I have the hydraulic motor disassembled from my recently acquired chipper because the shaft seal is leaking. Whether the P.O. of this unit shut it down suddenly or if it was used without the case drain line hooked up, I'm not sure. While examining the motor, I was thinking that if the supply and return lines were tied together in front of the motor through a valve, that that could provide a way to safely shut the motor down at speed. It might also give a soft start ability, too. This wouldn't help in an emergency situation, of course.
I think your check valve concept has merit, but I've no real experience to base that on.
I am wondering if the case drain is up to the task of accepting the full flow of oil at full operating speed without excessive pressure on the seal? My tractor is an early 3018PS. According to the hydraulic diagrams, the case drain appears to be plumbed into the return line of the power steering. Later models appear to have the case drain line plumbed into the return line after the oil filter, just in front of the oil tank. I've not actually checked my tractor to see how my drain is hooked up, having just looked at the diagram just this morning. I've seen older posts alluding to the case drain return line connection point as being critical, but I never gave the matter much thought until now.
Paul
I think your check valve concept has merit, but I've no real experience to base that on.
I am wondering if the case drain is up to the task of accepting the full flow of oil at full operating speed without excessive pressure on the seal? My tractor is an early 3018PS. According to the hydraulic diagrams, the case drain appears to be plumbed into the return line of the power steering. Later models appear to have the case drain line plumbed into the return line after the oil filter, just in front of the oil tank. I've not actually checked my tractor to see how my drain is hooked up, having just looked at the diagram just this morning. I've seen older posts alluding to the case drain return line connection point as being critical, but I never gave the matter much thought until now.
Paul