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	Fan Drives
	GEAR PUMP & MOTOR FAN DRIVE COOLING SYSTEMS
	FANDRIVE Capacities up to 40 cc/rev Speeds up to 5,000 rpm Pressures up to 200 bar Sauer-Danfoss produce a range of hydraulic gear pumps to gear motor drive systems specifically designed to provide control for engine cooling fans. These custom built systems enable the truck / bus operator to obtain cooling fan performance which is directly related to operating conditions & not just to engine speed. Large commercial vehicles suffering long periods of stationary running can now be kept at the desired operating temperature.       ADVANTAGES THERMOSTATICALLY CONTROLLED OPERATION The engine coolant sensor signals when it is necessary for the cooling fan to start or stop. Ideally the sensor is placed within the top hose area of the engine cooling system. Hysteresis between on & off modes is approximately 2ºC. MODULATED FAN SPEED CONTROL To ensure the cooling fan operates at optimum speed the control is modulated between 0 & 3000 rpm VARIABLE ENGINE SPEED TO FAN SPEED Varying the combination of pump & motor sizes means it is possible to arrive at the correct engine to fan speed ratio for optimum performance. CUSTOM DESIGNED INSTALLATIONS The switching valve can be supplied as free standing or flange mounted onto the fan pump outlet port. The type & position of temperature sensor can be determined for any particular installation. Ordering SNP-Fandrive Description Define required fan speed. Define KW cooling required in system. Define system as 12V or 24V DC. Define vehicle application or type. Temperature Oil temperature should be between +30ºC & +60ºC during normal operation. Oil life is greatly reduced if temperature exceeds 60ºC. As a general rule, oil life is halved for each 8ºC temperature exceeds 60ºC. Filtering It is necessary to keep the level of contamination within a hydraulic system at an acceptable level to ensure trouble free operation. Filtration should always be specified at a level that protects the most sensitive item or component in the system.