Hello! Looking for some input regarding the cooling system on my John Deere 850. After it is running for a while and gets warmed up, the radiator sends overflow into the clear plastic overflow tank, filling it and causing it to overflow onto the ground. Not sure at all what this means or what is causing it as I really don't understand how that system works. It seems like it would be a simple answer, but I am not really sure. Any input or direction would be welcomed. Thanks!
- Thread starter JedA
- Start date
Your little Yanmar-built DEERE 850 has a simple cooling system.
Nowadays, digital infrared "heat guns" are readily available and reasonably priced.
Check the temp at the front of the cylinder head, near the thermostat housing when it's puking coolant.
If really HOT, you could have a clogged radiator or a bad thermostat.
If NOT over the boiling point and puking coolant, you likely have a bad head gasket, a cracked head, or other issue that's allowing combustion products to leak into the cooling system and displace the coolant.
Nowadays, digital infrared "heat guns" are readily available and reasonably priced.
Check the temp at the front of the cylinder head, near the thermostat housing when it's puking coolant.
If really HOT, you could have a clogged radiator or a bad thermostat.
If NOT over the boiling point and puking coolant, you likely have a bad head gasket, a cracked head, or other issue that's allowing combustion products to leak into the cooling system and displace the coolant.
We had one at work for years, had a 6 foot belly mower and all it did was mow maybe three acres of grass a week. The only thing I ever remember having problems with was the radiator plugging up with grass, had to pull the screen out and blow all the crap out the front of the radiator almost every week or it would heat up. Other than that it was a trouble free outfit and the idiot kids that ran it didn't do it many favors.
Traditional Farmer
Well-known Member
- Location
- Virginia
My Yanmar 330 which is the same tractor as the JD 950 started dong the same thing I had the radiator cleaned by a radiator shop and it solved the problem.Could be just as simple as
crud between the fins in the radiator too.Do you have the removable screen in front of the radiator?
crud between the fins in the radiator too.Do you have the removable screen in front of the radiator?
Wow! Thanks for the quick replies. I really appreciate it. I had another guy say that the problem could be a head gasket also. In fact, we have a leak on the outside of the engine block and I figured that I was going to have to change the head gasket because of that problem. It looks like the problem has reared its ugly head in another place as well. So, how does changing out a head gasket go? I have looked it over and it seems fairly simple but are there problem areas that I should look out for? Again, any input would be greatly appreciated!
olgentdc
Well-known Member
buy a new radiator $285 from Fredericks Imports in Hartselle Ala. ,you will be money ahead ,you dont want THAT Ricepaper motor to run HOT , Guess How I know? my yanmar 2220 is nearly the same , riadiator as flimsy as foil paper. i cleaned mine and the guy said he feared it would not take a lot of heavy work . He was Right.
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