• Sep 29, 2025
• News

Rubber Tyred Gantry Crane: Parts, Function and Specification

A rubber tyred gantry (RTG) crane is a mobile gantry crane equipped with rubber tires, allowing it to move within a terminal without the need for fixed rails. This mobility facilitates container handling operations in ports and intermodal yards.

Tire Gantry Crane is an important lifting equipment in ports, terminals and container yards, this kind of cranes use tires to move, do not rely on the track, so it is more flexible. This article focuses on the components, functions and specifications of tire cranes.

Parts of a Rubber Tyred Gantry Crane

RTG cranes combine heavy structure, precise mechanics, and smart controls to move containers safely and fast. They work in busy yards and ports. Each major part plays a clear role. Good design keeps loads steady and operations efficient. Regular inspection and planned maintenance keep the system reliable and extend service life.

1. Frame Structure

The crane's backbone is its frame. It consists of the undercarriage, cross-bracing, A-frame legs, and main girder. High-strength steel and bolted or welded joints that are sized for fatigue, shear, and bending are used by engineers. To ensure that the crane remains stable when lifts are off-center, designers verify deflection limitations. For simple maintenance, the frame frequently includes inspection ports, ladders, and access platforms. Steel is protected in severe outdoor yards by surface coatings and corrosion prevention. To make transportation and site assembly easier, many frames are modular. In order for the yard surface to securely support the wheel or rail loads, load distribution to tires and foundations is planned.

2. Hoist Mechanism

The hoist lifts and lowers the load. It contains the hoist motor, gearbox or frequency drive, drum or reeving system, wire ropes, block, and brakes. Modern hoists use variable-frequency drives for smooth starts and stops. Redundant safety brakes and limit switches prevent overtravel. Wire ropes and hooks meet strict inspection and replacement schedules. Designers pick hoist sizes and gearing to match rated capacity and duty cycle. Proper lubrication, cooling, and bearing choices reduce wear. The hoist must also handle dynamic forces from acceleration, wind, and swinging loads.

3. Trolley

The trolley carries the hoist across the girder. It rides on rails or track plates and moves with variable speeds for transfer and fine positioning. Position feedback comes from encoders, laser or magnetic transponders for accurate stopping. The trolley frame includes wheels, drive motors, brakes, and maintenance access points. Controls coordinate trolley motion with hoist lifting to reduce sway and ensure safe picks. Safety features include end stops, anti-collision logic, and torque monitoring. Trolley design affects travel speed, cycle time, and positioning precision.

4. Rubber Tires

Large rubber tires give RTGs their mobility. Yards use either pneumatic or solid tires depending on speed and load. Tires sit on multiple axles with driven and steerable wheel sets. Proper tire selection and inflation (for pneumatic types) control ground bearing pressure and reduce rutting. Tire wear, alignment, and load sharing need regular checks. The yard surface must be compacted and graded for smooth travel. Tire systems often include monitoring for pressure, temperature, and wear to avoid sudden failures and downtime.

5. Control System

The control system ties operator inputs to machine motion. It includes the operator cabin or remote console, PLCs, HMIs, joysticks, and safety interlocks. Software manages motion profiles, anti-sway assist, collision avoidance, and load monitoring. Modern systems add cameras, 3D sensors, and telemetry for remote monitoring and fleet management. Diagnostics report faults and maintenance needs. Ergonomic cabin layout reduces operator fatigue. Controls also enforce limits and emergency stops to meet safety regulations.

6. Power Supply

RTGs run on diesel, hybrid, or full electric systems. Diesel gives wide range and long operation without yard infrastructure. Hybrid systems combine diesel gen-sets with battery packs to reduce fuel use and capture regenerative braking energy. Fully electric RTGs use busbars, cable reels, or battery swaps to cut emissions further. Each option trades off fuel cost, emissions, infrastructure needs, and maintenance. Fuel or energy management systems track consumption and optimize engine use.

7. Anti-Sway System

Anti-sway systems control load pendulum during motion. They use sensors like encoders, and load cells to sense sway and position. Control algorithms then adjust acceleration, trolley speed, or apply corrective moves to dampen oscillation. Advanced versions predict motion and apply preemptive corrections for faster cycles. The system improves pick accuracy and reduces container damage and rework. It also increases safety by reducing sudden load swings in windy or congested yards.

