Hydraulic Aggregates

Hydraulic Aggregates: The powerful heart of the truck tail gate

A high-performance hydraulic aggregate is the power center of every tail gate. It combines motor, pump, tank and valve technology into a compact unit and generates the hydraulic pressure required for all lifting, lowering and closing movements. In this category, you will find hydraulic aggregates designed for professional use in the transport and logistics sector. Truck lift gates rely on the same basic principle: the power pack converts electrical energy into hydraulic output and ensures that loads are moved safely, controlled and efficiently under various operating conditions. At SULEJ Ladebordwand, the focus lies on durable and maintenance-friendly components that convince in daily operation through reliability, stability and consistent performance.

Hydraulic power transmission: How a hydraulic aggregate works inside a truck lift gate

The basic principle of a hydraulic aggregate is the controlled conversion of electrical energy into hydraulic performance. An electric motor drives a precisely dimensioned hydraulic pump that draws hydraulic oil from the tank and supplies it under high pressure. Through control valves, the pressurized oil is then routed to the hydraulic cylinders mounted on the tail gate. There, the hydraulic pressure is converted into linear motion — the platform lifts, lowers or closes reliably and with constant force. The valve control enables precise metering of the oil quantity, allowing all movements to run smoothly, evenly and reproducibly. The quality of the core components — motor, pump, valves, tank and sealing systems — directly determines the performance, efficiency and reliability of the entire hydraulic system in daily use.

Designs and materials: Construction for different application requirements

Hydraulic power packs are available in various designs to reliably meet the requirements of different vehicles and operational scenarios. Key technical parameters include operating voltage, tank volume and the performance characteristics of the installed pump. Light transporters and flatbed vehicles typically use 12-volt aggregates, while heavier commercial vehicles generally operate with 24-volt systems. The size of the hydraulic oil tank is also crucial: it must match lifting height, platform dimensions and number of hydraulic cylinders to ensure sufficient oil volume is available for all movement sequences at all times. In truck lift gates, thermal stability of the aggregate also plays an important role, as many systems operate in intensive continuous use and are therefore exposed to higher load cycles. Equally important is the alignment of flow rate and permissible pressure range. Only when these values match the required lifting capacity and operating speed of the tail gate does the hydraulic system work efficiently and without unnecessary heat generation. Robust materials such as steel or high-grade aluminum alloys are used for housings, pump units and motor components. Corrosion-resistant coatings and durable sealing systems additionally protect the aggregate against moisture, dirt and temperature fluctuations. As a result, delivery performance remains stable even during intensive continuous use, and the operational safety of the entire system is ensured over the long term.

Consistent performance: Proper maintenance and service of the power pack

To ensure a hydraulic aggregate on a tail gate operates reliably in the long term, regular inspections and maintenance are essential. These include checking the hydraulic oil level, visual inspection for potential oil leaks on the aggregate, lines and connections, and adherence to manufacturer-recommended service intervals. Contaminated or aged hydraulic oil can lead to increased wear, louder operating noise and noticeable loss of performance, as particles and deposits place additional strain on pumps, valves and cylinders. A truck lift gate reacts particularly sensitively to contaminated oil because operational loads can vary significantly in daily use. Timely replacement of oil and filters ensures that the aggregate maintains its performance and all hydraulic movements are executed evenly. Regular system checks help prevent unplanned downtime and ensure long-term operational reliability.

Practical use and operational benefits: Efficiency in daily tail gate operation

In everyday use, the hydraulic aggregate determines how efficiently and reliably a tail gate operates. In distribution transport, a powerful aggregate enables short loading cycles and reduces downtime at ramps or job sites. Craft businesses benefit from smooth lifting movements when loading materials, machinery or tools. A truck lift gate places similar demands on the hydraulic supply, particularly when vehicles are operated in mixed service or under varying loads. What matters most is that the aggregate provides sufficient pressure, flow rate and response speed at all times so that the lifting system functions reliably. Well-matched hydraulic aggregates can typically be integrated into existing systems without difficulty, provided voltage, flow performance, pressure range and connection dimensions are taken into account.

Benefits of high-quality hydraulic aggregates at a glance

• Reliable supply of pressurized oil for all lifting, lowering and closing movements
• High operational safety even under intense use and full load
• Long-lasting construction with robust materials and precise sealing technology
• Minimal downtime thanks to optimized delivery performance and predictable maintenance
• Suitable versions for different vehicle classes and hydraulic lifting systems

The hydraulic aggregates offered in this category are suitable for common tail gates and truck lift gates and cover a wide range of professional applications in daily transport and logistics operations.

Frequently asked questions about hydraulic aggregates for tail gates and truck lift gates (FAQ)

How do I recognize a defective hydraulic aggregate?

Typical signs include slowed or jerky platform movement, unusual noises such as humming or screeching, visible oil leaks on the aggregate or overheating of the electric motor. In such cases, the hydraulic system should be inspected promptly by qualified personnel.

How often should hydraulic oil be changed?

Change intervals depend on manufacturer specifications and operating intensity. Replacement every 12 to 24 months is often recommended. In high-stress or demanding environments, shorter intervals may be advisable to prevent wear and malfunctions.

Can I install a more powerful hydraulic aggregate in my tail gate?

A stronger aggregate should only be used if it is technically compatible with the cylinders, valves, controls and electrical system of the existing unit. Oversizing without a system check can cause damage or malfunction. All relevant parameters must be reviewed and manufacturer approvals considered before modification.

What is the significance of the operating voltage (12 V vs. 24 V)?

The operating voltage must match the vehicle’s onboard electrical system. Transporters and light commercial vehicles typically operate with 12 volts, while heavy trucks usually use 24-volt systems. An aggregate with incorrect voltage cannot be operated and may be damaged.

How do I find the right hydraulic aggregate for my truck lift gate?

Useful information can be found on the type plate of the aggregate or the tail gate: voltage, flow rate, maximum pressure, tank volume, as well as type and position of hydraulic and electrical connections. These technical details help identify an aggregate that fits both the existing system and the intended application.