Hydraulic pumps and hydraulic power units

Hydraulic power packs with constant delivery 100-350 bar

Our hydraulic power packs with constant delivery in the pressure range from 100 to 350 bar are an excellent solution for continuous hydraulic applications. Find out more about our selection in this category.

• Hydraulic power pack with petrol engine up to 60 hp
• Hydraulic power pack with diesel engine up to 275 hp
• Hydraulic power pack with electric motor up to 40 kW

Pressure transducer

How does a hydraulic pump work

A hydraulic pump works according to the positive displacement principle. Mechanically sealed chambers are formed in the pump, which periodically increase and decrease in size. This displacement causes the hydraulic fluid to be conveyed from the suction port to the pressure port of the pump.Simply explained:

• Imagine a glass of water and a straw.Insert the straw into the glass and suck on it. This creates a vacuum in the straw, which draws the water upwards. If you remove the straw from the water and close it with your finger, the water remains in the straw. If you now remove your finger from the straw, the water flows out of the straw due to the pressure.
• Insert the straw into the glass and suck on it
• This creates a vacuum in the straw, which draws the water upwards.
• When you remove the straw from the water and close it with your finger, the water remains in the straw
• If you now remove your finger from the straw, the water flows out of the straw due to the pressure

In a hydraulic pump:

• The mechanical movement of the pump (e.g. by a motor) enlarges and reduces the chambers
• This creates a vacuum that draws in the hydraulic fluid
• The displaced fluid is then pressurised and pumped into the system's circuit

The efficiency and performance of a hydraulic pump depends on several factors, including the design of the pump, the quality of the hydraulic fluid and the precision with which the system is designed and maintained. Hydraulic systems utilise the fact that fluids are non-compressible to control and move very precise and powerful movements and loads.

What types of hydraulic pumps are there?

There are many different types of hydraulic pumps, which can be categorised according to various criteria. A common classification is based on the operating principle:

• Gear pumps: These pumps use gears to displace the hydraulic fluid. They are simple and robust, but not as efficient as other pump types.
• Piston pumps: These pumps use pistons to displace the hydraulic fluid. They are more efficient than gear pumps and can generate higher pressures.
• Vane pumps: These pumps use vane cells to displace the hydraulic fluid. They are quiet and have low pulsation, but are not as pressure-resistant as piston pumps.

Another way to categorise hydraulic pumps is by their adjustment range:

• Fixed displacement pumps: these pumps always deliver the same amount of fluid
• Variable displacement pumps: The flow rate of these pumps can be adjusted to suit requirements.

Choosing the right hydraulic pump depends on various factors, e.g. the required flow rate, pressure, speed and area of application.

Here are some of the most common applications of hydraulic pumps:Construction machinery: Excavators, cranes, wheel loaders, etc.Agricultural machinery: Tractors, combines, harvesters, etc.Industrial equipment: Presses, punches, conveyors, etc.Mobile hydraulics: Lifts, forklifts, work platforms, etc."

When should a hydraulic pump be serviced or replaced?

The maintenance or replacement of a hydraulic pump depends on several factors, including the pump's operating condition, performance, age and specific manufacturer recommendations. However, there are general signs and guidelines that indicate that maintenance or replacement may be required:

Maintenance required:

• Irregular noises: noises such as cracking, creaking or grinding may indicate internal problems, such as worn bearings, damaged gears or insufficient lubrication.
• Drop in performance: A reduction in efficiency or pressure that causes the hydraulic system to no longer respond as expected may indicate wear or blockages in the pump.
• Temperature increase: An unexpected increase in operating temperature may indicate pump overload or inefficient operation, often caused by contamination or deterioration of the hydraulic fluid.
• Leaks: Leaks in the pump or system indicate seal wear or cracks in the components.

Replacement required

• Critical wear or damage: If critical components such as the pump housing, drive shaft or internal pump elements (e.g. pistons, gears) are damaged beyond repair, replacement may be necessary.
• Cost-effectiveness: In cases where the cost of repair and maintenance exceeds the cost of a new purchase or if an older pump no longer works efficiently, replacement may be more cost-effective.
• Technological overhaul: With the introduction of newer, more efficient and more powerful pump technologies, replacement may make sense to increase the overall efficiency and performance of the system.

Maintenance tips for hydraulic pumps

• Regular inspection: Routine inspection of the pump and system helps to identify and rectify problems at an early stage.
• Change hydraulic fluid: The hydraulic fluid should be checked regularly and replaced according to the manufacturer's instructions to minimise contamination and wear.
• Clean or replace filters: Clean filters are critical to protecting the pump from contaminants that can cause wear.

It is important to follow the manufacturer's specific maintenance instructions and recommendations and consult professionals if unsure. Regular maintenance and timely replacement are crucial for the reliability and longevity of hydraulic systems.

What are hydraulic power packs and how do they differ from hydraulic pumps?

Hydraulic power packs and hydraulic pumps are both central components in hydraulic systems, but have different functions and characteristics.

Hydraulic pumps

A hydraulic pump is a device that converts mechanical energy (supplied by a motor or other source) into hydraulic energy. This is done by the pump drawing in a fluid (usually an oil) and moving it through the system under pressure. The main function of the hydraulic pump is to generate the flow of fluid required for the system to function. It is the centrepiece of every hydraulic system and determines the efficiency and performance of the system.

Hydraulic power units

A hydraulic power unit (also known as a hydraulic station) is a complete unit that combines various components of a hydraulic system into a single package. In addition to the hydraulic pump, a typical hydraulic power unit also contains a motor (to drive the pump), a reservoir for the hydraulic fluid, filters to clean the fluid, valves to control the fluid flow, and pressure gauges and other sensors to monitor system pressure and condition. Hydraulic power packs are designed to provide a complete solution for the generation, control and application of hydraulic power.

Difference hydraulic power pack & hydraulic pump

The main difference between hydraulic pumps and hydraulic power packs lies in their scope and function within a hydraulic system:hydraulic pumps are individual components whose main task is to move hydraulic fluids. Hydraulic power packs are comprehensive systems that contain one or more hydraulic pumps and also include all the necessary components and systems to enable a complete hydraulic function.

In short, while the hydraulic pump is an essential part of any hydraulic system, the hydraulic power pack is a complete, ready-to-use solution designed for specific applications or in situations where an integrated hydraulic solution is required.