TUBE AS-RADIATOR 4600226 - Caterpillar

Conveyor OFF
Illustration 1 g01232736
Oil Distribution
When the engine is running, the first section of the conveyor pump delivers oil to port "P1" of the conveyor manifold. Inside the conveyor manifold, this oil flows to the main relief valve for the collecting conveyor, to the collecting conveyor motor bypass valve, and to the collecting conveyor motor inlet valve.When the engine is running, the second section of the conveyor pump delivers oil to port "P2" of the conveyor manifold. Inside the conveyor manifold, this oil flows to the main relief valve for the upper conveyor, to the upper conveyor control valve, and to the differential pressure valve.When the conveyor is not operating, none of the conveyor solenoids are energized. In this case, supply oil from the first section of the conveyor pump flows across the spool of the collecting conveyor motor bypass valve and through the cross over check valve. This oil is directed out port "T2" of the conveyor manifold. Oil from port "T2" of the conveyor manifold is sent through the hydraulic oil cooler. The cooled oil is then sent through the return filter and deposited in the hydraulic tank.The pressure differential valve directs oil from the second section of the conveyor pump out port "T1" of the conveyor manifold. This oil flows through the return filter and the oil is deposited in the hydraulic tank.Conveyor ON (BOOST)
Illustration 2 g01232738
Collecting Conveyor (Operating)
When the conveyors are operating, the collecting conveyor motor bypass solenoid is energized, and the collecting conveyor motor inlet solenoid is energized. When the collecting conveyor motor bypass solenoid is energized, supply oil cannot flow across the valve spool. When the collecting conveyor motor inlet solenoid is energized, supply oil flows out port "C1" of the conveyor manifold to the first stage conveyor motors.Upper Conveyor Motor (Operating)
When the conveyors are operating, the upper conveyor solenoid is energized. The upper conveyor solenoid is a proportional solenoid. This solenoid meters supply oil into the line to the upper conveyor motor. The amount of oil which is directed through the motor is proportional to the position of the conveyor speed dial on the instrument panel.When the conveyor speed dial is in the RABBIT position, the upper conveyor valve is completely open. Under this condition, all of the supply oil from the upper conveyor pump is forced to flow through the upper conveyor motor. As the conveyor speed dial is moved toward the TORTOISE position, the upper conveyor valve begins to close. This action causes some supply oil to flow through the differential pressure valve. This oil bypasses the upper conveyor motor. The greater the bypass flow, the slower the conveyor speed.Conveyor BOOST
When the conveyor boost solenoid is energized, the conveyor boost valve directs oil from the auxiliary circuit to the upper conveyor motor. This oil supplements the flow from the upper conveyor valve, and the motor operates at a higher speed.Conveyor Stopping
When the conveyor system is stopped, the inertia in the system attempts to keep the conveyor motors rotating. The cross over check