Isuzu KB P190. Manual — part 1113

7A2-168 TRANSMISSION CONTROL SYSTEM (JR405E)

Third Gear

Legend

1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch

10. 2-4 brake

11. High clutch

12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl

The driving force from the input shaft (1) is transmitted
to the rear sun gear (5) and reverse & high clutch drum.
As in the case of the 1st gear and 2nd gear, the low
clutch (14) is engaged and the movement of the rear
internal gear (7) is restricted. Since the high clutch (11)
is engaged, the driving force from the input shaft (1) is
directly transmitted to the rear internal gear (7). As a
result, the speed of the rear sun gear (5) and the rear
internal gear (7) becomes the same as that of the input
shaft (1), so that the rear pinion gear rotates (6) not

independently but together with the rear sun gear (5)
and rear internal gear (7). When decelerating, the
engine brake is applied.

TRANSMISSION CONTROL SYSTEM (JR405E) 7A2-169

Fourth Gear

Legend

1. Input shaft
2. Front planetary carrier
3. Front pinion gear
4. Front sun gear
5. Rear sun gear
6. Rear pinion gear
7. Rear internal gear
8. Output shaft
9. Reverse clutch

10. 2-4 brake

11. High clutch

12. Front internal gear
13. Rear planetary carrier
14. Low clutch
15. Low & reverse brake
16. Low one-way clutch
17. Parking pawl

The driving force from the input shaft (1) is transmitted
to the rear sun gear (5) and reverse & high clutch drum.
Since the 2-4 brake (10) is engaged, the front sun gear
(4) is fixed. In addition to this the high clutch (11) is
engaged. As a result, the front pinion gear (6) rotates
itself together with other gears clockwise. This rotation
increases the speed of rotation of the front internal gear
(12) and is transmitted to the output shaft (8).