105932-1280 ZEXEL 9 420 611 846 BOSCH GOVERNOR 9420611846 1059321280 1157708480

Introduction
The following procedure identifies the proper steps in identifying and recording a serial number of a DPF. There is also an inspection process that should be followed in order to help determine if an open Service Letter for the DPF applies to that particular unit.
Hot engine components can cause injury from burns. Before performing maintenance on the engine, allow the engine and the components to cool.
Wear goggles, gloves, protective clothing, and a National Institute for Occupational Safety and Health (NIOSH) approved P95 or N95 half-face respirator when handling a used Diesel Particulate Filter or Catalytic Converter Muffler. Failure to do so could result in personal injury.
Inspection Process that is Used in order to Obtain the Serial Number of the DPF
The serial number of the DPF contains 14 characters and the serial number is engraved onto the center section of the DPF.
Illustration 1 g01675205
Breakdown of the serial number of a DPF (1) Filter size number (256, 325, 519, 556, 653, 740, or 456) (2) Filter size letter (A or C) (3) Julian date (five numbers, first two will be 06, 07 or 08) (4) Assembly identification code (A or B) (5) Filter can number (four numbers)Note: Some older diesel particulate filters do not have the same sequence of characters and the filters may only contain 13 total characters. If 13 total characters are present the character for the size of the filter (fourth character from left) is missing.
The serial number of the DPF is located at the six o'clock position (pointing toward the ground on horizontally mounted diesel particulate filters) when the DPF is installed on the chassis of a vehicle. In the six o'clock position, the serial number of the DPF can be read. The following images show examples of an engraved serial number on the center section of the DPF.
Illustration 2 g01673033
(6) Location of the serial number on the center section of the DPF
Illustration 3 g01673054
(7) Location of the serial number on the center section of the DPFNote: Dual diesel particulate filters will have two different serial numbers. The serial numbers will be engraved on each center section.
Illustration 4 g01673094
Label from the factory on a DPF
Diesel particulate filters with low mileage may contain a label with information on the label. The label should be ignored. The label is only for the factory assembly, and the label will burn off in time.
Illustration 5 g01673200
(8) Enter the full serial number of the DPF in the section that is for comments.
Once the serial number of the DPF is found, write down the information. Connect to Caterpillar Electronic Technician (ET) and submit a warranty report. Type the serial number of the DPF in the section for comments. Refer to Illustration 5 for the location of the section for comments. Also, be sure to complete all the fields before submitting the download.
Illustration 6 g01678935
(9) Inputting the serial numbers for dual diesel particulate filters
If you are entering serial numbers for dual diesel particulate filters, add a semicolon between the serial numbers. Procedure for Inspecting the Sensor Assembly on Diesel