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Manitowoc/ Grove Cummins ISL DEF Head Unit

MANITOWOC/ GROVE 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 90026954
PART TYPE DEF Head Unit
BRAND Tamerx Diesel Products
ENGINE MAKE Cummins
ENGINE TYPE ISL
YEAR
PART NUMBER 4310-11-9
APPLICATION NOTES Manitowoc/ Grove
ADDITIONAL NOTES DEF Header, 40 MICRON, 11"

PRODUCT DESCRIPTION

This is a Remanufactured, Tamerx DEF Head Unit, Tamerx part number 4310-11-9 ( OEM Part Number 90026954 ). 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 OEM90026954
Additional OEM90026954

ADDITIONAL DETAILS

CONDITIONRemanufactured
UPC / Barcode00840490540026
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.


Elevate your heavy-duty emissions system with the Manitowoc / Grove Cummins ISL DEF Head Unit — precision-engineered for crane and lift applications under the toughest conditions. This rugged module delivers real-time monitoring of DEF fluid level, temperature, and quality, helping your SCR system avoid derates and maintain performance. Seamlessly integrated and built for longevity, it’s the emissions upgrade your equipment trusts on every jobsite.

PEOPLE ALSO ASKS | BLOG(S)

Operating a crane rig like Manitowoc or Grove with a Cummins ISL engine brings heavy demands—and emissions compliance is no exception. At the core of your aftertreatment system lies the DEF (Diesel Exhaust Fluid) head unit. This specialized module monitors fluid status, ensures accurate dosing, and communicates with your engine’s control module. When it falls short, error codes, derates, or system faults can suddenly disrupt your uptime.

  • Tracks DEF fluid level, temperature, and urea concentration, sending real-time data to the ECU

  • Manages precise dosing of DEF into the exhaust stream so the SCR (Selective Catalytic Reduction) system can reduce NOx effectively

  • Built to match OEM tolerances for drop-in compatibility with Manitowoc / Grove Cummins ISL setups

  • Helps prevent warning codes, emissions faults, or engine derates tied to sensor drift or inaccurate feedback

  • Designed to endure vibration, temperature cycling, and exposure to corrosive DEF

  • Field-friendly installation minimizes downtime when replacement is required

Cranes face tough operating conditions, and you can’t afford nonsense from your emissions system. Installing the correct DEF head unit restores feedback integrity, stabilizes your SCR performance, and keeps your rig compliant and ready to lift—without surprises short-changing your productivity.

The DEF (Diesel Exhaust Fluid) head unit plays a crucial role in monitoring fluid level, temperature, and quality to keep emissions systems compliant. Because it operates directly inside the DEF tank, it is highly sensitive to temperature changes. Both extreme cold and heat can influence how well it functions and how accurately it communicates with the engine control module (ECM).

Ways Temperature Impacts DEF Head Unit Performance

  • Freezing Conditions
    DEF freezes at around 12°F (-11°C). When frozen, the sensors may struggle to provide accurate readings until the fluid thaws.

  • High Heat Exposure
    Prolonged heat can degrade DEF fluid quality and put stress on the head unit’s electronics, sometimes leading to false fault codes.

  • Rapid Temperature Fluctuations
    Sudden shifts from hot to cold can strain internal sensors, causing inconsistent or erratic readings.

  • Crystallization Concerns
    Freeze-thaw cycles encourage DEF crystallization, which can build up on sensors and interfere with accurate monitoring.

  • Reduced Lifespan
    Extreme weather conditions—whether very hot or very cold—can shorten the overall service life of the unit.

Temperature has a direct effect on how reliably a DEF head unit operates. Cold can freeze DEF, heat can degrade it, and fluctuating conditions can stress sensors. Protecting vehicles from extreme environments and performing regular inspections helps ensure the DEF head unit delivers accurate data and continues supporting emissions compliance.

Yes — strong vibration or impact can damage sensors, loosen connectors, or cause leaks.

Codes like “level sensor out of range,” “temperature sensor fault,” or “filter clogged” are possible.

Use a diagnostic tool to check live level and temperature readings and ensure there are no active DEF faults.

Use high-quality, ISO-compliant DEF, avoid contamination, inspect and clean the strainer, and ensure sensors/heater operate correctly.

 

Cummins DEF Head Units

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