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Terex Cummins ISL DEF Head Unit

TEREX CUMMINS ISL 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 NUMBER231064
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPEISL
YEAR
PART NUMBER4310-22-14
APPLICATION NOTESTerex
ADDITIONAL NOTESDEF Header, 40 MICRON, 22"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-22-14 ( OEM Part Number 231064 ). 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, 22"

OEM NUMBERS

Primary OEM231064
Additional OEM231064

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490541542
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.


Meet the Terex Cummins ISL DEF Head Unit — engineered to deliver rugged precision for your heavy-duty equipment. With real-time monitoring of DEF level, temperature, and quality, it ensures seamless integration with your SCR system and helps prevent costly derates. Built tough for extreme environments and backed by Tamerx’s trusted warranty, it's the dependable emissions upgrade your operation relies on.

PEOPLE ALSO ASKS | BLOG(S)

When your heavy equipment or machinery runs a Terex chassis with a Cummins ISL engine, emissions compliance isn’t optional—you need every link in the system working right. The Terex Cummins ISL DEF Head Unit (OEM 37346, Tamerx part 5410-11-FC01-3) is one of those links you can’t ignore. It’s the device that monitors your DEF fluid and controls how much urea gets injected into the exhaust. If it fails or gives bad readings, your SCR system can’t do its job—and your machine may suffer derates or error codes.

  • Detects DEF fluid level, temperature, and urea concentration and delivers that data to the engine control module

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

  • Built to the OEM 37346 spec for direct fit and calibration with Terex / Cummins ISL systems

  • Helps prevent fault codes, emissions warnings, or engine derates triggered by incorrect or drifting sensor data

  • Designed for durability: vibration resistance, thermal cycling endurance, and DEF-fluid compatibility

  • Field-friendly replacement minimizes downtime when you need to swap it out

Don’t wait for a warning light to let you know there’s a problem. Installing a reliable OEM 37346 Terex Cummins ISL DEF Head Unit ensures your emissions feedback loop stays accurate, your SCR system stays functional, and your machine stays compliant on every job. Treat this small component like a major system—it’s doing work you can’t afford to lose.

The DEF (Diesel Exhaust Fluid) head unit is designed to monitor DEF level, temperature, and quality, ensuring your vehicle’s emissions system stays compliant. But because it interacts with DEF fluid and contains sensitive sensors, changes in weather can have a noticeable effect on how the unit performs.

Ways Weather Can Affect the DEF Head Unit

  • Cold Temperatures
    DEF begins to freeze at around 12°F (-11°C). When frozen, sensors may give inaccurate readings until the fluid thaws.

  • Hot Conditions
    Excessive heat can cause DEF fluid to degrade and place extra stress on the head unit’s electronics, sometimes triggering false warnings.

  • Rapid Temperature Shifts
    Sudden swings from hot to cold can strain the sensors, increasing the risk of malfunctions or premature failure.

  • Crystallization Risks
    Freeze-thaw cycles encourage DEF crystallization, which can build up on sensors and block accurate readings.

  • Outdoor Storage Concerns
    Vehicles parked outside in extreme climates are more likely to experience temperature-related issues with the DEF head unit.

Yes—weather can absolutely affect how the DEF head unit works. Both hot and cold extremes can impact sensor accuracy and shorten the unit’s lifespan. By protecting vehicles from harsh conditions, using high-quality DEF, and performing routine inspections, operators can minimize weather-related issues and keep their systems running smoothly.

Depressurize the DEF system, disconnect wiring and sensors, unbolt the unit, and reseal it on reinstallation.

With clean DEF and regular checks, it can last several years, alongside the vehicle’s emissions system.

The fluid may freeze or flow too slowly, triggering error codes or derate.

Yes — excessive vibration or mechanical impact can damage sensors, loosen connections, or cause leaks.

Cummins DEF Head Units

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