By far the best video on the subject I've seen. I believe my unloading valve must be sticking. I'm stuck in 'low speed'. Your vid showed me that I have access to remove and inspect. Thanks.
THANK YOU for this very clear and concise explanation. My reading material has been vague, confusing, and incomplete. Your presentation finally has me understanding what's happening with these pumps.
I love the breakdown of this video. I just bought a tow behind backhoe that uses a two-stage pump and does not have any power to lift the boom. What would be the first thing to look at on these pumps that could possibly fail? Remember these are China pumps. My next thing I would like to do is buy a better quality pump to replace this one so my back home can work better.
Thank you for a great tutorial of this type of pump. I have one that is leaking from the top. Everyone says they can not be fixed when leaking such as mine. They run about $200 for a new one.
Excellent explanation. Ifor Williams offers a trailer log splitter now, but I don't like their design compared to my old mtd. Their hi lo pump made me curious if I could upgrade my splitter - I'll give a $150 ebay pump a try
Hello i'm working on a project to automate an 7.20m long Sawmill, and i have a gear pump of 5 GPM, but i don't now if i would be too much slow to move the system with a 371cm3/rpm hydraulic motor?
Thank you for posting this, you made my day and answered so many questions! My log splitter is working great at this time but now there is one fewer mystery "box" on a machine I own. Now to really "figure out" and automatic transmission...vudu...
Very good video! Two of my neighbors have been working on a log splitter for 6 weeks off and on. They can not get it to work correctly. You said there was an upcoming video on making adjustments to the pump. Am I just not seeing it? This is what the have and the issue. 16 gpm 2 stage pump as shown in the video, a 17hp gas engine, a 4" bore, 2 1/2" ram, 45" travel, 6 gallons oil, oil filter, a valve rated at 25 gpm max. Pressure on host pump to valve 700 psi static 1000 in one direction. Calculations suggest 12 seconds travel pushing and 30 seconds return. It is running very slow. 45 seconds push 80 seconds return. Does this sound like a restriction or a pump adjustment? Thank you for your time! Respectfully, Kevin
Not Kevin but what RPM is the motor running at? That's the single most important factor in the Ram speed. the 16 gpm is when the pump is being driven at 3600-4000 RPM- if you're only running half the speed all you'll be getting is about 7-8 gpm which will be a lot slower than you're expecting.
I have oil leaking into the electric box through the hole for the cable going to the capacitor. Is it possible to pinpoint the fault just from this information?
My pump (looks identical) has a pressed in return line fitting. When i was splitting a block the wood shot out sideways. When that happened the back pressure blew the return line fitting off. Now when i go to put back in I can bottom it out with my fingers. How do i get it to stay put?
So, what if you were prepared to up your game on the horsepower side of things, for example (figuratively speaking) you threw a fully blown 454 Chevy Big Block up front, so HP was no longer a problem, is there a way of eeking both high volume ‘and’ high pressure out of the same pump in order to run a massive ram at respectable cycle speeds? Thanks.
no need for a 2 stage pump if you have unlimited HP. But most machines have intermittent needs for high flow, and then other scenarios where they need high pressure. So even a large excavator with a 500HP engine will still have a system that balances flow and pressure. (excavator will do it with a variable displacement piston pump, but the concept is the same). Tough digging needs high pressure, then traveling on level ground or casting material needs high flow, so the pump displacement will always be changing. Engines need to have a good load on them to stay healthy, clean and run efficiently.
@@hydraulics Thanks. I'm in the throws of making a log splitter and have had no experience with hydraulics, and of course, I want to get it right first time, so as to avoid any costly mistakes, therefore any information helps.
@@hydraulics On a single stage I see you can reverse the flow on them easily by swapping internals around. I wasnt sure if it was possible with a 2stage, or perhaps buy parts to do it ?
@@Raul28153 that would be best way. If the tank is above the pump just loosen suction line until air purges out. But unfortunately on log splitters the tank is low. So trying to fill suction hose best.
Hello, Excellent lesson. Could you please tell me how the intake suction line is held in place. Mine is leaking around that fitting and when removing the intake hose the fitting will come right out. It does not look like it is broke off and I see no threads. There is no O ring inside. I had to replace the love joy coupler and it has leaked for a while so I thought I would fix that as well, could not figure out and put it all back together and still leaks. Any help would be great. Thanks!!
I got this pump from agri supply, this one and northern pump is clockwise. I need counter clockwise to use in my bobcat. Since I cant change the pump rotation, I am going with a double v belt and the pully on the outside of belt to change rotation of pump
Halfway down on anything threaded will always provide you with the greatest adjustment range +/-. So crank it all the way down (count the turns) and then turn it back half the distance
@@harrymarshall6047 pumps don't make pressure, they make the oil flow (flow is required to overcome pressure as well so the pump could be the issue) . Your issue could be just about anywhere in the system from pump to cylinder. "No pressure" is not a quantity that helps in troubleshooting , it just lets you know you have to start troubleshooting which requires knowledge of the entire system.
In this video you mention you would show how adjusting the unloading valve would effect your log splitter. I have a 22gpm two stage pump on my splitter with a pressure gauge. Seems to be set just under 3000 psi. Could I bump it up to 3500 psi by adjusting the unloading valve?
Hystat---Are the two gears on the driven shaft keyed to that shaft---such that both the wide and narrow gears are turning at the same speed? I have one apart now and don't see that there is a 'cutaway' on the driven shaft to accommodate a key? I believe you stated in the video that these two gears are keyed to their shaft?
on this one, both wide and narrow are keyed to the longest shaft. The only gear not keyed is the other narrow one, but it will be going the same speed as it's shaft by default. Yours might drive across and back from the idler shaft. Sometimes they do that.
@@hydraulics Yes. but the two larger gears are meshed and thus the short shaft gear also runs at it's given speed----------same for the two narrow gears as they are also meshed? right. So it would seem to me that neither gear on the short shaft would need to be keyed to it's shaft? I don't quite get it why one gear--the wider one would be keyed to it's shaft?
@@DeseretRider I guess so the shaft turns. Otherwise, the shaft may not turn the same speed as the gears, or not at all, and there is no bearing inside the gears so they wouldn't want the shaft spinning a different speed from gear rpm. The bearings are on the ends. Those engineers... they think of everything!
