Old Thwaites Dumper Axle filling

[Smithy]

I am trying to sort out oil in the front axle. There are two hexagonal plugs and a slightly lower hex socket one. Am I correct in saying there are three separate sections, all to be filled level? Outer two with UTTO as it has wet brakes and the middle with EP80/90?

 

[Mick-the-fitter]

If it’s braked internally then use Utto/ Tractor Oil/ ATF. Top bung is the filler, middle bung drain, bottom one drain will have a magnet, or should have, you will have to drain the hubs separately as the drain is below axle level! If you jack front left and rear right wheels and take off the handbrake you can turn them to the correct places for draining and then do same on the opposite corners.