SOCKET 1P4524 - Caterpillar

The power train is made up of the following three basic systems:
Power Train Electronic Control Module
Torque Converter
Transmission Planetary and TransmissionThe three basic systems have a hydraulic connection, an electrical connection, a magnetic connection, or a mechanical connection. Power is supplied from the engine to the torque converter and then goes to the transmission. If the transmission is in gear, power flows from the transmission to the output shaft. The operation of the power train begins at the power train Electronic Control Module (ECM). The power train ECM receives information about the selected speed of operation through the shifter in the electrical system. The power train ECM uses information from several sensors in the electrical system to control the torque converter and the transmission hydraulic system by energizing the appropriate solenoids.The rotating housing of the torque converter is fastened directly to the engine flywheel. The torque converter has a lockup clutch for direct drive and a one-way clutch for torque converter drive. During torque converter drive, power is transmitted through the torque converter hydraulically to the transmission. During direct drive, there is a direct connection between the engine flywheel and the transmission.The power train ECM will hydraulically activate the lockup clutch solenoid for direct drive operation. The full power from the engine flywheel is transmitted through the torque converter when the torque converter is in direct drive. The lockup clutch becomes a direct connection between the rotating housing and the output shaft of the torque converter. The output shaft of the torque converter is connected to the planetary. The power train ECM will activate the appropriate electronic clutch pressure control (ECPC) valves to activate the correct transmission clutches when shifts are needed. The transmission clutches mechanically connect the transmission input shaft to the output shaft. Different combinations of clutches result in different gears and transmission output shaft speeds, as shown in Table 1.
Table 1
CX35-P800 Transmission Clutch Assignments    
Operation     Gear Ratios     CLUTCHES     Transmission Output Speed at 800 RPM Input with LUC Engaged (RPM)     Transmission Output Speed at 2200 RPM Input with LUC Engaged (RPM)    
1 2     3     4     5     6    
Neutral                             O     −     −    
1 Forward     5.73                 O         O     140     384    
2 Forward     3.57     O                     O     224     616    
3 Forward     2.72     O             O             294     809