there is self leveling circuit that is tied into the bucket control side of the control valve, it consist of a self leveling bypass valve and a self leveling relive valve. i wish i could put a picture on here of what the control valve looks like. its extremely complicated to explain and understand what happens in a given scenario (where fluid is traveling when the self leveling circuit is operating). yes it seems that fluid is being dumped when you try to curl the bucket but im not sure where, i have changed both the bypass, and the relief valves one at a time from a parts machine, i have also changed the entire control valve from that machine to see if it might have been something internal that was causing weak, or bypassed fluid pressure. there is one solenoid that blocks fluid travel on the down side of the left boom cylinder when the key is off, or there is no weight in the seat. it does not affect the bucket hydraulics however. Other problem is most parts are unavailable for this machine i guess because of age mostly. i have no way to test these relief valves to know if they are in good order. the book specifies one as 1000 psi and the other at 1200 but i cant tell which is which. they both appear to be fine by visual inspection, spring looks good, ball seats fine, cant blow air through them so they seem tight but i cant test at what pressure they open...
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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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