Kubota zd21 diesel zero turn keeps overheating. Only when the blades are engaged. I found and replaced a cracked head, mower will drive around fine without the blades on. Took mowing deck down and found spindle assembly flat worn out. So I replaced the bearings. Ran longer this time with the blades on but still boiled over. I moved the pto shaft that runs the the blade by hand, it seemed a little tight but engine was off so I assumed it probably has a pto brake that was applied. Looking for what to check now all spindles spin free now. Oh also to note my yard was mowed before I tried to mow with this kubota. The engine acts like it has a heavy load on it in the thicker parts of my yard, but grass was already cut to about an inch or two in length the day before.
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