All the breaks in my early 4020 parts catalog are on serial numbers and most are at 91,000, but some are at other numbers before 200,999 that is the last number this book covers. There were significant changes made a 91,000, but not a signifficnt as those made at 201,000. There were essentially three models called 4020, those before 91,000, those after 201,000 and those in between. Those after 201,000 are known as "side console" and bring a premium. The differences are so great pre side console and side console that the parts catalogs and the shop manuals are separate and different. Some parts interchange, some will fit, but shouldn't be interchanged, some don't interchange and the hydraulics are drastically different.
It IS important to have the correct parts catalog and shop manual to fit the tractor at hand else you will be confused and can cause damage with improper tests and adjustments.
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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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