5 - 5
Section C
Electrics
9803/6400
Section C
5 - 5
Issue 2*
Pump Control
Cushioned Boom Starting
Circuit Diagram
Time Chart
When the boom lowering pressure switch turns ON, the solenoid valve switches on for 0.4 sec, and pilot pressure is sent to the
negative control signal port of the pump. This pilot pressure adjusts the pump swashplate angle to temporarily reduce the output
flow and thereby initially slow down (cushion start) the boom lowering facility.
If travel and boom lowering procedure are initiated together, the boom cushioned start facility is not available, because the
travel pilot pressure is monitored to ensure smooth travel.
*
*
*
Even though travel limit and boom
lowering switches are ON, pulse to
solenoid valve does not go ON.
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