JUNCTION BOX GP 7W3467 - Caterpillar

Illustration 1 g03139016
Location of the power train components
(1) Output transfer gears
(2) Transmission hydraulic control
(3) Transmission planetary
(4) Upper drive shaft
(5) Torque converter updrive gears
(6) Torque converter
(7) Engine
(8) Front final drive
(9) Front differential
(10) Front drive shaft
(11) Support bearing
(12) Center drive shaft
(13) Rear drive shaft
(14) Rear differential
(15) Rear final drive Power from engine (7) is sent from the flywheel to torque converter (6). Power from the output shaft of the torque converter is sent to torque converter updrive gears (5).Power from the torque converter updrive gears is sent through upper drive shaft (4) to the input shaft of transmission planetary (3).The transmission planetary output shaft is connected to the input gear of output transfer gears (1) by splines. Power is sent through the input gear of output transfer gears (1) to the output gear. The output gear sends power through rear drive shaft (13) to rear differential (14). The output transfer gears also send power to front differential (9) through center drive shaft (12) and front drive shaft (10).The bevel gear, pinion, and gears of each differential turn the axle shafts to front final drives (8) and rear final drives (15). Final drives (8) and (15) turn the wheels.
Illustration 2 g03136017
Block diagram of the power train electronic control system
(3) Transmission planetary
(6) Torque converter
(7) Engine
(9) ( 14) Front and rear differential
(16) Engine Electronic Control Module (ECM)
(17) CAT Data Link
(18) Transmission neutralizer switch
(19) Transmission direction and speed control
(20) ET service connector
(21) Caterpillar Monitoring System
(22) Caterpillar Monitoring System service connector
(23) Power Train Electronic Control Module (ECM)
(24) Parking brake switch
(25) Service brake oil pressure switch
(26) Transmission oil pressure sensor
(27) Autoshift control switch
(28) Start relay
(29) Backup alarm
(30) Remote control brake light
(31) Remote control switch
(32) Parking brake oil pressure sensor
(33) Ride control switch
(34) Key start switch
(35) STIC lockout control limit switch
(36) Brake accumulator oil pressure switch for brake application
(37) Ride control solenoid valve
(38) Implement and steering solenoid valve
(39) Parking brake solenoid valves
(40) Solenoid valves (transmission clutch) (six)
(41) Lockup clutch solenoid valve
(42) Transmission output speed sensor
(43) Torque converter output speed sensor
(44) Parking brake oil pressure switch Six 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 (19). The autoshift control will make speed selections if autoshift control switch (27) 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 ECM (23) receives the operator input from transmission direction and speed control (19). 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) (40) that are selected. The Power Train ECM can request automatic shifts. The Power Train ECM uses the following input signal to ensure steady engagement