Screed Extender
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| Illustration 1 | g03816978 |
Right Screed Extender (1) Screed extender (2) Chrome guide tube (3) Extender cylinder (4) Walkway | |
The screed is equipped with screed extenders (1) on each side. These extenders are used to vary paving slope and width of the mat. The extenders are attached to the main screed through a triangular support configuration. This structure provides torsional resistance and rigidity. The right extender is shown in the above illustration.
Hydraulic extender cylinder (3) adjusts the width of the extender. The cylinders extend and retract the extenders on chrome guide tubes (2). The extender cylinders are controlled by switches located on each operator station. Switches for the extender cylinders are also available on the optional extender control pendants.
Each extender is equipped with walkway (4). The extender walkways move with the extender. When retracted, the extender walkways retract inside the main screed walkway. The walkways fold upward for stowage and close obstacle paving purposes.
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| Illustration 2 | g03816979 |
Left Side of Screed (5) Extender manifold (6) Left extender extend solenoid (7) Left extender retract solenoid (8) Right extender retract solenoid (9) Right extender extend solenoid | |
The extender cylinders are controlled by extender manifold (5). This manifold is located on the left side of the main screed.
Extender manifold (5) contains valves and proportional solenoids that control oil flow to the extender cylinders. The left cylinder is controlled by left extender extend solenoid (6) and left extender retract solenoid (7). The right cylinder is controlled by right extender extend solenoid (9) and right extender retract solenoid (8) .
When left extender extend solenoid (6) is energized, the left extender moves outward, increasing mat width on the left. When left extender retract solenoid (7) is energized, the left extender moves inward, decreasing mat width on the left. When right extender extend solenoid (9) is energized, the right extender moves outward, increasing mat width on the right. When right extender retract solenoid (8) is energized, the right extender moves inward, decreasing mat width on the right.
The extender solenoids are controlled by output signals from the screed ECM.
Screed Plate
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| Illustration 3 | g03816981 |
Bottom Surface of Screed (1) Base frame (2) Adjustment nuts (3) Screed plate | |
Each extender and the main screed are equipped with flat screed plate (3). These plates are mounted to the bottom of respective base frames (1).
Screed plates (3) wear through normal use and are a replaceable item. Thickness and flatness checks are made on the screed plate to determine replacement status. Generally, a screed plate should be replaced if the plate is less than 3.175 mm (0.125 inch) thick. The screed plate should be flat to within 0.76 mm (0.030 inch) along the front edge, the rear edge, and diagonally.
If screed plate (3) is not flat, adjustment nuts (2) are used to adjust the flatness of the plate.
Note: The screed must be in the null position with no crown before any flatness checks are made. For additional information, refer to the Testing and Adjusting documentation.
Thickness Control Screw
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| Illustration 4 | g03816982 |
Outboard Ends of Main Screed (1) Thickness control screw (2) Wheel latch (3) Scale | |
Thickness control screws (1) are located on the left and right side frames of the main screed. These screws allow for adjustment of the mat thickness.
During operation of a vibratory screed, thickness control screws (1) are used to change the angle of attack of the screed. These adjustments allow the operator to maintain fine control of the mat thickness. The thickness control screws have positive locking wheel latch (2). This mechanism locks the screw in place to retain the desired setting.
Each thickness control screw (1) has indicator scale (3) located at the front of the main screed. This scale indicates the relative change in the angle of attack as the thickness control screw is turned.
When thickness control screw (1) is rotated in a clockwise direction, the screw increases the angle of attack. A raised angle of attack causes the mat thickness to increase. Counterclockwise rotation of the screw decreases the angle of attack. A lowered angle of attack causes the mat thickness to decrease.
Note: Optional thickness control screws are available from service parts that reverse the adjustment rotation.
End Gate
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| Illustration 5 | g03816983 |
End of Screed Extender (1) End gate (2) End gate heater element (3) Compression springs (4) End gate jacks | |
The screed is equipped with end gates (1). The end gates prevent material from flowing around the screed. The end gates are mounted to the end of the extenders, or optional extensions.
An optional end gate heater element (2) is available. When installed, the heater prevents material from adhering to the end gate.
Height control of end gates (1) is adjusted manually or hydraulically (power option). The standard end gates are manually adjusted. Hydraulically adjusted end gates are optional.
