It's taking you too long to locate this problem.If you don't have a pressure lube you can use an air nozzle in the oil pressure gage fitting.With the pan off and air applied to the oil pressure fitting a major internal leak will be obvious.It happened to me one time when I was working late at night and was tired and left the top half of the rear main bearing out.All the oil was dumped through that rear main journal back to sump.If their is no obvious internal leak then pull the oil pump off and remove the end plate and check to see if the drive shaft key is sheared.Also check to see if the suction tube is pluged.
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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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