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COMPONENTS CX130
CASE TRAINING CENTER
AUGUST 2000
Cushion cancellation
When arm opening and the lever is returned to neutral, pressurized oil from control valve (a pilot of arm opening)
flows into port "D" of the cushion valve.
Electric signal is sent to a controller with hard mode at this time and the controller sends the signal to a solenoid
valve.
Then, from solenoid valve, the original pressure (40K) of pilot comes into the cushion valve from port "S" and the
cushion spool inside the valve is switched.
The pressurized oil flow from port "D" is connected direct to port "B" and return the tank through the control valve.
Such direct return changes the tank pressure and arm spool in the control valve returns to neutral immediately.
This immediate return makes a shock when stopping arm and such shock is useful for dirt dropping operation.
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