IH should have retired the Liftall name when they changed from the transmission powered hydraulics to engine driven hydraulics. There is no commonality between the two systems. They didn't so it remains a source of confusion.
Live power refers to the later system as found on late SM and SMTA. Your tractor with the reservoir below the fuel tank will have no belly pump/reservoir combo. The pump is at the distributor/ignition location.
The Liftall actuating lever functions the same on both systems. They are both single acting and will not provide up and down pressure without an auxiliary valve like you are planning. Yep, for anything to happen, the Liftall lever has to be pulled back regardless of what valve is plumbed downstream.
The back plate on the later Liftall has three 1/2" NPT ports. I believe any of the three can be connected to the Gresen valve. I use the the top left port. There is one 3/4" (or is it 1", can't remember) port. That is the return when using an auxiliary valve supplied by an outside vendor . It is in the upper left side of the reservoir. I think its normal function is to check oil level.
If you have a belly reservoir and an undertank reservoir, your tractor has seen some alterations. Someone may have wanted greater reservoir capacity or two sources of hydraulic power. I built a H like that. Check to see if the transmission coutershaft extension still is in place to drive the belly pump if it has a belly pump/reservoir.
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