hyd problems

Redfarmdogs · Jul 21, 2011

Hi Have a hydraulic problem that has me steaming. Building a log splitter. Using what has been laying around and donated. Engine is a 24hp briggs & stratton. The hydralic pump is a commercial intertech, 312-9310-770. I know nothing about this pump, just that is new. has a 1in inlet a 1 outlet.I have a diverter valve in place 16gpm from princess auto. This is where the ram came from also. My problem is when i try to return the ram to the bottom of the cylinder. the engine goes under a severe load and stalls. When i change the hoses around the unit labours on the other side of the stroke. The control valve is new. Using a 2 spool valve because i want to add a log lifting system to this nightmare.Thanks for any and all help. Dave

J_J · Jul 21, 2011

Why are you using a diverter valve. Are you not going from pump to log splitter valve back to a filter and tank?

Do you have any idea of the GPM's and the psi on the pump. It could be flow and pressure tested if you really want to know.

What size is the log splitter valve, and is it a log splitter valve?

The pump may be putting out more GPM than the valve can utilize. Try running the motor at 1/4 speed.

Redfarmdogs · Jul 21, 2011

hi JJ Thanhs for the reply. Is their a place on the enternet that you can find information on that pump. Dave

J_J · Jul 21, 2011

Redfarmdogs said:
hi JJ Thanhs for the reply. Is their a place on the enternet that you can find information on that pump. Dave

Here is some data for Intertec pumps, but I didn't see your numbers. It might be discontinued.

Commercial Intertech General Listing for Pumps and Motors

You can fill the pump with fluid, and turn the shaft 360 degrees, and measure the fluid ejected. That will be the displacement.

Redfarmdogs · Jul 21, 2011

the pump would have to be how old not to show up in the stats. It seems that when i move the control valve to activate the ram it goes into hyd lock.

J_J · Jul 21, 2011

Do you know for sure that you have flow out of the work ports. Remove the hose off the cyl, and place in a clean bucket and start the engine, and push the lever momentary, and pull the lever back momentary. Is there fluid flow out of both hoses?

Is the output of the pump connected to the IN port of the log splitter valve?

Have you seen the cyl shaft complete a full stroke.

Redfarmdogs · Jul 21, 2011

Hi JJ I would have to say no not wiyhout having to take a line off

Leejohn · Jul 21, 2011

Are you hooked to A and B ports or to two A's or two B's. Has to be A and B on one spool other spool plugged.

DJNebraska · Jul 21, 2011

Where do you have your diverter valve plumbed in?

It needs to be plumbed in after the pump but before the directional valve. If it's not, and you have it plumbed in off of one of the directional valve work ports, it will not allow much if any oil to flow backwards through it. There are models of diverter valves that do have integral check valves to allow for this, but most places that sell those valves do not stock them that way. Share the model number.

Also, make sure you have a system relief too, plumbed in before the diverter valve (some diverter valve models have an relief built in, but the excess flow will have to be taken to tank and not another hydraulic function).

As far as the pump goes look at this link...Hydraulicstore.com - 877.778.3533 -

These are Permco pumps, but fully interchangeable with Commercial pumps. You can measure the middle section of the pump and subtract 0.75" and that's going to be the gear width. This style of pump will have 2 cubic inches per revolution per inch of gear.

Maybe you could take picture and upload and I'm sure we'll give our other 1 cent.

Redfarmdogs · Jul 21, 2011

From the pump to the deverter valve where it branches off one to the resevoir and the other to the control valve , off the control valve one the one spool i have 2 hoses coming off both going to the cylinder. the other spool vavle is blanked off as this was going to be the first step in building this project. At the end of the conrol valve it returns to the reservoir. Thanks Dave

Redfarmdogs · Jul 21, 2011

Hi I have the deverter valve located at the end of the hose that comes from the pump this is where it is returned to the reservoir or can go to the control valve . thanks for your help

J_J · Jul 21, 2011

Do you have the hoses in ports A1 and B1, or A1, and A2? Can you show a pic of the work ports?

Tell me again , why a diverter valve?

A diverter valve or priority valve is not necessary on a log splitter. If you want to use a two lever valve, they make one just for something like a log lift.

Do you have the unused ports plugged?

Redfarmdogs · Jul 21, 2011

Ports are A1 & A2 ports B1 & B2 are plugged. Was told by a hydraulic company owner that donated the pump & valve to me that a flow control valve was needed. Also after some calculations at princess auto said yes the valve was needed.16gpm valve, princess auto #8154593 Thank you for your help

J_J · Jul 21, 2011

Ok, here is the valve.

Princess Auto

Now here is the question. Does someone know how many GPM's the pump is pumping, and if so, why reduce the flow. . There is no reason to limit the flow from a log splitter situation, unless the control valve is smaller than the pump flow, or you want to slow down the cyl speed. If the flow control valve is capable of 16 GPM's, then you have the option of dialing in the GPM's you desire. You could have reduced the engine rpm to achieve the same results, less GPM's.

I don't know of any log splitter that has a flow control in the circuit.

Do you know the GPM rating of the log splitter valve?

Your 24 HP engine can power a single stage hyd pump of 11.5 GPM at 3000 psi. If that pump is a 16 GPM pump, you do not have enough HP to power it.

If the engines tries to stall, that means that the fluid is being blocked or the force required is too great. If the pressure builds to the relief pressure, then the valve will relieve.

So, in my opinion, you do not need the flow control.

Try the hoses in A1, B1. A/B should be on the same spool for cyl to function.

A2 and B2 should be on the next spool over.

Redfarmdogs · Jul 21, 2011

Hi JJ I believe that the gpm is 17.0 maybe as high as 20.5.. Consider the engine runs idle 1200 1750 operating speed,

J_J · Jul 21, 2011

Your engine 24 HP Briggs should be able to run at 3600 rpm.

Your engine will start stalling at 11.5 GPM, and 3000 psi.

Is your engine to pump a direct drive?

Redfarmdogs · Jul 21, 2011

don't have my manual at hand but i believe that was governed speed settings. Yes on the direct drive. Won't the flow control valve after setting take care of the stalling problem? It is the valve at princess auto. Dave

J_J · Jul 21, 2011

The excess flow out of the flow control valve, is it teed into the return hose from the log splitter valve before it goes through the filter, and then to reservoir?

Redfarmdogs · Jul 21, 2011

hosed into a return manifold????????????? By-passing the return filter. Good point It will be

J_J · Jul 21, 2011

I am not sure you understand, but the return hose from the log splitter valve and the excess flow hose should be teed together and fed to the return filter and then to reservoir.