SE60 V Asphalt Screed Machine System Caterpillar

Screed Control System

Usage:

Screed Extender Width Control

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Illustration 1	g03815914
(1) Tractor connector (2) Left extender retract solenoid (3) Left extender extend solenoid (4) Right extender extend solenoid (5) Right extender retract solenoid (6) Screed ECM (7) Display (8) Left screed operator station (9) Keypad (10) Proportional extender control switch (11) Left extender control pendant (optional) (12) Right extender control pendant (optional) (13) Proportional extender control switch (14) Keypad (15) Right screed operator station (16) Display

Extender Electrical Schematic

The tractor electrical system provides power to the screed electrical components through tractor connector (1). CAN line communications and other functional system control signals also pass through this connector.

The extender control circuit is activated from the extender width control switches. The switches are located on the tractor operator stations (not shown), screed operator stations (8) and (15), and optional extender control pendants (11) and (12). All of the extender control switches communicate directly with screed ECM (6) via CAN lines.

The tractor stations can activate either the left screed extender or the right screed extender. The screed operator stations and control pendants activate the respective extender based on mounting position. Left operator station (8) and left control pendant (11) activate the left extender. Right operator station (15) and right control pendant (12) activate the right extender.

Software in screed ECM (6) monitors ground signals to determine the location of the screed control stations and control pendants. The screed ECM also monitors the status of the tractor operator stations. Only the active tractor station can activate the extender control circuit.

An extender speed switch on each keypad (9) and (14) toggles the maximum speed setting of the respective screed extender. Two speed settings are selected with this switch: slow or fast. These settings determine the maximum current delivered to the respective extender solenoid.

The extender control switches on the tractor operator stations and on extender control pendants (11) and (12) are digital. When pressed, these switches activate the respective extender at the maximum speed selected on the corresponding keypad. The switch logic in screed ECM (6) is programmed to ramp the speed of the extenders to the selected maximum speed setting in a given time.

When an extender control switch is pressed, a command signal is generated at screed ECM (6). In this case, the screed ECM energizes one of extender solenoids (2), (3), (4) or (5) to activate an extender as follows:

When a left extender retract switch is pressed, screed ECM (6) energizes left extender retract solenoid (2) through terminal "J1-49". This action causes the left extender to retract. A left extender retract switch is located on left extender control pendant (11) and on the active tractor operator station.
When a left extender extend switch is pressed, screed ECM (6) energizes left extender extend solenoid (3) through terminal "J1-48". This action causes the left extender to extend. A left extender extend switch is located on left extender control pendant (11) and on the active tractor operator station.
When a right extender retract switch is pressed, screed ECM (6) energizes right extender retract solenoid (5) through terminal "J1-52". This action causes the right extender to retract. A right extender retract switch is located on right extender control pendant (12) and on the active tractor operator station.
When a right extender extend switch is pressed, screed ECM (6) energizes right extender extend solenoid (4) through terminal "J1-51". This action causes the right extender to extend. A right extender extend switch is located on right extender control pendant (12) and on the active tractor operator station.

Proportional extender control switches (10) and (13) are located on screed operator stations (8) and (15). These switches allow for finer adjustment of the screed extenders.

Proportional extender control switches (10) and (13) vary an analog voltage signal to screed ECM (6). A 5-volt source is supplied to the switch. Depending on the position of the switch, the analog output signal is varied as follows:

Left motion range - 0.8V to 2.3V
Center position - 2.3V to 2.9V
Right motion range - 2.9V to 4.2V

Note: To prevent signal noise and unintentional movement of the extenders, the lower and upper ranges of the supply voltage are not used. A dead-band in the neutral position is used for a similar purpose.

The analog output signal is converted, and read in percent by screed ECM (6). When the proportional switch is in the center position, a 0-percent signal is read. When the switch is moved to the left, the signal decreases to -100 percent. When the switch is moved to the right, the signal increases to +100 percent. The signals are non-linear and are programmed as modulation curves.

Software in screed ECM (6) allows two modulation curves to be selected through displays (7) and (16). The normal curve has a shorter signal ramp from the center position to the full-travel position of the switch. A flatter, fine curve lengthens the signal ramp. The normal curve is the default selection.

