So I built a hydraulic pump today

[Iron Art]

Reg, Don't you think that without flow that pump would be expected to generate a lot of heat and might not last long . Some type of open center solonoid valve or a relief valve would be the cure and I think the pump performance would be even greater than what you observed due to the cooler oil temp. You are on the right track with your design, Good JOB! Fred

[RCP57]

Originally Posted by Iron Art

Reg, Don't you think that without flow that pump would be expected to generate a lot of heat and might not last long . Some type of open center solonoid valve or a relief valve would be the cure and I think the pump performance would be even greater than what you observed due to the cooler oil temp. You are on the right track with your design, Good JOB! Fred

Yeah you are right Fred. I just wanted to quickly see if it worked last night so that was how I hooked it up. I dug through my fittings this morning and hooked it up with a relief valve. It doesn't pump any more pressure but at least the oil has somewhere to go. I also drilled out the inlet and outlet to a larger size and although it helped with volume it is still starving a little so I may open up the inlet side more if I can. I'll keep poking at it until I destroy it or get it to work right! At least it was a little bit successful so now I'm inspired to keep trying.

Well gotta get back to wrapping gifts...

Merry Christmas!

[RCP57]

http://youtu.be/2bQNXtrWiIA
I did a little tweeking to this today. I managed to get it to pump a little more pressure and quite a bit more volume. After opening up the ports I put it back on the mill and took a skim off the gear case. It seems to have helped as it makes 150+ psi for a short time and pumps 125psi steady without fading. I guess I won't be in the shop tomorrow but maybe if I was really good this year I will get something new to play with from Santa. If I get what I asked for then this pump will be just right....

Reg