I recently purchased a 1980 Mitsubishi d2050 2wd tractor. The tractor starts and runs great. After about an hour of use it loses power and quits. I let it sit for an hour then it starts and runs again. I did a complete tune up, including radiator flush. Anyone know why it stops running after an hour.
If it's a diesel I don't know how you'd do a complete tune up, so I assume it's a gasser. But either way it could be a dirty fuel filter, or a clogged/calcified radiator which may need to be recored. Or it could even be a restricted fuel cap vent.
Does it show running hot by gage or radiator boiling over?
It could be a fuel cut off or if a gas some part of the electrical system getting hot and shorting out and cooling and thus running again.
However the first thing I would do is when this happens pull fuel line loose and see if it is flowing. Think you will find trash floating in there or fuel with gunk in it. Could be a filter, in a line or in the tank. If you have a clear fuel filter you may can just look at it to see if the fuel has stopped.
It is a diesel. It does not have a temp gauge but the radiator is boiling over from the overflow when this happens. I did replace the fuel filter on the line, not sure if there's one in the tank. Do you think it could be a thermostat or waterpump? Thanks for your help.
Hate to admit I am jumping on to EW band wagon here but want to add to his thoughts on over heating:
Are you running a proper antifreeze mix?
Is your air filter clean?
Sure there are no insect nest in the air system?
Have you tried washing out the fins on the radiator? Don't use high pressure or you can damage them. Use a good detergent.
Sure the water pump and thermostat are good?
And one of the lowest price is how is your fan belt? Even if slipping a little that can cause major loss of cooling. It normally pumps the water and drives the air so there is a load on it.
But the lowest cost one is, sure you are not over loading your tractor or using higher gear to pull load than you should?
I would check all down to the cooling system (radiator, pump or thermostat) and if it still does then get hold of a remote infrared thermometer and check the radiator for hot and cold spots in it. You might need someone to test this.
The tune up was. Changed all fluids and oils. Changed gas filter and air filter. Flushed radiator 4 times. There is no thermostat on the tractor. I took the housing off today and there was not one there. I tried to find a replacement but no one local carried one. The belt on fan is tight. Water is circulating in the radiator. I did spray the outside of the radiator with a garden sprayer to clean the vents. I am running a 5 foot brush hog.
tractor stalls after 1 hour: Mitsubishi -- Other Tractor Brands Discussion Forum
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