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Read articles →An owner-operator walking through a recurring DEF injector clog on a 2017 Case IH Farmall 90C Tier 4 tractor. The video covers how to recognize the warning codes, the narrow window to act before limp mode locks you out, and the hands-on steps to remove, steam-clean, and reinstall the injector using basic tools. Most useful for Farmall 90C owners already dealing with this specific issue.
An owner-operator sharing a field-developed fix from their own experience with this tractor, with no apparent dealership or commercial affiliation.
The DEF injector in the emission system plugs up with a glossy, crystal-like buildup, which trips a warning code and can eventually lead to limp mode if not addressed.
Remove the access panel and bracket bolts, loosen the V-band clamp with a 5mm wrench, pull the injector out, steam clean the tip, and reinstall.
The tractor will only idle with no full power, and you must wait for the dealer to reset the code regardless of whether the injector is cleaned.
No, it is not hard, just tedious and time consuming, about the same amount of time as greasing the tractor and checking fluids.
