slow loader goes fast with cylinder unhooked.

[funny farmer]

A couple months ago I was screwing around with my tractor and I noticed that the loader was dumping super fast. It's always been on the slow side, to slow for me. I noticed the pin holding the cylinder on the right side had come out so it was just the left cylinder working the loader. My question is why? The right cylinder still moved in and out, so it still worked. Maybe there痴 something wrong with it? I was thinking of hooking up the right one and unhooking the left one to see if it was just as fast or it worked at all. At the time all I did was hook the right one back up again and used it at it's normal slow speed. When I say slow I mean at least 7 seconds from full curl to full dump. Compared to about 2.5 seconds without the right one hooked up. Didn't think about it again till this morning. Maybe I'll play around with it today. Was thinking when I start pushing snow maybe I'll unhook the right cylinder so I dumps fast since weight won't be that much of an issue. It's a ford 4000 with selecto-speed, and a workmaster 888 loader.

 

[JB4310]

Just a guess but if you notice it moving faster with a full bucket dumping maybe it's the weight, only has one cylinders resistance to work against, doesn't sound safe and could damage something on the loader I would think.
JB.

 

[Farmerford]

funny farmer:

Gravity, I think. When dumping gravity pulls the bucket down. So the holding cylinder (the one hooked up) receives all the fluid from the pump and allows the bucket to move down about twice as fast. Once the bucket is at full dump, the pump output then extends the unattached cylinder. But curl should be much slower, since the pump now retracts the unattached cylinder completely before the attached one moves.

 

[funny farmer]

They will both move at the same time, and the bucket was empty at the time, and then it curls at the same speed it dumps so i don't think it's gravity. But then again, if there is wieght on the 3 pt. like a heavy hay bale, the bucket dumps slower yet, but i think thats due to more pressure in the system itself.

 

[dynasim]

IF only one cylinder is moving, you only need to move half as much oil, so they will move twice as fast(exactly twice). The cylinders are hooked up in parallel so the flow is normally split between them. If you hooked them up in series, they would alway move that fast, but the force applied would be half as much, just as if there were only one cylinder.

Chris

(You can't hook them up in series for other reasons(the shaft side is a different size than the non-shaft side).

 

[funny farmer]

I was just thinking that there was something wrong with that cylinder, that would explain how painfully slow it was.

 

[dynasim]

I need to read the post with more care. My expanation doesn't cut it(you said the cylinders were both moving). Sorry, and I don't have an explanation.

Chris

 

[J_J]

See if this makes any sense. Both the cylinders are getting the same volume, but the cylinder not hooked up is seeing min pressure, where as the other cylinder is seeing the pump pressure because it is under a load, and pressure is only developed when there is some resistance. I have a gage on my lifting cylinders, and when I am lifting just the arms with no bucket , very little pressure is produced, and I can see that on the gage. I can also see spikes going above pump pressure when I am using the bucket hard, as heavy load over bumps.

 

[Soundguy]

I would think the hyds would be lazy and extend the unloaded cyl first, then it would hit it's max, an then the pressure would come up and move the loaded cyl.. fluid power, like electons is usually lazy and takes the path of least resistance..

for all intents and purposes, pressure in all common areas of the system will be almost equal.

soundguy

 

[funny farmer]

So are we all agreeing that theres isn't anything wrong then? From what I understand thats just the way hydrolic systems work.