{"nhtsa_id":11021336,"type":"service_campaign","type_name":"Service campaign","date_added":"2025-08-04","date":"2025-07-01","document_id":"S4533 072025","mfr_campaign":null,"replaces":null,"component":"ENGINE","mfr_system":null,"summary":"SC - Mack Trucks has determined that certain AN model trucks equipped with an MP8 Turbo Compound (TC) engine may experience TC Double Idler Gear failure due to incorrect bearing preload.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021336-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11021336-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11021336","components":[{"id":"engine","name":"Engine","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"ANTHEM (AN)","year_from":2025,"year_to":2025,"match":"base","vehicle_ids":["2025_mack_anthem"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}