Patent ID: 9556591
Date: 2017-01-31
CPC Classifications: B60P,E02F,F15B

Claim:
1. A machine, comprising: a work tool movable through a range of motion; a swing motor configured to swing the work tool about a vertical axis; a hydraulic cylinder having a head-end chamber and being configured to raise and lower the work tool; a pump selectively fluidly connected to the swing motor and to the hydraulic cylinder to provide pressurized fluid to cause the swing motor to swing the work tool and to cause the hydraulic cylinder to raise and lower the work tool; a power source operatively connected to the pump to output power to drive the pump; a first accumulator; a swing charge valve having a normally closed position, an open position, and a charge set pressure, the swing charge valve being positioned to selectively fluidly connect the swing motor to the first accumulator, wherein the swing charge valve moves from the normally closed position to the open position and fluidly connects the swing motor to the first accumulator when a swing motor fluid pressure communicated to the swing charge valve from the swing motor is greater than the charge set pressure; and a boom charge valve having a normally closed position and an open position, the boom charge valve being positioned to selectively fluidly connect the head-end chamber of the hydraulic cylinder to the first accumulator.