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| Illustration 1 | g03316715 |
Under Operator Platform (1) Vibratory pump | |
Vibratory pump (1) is located under the operator platform. This pump is driven by the engine. An access panel on the rear of the machine provides access to this component.
Vibratory pump (1) is a piston type pump with variable displacement. The pump housing contains a single rotating group that provides flow to the vibratory manifold.
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| Illustration 2 | g03316717 |
Vibratory Pump (2) Vibratory solenoid "MA" (3) Vibratory solenoid "MB" (4) Port "X2" (5) Port "X1" (6) Port "G" (7) Port "T2" (8) Port "PS" (9) Combination valve for port "B" (10) Combination valve for port "A" (11) Port "MB" (12) Port "B" (13) Port "A" (14) Port T1 | |
Each port in the pump housing is identified by a numeric or an alpha numeric designation that is cast into the housing next to the port. The function of each port is as follows:
- Port "A" (13) - This port is a system port. Port "A" is connected to port "B1" of the machine valve. Oil flows out port "A" when vibratory solenoid "MB" (3) is energized.
- Port "B" (12) - This port is a system port. Port "B" is connected to port "A1" of the machine valve. Oil flows out port "B" when vibratory solenoid "MA" (2) is energized.
- Port "G" (6) - This port is the charge inlet port. Filtered charge oil is directed into port "G".
- Port "MA" (not shown) - This port is a gauge port for the pressure at port "A". Port "MA" is plugged. System pressure can be measured on the machine valve.
- Port "MB" (11) - This port is a gauge port for the pressure at port "B". Port "MB" is plugged. System pressure can be measured on the machine valve.
- Port "PS" (8) - This port is plugged.
- Port "T1" (14) - This port is a case drain port. Port "T1" directs oil to port "C" of the return manifold.
- Port "T2" (7) - This port is a case drain port. Port "T2" is plugged.
- Port "X1" (5) - This port is plugged. The pressure on one side of the servo piston can be measured at port "X1". This port is pressurized when the supply oil is directed out port "B" of the pump.
- Port "X2" (4) - This port is plugged. The pressure on one side of the servo piston can be measured at port "X2". This port is pressurized when the supply oil is directed out port "A" of the pump.
The direction control valve is equipped with two electrical proportional (EP) solenoids. Vibratory solenoid "MA" (2) controls flow out port "B" (12) of the pump. Vibratory solenoid "MB" (3) controls flow out port "A" (13) of the pump.
The vibratory pump is equipped with two combination valves (9) and (10). Each combination valve contains a makeup and a relief valve. The relief valves limit the pressure in the circuit to 38000 ± 2000 kPa (5500 ± 290 psi). The makeup valves allow charge oil to flow into the low-pressure circuit in order to replenish the oil lost to internal leakage.
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| Illustration 3 | g03316720 |
Vibratory Pump Cross Section (15) Servo piston (16) Drive shaft (17) Swashplate (18) Slipper pad (19) Piston (20) Barrel assembly (21) Port plate | |
Engine rotation turns pump drive shaft (16), which then rotates barrel assembly (20). Pistons (19) rotate with the barrel assembly. Piston slipper pads (18) allow the pistons to follow the angle of swashplate (17). The barrel assembly only generates flow when the swashplate is not at zero angle.
When the machine electronic control system sends an output signal to an EP control solenoid, servo piston (15) correspondingly moves. As the servo piston moves, the action of the control linkage causes the angle of swashplate (17) to change. The swashplate angle is proportional to the signal from the machine electronic control system.
Slipper pads (18) follow the angle of swashplate (17). This action causes pistons (19) to move in and out of barrel assembly (20) as drive shaft (16) rotates. As a piston moves out of the barrel assembly, oil in the low-pressure circuit is drawn into the piston chamber. As a piston moves into the barrel assembly, oil is forced out of the piston chamber and into the high-pressure circuit.