Case CX130 - Page 42

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COMPONENTS CX130
CASE TRAINING CENTER
AUGUST 2000
Cushion valve
Purpose of cushion valve
There is a cushion control valve plumbed between the arm and boom hand control valve and the control valve.
The cushion valve prevents the control spool from returning to neutral very rapidly. The pilot oil is metered as ist
returns to the hand control vale. This keap pressure boom and arm cylinder movement smooth for shock-free
operation. There is a solenoid valve to override the cushion function in the 6 solenoid valve bloc. The control for
the solenoid valve is a button on the instrument panel.
The function of this cushion valve is to restrict the return of pilot oil from the control valve spool operated.
There is an other function in the cushion valve that allows for the rapid return of the boom or arm spool if the hand
control is moved in the opposite direction.
Specifications of cushion valve
CX130 CX210
NA & EU NA & EU
Operating Pressure
Mpa 4.41 4.41
kgf/cm2 45 45
Valve ; cushion change pressure
Mpa 0.735-1.275 0.735-1.275
kgf/cm2 7.5-13 7.5-13
Orifice Dia. Of spool
Arm close 0.6/0.0 0.8/0.6
Arm open 0.6/0.0 0.8/0.6
Boom up 0.6/0.0 0.9/0.6
Boom down 0.6/0.0 0.65/0.00
Operating Temp. Range
°K 253-368 253-368
°C -20/95 -20/95
Push button
Push button