Title: Hydraulic control system for a dump truck

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Abstract: A system including a hydraulic pump unloaded by a first system relief valve which is piloted by a remotely controlled two position directional valve. A second system relief valve in a hydraulic cylinder exhaust line is also of the pilot operated type. A manually operable valve in the truck cab pilots the second system relief valve to provide the operator precise manual control of cylinder discharge and speed of dump body lowering. A modified system includes a solenoid actuated two position directional valve for zero back pressure pump unloading. A hydraulic lift cylinder exhausts fluid during dump body lowering past pilot controlled relief valve the pilot line of which is branched permitting separate or combined control of the pilot flow by a manual or a solenoid actuated valve. A further modified system for both truck and trailer dump body control includes a pilot operated relief valve controlled by a solenoid valve for dumping pump output at low pressure. Truck and trailer dump body sub-systems are identical including both solenoid actuated and manually actuated valves to enable precise control of both raising and lowering speeds of the dump body from the truck cab.


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