Hydraulic Pumps

What is a Hydraulic Pump?

The hydraulic pump is the heart of every fluid power system. It converts mechanical energy (from the electric motor or combustion engine) into hydraulic energy. In doing so, it generates a volume flow, which in turn builds up pressure as soon as it meets resistance (e.g., a cylinder or motor).

Our range covers the entire spectrum: From the robust external gear pump for standard applications to the high-precision axial piston pump for high-pressure systems. Whether you need constant flow (fixed displacement pump) or want to regulate the flow according to demand (variable displacement pump) – at LöSi® you will find the right pressure generator.

Advantages of Our Hydraulic Pumps

A pump must be one thing above all: Efficient. Inferior pumps often suffer from high internal leakage oil loss, which lowers efficiency and unnecessarily heats up the oil.

Rely on quality for maximum performance:

• High Efficiency: Optimized gap dimensions ensure high volumetric efficiency – the power gets where it is needed.
• Durability: Hardened drive shafts and high-quality bearings withstand even continuous loads at the limit.
• Versatility: We offer solutions for pressures from 100 bar to over 400 bar and displacement volumes from a few milliliters to hundreds of liters per minute.
• Robust Seals: Resistant to temperature peaks and various hydraulic media.

Typical Areas of Application for the Hydraulic Pump

Without a pump, the machine stands still. Our products drive the world of hydraulics in the most diverse sectors:

• Agricultural Technology: PTO pumps for log splitters or gear pumps in tractors.
• Construction Machinery: High-performance piston pumps in excavators for simultaneous movements (Load-Sensing).
• Industry: Quiet vane pumps in stationary power units and injection molding machines.
• Workshop: Simple hand pumps for hydraulic presses or emergency operations.

Selection Criteria & Technical Data

The wrong pump can destroy the entire system (e.g., through cavitation or excess pressure).

Define these parameters exactly before buying:

• Displacement (cm³/rev): How much oil is displaced per revolution? This determines the speed of your cylinders in combination with the rotational speed.
• Design:
  • Gear Pump: Inexpensive, robust, loud, medium pressures.
  • Piston Pump: More expensive, high pressure, adjustable, efficient.
• Direction of Rotation: Essential! Look at the shaft: Does the pump turn right (clockwise) or left? A wrong direction of rotation leads immediately to a defect.
• Shaft & Flange: Tapered (1:8), splined shaft, or feather key? Which standard flange (Euro, SAE, Bosch) is needed?

Select & Order Hydraulic Pump Now

Get your circuit going. Use our 40 years of experience and find the exactly matching pump for your system.

Browse through over 20,000 items. Use our filters for displacement and flange type. Inform yourself now, get advice, and order your new hydraulic pump directly online!