Log splitter help

/pine · Dec 5, 2013

Glad it's"working"...what did you trade for it?...just curious...!

wdchyd · Dec 5, 2013

mrjim0214 said:
:
Hi JJ----- At this point I have everything apart (off the machine, not opened up yet), but prior to this I had a gauge on the high pressure hose between the pump and the valve, when I push the ram against the wood or fully extend it the gauge reads 500/600 psi which is the limits of stage 1, it does not seem to want to go to stage 2 anymore. As far as you saying to put resistance against pump flow, aren't I doing basically the same thing? As far as the cylinder check, well, I got the info to do as you said after I had it all apart unfornunatly, also my valve is "hard mounted" to the cylinder with a nipple at the retract port rather than a hose, of course I can get a hose made up to bypass the nipple to preform this test, or can I check in reverse and retract fully and disconnect the extend hose?
I did go to a hydraulic shop and he watched the gauge and was fairly sure it was a pump issue, in my situation, being its all apart,would it make sense to "look" at the pump internally (I've been told the O-rings go bad) prior to putting it back together? (not that its that much to do) Also would you know where to get an exploded view view of this pump? I tried haldex directly and northern directly but got nowhere. (the time it took to do this is why its not in peices yet, lol) also can I used a ball valve for testing?

Thanks Jim

On second thought I'm putting it back together because it was really only in pieces to give the tank a good douche, spent to much time behind this screen and my mind went to muush :confused2:

You have bad advice..:confused2:... orings/seals will not bring back a worn out pump.......time for a new one if that's the issue, those log splitter pumps are throw-aways (the gear sets and housings wear out)

J_J · Dec 5, 2013

Just make sure the valve has a 3000 psi pressure rating.

I posted a breakdown of that pump long ago, and don't remember where I found it.

mrjim0214 · Dec 5, 2013

ok wdchyd.......good to know, thanks

J.J. yea they made it sound like it's part of the stealth bomber. A break down is "TOP SECRET" the best I found was a cross section of the pump on northerns website.

Talked to prince mfg about the valve, he told me those valves are "Bullet Proof"

So its all back together and gonna fire it up, check cylinder and so on, ill let ya know what i find out shortly

Thanks for everyones info do far!!!!!!!!!!

mrjim0214 · Dec 5, 2013

WOW Think I got it!!!! fired it up and couldnt get but 200 psi on forward stroke, retracted it full and detent kicked out like it should, pushed handle and held it and got 2500 psi instantly! this tells me pump is good, piston is good----------it's gotta be that "bullet proof" valve !!!!!!!!!! correct????

jdhacker · Dec 14, 2013

Ok guy's im back in need of help. I got the splitter going it's a brave with all the factory parts on it. But someone had messed with the splitter when I got it. The problem is it's not getting above 700lb of pressure, at 700 pounds it pulls the motor down and almost kills it. Its like it's not getting in to the high pressure side of the pump. This is the pump John Barnes 1001054

Also it's a 5hp briggs in good shape, and it's full of hydraulic fluid

SSdoxie · Dec 14, 2013

jdhacker said:
Ok guy's im back in need of help. I got the splitter going it's a brave with all the factory parts on it. But someone had messed with the splitter when I got it. The problem is it's not getting above 700lb of pressure, at 700 pounds it pulls the motor down and almost kills it. Its like it's not getting in to the high pressure side of the pump. This is the pump John Barnes 1001054

Also it's a 5hp briggs in good shape, and it's full of hydraulic fluid

Somewhere on that pump is a check valve that is supposed to close when pump section 1 reaches the by-pass point and starts circulating oil internally. If that check valve sticks open the flow under pressure from pump section 2 will take path of least resistance and flow back into section 1 and recirculate inside the pump. Different brands of pumps may have different style of relief and check valves but theory of operation is same.

Here is an old thread I found post #2 gives a good breakdown of the Haldex pump.

http://www.tractorbynet.com/forums/hydraulics/110334-adjusting-unloading-2-stage-log.html

triptester · Dec 15, 2013

Let me try to explain how a 2-stage pump works. Unlike a mechanical transmision it does not shift gears or down shift.
There are 2 pumps in one housing. A small pump which sends fluid to the system at all times. The second pump is much larger and has a by-pass built into it. When pressure is low both pumps send fluid to the system. When pressure increases to a preset adjustable pressure ( 600-900psi ) the by-pass on the large pump opens sending fluid back to the suction side and a check valve closes between the large and small pumps discharges. The small pump requires only about 1/3 the hp. to reach the maximun pressure as would be needed to operate both pumps.
If the engine is stalling at 700psi then this is a indication that the by-pass is not openning.

jdhacker · Dec 15, 2013

Well I took the pump apart today, the high pressure gear set was broke. Picked up a new pump and will install it tomorrow. Thanks for all the help guys.