Early and late has to do with how the suction and pressure lines connect. Early has a flange that bolts to the pump. Late has a suction that has a o ring that presses in and the high pressure has a flare nut connection.
Never heard about the difference between 2000 and 3000, thought they were identical. In any event, bet either one will bolt right in. Tractor data shows 1 gpm more flow on the 3000 model. If you installed a 2000 one I seriously doubt you will notice the difference unless you are running a loader or other high volume hydraulics on the pump. The 3000 and 2000 were pretty much identical in most aspects.
Maybe Ultradog will amble in shortly and help you with that question.
This post was edited by Hogleg at 10:46:17 02/21/13 2 times.
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