PISTON-CLUTCH 8P1892 - Caterpillar

The electronic system for the transmission consists of the following components:
Switch (inching pedal)
Position sensor (inching pedal)
Speed sensor (transmission input)
Speed sensor (transmission output)
Temperature sensor (hydraulic oil)
Pressure sensor (charge)
Switch (autoshift)
CAT data link
CAN data link
Transmission electronic control module (ECM)
Modulating valves (transmission clutch) (No. 1 through No. 9)Switch (Inching Pedal)
The switch signals the transmission ECM that the operator has fully depressed the inching pedal. The inching pedal is the left foot pedal that is located in front of the operator. The switch is located on the left side of the inching pedal behind the cover. Position Sensor (Inching Pedal)
The position sensor signals the transmission ECM of the position of the inching pedal. The inching pedal is the left foot pedal that is located in front of the operator. The sensor is located on the left top side of the inching pedal behind the cover.Speed Sensor (Transmission Input)
Illustration 1 g01324881
Speed Sensor for the Input to the TransmissionSpeed sensor (1) signals the transmission ECM of the speed of the input shaft of the transmission. The sensor is located on the top of the transmission.Speed Sensors (Transmission Output)
Illustration 2 g01324877
Speed Sensors for the Output from the TransmissionSpeed sensors (2) signal the transmission ECM of the speeds of the output shaft of the transmission. The sensors are located on the front side of the transmission toward the middle.Temperature Sensor (Hydraulic Oil)
Illustration 3 g01324878
Temperature Sensor for the Hydraulic OilTemperature sensor (3) is located on the left side of the transmission.The temperature sensor signals the transmission ECM of the hydraulic oil temperature.Pressure Sensor (Charge)
Illustration 4 g01324879
Pressure Sensor for the TransmissionPressure sensor (4) is located on the left side of the transmission.The pressure sensor signals the transmission ECM of the hydraulic oil pressure of the transmission.Switch (Auto Shift)
The auto shift switch is located in the cab.The autoshift function enables the transmission to automatically shift through speeds.CAT Data Link
The CAT data link is located in the wire harness. The connector for the CAT data link is located in the cab.The CAT data link is a serial communication bus that is used in order to communicate with the following components:
Caterpillar electronic technician (ET)
Other OEM electronic control modulesCAN Data Link
The CAN data link is located in the wire harness. The connector for the CAN data link is located in the cab.The CAN data link is a serial communication bus that is used in order to communicate with the following components:
Transmission ECM
Other OEM electronic control modulesTransmission ECM
The transmission ECM controls the following components:
Hydraulic control valves
Transmission modulating valvesModulating Valves (Transmission Clutch)
Illustration 5 g01335035
Nine modulating valves (5) for the transmission clutches are located on the top of the transmission. Each valve has a designated letter, as shown. The letters have been cast into the transmission case. The designated letters are used to correlate the modulating valve (transmission) to the corresponding transmission clutch.The modulating valves control the hydraulic flow of oil to the clutches in the transmission in order to engage the different gear ratios.