Hydraulic oil coolers and accessories

No hydraulic system turns all of its input power into useful work. Pressure drops across valves, internal leakage in pumps and motors, and friction convert part of it into heat, often 20 to 30 percent of the installed power. The reservoir and pipework shed some of that heat, but in most systems not enough. A hydraulic oil cooler removes the surplus and keeps the oil at its working temperature, usually between 40 and 60 °C. The required size is determined by the heat load of the system and the difference between the oil inlet temperature and the ambient air or cooling water temperature. You can find any hydraulic oil cooler and the accessories you need at DTA in the Netherlands.

Hydraulic oil coolers are available for a wide range of heat loads, supply voltages and mounting situations. They are subdivided into two main categories: air-oil coolers and water-oil coolers. Air-oil coolers are driven by an AC, DC or hydraulic motor, or come as a complete offline unit with their own circulation pump. Water-oil coolers are available in brazed-plate and shell-and-tube versions. Thermoswitches, bypass kits, dust and stone guards and mounting clamps complete the installation. Our specialists will gladly help you choose the right combination.

Air-oil coolers with AC motor

An electric AC motor drives the fan. The standard choice for stationary industrial systems, also available in low-noise and marine versions.

Air-oil coolers with DC motor

A 12 V or 24 V DC motor runs on the machine’s on-board supply. The obvious choice for mobile machinery, also available in a low-noise version.

Air-oil coolers with hydraulic motor

A hydraulic motor drives the fan directly from the hydraulic system, so no electrical connection is needed. Suited to mobile and off-road machinery with high heat loads.

Offline cooling units

An air-oil cooler with its own motor and circulation pump. It cools oil from the tank independently of the main circuit, so cooling continues when the machine is idle.

Water-oil coolers

Where cooling water is available, water-oil coolers remove large heat loads in a compact housing. Brazed-plate coolers suit clean water. Shell-and-tube coolers are more robust and, in suitable materials, handle seawater.

How much cooling you need depends on the installed power, the duty cycle, the oil temperature you want to maintain and the highest ambient or cooling water temperature. As a guide, divide the heat load by the entering temperature difference: a 12 kW heat load with 60 °C oil and 30 °C ambient air requires at least 0.4 kW/°C, plus a margin for hot summers and fouled fins. Our specialists calculate the heat load, select the right cooler and advise on fitting it in the return line or as an offline unit. Contact our team before you order one of our oil coolers.