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Cummins L9 SCR 2018-2021: OEM 5418518

CUMMINS L9 SCR 2018-2021: OEM 5418518

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$4,995.00

AVAILABILITY IN STOCK
OEM NUMBER5418518
PART TYPESCR
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEL9
YEAR2018-2021
PART NUMBER5418518RM-SCR
APPLICATION NOTESLink-Belt, 250-320, EPA17

PRODUCT DESCRIPTION

This is a Remanufactured Tamerx SCR, Tamerx part number 5418518RM-SCR ( OEM Part Number 5418518 ). 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 L9, production years 2018-2021, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

OEM NUMBERS

Primary OEM5418518
Additional OEM5418518

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490550759
WEIGHT75.00 LBS

SHIPPING OPTIONS

Ship Weight : 75.00 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 compatibility with 2018–2021 Cummins L9 engines, the Cummins L9 SCR (OEM 5418518) is a key component of the diesel exhaust aftertreatment system. This Selective Catalytic Reduction (SCR) unit works with diesel exhaust fluid (DEF) to convert nitrogen oxides in the exhaust stream into less harmful gases before they exit the vehicle. Manufactured to meet original equipment specifications, it is designed for proper fitment and dependable integration with the existing emissions system. The durable construction is built to withstand the high temperatures and demanding operating conditions commonly found in heavy-duty diesel applications. Replacing a worn or restricted SCR unit with the OEM 5418518 helps maintain proper exhaust aftertreatment operation and supports compliance with emissions regulations.

FITMENT CHART

YEARMAKEENGINE(S)
2018Cummins L9
2019Cummins L9
2020Cummins L9
2021Cummins L9

PEOPLE ALSO ASKS | BLOG(S)

The Cummins L9 SCR (Selective Catalytic Reduction) system, OEM 5418518, is a vital component within the emissions control system used in many Cummins L9 engines produced between 2018 and 2021. Its main role is to reduce nitrogen oxide (NOx) emissions generated during the diesel combustion process, helping vehicles meet strict environmental regulations.

The SCR system operates as part of the exhaust aftertreatment assembly. After exhaust gases pass through earlier components such as the Diesel Oxidation Catalyst (DOC) and Diesel Particulate Filter (DPF), the SCR system performs the final stage of emissions treatment.

Main Roles of the Cummins L9 SCR 5418518

  • Reduces nitrogen oxide (NOx) emissions f
    • rom diesel exhaust
  • Uses diesel exhaust fluid (DEF)
    • to enable chemical reactions inside the catalyst
  • Converts NOx into nitrogen and water vapor,
    • which are less harmful to the environment
  • Supports compliance with emissions regulations
    • for heavy-duty diesel engines
  • Works with other aftertreatment components
    • to complete the exhaust treatment process

The SCR system injects DEF into the exhaust stream, where it reacts with NOx gases inside the catalyst. This reaction transforms harmful emissions into safer compounds before the exhaust exits the vehicle.

For vehicles equipped with Cummins L9 engines from 2018 to 2021, the OEM 5418518 SCR unit plays an essential role in maintaining effective emissions control and ensuring the aftertreatment system operates as designed.

A Selective Catalytic Reduction (SCR) system is designed to reduce nitrogen oxide emissions in diesel vehicles. It works by injecting diesel exhaust fluid (DEF) into the exhaust stream, where it reacts with exhaust gases inside the SCR catalyst. When the system fails, it can lead to warning lights, emissions faults, and possible restrictions on vehicle operation.

The most common cause of SCR failure is contamination within the catalyst or DEF system. When impurities enter the system, they can interfere with the chemical reactions needed to reduce emissions effectively.

Several issues can lead to SCR failure, including:

  • Contaminated or poor-quality DEF
    • that leaves deposits in the system
  • DEF crystallization
    • caused by improper dosing or storage conditions
  • Faulty sensors
    • that send incorrect emissions readings
  • DEF injector problems
    • that prevent proper fluid distribution
  • Excessive soot or residue
    • entering the exhaust system

Driving conditions and maintenance habits can also affect the SCR system. Ignoring warning lights or delaying maintenance may allow small problems to grow into larger failures within the emissions system.

Regular inspections, proper DEF handling, and quick attention to diagnostic codes can help prevent contamination and extend the lifespan of SCR components. Addressing engine or emissions issues early is one of the best ways to avoid SCR system failure.

Part number 5418518 belongs to the selective catalytic reduction stage of a diesel aftertreatment system.

Medium-duty and heavy-duty trucks powered by compatible Cummins L9 engines may use this SCR catalyst.

The module contains a catalyst-coated structure that promotes chemical reactions within the exhaust flow.

NOx sensors and temperature sensors measure exhaust conditions before and after the SCR catalyst.

Cummins SCRs