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Here Is WhyAn air gauge that stalls around 60 psi and will not climb is rarely the compressor. The governor sets cut-in and cut-out and drifts as it wears, or the air dryer purge valve is stuck open and dumping air as fast as the compressor makes it.https://www.youtube.com/embed/Fk-Qp6RHfy4282026-08-06yes https://langleymobiletruckrepair.ca/services/diesel-engine-repair/2026-11-11weekly0.8https://i.ytimg.com/vi/eLi3STOXtGo/maxresdefault.jpgEngine Derate in 3 Hours on a Kenworth T880: What It Actually MeansA dash reading ENGINE DERATE IN 3 HRS is not the engine failing, it is SCR inducement. How long you have depends on whether the truck has had the DEF inducement update. 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