Hydraulic cylinder sizing ??

[hr3]

I'm trying to make my wife's log splitter easier to use.. Right now I'm putting new tables on both sides and would like to add a lift table and stabilizer leg to offset the weight on the lift side,, Stroke collapsed is about 18" on both.. I'm wondering what diameter I should go with,, The splitter is a 21 ton "White Outdoor" 6.5 hp motor..

Also what would you use for valves "on the cheep" to control them ??? Any help would be appreciated ..

 

[J_J]

I'm trying to make my wife's log splitter easier to use.. Right now I'm putting new tables on both sides and would like to add a lift table and stabilizer leg to offset the weight on the lift side,, Stroke collapsed is about 18" on both.. I'm wondering what diameter I should go with,, The splitter is a 21 ton "White Outdoor" 6.5 hp motor..

Also what would you use for valves "on the cheep" to control them ??? Any help would be appreciated ..

You need a valve with PB as the first valve in the flow path.

Here is a 2 spool valve with PB that would work well as a log lift and perhaps a blade lift.

Surplus Center - 2 SPOOL 8 GPM PRINCE MB21BB5C1 DA VALVE

You would have the pump feed the valve with PB, and the PB valve with PB adapter installed, feed the log splitter valve.

This valve can replace your current log splitter valve.

Surplus Center - 2 SPOOL 25 GPM PRINCE LOG SPLITTER/LIFTER VALVE

This valve can operate as a log splitter valve and as a log lift valve in one one valve. It also has PB for whatever you want to add.

 

[hr3]

Thanks' JJ But what do you think about the size for the cylinder for the lift and the stabilizer leg ???

 

[J_J]

2 to 3 in cyl bore for both.

 

[hr3]

The first valve you list would go before the existing splitter valve ?? If so is the 8 gal. per min. going to be enough to feed the splitter valve ??.. Or doesn't it work that way...

 

[hr3]

Would these work for the cylinders ??? https://www.surpluscenter.com/item.asp?item=9-7940-16-S&catname=hydraulic

 

[J_J]

if your tractor is a Kubota B7610 hst

\Hydraulics:
Type: open center
Valves: 1
Pump flow: 4.4 gpm [16.7 lpm]
Total flow: 7 gpm [26.5 lpm]
Steering flow: 2.6 gpm [9.8 lpm]

The two spool valve with PB mounted first should work, as your tractor only puts out an implement flow of 4.4 GPM

Your log splitter valve is capable of using about 25 to 30 GPM's.

That cyl should work fine if the open and closed length are good for you.

 

[hr3]

This isn't for my tractor,, It's for my wife's log splitter,, Like it says above it's a "White Outdoor " 6.5 HP.. This has nothing to do with my tractor...????????

 

[J_J]

Ok, now I understand, I missed the 6.5 engine.

What is the GPM rating on the pump on the 6.5 engine?

If it is higher than the 8 GPM valve, then look and find a valve with PB that will handle the flow of the pump. Install it first in line and make sure the filter can handle the hyd flow.

Maybe this one.

http://www.surpluscenter.com/item.asp?item=9-7976&catname=hydraulic

 

[Farmerford]

I would use a 2" cylinder; that's about 3sq in of piston face area, so a 2500 psi system produces a force of 7,500 pounds to extend the cylinder. I don't know exactly how you plan to mount it, so I don't know the shortest moment arm through which it will be acting. But if the cylinder can extend a full 16 inches surely the moment arm will not be less than 6", so even if your table extends 36" out from the splitter beam, and the log is at the very end of the table (unlikely) you will still have a lifting force of 1/6 of 7,500 pounds when the table is up to horizontal, which is 1,250 pounds. Take off 100 pounds for the table, that still leaves 1,150 pounds for the log. If your wife can get a 1,150 pound log to the splitter she doesn't need a lift table; in fact, she doesn't even need a splitter.

 

[hr3]

Ok here is the cylinder I have found,, What do you think,,,, I'm going to look for a valve to run 2 of them next... ITR-2014 - Tie-Rod Cylinder - 2" X 14" by International Hydraulics

 

[hr3]

I'll be going with the valve that JJ recommended in his last post.. Now I also have to order the Power Beyond adapter ?? Right?? and I don't want the 2 cylinders I am adding to go too fast so do I need 2 flow controller's ???

