hydraulic problems

[triangel]

I am building a wood processor and I set up the hydraulics with bad results, I purchased all the components from princess auto, 8hp two stage pump driven by a 18 hp motor at 1800 rpm. I have run it through a MD30 triple valve. the pump puts out 16 gpm at low pressure and 4 at high, the valve is rated for 25 gpm,3000 psi max set at 2000 psi from factory.I purchased also a power beyond valve kit for this valve because I hooked up a single valve 30 gpm rated at 3225 psi with kick off for my splitter. the way I have it hooked up pressure from pump to triple valve,first valve is hooked to an orbit motor to drive my log mover,second valve to a 1.5 inch cylinder for my log clamp, third valve is hooked to a 3" and 2" cylinder for my saw and log stop, the fourth valve is for my log splitter with the kick off on return. the line from there goes back to the filter and reservoir. all valves have build in pressure relief valves. fired it up and went to move a cylinder on second valve the piston came out and would not go back, tried the other piston same result, moved the orbit motor and it burst, shut it down all valve were fully pressured on both sides. No Idea what went wrong, Princess auto hyd tec told me this was correct, I think but do not know for certain that the power beyond valve is the problem. any answers would help as this scared the crap out of me

 

[LD1]

Sounds like something is amiss on the return. I am having a hard time visualizing the setup. Pictures I think would help.

 

[triangel]

some pics the second picture shows the port from the first valve body to the second valve body . originally the return is where the plug is and where it is connected is the changeup to power beyond that I was told I needed to hook up the second valve. also in the second pic I do not have one hose hooked up to the splitter piston yet in case you are wondering why just did not have it done when the pic was taken.

 

[J_J]

Should not run a hyd motor off the same valve as cyl.

The spools may share flow and mess things up or one spool may have priority and take all flow for that spool hyd. .

You need an open center valve with PB for the cyl.

Did you install the PB or the closed center plug.

Do you have a dedicated tank line?

Show the side of the valve with PB, and label all ports.

You need a splitter with the GPM requirements that the motor needs.

For open center valves, the flow is provided by a gear p ump that pumps fluid all the time and that fluid has to flow from pu mp to tank at all times.

Your PB adapter will look like one of these.

Last picture is a CC plug.

Did you install a hose in the PB port?

I am thinking your valve burst because you plumbed it wrong.

Air in the IN port will help you plumb it correctly.

Just ask the questions you need answered and someone can help.

 

[triangel]

some pics of drives

 

[triangel]

the orbit motor is on its own valve, each cyl is on its own valve, I should clarify when I said valve I should have valve body as the first valve body has three valves and the fourth is added on.

 

[J_J]

some pics of drivesView attachment 422316View attachment 422318View attachment 422320

Are those tee fittings in a return line or tank line?

I see water pipe fittings all over your system, and on pressure lines.

I would not recommend water pipe fittings, should get hyd fittings. Tank line might be OK.

 

[triangel]

the tee fittings are on the saw control cyl. the tee goes to a second cyl which is the log stop. these two cylinders are on the last valve of the three valve body

 

[J_J]

some picsView attachment 422314View attachment 422315 the second picture shows the port from the first valve body to the second valve body . originally the return is where the plug is and where it is connected is the changeup to power beyond that I was told I needed to hook up the second valve. also in the second pic I do not have one hose hooked up to the splitter piston yet in case you are wondering why just did not have it done when the pic was taken.

In one picture, you have the tank line plugged.

Using PB, tank line must go to tank.

I am not surprised that you busted the motor. Whenever you use the first valve, you also take away fluid from the second valve.

Do you need the motor spool locked on or temporary on/off?

 

[J_J]

the tee fittings are on the saw control cyl. the tee goes to a second cyl which is the log stop. these two cylinders are on the last valve of the three valve body

Did you want the cyl to operates together or in sequence?

Either way, should not have water pipe fittings in the cyl if your hyd pressure is up around 2500 to 3000 psi.

 

[triangel]

Looking at your picture of the pb the two on the left are what I purchased with the valve from the store rep. He told me where they were placed . I plugged the original port with the plug he sold me, and removed the plug from the pb port and inserted the pb valve you show above the bottom plug. I did not have a plug with the hex that you show on the right

 

[J_J]

some picsView attachment 422314View attachment 422315 the second picture shows the port from the first valve body to the second valve body . originally the return is where the plug is and where it is connected is the changeup to power beyond that I was told I needed to hook up the second valve. also in the second pic I do not have one hose hooked up to the splitter piston yet in case you are wondering why just did not have it done when the pic was taken.

Where is the tank line going on the one spool valve?

If going to tank, then OK, but is going to another valve, you need PB.

 

[triangel]

The tank line from the single valve body is going to the tank

 

[triangel]

I want these two cylinders to work together, when the saw goes out the log stop cyl come out to stop log, when I pull the saw in to cut wood the stop cyl retracts to allow clearance for the log to fall.

 

[J_J]

The tank line from the single valve body is going to the tank

Where is the tank line from the three spool valve going?

 

[triangel]

that would be the power beyond line which goes into the single valve

 

[J_J]

No, that is the PB line, where is the tank line going.

I see a plug in what I think is tank port.

Each valve should have a tank port.

 

[J_J]

No, that is the PB line, where is the tank line going.

I see a plug in what I the I think is tank port.

Each valve should have a tank port.

 

[triangel]

The princess auto hyd rep told me to plug that port ,this originally was the tank port, he sold me the plug and the adapter for the pb port and told me to do this, you may be right I will question him on Monday

 

[J_J]

It is written in stone, that if you use the PB port, you must run a tank hose to tank.

You see, the PB adapter is there to separate the valves galleries into tank gallery and a PB gallery.

So when you use a cyl, the cyl expended fluid has somewhere to go. Right now, you have the tank port plugged. Unplug it and add a hose and run it to tank.

When you first get an open center valve, the outer PB port is usually plugged.

What happens is that the pump flow and cyl flow dumps into the tank port, and everything is well.

I would make them swallow the cost of motor replacement if you can prove he told you to plug the tank port.