Terex Detroit DD13, DD15 DEF Head Unit
TEREX DETROIT DD13, DD15 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 37547 ( OEM Part Number 37547 ). This part is primarily made for a Detroit DD13, DD15, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, 100 Micron, 18"
OEM NUMBERS
| Primary OEM | 37547 |
| Additional OEM | 34807, 34811, 37547 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541757 |
| 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.
Engineered for Terex equipment powered by Detroit Diesel engines, the DEF Head Unit OEM 37547 ensures proper operation of the Diesel Exhaust Fluid system in DD13 and DD15 models. This OEM component is manufactured to precise specifications, providing accurate fitment and reliable service in demanding work environments. By maintaining DEF system performance, it helps support emissions compliance and consistent engine function. Its rugged construction is designed to endure heavy-duty conditions, offering long-lasting dependability in construction and industrial applications. For operators, this DEF head unit delivers OEM-backed quality and the assurance of a trusted replacement.
PEOPLE ALSO ASKS | BLOG(S)
Modern Terex trucks powered by Detroit DD13 and DD15 engines rely on advanced emission systems to meet strict environmental standards. At the center of this system is the DEF (Diesel Exhaust Fluid) Head Unit, OEM 37547. Mounted at the top of the DEF tank, this unit is more than just a connector—it’s the control hub that manages fluid monitoring, routing, and communication with the engine.
Main Functions
- DEF Level Monitoring
- Measures the amount of fluid in the tank and sends this information to the engine control module (ECM).
- Temperature Sensing
- Keeps track of DEF temperature to prevent freezing or overheating that could affect system performance.
- Fluid Routing
- Provides the suction port that draws DEF into the dosing system and a return port for unused fluid to cycle back into the tank.
- Filtration
- Built-in strainer protects the system by preventing particles and crystals from reaching sensitive components.
- Data Communication
- Relays level and temperature data to the ECM so the engine can properly manage DEF dosing and issue warnings if needed.
The DEF Head Unit OEM 37547 ensures the SCR system works smoothly by combining monitoring, filtration, and fluid control into a single assembly. Without it, Terex trucks could not maintain emissions compliance or deliver reliable performance.
The DEF (Diesel Exhaust Fluid) head unit is essential for monitoring fluid quality, temperature, and level. Over time, it can fail, leading to dashboard warnings, fault codes, and even derate mode. Knowing when to replace it can help prevent costly downtime.
Signs It’s Time to Replace Your DEF Head Unit
Replacement is needed if you notice:
- DEF system fault codes
- that won’t clear
- Incorrect fluid readings,
- such as showing empty when the tank is full
- Check engine light
- tied to emissions problems
- Premature derate countdowns
- restricting mileage or speed
- Truck entering limp mode,
- limiting operation to just a few miles per hour
On average, a DEF head unit lasts 5 to 7 years, depending on handling and environmental conditions. Units exposed to poor-quality DEF, extreme temperatures, or contamination may fail much sooner.
Delaying replacement can leave you stranded with severe speed restrictions. A failing head unit cannot be repaired or cleaned — replacement with the correct OEM part is the only reliable solution.
You should replace your DEF head unit as soon as warning signs appear or when it reaches the end of its service life. Acting early prevents breakdowns and keeps your vehicle compliant.
It delivers accurate DEF data to keep emissions systems functioning properly.
Yes, a defective unit can trigger derate conditions that restrict engine operation.
It transmits fluid level, temperature, and quality readings from the DEF tank.
They use diagnostic tools to check error codes and analyze sensor outputs.
Detroit DEF Head Units
