You need to read this paragraph from the WSM:
The hydraulic shuttle clutch, which switches forward and reverse running, function as the traveling clutch. When
the clutch pedal (2) is depressed, the clutch spool of shuttle valve (8) moves via the clutch cable (9).
As for the oil, it does not flow to both the forward side (5) and reverse side (6) of the clutch pack, the clutch pack
enters the state of “Disengaged” and power is not transmitted.
I interpret this English to say that the shuttle clutches and the foot pedal traveling clutch are one and the same.
I have attached several WSM pages. Hope that an adjustment is all that is needed because the shuttle shift works properly.
Dave