Hydraulic cylinder jerky

[yarg]

Hello Gentelmen,
I built a well drilling machine. It is hydraulic and all is great,,,,but? The cylinder for raising and lowering the mast does not operate right. Here are the issues :
1. Cylinder is double acting.
2. Valve is log splitter type.
3. Hoses are 1/2 inch.
4. Actuating valve causes engine stall and sever cylinder speed= very jerky mast action close to damage if not fixed.

Tried 1/16 orifice hole on one line but the same thing happened.
Your thoughts?
Thanks

 

[Stimw]

I would guess that the valve is the wrong one for your application. With double acting cyl. the non pressure side needs to be able to drain.
You might need to ask this in the Hydraulic forum.

 

[yarg]

The valve is for a wood splitter so it is for a double acting cylinder.
Stalling the engine is also a huge concern?

 

[bigdeano]

Maybe the cylinder is not large enough to lift the mast with the pressure available. It may be pushing at an angle which cuts down the lifting force on the mast. Have you worked out the math to be sure its strong enough.

 

[BHD]

air trapped in cylinder?

low on oil or filter plugged?

some thing bent and binding?

faulty valve?

the engine is either not big enough for the pump or pump to big, or the pressure relief is not working to stall out the engine,

hose coming apart in side?

rusted up cylinder inside?

a pictuer could be helpfull,

some thing slipping on the drive between engine and pump or in pump?

 

[yarg]

Air? Will bleed tomorrow. Could be but would this stall the engine?
Engine could be bigger but this is only 600 pounds of mast.
Maybe too much pressure and flow through the valve?
All else is working.

 

[stuckmotor]

I'd sure like to see some photos of that machine.

 

[yarg]

Will do photos tomorrow and post if I can figure out how?

 

[yarg]

Tried my iPad but no luck so will send pics from office computer in the am.

 

[stuckmotor]

Thank-you very much.