PUMP & MTG GP-MAIN HYDRAULIC 2597953 - Caterpillar

The ignition system may cause an electrical shock hazard, which may cause personal injury or death. Avoid contacting the ignition system components and the ignition system wiring during operation.
Use the electronic service tool to perform an ARD ignition test.Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, use the electronic service tool to perform a Manual DPF Regeneration.
Confirm that the fault has been eliminated.
If the fault is still present, install a replacement spark plug. Refer to Specifications, "Electronic Control Wiring Group (ARD)" for the correct torque value.
Use the electronic service tool to perform an ARD ignition test.Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, use the electronic service tool to perform a Manual DPF Regeneration.
Confirm that the fault has been eliminated. If the fault is still present, install the original spark plug. Proceed to Test Step 6.
Result 2: The spark plug is damaged. - Repair: Perform the following procedure:
Install a replacement spark plug. Refer to Specifications, "Electronic Control Wiring Group (ARD)" for the correct torque value.
Use the electronic service tool to perform an ARD ignition test.Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, use the electronic service tool to perform a Manual DPF Regeneration.
Confirm that the fault has been eliminated. If the fault is still present, proceed to Test Step 6.Test Step 6. Check the ARD Air SystemUse the electronic service tool to perform the ARD Air System Service Test.Results:
The ARD Air System Service Test is successful. - Proceed to Test Step 7
The ARD Air System Service Test is failed. - Repair: Investigate the cause of the test failure. Refer to Troubleshooting, "ARD Combustion Supply Air Pressure Is Low".STOPTest Step 7. Replace the ARD Filter Connector in the ARD Combustion Head
Illustration 5 g02931757
ARD Combustion Head (11) ARD pilot filter connector
Replace pilot filter connector (11) in the ARD combustion head. Refer to Illustration 5.
Clear all diagnostic codes.
The ignition system may cause an electrical shock hazard, which may cause personal injury or death. Avoid contacting the ignition system components and the ignition system wiring during operation.
Use the electronic service tool in order to perform the "ARD Ignition Test".Note: The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, use the electronic service tool to perform a Manual DPF Regeneration.Results:
The ARD ignition test was successful and no codes were logged. - Return the unit to service.STOP
The ARD ignition test was not successful and codes were logged. - Proceed to Test Step 8.Test Step 8. Inspect ARD Swirl Plate
Illustration 6 g02865416
(12) Swirl plate slots
Remove the ARD head. Refer to Disassembly and Assembly, "Combustion Head Group (ARD) - Remove and Install - Clean Emissions Module" for the proper procedure to remove the ARD combustion head.Note: