FARMALL H lift all system

hey i have a 1949 farmall h tractor and it has a hydraulic hose on the right side of the tractor by the belt pulley. i know that has pressure on that hose because i pulled back the lever. i would like to try to hook it up so i can have a single hydraulic cylinder on an auger or something and run it but i need a inlet back to the tractor and i dont have that.

i figured that i have an outlet because there is pressure on that hose so i need a inlet so it can cycle back to the tractor or am i thinking wrong. and there is a hole A and a Hole B on the left side i have the manual for the tractor amazingly the original one that came with the tractor back in 1949. well if anyone knows let me know thanks. shane

All 3 holes will have pressure at the same time. You can only use a single acting cylinder on this tractor. Just hook the cylinder to any for the outputs and it will fill the cylinder to lift what ever you need it to, and when you push the lever back down it will backflow, putting the fluid back in the tank.

Your Lift-All system is a "single-acting" system. Oil under pressure comes out of the one port on the right side, and/or the two ports on the left side. The oil can be used to move a cylinder, and when pressure is released by moving the lever all the way forward, the oil flows back to the pump reservoir through the same line. Gravity is used to lower the implement which the cylinder raised.
The only times you need a return line to the reservoir is if you are using it to run a hydraulic motor, or a double-acting cylinder. In the case of the motor, oil is in a continuous loop flow from the pump through the motor and back to the reservoir. That return line can be plumbed into the fill-port with a pipe tee.
If you desire "double-acting" hydraulics, which can move a cylinder both directions, you'll need some additional valving. IH offered a "Christmas tree" attachment that mounted a valve above the fill-port and provided directional control. Those are uncommon, and cost $$$. It will be cheaper to do it with aftermarket parts, and that won't be exactly cheap, either.
Keep in mind that your hydraulic system only works when the clutch is released, and is low-pressure by modern standards.

If you want to run a hyd motor or some other type of constant flow device there is a way to "cheat" and make it work. The threads on the inlet cap to the resivour is the same size and type of threads as a pipe union, 3/4 I thimk, (measure and check) Put a pipe union on the fill cap and plumb the retirn line to there. keep in mind that these old critters were low preasure/high volume. you will have lots of speed, but low power at the motor.

On my H, a pressure line from the pump is run to a double lever valve mounted by the right headlight. From there, it's plumbed so one lever runs the one way lift cylinders on the loader and the other lever is plumbed for a two way dump cylinder on the bucket.

On yours, in it's simplest form, you can run a one way cylinder by simply engaging or disengaging the pump. Depends on how elaborate you need to go.

On my H, a pressure line from the pump is run to a double lever valve mounted by the right headlight. From there, it's plumbed so one lever runs the one way lift cylinders on the loader and the other lever is plumbed for a two way dump cylinder on the bucket.

On yours, in it's simplest form, you can run a one way cylinder by simply engaging or disengaging the pump. Depends on how elaborate you need to go.

One hole on each side is for the individual cylinder on each side of the front section of the cultivator and the second hole on the one side is for a cylinder with delayed lift for the rear gang of the cultivator. We only used the one outlet on ours (Tractor was 35 years old when hydrolics were added, none before) for a single acting cylinder on a 9' haybine. Traded tractor off in 1983 on a larger tractor to pull 3 bottom plow as was no longer making hay, all row crops, so do not remember the outlet that was used.

As others have said the original system is designed for a one way operation. Pull the pump rod all the way out and the ports are activated. Push it halfway and it locks the oil in the cylinder. Push it all the way in and the oil will flow back through the supply hose to the reservoir. If you are considering using it in such a way that the oil has to return to the reservoir other than through the supply hose, I have a recommendation. Running a return hose into the fill/vent pipe will make a big mess if not done properly. If a large amount of oil is returning (large cylinders) the vent will not be able to discharge enough air to allow the oil in through the same pipe. The result is hydraulic fluid running out the vent like a gusher. I have first hand experience of this result. I ended up having to make an expansion tank of sorts to let the hydraulic fluid flow into until enough air could escape to let it flow back into the reservoir. This was a rig at best although it worked. I would have preferred to run the return hose into a elbow screwed into the bottom drain plug of the reservoir. That way the vent can expel the air since it is not sharing the same pipe as the return. I didn't do this as my hoses had already been sized for running into the top of the reservoir. Just something to consider if you are going to make changes.

so like today"s implements it has one hose in the front then like one hose in the back of the cylinder so it can move the implement up above ground or in the dirt. that would be a double action hydraulics right.

then that single action is just one hose to the cylinder right then the gravity lets it come down,

You've got it!