MAIN CONTROLVALVE GROUPAND RETURN SYSTEM

89

MAIN CONTROLVALVE GROUPAND RETURN SYSTEM

The main hydraulic system is a Negative Flow Controlled system that supplies hydraulic power at high pressures and high flow rates to perform work. Two main hydraulic pumps supply oil to the main control valve group. The individual hydraulic circuits are controlled by valves in the the main control valve group.

The main hydraulic system supplies the following circuits: - swing - stick

- left and right travel - bucket

- auxiliary - boom

Oil returning from these circuits flows back through the return system to the hydraulic tank.