When proportional extender control switch (10) or (13) is moved away from the center position, a command is generated at screed ECM (6). In this case, the screed ECM adjusts the current to extender solenoids (2), (3), (4) or (5) to activate an extender as follows:

When proportional extender control switch (10) is moved to the left, screed ECM (6) adjusts the current of left extender extend solenoid (3) to the signal curve value. This action causes the left extender to extend at a given rate.
When proportional extender control switch (10) is moved to the right, screed ECM (6) adjusts the current of left extender retract solenoid (2) to the signal curve value. This action causes the left extender to retract at a given rate.
When proportional extender control switch (13) is moved to the left, screed ECM (6) adjusts the current of right extender retract solenoid (5) to the signal curve value. This action causes the right extender to retract at a given rate.
When proportional extender control switch (13) is moved to the right, screed ECM (6) adjusts the current of right extender extend solenoid (4) to the signal curve value. This action causes the right extender to extender at a given rate.

Based on location, screed ECM (6) software assigns a priority to the screed extender control switches. The switches on control pendants (11) and (12) are assigned highest priority. Proportional extender control switches (10) and (13) are assigned middle priority. The tractor operator station control switches are assigned lowest priority.

If conflicting direction signals are generated by two extender control switches, screed ECM (6) stops the respective screed extender. In this case, all the control switches must be released, and a new command must be generated from a single switch.

If similar direction signals are generated by two extender control switches, screed ECM (6) determines priority before changing the current command. If the new command is from a higher priority control switch, the ECM changes the command to the new switch value. If the new command is from a lower priority control switch, the ECM continues to follow the higher priority command.

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Illustration 2	g03815921
Extender Hydraulic Schematic (17) Left extend cylinder (18) Right extend cylinder (19) Extender manifold (20) Left extender control valve (21) Other screed circuits (22) To return filter (23) Auxiliary pressure (24) Right extender control valve (25) Check valves

The auxiliary hydraulic system on tractor supplies auxiliary pressure (23) to the screed hydraulic components. Return oil from the extender circuit is routed back to return filter (22) on the tractor. Both supply and return connections are through quick-disconnect-type fittings located on the left rear wall of the tractor.

Supply oil is routed to extender manifold (19) for controlling width functions. Auxiliary oil is also supplied to other screed circuits (21) for crown, slope, height, and end gate functions.

Note: For information on the auxiliary hydraulic system, refer to the tractor documentation.

The extender width hydraulic system consists of extender manifold (19), two control valves (20) and (24), two check valves (25) and two extend cylinders (17) and (18). Each cylinder is controlled by a control valve with two solenoids. The solenoids control direction of oil flow through the valves. These solenoids are controlled by the extender control circuit and enable hydraulic oil flow for extending or retracting the extenders.

When the system is in the HOLD state, the solenoids on control valves (20) or (24) are not energized. In this case, the control valve remains in the spring-centered position. With the valve in this position, extend cylinders (17) or (18) are held stationary. Pilot-operated check valves (25) prevent the extenders from being pushed out by material, but allow the extenders to retract if impacted by an external force.

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Illustration 3	g03815925
Extender Hydraulic Schematic (17) Left extend cylinder (18) Right extend cylinder (19) Extender manifold (20) Left extender control valve (21) Other screed circuits (22) To return filter (23) Auxiliary pressure (24) Right extender control valve (25) Check valves

When a retract or extend command is requested by the extender control circuit, either solenoid on control valves (20) or (24) are energized. In this case, the control valve shifts position.

When the left extender retract solenoid is energized (shown), left extender control valve (20) shifts to allow supply oil flow to the rod end of left extend cylinder (17). This action causes the left extender to move inward, decreasing mat width on the left. The cylinder retracts until fully retracted or until the retract command is released. The right extender retraction function operates in the same manner.

When the right extender extend solenoid is energized (shown), right extender control valve (24) shifts to allow oil flow to the head end of right extend cylinder (18). This oil is also used to unseat the pilot-operated check valve (25), thus allowing rod end oil to flow to return filter (22). The combined action causes the left extender to move outward, increasing mat width on the right. The cylinder extends until fully extended or until the extend command is released. The left extender extend function operates in the same manner.

