The 621 wheel loader and the 850D share the same engine a Cummins 6.590, as mentioned the fan shroud is an important as is the correct spacer between the fan and carrier,remove the thermostat and use the machine without it and see how it goes,if its still getting hot check the coolant for air bubbles,this is best done when it is hot,slacken off the fan belt so the water pump and fan will stay still, fill the rad to the top,start the engine and keep it at 800/900 rpm,watch the coolant for at least a few minutes,if you see air bubbles coming through it that indicates compression is leaking into the cooling system.could be head gasket,cracked head or cracked cylinder,if there is no air bubbles you can eliminate those things,had both the engines turbos on them,the pump settings would be different for a turbo and none turbo,is the transmission temperature staying in range.
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