John I don't know what 25-75 HP engines needed to be Tier 4 back in 2008. It was not AG tractors. I think that was other motors. That final date of 2013 is what the tractors where working off of. I called and asked a friend that is still an JD salesman about it.
The major tractor builders built a LOT of Tier 3 tractors last year just for inventory. They knew that there was going to be demand for them.
Another thing people are not talking about between Tier 3 and 4 is the added cost. On the smaller tractors (25-75 HP) it is between $3500-5000. On the larger tractors it is closer to $10,000.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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