Sense taking the pump off is not a difficult chore, I'll suggest pulling it and submerging it in a container of Hydraulic oil. Turning it back and forth while submerged, will get all the air out of it. Now try holding a thumb over the pressure port, while turning the input gear. Even a really worn out pump will produce modest pressure this way. You should be able to feel the rotation of the pump gears as they move fluid. If there is none, the top pumping gear may be free on the shaft. If it is, it will not pump. There may be a way to pin the gear, or have it machined for a drive key. I have seen this happen, and it is rare but difficult to find. Sticking a wooden stick down the port and turning the drive gear by hand will also point to this problem. Do not use the engine to rotate the pump with a stick in it! JimN
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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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