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| Illustration 1 | g00293356 |
Location of Power Train Components (1) Diesel engine (2) Torque converter (3) Transmission (4) Output transfer gears (5) Rear final drives (6) Rear drive shaft (7) Front drive shaft (8) Front final drives | |
Power from diesel engine (1) is sent from the flywheel to torque converter (2). The torque converter is splined to the engine flywheel. The torque converter is fastened to transmission (3) by bolts. Power flows directly from the torque converter to the transmission input shaft. The torque converter output gear is meshed to the transmission input gear.
The transmission output shaft is connected to the input gear in output transfer gear case (4) by splines. Power is sent through the input gear to the output gear. The output gear sends power through rear drive shaft (6) to the rear differential. The output gear also sends power to the front differential through front drive shaft (7). The bevel gear and pinion of each differential sends the power to the final drives through the differentials and through the sun gear shafts. Axle shafts transfer the power to final drives (5) and (8) to the wheels. An integral parking brake is mounted on the non-engine end frame on the front shaft.
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| Illustration 2 | g03407575 |
Block Diagram of the Power Train Electronic Control System (9) Position sensor (left pedal) (10) Transmission direction and speed control (11) ET service connector (12) Cat Data Link (13) Caterpillar Monitoring System (14) Caterpillar Monitoring System service connector (15) Power train electronic control module (ECM) (16) Auto/manual switch for the Autoshift control (17) Transmission neutralizer override switch (19) Minimum engine speed setting (20) Engine (21) Engine speed sensor (22) Torque Converter (23) Solenoid modulating valves (transmission clutch) (six) (24) Transmission output speed sensor (25) Differential (26) Transmission | |
Six hydraulically activated clutches in transmission (26) provide four forward speeds and four reverse speeds. Speed selections and direction selections are made manually by using transmission direction and speed control (10). The autoshift control will make speed selections and direction selections if the machine is in automatic mode. The variable shift control uses the position of the variable shift control switch and the engine speed in order to provide additional autoshift points.
The power train ECM controls the following functions:
- neutral start
- ride control
- backup alarm
- secondary steering
- parking brake interlock
- transmission neutralizer
- transmission shifting