air in the FEL hydraulics

[dirtworksequip]

What's your theory? Enquiring minds want to know.

Sincerely, Dirt

 

[Wayne County Hose]

What's your theory? Enquiring minds want to know.

Sincerely, Dirt

I was looking at pictures of your machines and something came to me. I'm thinking that when parked, it appears as if the bucket is angled so that it is pulling on the cylinder rod. Pulling out the rod will increase the cylinder's total displacement. Something would have to take up the space. Your cylinder seals do a very good job of keeping fluid in, but a very poor job of keeping air out. I know, if the rod is being pulled, it pressurizes that end of the cylinder, but theoretically I believe it is possible for air to be sucked past the seals. I'm going to try an experiment. I have a couple new cylinders the size of these bucket curl cylinders in my shop. I'm going to put them on my test unit and fill them with oil, remove and cap them. Then hang them upside down with about a hundred lbs hanging off the rod and see what happens. I don't know, maybe I'm an idiot. Well, I am, but if anyone has a better theory, I'm all ears.

 

[dirtworksequip]

Or could air be entrained in the fluid as it is pumped through the system and after the machine sets for awhile, the air goes out of the fluid and creates a small air space in the cylinder which causes the bucket slop? There's a guy here by the user name of etono that worked in Area 51. I bet those Aliens have told him the answers to many of our puzzling Earthy mysteries.

Sincerely, Dirt

etono, call home!

 

[Wayne County Hose]

Dirt,

I had thought about that too. But I think that it would make all the other hydraulics bouncy too. This seems to be just the curl circuit. If you see etono, tell him we need an answer. Nanu-nanu!

 

[dirtworksequip]

Wayne County, maybe the slop movement is just more noticable on the bucket since its moving in an arc and the lift arms would only move down and would be held down by gravity. Where as the bucket would tend to move back and forth as you drove the tractor. My old JD870 had some bounce in the loader arms if I got going a little too fast on rough terrain.

Would air get entrained into the hyd. fluid as it is pumped thru the system?

Kennyd is the hydraulic expert around here, maybe he might have some insight.

I don't think etono has been posting here lately................might be out of town or be doing a little time traveling with friends.

 

[dfkrug]

Or could air be entrained in the fluid as it is pumped through the system and after the machine sets for awhile, the air goes out of the fluid and creates a small air space in the cylinder which causes the bucket slop?

I like the entrainment idea. Also note that the curl cyinder is highest,
and new tractors may not have full hyd reservoirs. To top that off, I notice
with my Kioti that if I drive up a slope, I can starve the hyd system a bit,
and "suck air". Now imagine a new tractor being backed off a trailer....