Go BottomQuick Connect hydraulic lines JD650
 | Richard Burge
Join Date: Posts: 1 
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2001-04-11 26597
I want to thank all that responed to my original post. I don't have any type of hydraulic hookups installed on this tractor, so hooking up to a loader valve or power beyond isn't an option that I have. After looking in my service manual it seems as if I might beable to tap into the pressure side by unsrcewing a plug and just screw in the appropriate fitting, but I can't find anyway to tap into the return side. I don't know, maybe I am barking up the wrong tree. If that is so, I might just have to bite the bullet and buy a PTO pump and find a place to put a resevoir on the splitter.Richard
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-04-12 26628
Richard: Hooking up a splitter shouldn't to too difficult even without a loader PB SCV. Many tractors have a combination hydraulic manifold block that contains a pressure relief valve, ports for auxiliary systems and a divertor, or selector, valve. The manifold usually looks like a box that has two plugged ports and a slot-screw head (the divertor valve control). There are two large steel high-pressure lines and one small one on the box. I believe that an auxiliary system is connected by running a hose from the high pressure aux port to the inlet of the splitter--the inlet port should be stamped 'P' on 'IN'. It is very important not to confuse the two ports on the manifold or the splitter valve. To complete the connection, a hose is run from the remaining (outlet) port on the splitter to the other port on the manifold or directly to the sump. Most tractors have one or more plugged ports on the upper side of the transmission/differential cases for external return lines. If the return line from the splitter is run directly to the sump, then the 3ph won't operate when the aux system is selected, and that probably would be somewhat inconvenient. I am making an assumption that the splitter has its own control valve and it would not have PB. An ordinary control valve would work, but there are valves specifically for splitters that have additional capabilities. However, a ordinary valve with or without PB could be used for a splitter if the return goes to the sump rather than the manifold. PB valves have three rather than two ports. The ports are often marked 'P' for the inlet, 'PB' for the main return and 'T' for the cylinder return oil. The PB port runs to the return port on the manifold or to the inlet of another SCV. The ‘T’ port runs directly to the sump. As a side note (thanks to several comments from Bern who posts on other boards), I'll add a note about PB systems. The issue in power beyond systems is where the cylinder return oil goes. Return oil is generated by the displacement of oil on the passive side of a double cylinder that is being operated--move the cylinder shaft with pressure and oil on the other side of the piston has to go somewhere. If the cylinder return oil is put into a single return line, the return line will develop pressure if there is also an actuated control valve down-stream. In an open-centred system, an actuated control valve closes the centre, which blocks the return line and allows the pump to develop pressure. Otherwise oil simply is just pumped back to the sump through the open centre. The key here is that the cylinder return parts of SCV valves are not designed to withstand operating pressures. Operating several valves on separate SCV assemblies in series that lack PB may ruin the up-stream valve. At least, that's how I understand it. ....
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