WHE oil coolers are heat exchangers between the hydraulic oil and the surrounding air. They are mainly used in hydraulic systems of trucks, working machines and special vehicles, as well as in machines and industrial installations for cooling the working medium.

Maximum dissipated power: from 7 to 47 kW, flow rates from 80 to 190 l/min

WHE oil coolers are used to lower the thermal equilibrium temperature in hydraulic systems. Instead of increasing the oil capacity in a heavily loaded hydraulic system, a cooler is installed in the return line to dissipate excess heat losses generated during operation. Equipping the hydraulic system with a cooler extends the possibilities and extends the operating time of the system, while reducing downtime and repair costs.


WHE coolers consist of a heat exchanger, also known as a radiator, a fan with an electric motor, a steering wheel that causes all the air passing through the radiator to go to the fan, a thermostat and a mounting base. The radiator is made of aluminum in such a way as to ensure the largest possible heat exchange surface while being resistant to increased pressure. It is equipped with inlet and outlet connections and a connection for a temperature switch. This connector is made of bimetal and its task is to switch the fan motor on at an appropriately high temperature of the working medium.


  • Low pressure drop and high cooling capacity;
  • Easy to maintain;
  • Compact design and low weight;
  • Temperature switch (thermostat) included

Versions and accessories

WHE coolers are available in four main versions of the voltage supplying the fan motor: 12V, 24V DC and 230V or 400V AC. The coolers are equipped as standard with a temperature switch that activates the fan at an oil temperature of approx. 50°C. However, at an additional cost, you can choose a switch with a different – higher or lower – fan activation temperature.


In principle, the WHE series can be used as a replacement for other coolers. However, special care should be taken not to exceed the permissible pressures and flows. It should be noted that the flow occuring at the system runoff should be taken into account, which may be significantly higher than the flow in the discharge line, especially in the case of fast return movements of the actuators. Also, the thermal power should be at least equal to the radiator power that is replaced in the system.

Technical data of WHE coolers20152024203020402050
Maximum flow [l/min]80130140160190
Permissible dynamic pressure [bar]1515151515
Test pressure [bar]2525252525
Maximum thermal power [kW]714232947
Dissipation power [kW/°C]0.07-0.130.18-0.390.23-0.420.30-0.450.48-0.69