Explanation of Kubota LA1353 loader specs

[RickB]

But happen at a snails pace! Try to put it claim to work in the real world nit to slide ruler dreams.
At idle lift that load near max capacity. Then lift it at 540 pto rpm where everything is rated at. Bet you get very different results. Are you man enough to let life meet the road?
Will you admit the difference? I have a prediction!

Man enough? Pretty tough aren’t you? I live in the real world and listen to guys like you every day. You think you know it all. Lift capacity specs have zero to do with speed and flow and everything to do with pressure and geometry. You might live long enough to learn that or you might not. Show me where lift speed is part of the lift at the pivot pin spec. Can you do that? You keep harping about flow and speed, where are they in the spec sheets?
Insulting me to hide your total lack of understanding is a child’s strategy. A pump that passes an efficiency test will lift the same load at idle as WOT. Grow up or go away.

 

[TmbrWlkr]

Now now ........ everyone be nice

 

[rider0]

But happen at a snails pace! Try to put it claim to work in the real world nit to slide ruler dreams.
At idle lift that load near max capacity. Then lift it at 540 pto rpm where everything is rated at. Bet you get very different results. Are you man enough to let life meet the road?
Will you admit the difference? I have a prediction!

Once a tractor's engine RPMs are sufficient to reach maximum hydraulic pressure in the system at the activated cylinder (based upon frictional pressure loss in the lines and the cylinder's rate of movement), additional hydraulic fluid flow will not increase the force output by the cylinder, since it's simply proportional to the hydraulic pressure driving it. Most of my tractors are able to run full hydro pressure just a bit above idle, so e.g. my lift height won't change even if I increase the RPMs from 1000 to 2800. The only difference is that the power has increased (doing a certain amount of work over a shorter period of time).

 

[Bentrim]

May I get in he middle? Think of hydraulics as a water hose. If you have a set flow with no restriction which means no pressure the water will not go very far out of a hose held horizontally no mater the size of the hose. Reducing the size MAY increase the distant due to the velocity of the water. Now using the same hose put you finger over the end the pressure will increase, the water will go farther due to the restriction which increases the pressure in the hose. Now just what that have to do with hydraulics? hydraulics follow the same principles a pump that put out 10 gallon per minute and a pump that puts out 30 gallons per minute both will lift the same amount when the relief valve is set at the same setting the 30 gallon pump will only do it faster,. Remember the pump only moves fluid it does not "create" pressure. It takes a load or restriction to "make" pressure. Now with this in mind consider how much force a cylinder can generate. The larger the area of the piston the more force can be created. The larger the piston the slower the cylinder will move using the same size pump due to more oil being used for the "cavity" to be filled. As has been stated the only difference increasing the speed of the pump will do in increase the rate of flow. It will not increase the amount of lift in a good tight system. Now on a worn or a system that has internal leaks speeding up the pump may increase due to the flow overcoming those leaks and slightly increasing the pressure as long as the pressure does not exceed the relief valve setting.

Here check me out. Also notice there a no use of flow rates used.

Hydraulic Force vs. Pressure and Cylinder Size

Calculate hydraulic cylinder force.

www.engineeringtoolbox.com

 

[chiefbuzzbee]

May I get in he middle? Think of hydraulics as a water hose. If you have a set flow with no restriction which means no pressure the water will not go very far out of a hose held horizontally no mater the size of the hose. Reducing the size MAY increase the distant due to the velocity of the water. Now using the same hose put you finger over the end the pressure will increase, the water will go farther due to the restriction which increases the pressure in the hose. Now just what that have to do with hydraulics? hydraulics follow the same principles a pump that put out 10 gallon per minute and a pump that puts out 30 gallons per minute both will lift the same amount when the relief valve is set at the same setting the 30 gallon pump will only do it faster,. Remember the pump only moves fluid it does not "create" pressure. It takes a load or restriction to "make" pressure. Now with this in mind consider how much force a cylinder can generate. The larger the area of the piston the more force can be created. The larger the piston the slower the cylinder will move using the same size pump due to more oil being used for the "cavity" to be filled. As has been stated the only difference increasing the speed of the pump will do in increase the rate of flow. It will not increase the amount of lift in a good tight system. Now on a worn or a system that has internal leaks speeding up the pump may increase due to the flow overcoming those leaks and slightly increasing the pressure as long as the pressure does not exceed the relief valve setting.

Here check me out. Also notice there a no use of flow rates used.

Hydraulic Force vs. Pressure and Cylinder Size

Calculate hydraulic cylinder force.

www.engineeringtoolbox.com

Thank you, and you did it very calmly which we all should be doing. This crazy world we live in has more than enough stress.