BEARING 8X8654 - Caterpillar

System Operation Description:The Intermediate Speed Switch is a normally open switch. When this switch is closed, the engine speed will decrease to the customer programmable intermediate idle speed. This intermediate speed is the speed rate of the PTO. This will happen regardless of PTO set speed or the desired speed for the throttle position sensor. When the intermediate speed switch is opened, the engine speed will be increased back to the desired engine speed for the throttle or the desired engine speed for PTO operation according to the ramp rate for the PTO speed. If the intermediate idle speed is programmed above the current desired engine speed for the throttle or the desired engine speed for PTO operation, this switch will have no effect on engine speed.
Illustration 1 g00751411
Test Step 1. Check the Electrical Connectors and the Wiring.
Turn the Battery switch for the ECM to the OFF position.
Turn the breaker at the battery to the OFF position.
Thoroughly inspect the ECM connectors J1/P1 and J2/P2. Inspect all of the other connectors. Refer to Troubleshooting, "Inspecting Electrical Connectors" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the circuit.
Check the ECM connector (allen head screw) for the proper torque of 6.0 N m (55 lb in).
Check the customer connector (allen head screw) for the proper torque of 2.25 0.25 N m (20 2 lb in).
Check the harness and the wiring for abrasion and pinch points.Expected Result:All connectors, pins, and sockets are completely coupled and/or inserted, and the harness and wiring should be free of corrosion, abrasion or pinch points.Results:
OK - The wiring and connectors are okay. Proceed to Test Step 2.
Not OK - Repair the wiring and connectors or replace the wiring or the connectors. Ensure that all of the seals are properly connected. Verify that the repair eliminates the problem.STOPTest Step 2. Check the Circuit of the Intermediate Speed Switch on the ET.
Install the ET to the service tool connector.
Turn the breaker at the battery to the ON position.
Turn the Battery switch for the ECM to the ON position.
Operate the intermediate speed switch. Observe the status for the intermediate speed switch on the ET.Expected Result:The status of the intermediate speed switch should read "ON" with the intermediate speed switch in the Closed position. The status of the intermediate speed should read "OFF" when the intermediate speed switch is in the Open position.Results:
OK - The circuit of the intermediate speed switch is operating normally.STOP
Not OK - The circuit of the intermediate speed switch is not operating normally. Proceed to Test Step 3.Test Step 3. Check the Intermediate Speed Switch.
Turn the Battery switch for the ECM to the OFF position.
Turn the intermediate speed