The original factory selective control valve (SCV) would have used John Deere's own style of tips. Then later on there came a kit to convert them over to the ISO/Pioneer tip. Looking at the coupler you can tell by how far the barrels stick out of the couplers and also the appearance of the handle under the barrel.
This is the factory SCV coupler. Look how the barrels do not stick out past the valve body. They also have a noticeable taper to them. Also look at the handles under the valve. They have a round steel handle. This style takes the JD style tip.
This is what the JD style male coupler tip looks like. notice the taper on the first section of the tip.
This SCV has the ISO conversion kit installed in it. Notice how the barrels stick out past the valve body. They also have a rubber cap that will fit over the entire barrel. The older style has a rubber plug that fits inside the barrel not over it. Also notice how the handles are more square looking. They also are made out of Aluminum. This enables the SCV to use the IS)/Pioneer style of male coupler tip.
This is an ISO/Pioneer style male coupler tip. Notice how the first section of the tip is straight without the sharp taper the JD style has. This became the Industry standard in the late 1980s. On JD tractors this became the standard with the 50 series tractors. IE JD 4455 etc.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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