5 - 5
Section C Electrics
9803/6410
Section C
5 - 5
Issue 1
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, the travel pilot
pressure being monitored and inhibiting the facility.
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