I have an old style Kubota B7100 HST. So I had been doing some brush hogging on a warm day recently for about an hour and a half when I saw a small amount of stream come out of the radiator overflow tube. I turned off the pto and drove the tractor for a minute and turned it off to let it cool down. I haven't done a lot of work in the heat with this tractor until now, but I keep the radiator pretty clean and that day was no exception radiator was fairly clean when it got warm. I checked coolant level after it cooled and it was maybe 1 cup low. I am guessing some steam had escaped before I had noticed it. No coolant leaks anywhere else on radiator, hoses, etc.
I read some posts on here and did some digging and didn't know how important the differences in radiator caps was. I have my parts manual so I checked and from what I can find using the parts number mine is supposed to be a 13 lb cap. I went back to my radiator cap and luckily the numbers had not completely worn off like almost everything else had, it clearly says 7lbs! I don't know for a fact that the radiator is original, but even if it is a replacement isn't it likely it would need a cap rated for higher pressure than 7lbs? Either way I ordered a 13 lb cap to give it a try. Is there any reason someone would purposefully put a lower pressure radiator cap on this tractor?
I read some posts on here and did some digging and didn't know how important the differences in radiator caps was. I have my parts manual so I checked and from what I can find using the parts number mine is supposed to be a 13 lb cap. I went back to my radiator cap and luckily the numbers had not completely worn off like almost everything else had, it clearly says 7lbs! I don't know for a fact that the radiator is original, but even if it is a replacement isn't it likely it would need a cap rated for higher pressure than 7lbs? Either way I ordered a 13 lb cap to give it a try. Is there any reason someone would purposefully put a lower pressure radiator cap on this tractor?