On manually operated end gates, end gate jacks (4) control the height of the gate. When an initial mat is laid, the gate is lowered to ride on the grade. In this case, the gates create a longitudinal joint during paving. If a longitudinal joint is to be matched during paving, the gate is raised to ride on the adjacent mat.
Guides designed into end gate (1) allow the end gate wall plate to travel vertically. Two compression springs (3) keep the foot of the plate in contact with the surface. These springs force the foot to follow the profile of the surface that is being paved.
Note: Compression springs (3) must be adjusted to allow the end gate foot to follow the profile of the paving surface. If the springs are not properly adjusted, the screed may ride on the end gate. This situation increases wear on the end gate and may affect mat quality.
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| Illustration 6 | g03816984 |
Outboard End of Screed Extender (5) End gate height cylinders (6) Extender control pendant (7) Hinge provisions | |
On power end gates, end gate height cylinders (5) control the height of the end gate. The cylinders are hydraulically operated. Power end gates function in the same manner as manually adjusted end gates.
Operation of end gate height cylinders (5) is accomplished at extender control pendant (6). Each end gate is controlled by the respective pendant.
End gates may be mounted to the screed using optional end gate hinges (not shown). Hinges mount to provisions (7) located at the rear of the end gate. When installed, these hinges allow the end gate to swing to a position behind the screed, for transportation purposes.
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| Illustration 7 | g03816985 |
Right Front of Screed (8) Height control manifold (9) Pressure reducing valve (10) End gate test port (11) End gate boost solenoid (12) End gate raise solenoid (13) End gate lower solenoid | |
When optional hydraulically operated end gates are installed, each extender is equipped with augmented height control manifold (8). This manifold includes end gate functions. The right manifold (shown) is located on the outboard edge of the right extender guide block. The left height control manifold is located on the outboard end of the left extender.
Note: The hydraulically operated end gate controls share the same control manifold as the extender height adjustment. The left and right manifolds are identical and operate in the same manner.
Height control manifold (8) contains valves and solenoids that control oil flow to the end gate height cylinders. End gate lower solenoid (13) and end gate raise solenoid (12) control the direction of travel for the height cylinders. When the end gate lower solenoid is energized, the cylinders extend to move the end gate downward. When the end gate raise solenoid is energized, the cylinders retract to move the end gate upward.
End gate boost solenoid (11) controls the rate of travel for the end gate height cylinders. The boost solenoid is energized with end gate raise solenoid (12). This action increases the rate at which the cylinders retract to move the end gate upward.
When end gate boost solenoid (11) is not energized, downward speed of the cylinders is limited by pressure reducing valve (9). Also, when the end gate contacts a surface, downward pressure is limited by the valve.
End gate lower solenoid (13), end gate raise solenoid (12) and end gate boost solenoid (11) are controlled by output signals from the screed ECM. The extender control pendants on the screed generate the end gate height control input signals to the screed ECM to control these solenoids.
Note: The hydraulically operated end gate controls share the same control manifold as the extender height adjustment.
Fuse and Relay Panel
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| Illustration 8 | g03816989 |
Right Side of Screed (1) Grade and slope fuse (2) Slope and crown relay fuse (3) Left extender warning light relay (4) Crown decrease relay (5) Left extender slope decrease relay (6) Left extender slope increase relay (7) Sensor fuse (8) Extender lights and horn fuse (9) Spare 5A fuse (10) Spare 25A fuse (11) Right extender warning light relay (12) Crown increase relay (13) Right extender slope decrease relay (14) Right extender slope increase relay | |
The screed is equipped with a fuse and relay panel. The panel is located on the right side of the main screed.
The fuse and relay panel contains relays and fuses for the various systems on the screed. A cover (not shown) protects these components. The following fuses and relays are located on this panel:
- Grade and slope fuse (1)
- Slope and crown relay fuse (2)
- Sensor fuse (7)
- Extender lights and horn fuse (8)
- Spare 5A fuse (9)
- Spare 25A fuse (10)
- Left extender slope control relays - decrease (5), increase (6)
- Right extender slope control relays - decrease (13), increase (14)
- Crown control relays - decrease (4), increase (12)
- Screed extender warning light relays - left (3), right (11)