The quick disconnects you have on all three lines are disconnected by pulling back on the knurled collar. You may have to push the connector towards the other line a little. Both the male and female ends of the quick coupler should seal when you remove them, so you won't need the cap. Make sure you connect (loop) the other two lines back together on the tractor - it looks like they alternated the male/female connectors so you can do this as long as you have enough hose length. I'm surpriised they used QC's, as they tend to add pressure drop and hurt the flow rate to the backhoe. Also, if the 3 pt hitch is original to that tractor, I don't think it is a 4500 but rather a newer version. A 4500 would have a single lever to control the 3 pt hitch, with a separate lever to select draft or position control. The two levers you have allow you to blend position and draft control, and came out in '76 with the X600 ag tractors.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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