Turolla OCG has over many years built up a wealth of experience with its hydraulic and electro-hydraulic fan drive systems for vehicles and machines operating both on and off highway. Modern fan drives require proportional electronic control to meet new emissions legislation. SGM2 and SGM3 fan drive motors are based on the proven high performance Turolla OCG gear motors.
A proportional pressure relief valve with pilot operated spool (normally closed) is integrated in the cast-iron rear cover of the motor. A gear pump supplies oil to the fan drive motor. The PWM signal to the solenoid pressure relief valve controls the oil flow through the motor which determines the fan speed. The fan speed is controlled to maintain optimum engine and hydraulic system temperatures. The SGM2YN, SGM3YN, SGM2VC and SGM3VC provide this proportional control in an integrated package within the rear cover.
Bi-directional fan motor capability is necessary when it is desired to switch the rotation of the fan blade for such reasons as cleaning debris from a radiator. This allows for more efficient cooling of the machine engine and functions. The SGM2NC and SGM3NC provide the bidirectional capability for use with remote, inline mounted HIC manifolds that provide the reversing flow. The SGM2VC and the SGM3VC integrate the reversing valve capability in the rear cover of the motor.
