Filter Coolers

Dual-Function Protection for Fluid Health

Hydraulic filter coolers are specialised units designed to both filter and cool hydraulic fluid within the bypass circuit of a system. By combining these two critical functions, they help extend fluid life, reduce wear on components, and maintain optimal system performance – all without interrupting the main hydraulic flow.

At Hydraulics Online, we supply filter cooler units from a wide range of global manufacturers – including Argo-Hytos, Bosch Rexroth, and many others – with expert advice to help you select the right configuration for your application.

Our website shows only a selection of what we supply. For impartial advice and access to our full range of hydraulic components, contact our expert team.

Filter coolers. For impartial advice and access to our full range of hydraulic components, contact our expert team.

A hydraulic filter cooler is installed in the bypass circuit of a hydraulic system, where it processes a portion of the fluid flow. This flow is typically low-pulsation and consistent, regardless of the system’s working cycle. As fluid passes through the unit:

Solid contaminants are removed by the filter element
Heat is dissipated via an integrated cooler (air-oil or water-oil)

This dual-action process slows fluid degradation, improves cleanliness, and helps maintain stable operating temperatures.

Extended fluid life – low-pulsation flow reduces thermal and mechanical stress
Improved system reliability – cleaner, cooler fluid protects pumps, valves, and actuators
Compact integration – combines filtration and cooling in one unit
Energy-efficient operation – bypass circuit design avoids pressure loss in the main flow
Flexible installation – suitable for mobile, industrial, and marine systems

These features make filter coolers ideal for systems with high duty cycles, sensitive components, or demanding environmental conditions.

Why use a filter cooler in the bypass circuit? Bypass circuits offer a stable, low-pulsation flow ideal for consistent filtration and cooling without affecting main system pressure.

Can filter coolers be retrofitted into existing systems? Yes – many models are designed for easy integration into existing hydraulic setups.

Do filter coolers require regular maintenance? Like all filtration systems, filter elements should be inspected and replaced periodically to maintain performance.