Adding a cylinder mount to rear blade

Chilly807 · Dec 23, 2010

There isn't really much doubt that I have supply relief only, not on the work ports. My only option is to tee in a relief valve on both work hoses, with a third line to dump any relieved oil back to the sump. In all honesty, that probably isn't going to happen until I have time and money on my hands, which isn't likely anytime in the near future.

So, until then it's a calculated risk. It has to be used with common sense, which I agree is not as common as the term implies.

Chilly807 · Jan 1, 2011

A few modifications since the original install, the old cylinder got bent from overextension. The mount had to be re-engineered/replaced, the thread detailing the process is here.

http://www.tractorbynet.com/forums/hydraulics/192127-cylinder-travel-limiter.html

LD1, while I was replacing the cylinder, I went with a 3 inch bore and the distance from the pivot to the cylinder mount is 10 inches. With no relief in the work ports, to develop 3000 psi in the cylinder would require nearly 6000 pounds of force on the blade tip, at least on the large diameter of the piston. Less on the small diameter, 4400 lbs, since the new cylinder has a 1.5 inch rod instead of 1.25 on the old one.

With the safety factor built into hoses and cylinders etc, this should be relatively safe, I suspect the blade will bend before I get to either of those points.

Sean

LD1 · Jan 1, 2011

Chilly807 said:
A few modifications since the original install, the old cylinder got bent from overextension. The mount had to be re-engineered/replaced, the thread detailing the process is here.

http://www.tractorbynet.com/forums/hydraulics/192127-cylinder-travel-limiter.html

LD1, while I was replacing the cylinder, I went with a 3 inch bore and the distance from the pivot to the cylinder mount is 10 inches. With no relief in the work ports, to develop 3000 psi in the cylinder would require nearly 6000 pounds of force on the blade tip, at least on the large diameter of the piston. Less on the small diameter, 4400 lbs, since the new cylinder has a 1.5 inch rod instead of 1.25 on the old one.

With the safety factor built into hoses and cylinders etc, this should be relatively safe, I suspect the blade will bend before I get to either of those points.

Sean