SHAFT, DRIVE 63000501 - Caterpillar

Illustration 1 g00891351
Schematic of the Switch ("Shear/Hammer" Selector)The following procedure is for the mode select switch. This switch has two inputs to the ECM: "N/O" (wire H481-PK) and "N/C" (wire H480-GN). During normal operation, one of the switch input is open and the other input is grounded. If both inputs are in the same state, the ECM will detect a diagnostic code. The diagnostic code is detected when both switch inputs are open or shorted to the + battery.The possible causes of this diagnostic code are listed:
Both inputs are open.
A short to battery
A failed switch
The ECM may have failed. This is unlikely.Note: Ensure that CID 1179 FMI 03 is active. The following procedures may create other diagnostic codes that are detected by the ECM. Ignore these created diagnostic codes and clear the diagnostic code when this diagnostic code has been corrected. Test Step 1. CHECK FOR AN OPEN CIRCUIT.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the J1 and J2machine harness connector from the ECM.
At the J2 machine harness connector, measure the resistance from contact J2-23 (wire H481-PK) to contact J2-29 (wire G939-PK) with the switch in the N.O. position. The switch is pressed.
At the J2 machine harness connector, measure the resistance from contact J2-38 (wire H480-GN) to contact J2-29 (wire G939-PK) with the switch in the N.C. position. The switch is not pressed.Expected Result:The resistance should be less than 5 ohms for each measurement.Results:
YES - The resistance is less than 5 ohms for each measurement. Proceed to test step 3.
NO - The resistance measurement is not less than 5 ohms for one or both measurements. The harness or the switch has failed. Proceed to test step 2.Test Step 2. CHECK THE RESISTANCE OF THE SWITCH.
Disconnect the machine harness from the selector switch.
Place the switch in the N.O. position. Measure the resistance of the switch from contact 1 to contact 2 of the connector for the mode select switch. The switch is pressed.
Place the switch in the N.C. position. Measure the resistance of the switch from contact 3 to contact 2 of the connector for the blade control handle. The switch is not pressed.Expected Result:The resistance measurement should be less than 5 ohms for each measurement.Results:
OK - The resistance measurements are less than 5 ohms. The switch is correct.Repair: The machine harness has failed. Repair the machine harness or replace the machine harness. Stop.
NOT OK - The resistance is not less than 5 ohms for one or both measurements.Repair: The switch has failed. Replace the switch. Verify that the new switch corrects the problem. Stop.Test Step 3. CHECK FOR A SHORT.
The J1 and J2 machine harness connectors remain disconnected from the ECM.
The mode select switch remains disconnected from the harness.
At the J2 machine harness connector, measure the resistance from contact J2-23 and contact J2-38 to all other J1 and J2 contacts.Expected Result:The resistance measurement should be greater than 5000 ohms for each measurement.Results:
OK - The resistance measurement is greater than 5000 ohms for each