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I have a Zetor 6441, we had a guy out to cut down 2 large dead oaks. He used the tractor to move large branches to a burn pile. We had to add some hydraulic fluid to it after a few hours. Now it starts and runs it will move forward then just stops ( engine still running). Anyone experienced this?
I would check the clutch first and then the power shift. It is possible that the load clutch is leaking and cannot build up enough pressure or that the plates are worn.
But I would need more details about your machine (year and month, model name, features).