I'll add to what Tim stated to get a engine & hyd oil test kit along with a coolant test kit from your local JD dealer. I would also recommend looking at the hyd filter unless it had just recently been changed. Back when I worked for a JD dealer when the 40 series were relatively new it was unheard of for the JD engine cyl liners to get a hole in them from nasty antifreeze but today it's common.
Also if either prospective tractor has the hyd hi-lo or pto option I suggest to operate hyd's utilizing all the functions of these 2 mentioned options.
This post was edited by Tx Jim at 12:28:05 02/09/13.
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