 

[J_J]

Install the valve with PB first.

Yes, you will need the PB adapter.

Your pump volume and lever management will dictate how much fluid is going to the cyl's.

If they are still to fast, then install a needle valve in the cyl line that you want to slow down.

Small cyl hoses will slow the volume somewhat.

 

[J_J]

A 2 in cyl with a 16 in stroke will be very fast with a 13 GPM pump.

Like bam. it throws the log at you.

A 3 in cyl will be half as fast.

 

[yomax4]

With JJ's help, I also built a lift arm for my splitter. I used a 3.5" x 8" cyll. It performed perfectly. Not too fast not too slow. Today it lifted a stump that I could barely roll on to it. No problem. Didn't need an extra leg to off set the weight. it works awesome. My back feels great and I no longer have to toill away using my loader to lift heavy logs. Wish I would have done it 20 years ago.

 

[hr3]

Still waiting for my stuff to show up.. Today I worked on the stabilizer leg for the splitter and came up with a simple cantilever ratchet latch so I don't think I'll need the second cylinder for the table lift I'm adding.. I was wondering if the valve I ordered can be used for the splitter valve and lift table valve ?? I'll save the valve that is on it now for another project,, Surplus Center - 2 SPOOL 14 GPM PRINCE WVS21BB5C1 DA VALVE

 

[J_J]

Yes, you can use that valve as a log splitter valve. Except

It is a spring centered, when you let go the lever, it springs back to center.

You will have to hold the lever for extend and retract.

Might get a little tedious, when you could be getting the next log ready.

 

[hr3]

Is this what I need to hold the lever so it will return by its self ??? Surplus Center - DETENT KIT PRINCE 14 GPM MONOBLOCK VALVE

 

[J_J]

No.

Detent means that the lever will stay in a certain position, and fluid will continue to flow, or in a detent float position, the fluid is allowed to move in relation to the ground contour.

Detent could be a couple of balls in a groove holding the spool in position, pressure detent, or friction detent.

A log splitter valve has a detent in retract. You push the lever to retract, and the lever stays in detent until a certain pressure is reached, and then the lever returns to neutral.

Some valves could also have three position detent, where the lever can lock in three position.

The kit you show is for a spring center valve to convert it for a three position detent operation.

The three position detent will lock the lever in any of the three position.

If the pump is pumping, a detent lever will allow the fluid to flow through a work port to a motor. You would not want to detent a cyl, as when tthe cyl is fully extended or retracted, the relief would activate.

What is your intended use of a detent valve?

The below data is just some of the features that can be added to some valves.

Pressure Release Detent
1 Position Detent, Spool "out" Only,
Spring Center to Neutral
F**
Pressure Release Detent
2 Position Detent, Spool "in"
and "out", Spring Center
to Neutral
Spool "C" or "E" Only
G**
4 Position, Spring Center to
Neutral, Detent Spool In for
Float Position

 

[hr3]

No.

Detent means that the lever will stay in a certain position, and fluid will continue to flow, or in a detent float position, the fluid is allowed to move in relation to the ground contour.

Detent could be a couple of balls in a groove holding the spool in position, pressure detent, or friction detent.

A log splitter valve has a detent in retract. You push the lever to retract, and the lever stays in detent until a certain pressure is reached, and then the lever returns to neutral.

Some valves could also have three position detent, where the lever can lock in three position.

The kit you show is for a spring center valve to convert it for a three position detent operation.

The three position detent will lock the lever in any of the three position.

If the pump is pumping, a detent lever will allow the fluid to flow through a work port to a motor. You would not want to detent a cyl, as when tthe cyl is fully extended or retracted, the relief would activate.

What is your intended use of a detent valve?

The below data is just some of the features that can be added to some valves.

Pressure Release Detent
1 Position Detent, Spool "out" Only,
Spring Center to Neutral
F**
Pressure Release Detent
2 Position Detent, Spool "in"
and "out", Spring Center
to Neutral
Spool "C" or "E" Only
G**
4 Position, Spring Center to
Neutral, Detent Spool In for
Float Position

I would like the detent to hold the return of the cylinder after the log is split.. Should I just get a bungee cord ???