Gary,
Komatsu only used ATFII or III in USA produced trucks (serial # ends or starts with an "A") from 1980~2010 and recently switched to TO-4 spec 10w oil (TO-4 is a specification for oil) in its transmissions in 2010. So if the oil is clear, stick with 10w preferably TO-4spec.
The engine you mentioned above is a Komatsu made engine.
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