YOKE ASSEM. 8P5677 - Caterpillar

There are problems that could be reported with the Product Link system but the problems are not caused by the Product Link system. The problem can be described as the intervals between reports are erratic. This section contains steps that are used to determine the possible cause. Check for active diagnostic codes for the Product Link. Correct any diagnostic codes before proceeding. The following items should be visually inspected for damage: PL121SR radio, module, antenna and cables. Verify that there are no loose connections.The Product Link system depends on several communication links in order to transfer data from the machine to the office. The following procedures assume that these communication links are operating properly. The proper communication links are listed below:
The satellite network for VHF communications is operational in the geographic area of concern. The network is operational when messages can travel to the satellite and the messages can travel to the earth and Caterpillar.
The Product Link system is correctly configured to communicate on the network for VHF communications.
The worldwide network of Caterpillar's computers is passing messages to software for the Caterpillar Equipmentmanager (EM).
The Caterpillar Electronic Technician (Cat ET) is configured properly and the software is functioning.The PL300 module or the PL121SR radio should not be replaced without verifying that these issues have been investigated. Contact your Caterpillar Technical Communicator for aid in resolving these issues.Test Step 1. ACCESS THE PRODUCT LINK THROUGH THE CAT ET SERVICE TOOL.
Connect the Cat ET service tool to the machine.
Verify that the ECM (Product Link) is available. Expected Result:The ECM (Product Link) is available.Results:
OK - The ECM (Product Link) is available. Proceed to Test Step 2.
NOT OK - The ECM (Product Link) is not present in the screen for the Cat ET service tool. Repair: Verify that the wiring for the Product Link has been installed correctly. Check the wiring with a multimeter. If the ECM ( Product Link) is not available, refer to Systems Operation, Troubleshooting, Testing and Adjusting, "Electronic Service Tool Does Not Communicate with ECM".STOPTest Step 2. VERIFY THAT THE PRODUCT LINK HAS NOT BEEN TURNED OFF.
Select "Status Parameters" for Cat ET.
Verify that the " Possible Device Power Disconnection" is labeled as "No". Expected Result:"Possible Device Power Disconnection" is labeled as "No".Results:
OK - The "Possible Device Power Disconnection" is labeled as "No". The Product Link has operated since successfully transmitting the last report. Proceed to Test Step 3.
NOT OK - "Possible Device Power Disconnection" is labeled as "Yes". The Product Link has been disconnected from power and transmissions have been prevented. This could explain the failure to get any messages. Proceed to Test Step 3 in order to verify proper operation. Test Step 3. DETERMINE IF THE PRODUCT LINK SYSTEM HAS BEEN IN AN AREA OF BLOCKED COMMUNICATIONS.
Select "Status Parameters" for Cat ET.
Verify that the "Possible Periods of Communications Blockage" is "No". Expected Result:"Possible Periods of Communications Blockage" is "No".Results:
OK - The Product Link has seen satellites since the transmission of the last report. Verify that the machine has