RETAINER-SPRING 1470260 - Caterpillar

Power Train Electronic Control System
Illustration 1 g03029477The power train electronic control system uses sensors in order to determine the input from the operator and output from the components. Then, the signals from these sensors are used in order to control the machine. The system displays information for the power train on the Caterpillar Monitoring System display panel for the operator.Sensors detect the position of the controls and the state of the components. This information is sent to the power train ECM. The power train ECM sends current to the solenoid operated control valves. These valves respond by regulating pressure to the transmission clutches and the service brakes. Information on gear selection, warnings, service codes, and information from other machine systems are displayed. This information is shown on the display for the Caterpillar Monitoring System. The power train ECM determines the transmission clutch that will be engaged. The clutch is determined by the selected upshift/downshift switch and the position of the direction selector. The power train ECM then uses the speed sensors to measure the machine response. The modulation of pressure for each clutch is controlled in order to achieve continuous power and smooth shifting.For the service brakes, the power train ECM responds to signals from the position sensor in the service brake pedal. As the operator depresses the brake pedal, the electronic control system quickly adjusts corresponding brake pressures.The oil in the power train hydraulic system is cooled by the power train oil cooler. Oil from the torque converter is sent through the power train oil cooler before returning to the lubrication system.
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Diagram of the Power Train Electronic Control System
The Power Train Electronic Control System electronically performs three main functions for Track-Type Tractors.
Transmission Shifting
Braking
SteeringThe Power Train Electronic Control System also performs the following functions:
Parking Brake Function
Neutral Start Function
Warning Function
Backup Alarm Function The Power Train ECM also controls:
The Implement Lockout feature
EH Counterweight ControlsFor proper operation, the ECM must determine the sales model and the configuration of the power train of the machine. The inputs of the harness code are left open or grounded. The ECM interprets the status of the inputs of the harness code, and uses the inputs to determine the configuration of the machine.Power Train Components and Hydraulic System
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Power Train Components
(28) Final drives
(29) Planetary power shift transmission
(30) Steering differential and brake (left side)
(31) Planetary gears and brake (right side)
(32) Transfer and bevel gears
(33) Main drive shaft
(34) Torque divider
(35) Tracks
(36) Diesel engine Diesel engine (36) is the source of the mechanical power. Power flows from diesel engine (36) to tracks (35) through the power train.Diesel engine (36) transfers power from the engine flywheel to torque divider (34). Torque divider (34) transfers power through the torque converter turbine to main drive shaft (33).Main drive shaft (33) transfers power to the planetary power shift transmission (29). Transmission (29) has three speeds in the FORWARD position and three speeds in the REVERSE position. The speed clutches and the direction clutches of the transmission are electronically controlled. The clutches engage in