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Mack technical service bulletin S4757 022026 for 2025-2026 Mack Pioneer PR (4) and 2026 Mack Anthem An (4).
- Bulletin number
- S4757 022026
- Component
- Engine
- Summary
- SC - Certain model AN(4)’s and PR’s could experience DEF leaks or crystallization due to the installation of incorrect fasteners for the Urea Dosage Valve.
Vehicles covered
- Mack Pioneer PR (4) 2025-2026 20252026
- Mack Anthem An (4) 2026 2026
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