Hi Clark, you are correct there is a flow divider in the MCV valve that splits the 9 GPM output of the hydraulic pump into 3 GPM for PS and PB and 6 GPM for 3pt and remotes. The brakes are supplied by hydraulic oil from the return side of the hydraulic oil cooler in front of the rad. The brakes are also a dead end circuit so any air that gets in the brake system stays there until the brakes are bled. Re your problem, try activating the remote control valve until your hear the relief valve squeal. Sometimes this will dislodge dirt stuck in one of the MCV valves. If the above dosen't cure the problem then it is time for diagnostics with hydraulic flow and pressure guages to determine if it is a weak pump or MCV valve problem.
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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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