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Doosan Bobcat Cummins DEF Head Unit

DOOSAN BOBCAT CUMMINS DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$895.00

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 NUMBER 46858813
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE
YEAR
PART NUMBER 4310-18-24
APPLICATION NOTES Doosan Bobcat
ADDITIONAL NOTES DEF Header, 40 MICRON, 18"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-18-24 ( OEM Part Number 46858813 ). This part is primarily made for a Cummins , 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 OEM46858813
Additional OEM46697828, 46858813

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490541221
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.


Take your emissions system to new heights with the Dennis Eagle Cummins DEF Head Unit — precision-crafted for seamless compatibility and reliable performance. This rugged, high-fidelity module provides real-time monitoring of DEF level, temperature, and quality to keep your SCR system operating smoothly and avoid engine derates. Built tough for demanding routes and heavy-duty use, it’s the dependable, compliant upgrade your rig craves.

PEOPLE ALSO ASKS | BLOG(S)

Whether it’s a loader, excavator, or other work machine, the DEF (Diesel Exhaust Fluid) system is essential for staying emissions-compliant. The Doosan Bobcat Cummins DEF Head Unit, built to OEM 46854881 specifications, acts as the “brain” for your DEF tank—monitoring fluid properties, controlling dosing, and supplying live data to the engine control module. When it starts to fail, warning codes, SCR faults, or engine derates can follow fast.

  • Measures DEF fluid level, temperature, and urea concentration to ensure the engine receives accurate inputs

  • Regulates the precise dosing of DEF into the exhaust stream so your SCR (Selective Catalytic Reduction) system can reduce NOx emissions properly

  • Drops in as a direct replacement for OEM 46854881, preserving calibration and compatibility

  • Helps avoid fault codes, emission system warnings, or derates triggered by sensor drift or failure

  • Built to endure the harsh environments your equipment faces—vibration, temperature swings, and DEF’s corrosive chemistry

  • Field-ready replacement design reduces downtime when you need to swap it out

In field operations, a failing DEF head unit often shows up as a sudden warning from the emissions or engine systems. But by then, it’s already impacted your machine’s reliability. Upgrading or replacing with the OEM 46854881 Doosan Bobcat Cummins DEF Head Unit restores sensor integrity, stabilizes your emissions circuit, and helps keep your equipment running clean and uninterrupted. Don’t ignore this component—treat it as essential maintenance rather than an afterthought.

The DEF (Diesel Exhaust Fluid) head unit plays a vital role in monitoring DEF level, quality, and temperature. When it begins to fail, the system may no longer provide accurate data to the engine control module (ECM). This can result in false warnings, reduced power, or even vehicle derates. Recognizing the early signs of failure can help you take action before the issue leads to costly downtime.

Signs of a Failing DEF Head Unit

  • Dashboard Warning Lights
    The check engine light or DEF system alerts may activate, signaling inaccurate or missing sensor data.

  • Frequent Fault Codes
    Codes like P203F, P205B, or P207F often point to level, temperature, or quality sensor problems.

  • Incorrect DEF Level Readings
    The system may show the tank as empty when it’s full, or display full when the fluid is actually low.

  • False DEF Quality Alerts
    Warnings about poor or contaminated DEF may appear even when using fresh, certified fluid.

  • Reduced Engine Power (Derate Mode)
    The ECM may limit power or speed if it cannot verify accurate DEF information.

  • Crystallization Around Sensors
    DEF crystal buildup may interfere with sensors, causing erratic behavior or false readings.

A failing DEF head unit can escalate quickly from small nuisance alerts to serious performance restrictions. By recognizing the warning signs early—such as inaccurate readings, repeated fault codes, or reduced engine power—you can address the problem before it results in costly repairs or downtime.

Use a diagnostic tool to compare commanded vs actual DEF flow, monitor sensor readings, and check for active fault codes.

First depressurize the DEF system, then carefully disconnect wiring harnesses, and unbolt the head unit following correct protocols.

It should be checked at regular maintenance intervals or whenever abnormal readings or codes appear.

Employ a controlled DEF system flush using manufacturer-approved cleaning fluid at low pressure to avoid damaging its internal sensors.

Cummins DEF Head Units

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