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Cummins QSL 8.9L DOC/DPF 2014-2024: OEM 5306728

CUMMINS QSL 8.9L DOC/DPF 2014-2024: OEM 5306728

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$8,995.00

CORE CHARGE:

$1,000.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER5306728
PART TYPEDOC/DPF
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEQSL 8.9L
YEAR2014-2024
PART NUMBER5306728RM-ASM
APPLICATION NOTESTier 4

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx DOC/DPF, Tamerx part number 5306728RM-ASM ( OEM Part Number 5306728 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a Cummins QSL 8.9L, production years 2014-2024, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5306728
Additional OEM5306728, 5307403, A043A487, A043D681

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490554276
WEIGHT71.00 LBS

SHIPPING OPTIONS

Ship Weight : 71.00 LBS
UPS Ground, 2nd Day Air, Next Day Air

SHIPPING POLICY

Tamerx Diesel Products ships via UPS Ground. Next day air shipping can be arranged for a reasonable price of anywhere from $50.00 - $100.00 depending on the weight of the product and your location. We will do everything we can to make sure that you get the service you need. We understand how important it is to receive your order as quickly as possible.
In most cases Tamerx Diesel Products only needs one address, as long as your product is shipping to the same location as your billing information. In order to eliminate credit card fraud, your billing information must match the credit card you provide.

The terms, conditions, and details of our warranty vary from product to product. Specific warranty details can be found below.

Tamerx Diesel Products provides a replacement warranty on all of our parts. The duration and mileage limitations of the warranty vary by product and are specified on the product's detail page/item listing.

Please note that the warranty covers replacement of the part and the cost of shipping the replacement part to you only. It does not cover any shop, labor, towing, or any similar or related costs. This is not a "money back guarantee".

If you experience a problem with your part or it is not functioning properly, the correct warranty procedure is to call us at (510) 257-1777 (8:00 AM - 5:00 PM ET Monday through Friday). Be sure to have your order number and/or other relevant order information ready so we can easily locate your order and resolve your issue as quickly as possible. From that point, we will review with you any troubleshooting steps that may need to be taken and other areas or systems that can be checked to rule out external problems contributing to your part's issue. If a replacement is determined to be necessary, we will then arrange for your replacement part to ship out ASAP and issue any necessary return shipping labels and/or documents.

As is the case for the majority of the diesel products sold on Tamerx Diesel Products, your part's warranty is active as soon as you install it. In some other cases, warranty activation is contingent upon you sending us your core (i.e., your old part). Tamerx Diesel Products will provide you a return shipping label for parts that have a warranty with a core return condition. When we have received your core return, the part's warranty coverage begins. We reserve the right to void the product warranty if your core is not received within the allotted time, or if it isn't received at all. If the warranty for the diesel part you are purchasing has a core return requirement, it will be clearly noted on the product detail page/item listing.

What is a Core Charge?

A core charge (also called "core deposit") is similar to the deposit you might pay for a can or bottle of soda and is a standard requirement in the auto parts industry. For example, in many states, to promote recycling, you pay a deposit when you purchase a can of soda and receive your deposit back when you return the empty can. Many automotive parts have a core charge, or core price, that works in essentially the same way as a soda can deposit.

30 Day Core Charge Hold

You authorize Tamerx Diesel Products, to hold your credit card for the specified core charge amount and that you agree to return your core with 30 days of receiving the purchased part. When we have received your core return, the hold is released and the core charge payment is canceled.

The customer, or parts buyer, is responsible for any shipping costs associated with core returns unless otherwise specified in the product listing/detail page. Tamerx Diesel Products offers prepaid UPS shipping labels (SKU numbers UPS-CR1 and UPS-CR2) for use in returning your core that are available for purchase on our website during your shopping/order process.

The shipping label you will need to use for the core return is dependent upon what part you are purchasing. UPS-CR1 is good for cores weighing up to 20 pounds. UPS-CR2 is appropriate for shipping cores weighing 21 pounds or more. You must include enough information with the core return that clearly identifies it as a.) a Core Return, and b.) contains enough information we can use to clearly associate the core return with your order. Including a copy of the invoice or packing slip that came with the original shipment, clearly marked "Core Return", is ideal. Alternately, you can include a note marked as "Core Return" that includes your order number, full name and address, and phone number or other contact information. Failure to include this information with your returned core will most likely delay any due core credit being issued and/or delay any applicable warranty activation. Core returns need to be for the exact part purchased and cannot be damaged. Substituting another part in place of the part you have purchased is not acceptable.

All fluids must be drained.

