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I have a 1989 Cat 426 backhoe that is somehow getting water in the transmission. I changed the transmission fluid today and it is milky looking. There is no signs of oil in the radiator though but water level was a little low. I'm guessing that my transmission cooler has gone bad. It appears the transmission cooler is inside the bottom portion of the radiator by following the hydraulic lines from the transmission. Are these things repairable or am I looking at possibly having to buy a whole new radiator? I can't see how you could repair the cooler part since it looks like it is internally inside the radiator without access unless the radiator was cut open. Would I have to buy another Cat radiator or would one from another brand of backhoe work? I'm finding out that these Series 1 Cat 426 hoe parts espicially used are not that plentiful. There is still a slight chance the water entered by other means since we have had heavy rain 5 days in a row last week here in North Carolina but I'm not holding my breath on that. Any help would be appreciated. Thanks.