{"nhtsa_id":601384,"type":"service_bulletin","type_name":"Service bulletin","date_added":"1998-08-03","date":"1998-06-05","document_id":"980605-P1506","mfr_campaign":null,"replaces":"980504-P1506","component":"SUSPENSION","mfr_system":null,"summary":"SUBJECT ON AL SUSPENSIN HEIGHT CONTROL VALVE LINKAGE ROD UPGRADE, AND HEIGHT CONTROL VALVE TRAVEL OVER CENTER CONDITION. *YC","document":null,"url":"https://open.wenmarpro.com/bulletins/601384","components":[{"id":"suspension","name":"Suspension","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MACK","model":"CH","year_from":null,"year_to":null,"match":"exact","vehicle_ids":[]},{"make":"MACK","model":"CL","year_from":null,"year_to":null,"match":"exact","vehicle_ids":[]}],"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":[]}