Hydraulic system for a vehicle

A method of operating a lift device, the method comprising:

• providing, by a charge pump, a first flow of pressurized fluid;
• receiving, by a user interface, a first request from a user to propel the lift device;
• controlling, by processing circuitry operatively coupled to the user interface, a valve assembly to direct all of the first flow of pressurized fluid to a drive pump in response to receiving the first request, the drive pump being configured to power a hydraulic motor to propel the lift device;
• providing, by the charge pump, a second flow of pressurized fluid;
• receiving, by the user interface, a second request from the user to move a boom assembly of the lift device;
• and
• in response to receiving the second request, controlling, by the processing circuitry, the valve assembly to both (a) direct a first portion of the second flow of pressurized fluid to the drive pump and (b) direct a second portion of the second flow of pressurized fluid to a hydraulic actuator coupled to the boom assembly.

A lift device, comprising:

• a chassis;
• an implement coupled to the chassis;
• a hydraulic actuator coupled to the implement and the chassis and configured to move the implement relative to the chassis;
• a first pump coupled to the chassis;
• a second pump coupled to the chassis and configured to provide a flow of pressurized fluid to the first pump;
• an activator valve fluidly coupled to the first pump and repositionable between a first position and a second position;
• and
• a diverter valve fluidly coupled to the activator valve, the first pump, and the second pump,
• wherein all of the flow from the second pump passes through at least one of the activator valve or the diverter valve and is directed to the first pump when the activator valve is in the first position;
• wherein the diverter valve is configured to divert a portion of the flow from the second pump to the hydraulic actuator when the activator valve is in the second position;
• wherein the second pump is fluidly coupled to the first pump through the activator valve at least one of (a) when the activator valve is in the first position or (b) when the activator valve is in the second position;
• and
• wherein the portion of the flow from the second pump diverted by the diverter valve passes through the activator valve when the activator valve is in the second position.