So I was reading another post that stated "komatsu only used atf II or III in USA produced trucks (serial # ends or starts with an "A")

My serial# ends with an A and the fluid color was red. I plan to use some dexron III fluid I have on the shelf. I didn't get a chance to take a good look but does the ATF get filled thru the dipstick hole or is there a designated plug?

I will try to update as I progress