If JD would not have thought they were tough they would not have put them in the 4840s.The 50 series was much improved by adding the extra seven gears.The newer P.S. 4020s with side counsel are hard to come by and usually bring a premium.The minus is they require a double split in some instances and can be expensive to fix if you happen to have problems.I just talked to a man with a 4640 with 4100hrs that[according to him] had a 3/8 bolt come out and did a lot of damage resulting in a large bill.Anything mechanical can have problems but most people really like their powershifts.Many went to the south where inexperienced people operated them hoping they would have less problems and thats one of the reasons you dont see many left as they were used up.
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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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