I have Bobcat 753 BOSS model During work of 1-2 hours everything is normal But then a heat engine starts to rise what could be the reason? The temperature sensor is OK Without thermosetting and free flow of water Inside the radiator you see water passing through, that means a proper water pump. radiator after cleaning I can not find the root cause Can anyone advise?
Put gauge on radiator, maybe bad head /gasket if pressure exceeds cap setting
Coolant as it should be Radiator after cleaning and releasing fillings There is no thermosetting so there is free flow of coolant I also put a mechanical thermometer in the engine and it shows the same thing as a watch panel I'm afraid it's something to do with a hydraulic oil ridator because it does not understand why it takes a long time until the heat starts to rise and then it does not go down even after a break of half an hour it immediately returns to climb upwards in 5 minutes
Are you running pure water in this, or an antifreeze mixture? Did you clean the outside of the radiator or the inside? How did you clean the radiator? Is the thermostat a double action where it blocks off a port when it opens up? Usually removing the thermostat is a bad idea. What outside temperature are you operating in? Have you taken the temperature of the inlet and outlet of the radiator when it's overheating?
That machine has a belt that turns the cooling fan, have you verified the belt is turning the fan properly?
I assume thermosetting means thermostat. The device that controls engine temperature by water flow? If it is removed it can cause some systems to overheat. This is because the coolant passes through the radiator to quickly to be cooled and entire system overheats. Some systems require a thermostat or restrictor plate.
I work with pure water I cleaned the outside by washing and pressing the air and the inside part by a professional who was passing to make sure there were no fillings The thermoset was completely removed which means I work without thermosetting The temperature outside is around 30C degrees I did not measure temperature at the entrance and exit of the radiator
There is a belt that turns the fan around, which makes you feel a breeze close to Bobcat
I did not understand why this could be a problem? Free flow of water can only help to cool faster, so that the water immediately passes through the radiator and should cool down I once had an old car that after I dismantled the thermostat the temperature did not even rise on hot days
Hot water enters the radiator. It needs time to give off it's heat. if it goes through the radiator in a few seconds, it doesn't have time to give off it's heat. It will exit the radiator almost as hot as when it entered. Slower water will spend more time in the radiator, say 20 seconds. It will give off a lot of it's heat and be much cooler when it exits. This cooler water will then cool the engine better and prevent overheating. Removing the thermostat is almost always a bad idea. Cooling systems are designed to run with it in. If you're having a problem, then fix the problem. Don't cover it up by removing the thermostat. That just leads to more issues later. Also pure water isn't the best coolant. It will boil far too early. Much better to use a mixture with a higher boiling point. Once it boils, you loose all cooling. This is what sounds like is happening to you.
Also make sure your cooling system is holding pressure. That raises the boiling point too and prevents overheating. Most often it's the radiator cap that leaks.
This is only a problem if the thermostat housing has an opening back to the engine. Many/most thermostats close the recirculation port back to the engine, and open the radiator passage when they get hot. When cold, the recirculation passage is OPEN, with the thermostat removed the recirculation is OPEN. I don't know what engine this is or what kind of thermostat it is, but it's a bad idea to remove a thermostat. Pure water is thinner and has a higher heat content, so it should work better than glycol for you. But that will also cover up a weak cooling system. The temperatures of the water in and out of the radiator will help. You might also have a mechanical issue, or hydraulic like you said.
If you have access to an infra-red temperature measuring gun try taking the temperature of the coolant hose feeding from the thermostat housing to the top of the radiator, and the one feeding back from the bottom of the radiator to the engine. You should see a difference of approximately 10 DegC if the radiator is functioning correctly. Anything less than 10 DegC is suspicious and would suggest that either the water is going through the radiator too fast to be properly cooled, or possibly the radiator is partially plugged internally. Using water as a coolant is very likely to cause internal blockages of the radiator tubes.
Well, at full throttle it should be more than just a breeze, it should kick up a dust cloud on each side of the machine as the air rushes out of the side louvers.
Each pound of pressure raises the boiling point 3 degrees F. While water may do a better job transferring heat at 212 or 100 degrees C it turns to gas.( steam ). All cooling is lost. With a 10 Lb cap you can get up to about 242 F by the book. Coolant adds around 20 F before it starts bowling. Hit the top right search block: JD 320 skid steer oil in coolant. A complete coolant or oil school with DCA additive is money well spent in the long run. Do those tests all the others mentioned first and put a thermostat in it.