Doing a hyd post hole digger.
- Thread starter Dwiz
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I built this backhoe mounted PHD awhile back works great... here is the thread when i was building it ...hope it helps ...
www.tractorbynet.com
help converting pto phd to hyd phd
I'm in the process of fabricating a PHD to be mounted on the thumb of my back hoe .The tractor is 45 hp with a 14gpm hyd pump~2500psi. The back hoe is plumbed by a rear remote with 1/2" lines . This project is twofold being that when the phd is not installed my intent is to use the new hyd lines...
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rScotty
Super Member
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- Apr 21, 2001
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- Rural mountains - Colorado
- Tractor
- Kubota M59, JD530, JD310SG. Restoring Yanmar YM165D
I don't have any specs on the gear box, Danfos motor, or your supply pump - or know anything about that particular Summit Valve so I can't help with that. You may end up using a PTO pump for more flow.
But I do have a couple of comments on your hydraulic design drawing. Nice drawing BTW.
1. The Loader Valve doesn't show a Power Beyond adapter sleeve. The Motor Control valve does show the PB sleeve, ..but it is in the "N"? port. What is an "N? port?
2. Normally both PB ports should be labeled the same on the control valve body, and both require having a PB sleeve to transfer pressure out from the valve. When the PB port is not in use a PB sleeve is not installed and the port is blocked off.
3. It looks like your motor control valve is set up to control two different motors. Is that correct? or does the extra valve handle and hose pair control something else?
4. You have three return lines to the tank. Put some thought into keeping the fluid friction low. You can join them together with Y connectors, but the bottom leg of the Y then needs to be a larger diameter. Don't join return lines using "T" connectors.
Good luck,
rScotty
Yes, just been working on my house and wanted to post but got side tracked. Hyd valve from Summit I am not to impressed with but they work. I changed the spool over to the motor spool and when the valve was apart there was a piece missing. I used summit flat faced couplers and well lets say you get what you pay for. The gear box I got from Messicks is a mule and a half. Nice piece. Danfoss 6.9 motor no problems. 9" bit from Tractor Supply works fine.
So the first design was on the side of the loader bucket hooked to the Kubota third function.This worked fine for the first tests runs and then things got a little scary. If you dont get the loader stick in the detent spot quickly and it stays in the down position as you are digging, your gonna go for a ride that will get your attention real fast. Second test was in solid clay with the third function and loader bucket. I was down about 24/28 inches no problem but when i pulled up to get the dirt out the bit kept spinning very slow and lost all function in the hydraulics. Tried a few thing but nothing would work. I let the machine sit and cool and thank God it went back to normal. Dont care what Neil says that valve got hot and the solenoid stuck.
Third test was to not use the third function or bucket hook up anymore, so I went to Tractor Supply and bought the post hole digger, used the arm and hooked up the hyd valve to the BH lines. This worked very well in clay with an RPM between 35 & 45. I used the hyd calc from Womack Machine and I think it is spot on. I never measure flow from the machine but it definalty does the job. As for down force and rocks its not gonna work but reverse does. I took videos and will link them later but here are some teasers.
Sarbatche
New member
What about mounting it in place of a bucket on the backhoe arm?
It works fine for what im using it for now. I might make the skid steer mount for the front and center the motor with only 1 pivot not 2.