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Message: <blockquote data-quote="Tazza" data-source="post: 2882" data-attributes="member: 82">That really sounds like a blocked filter.Can you see where your charge port is on your pump? there is usually a pressure switch there. Get some clear tubing, remove the pressure switch and attach a vavle with the clear tubing on the other end. Run this tube back to your tank. Run the machine and when it starts doing this again, block the machine and open the vavle, move the levers around a bit and see if there are any bubbles. If there are, there is a restriction causing the oil to foam. My 731 did this to me, i striped it for painting and re-assembled it and it refused to drive properly. I just couldn't get the air out, i then cleaned the bronze filter AGAIN and it worked just fine, all the bubbles went away.My 731 did this when i bought it too, it would work fine for 10-15 mins then it would howl and refused to move. Cleaned the filter and it was great. The only other thing it could be is your oil, it may be too thin? when it heats up its just too thin and causes it to cavetate?You could always harass your local bobcat dealer and pick their brains on what the cause could be.Let us know how you go.</blockquote>