LS-3000-1 Log Splitter Pressure Release Detent Question

     Question: On the LS-3000-1, what is the preset PSI and what is it adjustable to on the pressure release detent for the cylinder return?

     Answer: The LS-3000-1 pressure release detent is set to center the handle when the B port reaches a preset 1400 psi.  The inlet relief of the LS-3000-1 log splitter valve is preset at 2250psi @ 3 gpms and 105 degree F.  We recommend 250psi at a minimum between the inlet relief and pressure relief.  You would want your inlet to be 250psi higher than your pressure relief detent.

Below is the engineering spec section for for reference:

     Relief Valve Settings

          Unless otherwise noted with order code or on print, relief valve setting is to be 2250 psi* ± 100 psi @3 GPM ± 1 GPM.  All other settings to have similar ranges unless otherwise noted on assembly drawing or bill of material.

          *The Relief Pressure is defined as the pressure drop from the inlet of valve to the outlet of valve.  3 GPM must be flowing across the relief at 2250 psi.

     
     Detent release pressure to be 1400 psi ± 150 psi at 3 GPM as standard setting.  If the relief setting is less than 1650 psi, the detent release pressure is to be set at the relief setting at minimum minus 250 psi.

Be sure to check out our youtube videos also.

Please visit our LS-3000-1 Catalog pages.

Please visit our LS-3000-1 Parts Manual pages.

Please visit our LS-3000-1 Instruction Sheet pages.

Please visit our LS-3000-1 Availability.

Hydraulic Power Beyond

This is a really good video done by someone with
a Kubota Loader.  Very nice.  Below are some links to the RD5000 2 spool valve
that he is installing.

http://www.princehyd.com/Portals/0/valves/RD5000InstS.pdf

http://www.princehyd.com/Products/Product-Configurators/product/Valve/family/RD5200

http://www.princehyd.com/Portals/0/valves/RD5000Manual.pdf

http://www.princehyd.com/Portals/0/valves/ValvesRD5000.pdf

http://www.princehyd.com/Products/Hydraulic-Valves/Mono-Block/25-Gallon-Two-Spool

Regen Log Splitter - 20 GPM's?

The other day this question came in: Can I use the Prince LSR-3060-3 valve with a single stage 20 gpm pump?  The short answer is, No.

The longer answer is:

A regen circuit can be used to cause a cylinder to advance more rapidly than it could with pump oil flow only.  It can only be used to increase speed in the extension, not in the retract direction.

The basic idea of regen is to connect the rod end of a cylinder to its blind end or extend end, using suitable valving (see LVS, LVT and LVR Loader Valves and LSR Rapid Extend Log Splitter Valve), so the oil which normally would be returned to tank from the rod end will be combined with the pump oil.  This causes the cylinder to extend at an increased speed.  The hydraulic schematic on the bottom of the 2^nd page of this linked pdf shows the regen circuit with in the valve.

Some notes on Regen:

-       In regen, the force produced will be equal to that produced by the pump pressure based on the area of the rod.

-       Regn is usually used with cylinders that have large rods.

-       With larger rods, you need to be aware of pressure intensification.  Some applications require a relief valve on the retract port or rod end of the cylinder to handle the pressure intensification that can happen during extend.  Take for example the LSR-3060-3 Log SplitterValve.  It is going to provide extend flows up to 25 gpm with inlet flows of 4 gpm.  What would happen if you have an inlet flow of 20 gpm?  You would see extend flows attempt up to 120 gpm.  The work ports and hoses are the wrong size to handle 120 gpm.  You would see large pressure intensification.

-       Regen is typically used to get a machine or part of a machine (loader bucket tip, log splitter cylinder) into position or the force needed to perform the work is small.

-       Caution should be exercised when sizing the oil reservoir.  A cylinder with a larger rod will cause the oil in the reservoir to fluctuate more than normal.

So why does a regen circuit work?

            In a regen circuit the same amount of pressure is applied to both sides of the piston in the cylinder.  Working similar to a displacement style cylinder, the larger area (extend side) will cause the cylinder to move – extend.  The retract side or rod side doesn’t have as much area because the rod is taking up space – Force = PSI X sq inch area of rod.

I hope this is useful information for you. 

Poor Gear Pump Flow

Please take the time to check out the hydraulic pumps listed at this Link . You will find some useful information.
Common Causes of Hydraulic Pump Failure
Q: What are the most common things apart from pressure or speed that can cause a pump to fail?
A: The most common things that cause a pump to fail fall into three categories; Cavitation, Contamination, and Heat.

• Cavitation: This is caused by a lack of oil flowing into the inlet port. It will damage the pump, and reduce flow. If you see foamy oil, it is a good indication of cavitation. Increasing the size of the inlet line or reducing flow can help with cavitation problems. Removing any elbows, bends, or filters on the inlet line can also help. Lastly, making sure that the oil reservoir is above the pump may also be beneficial.
• Contamination: Contamination will not only cause damage to the pump, but may also plug valves, reliefs, etc. in the system. It is important to have the proper filtration in the system, including changing filters regularly.
• Heat: Any Hydraulic system will generate heat. It is important to deal with that heat so that the oil temperature does not rise high enough to cause damage to seals, valves, etc. Having a properly sized oil reservoir (or oil cooler if necessary) is important in order to avoid excessive heat buildup in the system.

Lastly, make sure to refer to your manual for the proper pressure/speed limits. Exceeding those limits will damage a pump, and cause it to fail prematurely.