SWING MOTOR 0996534 - Caterpillar

Illustration 1 g01154153
Basic diagram for the power train systems
Illustration 2 g00922222
Location of the power train components (1) Engine (2) Torque converter (3) Torque converter updrive gears (4) Upper drive shaft (5) Transmission (6) Output transfer gears (7) Center drive shaft (8) Oscillating hitch drive shaft (9) Rear drive shaft (10) Rear differential (11) Front differential (12) Front final drives (13) Wheels and tires (14) Front drive shaft (15) Rear final drivesThe power train is made up of four basic systems. The following systems are the four systems:
Power Train/Chassis Electronic Control Module
Torque Converter and Updrive Gears
Transmission and Transfer Gears
Differentials 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 Power Train/Chassis Electronic Control Module (Power Train/Chassis ECM). The Power Train/Chassis ECM receives information of the selected speed of operation through the shift lever position sensor in the electrical system. The Power Train/Chassis ECM uses the information from several switches and sensors in the electrical system to control the power train hydraulic system. This is done by energizing the appropriate solenoids.The torque converter has a lockup clutch 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 Power Train/Chassis ECM will activate the lockup clutch solenoid when direct drive is necessary. When the lockup solenoid is activated, the lockup clutch is hydraulically engaged. The rotating housing of the torque converter becomes mechanically connected to the output shaft of the torque converter through the lockup clutch. The output shaft of the torque converter drives the torque converter updrive gears. The upper drive shaft mechanically connects the torque converter updrive gears to the transmission. The transmission is fastened directly to the output transfer gears. When the lockup clutch is not activated, the torque converter drives the transmission hydraulically.The upshift solenoid and the downshift solenoid hydraulically activate the shift cylinder of the transmission. Movement of the shift cylinder mechanically selects the position of the selector spools. The flow through the selector spools hydraulically activates the correct valves in the pressure control valve. These valves engage the correct transmission clutches. This mechanically connects the transmission input shaft to the output shaft and to the differentials. 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 four forward speeds and one reverse speed. The selection of REVERSE, NEUTRAL or FIRST speed is done manually. The selection of SECOND through to FOURTH 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 FOURTH speeds use the direct drive. The torque converter will be in torque converter drive for a short time during transmission shifts. This provides