Well the first would be to drop the three point hitch before you start the tractor. Start the tractor at idle. Lift the three point ASAP. It should raise smoothly but not really fast. This is a simple test of the charge pump and main hydraulic pump. If either of them have much wrong then the three point lift will jump/chatter when lifting at idle with the front oil reservoir empty.
As for coolant issues and cavitation the Mannheim tractors are not much different than the Waterloo tractors. The Engines used in the Mannheim tractors are good motors. Smaller and less torque than the their Waterloo cousins but they are supposed to be smaller. So just the usual check the fluids before starting them for oil in the coolant system and water/milking stuff in the oil.
Drive it and see if the brakes are smooth or chattering and grinding. Check how the park brake holds/works.
Then for usage/wear. Look at the drawbar hole and the drawbar front pin/hole. The Drawbar may have been replaced, the front casting/hole would show wear if a lot of drawbar work had been done. Check the three point hitch for wear. Check the steering system for worn/sloppy steering components.
Here is my advice after doing theses things. IF the hitch chatters up when lifting at start up then walk away. The many possible hydraulic issues that can cause this are rarely cheap to repair. It the lift is smooth but the brakes are chattering or grinding walk away. Brake lining material and or metal from the brake disk will travel through the complete hydraulic system in short order if the tractor has been ran long with brake issues. Repairing the brake system is not too expensive but the possible damage to the rest of the hydraulic system is the kicker. The park brake is not too hard to repair but does require the final drive be removed. So while it is not terrible it is not cheap either.
The engines really do not worry me. The problems they usually have are no much different then any other tractor to fix. Yes it may cost money but your usually 100% sure you have it fixed when your done. The hydraulics can only have that level of confidence after going through the entire system and that is cost prohibitive in most cases.
DO not listen to fellows that tell you that the hydraulic system repairs on these tractors is not that high. That is only true in maybe 20% of the cases of hydraulic trouble. The more normal cost is on the $5-10K range. YES $10K. I have done several JD Mannheim tractors that only had hydraulic issues and had it cost $10K plus. A big part of this is labor. When the system get contaminated you can easily have to remove repair every single hydraulic component to full repair the system. The usual repair is in the $5-6K range If it includes the main pump and charge/transmission pump.
Truthfully I would rather someone buy an older JD Waterloo tractor than a unknown Mannheim tractor. A good JD 3020 can be bought for about the same money as JD 2750. The potential problem cost are not even in the same league. Just an example.
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