Hitachi ZW180 Technical Manual page 324

Forward 2nd Speed
In case of forward 2nd speed, the forward clutch is
connected to the 2nd speed part of the 1st / 2nd
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 2nd
speed hub gear (9) through F-R gear (3) and idler
gear (7).
1st / 2nd Speed
Clutch
9
11
16
COMPONENT OPERATION / Drive Unit
1
4
Forward
Clutch
3
7
Power Flow: Forward 2nd Speed
In addition, torque is transmitted from 2nd speed hub
gear (9) to low-range gear (11), and finally to output
gear (16).
Input
Output
T3-9-18
T4GC-03-09-017