Hydraulic system

A hydraulic system, comprising:

• a variable displacement first pump;
• first and second linear actuators associated with a boom of a machine, the first and second linear actuators being fluidly connected to the first pump via a first closed-loop circuit;
• a variable displacement second pump;
• a first travel motor associated with a first traction device of the machine, the first travel motor being fluidly connected to the second pump via a second closed-loop circuit;
• a variable displacement third pump;
• a second travel motor associated with a second traction device of the machine, the second travel motor being fluidly connected to the third pump via a third closed-loop circuit;
• a variable displacement fourth pump;
• a third linear actuator associated with a machine stick, the third linear actuator being fluidly connected to the fourth pump via a fourth closed loop circuit;
• a first combining valve configured to selectively combine fluid from the first and second circuits;
• a second combining valve configured to selectively combine fluid from the second and third circuits;
• a third combining valve configured to selectively combine fluid from the third and fourth circuits;
• and
• a fourth combining valve configured to selectively combine fluid from the first and fourth circuits, wherein the first, second, and third linear actuators are configured to operate simultaneously while fluid from the first and fourth circuits is combined.