You should be able to lower as slow as you want and the engine may well be laboring. If you move lever far enough so it quits laboring you are opening the spool valve quite a bit. Some valves have feathering slots in them for better control and yours may not have them. The laboring is caused by the regulator port being opened before the return port is opened and if you do not need down pressure you can turn the spool on the valve to single action for lowering. The cover on valve is marked S and D with a roll pin to control max movement either way. You may possibly have a check valve,( seperate block mounted on aux valve) but I doubt it . That could give you problem with feathering drop. I have taken the balls out of a lot of them on loader tractors for convenience.
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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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