FEL how long 'should' bucked remain up when parked?

[ray66v]

The rod side of the piston, initially the low pressure side, becomes the high pressure side if fluid is getting past the piston seals, as I'm sure you know. I'm wondering if, in some cases, this high pressure then starts bleeding through the valve since it's only metal on metal between the spool and valve body.

Anything is possible, including a leaking hose.

But most of the time, I'll bet it's the internal seals in the cylinder.

 

[CalG]

Anything is possible, including a leaking hose.

But most of the time, I'll bet it's the internal seals in the cylinder.

Bucket or boom? It makes a difference,

Check recent threads of more info....
A rod can not push into a confined cylinder. Oil is not compressible.

 

[4570Man]

Bucket or boom? It makes a difference, Check recent threads of more info.... A rod can not push into a confined cylinder. Oil is not compressible.

Oil isn't compressible, but the rod can still push into the cylinder. The internal seals could leak or any point past the hose on the back could leak. If you statement was true tractor loader arms would stay raised indefinitely.

 

[CalG]

Yes

Unless the valve passed fluid.

 

[4570Man]

Have you ever taken a hydraulic cylinder apart? If the internal seal leaks the cylinder will leak down. Even if both ports are welded shut.

 

[the old grind]

I'd think of leaking piston seals right away if a bucket raised slowly or dropped while running, but as mentioned there are so many disparities when we're not.

btw, my Terramite has a leaking curl cyl (just one there) that drips constantly when I'm operating. I suspect that after >2k hrs no spools are 'locking' as 'tight' as when new b'cuz it seeps when parked and my smallest bucket (4' vs 2 5's and a 7') will drop several inches/hr when sitting, the quickest when 'hot' after digging or roading. If our buckets stay up when we're in the seat, does what happens when parked mean really all that much? :scratchchin:

 

[Deere Dude]

I have a friend who parked his bucket raised on his CUT JD and parked his JD garden tractor under it for the night. He came out a couple days later with the bucket laying on the hood of his garden tractor. Plastic isn't all it's cracked up to be.

 

[ovrszd]

Bucket or boom? It makes a difference,

Check recent threads of more info....
A rod can not push into a confined cylinder. Oil is not compressible.

Sorry, that's just not true.

 

[ovrszd]

I have a friend who parked his bucket raised on his CUT JD and parked his JD garden tractor under it for the night. He came out a couple days later with the bucket laying on the hood of his garden tractor. Plastic isn't all it's cracked up to be.

Good pun. Bet it was "cracked up" after that.

 

[CADplans]

A rod can not push into a confined cylinder. Oil is not compressible.

Sorry, that's just not true.

Can you define how to compress a hydraulic oil into a smaller space?
My physics teacher would like you to explain that!!! :confused2:

A rod going into a cylinder,, even if you remove the piston off the end of the rod,,,
requires the newly displaced fluid to go somewhere.

If the loader arms drop,,, oil must be leaking on the ground, or going past the valve.