Rear Remote Valve Type

[maximus188]

I will start by saying I know very little about hydraulics.

I have a Skidril HP18 post driver (link at bottom) for fence work. It's currently ran off a Kubota M4900. I can run the outgoing hydraulic line off the top remote but the return line has to go back to the reservoir instead of the return outlet. If I hook it up to the return, the driver will hit one time and stop. I'm looking at getting a new tractor and am wondering if there's a type of valve that will work without having to send the return to the reservoir? Kubota's website says I can get a Detent Valve (Non-Self-Cancelling) or a Float Detent Valve. The M4900 doesn't have a loader but the new tractor will. I'm looking at a B2650. If the return on the rear remote won't work, what would be the easiest way to send the flow back in? I've looked at Skidril's hydraulic power packs but the cost is way more than I'm willing to spend. Any help is appreciated.



Hydraulic Post Driver, Post Pounder, T Post Driver, Stake Driver, Air Driven Post Driver, Air Post Driver, Ryno, Rino

 

[Jim Timber]

Just add a "T" to the tank return line from the SCV if that's possible, and add a QC connector to hook to the post pounder.

 

[BeezFun]

I can run the outgoing hydraulic line off the top remote but the return line has to go back to the reservoir instead of the return outlet. If I hook it up to the return, the driver will hit one time and stop. I'm looking at getting a new tractor and am wondering if there's a type of valve that will work without having to send the return to the reservoir? Kubota's website says I can get a Detent Valve (Non-Self-Cancelling) or a Float Detent Valve. The M4900 doesn't have a loader but the new tractor will. I'm looking at a B2650. If the return on the rear remote won't work, what would be the easiest way to send the flow back in? I've looked at Skidril's hydraulic power packs but the cost is way more than I'm willing to spend. Any help is appreciated.

On a B2650 I'm pretty sure the hydraulic oil fill port is on the top of the transmission at the back of the tractor like on my B2710. That makes it easy to connect to, but unfortunately it's not threaded so you need an adapter. I bought a fitting with an O-ring that I push into that filler opening and connect the hydraulic return line to that from my pounder. Since it's not threaded, you have to tie wrap it in place, a little kludgy but really cheap and easy. The other option is to do what the other poster suggested, T into the return line on the remote valve assembly. That's a cleaner solution but will require modifying the existing hose and buying some fittings, so it could cost you $100 or so to get all that done at a shop. Just make sure the fittings and hoses are as big or bigger than the ones coming off the pounder so it doesn't restrict the flow.
As far as what valve to buy, a valve with a float detent is not what you want for the pounder, but it is what you want for something like a bush hog where you want to lower it, and then let the top link cylinder float up and down freely. For the pounder you want a detent valve so you can put it into position and have it stay there so it continuously supplies oil to the pounder. You should check the oil flow on a B2650 and make sure it's adequate for the pounder. It's nice to have 3 remote valves, one float detent, one position detent, and one spring return. That pretty much covers anything you'll need to do.

 

[kennyd]

I don’t think the QD/Tee on the return line is a great option here, the fluid needs fast and unrestricted way to the tank for the pounder to work properly. Making an adapter for the fill port is best, just get an extra cap from Kubota and modify it to hold the hose.

 

[BeezFun]

Does anyone understand how this post driver works? My post pounder uses a hydraulic cylinder to raise a large mass and stretch 2 big springs, then the cylinder dumps all it's fluid when the mass comes crashing down. But this driver is hand held and doesn't weight that much. The supply and return lines are the same size, so it doesn't seem as dependent on dumping fluid from the cylinder quickly. I watched the video and it hops up and down like a pogo stick, so what kind of hydraulic action is happening? Is there some kind of high velocity hydraulic piston that gets fired against the head of the post?