It sounds like a diverter valve, The ones I'm familiar with (such as my 1710 which has a position control hitch) go ahead of the 3ph control valve and direct flow to either the 3ph or an auxiliary system. On these systems anything powered from the auxiliary system has to have its own control valve assembly. It sounds like the diverter valves comes after the 3ph control-valve and directs flow to either the loader or lift cylinder. The arrangement may be common on 961's but I don't think it would be possible on my type hitch. Never the less, the plumbing should work by connecting the splitter valve return line to the other loader line. It should be a line going directly to the sump. However, even if the plumbing works, whether it's a good idea is another question. I don't know if controlling a splitter from a 3ph control-valve is appropriate. Splitter valves usually are a bit specialized and have a release detent. Splitters also have doubling acting cylinders so they are powered in both directions. The 3ph control valve probably couldn't be plumbed to power double-acting cylinders. A splitter valve probably could be powered from the loader circuit, but the 3ph lever would have to remain continuously in lift mode. Again, I'm not sure if that's a good idea.
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