There are three positions for the lever/rod. In the middle position the rod is pulled out and a small tab on the underside of the rod is hooked on the support. This is "hold" position. Hydraulic fluid is held in the cylinder/s and loads are prevented from lowering. In the pulled all the way back toward the operator, the system is in "lift" position, Fluid is pumped into the cylinder/s while held back. :lifting the rod against a spring toward the light bar, and pushing it forward is lower position, letting the cylinder go down. With only that one valve, it is an open center one way hydraulic using only one hose to lift and lower. Sometimes the little flat spring is broken and it can be replaced easily. Jim
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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