Screed Power End Gate Height Control

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Illustration 4	g03815927
End Gate Electrical Schematic (1) Tractor connector (2) Right end gate boost solenoid (3) Left end gate boost solenoid (4) Right end gate raise solenoid (5) Left end gate raise solenoid (6) Left end gate lower solenoid (7) Right end gate lower solenoid (8) Screed ECM (9) Left extender control pendant (10) Right extender control pendant

The power end gate control circuit is activated from the end gate height control switches. The switches are located on extender control pendants (9) and (10). There are three switches for end gate control: raise, lower, and auto. The end gate control switches communicate directly with screed ECM (8) via CAN lines.

The control pendants activate the respective end gate based on mounting position. Left control pendant (9) activates the left end gate. Right control pendant (10) activates the right end gate.

Software in each pendant monitors ground signals to determine the location of the control pendant. Each pendant must also be enabled from the respective screed station for the ECM to recognize end gate control switch signals.

When an end gate raise or lower control switch is pressed, a command is generated at screed ECM (8). In this case, the screed ECM sends a signal to energize two of the end gate solenoids to activate the corresponding end gate as follows:

Left control pendant - When the end gate raise switch is pressed, screed ECM (8) energizes the left end gate raise solenoid (5) through terminal "J1-12". The ECM also energizes the left end gate boost solenoid (3) through terminal "J1-66". This action causes the left end gate to move upward.
Left control pendant - When the end gate lower switch is pressed, screed ECM (8) energizes the left end gate lower solenoid (6) through terminal "J2-2". The ECM also energizes the left end gate boost solenoid (3) through terminal "J1-66". This action causes the left end gate to move downward.
Right control pendant - When the end gate raise switch is pressed, screed ECM (8) energizes the right end gate raise solenoid (4) through terminal "J2-3". The ECM also energizes the right end gate boost solenoid (2) through terminal "J1-68". This action causes the right end gate to move upward.
Right control pendant - When the end gate lower switch is pressed, screed ECM (8) energizes the right end gate lower solenoid (7) through terminal "J2-5". The ECM also energizes the right end gate boost solenoid (2) through terminal "J1-68". This action causes the right end gate to move downward.

The end gate auto switch enables and disables the end gate auto function for the respective side of the screed the pendant is controlling. Software in screed ECM (8) latches this switch feature.

The end gate auto function controls the height of the respective end gate automatically. The auto function has three modes: Off, Auto, and Auto stand-by.

When an end gate auto control switch is pressed, an auto mode request is generated at screed ECM (8). In this case, the screed ECM monitors several conditions before enabling auto mode for the corresponding end gate. The following conditions must be met:

The propel system must be in pave mode
The propel lever on the tractor must be in the FORWARD position
The screed must be in float mode
The respective material feed system (auger and conveyor) on the tractor must be in auto mode.

When the conditions are met, screed ECM (8) converts the auto mode request to a command to enable auto mode. In this case, the screed ECM sends a signal to energize the corresponding end gate lower solenoid (6) or (7) .

When auto mode is initiated, the respective end gate boost solenoid (2) or (3) is energized for 0.5 seconds together with the matching end gate lower solenoid (6) or (7). This action unseats a check valve in the hydraulic system to initiate end gate downward movement.

During auto mode, the end gate compression springs are reset to maintain a consistent end gate downward force. This reset is performed by screed ECM (8) cycling the signal to end gate lower solenoid (6) or (7) .

During auto mode, if an extender slope is adjusted downward, screed ECM (8) raises the respective end gate proportionally. In this case, the corresponding end gate lower solenoid (6) or (7) is de-energized while the matching end gate raise solenoid (5) or (4) is energized. This solenoid reversal remains in effect only for the duration of downward slope adjustment.

During auto mode, if the screed float condition changes, auto mode is disabled. In this case, the end gate auto control switch must be used to reactivate the auto mode feature.

Note: During auto mode, a change to the material feed status will not disable the end gate auto mode.

If the propel lever transitions out of the FORWARD position, the mode changes to auto stand-by. In this case, screed ECM (8) de-energizes only the corresponding end gate lower solenoid (6) or (7). The auto mode request remains enabled but is inactive. When all conditions are reestablished, the mode returns to auto and the respective solenoid is energized again.

When auto mode is enabled, an LED indicator above the end gate auto switch illuminates. When auto stand-by is engaged, the LED indicator above the switch flashes. When auto mode is disabled, the LED indicator is extinguished.

The respective end gate auto function is disabled by any of the following:

Off-mode is selected using the end gate auto switch.
An end gate raise or lower control switch is pressed.
The screed float mode is disabled (function turned off or screed lifted manually).

