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When a loader is connected to the Allis hydraulic system, the hydraulic system is connected to both the loader and the rear lift cylinders. It sounds as though the rear port on the tractor is connected to a control valve which is connected to the rear port, the loader cylinders and the hydraulic sump of the tractor. With this system, no pressure will be exerted to raise the loader or change loader position until the tractor lift arms are in the fully raised position. Your separate control valves for the loader will hold the loader in any position but it will not be able to lift the loader unless the lever by the steering wheel for the lift is fully up and the rear lift arms are fully up. This rear outlet has two different varieties and I don't know which you have. One of them is called a transport valve and is used with large plows that require a delay for the lift arms to raise before pressure is put on the outlet. The other is simply an output and will always have the same pressure as the lift arm cylinders. This is why the loader won't go up until the lift arms are up. Until they are fully up, there is no pressure in the hydraulic line (unless you have a very heavy load on the lift arms - in which case loader performance is unpredictable). Some who don't like this system, buy a 4 way valve which can disconnect the lift arms from the circuit. But all this does is stop the lift arms from going up - the loader works the same. The traction booster is a way to transfer weight from a trailing implement to the rear tractor wheels. It does this by controlling the minimum pressure on the lift arms cylinder (in your case the loader cylinders as well). The more the traction booster control is raised, the greater the pressure. Apparently this level of pressure will raise your loader but may not if you have a heavy load in the bucket. You will not be able to use the lift arms when the loader is hooked up to the rear outlet. To use your lift arms, raise the bucket to a comfortable height and then disconnect the rear outlet. You cannot use the lift arms and the loader at the same time. I think I've covered all of your questions. Sorry for the delay in answering. If you like, my email is open so we can carry on a further dialog off line. I've helped a couple of friends add valves to their Allis tractors so they could do what they wanted.
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