I was able to look at and drive the 4630 today. I'll post pics later this evening of each area when I get home.
Seems to be relatively leak free. There was some evidence of oil at the rear of the oil pan and on the clutch cover on the front of the trans. I hope it is not a rear main seal leak.
Some evidence of oil at the intake hoses coming from the turbo.
It passed the power on, in high gear, brakes on, clutch out test. The clutch didn't show any signs of slipping, it just killed the tractor as I slowly let the clutch out.
I wasn't able to lift anything with the rear lift, but I seemed to operate fine. The PTO cycled on and off with the handle. The PTO shaft did move in and out enough that you could feel it move - in observation it appeared to be about 1/32nd of an inch or less.
Radiator was not quite full, but fluid looked good. Oil looked okay.
Loader readily lifted tractor. Joystick control worked well. The major pins didn't seem to have any wear or slop. However, the joint on the side bracket did move with pressure. There were only 2 bolts on each side and appeared there should have been a third bolt. I looked at the attachment points and case all around the bottom joint areas and didn't see any evidence of cracks.
There was no evidence of play in the steering arm joints, though the boots were all dry rotted and broken.
The engine seemed to run fine. I don't really know how much vibration to expect from these machines by experience. There happened to be a resonant vibration in the floor boards right at the PTO mark on the tach. It would go away above and below that RPM. It only showed a little evidence of black smoke when first started and when increasing the throttle rapidly. The turbo seemed to spool up nicely when turning or as the load increased up a slight incline.
I ran it out in all gears, H-L, 1-4 and used the shuttle shift to go forward and back, then went through them again in 4WD. Unfortunately, I was only able to operate on pavement and I not convinced I did a good check on 4WD. The drive train seemed to make a little more noise in 4WD, Hi in the upper gears, going fast, but not more than I might have expected from my experience with military vehicles from 1/2 to 5 Tons. The brakes worked and would allow me to steer slightly even on the pavement.
The tires are a little dry, and the right rear definitely has at least one patch in it.
The hydraulic hoses are dry rotted for the most part, but don't seem to be leaking.
The seat is all torn, but was mounted on a nice suspension unit of some type. It moved up and down softly, but maybe the hydraulic part of it needs some service (there may have been some air in it by the sound).
The light worked in the front. The dash instruments seemed to work, except the hour meter, of course. There are 4 lights along the bottom. Only 3 lit up. The 3rd one didn't light. What should it be? I wish I had taken a picture of it with the 3 lights on. I forget what the first one was. The second was like an arrow pointing down with a line across it. The far right looked like a crank case with a rod, which I assumed to be oil pressure. Once it started all the lights went right out. The temp gauge on the right seemed to work and only climbed mid range into the green and stayed there during my 20-30 minutes or so of operation, and the fuel gauge on the left showed empty (what do you expect from a dealership).
I was surprised that it had a Carrerro front axle. For some reason I thought that was only used earlier on, like in a 6600.
He quoted me a $13.2K price. What do you think? (I think they are quite confident they can sell it, they have gotten interest from a buyer in Ohio)