John Deere Doser DEF Pump 2015-2020: OEM MIA885631
JOHN DEERE DOSER DEF PUMP 2015-2020: OEM MIA885631
ORDERS PLACED BEFORE 3PM EST WILL SHIP SAME DAY
WARRANTY
1M MILES OR 1 YEAR
PRODUCT DESCRIPTION
This is a Remanufactured Tamerx Doser DEF Pump, Tamerx part number MIA885631RM ( OEM Part Number MIA885631 ). All parts are proudly remanufactured in the U.S.A. to the highest of OEM standards, and improvements are often applied to the original design in the remanufacturing process. This part is primarily made for a John Deere , production years 2015-2020, and comes with a One Million Miles or One Year Warranty. For additional warranty info Click Here
OEM NUMBERS
| Primary OEM | MIA885631 |
| Additional OEM | MIA885631 |
ADDITIONAL DETAILS
| CONDITION | Remanufactured |
| UPC / Barcode | 00840490541955 |
| WEIGHT | 6.00 LBS |
SHIPPING OPTIONS
Ship Weight : 6.00 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.
Designed for John Deere equipment manufactured between 2015 and 2020, the Doser DEF Pump OEM MIA885631 ensures proper Diesel Exhaust Fluid delivery for consistent system performance. This genuine OEM part is built to factory specifications, providing accurate fitment and dependable operation in agricultural and industrial applications. By supporting reliable DEF flow, it helps maintain emissions compliance while contributing to smooth and efficient engine operation. Built with durability in mind, it withstands demanding work conditions to deliver long-lasting service life. For operators and fleets, this DEF pump offers OEM-backed quality and trusted reliability.
FITMENT CHART
| YEAR | MAKE | ENGINE(S) | ||||
|---|---|---|---|---|---|---|
| 2015 | John Deere | |||||
| 2016 | John Deere | |||||
| 2017 | John Deere | |||||
| 2018 | John Deere | |||||
| 2019 | John Deere | |||||
| 2020 | John Deere | |||||
PEOPLE ALSO ASKS | BLOG(S)
In modern diesel engines that use selective catalytic reduction (SCR), the Diesel Exhaust Fluid (DEF) system is critical for reducing emissions. The doser DEF pump—also called a DEF dosing unit pump—with part number MIA885631 serves a central role in that DEF system on John Deere machines built between 2015 and 2020.
What It Does
- Precise Fluid Delivery
- Its main job is to dose (meter) very specific amounts of DEF into the exhaust stream at the right time, under the control of the engine’s emission control module. This careful dosing is required so the system can convert nitrogen oxides (NOx) into harmless nitrogen and water.
- Maintains Pressure & Flow
- The pump ensures that DEF is delivered at the correct pressure and flow rate. Without the proper pressure, the injection would be inconsistent or fail, leading to emission errors or faults.
- Handles Harsh Conditions
- It is designed to operate reliably under extreme conditions—heat, vibration, and exposure to the chemical properties of DEF. It must resist clogging, corrosion, or degradation over time.
- Controls Dosing Timing
- The pump works in coordination with the vehicle’s sensors and emission control software. Based on engine load, exhaust temperature, and other inputs, the system signals the pump when and how much DEF to inject.
- Protects System Health
- By precisely dosing and pressurizing DEF, the pump helps avoid overuse (which wastes fluid) or underuse (which causes emission noncompliance). It also helps prevent system damage from improper injection.
The OEM MIA885631 doser DEF pump is the meter and pressure driver of the DEF system. It ensures DEF is delivered in the right amount, at the right time, and under the right pressure so the SCR system can do its job of cleaning exhaust. Would you like me to make a 200-word SEO blog version of this you can publish directly?
The DEF (Diesel Exhaust Fluid) doser pump is responsible for delivering DEF into the exhaust stream, where it helps reduce harmful emissions. If it begins to fail, your truck may experience warning lights, poor emissions performance, or even derate mode. Diagnosing a bad DEF doser pump involves a mix of observation, inspection, and testing.
- Step 1: Watch for Warning Signs
- Common signs of a failing DEF doser pump include:
- DEF system fault codes on the dashboard
- Check engine light triggered by emissions errors
- Unusual noises from the DEF system during operation
- Inconsistent DEF dosing, leading to excess smoke or reduced efficiency
- Derate countdowns, restricting vehicle speed or mileage
- Common signs of a failing DEF doser pump include:
- Step 2: Perform a Visual Inspection
- Check the DEF pump and surrounding lines for leaks, crystallization, or damaged connections. Build-up of white crystals around fittings often indicates DEF leakage.
- Step 3: Run Diagnostic Tests
- Using a scan tool, you can:
- Verify pump pressure
- Check flow rate and electrical signals
- Monitor sensor feedback for irregularities
- Using a scan tool, you can:
If the pump is not maintaining proper pressure or dosing correctly, it’s likely failing.
Diagnosing a bad DEF doser pump means looking for dashboard alerts, physical signs of leaks, and scan tool confirmation. If in doubt, a certified technician can confirm the diagnosis and recommend replacement before a complete failure occurs.
It ensures the proper delivery of DEF fluid for emissions control and compliance.
Yes, if the pump fails, the system may limit engine power to protect emissions standards.
Delaying replacement can lead to emissions faults, warning lights, and unexpected downtime.
Using high-quality DEF fluid and keeping the DEF system clean helps prevent premature wear.
John Deere Doser DEF Pumps
