Well with out putting a gauge on it we are both guessing , but here goes. IF it will not engage after you shut it off and tryed to restart then i am GUESSEN that the tiny little pin that holds the two halfs of the valve broke . So to fix it if that is the problem then your going to have to drop the draw bar support and unhook the linkage and remove the valve out the bottom of the PTO unit . This can be done with mim. fluid loss IF you fast at getting the plug back in . When you re install the valve then your going to need the test port fitting and a gauge capable of reading 600 PSI to reset the pressure HOT and myself i would set the pressure at around 240-260 psi .
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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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