953c hydraulic pump

I tried to follow the directions to the letter, but I didn't seem to get the expected results. Maybe I'm just a little simple.
The locknut between A and B doesn't seem to lock anything. Nut B doesn't seem to adjust anything. The allen screw in the end adjusts the pressure.
I did get the pressure to 3500 psi when the stroke ended on every function. However if there is a "low" pressure on this one I haven't found it. What would be the purpose of that 400 psi less, when exactly would you see it? From the procedure above it seems like only when boom up and roll back are both at the end of stroke. When I did that, I still got 3500.
Also, if the outside locknut is missing, it would have to be mighty thin, there's only 3 threads showing without it.

Try running the lift arms up until the hoist cylinders top out. In that position put the hoist lever in Hold and then measure the pressure when you put the tilt control into the Tilt Back position. Put an Allen key in the end of the adjuster and back it out about half a turn while keeping everything else from moving. According to the procedure each quarter turn should change the pressure by 110psi so whatever you measured using Tilt Back previously should reduce by just over 200psi. Even if it doesn't, try backing it out another half a turn and see what happens. Just keep a close track on how much you have backed it out. I'm wondering at this point if the inner adjuster has been screwed so far in at some point in the past and has bottomed out. You may have to back it out a lot more than you imagine.

I'd also suggest that every time you move the adjusting screw you should also measure the pressure you get when you put the hoist control in Raise. At some point the two pressures (using Hoist raise or Tilt back) should become different.

I understand the "only 3 threads showing" but if you look at the illustration on the previous page the locknut is only very thin.

I turned the Allen screw while holding the other nuts and it changed the relief setting for every function. So I set it at 3400-3450.
Before I changed the pump I removed the relief valve and disassembled it and found an aluminum shaving from under the B nut, so possibly that nut is stripped?
If the pressure never goes over the 3500, am I going to hurt anything?

The testing and adjusting procedure will be for the dual-pressure system controlled by the solenoid which we established you don't have back on the first page.

You should see the same pressure in lift and rack back.

The low pressure setting is (was) to give a bit more horsepower to the tracks.

Any idea why the T&A says nothing about the later system Chris.?

Not sure. I thought there was a service letter detailing the change but a brief search right now can't find it. I'm in a hurry but might be able to get back to it later.

I've been pushing brush with the machine, seems to be working properly, going to put a few hours on it and change hydraulic filters again and check the pressure.