Genuine Replacement Seal Kits and Replacement Parts

       “Prince Manufacturing knows that you trust our products, processes and materials. 

       For this reason….. Do you risk the integrity, operations and potential safety of your equipment by NOT choosing to repair and/or refurbish Prince cylinders with genuine replacement parts from Prince?

       You are smart people…. You know you can’t tell by looking what kind of materials the major components of your cylinder are made from or the dimensions and tolerances for that matter.  The same goes for the seals that keep the oil where it belongs.   Prince Engineers make selections for the materials and geometry based upon your valued input for the form, fit and function of the products we made for you.

       After market replacement components made or supplied by someone else opens the door to unintended consequences….. ones that you may not have even considered.

       Trust Prince for your genuine replacement parts…..

              We designed them….

                     We manufactured them…

                           We stand behind them.  “

Please visit http://www.princehyd.com/Catalog/Parts-Manuals for our product part lists.

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. 

Prince Online Services - Shipment Tracking

Slow Loader - Spool Valve Problem

I received the following the other day: I purchased a two-spool control valve RD522GCGASA4B1 on 4/27/11 from xxxxxxxxx.  The unit is mounted on a '65 Ford 3400 with front end loader.  For the last 3 or 4 months the lift cylinders have been going up real slow at 1200 rpm.  If I increase the rpm's to 1800 it goes up a bit faster, but not much.  The lift cylinders are connected to the spool valve next to the relief valve.  The bucket cylinders snap bank and forth real fast with or without a load.  The normal load on the unit is a 900-1000 lb round hay ball.  

The other thing I noticed is that the spool valve for the lift cylinders will go to the bottom and hit a hard spot, then when forced with the handle will continue down and unload the lift cylinders allowing it to fall fast.  Is this normal?

I contacted your distributor they referred me to xxxxxxxx at your plant.

My questions are:  1 - What would cause this problem?   2 - If it is the spool valve can I fix it with new parts?  

These are typically easy issues to get thru depending on how much folks know about their system, sometimes they can get tricky.  The following are my comments:

The RD522GCGA5A4B1 doesn't change the flow rate or generate pressure (it does have a pressure relief cartridge at the inlet).  This valve takes the inlet flow and directs it to either the outlet, or one of the 4 work ports.  In the float position the inlet and work ports are connected to tank.  (http://www.princehyd.com/Products/Hydraulic-Valves/Mono-Block/25-Gallon-Three-Spool will provide details on this valve is a flow directing control valve.)

Cylinder speed or movement speed is determined by the amount of flow that is available.  With a gear style pump, increasing the pump speed or RPM’s will increase the flow rate or cause the cylinders to move faster.  The cylinder bore is another item that can affect cylinder speed.  A large bore cylinder (lets say 6 inch bore) being filled with 10 gpm’s will extend slower than a small bore cylinder (2 inch bore).  This has to do with area.  The 6 inch bore cylinder has more area to fill and is going to fill up slower than the smaller 2 inch bore cylinder.

You mention that shifting the handle in a certain position will cause the loader to fall fast.  This is likely the float option and based on your description, it is working fine.

Here is some information on trouble shooting a hydraulic system.  

Loader Valve Trouble Shooting maybe helpful also. 

Parts Manual for the RD5200 Valve.

With a pressure gauge these types of problems are usually easy to resolve.