Power Flows (page 3 of 6)

AUTOMATIC GEARBOX - JATCO

DESCRIPTION AND OPERATION

44-13

3rd Gear (D selected)

1 High clutch
2 Front planetary gear
3 Rear planetary gear
4 Low one-way clutch
5 Low clutch
6 Input shaft

7 Output shaft
8 Idler gear
9 Reduction planetary gear

10 Reduction one-way clutch
11 Reduction brake

On 3rd gear selection, the high clutch, the low clutch, and the reduction brake are engaged. During acceleration in 
3rd gear, the reduction one-way clutch is locked. Power flows from the input shaft in a clockwise direction to the high 
clutch through the front planetary carrier. The front planetary carrier is connected to the rear internal gear by the low 
clutch. The rear internal gear rotates clockwise at the same speed as the input shaft. The rear sun gear rotates 
clockwise at the same speed because it is connected to the input shaft and the rear internal gear. The rear pinion 
does not rotate. The rear planetary carrier rotates in the same direction and speed as the input shaft. The power flow 
from the rear planetary carrier is transmitted to the reduction gear via the output gear, idler gear, reduction internal 
gear, and the reduction planetary carrier. The power is then transmitted to the road wheels in the same way as 1st 
gear.