Why Do Modern Loaders Have Their Lift Cylinders Upside Down?

[rhamer]

I have noticed that the trend these days is for loaders to have their lift cylinders upside down (so to speak) that is with the ram at the bottom.

Is there any particular reason for this?

The only thing I can come up with is it makes the plumbing a bit neater.

Any thoughts

Cheers

Rohan

 

[Reg]

I have noticed that the trend these days is for loaders to have their lift cylinders upside down (so to speak) that is with the ram at the bottom.

Is there any particular reason for this?

The only thing I can come up with is it makes the plumbing a bit neater.

Any thoughts

Cheers

Rohan

It probably keeps the seal a little bit cleaner too, which MIGHT help them last longer.
{Guessing}

 

[Paul Vassallo]

The reason for the cylinder being up side down is to get a little more speed because there is less fluid to move if you take the shaft size out off the volume.

 

[herringchoker]

Whether it's right side up or upside down doesn't affect the speed. There is more force/ less speed when extending than when retracting.
I'm guessing Reg is on the right track - less chance of dirt and water getting at the seals.

 

[bobodu]

Oh yes....the speed will be faster because of less displacement. Just like a bucket with a rock in it will fill faster than one without. You will also have less lift capacity because of a smaller area on the working end of the piston.Not that this really matter..but it's true none the less.

 

[Ductape]

It not only makes the plumbing neater, it keeps all the hoses up on the loader arms and leaves the mast clear of obstructions so the loaders can be "quick attach".

 

[SPYDERLK]

Oh yes....the speed will be faster because of less displacement. Just like a bucket with a rock in it will fill faster than one without. You will also have less lift capacity because of a smaller area on the working end of the piston.Not that this really matter..but it's true none the less.

I think youve inverted your thinking. Take a closer look at the setup. Cyl extension happens by filling the end opposite the ram.
larry

 

[bobodu]

Oh...I see. Don't have any new stuff around here.

 

[Renze]

Most modern day loaders are quickly removable, and therefor have the hydraulic quick couplers on the right hand console. They run via the right boom, torque tube, left boom, to the left lifting cylinder.

With the rod facing down, the cylinder end remains relatively in the same position versus the fixed hose mounting positions.
Putting them with the rod end up, means that you need either large loops in the oil hoses to allow for the cylinder to extend (when hoses are attached to the boom) or you need to run the from the boom all the way back to the console and loop back to the cylinder.

The only loader i know, with the cylinders mounted with the rod up, is the 1970's loader of my neighbour, which is attached permanently to the tractor without quick couplers, it has an oil line under the belly of the tractor to feed the cylinder on the other side.

 

[Renze]

Oh yes....the speed will be faster because of less displacement. Just like a bucket with a rock in it will fill faster than one without. You will also have less lift capacity because of a smaller area on the working end of the piston.Not that this really matter..but it's true none the less.

connecting the rod side to the bottom side, to only pump in the amount of oil which is required by replacing the volume of the piston rod, is used on industrial loaders with parallel linkage. Z-bar linkage has a mechanical inversion so that the bucket rollback is done with the big side of the piston.

As long as you dont use a mechanical way to inverse the direction of the cylinder, it will still be lifting with the big side of the piston, no matter if you have the rod facing up or down.

 

[radman1]

Renze, is right on!

 

[bobodu]

I thought I made it clear when I said "I see"..

I thought someone else was arguing that cylinder speed is constant no matter which end the oil is pumped into.

 

[Paul Vassallo]

Herringchoker, the volume of fluid is not the same on both sides of the cylinder so the speed has to increase and the lift is usually more than the tractor needs before the point of refusal all that other stuff is just wrong,from a bluenoser!!

 

[SPYDERLK]

Herringchoker, the volume of fluid is not the same on both sides of the cylinder so the speed has to increase and the lift is usually more than the tractor needs before the point of refusal all that other stuff is just wrong,from a bluenoser!!

Yes, retracting the cyl is faster due to what youve said, but, no matter how theyre mounted the cyls extend when lifting the boom.
larry

 

[Paul Vassallo]

Larry that was the first Question Why the cylinders were mounted the way they were,SPEED,

 

[bobodu]

The speed is gonna be the same.Like Spyderlk said...the cylinder extends from the base.Don't matter which way it points.

 

[RickB]

Larry that was the first Question Why the cylinders were mounted the way they were,SPEED,

Oil must enter the base end of the lift cylinder in order for the cylinder to be extended hydraulically.
The boom cylinders must be extended in order for the boom to be raised.
This is true regardless of the orientation of the cylinder.
Lifting capacity and speed is identical whether the rod end of the cylinder is pinned to the boom, or the base end is because in either case, oil is pumped into the base end of the cylinder to raise the boom.
There really isn't any question about it.

 

[herringchoker]

Herringchoker, the volume of fluid is not the same on both sides of the cylinder so the speed has to increase and the lift is usually more than the tractor needs before the point of refusal all that other stuff is just wrong,from a bluenoser!!

Paul...I hate to disagree with a neighbour bluenoser and I do realize that the volume of fluid is not the same on both sides of the cylinder (that's why I said there is more force/ less speed when extending than when retracting). The speed is no different when it is extended upward than it would be if it were turned end-for-end and extended downward.

I think Renze has the answer to the OP's question.

 

[Paul Vassallo]

Here is what I was trying to say why they reverse the cylinder or Have Their Lift Cylinders Upside Down. Follow this link and check the speed times. Hydraulic Cylinder Speed - Learning Activity

 

[Berniep]

Here is what I was trying to say why they reverse the cylinder or Have Their Lift Cylinders Upside Down. Follow this link and check the speed times. Hydraulic Cylinder Speed - Learning Activity

That doesn't change anything. The cylinder still LIFTS by EXTENDING no matter which END is up.
You would have to design a loader that lifted by RETRACTING the cylinder to make it raise faster.