Hey Random. I rebuilt the steering box on my 3400 recently. Staking the nut to the shaft is simple. The manual says to tighten the nut until all slack is removed, meaning just tight enough so the shaft can't be moved up and down, but no tighter. Then back off the nut about 1/6 turn, and stake nut to shaft. What they mean is use a hammer and a punch to peen the thin rim at the top of the nut into the slot that is machined into the steering shaft. This will lock the nut in place. I don't know what those blackened washer peices might be. My box had a broken washer under the nut, but yours is intact it sounds like. Got me there. When it comes to removing the hydraulic block, I was able to do it without losing the internals by cutting a coffee can lid in half, then cutting a notch in each half so it would fit around the shaft. I then slid the coffee can lid peices in from each side under the block while lifting the block slightly. Once the plungers are supported with the lid, you can lift the lid and the block off the shaft all together.
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