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November 1, 2021 Service bulletin

Field Service Campaign for Western Star 49X Transmission Cooler Plumbing

Western Star technical service bulletin SF641 for 2021-2022 Western Star 49X.

Bulletin number
SF641
Component
Power train
Summary
Field Service Campaign for Western Star 49X Transmission Cooler Plumbing. Due to normal vibrations combined with inadequate support, the quick-connect fittings on the transmission oil cooler lines may experience excessive wear, leading to a transmission oil leak; if not addressed, this could lead to transmission damage.

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