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Kalmar Ottawa Cummins ISL DEF Head Unit

KALMAR OTTAWA CUMMINS ISL 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 NUMBER 90035845
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE ISL
YEAR
PART NUMBER 4310-11-8
APPLICATION NOTES Kalmar Ottawa
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-8 ( OEM Part Number 90035845 ). This part is primarily made for a Cummins ISL, 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 OEM90035845
Additional OEM701805AT, 90035640, 90035845, OW90035640, OW90035845PS

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490539983
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.


Supercharge your fleet’s emissions control with the Kalmar / Ottawa Cummins ISL DEF Head Unit — precision-engineered for real-time monitoring of DEF level, temperature, and quality. Rugged and durable, this OEM-grade component integrates effortlessly into your SCR system to help prevent derates, maintain compliance, and keep your heavy-duty equipment running clean and confident every shift.

PEOPLE ALSO ASKS | BLOG(S)

In terminal operations and heavy lifting environments, Kalmar Ottawa machines rely on clean, consistent performance from their emissions systems. A central yet often overlooked component is the DEF (Diesel Exhaust Fluid) head unit. For Cummins ISL configurations, the OEM 90035845 DEF Head Unit (Tamerx part 4310-11-8) ensures your aftertreatment circuitry keeps correct readings and dosing. When that module is out of spec or failing, your SCR (Selective Catalytic Reduction) system’s reliability—and your vehicle’s uptime—are at risk.

  • Monitors DEF fluid level, temperature, and urea concentration, sending accurate feedback to the engine control module

  • Regulates precise dosing of DEF into the exhaust stream so NOx reduction is efficient and effective

  • Engineered to match OEM tolerances for drop-in compatibility with Kalmar Ottawa / Cummins ISL setups

  • Helps prevent fault codes, warning lights, and engine derates caused by incorrect sensor signals

  • Includes internal filtration (about 40 microns) to guard against contamination in the DEF plumbing

  • Built to sustain vibration, temperature swings, and exposure to DEF’s chemical stresses

A faulty or drifting DEF head often quietly undermines your emission system—until a warning light or derate catches you by surprise. Installing the correct OEM 90035845 Kalmar Ottawa DEF Head Unit restores the precision of your SCR feedback loop, stabilizes emissions control, and helps ensure your equipment stays in service, not sidelined. Even the smallest component in the chain deserves your attention—it’s often the difference between reliability and disruption.

The DEF (Diesel Exhaust Fluid) head unit is a key component of your emissions system, measuring DEF level, quality, and temperature. When it starts to fail, your vehicle may give several warning signs that should not be ignored. Recognizing these symptoms early can help you avoid costly downtime and keep your truck running smoothly.

Common Symptoms of a Failing DEF Head Unit

  • Dashboard Warnings
    The check engine light or DEF system alert may illuminate as soon as the sensors begin sending faulty signals.

  • Recurring Fault Codes
    Diagnostic trouble codes (DTCs) such as P203F (low DEF level), P205B (temperature sensor fault), or P207F (DEF quality issue) are often linked to head unit failures.

  • Inaccurate DEF Readings
    The system may show the tank as empty or full when it isn’t, making it hard to track real DEF levels.

  • False Quality Alerts
    You may get warnings about “bad DEF” even if you are using clean, certified fluid.

  • Engine Derate Mode
    If the ECM (engine control module) cannot confirm DEF data, it may reduce power or limit speed to stay compliant.

  • Erratic Sensor Behavior
    Fluctuating or inconsistent readings may point to internal sensor failure or crystallization buildup.

A failing DEF head unit often starts with dashboard warnings and inaccurate readings but can quickly escalate to derate mode or even shutdown. If you notice these symptoms, have the unit inspected promptly. Addressing the problem early ensures your vehicle stays reliable, emissions-compliant, and on the road where it belongs.

Flush the pickup area with clean, compliant DEF and gently clean or replace the internal strainer if needed.

Yes — impurities can clog the filter, degrade sensor accuracy, or lead to system faults.

Depressurize the DEF system, disconnect electrical connectors, unbolt the unit, and reseal properly on reinstalling.

With proper care and clean DEF, it often lasts several years, matching the life expectancy of the emissions system.

Cummins DEF Head Units

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