Wausau Equipment Cummins ISB 6.7L DEF Head Unit
WAUSAU EQUIPMENT CUMMINS ISB 6.7L DEF HEAD UNIT
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-18-20 ( OEM Part Number SV10306 ). This part is primarily made for a Cummins ISB 6.7L, 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 OEM | SV10306 |
| Additional OEM | SV10306 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540613 |
| WEIGHT | 8.00 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.
Keep your emissions system operating smoothly with the Wausau Equipment Cummins ISB 6.7L DEF Head Unit (OEM SV10306). This genuine OEM component is designed to accurately monitor and manage diesel exhaust fluid levels, temperature, and quality for optimal system function. Built to meet Cummins and Wausau Equipment specifications, it ensures reliable communication with the engine’s aftertreatment system for proper DEF delivery and emissions control. The durable construction provides dependable operation even under harsh working conditions, helping prevent system faults and downtime. Rely on Tamerx Diesel Products LLC for authentic replacement parts that offer consistent quality, precision, and long-lasting reliability.
PEOPLE ALSO ASKS | BLOG(S)
Here’s a breakdown of the components and functions of the Wausau Equipment / Cummins ISB 6.7L DEF Head Unit (OEM SV10306) that you asked about:
Key Components
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Sensor head assembly – The primary module (often called the “head unit” or “sensor head”) for the DEF system. It is listed under part number OEM SV10306.
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Fluid level sensor – Built into the head unit. Monitors the amount of Diesel Exhaust Fluid (DEF) in the tank.
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Temperature sensor – Monitors DEF temperature (important especially in cold climates for freeze-thaw protection).
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Quality / concentration sensor – Some head units integrate a sensor to check DEF concentration or quality (urea strength, contamination) so the SCR system can function properly.
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Fluid fittings / plumbing interfaces – The head unit includes mounting ports for suction, return and sometimes coolant or heating lines (to manage fluid temperature) as noted in the description of SV10306.
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Electrical connector – A standard connector interface (e.g., Deutsch DT4 in the SV10306 spec) for the vehicle’s wiring harness to send sensor data to the engine control module (ECM) or after-treatment controller.
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Internal filtration / strainer – The DEF head unit may contain an in-tank filter or strainer to prevent debris from entering the dosing system.
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Heating circuit or coolant interface – Depending on the application, the head unit may integrate or interface with a heating element or coolant loop to keep DEF from freezing and maintain correct fluid temperature.
In essence, the OEM SV10306 head unit for the ISB 6.7L engine acts as a multi-function monitor and interface between the DEF tank and the engine’s after-treatment system. It ensures the correct level, temperature and quality of DEF are maintained, and sends that information electrically to the vehicle systems so the SCR (Selective Catalytic Reduction) system can dose the fluid correctly. If any of these subsystems fail (level sensor, temp sensor, concentration sensor, or plumbing interfaces) it can lead to fault codes or derate conditions.
Driving with a failing Diesel Exhaust Fluid (DEF) head unit is not recommended. The DEF head unit monitors critical data such as fluid level, temperature, and quality—information your truck’s emissions system relies on to operate correctly. When the sensor fails, the system can no longer verify DEF conditions, triggering warning lights or fault codes.
At first, you may only see a Check Engine Light or DEF warning. However, as the issue persists, the engine control module (ECM) may begin restricting power and limiting vehicle speed to comply with emissions laws. This “derate” mode helps protect the environment but can leave you stranded if ignored.
Risks of driving with a bad DEF head unit include:
- Reduced fuel efficiency
- Limited speed (usually capped at 5–10 mph)
- Potential emission system damage
- Unexpected downtime or towing costs
If you suspect a DEF head unit failure, schedule service immediately. A professional technician can scan for fault codes, verify DEF quality, and confirm whether replacement is needed. Addressing the problem early keeps your diesel engine compliant, reliable, and ready for the road.
Yes — if the unit fails to deliver correct DEF dosage or sensor signals, it can trigger SCR system faults or engine derate warnings.
Exposure to crystallised DEF, harsh vibration, dirt ingress and extreme temperatures are frequent contributors to failure.
Power down the system, relieve DEF line pressure, clean the tank and lines of crystals, and ensure a clean, dry mounting area prior to installation.
Clear any existing fault codes, verify through monitoring that DEF dosing and sensor readings are within normal range, and perform a short functional run-test.
Cummins DEF Head Units
