The christmas tree valve is normally plumbed into both the pressure and suction lines with live pump. Pressure comes in the side and suction out the bottom. They inturn are plumbed parallel to rear tank. When using double action cyl,you lock the lever for the rear box and the oil recirculates through the christmas tree valve back to pump when in neutral. When raising imp oil is exposed to relief valve in reservoir. When using single action cyl, you lock the christmas tree valve and release rear lever using it to raise and lower imp again using same relief valve in reservoior. I don't know why you would have a seperate relief valve plumbed into system. Isn't a flow divider for power steering is it. At any rate, if christmas tree valve is not centering it would not hold a loaded double action cyl. Look at the on line parts manual under caseih for a layout of the connections.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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