I've never done this and if you try it, proceed with caution.
I might try taking a pressure hose off at the lift cylinder, cycle the control valve and see what kind of flow/pressure you get. Pressure only on a gauge wouldn't tell you much.
I did something similar to this on my 1864 when I couldn't get the deck to lift so I took a hose off the control valve and noticed little or nothing coming out of the control valve going to the cylinder unless I cycled the steering wheel.
I guess the problem was in the PS box not letting flow through unless the steering was cycled. That wouldn't be your problem though as you have no PS.
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