Regular maintenance of the DPF is crucial to prevent costly repairs and keep your fleet operating at peak efficiency. Most truck manufacturers recommend cleaning the filter every 150,000 to 300,000 miles. These numbers are generally overly optimistic and presume ideal operating conditions. The actual cleaning interval of DPFs can vary greatly depending on the driving conditions and the type of diesel fuel used. 

Based on years of cleaning thousands of DPFs in our own shops, Filtertherm recommends servicing your DPFs at least once a year or 1,000 engine hours for high idle applications. Removing the ash regularly will help extend the life and performance of your fleet’s aftertreatment systems and engines. If hardened ash builds up in the DPF, it restricts the flow and often causes unnecessary engine issues or even filter failure.

Ultimately, the real-world driving conditions of each vehicle are the crucial factor when determining DPF cleaning for fleet maintenance schedules. Expect that trucks operating in stop-and-go traffic or high idling situations will need DPF cleanings at closer intervals.

Early detection of DPF damage is vital to avoid expensive repairs or replacements. Here are some signs that often indicate a damaged DPF:

• Excessive Soot or Ash Accumulation: During regular inspections, look for excessive soot or ash accumulation in the DPF. A severely clogged filter may be damaged and require replacement.
• Aftertreatment Codes: Train your drivers to not ignore dash light warnings.
• Engine Performance Issues: A damaged DPF can lead to reduced engine performance, including decreased power output, rough idling, and increased exhaust smoke.
• Failed Regeneration Cycles: If your trucks’ DPF fails to complete regeneration cycles successfully, it could be an indication of damage or excessive clogging.
• Unusual Noises: Uncommon rattling or knocking sounds from the DPF area could signal internal damage or loose components.

If you suspect a damaged DPF, it’s crucial to inspect the filter promptly.

Have your technicians follow these inspection procedures whenever a DPF comes off a truck for cleaning or otherwise.

• Visual Inspection: Look for cracks, holes, or other damage to the filter brick.
• Wire/Pin Test: Perform a wire/pin test before and after cleaning. If the DPF has hardened areas after cleaning, it may need additional cleanings or replacement if the ash is too compacted.
• Heat Damage? Check the DPF for signs of extreme heat damage such as scorching or melting. If the DPF has experienced an extreme heat event, it is likely damaged beyond repair.
• Dirty Outlet? Check the outlet side of the DPF for soot. This indicates DPF is compromised and should be replaced.
• Fluids Present? See if there are any engine fluids such as oil, fuel, or coolant on the filter.

When a DPF reaches the end of its service life or is irreparably damaged, proper disposal is critical to ensure environmental responsibility. DPFs contain hazardous materials, so they should not be thrown away in the trash/regular recycling. Follow these steps to dispose of damaged DPFs responsibly:

• Compliance with Local Regulations: Ensure that you comply with all local, state, and federal regulations regarding the disposal of hazardous waste. DPFs are considered hazardous due to the presence of heavy metals.
• Engage Authorized Recyclers: Contact authorized DPF recycling facilities that can safely handle and process damaged filters. These facilities can extract valuable metals and dispose of the remaining components responsibly.
• Document Disposal: Keep detailed records of the disposal process, including the date, disposal facility information, and any relevant paperwork, as part of your fleet’s environmental compliance efforts.

We recommend contacting Red Fox Resources and asking about a Fox Box or their other flexible recycling options. They will even pay you for your accumulated, unusable DPFs, and DOCs.

Red Fox Resources handles all the logistics of shipping parts from your location to their facility. They arrange for truckload, LTL, or express shipments. They even pay shipping costs for collection partners.

Contact Red Fox Resources for more information.