There are 2 front axle nuts on each side, The inner one has a pin on it that gets tightened first. Next there is a Washer with holes in it, which you Need to slide on. If the hole does not line up with the pin on the Inner nut, be sure to flip it around to see if it will, if not back off the Inner Nut till it does. Then install and tighten the outer nut.
I'm sure you don't need any help from this point in the assembly.
I have come across several of these kind of vehicles that have been reassembled wrong. The Pin on the inner nut has been broken off, or, bent over. A couple times I've found it being used as the outer nut.
Once you get it locked in place, it won't back off.