REGULATOR 9N5020 - Caterpillar

Temperature Sensors
Hydraulic Oil Temperature Sensor
Illustration 3 g03372378
Hydraulic Oil Temperature Sensor
The temperature sensor for the hydraulic oil informs the ECM of the temperature of the hydraulic system oil. The sensor is designed internally to change resistance based on the temperature of the hydraulic oil. The Implement ECM uses a pull up resistor to receive sensor voltage and convert the voltage to a temperature reading. The resistance range for this sensor is 33,650 ohms at −40° C (−40° F) to 18.6 ohms at 150° C (302° F).Demand Fan Pressure Sensor
Illustration 4 g03660528Switches
Fan Return Filter Bypass Switch
Illustration 5 g03660497The bypass switch is a pressure switch that shows whether the filter is plugged and the filter is being bypassed. The bypass switch is a normally closed switch. The bypass switch will open at 137.9 27.6 kPa (20 4 psi) differential pressure notifying the ECM that the filter is plugged. The bypass switch provides a ground signal to the ECM when closed.This switch is one of the inputs that is used in order to drive the "system indicator" in the instrument cluster. This indicator is turned ON when the switch is in the open position and the oil temperature is greater than 52° C (126° F) with the engine running.Fan Motor Case Drain Filter Bypass Switch
Illustration 6 g03660525The fan motor case drain filter bypass switch is a pressure switch that shows whether the filter is plugged and the filter is being bypassed. The bypass switch is a normally closed switch. The bypass switch will open 137.9 27.6 kPa (20 4 psi) at differential pressure notifying the ECM that the filter is plugged. The hydraulic filter bypass switch provides a ground signal to the ECM when closed.This switch is one of the inputs that is used in order to drive the "system indicator" in the instrument cluster. This indicator is turned ON when the switch is in the open position and the oil temperature is greater than 52° C (126° F) with the engine running.Implement Tank Oil Level High Switch
Illustration 7 g03660887The implement tank oil level high sensor is a switch to ground input to the implement ECM. The component is a sensor that function as a switch. The implement tank oil level high sensor is used to monitor the implement tank oil level.implement Tank Oil Level Low Switch
Illustration 8 g03660890The implement tank oil level low sensor is a switch to ground input to the implement ECM. The component is a sensor that function as a switch. The implement tank oil level low sensor is used to monitor the implement tank oil level.Outputs
The ECMs respond to decisions by sending electrical signals to the outputs. The outputs can create an action or the outputs can provide information to the operator or the service technician. The outputs of the ECM are listed in tables .Solenoids
Illustration 9 g03660495Engine Cooling Fan Solenoid
The engine cooling fan solenoid controls the fan piston pump pressure compensator to increase or decrease fan speed.Data Link
Cat Data Link
The Cat Data Link is an input/output of the ECM.