JOHN DEERE ADBLUE® INJECTION UNIT, PART NUMBER RE555626

This AdBlue® injection unit (RE555626) is designed for various John Deere machines in the 8R/8RT, 9R/RT/RX, 8000, S, T, and W series. It is part of the SCR emission control system, where the AdBlue® fluid is metered to help treat exhaust gases. To select the correct part, identifying it by part number and machine application is the most important factor.

A Component of the AdBlue®/SCR System

The AdBlue® injection unit is one of the components that manage the injection of urea solution into the selective catalytic reduction system. On a machine equipped with SCR, this component works with the rest of the emission control system to supply the designated line and ensure the dosage required by the system.

In the workshop, it may also be referred to as the urea injection unit for John Deere. When this part is replaced, the goal is generally to restore an existing assembly to working order without altering the machine’s original design. Part number RE555626 therefore remains the key identifier.

Extensive and Specific John Deere Applications

This part number is listed for several John Deere machine families. The detailed applications cover the 8R/8RT, 9R/RT/RX, 8000, S, T, and W series, with a specific list of models associated with the part number.

The series listed cover different machine families within John Deere. This diversity underscores the importance of checking model by model: a part number intended for an 8320R, an 8320RT, or a 9420RX cannot be automatically applied to a similar model if it does not appear in the listed applications.

Key guidelines for confirming your choice

For this injection unit, selection is based primarily on the part number and machine assignment, rather than on overall dimensions. Before ordering, be sure to compare part number RE555626 with the one already installed or with the machine’s maintenance manual.

In practice, a search using the terms “AdBlue® injector,” “doser,” or “urea module” may yield several components from the same system. Identifying the part by reference number RE555626 prevents confusion between this unit and other emissions control parts.

• Verify the complete John Deere model designation;
• Check the part number visible on the removed part, if it is still identifiable;
• make sure it is indeed the unit from the relevant AdBlue®/SCR system.

A single suffix letter may be enough to distinguish between configurations. This check is particularly useful for similar model designations such as 8R, 8RT, 9R, 9RT, or 9RX.

In what situations is this part needed?

This type of component is generally sought when there is a fault in the AdBlue® injection system, a malfunction in the SCR system, or during the overhaul of the emissions control system. The replacement aims to restore a system that is consistent with the machine’s intended application.

In day-to-day maintenance, this need also arises when a machine reports a fault related to AdBlue® management and the injection unit is among the components to be inspected or replaced. For this type of system, a proper replacement always begins with a thorough identification of the part number.

To select the correct AdBlue® injection unit, start with the part number, verify the exact model designation of your John Deere, and cross-reference it with the list of models listed for RE555626.

Compatibility by Brand and Series

John Deere · 8R Series

• /8RT
• 8245R
• 8270R
• 8295R
• 8320R
• 8320RT
• 8335R
• 8345R
• 8345RT
• 8370R
• 8400R

John Deere · 9R Series · /RT/RX:

• 9370R
• 9420R
• 9420RX
• 9470R
• 9470RT
• 9470RX
• 9520R
• 9520RT
• 9520RX

John Deere · 8000 Series

• 8100
• 8200
• 8300
• 8400
• 8500
• 8600

John Deere · S Series

• S 660
• S 670
• S 685
• S 690

John Deere · T Series

• T560
• T660
• T670

John Deere · W Series

• W650
• W660
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FAQ — Frequently Asked Questions

What is the purpose of an AdBlue® injection unit on a John Deere machine?

It is used to meter AdBlue® into the machine’s SCR system. This injection of urea solution helps treat exhaust gases; to select the correct part, you must match this function to part number RE555626 and the applicable John Deere model.

Is part number RE555626 compatible with the John Deere 8320RT and 9420RX?

Yes, both of these models are listed among the applications for part number RE555626. The same part number is also associated with other John Deere models in the 8R/8RT, 9R/RT/RX, 8000, S, T, and W series; always verify the machine’s full model designation.

How can I confirm that part number RE555626 is the correct one?

The first step is to locate the part number RE555626 on the removed part or in the machine’s maintenance manual. Next, compare the exact John Deere model designation, as similar designations such as 9R, 9RT, and 9RX do not always correspond to the same assembly.

Under what circumstances is this injection unit replaced?

It is generally replaced when there is a fault in the AdBlue® circuit or during an SCR system overhaul. If the machine has a problem related to urea injection, this unit may be one of the components that needs to be replaced, after the part number has been correctly identified.

Original spare part numbers and brand names are provided for comparison purposes only. This does not imply that these are original parts.