Function of Rubber Tyred Gantry Cranes

Rubber tyred gantry (RTG) cranes move and stack shipping containers across busy yards. They combine heavy lifting power with on-site mobility. Their rubber wheels free them from fixed rails. This lets terminals change layouts and respond to peaks in traffic. RTGs work with terminal operating systems and spreader tools. They can run with manual drivers, remote control, or automation. Many modern RTGs use hybrid or electric drives to cut fuel use and emissions.

1. Container Stacking

RTGs excel at dense block stacking in container yards. They lift and place containers up to about five to eight tiers high, depending on the model and yard rules. Operators use single, tandem, or twin-lift spreaders to handle one or two containers at once. The cranes position containers precisely to maximize stack density while keeping safe clearances. Features like anti-sway, load sensors, and soft-landing reduce damage and speed up cycle times. This makes RTGs ideal where land is limited and storage density matters.

2. Intermodal Transfers

RTGs speed transfers between trucks, trains, and other lifting systems. They take containers from truck trailers and place them into stacks or directly onto rail wagons when layouts allow. The cranes bridge gaps between quay operations and inland transport by reorganizing containers for onward moves. Their flexible travel paths shorten truck dwell times and improve gate throughput. Integrating RTGs with yard software helps prioritize urgent moves and reduces handling steps.

3. Mobility Across Terminals

RTGs move freely across paved yards without trackwork. Their rubber tires and steering systems let them span multiple lanes and reach different stack blocks. That mobility supports quick reconfiguration of the yard and easier handling of seasonal surges. Some RTGs include GPS/RTK guidance or automated driving to follow predefined routes and improve accuracy. Keep in mind they need well-prepared pavements and sufficient ground-bearing capacity to operate safely.

4. Cost Efficiency

By moving more containers from the same space, RTGs save operating costs. Faster cycle times and twin-lift options reduce the cost of transfers per container. Additionally, they eliminate the cost and inconvenience of setting up rail tracks. Over time, switching to electric or hybrid power lowers pollution and fuel costs. However, RTGs need sturdy yard surfaces and require engine and tire maintenance. RTGs are a wise investment for busy terminals because of their careful selection, automation, and preventive maintenance.

Specifications of Rubber Tyred Gantry Cranes

RTG crane specifications vary depending on the manufacturer and application. Below are some standard specifications:

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A rubber-tyred gantry (RTG) crane is a mobile container handler that runs on heavy-duty rubber tyres instead of fixed rails. It lifts containers with a powered spreader that travels vertically on the gantry and can stack containers several rows high. RTGs come in diesel-electric, hybrid, or electric drive variants and often include steerable axles for tight turning and lane alignment. Check ground bearing capacity and yard surface prep, because tyre loads and rutting affect long-term performance. Ask about anti-collision systems, wheel alignment controls, energy recovery on lowering, and local service support for tyres and hydraulics. Lastly, before committing, consider operator cabin ergonomics, spare-parts availability, and inspection intervals.

Advantages of Rubber Tyred Gantry Cranes

One of the most common pieces of equipment in shipping ports and logistical centers worldwide are Rubber Tyred Gantry (RTG) cranes. Because of their design, operators may easily handle enormous volumes of containers without being constrained by fixed tracks. RTGs can travel between regions of the yard and cover numerous stacks, which increases efficiency and eliminates bottlenecks compared to rail-mounted cranes. In order to make them dependable and economical, modern RTGs are also constructed with sophisticated control systems, energy-saving technologies, and safety features. Because of these benefits, RTGs are a wise choice for ports and terminals trying to strike a balance between sustainability, flexibility, and efficiency.

1. Flexibility

One of the main advantages of RTG cranes is their ability to move freely across container yards or terminals. Since they are not tied to rails, RTGs can shift between different storage blocks and adapt quickly to changing operational needs. This flexibility allows terminal operators to handle peak traffic, redirect operations in case of congestion, and scale yard layouts without major infrastructure changes. Their mobility also reduces the need for additional cranes in different areas, which saves space and cost while improving overall yard efficiency.

