Hitachi ZW180 Technical Manual page 326

Forward 3rd Speed
In case of forward 3rd speed, the forward clutch is
connected to the 3rd speed part of the 3rd / 4th speed
clutch. The torque converter transmits torque to F
hub gear (4) which is meshed with input gear (1).
Torque from F hub gear (4) is transmitted to 3rd
speed hub gear (13) through F-R gear (3) and idler
gear (8).
COMPONENT OPERATION / Drive Unit
1
4
Forward
Clutch
3
7
Power Flow: Forward 3rd Speed
In addition, torque is transmitted from 3rd speed hub
gear (13) to high-range gear (14), and finally to
output gear (15).
Input
8
Output
T3-9-20
3rd / 4th
Speed Clutch
13
14
15
T4GC-03-09-019