Long lever on left of seat is PTO, it's a goofy system that engages a shift collar, then an over-center dry disc clutch.
Your PTO clutch is rusted/stuck/damaged or out of adjustment, so it's engaged at all times, even when it's not supposed to be, therefore the shift collar grinds when you move the PTO lever to engage it.
Left lever by steering wheel operates hydraulic valve for remote hydraulic outlet/couplers.
Lever next to it, nearer the steering wheel, is the 3-point lever and connects to a Bowden cable that runs back by the seat base, and is the thing you found disconnected. Cable is apparently rusted/seized/ stuck. If the hydraulic pump is working, the 3-point hitch should operate when you move the little lever you found disconnected. Hitch is power up only, and MAY not drop from it's own weight without an implement attached.
The other little handle down there with the quadrant with the series of notches selects between depth control and load control, or a combination thereof.
Does it have power steering, and, if so, does it work? The reason I ask is that if the PS is working we know the hydraulic pump is running and at least partially functioning.
Which brings up another lever... the hydraulic pump disconnect lever, located low on the LH side of the tractor, below the clutch pedal area, Key #28 in the drawing. If it is in the wrong position, so the spring, Key # 32, is being extended, the hydraulic pump drive is mechanically disconnected.
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