Offline Filtration for Construction Machinery

Offline Filtration Units, Housings and Filter Elements

• Offline filtration units: standalone systems for continuous circulation of tank oil
• Filter housings: designed for defined filter elements and flow capacities
• Filter elements: selected based on particle size, contamination load and oil condition

Offline filters operate outside the main hydraulic flow and directly process the tank oil volume.

Application in Hydraulic Systems

Offline filtration is used when the oil in operation does not meet the required cleanliness class or needs to be improved.

Typical applications include continuous oil conditioning, tank cleaning and filtration during filling or transfer processes.

Offline filtration extends return filters and pressure filters by adding a separate filtration loop outside the main system.

Flow Rate, Filtration Rating and Tank Volume

The flow rate defines how quickly the tank volume is circulated.

If the flow rate is too low, the oil is not conditioned effectively. If the filtration rating is incorrect, contamination remains in the system.

Flow rate, filter element and tank volume must be matched.

Particle Contamination, Water Content and Filter Elements

Offline filtration reduces solid contamination and, depending on the filter element, also removes free water from the oil.

The key factor is whether contamination is caused by particles, water or a combination of both.

Stationary and Mobile Offline Filtration Systems

Stationary offline filtration units are permanently integrated and operate continuously in the background.

Mobile offline filters are used for service operations, oil conditioning and filling procedures.

Mobile and stationary systems differ significantly in design, flow capacity and application.

Typical Mismatches in Practice

• Flow rate: too low – insufficient oil circulation
• Filtration rating: incorrect – contamination remains
• Application: wrong setup for continuous or service use
• Filter housing: not compatible with selected filter element
• Filter element: not designed for particle or water removal

Mismatches result in slow cleaning, unstable oil quality or ineffective filtration performance.

Offline Filtration within the Hydraulic Filter System

Offline filtration is part of the hydraulic filtration system and extends filtration beyond the main circuit.

This category includes offline filtration units, filter housings and filter elements.

Offline filtration complements return filters, pressure filters and hydraulic filter elements with an additional filtration stage.

Check Before Ordering

• Application: stationary or mobile system
• Tank volume and required flow rate
• Filtration rating and oil conditioning target
• System type: unit, housing or element
• Type of contamination (particles / water)