I scanned this diagram from the Blue Ribbon Service Manual (GSS 1278 - Hydraulics), which is invaluable if you start going into these hydraulics systems. They show the control valves, check valves, power steering, etc for the 240. They're on eBay all the time and well worth the $$.
It shows that high pressure thru line P flows to the hitch piston, which at the same time moves the check valve, closing off any passage to the return low pressure side. Therefore the hitch cylinder can't drop, even when you let off the control valve. When you reverse the lift control valve, high pressure goes to line Q instead, which breaks the check valve's hold, and also pushes the lift cylinder back down. If the O-ring on that check valve piston is gone, the high pressure will flow around the leaky piston no matter what position the control valve is in, and who knows what it will do?
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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