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REV PARTS LLC Cummins ISL DEF Head Unit

REV PARTS LLC CUMMINS ISL DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$1,295.00

CORE CHARGE:

$250.00
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 NUMBER10344986
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR
PART NUMBER5410-18-FC01-4
APPLICATION NOTESREV PARTS LLC
ADDITIONAL NOTESDEF Header, 40 MICRON, 18"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 5410-18-FC01-4 ( OEM Part Number 10344986 ). This part is primarily made for a Cummins ISL, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here

Additional Notes: DEF Header, 40 MICRON, 18"

OEM NUMBERS

Primary OEM10344986
Additional OEM10344986

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540521
WEIGHT8.00 LBS

SHIPPING OPTIONS

Ship Weight : 8.00 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.


Power your emissions control with the REV PARTS LLC Cummins ISL DEF Head Unit — engineered for accuracy, durability, and seamless compatibility with Cummins ISL systems. This high-performance unit monitors DEF level, temperature, and quality in real time, helping to avoid engine derates and ensure compliance mile after mile. Rugged and reliable, it fits right into your SCR setup for a smoother, cleaner ride you can trust.

PEOPLE ALSO ASKS | BLOG(S)

If you operate a REV PARTS LLC vehicle powered by the Cummins ISL engine, maintaining emission compliance is nonnegotiable—and the heart of that responsibility lies in a reliable DEF head. The REV PARTS LLC Cummins ISL DEF Head Unit, OEM 10344986, is engineered to deliver accuracy, durability, and seamless integration with your on-road system. Whenever this unit malfunctions—or drifts out of calibration—you risk error codes, SCR failures, or engine derates that disrupt daily operations.

  • Continuously monitors DEF level, temperature, and urea concentration, supplying real-time data to the engine control module

  • Enables precise DEF dosing into the exhaust stream, helping the Selective Catalytic Reduction (SCR) system reduce NOx effectively

  • Built to OEM 10344986 specifications, ensuring plug-in compatibility for REV PARTS LLC Cummins ISL applications

  • Helps prevent fault codes, emissions warnings, or derates by avoiding misreadings or sensor drift

  • Constructed to resist thermal stress, vibration, and exposure to corrosive DEF chemicals

  • Designed for efficient replacement in the field, minimizing downtime

Don’t let a failing DEF head compromise your emissions system or force unexpected maintenance stops. By installing the OEM 10344986 unit, you restore the integrity of your DEF circuit, protect against derates, and keep your vehicle emissions-ready. For operators relying on REV PARTS LLC Cummins ISL platforms, this DEF head is a small investment that yields dependable performance and peace of mind.

When a DEF (Diesel Exhaust Fluid) head unit fails, it can trigger warning lights, diagnostic trouble codes (DTCs), and even lead to vehicle derates. Replacing the head unit is often the only reliable solution. For operators, one of the biggest concerns is how much downtime this repair will require. Fortunately, the process is typically straightforward and doesn’t take as long as some major engine repairs.

Factors That Affect Replacement Time

  • Average Timeframe
    In most cases, replacing a DEF head unit takes 1 to 3 hours, depending on the vehicle model and system design.

  • Accessibility of the DEF Tank
    If the DEF tank is easy to reach, the process is faster. In some vehicles with limited space, extra time may be needed for disassembly.

  • Experience of the Technician
    A skilled technician familiar with the system can complete the replacement more quickly than someone new to DEF repairs.

  • Condition of the System
    Corroded wiring, crystallization build-up, or other related issues may extend the repair time.

  • Calibration or Reset Needs
    After installation, some vehicles may require ECM resets or system checks, which can add to the overall time.

Replacing a DEF head unit is not usually an all-day job. With proper tools and expertise, it can often be completed in just a few hours, minimizing downtime and getting your vehicle back on the road quickly. Staying proactive with DEF system maintenance can also help ensure smoother replacements when needed.

 

Flush it gently with certified DEF, avoid solvents or abrasives, and carefully clean around the sensor ports without scratching surfaces.

Drain the DEF, disconnect wiring and fluid lines, remove the old head, install the new unit, prime, and run calibration diagnostics.

The engine may derate, emit faults or fail to meet emissions limits, or even shut down in some systems.

It should be inspected and tested at every regular service interval, paying special attention to sensor readings, seals, and connections.

Cummins DEF Head Units

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