HYDRAULIC MODULAR TRAILER – MODEL:SY-P661

For the transportation of heavy and oversized cargo, Shiyun Group has independently developed its own proprietary Multi axles hydraulic modular trailer, which can flexibly meet transportation requirements of various lengths and widths. It features simple operation, a wide range of sizes and models, as well as cost-effectiveness and better practicality.

For the exterior design, we offer two options: the classic version and the upgraded version. You may choose different styles according to your preference. Compared with the classic version, the upgraded version features a more refined and attractive appearance, and is equipped with an automatic pinning function.

Why Choose Our Hydraulic Modular Trailer? — Engineered Beyond the Standard

Our hydraulic modular trailer system was originally developed based on the proven platform architecture. Over years of continuous R&D and extensive redesign, we have evolved far beyond the original configuration — transforming it into a next-generation modular transport solution with enhanced performance, greater adaptability, and superior cost-efficiency for heavy haulage operations worldwide.

Today, our modular trailer is a fully independent product line — purpose-built for the most demanding project cargo, oversized load, and heavy lift transport applications across power, energy, petrochemical, wind, infrastructure, and marine industries.

• Modular Design — Built Like Building Blocks
  • Each axle line module can be combined longitudinally and laterally to match any cargo weight and dimension
  • Configurable as semi-trailer, drawbar trailer, or self-propelled modular transporter (SPMT)
  • One system covers your entire fleet needs — from 50-tonne machinery to multi-thousand-tonne project cargo
• Enhanced Hydraulic Suspension System
  • Hydraulic pendular axle with extended stroke for superior load leveling on uneven terrain
  • Platform height fully adjustable — low platform design minimizes overall transport height
  • Automatic self-leveling ensures cargo stability on steep gradients, tight corners, and rough roads
• Full All-Wheel Steering
  • Hydraulic all-wheel steering with large steering angle for tight maneuverability
  • Supports multiple steering modes: straight-line, oblique, crab steering, and coordinated turning
  • Enables navigation through narrow urban streets, complex job sites, and confined industrial areas
• Superior Load Capacity
  • Each axle line delivers exceptional load-bearing performance
  • Modules can be stacked and combined to transport loads from dozens of tonnes to thousands of tonnes
  • Proven in real-world heavy haulage: transformers, generators, wind blades, reactor vessels, bridge beams, and offshore modules
• Self-Loading Capability
  • Integrated hydraulic lifting cylinders enable self-loading and self-unloading without external cranes
  • Reduces dependency on auxiliary equipment and cuts operational costs significantly
• Power Pack Unit (PPU) — Self-Propelled Option
  • Optional PPU-powered self-propelled configuration eliminates the need for a separate tractor unit
  • Ideal for shipyard operations, port logistics, factory transfers, and on-site heavy transport

Item	Name	Parameters
1	Wheel base	1550mm
2	Wheel track	740/1820mm
3	Tires quantity	8pcs/axle line
4	Tire size	215/75R17.5
5	Rim size	6.00-17.5
6	Platform width	3000mm
7	Platform height	1075±300 mm
8	Material	Q690D
9	Tare weight	3700kg/axle line
10	Steering angle	45°

Hydraulic Modular Semi-Trailer — Heavy-Duty Transport Engineered for Performance

Designed for the most demanding heavy-haulage operations, our hydraulic modular semi-trailer delivers exceptional versatility, structural resilience, and operational precision across a wide spectrum of project cargo applications.

Built upon a proven modular architecture, the system enables seamless longitudinal and lateral coupling of axle line modules, allowing operators to tailor the configuration precisely to the weight, dimensions, and center of gravity of each load — from compact industrial machinery to oversized power generation equipment.

