Construction machinery pumps – Main and auxiliary hydraulic pumps

Efficient pumps for construction machinery are the heart of hydrostatic systems operating in demanding environmental conditions. The main task of these components is to convert mechanical energy from the combustion engine into liquid pressure energy, enabling the powering of kinematic systems in excavators, loaders, bulldozers, and other heavy working machinery. A properly selected pumping unit ensures precise control of attachments and optimal use of power from leading manufacturers' machines. In this section, we offer advanced hydraulic solutions, including specialized components such as the rotary OT200 M08 R/B25 B2 hydraulic motor, which works in closed and open systems of working machines as a hydrostatic energy receiver.

Application and technical characteristics

Hydraulic pumps dedicated to the construction machinery sector are structurally adapted for continuous operation under high dynamic loads. They are used in heavy-duty equipment where standard components would suffer premature wear due to sudden pressure spikes and high ambient dust.

• Working environment and resistance: Pump housings are made of high-strength spheroidal cast iron or hardened aluminum alloys. This guarantees resistance to vibrations, mechanical stress, and extreme external temperatures prevailing on construction sites.
• Pressure and thermal parameters: The offered components work at operating pressures ranging from 210 bar to over 400 bar for piston pumps. They are adapted to work in a wide range of operating medium temperatures, which allows for maintaining optimal oil viscosity.
• Media compatibility: The seal design ensures full compatibility with mineral hydraulic oils and synthetic fluids. To ensure failure-free pump operation, media with a high cleanliness class are required, which is facilitated by professional hydraulic filters installed in the return or suction system.

Why choose our components?

The most important criterion for choosing a hydraulic pump is its reliability and compliance with international engineering standards. Our products undergo rigorous bench tests, which minimizes the risk of costly downtime on the construction site.

• Compliance with ISO and DIN standards: All hydraulic pumps offered in our store are manufactured according to the highest industrial standards. The mounting dimensions of flanges and drive shafts meet unified standards, allowing for direct installation without the need for system modification.
• High volumetric efficiency: Thanks to minimal clearances between elements and precise fitting of pumping pairs, the pumps achieve optimal volumetric efficiency, which reduces energy losses and limits system heating.
• Modular construction: The possibility of using multi-section pumps allows for simultaneous powering of several independent systems using a single drive. For proper distribution of the fluid flow in such systems, precise hydraulic directional control valves with appropriate flow capacity are essential.

Technical specification – Main types of construction

Frequently Asked Questions (FAQ)

1. How to choose a hydraulic pump as a replacement for a construction machine?
Choosing a replacement requires verifying the main technical parameters: the geometry of the mounting flange and flange connections, the type of drive shaft (splined or keyed), geometric displacement (cm³/rev), and the direction of rotation (right, left). Incorrect rotation direction can lead to immediate destruction of the pump seal after startup.

2. What is the most common cause of pump damage in construction machinery?
The most common cause of failure is contamination of the hydraulic oil with solid particles or water, which leads to abrasion of working surfaces. For this reason, it is a technical necessity to regularly replace components such as hydraulic filters and ensure the tightness of system lines.

3. How does the OT200 series hydraulic motor differ structurally from the main pump?
The OT200 series hydraulic motor is an energy receiver where fluid flow forces the rotational movement of the shaft. It has dedicated drain ports that discharge internal leakage directly to the tank, protecting the shaft seal from high pressure in the working chamber. Main pumps generate flow and require different configurations of suction and pressure ports, adapted to power the entire system.

4. What system parameters decide about the service life of a hydraulic pump?
The service life of the pump depends on the efficiency of the filtration system, maintaining operating temperatures within the recommended range, and using safety valves to protect against overloads. The quality and viscosity class of the hydraulic oil itself also play a significant role.