Drained and removed the hydraulic pump (thing is way heavier than it looks), no water in the fluid, and the valves appear to be good. Some grit came out, but doesn't look as bad as I thought it would be. Here are the leftovers from the bottom of the tank.
Drained the clutch and flywheel compartments. Most concerning stuff was in there. Not much water, a lot of sludge, and some metal pieces. They look like gear teeth, but too small to be flywheel teeth. Since I'm pulling the engine, I'll get a better look at this later.
Transmission fluid looked good. Clearly had a little water mixed in, but I've seen way worse. No grit or gear teeth in the bottom. Big relief.
Steering clutch compartment full of water and oil. At this point it's clear I'll have to replace the steering clutches... was already kind of planning on this though because of how the levers feel when I pull them.
Final drive oil was pristine.
I filmed all the drainings here. Skip to 13:06 to see the deluge of water from the steering clutch compartment.
Next up is pulling the radiator and injection pump. I've only snapped one bolt so far...I know it sounds silly, but this is my #1 gauge of how bad a project is. There's nothing that slows down progress more than a snapped bolt.
Not sure if I should keep posting in here, don't want to keep bumping this thread and spamming the forum and annoying everyone. Let me know if I should stop, otherwise I'll keep posting updates.