Note: When screed float mode is disabled, the auto function for both end gates is disabled.

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Illustration 5	g03815928
End Gate Hydraulic Schematic HOLD (11) Height control manifold (12) Extender height control valve (13) To return filter (14) Auxiliary pressure (15) Pressure reducing valve (16) Boost valve (17) End gate control valve (18) Pilot open check valve (19) End gate rear cylinder (20) End gate front cylinder

The auxiliary hydraulic system on tractor supplies auxiliary pressure (14) for the end gate circuit. Return oil from the end gate circuit is routed back to return filter (13) on the tractor. Both supply and return connections are through quick-disconnect-type fittings located on the left rear wall of the tractor.

Supply oil is routed to extender height manifold (11) for extender height control valve (12) and end gate hydraulic functions (when installed).

Note: For information on the auxiliary hydraulic system, refer to the tractor documentation.

The end gate hydraulic system consists of extender height manifold (11), pressure reducing valve (15), boost valve (16), control valve (17), pilot open check valve (18) and two end gate cylinders (19) and (20). The cylinders are controlled by a control valve with two solenoids. The solenoids control direction of oil flow through the valve. These solenoids are controlled by the end gate control circuit and enable hydraulic oil flow for raising or lowering the end gates.

When the system is in the HOLD state, the solenoids on end gate control valve (17) are de-energized. In this case, the control valve remains in the spring-centered position. With the valve in this position, end gate cylinders (19) or (20) are held stationary by pilot open check valve (18) in height control manifold (11).

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Illustration 6	g03815933
End Gate Hydraulic Schematic RAISE (11) Height control manifold (12) Extender height control valve (13) To return filter (14) Auxiliary pressure (15) Pressure reducing valve (16) End gate boost valve (17) End gate control valve (18) Pilot open check valve (19) End gate rear cylinder (20) End gate front cylinder

The left and right end gate hydraulic systems are identical. The above illustration shows the circuits with the raise command generated. In this case, the end gate boost solenoid and the end gate raise solenoid are energized.

Boost valve (16) normally directs reduced pressure oil from pressure reducing valve (15) to end gate control valve (17). When the boost solenoid is energized (shown), the boost valve shifts to allow direct supply oil from the auxiliary system to the end gate control valve. This higher pressure oil supply enables raising and lowering of the end gates.

When the end gate raise solenoid is energized (shown), end gate control valve (17) shifts to allow supply oil flow to the rod end of end gate front cylinder (20). The end gate front cylinder and end gate rear cylinder (19) are connected in series. This type of circuit causes the front cylinder to actuate the rear cylinder in unison. Oil for the head end of the rear cylinder is directed to return filter (13). As the cylinders retract, the end gate moves upward. This movement continues until the end gate is fully raised or until the raise command is released.

When the lower command is generated, the end gate lower solenoid is energized (not shown). In this case, end gate control valve (17) shifts to allow supply oil flow to the head end of end gate rear cylinder (19). The rear cylinder drives end gate front cylinder (20) in unison. The boost pressure unseats pilot-operated check valve (18), allowing oil from the rod end of the front cylinder to flow to return filter (13). As the cylinders extend, the end gate moves downward.

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Illustration 7	g03815952
End Gate Hydraulic Schematic AUTO (11) Height control manifold (12) Extender height control valve (13) To return filter (14) Auxiliary pressure (15) Pressure reducing valve (16) End gate boost valve (17) End gate control valve (18) Pilot open check valve (19) End gate rear cylinder (20) End gate front cylinder

The above illustration shows the circuits with the auto mode enabled. In this case, only the end gate lower solenoid is energized. However, upon initiation of auto mode, the boost solenoid is also energized for 0.5 seconds to unseat check valve (18) .

Pressure reducing valve (15) maintains a downstream pressure of 1100 kPa (160 psi). With auto mode enabled, end gate control valve (17) shifts to allow this reduced pressure supply oil to flow to the head end of end gate rear cylinder (19). The rear cylinder drives end gate front cylinder (20) in unison. Unseated check valve (18) allows oil from the rod end of the front cylinder to flow to return filter (13) .

During auto mode, the end gate lower solenoid is cycled off and on periodically. In this case, end gate control valve (17) centers, allowing a portion of the reduced pressure oil supply to vent repeatedly to return filter (13). This action allows the end gate compression springs to reset and maintains a consistent downward force.

