One thing I was trying to find out is about the control valve nearest the regulator block. On the powersteering tractors a U shaped hydraulic tube goes from it to regulator block. One used with powersteering only tractors only has one outlet hole torward front of tractor compared to 2 for non PS. If you have the PS type valve used with a non PS regulator block that may be a problem. The outlet holes have pipe plugs with regular valve and someone may have pluged single hole in PS valve if parts are switched around. Also with PS a passage is blocked with a plug beween control valve and top reservoir post,plug could be left in there if parts switched. Control valve is removed to remove plug and it may stay in post or control valve upon removing valve. Regular non PS tractor hydraulics won't work with plug in.
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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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