• Constructed with Q690 high-strength steel, delivering an outstanding load-to-weight ratio and long-term structural durability
• Reinforced main frame and crossbeam design ensures reliable performance under extreme loading conditions

• Full hydraulic pendular axle suspension with extended stroke provides automatic load equalization across all axle lines
• Integrated lifting function enables platform height adjustment for optimized ground clearance and loading convenience
• Maintains cargo stability on uneven terrain, steep gradients, and challenging road surfaces

• Full-wheel hydraulic steering supports multiple operating modes including straight-line travel, oblique steering, crab steering, and coordinated turning
• Delivers exceptional maneuverability in confined spaces, tight corners, and complex job site environments

• 2, 3, 4, 5, 6, and 8 axle line configurations available to match diverse tonnage requirements
• Choose between complete modular unit or split modular unit based on transport logistics
• Modules can be coupled side-by-side or end-to-end for customized platform dimensions
• Available as drawbar trailer or semi-trailer to suit different tractor and route requirements

• Equipped with a dedicated operation control box for intuitive hydraulic system management
• Maximum towed speed up to 80 km/h, ensuring efficient long-distance transport without compromising safety

• Strong interface compatibility with mainstream European modular trailer systems, enabling fleet integration and multi-brand operational flexibility

Typical Applications

Our hydraulic modular semi-trailer is widely deployed in the transportation of heavy-lift and oversized cargo, including but not limited to:

• Power transformers and generators
• Wind turbine components (blades, tower sections, nacelles)
• Petrochemical vessels and reactor modules
• Bridge girders and precast infrastructure elements
• Mining and construction heavy machinery
• Industrial plant equipment and engineering structures

Operators can scale the axle line configuration to precisely match the gross weight and load distribution of each shipment. The highly modular architecture supports both lateral widening and longitudinal extension, enabling flexible platform adaptation to meet a wide range of heavy-haulage and oversized cargo transport requirements.

Module Longitudinal connection (end by end): ↓

Modular transverse connection(side by side): ↓

Manufacturing Workflow of SHIYUN Modular Trailers

End-of-line dimensional and cosmetic audit, protective wrapping and securing for transit, followed by logistics coordination and on-time delivery.

Every SHIYUN hydraulic modular trailer undergoes a comprehensive pre-delivery testing protocol prior to dispatch. Each unit is subjected to a static overload test at 125%–150% of its rated payload capacity, verifying the structural integrity of the main frame, cross members, and suspension mounting points under extreme loading conditions. In addition to the static load verification, a series of functional performance tests are carried out, including axle load balancing to confirm uniform weight distribution across all axle lines, hydraulic lifting cycle tests to validate suspension stroke and leveling accuracy, and multi-mode steering function tests to ensure precise and synchronized wheel articulation. The trailer is then subjected to dynamic running tests on the proving ground, during which handling stability, braking response, and steering performance are evaluated under loaded conditions. Upon successful completion of all test procedures, a detailed inspection and test report — covering load test data, hydraulic pressure readings, steering parameters, and overall performance results — is compiled and provided to the customer, ensuring full traceability and enabling safe, efficient operation from the very first deployment.

We also provide General accessories for the modular trailers for individual equipment:

4.1  Hydraulic gooseneck .

The hydraulic gooseneck module is engineered for seamless integration with SHIYUN modular trailer platforms, offering precise hydraulic height adjustment to accommodate varying fifth-wheel heights across different prime movers. The primary control valves governing all module functions are centrally mounted on the gooseneck assembly or the dedicated operation panel, providing operators with intuitive, single-point access to every hydraulic command. Through the control valves, hydraulic pressure is smoothly regulated and proportionally distributed between the tractor fifth wheel coupling and the modular trailer units, ensuring balanced load transfer, stable coupling engagement, and consistent platform height control throughout the transport operation.

In addition to the Nicolas Power Hydraulic Gooseneck, we also provide a cost-efficient alternative coupling solution based on a drop deck configuration with a detachable gooseneck. This configuration enables the gooseneck section to be separated from the trailer deck, allowing the front end of the trailer to rest directly on ground level for straightforward loading and unloading of heavy equipment and oversized cargo. Once loading is complete, the gooseneck is reattached and the trailer is restored to its standard transport configuration. This design delivers a practical balance between acquisition cost and operational versatility, making it an attractive option for customers who require reliable heavy-cargo transport capability without the investment associated with a fully powered hydraulic gooseneck

system.

4.2 Drawbar & steering swivel arms

The drawbar assembly is engineered from high-strength forged steel, delivering exceptional structural durability and fatigue resistance under sustained heavy-load conditions. Its precision-machined coupling interface ensures stable steering response and efficient torque transmission between the prime mover and the modular trailer combination. The swivel arms feature a robust pivot bearing design that accommodates multi-directional articulation, enabling smooth steering across a wide range of turning radii. Both the drawbar and swivel arm assemblies are designed for rapid connection and disconnection, minimizing setup time on site. Their proven reliability in demanding heavy-haul transport applications makes them fully compatible with various module configurations, including single-line, multi-line, and hybrid axle arrangements.

