TRANSMISSION AR 1804716 - Caterpillar

Sensor (Steering Wheel)
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The steering wheel is a rotary position sensor that is used by the operator in order to steer the machine. The steering wheel connects to connector J1-16 at the machine ECM. The sensor for the steering wheel is a 500 Hz PWM rotary position sensor.There are four calibrated positions for the steering wheel. The full left position and the left spring position. The full right position and the right spring position. The spring positions are manually calibrated through the display. The full left and the full right positions are automatically calibrated. The full left and the full right positions are automatically calibrated whenever the steering wheel exceeds the current saved calibration values.Note: There will be two sets of calibrations due to the multiple operator stations.Sensor (Deceleration Pedal)
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The deceleration pedal is a rotary position sensor that is used by the operator in order to determine the speed of the machine. The deceleration pedal is used along with the speed dial and the propel lever in order to determine the speed of the machine. The deceleration pedal connects to connector J1-2 at the machine ECM. The sensor for the steering wheel is a 500 Hz PWM rotary position sensor.There are two calibrated positions for the deceleration pedal. The full down position and the full up position. The pedal is automatically calibrated whenever the pedal exceeds the previous saved calibrations. As an example, the pedal goes lower than the saved minimum calibration value. A new calibrated value is stored.Note: There will be two sets of calibrations due to the multiple operator stations.Sensor (Left Drive Speed) and Sensor (Right Drive Speed)
There will be two signals for each sensor for the motor. One of the signals will be primary and the other signal will be secondary. A speed sensor failure is diagnosed by comparing the signals between the primary and secondary signals and the signals of both speed sensors. The sensor for the left drive speed connects to connectors J1-25 (primary) and J1-15 (secondary). The sensor for the right drive speed connects to connectors J1-3 (primary) and J1-26 (secondary). The speed sensors are used in order to provide the actual motor speed to the ECM.Note: These sensors are internal to the motor group. Sensor (Engine Speed)
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The speed sensor is an input to the ECM. The sensor tells the ECM the speed of the system. The speed sensor is a frequency sensor. Frequency sensors produce a signal that varies the frequency as the condition changes. The sensor generates a sine wave signal as teeth from a gear pass the sensor. The sine wave is sent to the ECM. The speed sensor has two connections to the ECM (+ and -). The sensor connects to connectors J1-40 (positive) and J1-41 (negative). The ECM measures the frequency of the signal and the ECM determines the speed of the condition. The signal frequency is one pulse per tooth on the gear. For electronic engines the engine ECM sends the information for speed