Deadheading motor with loader regeneration circuit

[nutfarm]

The Kubota L6060 Operators Manual says the following about the use of the loader valve:

"Do not connect attachments through the hydraulic motor to the [C] and [D] ports. If the control lever is moved to the Regeneration position (R1), the seals on the hydraulic motor will be damaged."

Since I want to use a diverter on the [C] and [D] ports (curl, dump) to run my grapple and I can see a loader arm mounted earth auger in my future, the above warning caught my eye. Also, it is important to note that the loader valve in question connected to the [C] and [D] ports passes through the regeneration position to get to the "normal" dump position of the valve. It seems to me that the if there were to be harm caused to a connected motor it could occur even if you don't linger in the regeneration position.

I have looked on this website and others for any reports of damage to a motor caused by pressurizing both ports simultaneously as would happen on a regeneration circuit and I have found zilch.

My questions boil down to these:

1) Has anyone experienced any attachment hydraulic motor damage with any tractor by subjecting it momentarily or longer to a regeneration circuit?

2) If you have any experience with different types of hydraulic motors, do you see merit to the Kubota warning above or not? Sometimes the warning verbage in these types of manuals comes from the company lawyers and not the company engineers. I am wondering if this might be the case here.

Thank you for your consideration and let me say that this site has been a real blessing to me in addressing my newbie concerns.

 

[bigdeano]

The shaft seal on a motor could certainly be damaged in that way. Get a motor with a case drain port and hook it to a tank line. It prevents damage to the seal if back pressure gets too high, like if motors are hooked in series, or your situation.

 

[nutfarm]

The shaft seal on a motor could certainly be damaged in that way. Get a motor with a case drain port and hook it to a tank line. It prevents damage to the seal if back pressure gets too high, like if motors are hooked in series, or your situation.[/QUOTE

Thank you. Your recommendation is spot on. So this begs the question: Are there smaller augers out there (pump output of 9.4 gpm on the tractor) that offer a port for a case drain? I looked at Mcmillen Belltec, and Danuser and there are no drains on their smaller units. I have also found that the auger motors advertised as working with flows of 10 gpm and up are terribly slow at a flow of 10 gpm. They will dig holes ok but they are too slow to self clear the flutes when pulled up. I need something sold for the 6 gpm and up range. This gets me to 60 rpm or so at my 9.4 gpm pump output.

Any information would be appreciated.