3412, 3412C, and 3412E Generator Set Engines Caterpillar

System Calibration

Note: Perform the following procedure in order.

1. Turn the engine control switch to the OFF position.

2. Connect Caterpillar Electronic Technician (ET) to the service tool connector.

3. Remove the rack solenoid and the cover of the governor housing.

4. Remove the shutoff lever.

5. Remove the plugs from the governor housing.

6. Install the 4C-9581 Rack Zero Pins in the top of the fuel injection pump housing. Move the bar of the rack control in order to engage both pins behind the rack.

7. Turn the engine control switch to the ON position.

8. Select the "Calibrate/Monitor" screen on Cat ET. Next, select the "Rack Position Sensor Calibration" screen.

9. Move the control bar of the rack 25 mm (1.0 inch) toward the front of the engine. Block this position.

10. With the rack against the zero pins, read the status of the rack position on Cat ET.

    Note: If the reading of the rack position is 9.5 ± 0.05 mm (0.37 ± 0.002 inch), the rack position sensor is calibrated correctly.

    Note: If the reading of the rack position is not 9.5 ± 0.05 mm (0.37 ± 0.002 inch), the rack position sensor is not calibrated correctly. Continue to follow the procedure.

11. Use a 136-3124 Slotted Socket to loosen the locknut on the rack position sensor.

12. Make sure that the wiring of the rack position sensor is connected to the engine harness.

13. Select the screen "Rack Position Sensor Calibration" on Cat ET.

14. Make sure that the engine control switch is in the ON position.

15. Turn the collar of the rack position sensor clockwise or counterclockwise. The direction is indicated by Cat ET. Turn the collar until "Calibrated" is displayed.

16. Tighten the locknut to 55 ± 7 N·m (41 ± 5.0 lb ft).

17. Check that the rack position sensor is calibrated after the locknut is tightened.

18. Turn the engine control switch to the OFF position.

19. Install the rack solenoid.

20. Install the shutoff lever. Install the cover of the governor housing.

21. Remove the 4C-9581 Rack Zero Pins.

22. Install the plugs in the top of the fuel injection pump housing.