High efficiency hydraulic motor driven fans for excavators ensure the lowest possible power consumption while freeing up engine power for the main machine functions. Ever increasing noise emission restrictions on urban building sites requires carefully engineered cooling fans in combination with the cooling package shroud designs to minimize noise emissions. Our in-depth experience in selecting a fan that will meet the most challenging operating parameters can be validated by testing the fan in combination with the cooling package on our state-of-the-art wind tunnel before undertaking costly field testing of the machine.