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TICO Tractors Cummins DEF Head Unit

TICO TRACTORS CUMMINS DEF HEAD UNIT

Shipping ICON

ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY

WARRANTY ICON

WARRANTY
1M MILES OR 1 YEAR

$895.00

CORE CHARGE:

$250.00
iCORE DISCLAIMER: The CORE charge is a 30 day hold and will not be processed as long as the CORE is returned within 30 days. If you do not have a CORE or fail to return the CORE within 30 days, the CORE charge hold amount will be processed at that time.

AVAILABILITY IN STOCK
OEM NUMBER620840
PART TYPEDEF Head Unit
BRANDTamerx Diesel Products
ENGINE MAKECummins
ENGINE TYPE
YEAR
PART NUMBER4310-11-30
APPLICATION NOTESTICO Tractors
ADDITIONAL NOTESDEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-30 ( OEM Part Number 620840 ). 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, 11"

OEM NUMBERS

Primary OEM620840
Additional OEM620840, 62433-1

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490541177
WEIGHT8.00 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.


Boost your terminal tractor’s emissions control with the TICO Tractors Cummins DEF Head Unit — precision-engineered for seamless compatibility with Cummins systems in TICO yard machines. This rugged, high-accuracy unit delivers real-time monitoring of DEF level, temperature, and quality, helping your SCR system avoid derates and stay compliant even under heavy use. Built for tough environments and backed by Tamerx’s trusted warranty, it’s the dependable upgrade your fleet needs to stay clean, efficient, and road-ready.

PEOPLE ALSO ASKS | BLOG(S)

Out in heavy-duty yard or terminal service, reliability is king—and that applies just as much to your emissions components as your powertrain. The TICO Tractors Cummins DEF Head Unit (OEM 620840) is one of those parts that usually flies under the radar—but when it works right, it keeps your DEF (Diesel Exhaust Fluid) system accurate, compliant, and resilient. A fail here can cascade into warnings, derates, and unwanted downtime.

  • Measures DEF fluid parameters: level, temperature, and urea concentration, sending clean signals to the ECU

  • Regulates proper dosing of DEF into the exhaust stream to allow the SCR (Selective Catalytic Reduction) system to reduce NOx emissions efficiently

  • Designed to OEM 620840 standards, giving you drop-in compatibility with TICO / Cummins setups

  • Helps prevent fault codes, emission warnings, engine derates caused by bad sensor readings or drift

  • Built for durability—able to stand up to vibration, temperature swings, and DEF’s corrosive nature

  • Simplified replacement process to minimize service time

If your terminal tractor or yard equipment is throwing DEF system errors or running into emissions trouble, the DEF head is often one of the first suspects. By installing the correct OEM 620840 TICO Tractors Cummins DEF Head Unit, you restore accurate sensing, protect your SCR system, and reduce the risk of surprise maintenance stops. It’s a small component—but its impact on uptime and compliance is anything but small.

The DEF (Diesel Exhaust Fluid) head unit is a vital part of a diesel emissions system. Its primary role is to monitor DEF level, quality, and temperature, ensuring the engine remains compliant with emissions regulations. To perform these functions, the DEF head unit combines several important components into one assembly.

Key Components Inside a DEF Head Unit

  • Level Sensor
    Measures the amount of DEF in the tank and sends data to the engine control module (ECM).

  • Quality Sensor
    Monitors the urea concentration of DEF fluid to verify that it meets emissions standards.

  • Temperature Sensor
    Tracks the fluid temperature, ensuring proper function in both hot and cold conditions.

  • Heater Element (in many units)
    Prevents DEF from freezing in low temperatures, allowing the system to operate reliably in cold climates.

  • Electrical Connectors
    Provide communication between the DEF head unit and the ECM, transmitting all sensor data.

  • Housing Assembly
    Encases and protects the sensors and wiring, while also sealing against DEF fluid and contaminants.

The DEF head unit may look like a simple component, but it contains multiple sensors and connections that are critical to emissions compliance. Each part works together to ensure accurate monitoring of the DEF system. Regular maintenance and clean, certified DEF fluid help protect these components and keep your vehicle running smoothly.

Flush gently with specification-grade DEF, avoid harsh solvents, and carefully clean around sensor ports.

Drain or isolate the DEF tank, disconnect fluid and electrical lines, remove the old head, install the new one, prime, and calibrate.

The engine may derate, produce emissions faults, or shift into a safe mode until the head is restored.

It sends electrical or digital signals representing level, temperature, and quality for the ECU to act upon.

Cummins DEF Head Units

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