SWITCH AS 2076132 - Caterpillar

power train is made up of four basic systems. The following systems are the four systems:
Electronic Programmable Transmission Control
Torque Converter
Transfer Gears and Transmission
Differential and Final DrivesThe four basic systems have a hydraulic connection, an electrical connection, a magnetic connection, or a mechanical connection.The operation of the power train begins at the Electronic Programmable Transmission Control (EPTC II). The EPTC II receives information of the selected speed of operation through the shift lever switch in the electrical system. The EPTC II uses the information from several switches and sensors in the electrical system to control the torque converter and the transmission hydraulic system. This is done by energizing the appropriate solenoids.The torque converter has a lockup clutch for the option for direct drive and a one-way clutch for torque converter drive mode. During the torque converter drive mode, the torque converter hydraulically drives the transmission. The torque converter is fastened directly to the flywheel of the engine.The lockup clutch solenoid is activated by the EPTC II when direct drive is necessary. When the lockup clutch solenoid is activated, the lockup clutch is hydraulically engaged. The rotating housing of the torque converter is mechanically connected to the output shaft of the torque converter. The drive shaft mechanically connects the torque converter to the transfer gears. The transfer gears are fastened directly to the transmission.The upshift solenoid and the downshift solenoid hydraulically activate the rotary actuator of the transmission. Movement of the rotary actuator mechanically selects the position of the rotary selector spool. The flow through the rotary selector spool hydraulically activated the correct valves in the pressure control group. These valves engage in the correct transmission clutches. This mechanically connects the transmission input shaft to the output shaft and the differential. The transmission will not drive the output shaft unless power is flowing through the torque converter. The power that is flowing through the torque converter can be hydraulic or mechanical.The transmission has six forward speeds and one reverse speed. The selection of reverse, neutral, or first speed is done manually. The selection of second speed through sixth speed is done automatically.Reverse uses only the torque converter drive mode. First speed has both a torque converter drive and a direct drive. Second through sixth speeds use the option of direct drive. Second through sixth speeds use the torque converter drive mode for a short time during the engagement of the transmission clutch. This provides smoother shifting. The transmission output shaft is fastened directly to the differential and the bevel gear. The differential and the bevel gear are fastened directly to the rear axle housing.After the transmission and the torque converter are connected, power can be supplied from the engine to the torque converter. Power goes from the torque converter to the transfer gears. The power then goes to the transmission. The power then goes from the transmission to the differential. The rear axles mechanically connect the differential to the final drives. The final drives are connected to the rear wheels.