Suction Filters for Construction Equipment
Suction filters are installed on the suction side upstream of the hydraulic pump. They retain coarse contamination from the oil flow and protect the pump from harmful particle ingress.
Selection based on reference number, design, flow rate and installation setup. Incorrect selection leads to increased suction restriction, cavitation or malfunctions in the hydraulic system.
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In-Tank Suction Filters, Line Suction Filters and Spin-On Suction Filters
- In-tank suction filters: filters designed for installation inside the hydraulic reservoir
- Line suction filters: filter housings installed in the suction line outside the tank
- Spin-on suction filters: replaceable suction filter units for defined thread and installation configurations
- Screen and wire mesh designs: typical constructions for coarse filtration on the suction side
The key factor is the installation position between reservoir and pump. In-tank filters, line suction filters and spin-on designs differ in construction, system integration and service accessibility.
Suction Filters by Reference Number, Design and Flow Rate
Suction filters are identified and matched to the existing system based on reference number, design and required flow rate.
Visually similar filters often differ in size, thread, internal construction or micron rating and are not automatically interchangeable.
Correct Flow Rate Sizing on the Suction Side
The decisive parameter is the maximum flow rate on the suction side. The filter must be sized to avoid excessive restriction in the oil supply to the pump.
Incorrect sizing results in increased suction restriction, cavitation or instability in pump operation.
Suction Filters in the Reservoir and in the Suction Line
In-tank suction filters operate inside the reservoir and are directly influenced by oil level, suction position and tank geometry. Line suction filters are installed externally in the suction line and defined by housing, element and installation orientation.
Typical suction filters operate with coarser filtration ratings, commonly in the range of 60 µm, 125 µm or 250 µm. The priority is correct suction-side design, not maximum filtration fineness.
Depending on the system, suction filters differ in design, filter media, micron rating and additional features such as bypass configurations.
Matching Elements and Accessories for Suction Filters
Suction filters are directly related to hydraulic filter elements used within the respective suction filter assembly.
Related components include line filters for defined installation positions and components from the hydraulic filter accessories range.
These must be distinguished from return line filters, which filter the oil on the return side before re-entering the reservoir.
Selection Criteria for Suction Filters
- Reference number: exact identification of the existing suction filter
- Design: in-tank, line suction or spin-on filter
- Flow rate: matched to pump demand and suction conditions
- Installation setup: reservoir or suction line configuration
- Micron rating and construction: suitable for suction filtration without excessive restriction
Check Before Ordering
- Reference number of the existing suction filter
- Design type: in-tank, line suction or spin-on
- Flow rate / size
- Thread, connection or housing configuration
- Installation position between reservoir and pump
Suction Filters within the Hydraulic System
Suction filters are part of the hydraulic filter category and operate on the suction side between reservoir and hydraulic pump. Correct selection depends on compatibility with the existing suction line, installation setup and required flow rate.
Technical Support
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