Increasing hydraulic pressure

[Anonymous-0]

I put a double spool valve off a case 1840 skid loader on my log splitter and I want to increase the pressure going through the control valve (spool valve). Does any body know what springs to turn, shim out/in. I only use one side of the valve to move the splitter cylinder in and out and I just put on a 16 GMP pump, it gets to the log quicker and returns home but it just dont have the power to split big logs. It doesnt bog the engine down. (12 HP briggs). My buddy said you can shim/adjust springs in them to push the pressure to the cylinder and not back to the tank. Any Ideas?

 

[TripleRange]

Sounds like your engine could handle an adjustment to the relief valve, turn tighter. Spool valves shouldnt have anything to do with pressure...unless they have built in relief valves that are opening up to soon and dumping the flow back to the tank.

 

[Anonymous-0]

It probably does not have the push. Now how about a little help from you. What brand of valve is this? If nothing else do you have cating numbers. Next thing, how fast do you run the engine to get 12 H. P.? Remember the old rule of thumb: It takes one horse power for each one gallon of flow (GPM) @ 1500 PSI. How large (bore size) is your splitter cylinder.

 

[Anonymous-0]

I dont know if my spool valve has a relief valve. It has a couple covers opposite end of the handles and one cover is spring loaded when I start to remove the screws. on each end of the spool valve it has a allen screw in the center of a piston that screws in to the valve body with holes all around the center that sticks into the body.

 

[Anonymous-0]

Cant find any numbers on it. I just replaced the pump on my engine from a 11 GPM to a new 16 GPM and I was hoping to get alittle more power out of the splitter. I usually run the motor about half throttle and when I get in to a knot or stringy wood it just stops and I have to beat the chunk off my wedge. It has acouple adjusting screws opposite ends of the levers. I am only using one side. Hope this helps.

 

[Midwest redneck]

It is the relief valve that will set the maximum system pressure.
There should be an adjustment screw on a valve

 

[Walt Davies]

You need to install a pressure gage then adjust the relief valve on the controls. don't do it without the gage as even a small 1/4 turn of the valve can jump from 2000 to 5000 PSI. Check to see what the max is for your pump or you may blow it right up in your face.
Walt

 

[Anonymous-0]

My brother had a loader tractor that would lift anything that you could keep the back tires on the ground but the remote for impliments wouldn't lift much. They were plumbed in series. Replaced the spool valve and now it lifts a lot. It must have been bypassing internaly.

 

[bradley martin]

Increasing gallons/minute will have no effect on how much pressure your splitter will exert....only in how fast it will cycle. You must either increase pressure or put on a larger bore cylinder.

 

[Anonymous-0]

Most likely your valve is manufactured by one of these 3 companies: Cross, Prince or Gresen. They all have a relief valve available. The relief valve is located between the inlet port and the first spool.

 

[Anonymous-0]

do you have a oil filter on your hydralic sustem? that would definetly give you low pressure if not i would assume your valve is bad letting to much oil bypass back to the tank i find it hard to believe a new 16gpm pump would not be set to the right pressure but its possible if i were you and everything else checks out i would take the pump off and have it checked at a hydralic shop because it could be very dangerous if you start adjusting the ptrssure relief setting on the pump even with a gauge i wouldnt mess around with it especialy being new they may not take it back if they knew you were adjusting it yourself. better safe than sorry.

 

[El Toro]

Why don't you buy a log splitter detent valve? It will automatically kick back to the neutral position after retracting the piston. That's what I did on this splitter and I bought the two stage pump. I had a problem getting it to down shift to the second stage. I found I needed to install 4 bolts thru the pump and then it had to be torqued evenly. Then it would then downshift. I never ran this 10hp Tecumseh engine above 1/3 throttle. The governor would open the throttle if it needed it. I think your hydraulic pressure is somehow bypassing. I had a filter on this too and it is shown in the picture. You need to install a 0 to 5000 psi calibrated gauge and see what your pressure is. It should be factory set. I wouldn't make any adjustments. You should get the maximum pressure when you run piston to the end of its travel and hold your control lever forward. This splitter has a 4-inch cylinder too. Hal

 

[Joe(TX)]

A 12 hp engine coupled with a 16gpm pump will only allow about 1250 psi. Putting on a higher flow pump will not give you more power, only more speed and less force. It's little wonder it won't split the log. You need to a 10gpm pump with that engine unless it is a 2 stage pump.

 

[TripleRange]

No...that cover and spring just keeps the spool in position and is adjustable to close the port all the way. J Schwiebert is probably right...it's probably on the inlet port somewhere...and it's built into the valve. The other guys are right too...if you raise the pressure relief you run the risk of stalling the engine. The spool could also be wore enough to be leaking internally but I doubt it.

 

[paul]

Your max power is governed by the engine on your splitter.

That power can be used in 2 ways - more speed, or more pressure.

If you want more splitting power, you will have to give up speed. Either a pump with less gal/minute but more top pressure, or a larger hyd cylinder which will move slower because it takes more oil to fill.

You went the wrong way - you got a pump that moves more oil. This will make the cyl move faster, but it will give you less force.

Messing with the pressure reliefs likely won't help you much, just stall the engine quicker. What you need is a pressure gauge, a bigger hyd cyl, or a slower gal/min pump that puts out more pressure (it's always a trade off, speed vs pressure....).

Look up the specs on all & don't exceed the max pressure of your weakest part.

--->Paul