MAST AS. 3C8737 - Caterpillar

Illustration 4 g01206959
Terminal locations at the engine interface connector that are associated with the emergency stop switch
(4) +Battery
(23) Emergency stop
Illustration 5 g01206963
Terminal locations at the connector for the emergency stop switch
(5) +Battery
(11) Emergency stop
Illustration 6 g01210818
Terminal locations at the ECM relay that are associated with the emergency stop switch
(5) Emergency stop
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the emergency stop switch.
Check the torque of the allen head screws for the engine interface connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.
Check the harness and the wiring for abrasion and for pinch points from the battery to the ECM relay. Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring are free of corrosion, of abrasion, and of pinch points.Results:
OK - The connectors and wiring appear to be OK. Proceed to Test Step 2.
Not OK - The connectors and/or wiring are not OK.Repair: Repair the wiring and/or the connectors. Replace parts, if necessary.STOPTest Step 2. Check for Voltage at the Connector for the Emergency Stop Switch
Disconnect the connectors for the emergency stop switch.
Turn the battery disconnect switch to the ON position.
Measure the voltage between terminal 5 on the harness side of the connector for the emergency stop switch and the engine ground stud.
Turn the battery disconnect switch to the OFF position. Expected Result:The correct voltage is 24 3 VDC.Results:
OK - The voltage is 24 3 VDC. The supply voltage is reaching the connector for the emergency stop switch. There may be a problem with the emergency stop switch. Proceed to Test Step 4.
Not OK - The voltage is not 24 3 VDC. The supply voltage is not reaching the connector for the emergency stop switch. There is a problem in the circuit between the emergency stop switch and the battery. Proceed to Test Step 3.Test Step 3. Check the Emergency Stop Switches
Disconnect the engine interface connectors.
Turn the battery disconnect switch to the ON position.
Measure the voltage between terminal 4 on the engine harness side of the engine interface connectors and the engine ground stud.
Turn the battery disconnect switch to the OFF position. Expected Result:The correct voltage is 24 3 VDC.Results:
OK - The voltage is 24 3 VDC.Repair: There is supply voltage at the engine interface connectors, but not at the connector for the emergency stop switch.There is a problem in the harness between the engine interface connectors and the connector for the emergency stop switch. The problem may be in a connector. Repair the harness and/or the connector. Replace parts, if necessary. Refer to Troubleshooting, "Inspecting Electrical Connectors".STOP
Not OK - The voltage is not 24 3 VDC.Repair: Supply voltage is not reaching the engine interface connector. There is a problem in the circuit from the battery to the engine interface connector. Ensure that the circuit breaker for the emergency stop switch is not tripped. Repair the harness and/or the connector. Replace parts, if necessary.Refer to Troubleshooting,