Screed Crown Control

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Illustration 8	g03815936
(1) Tractor connector (2) Crown motor (3) Fuse and relay panel (4) Slope and crown relay fuse (5) Crown decrease relay (6) Crown increase relay (7) Screed ECM (8) Left screed operator station (9) Display (10) Keypad (11) Keypad (12) Display (13) Right screed operator station

The crown control circuit is activated from the crown control switches. The switches are located on keypads (10) and (11) of screed operator stations (8) and (13). There are two switches for crown control: increase and decrease. The crown control switches communicate directly with screed ECM (7) via CAN lines.

The crown control switches activate the crown adjustment independent of mounting position. Therefore, either operator station will set the crown angle.

When a crown control switch is pressed, a command is generated at screed ECM (7). In this case, the screed ECM controls a relay to energize a motor to activate the crown adjustment as follows:

When a crown increase switch is pressed, screed ECM (7) energizes the coil of crown increase relay (6) through terminal "J2-21". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (5) transfers to crown motor (2). The crown motor is grounded through contact "87a" of crown decrease relay (5). This circuit energizes the motor in a positive crown angle direction.
When a crown decrease switch is pressed, screed ECM (7) energizes the coil of crown decrease relay (5) through terminal "J2-20". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (5) transfers to crown motor (2). The crown motor is grounded through contact "87a" of crown increase relay (6). This circuit energizes the motor in a negative crown angle direction.

If conflicting direction signals are generated by two crown control switches, screed ECM (7) stops the crown command. In this case, the control switches must be released, and a new command must be generated from a single switch.

If similar direction signals are generated by two crown control switches, screed ECM (7) accepts the first control switch input as the current command. If the second control switch is held as the first switch is released, the ECM stops the crown command. In this case, the control switches must be released and a new command must be generated from a single switch.

Screed Slope Control

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Illustration 9	g03815938
Slope Electrical Schematic (1) Tractor connector (2) Right slope motor (3) Left slope motor (4) Slope and crown relay fuse (5) Left slope decrease relay (6) Fuse and relay panel (7) Left slope increase relay (8) Right slope decrease relay (9) Right slope increase relay (10) Screed ECM (11) Left screed operator station (12) Display (13) Keypad (14) Right screed operator station (15) Keypad (16) Display

The screed extender slope control circuit is activated from the slope control switches. The switches are located on keypads (13) and (15) of screed operator stations (11) and (14). There are two switches for slope control: increase and decrease. The slope control switches communicate directly with screed ECM (10) through CAN lines.

The operator stations activate the respective extender slope circuit based on mounting position. Left screed operator station (11) activates the left extender slope circuit. Right screed operator station (14) activates the right extender slope circuit. Software in screed ECM (10) determines the location of the screed operator stations.

When a slope control switch is pressed, a command is generated at screed ECM (10). In this case, the screed ECM controls a relay and motor circuit to activate the slope adjustment as follows:

Right operator station (14) - When the slope increase switch is pressed, screed ECM (10) grounds the coil of right slope increase relay (9) through terminal "J2-12". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (4) transfers to right slope motor (2). The slope motor is grounded through contact "87a" of right slope decrease relay (8 ). This circuit rotates the motor in a positive slope angle direction (right extender tip moves downward).

Right operator station (14) - When the slope decrease switch is pressed, screed ECM (10) grounds the coil of right slope decrease relay (8) through terminal "J2-19". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (4) transfers to right slope motor (2). The slope motor is grounded through contact "87a" of right slope increase relay (9 ). This circuit rotates the motor in a negative slope angle direction (right extender tip moves upward).

Left operator station (11) - When the slope increase switch is pressed, screed ECM (10) grounds the coil of left slope increase relay (7) through terminal "J2-11". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (4) transfers to left slope motor (3). The slope motor is grounded through contact "87a" of left slope decrease relay (5 ). This circuit rotates the motor in a positive slope angle direction (left extender tip moves downward).

Left operator station - - When the slope decrease switch is pressed, screed ECM (10) grounds the coil of left slope decrease relay (5) through terminal "J2-13". When the coil is energized, contact "87" closes to contact "30". In this case, power from the slope and crown relay fuse (4) transfers to left slope motor (3). The slope motor is grounded through contact "87a" of left slope increase relay (7). This circuit energizes the motor in a negative slope angle direction (left extender tip moves upward).

