Doosan Bobcat Cummins DEF Head Unit
DOOSAN BOBCAT CUMMINS 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 4310-18-2 ( OEM Part Number 46850452 ). This part is primarily made for a Cummins , 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 | 46850452 |
| Additional OEM | 46699844, 46850452 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490540279 |
| 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.
Reliable DEF system operation is supported by the Doosan Bobcat Cummins DEF Head Unit: OEM 46850452, a direct-fit replacement for compatible Bobcat equipment. Built to OEM specifications, this unit monitors diesel exhaust fluid level, temperature, and quality to ensure consistent aftertreatment performance and compliance with emissions standards. Its rugged construction provides dependable service in tough working environments, protecting both the exhaust system and overall engine efficiency. Choosing an OEM DEF head unit helps reduce compatibility risks and promotes long-term reliability. This component is a trusted solution for keeping Doosan Bobcat Cummins-powered machinery running smoothly and without interruption.
PEOPLE ALSO ASKS | BLOG(S)
The DEF Head Unit with part number 46850452 is a multifunction component used in Doosan / Bobcat equipment powered by Cummins engines (especially for Gen‑7 “Portable Power” applications). It’s also known under other OEM or cross‑reference numbers. This head unit is mounted on the Diesel Exhaust Fluid (DEF) tank and serves as the control and monitoring hub for the DEF system.
The DEF Head Unit 46850452 performs several vital functions:
- It draws DEF fluid from the DEF tank to the dosing or exhaust treatment system so that the exhaust stream can reduce NOₓ emissions.
- It includes sensors (level, temperature) to monitor how much DEF is in the tank and whether the fluid is at the right temperature to be used effectively. If DEF is too cold or tank level is low, warnings or protective actions are triggered.
- It has internal filtration (common rating ~40 microns) to remove debris or particulate matter from the fluid before it is used downstream. This helps protect sensitive downstream components.
The head unit is crucial for emissions compliance and engine performance because without accurate sensing and delivery of DEF:
- Your equipment may generate warning codes or enter reduced power / derate mode.
- The Selective Catalytic Reduction (SCR) system can’t work as designed, leading to higher NOₓ emissions.
- Downstream components like DEF injectors or SCR catalysts may suffer damage if the fluid is contaminated or the system tries to operate with bad input.
In short, OEM 46850452 is essential to keeping your engine cleaner, lawful under emission regulations, and running reliably.
The Diesel Exhaust Fluid (DEF) head unit is responsible for monitoring fluid level, temperature, and quality inside the DEF tank. It plays a vital role in keeping the aftertreatment system functioning correctly. When the unit fails, it can lead to false warnings, system derates, or failed emissions checks. But what causes it to fail?
Common Causes of DEF Head Unit Failure
Several environmental and mechanical factors can lead to premature failure of the DEF head unit:
- Contaminated DEF fluid
- Poor-quality or expired fluid introduces impurities that can damage sensors.
- Crystallization
- DEF naturally forms crystals when exposed to air, which can block internal components.
- Freeze damage
- DEF freezes at 12°F (-11°C); repeated cycles can crack sensors or damage heating elements.
- Wiring issues
- Corroded connectors, broken pins, or moisture ingress disrupt sensor signals.
- Tank overfilling
- Spilled DEF can cause corrosion or short circuits if it reaches electrical contacts.
- Prolonged exposure to heat
- Excessive temperatures may degrade internal materials and electronics.
Use high-quality DEF, store fluid properly, and schedule regular system checks. Early attention to faults can prevent permanent damage to the unit.
Symptoms include inaccurate DEF readings, engine derates, or emissions warnings.
Yes, a failed unit can trigger derates that limit equipment productivity.
Yes, it is built to withstand vibration, extreme temperatures, and jobsite conditions.
Delays may lead to emissions faults, poor machine performance, and compliance issues.
Cummins DEF Head Units
