Relief Mechanism Behavior - Kubota KX080-3 Workshop Manual

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WSM KX080-3 Mechanism

2-3 Relief mechanism behavior

The pressure oil from the pump is introduced from the port A to C. The oil through the port C, connected

with the hydraulic motor, gives a rotational force to the motor.

At the relief valve A , the valve a does not open by the pressure oil. The piston d is affected by the

pressure oil to move in the direction of arrow to its stroke end. During this shift, the oil in the chamber x

flows through the orifices c and b to the port D.

At the relief valve B , on the other hand, the pressure oil from the port C opens the valve e at over a

preset pressure level, and flows to the port D. This oil passes through the orifices f and g into the

chamber y . Now the piston h is activated by the oil to move in the direction of arrow to its stroke end.

With the piston h at the stroke end, the pressure between the orifices f and g rises. The opening

pressure of relief valve B thus becomes higher than the shovel s system pressure, which closes the

The relief valves A and B behave in this way to raise the pressure at the port C and boosts the motor.

Pressure oil flow from port A

(406)Orifice f

(407)Valve e

(408)Orifice g

(409)Chamber y

(410)Piston h

(411)Piston d

(412)Orifice c

(413)Orifice b

(414)Valve a

(415)Chamber x

IV Hydraulic System

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