| |
| Illustration 1 | g03689775 |
Cleaning the Diesel Particulate Filter (DPF)
| Record of DPF Cleaning | ||||||||
| Customer Name _______________
Initial Install Date _______________ Machine Model _______________ Machine Serial Number _______________ Machine Fleet Number _______________ EIN _______________ Filter Serial Number _______________ Filter Part Number _______________ Catalyst Module Number _______________ Catalyst Part Number _______________ Initial Engine Hours _______________ Initial Back Pressure at a Full Throttle, No-Load condition (Specify Units) _______________ |
||||||||
| Cleaning Date | ||||||||
| Engine Hours | ||||||||
| Pre-Bake Weight (kg/lbs) | ||||||||
| Post-Bake Weigh (kg/lbs) | ||||||||
| Weight After Pulsed Air (kg/lbs) | ||||||||
| Pre-Clean Back Pressure (Specify Units) | ||||||||
| Post-Clean Backpressure (Specify Units) | ||||||||
| Cleaning Entity | ||||||||
| Name/Initials of Technician | ||||||||
Note: Check State and Local air pollution regulations pertaining to record keeping of serviced filters. Some governmental entities may require filter tracking.
Note: Perform a back pressure test prior to cleaning the DPF and record the results. After cleaning the DPF, run the engine at high idle for 5 to 15 minutes to bring the engine and exhaust system to operating temperature. Perform another back pressure test and record the results on the DPF cleaning records form.
- Weigh and record the filter unit prior to baking.
- By baking the filter under a controlled procedure, the remaining soot on the DPF will burn off and leave a smaller quantity of ash . Failure to observe this procedure can result to damage or cracking to the DPF substrate. A commercial programmable oven is required for this procedure. Careful adherence to this procedure is imperative. Deviation from this procedure may lead to thermal shock and cracking of the DPF substrate or melting at high temperatures.
- Place filter into a programmable commercial oven designed for this purpose. Center the filter as much as possible on a rack with 2 inches of spacing below and above for best results.
- Program the oven as follows:
- Ramp oven temperature to
200° C (392° F) - Hold oven temperature at
200° C (392° F) - Ramp oven temperature to
450° C (842° F) - Hold oven temperature at
450° C (842° F) - Cool down to ambient temperature at natural rate within the oven with the doors closed. Do not use fans.
- Place filter in cleaning machine and clean as per machine instructions.
- Replace the filter in the oven. Ramp to
650° C (1202° F) in 60 minutes. - Hold oven temperature at
650° C (1202° F) for 240 minutes. - Cool to ambient temperature at a natural rate. Do not use fans.
Note: Allow the filter to cool in the oven with the door closed until the filter can be handled with bare hands.
- Ramp oven temperature to
Consult your Cat dealer for DPF cleaning and replace option.
Note: Other cleaning methods can release significant quantities of airborne ash and soot. Airborne ash and soot should not be inhaled and may be regulated as a hazardous substance by local regulations.
The following steps determine if the DPF was properly cleaned:
Note: This specification applies to filters that were cleaned of ash only. This specification is only valid subsequent to the recommend cleaning procedure. This specification should not be used to determine if soot filled filters are properly cleaned. All filters must be baked appropriately using the recommended cleaning procedure prior to application of this specification.
- Inspect both inlet and outlet surfaces for oil/fuel contamination, gouges and/or cracks. No cracks may be visible. Gouges may not exceed
4.0 mm (0.15 inch) deep. - There must be no filter movement within the filter banding. This movement is defined as the substrate moving past the bent-over flange. The filter must be even or below the bent-over flange.
- The flanges are not damaged beyond repair.
- There are no dents deeper than
6.4 mm (0.25 inch) in the outer can of the filter and the outer can is not cracked, torn, or otherwise breached. - No more than 20 cells are allowed to be damaged (showing soot) on the outlet face of the filter.
- Inspect the ash depth in the cells using the "Check Cell Depth" instructions.
- Check cell depth by dropping the stainless steel probe into a cell location noted by a dot in the illustration to the right.
- Lightly tap the probe with a finger until the probe does not travel into the cell any further. Mark the probe to record the depth.
- Measure the distance from the tip of the probe which entered the cell to the mark made on the probe. This distance is the cell depth. Repeat this step 17 times. Refer to illustration 2.
| |
| Illustration 2 | g03816457 |
Evaluation of a Filter with Hardened Ash
Refer to illustration 3 below for the evaluation.
| |
| Illustration 3 | g03816464 |
- Identify the one or two cells (1) where heavy resistance was noted during the cell depth check.
- Draw a
50.8 mm (2 inch) square (2) around cell (1). - Check cell depth at the eight dot locations (3).
- If the probe encounters heavy resistance in three or more cells, THE FILTER IS NOT CONSIDERED CLEAN. THE FILTER MUST NOT RETURN TO SERVICE UNTIL THE FILTER IS PROPERLY CLEANED
| |
| Illustration 4 | g03816523 |