Well I have a 1992 JD 6400 MFWD with a JD 640 loader. It just turned over 16,000 hours. One drive shaft and transmission input shaft, one head gasket, and several PTO switches. That is about all I have done to the tractor. It gets ran every single day.
Things to look for?? The rack and pinion axles and casting make the tractor be heavier in the rear for loader work. They commonly have a rattle in the transmission at dead idle, it should go away with just a little engine speed. Mine has done it since new. The cab models have to have the cab filters blown out regularly. I do mean every 50-100 hours. They pull the air off the floor in through the filters. Livestock guys with mud and manure on their feet, make dust that will plug the filters fast.
There really is not a common trouble area on them. They have been a real dependable tractor around here at least.
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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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