Screed Extender Height Control

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Illustration 10	g03815939
Extender Height Electrical Schematic (1) Tractor connector (2) Left extender lower solenoid (3) Left extender raise solenoid (4) Right extender lower solenoid (5) Right extender raise solenoid (6) Screed ECM (7) Left screed operator station (8) Display (9) Keypad (10) CAN A resistor (11) Right screed operator station (12) Keypad (13) Display

The extender height control circuit is activated from the extender height control switches. The switches are located on keypads (9) and (12) of screed operator stations (7) and (11). There are two switches for height control: raise and lower. The height control switches communicate directly with screed ECM (6) via CAN lines.

The screed operator stations activate the respective extender height circuit based on mounting position. Left operator station (7) activates the left extender height circuit. Right operator station (11) activates the right extender height circuit. Software in screed ECM (6) determines the location of the screed operator stations.

When a height control switch is pressed, a command is generated at screed ECM (6). In this case, the screed ECM controls a solenoid to activate the height adjustment as follows:

Right operator station (11) - When the extender height raise switch is pressed, screed ECM (6) energizes right extender raise solenoid (5) through terminal "J1-62 ". This action causes the right extender to move upward.

Right operator station (11) - When the extender height lower switch is pressed, screed ECM (6) energizes right extender lower solenoid (4) through terminal "J1-61 ". This action causes the right extender to move downward.

Left operator station (7) - When the extender height raise switch is pressed, screed ECM (6) energizes left extender raise solenoid (3) through terminal "J1-67 ". This action causes the left extender to move upward.

Left operator station (7) - When the extender height lower switch is pressed, screed ECM (6) energizes left extender lower solenoid (2) through terminal "J1-65". This action causes the left extender to move downward.

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Illustration 11	g03815941
Extender Height Hydraulic Schematic (14) Left extender manifold (15) Left extender height motor (16) Right extender manifold (17) Right extender height motor (18) Right height control valve (19) Left height control valve (20) To return filter (21) Auxiliary pressure (22) Case drain manifold (23) To hydraulic tank

The auxiliary hydraulic system on tractor supplies auxiliary pressure (21) for the extender height circuit. Return oil from the height circuit is routed back to return filter (20) on the tractor. Both supply and return connections are through quick-disconnect-type fittings located on the left rear wall of the tractor.

Note: For information on the auxiliary hydraulic system, refer to the tractor documentation.

The extender height hydraulic system consists of two extender manifolds (14) and (16), two control valves (18) and (19) and two hydraulic motors (15) and (17). Each motor is controlled by a control valve with two solenoids. The solenoids control direction of oil flow through the valve. These solenoids are controlled by the height control circuit and enable hydraulic oil flow for raising or lowering the extenders.

When the system is in the HOLD state (right shown), the solenoids on height control valves (18) and (19) are de-energized. In this case, the control valves remain in the spring-centered position. With the valves in this position, extender height motors (15) and (17) do not operate.

When an increase or decrease command is requested by the extender height control circuit, either solenoid on control valves (18) or (19) are energized. In this case, the control valve shifts position.

When the left extender raise solenoid is energized (shown), left height control valve (19) shifts to allow supply oil flow to left extender height motor (15). Supply oil flows from port "B1" of left extender manifold (14) to port "A" of the motor. In this case, the motor turns in a clockwise direction. As the motor rotates, the left extender moves upward.

Note: The height control manifolds on both extenders are identical and operate in the same manner. However, the manifold height solenoids and the motor plumbing are reversed.

Case drain oil from extender height motors (15) and (17) is routed through case drain manifold (22) to hydraulic tank (23) on the tractor.

