What are the root cause of Diesel Engine over heating in hydraulic excavator?

Answer 1

Low coolant, Thermostat, But mostly with these machines operating a lot with dirt and sand. They need to be blown out regularly because of the areas they work in and the pressure the fan puts through the radiator to keep it cool. Air hardly ever get stuck in the radiator fins , But all those little particles of dirt and sand tins to build up through the cores that dissipates the heat. And there is generally another cooler that covers half of the radiator space about an inch and a half in front of the radiator. And if one OR both of the hoses from that oil cooler is not tighten down properly it could leak just enough that you may not see it until you have to tear them apart for cleaning and see that you have and inch and a half greasy dirt cake between them both and the other half of the radiator may be clogged up with dirt. which takes a few hrs alone to clean completely after you can get to them. with air hose then pressure wash.