4.3 Power pack unit

The SHIYUN modular trailer’s power pack unit serves as the central hydraulic power source for the entire transport system. It integrates a horizontally-mounted diesel engine, a multi-stage hydraulic pump assembly, a high-capacity reservoir, an oil-to-air cooling system, a manifold-mounted valve block, a hydraulic accumulator, and a microprocessor-based electronic control unit.

When coupled with the trailer’s main control console, this power unit delivers precise hydraulic flow for suspension lifting and multi-mode steering actuation. For enhanced operational safety and visibility, the system can be configured with an electro-hydraulic proportional steering valve, enabling fully remote steering control from a safe vantage point. This ensures accurate maneuverability while keeping the operator clear of the immediate load zone during critical positioning tasks.

4.4 Low profile Drop deck

The drop deck module is engineered with an ultra-low deck height and a deep-digging excavator recess, specifically designed to maximize vertical clearance for transporting tall and oversized cargo. The platform features interchangeable floor inserts, allowing operators to customize the deck surface for different load types, while the short bogie spacing ensures superior maneuverability in confined job sites and tight turning radii.

To accommodate varying cargo dimensions, the drop deck is designed with a modular splicing system, enabling the frame to be extended or shortened by selecting different deck lengths to match specific transport requirements. For heavy-haul applications where the payload exceeds 200 metric tons, we strongly recommend the installation of

side-mounted load distribution beams. These beams effectively disperse concentrated weight across the trailer structure, ensuring structural integrity and compliance with road regulations during extreme heavy-lift operations.

4.5 Vessel bridge

The Vessel Bridge is a purpose-built transport platform, specially engineered for the safe and efficient conveyance of extra-large, high-value, and heavy-duty cargoes such as industrial transformers, reactor vessels, pressure vessels, and other oversized project cargo. The platform features a telescopic length adjustment mechanism, enabling the bridge span to be extended or retracted to match the exact longitudinal dimensions of the load. In addition, the structure supports modular connection length expansion, allowing multiple bridge sections to be coupled together for longer cargo profiles. A width expansion system is also integrated, providing adjustable lateral support to accommodate loads of varying widths and ensuring full platform coverage. This combination of adjustable length, expandable width, and modular connectivity allows the Vessel Bridge to adapt to a wide range of cargo weights, tonnages, and dimensional configurations, delivering a versatile and reliable transport solution for the most demanding heavy-lift logistics operations.

4.6 Spacer (Intermediate platform)

The spacer module — also referred to as an intermediate platform — serves as a structural extension element within the SHIYUN modular trailer system. It is designed to extend the effective loading area or increase the axle spacing between adjacent modules, enabling the trailer configuration to accommodate elongated or irregularly shaped cargo without imposing excessive loads on individual axle lines.

Constructed with the same box-section frame architecture as the standard modular platform, the spacer maintains full structural compatibility with the main trailer system. This ensures uniform load distribution, consistent torsional rigidity, and seamless integration with adjacent modules through the standard bolt-plate coupling interface. The spacer can be deployed in various positions within the trailer combination — between axle modules, between a gooseneck and the main deck, or between multiple load-bearing sections — providing operators with the flexibility to tailor the platform length precisely to the cargo profile while preserving the overall structural integrity and road-worthiness of the transport combination.

4.7 Extendable Spacer (Telescopic Intermediate Platform)

The extendable spacer is one of the most widely specified accessories in the SHIYUN modular trailer range. Built upon the same high-strength box-section frame architecture as the standard intermediate platform, it adds a hydraulically actuated telescopic extension mechanism that allows the platform length to be adjusted on site to precisely match the longitudinal span of the cargo.

This telescopic capability makes the extendable spacer particularly well suited for transporting extra-long project cargo such as wind turbine blades, tower sections, steel girders, bridge beams, and other elongated industrial components. Rather than requiring a dedicated fixed-length trailer for each cargo dimension, a single extendable spacer can be configured to accommodate a wide range of load lengths, significantly reducing the need for multiple specialized transport units.

