Max. gpm through LT40 hydraulic valves?

Dave Shepard · March 29, 2014, 08:38:35 PM

Does anyone know the max gpm I can run through an LT40 Super hydraulic valve bank? I have a 10 HP electric power pack with a good size pump on it. I'm going to be hooking that up this spring or summer, and I would like to run it through the mill with power beyond to another valve bank for functions on the bed extension, plus a couple of other things I want to run near the mill. I suspect that there is going to be too much flow to do that, and may have to use a flow divider and just send equal parts to the mill and to the extension.

Peter Drouin · March 29, 2014, 08:43:10 PM

I don't know, but Bibbyman did that I think.

Dave Shepard · March 29, 2014, 08:47:29 PM

I believe his is a 7.5HP, but I don't know the gpm. ElectricAl has a power pack, and in his video, it was running about 500 psi back pressure, if I remember right. I can buy a flow divider, if I have to, but I think the good geared ones are pretty pricey. For right now, I'm going to steal my first roller toe board and put it on the first bed section on the extension and get a couple of 25' hoses. Later, I want to power the backstops on the BX and also build a timber turner that goes right about where the two beds bolt together.

Bibbyman · March 30, 2014, 07:18:47 AM

Wood-Mizer would be your best official source as they would know the specifics of the hydraulics on your mill. I urge you to call them.

If you go to the "mods" topic and read what I did, I think my pump was set up at 6gpm @ 2,000 psi.

My pump unit was built by a hydraulic shop that I provided schematics from the mill and counseling from Wood-Miser.

I need to add that 6gpm is often too fast. I end up feathering the valves. But I needed this speed to run the deck. I think ElectricAl went with 4.5 or 5 gpm.

ElectricAl · March 30, 2014, 07:30:08 PM

Dave,

We are at 5.5 GPM.

I would check the GPM rating of your pump. Anything over 6 is too much.

ElectricAl

Dave Shepard · March 30, 2014, 07:36:59 PM

Ok, thanks. I know it's more than 6gpm. It's got a 10 hp motor on it, and a pretty good sized pump. I'll have to see if I can get a geared flow divider and run a separate valve bank for the extension.