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Illustration 12	g03815942
Electrical System (1) Power distribution module (2) Vibratory solenoid (3) Tractor CAN lines (4) From fuse "FD5" (5) From fuse "FS8" (6) From fuse "FN3" (7) Tractor/Screed harness (8) Left screed operator station (9) Left display (10) Left keypad (11) Left multifunction dial (12) To CAN resistors (13) Right multifunction dial (14) Right keypad (15) Right display (16) Right sceed operator station (17) Screed ECM

Vibratory Control

Electrical Schematic (Vibratory System)

Power Distribution

The vibratory system receives power from the tractor through the following fuses:

Fuse "FD5" (4) - Switched power transfers from this fuse to contact "C1-8" of tractor power distribution module (1). From connector "C1", the power transfers to the "RC-C2-10" terminals of screed left display (9) and right display (15). This voltage input provides the power for the screed displays. Fuse "FD5" is rated at 20 amp.
Fuse "FS8" (5) - Switched power transfers from this fuse to contact "C1-14" of tractor power distribution module (1). Power then transfers to terminal "J1-1" of screed ECM (17) and to terminals "RC-C2-9" of screed displays (9) and (15). Power also transfers to terminals "RC-C9-2" of screed keypads (10) and (14). Fuse "FS8" is rated at 10 amp.

Fuse "FN3" (6) - Unswitched power transfers from this fuse to contact "C1-16" of tractor power distribution module (1). Power then transfers to terminals "J1-31", "J1-39" and "J1-47" of screed ECM (17). This voltage input provides the power for the screed ECM. Fuse "FN3" is rated at 20 amp.

Vibratory Control Parameters

The vibratory system requires interlock parameters to be met in order to operate. The machine must be in machine forward pave mode to enable the vibratory system.

The machine is in machine forward pave mode when:

The engine is running.
The propel mode is set to "pave."
The propel lever is in the forward range.
The machine is moving forward.

The vibratory system enable delay time value is stored in screed ECM (17). This value is adjusted at either screed operator station (8) or (16). The vibratory system enable delay time prevents vibration when machine movement begins. Once machine movement begins and the delay time elapses, the vibratory system is enabled. The default delay time setting is 0.5 seconds. The maximum delay time setting is 60 seconds.

The desired vibratory speed value is stored in screed ECM (17). This value is adjusted at either screed operator station (8) or (16). The desired vibratory speed setting is shown on left and right displays (9) and (15). Multifunction dials (11) and (13) are used to adjust this setting.

The desired vibratory speed range is limited between 700 rpm minimum and 3000 rpm maximum. The default value is 0 rpm. The value set for desired vibratory speed is saved over a machine key cycle.

The vibratory switch is located on touch screen displays (9) or (15). Vibratory switches are also available on the tractor displays. The vibratory switch is used to set the status of the vibratory system on or off. The default setting is off.

Note: The vibratory switch is only available when the engine is running.

System Operation

Screed ECM (17) energizes vibratory solenoid (2) when the following conditions are met:

The vibratory status is set to ON.
The parameters for machine forward pave mode have all been met.
The vibratory system enable delay time has elapsed.

When vibratory solenoid (2) is energized, the vibratory system is enabled.

The vibratory system is disabled and vibratory solenoid (2) is de-energized when any of the following occur:

The vibratory status is set to OFF.
Any of the parameters for machine forward pave mode are not met.

The proportional current signal for activating vibratory solenoid (2) is calibrated at zero rpm and at 3000 rpm. The open-loop control system uses linear interpolation to calculate the solenoid currents required between these calibrated speeds.

Note: Maximum calibrated vibratory speed can only be achieved in high idle.

The material clean-out/warm-up mode is activated from the tractor controls. When this mode is enabled, the vibratory system is activated at 200 rpm, regardless of the vibratory switch position. The interlocks for enabling the clean out/warm up mode are controlled from the machine ECM.

Note: For more information on clean out/warm up mode, refer to the Auger and Conveyor System section of this document.

Hydraulic Schematic (Vibratory System)

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Illustration 13	g03815945
Vibratory Hydraulic System OFF (1) To generator cooling circuit (2) Charge pump (3) Vibratory and charge manifold (4) Flow compensator valve (5) Cold-start dump valve (6) Cold-start solenoid valve (7) Relief valve (8) Vibratory control valve (9) Drain orifice (10) Case drain manifold (11) Left main vibratory motor (12) Left extender vibratory motor (13) From generator sump (14) From hydraulic tank (15) To charge filter (16) To cooler bypass manifold - port "D" (17) To hydraulic tank (18) Check valve (19) Right main vibratory motor (20) Right extender vibratory motor

Note: The illustration above includes tractor components and screed components. The vibratory system uses three quick-disconnect couplings to join the two systems together. System operation is similar for any given screed mounted to the tractor.

