CUP 0649053 - Caterpillar

Illustration 1 g00947342
Location of the power train components (1) Output transfer gears (2) Upper drive shaft (3) Transmission planetary (4) Transmission hydraulic control (5) Torque converter (6) Engine (7) Front final drive (8) Front differential (9) Front drive shaft (10) Front support bearing (11) Center drive shaft (12) Rear support bearing (13) Rear drive shaft (14) Rear final drive (15) Rear differential (16) Torque converter casePower from engine (6) is sent from the flywheel to torque converter (5). The torque converter is connected to the engine flywheel by splines. The torque converter is fastened to the transmission by bolts. The torque converter output gear is meshed to the transmission input gear.The transmission output shaft is connected to the input gear of output transfer gears (1) by upper drive shaft (2). Output transfer gears (1) is attached to rear differential (15). Power is sent through the input gear of output transfer gears (1) to the output gear. The output gear sends power to rear differential (15). The output transfer gears also send power to front differential (8) through rear drive shaft (13), center drive shaft (11) and front drive shaft (9) .The bevel gear, pinion and gears of each differential turn the axle shafts to front final drives (7) and rear final drives (14). Final drives (7) and (14) turn the wheels.
Illustration 2 g00991042
Block diagram of the power train electronic control system (3) Transmission planetary (5) Torque converter (6) Engine (8) (15) Front and rear differential (17) Transmission neutralizer switch (18) Transmission direction and speed control (19) ET service connector (20) CAT Data Link (21) Caterpillar Monitoring System (22) Caterpillar Monitoring System service connector (23) Power Train Electronic Control Module (ECM) (24) Autoshift control switch (STIC) steering for the autoshift control (25) Engine speed sensor (26) Solenoid valves (transmission clutch) (six) (27) Transmission oil pressure sensor (28) Transmission output speed sensorSix hydraulically activated clutches in the transmission provide four forward speeds and four reverse speeds. Speed selection and direction selection are made manually with transmission direction and speed control (18). The autoshift control will make speed selections if autoshift control switch (24) is in the automatic mode.The power train electronic control system electronically controls transmission shifts. The power train electronic control system shifts the transmission. In order for the transmission to be shifted to the desired speed and the desired direction, Power Train Electronic Control Module (ECM) (23) receives the operator input from transmission direction and speed control (18). The Power Train ECM signals the solenoid valve (transmission clutch) of the speed clutch that is selected. The Power Train ECM signals the solenoid valve (transmission clutch) of the direction clutch that is selected. The output signal energizes the solenoid valves (transmission clutch) (26) that are selected. The Power Train ECM can request automatic shifts. The Power Train ECM uses the following input signals to ensure steady engagement of the clutches: engine speed sensor (25) and transmission output speed sensor (28) .The Power Train ECM also controls the following functions: neutral start,