log splitter detent valve

[J_J]

low pressure from the pump is low pressure regardless of stroke I am only saying that checking the pressure is a good place to start and if debris got into the valve it had to gothrough the pump or it came from the pump no?

I put the autocycle valve on mine its great, but sometimes you have to adjust it in extreme temps. high or low.

Yes, you are right about the low pressure, and if one were to put a gage in a tee after the pump, they would be able to see the results of pressure in all the different functions of the log splitter, and be able to set relief valve and detent valve pressures. There should also be a tank strainer as well as the hyd return line filter, to catch that crud out of the tank.

 

[sizzami]

amen....

 

[J_J]

amen....

On your log splitter, How much reservoir volume do you have compared to pump GPM?

 

[steviep]

Well I have to say thank you for all your info , I took it apart this afternoon and there isn't much to it and there is no ajustments on it like some valves have but it is greesed from the factory and the greese was all crudded up. I cleaned it up and you have to be careful because if you take it apart thier is 4 small ball bearings and 1 large one in it. It comes apart pretty easy but it took me awhile top figure out how to get all the balls back in and the collar back on but I did it. I did lose 1 of the small balls but it still works.
It does work a little better but still sticks at times I didn't have any greese handy so I will have to greese it later.
I see you guys mention a pressure gauge , where would I put it and what size do I need and what is normal operating pressure for this type of splitter. By the way it does have a oil filter and I did change it and the fluid. (Dextrol 3 ATF ) I forgot that it took so many quarts.

 

[J_J]

Well I have to say thank you for all your info , I took it apart this afternoon and there isn't much to it and there is no ajustments on it like some valves have but it is greesed from the factory and the greese was all crudded up. I cleaned it up and you have to be careful because if you take it apart thier is 4 small ball bearings and 1 large one in it. It comes apart pretty easy but it took me awhile top figure out how to get all the balls back in and the collar back on but I did it. I did lose 1 of the small balls but it still works.
It does work a little better but still sticks at times I didn't have any greese handy so I will have to greese it later.
I see you guys mention a pressure gauge , where would I put it and what size do I need and what is normal operating pressure for this type of splitter. By the way it does have a oil filter and I did change it and the fluid. (Dextrol 3 ATF ) I forgot that it took so many quarts.

The gage should go after the pump, before the valve. 3000 psi gage. If it is a two stage pump, the high speed or initial push is around 650 psi. When it shifts to low speed and high pressure, the pressure can go up to 2500 psi. So expect to see low pressure starting out and if you get into some really tough stuff, you can hear and see when it shifts modes.

 

[engineer999]

J J has it about right. Low pressure is not an issue with one ended detents.
I'm an engineer and have designed various pumps and valves. Detents come in two basic types, in-line, and orthogonal(ie right angles). The inline versions are cheap non-adjustables frequently found on OEM systems. You can see the detent in the orthogonals, it sticks out the side.

The detention of the spool(the core to which the handle attaches) is done by a grove in the spool into which a small ball bearing is jammed when you push the lever all the way back. This stops the spool from returning to center.

Since the cylinder is simply retracting the oil pressure is super low. But when it reaches the end of the stroke the pressure forces oil past the ball and forces either the ball itself or the back inter-piston backwards against a spring. This gets the ball out of the way. This can be made to happen at pressures as low as 250 PSIG.

If the detent won't stay, then you need to tighten the adjustment nut against the spring and force the ball forward harder. If it won't release it may be too tight. If the detent requires more pressure than the release valve then the release valve opens . Adjust the nut the other way(CCW usually).

Sizzami, if the pressure can't get up to the detent pressure, then you have a major major problem. A gauge won't fix it, only confirm that you need a new pump (or release valve).