When the engine is running, charge pump (2) generates flow. Supply oil flows to vibratory and charge manifold (3). The oil flow is divided into three branches inside this manifold. The first branch flows to flow compensator valve (4). The second branch flows to the material feed cold-start circuit comprised of cold-start dump valve (5) and the cold-start solenoid valve (6). The last branch flows to vibratory control valve (8) .

When the vibratory system is off, the vibratory solenoid is not energized. In this case, supply oil does not flow through vibratory control valve (8). Under these conditions, the vibratory motors do not rotate.

When the vibratory system is off, supply oil acts to open flow compensator valve (4) fully. This action allows full charge pump flow to charge filter (15) and on to the material feed system. When a screed is connected, check valve (18) on the screed blocks oil back-flow into the screed.

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Illustration 14	g03815948
Vibratory Hydraulic System COLD-START (1) To generator cooling circuit (2) Charge pump (3) Vibratory and charge manifold (4) Flow compensator valve (5) Cold-start dump valve (6) Cold-start solenoid valve (7) Relief valve (8) Vibratory control valve (9) Drain orifice (10) Case drain manifold (11) Left main vibratory motor (12) Left extender vibratory motor (13) From generator sump (14) From hydraulic tank (15) To charge filter (16) To cooler bypass manifold - port "D" (17) To hydraulic tank (18) Check valve (19) Right main vibratory motor (20) Right extender vibratory motor

When the engine is started in cold conditions, charge pump (2) creates a parasitic load. To reduce the load on the starting system, the cold-start circuit in vibratory and charge manifold (3) is employed. The cold-start circuit includes the cold-start dump valve (5) and cold-start solenoid valve (6) .

Note: The material feed cold-start solenoid controls cold-start solenoid valve (6) .

When cold-start solenoid valve (6) is energized, the valve opens. When the cold-start solenoid valve is open, a portion of oil flow from charge pump (2) is directed to cooler bypass manifold (16). This oil flow reduces the pilot pressure acting on cold-start dump valve (5). This reduced pilot pressure allows the charge pump pressure to open the cold-start dump valve.

When cold-start dump valve (5) is open, oil flow from charge pump (2) is directed to cooler bypass manifold (16). In this case, the charge pump pressure is decreased and the parasitic load on the engine is reduced.

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Illustration 15	g03815950
Vibratory Hydraulic System ENABLED (1) To generator cooling circuit (2) Charge pump (3) Vibratory and charge manifold (4) Flow compensator valve (5) Cold-start dump valve (6) Cold-start solenoid valve (7) Relief valve (8) Vibratory control valve (9) Drain orifice (10) Case drain manifold (11) Left main vibratory motor (12) Left extender vibratory motor (13) From generator sump (14) From hydraulic tank (15) To charge filter (16) To cooler bypass manifold - port "D" (17) To hydraulic tank (18) Check valve (19) Right main vibratory motor (20) Right extender vibratory motor

When the engine is running, charge pump (2) generates flow. Supply oil flows to vibratory control valve (8) in vibratory and charge manifold (3) .

When the vibratory system is enabled, the vibratory solenoid is energized. In this case, a large portion of supply oil flows through vibratory control valve (8) and on to the vibratory motor circuit of the screed. Under these conditions, the vibratory motors rotate.

When the vibratory system is enabled, oil pressure from vibratory control valve (8) is used as pilot pressure for flow compensator valve (4). This pressure acts to close the flow compensator valve. This action directs more charge pump oil to flow through the vibratory system before continuing to charge filter (15) and material feed system.

Relief valve (7) protects the vibratory system. The relief valve opens at 16500 kPa (2393 psi). Relief oil is directed to cooler bypass manifold (16) .

Vibratory system speed is determined by the current signal sent to the vibratory solenoid. This current controls movement of vibratory control valve (8) which controls flow to the vibratory motors. A lower current signal produces a lower vibratory motor speed. A higher current signal produces a higher vibratory motor speed. Vibratory motor speed is adjustable from 700 rpm to 3000 rpm.

The vibratory motors are arranged in a series hydraulic circuit. Oil flows through each motor in sequence beginning with left main vibratory motor (11). Left extender vibratory motor (12) is next, followed by right extender vibratory motor (20). Lastly, oil flows through right main vibratory motor (19) and is directed to charge filter (15) and the material feed system.

Each vibratory motor is also connected to a case drain circuit. Case drain manifold (10) collects motor case drain oil and directs the oil to hydraulic tank (17) on the tractor.