Perkins Engines Perkins DEF Head Unit
PERKINS ENGINES PERKINS 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 1795-13-2 ( OEM Part Number T434680 ). This part is primarily made for a Perkins , and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
Additional Notes: DEF Header, Helical Heater, 40 MICRON, 13"
OEM NUMBERS
| Primary OEM | T434680 |
| Additional OEM | T431863, T434680 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541344 |
| 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.
The Perkins Engines DEF Head Unit OEM T434680 is a factory-original component designed to ensure reliable function of the Diesel Exhaust Fluid system in Perkins-powered equipment. Manufactured to precise OEM specifications, this unit provides accurate fitment and dependable operation across a range of applications. Its role in the emissions system supports compliance with environmental standards while contributing to smooth and consistent engine performance. Built with durability in mind, it is engineered to handle the demands of heavy-duty use in challenging work environments. As an OEM replacement, this DEF head unit offers the trusted quality and long-lasting service operators expect from Perkins.
PEOPLE ALSO ASKS | BLOG(S)
Modern Perkins engines use advanced emission systems to meet strict environmental standards, and the DEF (Diesel Exhaust Fluid) Head Unit plays a central role in that process. The Perkins OEM T434680 DEF Head Unit is a smart assembly designed to manage, monitor, and protect the DEF system so the engine can operate efficiently and stay compliant.
Core Functions
The DEF Head Unit T434680 combines several components into one compact unit:
- DEF Level Sensor
- Tracks fluid level in the tank and signals when refilling is needed.
- Quality Sensor
- Monitors the concentration of DEF to ensure it meets proper specifications.
- Temperature Sensor
- Detects fluid temperature to protect against freezing or overheating.
- Heater Circuit
- Uses coolant or electric elements to keep DEF in liquid form in cold conditions.
- Pickup and Return Lines
- Provide suction for DEF delivery to the injector and return unused fluid back to the tank.
- Electrical Interface
- Communicates all sensor data to the engine control module (ECM).
By combining level, quality, and temperature monitoring with heating and fluid management, the Perkins DEF Head Unit OEM T434680 ensures reliable DEF supply and proper dosing. This helps protect the aftertreatment system, reduces downtime, and keeps the engine compliant with emissions regulations.
The DEF (Diesel Exhaust Fluid) head unit is a critical part of your emissions system. When it starts to fail, your truck will usually give you warning signs before it reaches full derate mode. Recognizing these symptoms early can save time, money, and frustration.
Common Signs of a Failing DEF Head Unit
If the head unit is going bad, you may notice:
- Warning lights
- or DEF-related fault codes on the dashboard
- Incorrect DEF readings,
- such as showing empty when the tank is full
- Check engine light
- triggered by emissions system errors
- Unexplained derate mode,
- reducing your truck’s speed or limiting mileage
- Failure to start countdowns,
- leaving you stranded if ignored
These issues happen because the head unit monitors DEF level, temperature, and quality. If it can’t report accurate data to the engine control module, the system assumes the emissions equipment isn’t functioning. That triggers restrictions designed to keep the vehicle compliant.
Catching these signs early gives you a chance to schedule service before being stuck with severe driving limits. If you notice any of these symptoms, it’s best to have your DEF system inspected right away.
It ensures accurate DEF monitoring so the emissions system functions correctly.
Yes, a failing unit can trigger emissions faults and reduce operating capability.
Yes, it is designed as a direct-fit component for Perkins DEF tank assemblies.
Delays can cause false DEF readings and potential equipment downtime.
