
CAT / Perkins DEF Head Unit : OEM ASP-918-1795-18
CAT / PERKINS DEF HEAD UNIT : OEM ASP-918-1795-18

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a New, DuraWRX DEF Head Unit, DuraWRX part number ASP-918-1795-18 ( OEM Part Number ASP-918-1795-18 ). This part is primarily made for a CAT / 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, 18"
OEM NUMBERS
Primary OEM | ASP-918-1795-18 |
Additional OEM | 5356924, ASP-918-1795-18, ASP-918-1795-18 5913429, T431006, T434606 |
ADDITIONAL DETAILS
CONDITION | New |
UPC / Barcode | |
WEIGHT | 4.00 LBS |
SHIPPING OPTIONS
Ship Weight : 4.00 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.
Stay emissions-compliant and performance-ready with this DEF Head Unit for CAT and Perkins systems, OEM ASP-918-1795-18. Engineered to monitor DEF fluid level, temperature, and concentration, this unit ensures proper SCR system operation and helps reduce NOx emissions effectively. Built to strict OEM standards, it delivers reliable data, seamless integration, and long-lasting durability. Trust Tamerx for high-quality emissions components that keep your equipment running clean and efficient.
PEOPLE ALSO ASKS | BLOG(S)
Diesel Emission Fluid (DEF) systems rely on precise delivery and monitoring to reduce NOx emissions and comply with environmental standards. The CAT / Perkins DEF Head Unit OEM ASP-918-1795-18 plays a key role in this process by managing DEF fluid flow, temperature, and sensor data. This part is essential for ensuring that SCR (Selective Catalytic Reduction) systems operate efficiently and without interruption.
Main Features of the OEM ASP-918-1795-18 DEF Head Unit:
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Integrated Fluid Sensor Functions
Monitors DEF level and temperature to ensure proper operation and trigger alerts when needed. -
Supports DEF Heating
Built-in heating capability prevents DEF from freezing in colder temperatures, ensuring continuous flow. -
OEM-Specific Fit
Designed for seamless integration with CAT and Perkins DEF systems that require this exact part number. -
Durable Construction
Manufactured to handle demanding environments and extended use without failure. -
Supports Emissions Compliance
Contributes to accurate DEF dosing, helping vehicles stay within emissions regulations.
The CAT / Perkins DEF Head Unit OEM ASP-918-1795-18 is a critical part of any SCR-based emissions system. It ensures proper fluid flow and monitoring, allowing your equipment to function smoothly while maintaining emissions compliance. For dependable replacement part
The DEF (Diesel Exhaust Fluid) head unit plays a vital role in regulating the delivery of DEF into the exhaust system to reduce NOx emissions. If the head unit isn't working properly, your vehicle may experience fault codes, reduced engine power, or increased emissions. Testing the DEF head unit helps ensure the emissions system is operating as it should and can prevent downtime or costly repairs.
Ways to Test a DEF Head Unit for Proper Function:
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Use a Diagnostic Scan Tool – Plug in a compatible OBD-II or dealer-grade scan tool to check for fault codes related to the DEF system.
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Monitor Live Data – Review real-time readings such as DEF level, temperature, and pressure to verify correct sensor operation.
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Check DEF Pump Operation – Listen for pump activation during key-on cycles; no sound could indicate a problem with the head unit or pump motor.
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Inspect Electrical Connections – Make sure connectors are secure and free of corrosion that could interrupt signal flow.
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Test DEF Flow Rate (if applicable) – Some systems allow flow rate testing to determine whether the DEF is being delivered at the correct volume.
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Look for Crystallization or Leaks – Visual inspection around the head unit may reveal white residue or fluid leaks, which could signal component failure.
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Review Freeze Protection Function – On cold days, verify the DEF tank and head unit are warming up properly to prevent DEF from freezing.
Regularly testing your DEF head unit ensures your emissions system operates reliably and keeps your vehicle compliant with environmental regulations. A combination of diagnostic tools, visual checks, and attention to warning signs will help catch issues early and keep your diesel engine running efficiently.
It signals warning lights when it detects inaccurate DEF quality, level, or temperature readings.
Periodic cleaning is essential to prevent buildup and maintain sensor reliability.
With proper DEF use and maintenance, it often performs reliably beyond 100,000 miles.
DEF crystallization, electrical faults, or sensor degradation are common causes of false readings.