The magic 540 speed is reached at rated load speed of the engine. In other words if your tractor is set to run at the correct high idle speed of I believe 1815 on an H it will run 1650 at full rated load . Like others have said, pull throttle wide open and go. You may be able to throttle down some if you like as long as you do the job you intend. The way to tell if you are overloading it when running in a throttled down speed is to just pull back on the throttle and if it does not respond with a little more rpm's you are exceeding the power of the tractor. The reason I added this is because there is a great tendency to overload and engine when not running at full throttle especially if you do not have a tach to watch on the tractor.
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