The extendable spacer is designed to be coupled between two standard modular trailer units, effectively bridging the gap and creating a continuous, stable loading surface across the full cargo length. Its modular coupling interfaces ensure full structural compatibility with the SHIYUN system, maintaining uniform load distribution and torsional rigidity throughout the transport combination. This makes it an ideal solution for operators who require a versatile, cost-effective platform extension without compromising the structural performance of the overall trailer configuration.

4.8 High girder bridge

For transport operations involving payloads exceeding 300 metric tons, the High Girder Bridge is the preferred structural solution. It is specifically engineered to address the challenge of highly concentrated loads — a common issue when transporting dense, compact cargo such as large power transformers, reactor vessels, and heavy industrial equipment — where the weight is concentrated over a relatively small footprint rather than being evenly distributed across the trailer platform.

The High Girder Bridge features a deep box-section girder structure with exceptional bending strength and torsional rigidity, enabling it to span across multiple axle lines and effectively redistribute concentrated point loads over a wider structural area. This load-spreading capability prevents excessive stress on individual axle lines, ensuring that the weight is shared uniformly across the entire modular trailer combination and keeping each axle within its rated capacity. The girder bridge is mounted on top of the standard modular trailer platform and can be configured in various lengths and heights to suit the specific cargo profile and ground clearance requirements. Its modular design ensures full compatibility with the SHIYUN trailer system, allowing seamless integration with standard axle modules, power pack units, and coupling interfaces. By bridging the gap between the cargo’s concentrated weight and the trailer’s distributed load-bearing structure, the High Girder Bridge delivers a safe, reliable, and structurally optimized solution for the most demanding ultra-heavy transport applications.

4.9 Long load turntable

For the transportation of extra-long cargo with relatively light structural weight — such as wind turbine blades, long steel girders, pipeline sections, and elongated structural assemblies — the Long Load Turntable offers a highly efficient and cost-effective transport solution. Rather than occupying a full continuous trailer platform, the turntable system supports the cargo at two discrete load-bearing points (front and rear), each independently mounted on a standard modular trailer axle unit.

The front and rear support modules are connected through a synchronized steering linkage system, ensuring that both axle units articulate in unison during turning maneuvers. This coordinated steering maintains the longitudinal alignment of the cargo throughout the transport route, preventing lateral drift and ensuring stable tracking through curves and intersections. The turntable bearing interface at each support point allows controlled rotational movement, accommodating the natural angular displacement that occurs when the trailer combination negotiates bends.

This dual-point support configuration significantly reduces the number of axle modules required compared to a full-length platform, resulting in lower overall transport cost while maintaining full operational safety and maneuverability. The system is fully compatible with the SHIYUN modular trailer platform, utilizing standard coupling interfaces and hydraulic connections for rapid assembly and deployment.

As a leading manufacturer of heavy-duty vehicle transport equipment, Shiyun has an impressive portfolio of successful projects:

From Proven Foundation to Independent Innovation

Our modular trailer started with a solid engineering foundation but has since undergone extensive structural, hydraulic, and control system upgrades. The result is a product that retains the reliability of proven modular architecture while

delivering:

• Improved structural strength — reinforced main beam and crossbeam design using high-strength steel
• Enhanced hydraulic circuit — upgraded hydraulic system with overload protection and pressure relief valves
• Optimized steering control — refined hydraulic and electronic steering for smoother, more precise operation
• Better adaptability — redesigned connection systems and module interfaces for faster assembly and wider compatibility

• Significantly lower acquisition cost compared to European-brand modular trailers
• Shorter delivery lead time — no long waiting lists
• Lower maintenance cost — locally available spare parts and technical support
• Faster ROI — one modular system replaces multiple specialized trailers

• Designed for international heavy haulage standards
• Suitable for Middle East, Africa, Southeast Asia, Latin America, and CIS markets
• Backed by comprehensive technical documentation, operator training, and after-sales support

When conventional trailers can’t handle the job, our hydraulic modular trailer delivers the power, flexibility, and precision your heaviest cargo demands — at a fraction of the cost of imported alternatives.

✉️ Contact us today for specifications, configuration options, and competitive quotation.