DISC 2M8912 - Caterpillar

Truck EngineC13 (S/N: LEE1-UP)C15 (S/N: SDP1-UP; B5R1-UP)Reference: Special Instruction, REHS3818, "Procedure to Relocate the Inlet Hose for the ARD Purge Air Pump" for more information.Reference: Special Instruction, REHS4833, "Procedure to Install the In-line Check Valve in the Inlet Hose to the Air Compressor" for more information.The new 20R-5604 Air Compressor Gp and 20R-5605 Air Compressor Gp are direct replacement for 10R-9392 Air Compressor Gp and 10R-9393 Air Compressor Gp respectively no longer have an integrated inlet check valve in the head of the air compressors.Note: Only applications with an ARD pump still installed in the system will be impacted by the change.Refer to Illustration 1 to confirm the presence of ARD pump in the machine.The application still using an ARD pump will have to make some lines changes prior to installation of the new 20R-5604 Air Compressor Gp or 20R-5605 Air Compressor Gp to avoid the ingestion of oil into the purge system, since no check value present in the new compressors.
Illustration 1 g06036646
Location of ARD Pump (Left Side View of Engine)