Hydraulic pressure is applied to the servo valve to engage the reverse selector with the countershaft 4th gear while the shift lever is in the forward range (, , and positions).
Hydraulic pressure is also applied to the 4th clutch, then the 4th clutch engages the mainshaft 4th gear with the mainshaft.
The mainshaft 4th gear drives the countershaft 4th gear, which drives the reverse selector hub and the countershaft.
Power is transmitted to the final drive gear, which in turn drives the final driven gear.
NOTE:
Hydraulic pressure is applied to the 1st clutch, but since the rotation speed of 4th gear exceeds that of 1st gear, power from 1st gear is cut off at the one-way clutch.
The illustration shows the 7-position transmission; 6-position does not have the sub-shaft and related parts.
Position in 4th gear
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and 
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