GEAR ASSEM. (8 teeth) 3P8019 - Caterpillar

Illustration 1 g02239095
Schematic for the RH Station Propel Speed DialThis diagnostic code is associated with the RH Station Propel Speed Dial. The FMI 04 means that the ECM has determined that the voltage of the circuit for the speed dial is below normal. Note: The RH Operator ECM is located under the RH Operator Platform.The possible causes of this diagnostic code are listed below:
The signal circuit for the speed dial is shorted to ground.
The speed dial has failed.
The ECM has failed. This situation is unlikely. Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected. Ensure that the diagnostic code of CID 1724 FMI 04 is active before performing this procedure. Note: Use the 146-4080 Digital Multimeter for the measurements in this procedure.System Response:When this diagnostic code is active, the following occurs:
Propel speed dial setting will remain at pre-fault setting until the propel lever returns to neutral.
When the propel lever returns to neutral, propel speed setting will be 50%.
Operator station fault lamp is active.Test Step 1. CHECK THE SPEED DIAL
Access the speed dial that is located inside the operator console on the right station.
Disconnect the Speed Dial from the machine harness.
Connect positive (Red) lead of a multimeter to the "B" contact of the Speed Dial connector.
Connect the negative (Black) lead of the multimeter to "C" contact of the Speed Dial connector.
Rotate the speed dial from full counter-clockwise (Minimum) position to full clockwise (Maximum) position.Expected Result:The resistance should start at 0 ohms at the minimum setting of the speed dial. As the Speed Dial is rotated, the resistance will increase to 1000 200 ohms at the maximum dial setting.Results:
OK - The resistance should start at 0 ohms at the minimum setting of the speed dial. As the Speed Dial is rotated, the resistance will increase to 1000 200 ohms at the maximum dial setting. The speed dial is operating correctly. Proceed to Test Step 3.
NOT OK - The resistance measurements for the speed dial are NOT correct.Repair: Replace the speed dial. Proceed to Test Step 2.Test Step 2. CHECK THE DIODE BLOCK
Illustration 2 g02571936
Schematic of the Diode BlockWhen a diode is tested in the "Forward" direction (Pin 2 to Pin 1), the multimeter should read 0.7 0.2 VDC. When a diode is tested in the "Reverse" direction (Pin 1 to Pin 2), the multimeter should indicate "Over Limit" (OL) status.
Table 1
Diode Block Check    
Pin Connections
Red (+) to Black (-)     Meter Reading    
2-1     0.7 0.2 VDC    
1-2     Over Limit    
2-3     0.7 0.2 VDC    
3-2     Over Limit    
3-4     0.7 0.2 VDC    
4-3     Over Limit    
Set the multimeter to the "Diode Test" mode.
Turn the key start switch and the disconnect switch to the OFF position.
Disconnect the Diode Pack from the machine harness.
Use the multimeter to test the diodes of the Diode Pack according