Kubota KX080-4 Workshop Manual page 133

KX080-4, WSM
[C] Relief Valve
(A)At start up
• Until the shockless piston (1) reaches the end of its
stroke, the oil is released by the setting pressure (low
pressure relief) of the poppet (2).
• When the shockless piston (1) reaches the end of its
stroke, the pressure in the chamber (3) rises, and the
poppet (2) closes and the main relief valve of the
control valve opens.
These mechanisms raise the port pressure, applying
rotary force to the motor.
(B)When stopping
• When the pressure on the motor outlet side rises, it
is guided to the chamber (3) via the internal orifice.
• Until the oil supplied to the chamber (3) shifts the
position of the shockless piston and it reaches the
end of its stroke, the oil from the port is released at
the pressure setting (low-pressure relief) of the
shockless piston (1) and is guided to the port.
• Once the shockless piston (1) reaches the end of its
stroke, the pressure in the chamber (3) rises, closing
the poppet (2) and acting with the total force of the
spring and the pressure inside the chamber.
(Secondary relief pressure)
The mechanisms above stop the motor.
(1) Shockless piston
(2) Poppet
(3) Chamber
3-M37
HYDRAULIC SYSTEM
(a) Pressure
(b) Time
(c) Low-pressure relief
(primary relief pressure)
(d) Main relief
(e) Relief valve A release
timing
RY9212158HYM0032US0
KiSC issued 08, 2015 A