Hyundai HX145LCR Manual page 164

2. RETURN CIRCUIT 2. RETURN CIRCUIT
Full flow filter Oil cooler
Bypass relief valve
Bypass relief valve
1.5kgf/cm 2
2
1.5 kgf/cm
All oil returned from each actuator returns to the hydraulic tank through the main control valve.
The bypass check valves are provided in the return circuit.
The setting pressure of bypass check valves are 1.5 kgf/cm
returns to the hydraulic tank from the left side of control valve through oil cooler.
When oil temperature is low, viscosity becomes higher and flow resistance increases when passing
through the oil cooler. When the oil pressure exceeds 3.0 kgf/cm
hydraulic tank, resulting in the oil temperature being raised quickly at an appropriate level.
When the oil cooler is clogged, the oil returns directly to the hydraulic tank through bypass check valve (1).
The full-flow filter and bypass relief valve are provided in the hydraulic tank.
The oil returned from right and left side of control valve is combined and filtered by the full-flow filter. A
bypass relief valve is provided in the full-flow filter.
When the filter element is clogged, the bypass relief valve opens at 1.5 kgf/cm
pressure.
Check valve(2)
1.5kgf/cm 2
Main control valve
Check valve(1)
3.0kgf/cm 2
2
3-3
(21 psi) and 3.0 kgf/cm (43 psi). Usually, oil
2
(43 psi), the oil returns directly to the
2
2
Actuators
21073CI01
(21 psi) differential