TRACK-RUBBER 2898490 - Caterpillar

System Operation Description:The throttle linkage should operate without binding or without excessive drag. When the throttle position sensor is not connected to the throttle, the throttle should return to low idle within one second. The calibration of the throttle position sensor requires the use of Caterpillar Electronic Technician (ET).
Illustration 1 g00726080
Test Step 1. Check and Adjust the Throttle Linkage.
Inspect the throttle linkage for components with the following conditions:
Loose
Bent
Broken
Missing
Worn
Place the engine control in the OFF/RESET mode.
Connect Cat ET to the service tool connector.
Place the engine control in the ON mode. Do not start the engine.
Observe the indication for the duty cycle on the "Monitor Throttle Position Sensor Signal" screen of Cat ET.
Place the throttle lever in the position for low idle. Adjust the throttle linkage. Adjust the low idle set screw.Expected Result:When the throttle is in low idle, the duty cycle is 5 to 10 percent. After the adjustment is completed, the duty cycle increases when the throttle lever is moved from the low idle position.Results:
OK - Proceed to test step 2.
Not OK - There is a problem with the throttle position sensor.Repair: Refer to Troubleshooting, "Throttle Postion Sensor Circuit -Test".STOPTest Step 2. Adjust the Throttle Linkage.
Place the throttle lever in the position of high idle. Adjust the throttle linkage. Adjust the high idle set screw.Expected Result:When the throttle is in high idle, the duty cycle is 90 to 95 percent. When the adjustment of the high idle is made on some types of linkage, the adjustment may change the low idle position. Repeat the adjustment for low idle in order to verify that the low idle is correctly adjusted.Results:
OK - The calibration was completed and verified.STOP
Not OK - The calibration was not completed and verified. There is a problem with the throttle position sensor.Repair: Refer to Troubleshooting, "Throttle Position Sensor Circuit - Test".STOP