Hyundai HX145 LCR, Manual

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3-2
The main hydraulic circuit consists of suction circuit, delivery circuit, return circuit and drain circuit.
The hydraulic system consists of one main pump, one control valve, one swing motor, four cylinders
and two travel motors.
The swash plate type variable displacement axial piston pump is used as the main pump and is
driven by the engine at ratio 1.0 of engine speed.
1. SUCTION AND DELIVERY CIRCUIT 1. SUCTION AND DELIVERY CIRCUIT
To cylinders To motors
Main control valve
To hydraulic oil tank
Suction strainer
Main pump
To oil cooler
Hydraulic oil tank
GROUP 2 MAIN CIRCUIT GROUP 2 MAIN CIRCUIT
The pumps receive oil from the hydraulic tank through a suction strainer. The discharged oil from the
pump flows into the control valve and goes out the tank ports.
The oil discharged from the main pump flows to the actuators through the main control valve.
The main control valve controls the hydraulic functions.
The return oil from the actuators flows to the hydraulic tank through the main control valve and the oil
cooler.
140L3CI01