WHEEL GP-REAR 2797458 - Caterpillar

Inputs
The inputs describe the status of the machine systems. Two types of inputs exist. The inputs can be either a switch type or a sensor type. Switches provide an open, a ground, or a + battery signal to the inputs of the controller. Sensors (frequency, PWM, or voltage) provide a changing signal to the sensor inputs of the controller. The controller will recognize the following types of sensor signals:Frequency - The sensor will produce an AC signal (sine wave or square wave) that varies in frequency (Hz) as the condition changes.Pulse Width Modulated - The sensor produces a digital signal and varies the duty cycle as the condition changes. The frequency of the signal will remain constant.In some cases the operator is provided a manual switch that can be used to change a condition of the machine.Sensors
High Pressure Sensors
Illustration 3 g02263513Note: The values in Table 3 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 3
Operating Pressure 50 MPa (7252 psi)
Supply Voltage +7V ~ +14V
Output Signal 500 100 Hz (PWM)
Output Range 5% ~ 95% Drive Pump Pressure Sensor and Idler Pump Pressure Sensor
The drive pump pressure sensor and idler pump pressure sensors are inputs to the machine ECM. The drive pump and idler pump pressure sensors are located on the main control valve. The drive pump pressure sensor monitors the pressure of the drive pump oil in the front half of the main control valve high-pressure passages. The idler pump pressure sensor monitors the idler pump oil pressure in the rear half of the main control valve high-pressure passages.The pressure sensors send a pulse width modulated (PWM) input to the machine ECM. This pressure information is used for pump control and travel speed.Switches
Illustration 4 g02332474The values in Table 4 are for bench testing only. Values may not represent parameters for machine systems specifications.
Table 4
Activation Pressure 490 49 kPa (71 7 psi)
Deactivation Pressure 294 kPa (43 psi) MIN
Rating + 12V ~ +32V
0.01 Amp to 1 Amp
Pressure Range 0 to 10 MPa The implement pressure switch sends an input signal to the machine ECM. When the joysticks are moved from the NEUTRAL position for a boom RAISE, stick IN, stick OUT, bucket IN, or a bucket OUT operation, pilot oil is directed to the implement pressure switch. The increase of pilot pressure activates the implement pressure switch. The implement pressure switch sends an electrical signal to the machine ECM. The switch information is used to control engine speed and pump control. Also, an electrical signal from the machine ECM energizes the swing brake solenoid valve in order to release the swing parking brake.Note: The implement pressure switch does not detect a boom LOWER or a swing operation.The travel pressure switch detects a travel operation. The travel pressure switch sends an input signal to the machine ECM. The machine ECM uses the switch information to control the engine speed and pump control.Outputs
The ECM responds to decisions by sending electrical signals to the