Instrument Panel
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| Illustration 1 | g01229036 |
(1) Parking brake switch (2) Flow divider switch (3) Parking brake switch (4) Travel direction switch (5) Propel lever (6) Shift switch (7) Propel lever (8) Travel direction switch | |
The instrument panel contains several components of the propel control system. The instrument panel can be divided into three sections: right, left and center. The left section of the instrument and the right section of the instrument panel contain duplicate controls.
Parking Brake Switch
Parking brake switches (1) and (3) are push button switches with two positions. These switches are wired in a series circuit. The parking brake switches control the parking brake solenoid. The parking brake switches also provide input signals to the machine ECM.
When both parking brake switches (1) and (3) are in the RELEASE position, the parking brake solenoid is energized. The machine ECM reads a complete circuit at terminal "25". When either parking brake switch is in the ON position, the parking brake solenoid is de-energized. The machine ECM then reads a complete circuit at terminal "12". When the parking brake switch is in the ON position, the machine ECM disengages the propel system.
Flow Divider Switch
Flow divider switch (2) is located on the center section of the instrument panel. The flow divider switch is a toggle switch with two positions. The bottom position is the OFF position. The top position is the ON position. The flow divider switch receives power from circuit breaker "CB11". When this switch is in the ON position, power transfers to the flow divider solenoid.
Travel Direction Switches
The instrument panel is equipped with two travel direction switches (4) and (8). These toggle switches have three positions. The center position of the switch is the HOLD position. The top position of the switch is the FORWARD position. The bottom position of the switch is the REVERSE position. The travel direction switches are spring returned to the HOLD position, from the FORWARD position, and from the REVERSE position.
Travel direction switches (4) and (8) are wired in a series circuit. The machine ECM monitors the circuit at terminal "14" and the machine ECM monitors the circuit at terminal "15" in order to determine the position of the travel direction switches. When the circuit at terminal "14" and the circuit at terminal "15" are both complete, the machine ECM determines that the travel position switches are in the HOLD position. The machine ECM determines that one of the travel direction switches has been moved to the FORWARD position when the circuit at terminal "14" is complete and the circuit at terminal "15" is open. The machine ECM determines that one of the travel direction switches has been moved into the REVERSE position when the circuit at terminal "14" is open and the circuit at terminal "15" is closed.
Propel Levers
Propel levers (5) and (7) are mechanically connected. This connection ensures that both levers are in the same position. A pulse width modulated sensor is connected to the left propel lever.
The machine speed is proportional to the position of propel levers (5) and (7). When the propel levers are in the TORTOISE position, the machine is in NEUTRAL. As the levers are moved toward the HARE position, the machine speed increases. The direction of travel is determined by travel direction switches (4) and (8) .
Shift Switch
The machine is equipped with single shift switch (6). This switch is located on the right side of the instrument panel. The shift switch is a toggle switch with two positions. The shift switch allows the machine's propel system to operate in two speed ranges. When the switch is in the bottom position, the propel system operates in the low range. When the switch is in the top position, the propel system operates the machine in the high range. The low range allows a maximum travel speed of 38.7 m/min (127 ft/min). The low range should be used during milling operation. The high range allows a maximum range of 104 m/min (340 ft/min). The high range should be used for transporting the machine.
Shift switch (6) receives power from circuit breaker "CB1". The switch controls the shift solenoid. When the switch is in the L position, the shift solenoid is de-energized, and the machine operates in low range. When the switch is in the H position the shift solenoid is energized, and the machine operates in the high range.