2 stage pump question

[Eyecatcher]

I have a home-made log splitter that works great,but is extremely slow. It has a 4" cylinder, Dayton 11gpm pump (4Z703) and 6.5 Honda clone. I have a pressure gauge installed on the "push side" of the valve to cylinder line. How do I set the pressure point where it shifts from low to hi? Acts to me like it's always in 1st stage. Is there a way to check that?

 

[J_J]

This 11 GPM 2 stage pump is adjustable from 400 to 900 psi.

Surplus Center - 11 GPM 2 STAGE HYD PUMP

Install a pressure gage in the system and adj the switch over pressure according to the instructions that came with the pump. Maybe call Dayton for adjustments.

The pump is only pumping abobut 3.4 GPM at high pressure, and a gage will show that.

The pump is supposed to start out fast, and when the shift load is met the pump shifts pressure, and GPM. It does so automatically.

 

[Eyecatcher]

I have the brochure that came with the pump, many years ago, and it pumps 3.3 & 10.76 gpm, but doesn't give me an adjustment procedure. it says it's factory adjusted for 550PSI, but I'm sure over the years I've fooled with it. With the gauge installed, what will be the indication that it shifts?

 

[oldnslo]

Cylinder speed will change when the pump shifts from low pressure - hi volume to high pressure - low volume.

 

[J_J]

If you want to know if the high flow is there, remove the cyl hose and place in a bucket and compute the GPM. If the pump can pump 10 GPM per minute, then in 30 sec, you can fill the 5 gal bucket, or 1/2 of the 5 gal bucket in 15 sec.

If you install a gage, you can see the shift over.

Most of your wood will be split at high flow, and low pressure.

 

[LD1]

You could time it to see if you have high flow.

With NO load (or wood to split) just extending it out, assuming a 24" long 4" cylinder, it should take a tad over 7 seconds to extend all the way.

IF you dont have the high speed, @ 3.3gpm, it would take closer to 24 seconds to extend fully.

Since you already have a guage installed, what pressure are you seeing to just extend with no load?? I am not sure how your splitter is set-up, but whatever guides/holds the cylinder down to the beam on the wedge end could be binding and causing more than 550psi to extend, and thus it stays in low speed mode?? But with no load, your guage should barley move. Maybe 100psi at most to extend. IF it is a low reading like 100, and takes a full 24 seconds to extend with no load, then something is wrong with the pump and it is stuck in low speed.