If you have purchased a set or a parts package, you will need to return cores for all components of the set. For example, if you have purchaed a high pressure oil pump with an IPR valve, you will need to return both HPOP and IPR valve cores to receive proper credit. If you have purchased an EGR cooler/EGR valve package, your core return must consist of an EGR cooler core and an EGR valve core, or core credit will not be given.

Core Charges are often mandated by state legislature, and, as such, the actual core charge and taxes on the charge may vary depending on the state in which you buy your part. The Tamerx Diesel Products core charge presented to you online today with your item is representative of the most common core charge.


Engineered for integrated exhaust treatment, the Cummins QSL 8.9L DOC/DPF 2014–2024 (OEM 5306728) handles both oxidation and particulate filtration within a single assembly. Designed for Cummins QSL 8.9L engines, this component helps manage emissions as exhaust flows through each stage of the system. Manufactured to OEM specifications, it ensures proper fitment and reliable compatibility across the listed model years. Using the correct DOC/DPF unit helps support consistent emissions system function and long-term reliability.

FITMENT CHART

YEARMAKEENGINE(S)
2014Cummins QSL 8.9L
2015Cummins QSL 8.9L
2016Cummins QSL 8.9L
2017Cummins QSL 8.9L
2018Cummins QSL 8.9L
2019Cummins QSL 8.9L
2020Cummins QSL 8.9L
2021Cummins QSL 8.9L
2022Cummins QSL 8.9L
2023Cummins QSL 8.9L
2024Cummins QSL 8.9L

PEOPLE ALSO ASKS | BLOG(S)

When it comes to diesel emissions control, having both filtration and catalytic treatment working together is essential. The DOC/DPF assembly combines two critical components into one unit—handling both harmful gases and soot particles in a single system. In Cummins QSL 8.9L engines, this setup helps streamline exhaust treatment while supporting efficient and consistent emissions control across demanding applications.

  • Dual-Function Design for Complete Emissions Control
    This assembly integrates a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF), allowing it to both convert harmful gases and capture soot particles in one system.
  • Breaks Down Gases Before Filtration Begins
    The DOC section converts carbon monoxide and hydrocarbons into less harmful substances, preparing the exhaust before it reaches the filtration stage.
  • Captures and Stores Soot Particles
    The DPF portion traps particulate matter within a ceramic structure, preventing soot from being released into the environment.
  • Supports Regeneration for Continuous Operation
    As soot builds up, the system initiates regeneration to burn off accumulated particles, helping maintain proper exhaust flow and filter efficiency.
  • Designed for Cummins QSL 8.9L Engines (2014–2024)
    Built to OEM 5306728 specifications, this DOC/DPF assembly is engineered to integrate with the factory aftertreatment system for proper fitment and reliable operation.

The DOC/DPF assembly is a powerful combination that handles multiple stages of emissions control in one unit. For Cummins QSL 8.9L engines, this component helps ensure cleaner exhaust, supports system efficiency, and keeps the aftertreatment process running smoothly throughout daily operation.

 

The Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF) work together to reduce harmful emissions and manage soot in modern diesel engines. The DOC helps oxidize gases, while the DPF captures and burns off soot through regeneration. When either component becomes blocked or fails, it can affect engine performance, increase emissions, and trigger warning lights. Several factors can contribute to DOC/DPF issues.

  • Excessive soot buildup is one of the most common causes, often due to frequent short trips or interrupted regeneration cycles.
  • Faulty fuel injectors or poor combustion can increase unburned fuel and soot entering the exhaust system.
  • Oil or coolant contamination can coat internal surfaces, reducing efficiency and causing permanent damage.
  • Low exhaust temperatures from excessive idling or light-duty operation may prevent proper regeneration.
  • Poor fuel quality can introduce contaminants that contribute to buildup inside the DOC and DPF.
  • Malfunctioning sensors, such as temperature or differential pressure sensors, can disrupt proper regeneration timing.
  • Ignoring warning lights or delaying maintenance can allow minor restrictions to develop into full blockages.

When the DOC or DPF becomes restricted, it can lead to increased backpressure, reduced engine power, and possible derate conditions. Regular maintenance, proper driving habits, and prompt attention to warning signs are essential to prevent blockage and ensure reliable aftertreatment system performance.

Yes, excessive soot or ash buildup can restrict flow and reduce efficiency.

Signs may include reduced performance, warning lights, or increased exhaust pressure.

Yes, heat is required for both oxidation and regeneration processes.

Yes, oil or fuel contamination can reduce performance and shorten its lifespan.

Cummins DOC/DPFs

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