Posted by Jeff-oh on October 02, 2008 at 15:38:30 from (192.88.212.44):
In Reply to: Re: Flipping Fordson posted by RodInNS on October 02, 2008 at 14:09:02:
You are partially correct. However, you are mixing modes of operation, between operation under regular loading and that of an ultimate load.
When an implement is mounted on the tractor there is a conflict of operation of the lift if the implement strikes an obstruction such as a root or a rock, the increased draft on the implement puts the hydraulic pump into operation tending to raise the implement out of the ground. The tendency then is for the implement to be raised out of the ground altogether but it may be so caught underneath a ledge of rock or under a root that it cannot raise. Great pressure will therefore be put on the rear wheels of the tractor which will tend to give them increased traction and lift the front wheels of the tractor off the ground. Thus either the implement or the connection may be broken or the front of the tractor will be raise off the ground and turn over backwards, possible causing a fatal accident.
To overcome this problem the Ferguson system reacts to an excess of draft on the implement due to striking an obstruction, the pump will automaticly be put out of operation. For example in the case of controlling an implement hydraulicly the excess of movement in the pump valve caused by striking the obstruction will move the valve so far that the release ports will be uncovered and allow the fluid to escape, thus automaticly releasing the lifting pressure. The safety valve (you described) is put on the delevery side of the pump. This safety valve may provide the two-fold purpose of acting as a safety valve in the ordinary way to prevent excessive pressures (as you describe) and it is also connected to the implement control mechanism so that under excessive draft such as is caused when striking an obstruction the safety valve will be opened and the pressure released, whereupon the weight on the rear wheels of the tractor will be automaticly reduced. This reduces the tractive effort and the wheels spin or slip on the ground, thus avoidingdamage to the implement or connections or danger to the operator through the tractor turning over rearwardly.
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