The plunger is a valve spool. There should be a seal in the body around it.
If you go over to the n tractor club site library and look under Implements>Loader, you will see a Davis 99-101-102 Operator's manual and right below it a Davis 101-102 parts manual. The Operator's manual looks like the right base part number but a 2 suffix not the 3 suffix AGCO currently lists on the 690379M3. The parts manual publication number (651027M91) is different Than the publication number 651095M91 for the current parts manual (which does not come up at the AGCO on line parts books) but the valve is similar or the same. Those manuals should help you. Here is the info where you can get to the AGCO on line parts books and AGCO publications. As for parts you can try a Massey Ferguson or AGCO dealer. Massey acquired Davis loaders, and developed them further as their own. I believe you may find the valve is an AICO, and likely no longer in production.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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