CAT Caterpillar C3.6 DEF Head Unit
CAT CATERPILLAR C3.6 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 1795-13-1 ( OEM Part Number 5913428 ). This part is primarily made for a Caterpillar C3.6, 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 | 5913428 |
| Additional OEM | 5356923, 5913428 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541337 |
| 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.
Built for dependability, the CAT Caterpillar C3.6 DEF Head Unit OEM 5913428 is designed to keep the Diesel Exhaust Fluid system functioning properly in C3.6 engines. This genuine OEM component is crafted to meet Caterpillar’s exact standards, ensuring a precise fit and consistent operation across heavy-duty applications. By supporting emissions compliance, it helps maintain reliable engine efficiency while meeting regulatory requirements. Its durable construction is made to withstand the tough conditions of daily equipment use. For operators who depend on Caterpillar machinery, this DEF head unit provides trusted reliability and long-term service.
PEOPLE ALSO ASKS | BLOG(S)
The Caterpillar C3.6 engine is designed with advanced emission technology, and one of the most important components in that system is the DEF (Diesel Exhaust Fluid) Head Unit. The OEM 5913428 DEF Head Unit is a multifunctional device that ensures the DEF system works reliably, keeping the engine compliant and efficient.
Core Functions
The DEF Head Unit combines multiple sensors and pathways into a single assembly:
- DEF Level Sensor
- Monitors how much fluid is in the tank.
- Quality Sensor
- Verifies that DEF meets the correct chemical concentration and purity.
- Temperature Sensor
- Tracks the fluid temperature to prevent freezing or overheating.
- Coolant / Heating Circuit
- Maintains DEF at the right temperature for proper flow.
- Pickup and Return Lines
- Manages DEF delivery to the injector and sends unused fluid back to the tank.
- Electrical Interface
- Communicates real-time data to the engine control module (ECM).
During operation, the DEF Head Unit constantly measures fluid level, quality, and temperature. If conditions fall outside specifications, it signals the ECM to alert the operator or adjust system behavior. The heating function ensures DEF stays usable in cold weather, while built-in lines keep fluid circulating smoothly.
Without the DEF Head Unit, the engine would not properly control DEF dosing, risking compliance issues and operational interruptions. The OEM 5913428 is therefore critical to both reliability and environmental responsibility.
When a DEF (Diesel Exhaust Fluid) head unit begins failing, many drivers wonder if it can simply be cleaned or repaired instead of replaced. While the idea sounds practical, the reality is more complicated.
Why Cleaning Isn’t an Option
The DEF head unit contains sensitive sensors and electronic components sealed inside the assembly. These sensors monitor fluid level, temperature, and quality. Once they are exposed to contamination or internal failure, they cannot be restored by cleaning. Attempting to open the unit can cause more damage.
Common Causes of Failure:
- Contaminated DEF fluid
- introducing crystals or debris
- Extreme temperatures
- damaging internal electronics
- Moisture intrusion
- into sealed areas
- Age-related wear
- from years of operation
In most cases, a bad DEF head unit cannot be repaired. The unit is designed as a sealed component, and replacement is the industry standard solution. Some drivers may attempt DIY fixes, but these usually result in temporary relief at best and can create further issues.
DEF head units are not built for cleaning or repair. The most reliable option is replacement, paired with proper DEF handling and storage to prevent future failures.
It supplies the engine module with accurate DEF data to maintain emissions compliance.
Yes, failure may trigger system warnings and limit engine functionality until replaced.
It transmits real-time information on DEF fluid level, quality, and temperature.
They use diagnostic tools to check stored codes and monitor DEF sensor readings.
Caterpillar DEF Head Units
