Patent ID: 8966891
Filing Date: 2015-03-03
Classification: E02F,F15B

Abstract:
1. A hydraulic system, comprising: a pump having variable displacement and over-center functionality; an actuator; first and second passages extending between the pump and the actuator to create a closed-loop circuit; a first check valve disposed within the first passage to allow fluid flow only from the pump to the actuator; a second check valve disposed within the second passage to allow fluid flow only from the pump to the actuator; a first bypass line connecting the first passage at a location between the actuator and the first check valve to the first passage at a location between the first check valve and the pump; a second bypass line connecting the second passage at a location between the actuator and the second check valve to the second passage at a location between the second check valve and the pump; and a valve configured to control fluid flow through the first and second bypass lines.