certification, and is recognized as a national high-tech enterprise.

Installation, commissioning and after-sales support

Marine crane cylinders are often installed on equipment working far from the factory. We support installation and commissioning, train maintenance teams and provide a one-year warranty against defects in material or workmanship under normal use.

  • Warranty: one year from delivery.
  • Response: quality issues reported online or by phone receive a response within 24 hours; diagnosis and a detailed plan are prepared within 3-5 days.
  • Accessories: long-term supply of metal parts, pipe joints, sealing rings and rubber parts for cylinders we produce.
  • Guidance: installation advice, maintenance recommendations and troubleshooting support are provided with the project.

Information we use to prepare your marine crane cylinder proposal

To prepare a configuration and quotation, we need the working point of the cylinder rather than only an original part number.

  • Working pressure, flow rate and duty cycle of the crane pump and valve system.
  • Required bore, rod, stroke and retracted or installed length, or an outline drawing.
  • Mounting type, pin bores and clevis width.
  • Load profile: push and pull force, side load, boom angle and buckling condition.
  • Environmental conditions: salt exposure, temperature range, deck location and washdown frequency.
  • Port type, port size and hose-end orientation, plus any position sensor requirement.
  • Accepted inspection standard, certification documents and export packaging requirements.

Marine crane cylinder FAQs

What crane applications do these cylinders cover?

Our Marine Crane Hydraulic Cylinder range is used in Ro-ro ship cargo handling systems, shipboard cranes and mobile cranes. The design prioritizes thrust, stability and durability under high-load, high-frequency operation, while the rod plating and sealing package are matched to the marine environment.

What sizes can we specify?

The envelope is 110-650 mm bore, 80-560 mm rod, 150-8000 mm stroke and 16-35 MPa working pressure. The rod diameter and stroke are adjusted against the crane geometry and load profile.

How is corrosion protection handled?

The piston rod is protected with double-layer composite chrome plating, and the plated surface receives sealing wax treatment. Marine-duty seals are specified inside the cylinder, and the rod salt spray test reaches more than 200 hours.

Can we supply drawings for customized cylinders?

Yes. We develop and produce according to customer drawings or samples, and for new designs we can modify bore, rod, stroke, end connection, mounting and sealing package as part of our OEM program.

What after-sales service is provided?

Cylinders carry a one-year warranty against material or workmanship defects under normal use. We provide installation and commissioning support, maintenance guidance, a 24-hour response for reported quality issues and long-term supply of replacement accessories.