Patent ID: 9567986
Date: 2017-02-14
CPC Classifications: F02N,F04B

Claim:
1. A hydraulic system, comprising: a first hydraulic pump; a hydraulic tank coupled to the first hydraulic pump; a second pump unit coupled to the first hydraulic pump via a supply line and the hydraulic tank via a return line, wherein the second pump unit is drivably operated based on pressurized fluid discharged from the first hydraulic pump; a hydraulic starter coupled to the first hydraulic pump via the supply line and the hydraulic tank via the return line, wherein the hydraulic starter is drivably operated based on pressurized fluid discharged from the first hydraulic pump; a first solenoid valve on the supply line coupled between the first hydraulic pump and the second pump, wherein the first solenoid valve is selectively movable between an open position and a closed position; a second solenoid valve on the supply line coupled between the first hydraulic pump and the hydraulic starter, wherein the second solenoid valve is selectively movable between an open position and a closed position; and a relief valve coupled between the supply line and the return line upstream of the first and second solenoid valves, wherein the relief valve is movable to an open position when hydraulic pressure in the supply line is greater than a predetermined pressure to thereby allow hydraulic fluid to move through the relief valve to the return line to the hydraulic tank.