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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 46857021
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE
YEAR
PART NUMBER 4310-11-17
APPLICATION NOTES Doosan Bobcat
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-17 ( OEM Part Number 46857021 ). 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, 11"

OEM NUMBERS

Primary OEM46857021
Additional OEM46653362, 46679525, 46857021

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540927
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 equipment with confidence using the Doosan Bobcat Cummins DEF Head Unit (OEM 46854881 / Tamerx 4310-22-10) — a robust, remanufactured solution engineered for dependable performance. It delivers real-time precision in monitoring DEF level, temperature, and quality, integrating seamlessly with your SCR system to help prevent derates and keep your engine running clean. Built tough and backed by Tamerx’s 1-million mile / 1-year warranty, it’s the reliable emissions upgrade your fleet needs.

PEOPLE ALSO ASKS | BLOG(S)

When running heavy equipment powered by Cummins motors, every link in the emissions aftertreatment chain must hold up under pressure. One part that often slips under the radar until trouble strikes is the DEF (Diesel Exhaust Fluid) head unit. The Doosan Bobcat Cummins DEF Head Unit (OEM 46854881, Tamerx part 4310-22-2) handles critical sensing and control tasks—and when it fails, your SCR system, diagnostics, and downtime are all at risk.

  • Monitors DEF fluid level, temperature, and urea concentration, transmitting precise data to the machine’s ECU

  • Regulates accurate dosing of DEF into the exhaust stream to support the SCR system in reducing NOx

  • Manufactured to OEM 46854881 standards, ensuring proper fitment and calibration

  • Helps prevent system fault codes, warning lights, and engine derates caused by sensor drift or failure

  • Built to withstand the harsh conditions common in off-road use: vibration, temperature extremes, and corrosive DEF chemistry

  • Designed for easier replacement to limit machine downtime

Operating heavy machinery already pushes components to the limits. Don’t let a failing DEF head become your weak link. Installing a proper OEM-matched unit restores system accuracy, prevents surprise failures, and keeps your emissions system working consistently—even in demanding environments. Prioritize it in your maintenance schedule and keep your machines running clean and dependable.

The DEF (Diesel Exhaust Fluid) head unit plays an important role in monitoring fluid level, quality, and temperature within your vehicle’s emissions system. If it isn’t working correctly, you may see warning lights, fault codes, or even experience engine derates. Testing the DEF head unit helps confirm whether it’s operating properly or if it may need service or replacement.

Ways to Test a DEF Head Unit

  • Check Dashboard Indicators
    Look for DEF system or check engine warning lights, which may suggest the head unit isn’t sending accurate data.

  • Scan for Diagnostic Trouble Codes (DTCs)
    Use a diagnostic scanner to look for common DEF-related codes such as P203F, P205B, or P207F that point to head unit issues.

  • Compare DEF Readings
    Verify that the DEF level shown on the gauge matches the actual fluid in the tank. Inaccuracies may signal a faulty sensor.

  • Evaluate DEF Quality Alerts
    If the system repeatedly reports poor-quality DEF while using certified fluid, the head unit may be malfunctioning.

  • Inspect Sensor Response in Temperature Changes
    Confirm that the unit adjusts readings appropriately in hot or cold conditions. Unresponsive sensors may indicate failure.

  • Perform a Visual Inspection
    Check for crystallization, corrosion, or debris around the DEF head and connectors, as these can interfere with proper function.

Testing your DEF head unit involves both electronic checks—like scanning for codes—and physical inspections for visible issues. If you find repeated errors or inaccurate readings, it’s a sign the unit may be failing. Regular testing ensures your emissions system stays reliable, compliant, and avoids costly downtime.

It should be reviewed during regular service intervals, checking sensor readings, electrical connections, and cleanliness.

Cold may slow sensor response or risk freezing, and high heat may shift calibration or stress internal electronics.

Very sensitive—particles, crystallization, or chemical impurities can impair sensor output or clog internal paths.

The ECM may interpret the delay as a fault or low reading until the signals stabilize or the unit is reset.

Cummins DEF Head Units

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