RickB is right about the internal pump. On the bottom of the bell housing is an access plate. Under that you will find a tube with a fitting on the end. That is where a diagnostic pressure gauge can be mounted to check the pump pressure (don't remember what it should be). A clogged filter can cause symptoms like this. Inside the transmission, at the bottom where you can't get at it, is a pickup tube with a screen on it (don't know of any way to clean it) that can cause this if clogged. One of the problems with leaving a tractor outside is that water can seep past the shift boot into the trans. Water mixing with the fluid causes trouble, maybe even ice. Anything else and yes, it can get expensive.
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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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