Unlike the piston pump, there appears to be no inlet & outlet plugs on the pump itself to permit the release of air (outlet) nor on the inlet/suction to allow the introduction of hydraulic oil. This leaves the outlet release point as the test port plug on the lower right side of center casting, near foot board/right brake. You can remove that and start to see if air on outlet is keeping it from pumping. I think this is not a high likelihood. Introduction of oil into the inlet is probably a better shot at success. This is done by applying compressed air to the dipstick hole with an air compressor blow-gun to help force oil up into the pump inlet. Other option is less desirable. Remove the pump, turn it upside down and fill it with oil, work pump to thoroughly coat insides with oil, being sure it actually pulls in oil at intake & forces it out the outlet when rotated. Pour oil into the suction line...gravity will never let you fill the line, but at least some oil will now be known to be in the line. If you need pictures of the test port location, view picture.
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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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