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Read articles →This is a real-world diagnostic repair, not a walkaround: a technician troubleshoots an 8335R that derated power and blocked parked regen due to high soot load. Using Service Advisor and a handheld pressure gauge, he traces the fault to a failed fuel dosing pump, replaces it, verifies pressure readings, then runs a full service regen and field-tests the tractor. Useful for owners facing regen/derate codes wanting actual diagnostic steps.
Posted by a field service technician ("Larry the tractor guy") working through a customer repair for the Western Equipment dealership channel.