The fan pump is the power source of the hydraulic cooling circuit of large excavators,also known as the cooling fan pump.Most of them are variable displacement piston pumps,and some models are gear pumps.The output pressure oil drives the fan motor to rotate,driving the cooling fan to operate and heat the water tank and hydraulic oil radiator.Different from belt driven fans,hydraulic fans can achieve stepless speed regulation based on engine water temperature and hydraulic oil temperature.Some models support fan reverse blowing to clean the radiator,and are mostly used for medium and large...