MANIFOLD 6T2845 - Caterpillar

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The switch is normally closed to ground, meaning that the park brake is released. When the switch is open, the park brake is engaged. The park brake pressure switch is used to determine the park brake has been applied. When this input indicates the park brake has been applied, the ECU will shift into first gear but will not upshift higher than first unless the engine is oversped. The logic assumes a park brake system that is spring applied and requires hydraulic pressure to release the park brake. Typically, a pressure switch is used with a trip point high enough to ensure the park brake is completely released. However, if the OEM vehicle has air brakes, a pressure switch suitable for the air system could be used.Service Brake Pressure Switch
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The switch is normally open, meaning that the service brake is released. When the switch is closed to ground, the service brake is engaged. The service brake pressure switch is used to determine when the driver is applying the brakes. The ECU will use elevated shift points, which will run the transmission in a lower gear to improve the effects of engine braking. Typically this is a pressure switch in the brake hydraulics with a relatively low trip point, similar to a sensor which activates brake lights. However, if the OEM vehicle has air brakes, a pressure switch suitable for the air system could be used. Another alternative is a limit switch mounted on the brake pedal.Primary and Secondary Gear Shifter Switch
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The shifter inputs are used by the ECU to read the desired gear from on or both keypad shifters.Note: In order to properly switch from on shifter to the other, both shifters must be in neutral, then toggling the selector switch will signal the ECU to switch from on shifter to the other. This selector switch is not required for single shifter pump applications and the single shift pad should be wired as the primary shifter.Well Service Work-over Rig Operation
The ECU will use the state of the selector switch to determine which shifter is active and will ignore the other shifter. The ECU will also run a different shift schedule based on the active shifter. The shifter in the cab must be configured by location code wiring to be the primary shifter. For the shifter in the cab, the ECU will automatically shift the transmission up and down based on output speed. The shifter on the deck must be configured by location code wiring to be the secondary shifter. For the shifter on the deck, the ECU will function in a power shift mode, shifting into the gear that is selected. The ECU will not shift into reverse when using the deck shifter. The shifter will display two alpha-numeric codes. The display on the left is the desired gear and the display on the right is the actual gear. Both shifters will display the information for the shifter that is active. For example if the