Electrical and Hydraulic Block Diagrams
Upper and Lower Pump Stacks
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| Illustration 1 | g00939130 |
Electrical and Hydraulic Block Diagram (1) Hydraulic oil tank (2) Oil cooler bypass manifold (3) Hydraulic oil cooler (4) Piston pump (upper pump stack) (5) Piston pump (lower pump stack) (6) Left auger motor (7) Right auger motor (8) Hydraulic oil filter (9) Toggle switch (left auger) (10) Machine ECM (11) Toggle switch (right auger) (12) Left position sensor (13) Right position sensor (14) Charge pump (15) Forward solenoid (upper pump stack) (16) Reverse solenoid (upper pump stack) (17) Forward solenoid (lower pump stack) (18) Reverse solenoid (lower pump stack) (19) Toggle switch (reverse direction) (29) Suction screen (44) Dial (left mix height) (45) Dial (right mix height) (AA) System pressure (AB) Charge pressure (AC) Sump (AD) Activated components (AE) First pressure reduction | |
Note: Unlike the drag conveyor, the auger conveyors will run in forward or reverse direction when toggle switch (19) is activated.
The operator can initiate a hydraulic function on the pump stacks by using the following controls:
(9) Toggle switch (left auger)
(11) Toggle switch (right auger)
(19) Toggle switch (reverse direction)
The toggle switches will send a signal to the machine electronic control module (machine ECM). The machine ECM will process the signals before sending a signal to the two solenoids that are on the upper pump stack and the two solenoids that are on the lower pump stack.
Note: The solenoids are on the EDC valve on each pump stack.
Reference: See Systems Operation, "Control Valve (Auger Conveyor)" for additional information about the EDC valves.
Left position sensor (12) and right position sensor (13) senses the height of the asphalt at the outboard sides of the auger conveyors. This signal is sent to the machine ECM. The setting for the mix height on the screen control box is sent to the machine ECM.
Note: An optional sonic sensor is available for use instead of the position sensors.
The speed ratio control for the drag conveyors controls the speed of the drag conveyors. This signal is sent to the machine ECM.
The machine ECM will process all the data and adjust the input current to the solenoids that are on the upper and lower pump stacks. As a result, the output of the piston pumps will be determined by input current from the machine ECM to the solenoids.
Charge pump (14) draws oil through suction screen (29) from the hydraulic tank. Charge oil is sent to hydraulic oil filter (8) before going to the upper pump stack and the lower pump stack.
The hydraulic system for the auger conveyors is a closed loop hydraulic system. This means that most of the oil in the system stays in the system. Some of the oil in the system will be lost by leakage and lubrication. Also, approximately 3.8 L/min (1 US gpm) of oil is sent to hydraulic oil cooler (3) from the auger conveyor motors. This is necessary in order to cool and filter the oil that would normally be trapped in the closed loop hydraulic system. Any oil that is lost through lubrication, leakage, and closed loop flushing of the oil is continually replenished by the charge pump.
Auger Assembly (Raise/Lower)
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| Illustration 2 | g00939185 |
Electrical and Hydraulic Block Diagram (1) Hydraulic oil tank (20) Toggle switch (raise/lower control) (21) Pressure manifold (22) Auxiliary pump (23) Return filter (24) Bank valve (retract cylinder) (25) Bank valve (extend cylinder) (26) Cylinder (27) Cylinder (28) Suction screen (30) Auxiliary manifold (AA) System pressure (AC) Sump (AD) Activated components | |
Auxiliary pump (22) draws oil through suction screen (28). This oil is sent to pressure manifold (21). Oil is then sent to bank valve (24) and (25) on auxiliary manifold (30) .
When toggle switch (20) is moved upward, input current is sent to the solenoid on bank valve (24). As a result, cylinders (26) and (27) will be retracted. This will raise the auger.
When toggle switch (20) is moved downward, input current is sent to the solenoid that is on bank valve (25). As a result, cylinders (26) and (27) will be extended. This will lower the auger.
The exhaust oil from the cylinders is sent back through the bank valve and to the hydraulic tank through return filter (23) .
Operation of the Auger Conveyor
Planetary Drives and Raise/Lower Cylinders
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| Illustration 3 | g00953434 |
Auger Assembly (26) Hydraulic cylinder (27) Hydraulic cylinder (31) Planetary drive (32) Left auger (33) Right auger | |
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| Illustration 4 | g00953444 |
(6) Left auger motor (7) Right auger motor (31) Planetary drives (34) Adjustment bolts | |
Note: There is an auger motor and a planetary drive for each auger conveyor.
Auger motors (6) and (7) turn planetary drives (31). Each planetary drive turns a sprocket that turns a chain. Each chain turns a sprocket on a auger.
The tension on the chain can be adjusted by adjustment bolts (34) .
Reference: See Testing and Adjusting, "Conveyor Drive Chain (Auger) - Check and Adjust" in this manual for the correct procedure for adjusting the tension on the chain.
Hydraulic cylinder (26) and hydraulic cylinder (27) are used in order to raise and lower the auger assembly.
Reference: Refer to Operation and Maintenance Manual, KEBU7016 for the information needed to raise and lower the auger assembly.
Auger Conveyor Control
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| Illustration 5 | g00953471 |
(35) Paddle for the position sensor (36) Location for sonic sensor (if equipped) | |
There is one paddle (35) (position sensor) on each side of the machine. This paddle should be adjusted so that the position sensor will deactivate when the paddle is moved to a 45 degree angle.
An optional sonic sensor is available. This sensor should be mounted at location (36).
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| Illustration 6 | g00964231 |
(37) Toggle switch (left drag conveyor) (38) Toggle switch (right drag conveyor) (39) Speed ratio control (left drag conveyor) (40) Speed ratio control (right drag conveyor) (41) Toggle switch (left auger conveyor) (42) Toggle switch (right auger conveyor) (43) Toggle switch (reverse auger direction) | |
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| Illustration 7 | g00953473 |
(44) Mix height control | |
When all of the toggle switches are in the AUTO position, the drag conveyors and auger conveyors will be controlled by the machine ECM.
The machine ECM receives data from the following sources:
(35) Position sensors
(37) Toggle switch (left drag conveyor)
(38) Toggle switch (right drag conveyor)
(39) Speed ratio control (left drag conveyor)
(40) Speed ratio control (right drag conveyor)
(41) Toggle switch (left auger conveyor)
(42) Toggle switch (right auger conveyor)
(43) Toggle switch (reverse auger direction)
(44) Dial (left mix height)
(45) Dial (right mix height)
Note: The dials for the left and right mix height adjustment is located on the left and right screed control boxes.
The machine ECM uses this data to control the solenoids on the EDC valve for each piston pump. Consequently, the speed of each hydraulic motor for the auger conveyors and the drag conveyors is controlled independently.
Reference: Refer to Operation and Maintenance Manual, KEBU7016 for additional information.