{"source":"nhtsa","country":"us","campaign":"91V080000","date":"1991-05-23","owner_notified":"1991-05-02","manufacturer":"MACK TRUCKS, INCORPORATED","component":"STEERING:HYDRAULIC POWER ASSIST SYSTEM","summary":"INCORRECT MANUFACTURE OF THE HYDROBOOST CYLINDER ALLOWS THE BALL SOCKET CLAMP TO CONTACT RIGHT SIDE STEERING LEVER ON AN EXTREME LEFT TURN AND CAUSE FLEXING OF THE CYLINDER ROD .","consequence":"THIS FLEXING CAN CAUSE SEAL FAILURE OR CYLINDER FAILUREOF THE HYDROBOOST UNIT AND RESULT IN LOSS OF STEERING CONTROL AND RESULT IN AVEHICLE ACCIDENT.","remedy":"REPLACE INCORRECTLY BUILT BOOST CYLINDERS.","notes":"SYSTEM: STEERING POWER ASSIST, HYDROBOOST ASSEMBLY.VEHICLE DESCRIPTION: CF AERIALSCOPE MODEL.","mfr_campaign":null,"part_number":null,"units":35,"completion":null,"do_not_drive":false,"park_outside":false,"notification":null,"french":null,"vehicles":[{"year":1988,"make":"MACK","model":"CF","vehicle_id":"1988_mack_cf","match":"exact","built_from":"1988-03-01","built_to":"1989-06-01"},{"year":1989,"make":"MACK","model":"CF","vehicle_id":"1989_mack_cf","match":"exact","built_from":"1988-03-01","built_to":"1989-06-01"}],"may_apply":true,"as_of":"2026-10-19","lookup":{"nhtsa":"https://www.nhtsa.gov/recalls","tc":"https://wwwapps.tc.gc.ca/Saf-Sec-Sur/7/VRDB-BDRV/search-recherche/menu.aspx?lang=eng","maker":null},"attribution":[],"url":"https://open.wenmarpro.com/recalls/nhtsa/91V080000"}