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| Illustration 1 | g06610269 |
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Steering Wheel (1) Steering wheel (2) Left armrest | |
Steering wheel (1) is on left armrest (2) of the operator station. The steering wheel is the primary means of controlling the turning angle of the machine. The steering encoder is located under the steering wheel. Movement of the steering wheel is monitored by the steering encoder. The machine ECM sends a signal to the steering encoder to control the steering wheel friction device.
The steering encoder monitors the movement of steering wheel (1) and sends this information to the machine ECM. The steering encoder uses two independent encoders that can detect steering wheel movement. The direction of steering wheel rotation is determined by comparing the phases of the encoder signals.
A steering wheel friction device is also located under steering wheel (1). This device applies a variable force to the steering wheel that causes the wheel to resist turning. The friction device is activated when the steering system is enabled.
When the machine has reached the mechanical steering limit, the highest friction level is applied to lock steering wheel (1). The friction level is proportional to the difference between the desired steering angle and the actual steering angle. The desired steering angle is determined by the steering encoder.
The actual steering angle is determined by the steering angle position sensor. The friction level prevents the operator from turning steering wheel (1) faster than the machine can respond. The friction device is controlled by the machine ECM.
Note: The propel lever direction and the 360-degree seat direction determines the direction of the machine steering. For additional information about the propel lever, refer to the"Propel System" section of this manual.
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| Illustration 2 | g06610274 |
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Under Seat (3) Right seat switch (4) Left seat switch (5) Seat rotation stops | |
Note: The machine can be built with two different options for the rotating operator station. The 180-degree seat option allows 90 degrees of seat rotation in each direction with 13 locking positions. These locking positions are located every 15 degrees. The 360-degree seat option allows 180 degrees of rotation in each direction with 22 total locking positions. These locking positions are located every 15 degrees except for the positions that are directly perpendicular to the machine. The 180-degree seat option does not have seat position switches.
The 360-degree seat position switches are at the base of the operator seat. A removable panel provides access to these components.
The machine ECM monitors the state of seat position switches to determine the position of the operator seat. When right seat switch (3) is closed and left seat switch (4) is open, the machine ECM determines the seat is facing forward. When the right seat switch is open and left seat switch is closed, the machine ECM determines the seat is facing rearward.
When both seat position switches are closed, the machine ECM determines that the operator seat is in a transitional position. When this happens, the propel system is temporarily disabled until one of the seat position switches is open.
When both seat position switches are open, the machine ECM logs a level-three fault and disables the propel and steering systems.
Seat rotation stops (5) prevent the seat from continuously rotating in one direction.
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| Illustration 3 | g06610279 |
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Articulation Area (6) Front position sensor | |
Front position sensor (6) is at the front end of the articulation area, on top of the steering pivot point.
Front position sensor (6) monitors the angle of articulation of the machine frame and sends this information to the machine ECM. The machine ECM uses this information to determine the turning radius of the machine.