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| Illustration 1 | g03784681 |
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Solenoid valve (power shift electrical current) (1) Solenoid (2) Regulator | |
The solenoid valve for the power shift electrical current is located on the main pump regulator. The main pump regulator is used for horsepower control.
Solenoid (1) receives a pulse width modulated signal (PWM signal) from the machine ECM. The PWM signal that is sent from the machine ECM causes the solenoid valve to control pressure generated from discharge pressure. The engine speed and pump output oil pressure are inputs to the machine ECM which helps the machine ECM to determine the PWM signal that is required for the solenoid valve.
The PWM signal is a variable signal. The PWM signal allows the main pump to be controlled more precisely. The output flow of the main pump is controlled in accordance with the power shift electrical current. The power shift electrical current is used to control the maximum allowable hydraulic pump output when the engine is under load.
Power shift electrical current has the following effect on the main hydraulic pump:
- As power shift electrical current decreases, pump output increases.
- As power shift electrical current increases, pump output decreases.
The power shift electrical current ensures that the pump can use all of the available engine horsepower for the hydraulic system at all times without exceeding the output of the engine.
Reference: For more information concerning the pump regulators, refer to Systems Operation, "Pump Control (Main Hydraulic) (Main Pump Regulator)".