I have the same Astra power steer pump in my Power Wagon, Should be more than good enough for the OKA . As Gav said , it's maybe too light on the highway , but wonderful wheeling around obstacles in the bush, the steering on these trucks is seriously heavy, and has the turning circle of the Queen Mary.
Sounds noisy here but can't hear it at all when engine is running.
https://youtu.be/dPCpUrlvnjI

