FRAME AS-REAR 2257922 - Caterpillar

Note: If the red warning light has been activated do not perform a back pressure test. The catalyst section could begin to regenerate. This will damage the DPF.Caterpillar recommends recording when the DPF is cleaned. Refer to Table 3 in order to record the important information at each interval of cleaning. 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. Perform another back pressure test and record the results.Collection of Dust
A filter bag is required to collect the ash from the DPF. The filter bags are available from your Caterpillar dealer. The filter bag will trap particles as small as 5 microns. A filter bag can be used 5 to 10 times.
Disposal of filter bags must be in accordance with all applicable federal, state and local laws and regulations.
Cleaning Procedure
Follow the recommended procedure for cleaning the DPF.
Mark the inlet side of the catalyst section with a marker. Mark the outlet side of the catalyst section with a marker. Also mark the inlet and the outlet for the filter section. This is important because the sections need to be reinstalled in the correct direction.
Loosen the clamps that hold the filter section. Remove the filter section from the DPF. Inspect the outlet side of the filter section. The outlet side should be white in color. Replace the filter if there are black deposits on the outlet side. Also, inspect the sections for internal damage and external damage. If there is damage to a section, the section should be replaced.
Place a filter bag on the inlet side (dirty side) of the filter section. Secure the bag to the filter section by using one of the clamps from the DPF. Position the filter section in a vertical position. A holding fixture can be fabricated from the fabricated part number FT2931 . Positioning the filter section in this manner will allow the ash to fall into the bag. Refer to Illustration 8 in order to see the proper orientation.
Illustration 8 g01032990
Typical example (9) Outlet side (10) Rubber hose (3) Filter section (11) Inlet side (12) Filter bag
Use compressed air at 690 kPa (100 psi) to clean the filter. The air should be dry and free from oil. Place the air nozzle approximately 12.70 mm (0.5 inch) away from the filter section. By using slow circular motions, direct the compressed air through the filter section. Work from the center of the filter section toward the outside. Refer to table 2 for approximate times for cleaning.
Table 2
Diameter of Filter    Cleaning Duration    
143.764 mm (5.66 inch)     10 Minutes    
190.500 mm (7.5 inch)     15 Minutes    
228.600 mm (9.0 inch)     20 Minutes    
241.300 mm (9.5 inch)     25 Minutes    
266.700 mm (10.5 inch)     30 Minutes    
285.750 mm (11.25 inch)     35 Minutes    
304.800 mm (12.0 inch)     40 Minutes    
When you install the filter section