Hersheyfarm
Veteran Member
Kubota lists their pumps as load sensing. Is this a piston pump with an adjustable swash plate?
Kubota load sensing pump system
- Thread starter Hersheyfarm
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oldnslo
Super Member
Typically yes load sense is a variable volume piston pump.
Seven Gables
Platinum Member
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- jd 5115m , Ford 545D, Kubota M8540, NH t4.105 , Ford 5030, Ford 4830, NH TN 95FA, Volvo EC60E
Yes usually a axial piston pump with a swash plate that is constantly being adjusted to meet flow and pressure requirements. On a lot of the compact excavators it will have two outlets and some manufacturers count it as 2 pumps even though its just one rotating group of pistons in one cylinder. Then they piggy back a gear pump to it and call it a three pump system or a 4 pump system if there also counting the little pilot pump.
OP
Hersheyfarm
Veteran Member
So the swash plate is moved back and forth by something monitoring flow or pressure, or both.
oldnslo
Super Member
A load sense pump has a pilot line on the control that is used to sense pressure Down stream of a control valve . The pump produces flow to keep a constant pressure drop across this valve. If only one function on the valve is in operation it provides a constant flow independent of load changes. This provides a more consistent movement speed of functions.
