I haven't had any time lately to dig into the problem any further, but I thought I'd take the tractor over to my inlaws and use a larger compressor (that works!) to try to pressurize the oil reservoir.
I left the tractor running at approximately 1800 rpms. I removed the oil level check plug just behind the flow control valve. I then proceeded to pump air through the port into the reservoir. I probably had close to 10-20 pounds in it as it blew pretty hard when I took the nozzle out of it. While under pressure, I worked the control lever a few times from top to bottom. Still no luck getting the pump to prime.
There is very little oil coming from the socket head plug on the pump cover, making me think that the pump is just not priming. My manual says that this could be a result of a cracked casting or bad oring in the pump or on the suction line. Since I don't see any oil on the suction line that would lead me to believe the seal is bad on the suction line, I'm thinking it may be a bad seal in the pump not allowing it to prime.
It could also be a plugged filter or gummed up suction pipe too, so I will probably pull the pump tomorrow for inspection and if all looks good, pull the top cover again and see if I can't blow air back through the suction line (from the pump end) and see if it is open. From there, go through the cylinder and verify the control valves, etc, are free-moving and looking like they are doing what they are supposed to do.
If that doesn't work, I'm afraid I'm going to admit defeat and take it to the dealer to fix. This is the wrong time of year to have a tractor down... :cry:
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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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