2. Space Optimization

RTG cranes are designed to handle high stacking of containers, often up to six or more tiers high and wide rows across. This vertical and horizontal stacking capability helps terminals maximize limited yard space, especially in high-demand ports with little available land. By allowing denser storage, RTGs increase throughput per square meter and delay the need for expensive terminal expansion projects. Better space use also improves container organization, which shortens retrieval times and enhances the flow of goods in and out of the terminal.

3. Reduced Emissions

Modern RTG cranes increasingly use electric or hybrid power systems, which lower emissions and cut fuel consumption compared to older diesel-only models. Electric RTGs can connect to grid power or use energy storage systems, reducing greenhouse gases and improving air quality in and around the port. Hybrid RTGs, equipped with energy regeneration technology, capture power during braking or lowering movements and reuse it for operations. This not only reduces environmental impact but also lowers operating costs by saving fuel and improving energy efficiency.

4. Enhanced Safety

RTGs are equipped with advanced safety systems that protect both operators and equipment. Anti-sway technology stabilizes the load during lifting and travel, making operations faster and reducing risks of accidents. Automated positioning and collision-avoidance systems help improve precision and reduce human error in crowded yards. Many RTGs also include remote monitoring, CCTV integration, and ergonomic cabins that enhance operator awareness and comfort. These safety features reduce the likelihood of accidents.

Challenges and Maintenance of RTG Cranes

Rubber-Tired Gantry (RTG) cranes are powerful and versatile machines, but they also face several challenges in daily operations. Their large size and complex systems demand skilled operators and regular maintenance to ensure smooth performance. Harsh outdoor conditions, heavy loads, and frequent use can speed up wear and tear. Downtime can be costly, so proper inspection, preventive care, and timely repairs are critical for safe and efficient operation. A strong maintenance plan helps extend the lifespan of the crane and reduces unexpected breakdowns.

1. Common Challenges of RTG Cranes

Heavy lifting and uninterrupted schedules cause persistent stress for RTG cranes, which are frequently used in crowded container yards. Particularly on uneven or rough terrain, their rubber tires can wear out quickly, necessitating expensive replacements. Because many RTGs run on diesel, which raises operating expenses and pollution, fuel or energy consumption is another issue. In coastal ports, exposure to dust, moisture, or salt air can cause electrical systems, control software, and sensors to malfunction. Terminal space constraints can also make maneuvering challenging, necessitating competent drivers and dependable steering devices to prevent mishaps.

2. Maintenance Needs of RTG Cranes

RTG cranes require regular inspection and preventive maintenance to stay reliable. Tires must be checked for pressure, wear, and alignment, while engines and hydraulic systems need oil changes, filter replacements, and leak checks. Electrical components, such as control units, sensors, and wiring, should be tested frequently to prevent malfunctions. Lubrication of moving parts like hoists, pulleys, and bearings is essential to reduce friction and extend service life. Software and automation systems also need updates and calibration to keep the crane accurate and safe. A scheduled maintenance program minimizes downtime and ensures the crane can handle heavy work without interruption.

3. Suitable Operation for Reliable Operation

Good maintenance goes hand in hand with suitable operating practices. In order to prevent abrupt stops, manage loads smoothly, and lessen the strain on tires and mechanical components, operators should receive proper training. Modern energy-saving devices, such electric or hybrid RTGs, can reduce pollutants and fuel expenses. It is simpler to identify reoccurring issues and create plans when thorough records of maintenance, inspections, and part replacements are kept.

Conclusion

Tire gantry cranes are important equipment for efficient handling of containers in ports and terminals. These cranes are characterized by their rigid structure, flexible operation, and freedom of movement on the ground, which reduces the expenditure on laying tracks.

Yuantai Crane

Yuantai, with a decade of crane manufacturing expertise in Changyuan, Henan, operates a facility spanning 240,000 square meters, producing over 10,000 sets annually valued at RMB 1.5 billion. They export top-quality European-style cranes to 150+ countries, serving diverse industries such as steel and petrochemicals.