7 recalls found. |
DEFECT #1 - STEERING:LINKAGES:KNUCKLE:SPINDLE:ARM
Posted on: 1979-10-12
Description
Deficiencies, in the form of forging laps, cracks and excessive decarburization during heat treatment, exist in the steering knuckles. Stresses imposed with integral hydraulic power steering may lead to a failure in the area of the steering arm attaching boss. This type of failure would cause loss of steering control.
Consequence
Corrective Action
Dealer will inspect and, if necessary, replace the left steering knuckle with an improved type of knuckle.
Notes
Vehicle description: truck tractors.system: steering; steering knuckle.consequences of defect: loss of steering control could cause a vehicleaccident.
DEFECT #2 - ENGINE AND ENGINE COOLING:COOLING SYSTEM:FAN
Posted on: 1979-10-12
Description
The flex blade fans on the involved vehicles may develop cracks in the laminated stiffener as a result of fatigue during operation. If such a condition exists and the cracks go undetected, continued operation could cause pieces of the stiffener to break off.
Consequence
Corrective Action
Dealer will replace the original fan with a steel fixed blade fan, free of charge.
Notes
Vehicle description: trucks equipped with six-cylinder engines.system: engine cooling; fan.consequences of defect: broken pieces can be propelled outside of the fanshroud and will present an immediate danger and possible injury to personsstanding nearby.note: prior to correction, vehicle should not be serviced with the hood raisedand the engine running.
DEFECT #3 - ENGINE AND ENGINE COOLING:ENGINE
Posted on: 1979-10-12
Description
Consequence
Corrective Action
Notes
Mack campaign no sco#46.models equipped with turbo unloader.mar 1969 thrunov 1973.trucks.possibility that the oil supply line to the turbo unloaderis routed too close to the turbo charger.if this condition exists, heat couldcause hose deterioration and oil leakage which could create a fire hazard.(correct by inspecting and relocating oil lines to provide adequate clearancebetween oil supply line and turbo changer).
DEFECT #4 - SERVICE BRAKES, AIR
Posted on: 1979-10-12
Description
Consequence
Corrective Action
Notes
Equipped with anchorlok spring brake chambers.manf'd jan.1971 thru march1973.trucks.possibility that the clamp ringbolts on the anchorlok springbrake chamber were incorrectly positioned at time of installation.in thisposition the end of the bolt may contact rear axle housing during brakeactuation.due to bracket deflection, the clamp ring or bolt may failpermitting the spring brake section to separate from the service chamber.(correct by inspecting and repositioning clamp and bolts).
DEFECT #5 - POWER TRAIN:AXLE ASSEMBLY:BANJO HOUSING
Posted on: 1979-10-12
Description
Consequence
Corrective Action
Notes
Mack trucks campaign no n/a.with sn56 and sw57 bogie housings.built mar1971 thru jun 1972.trucks.possibility that the bogie housing wall thicknessat the left inner wheel bearing race may not meet specific dimensionalrequirements.if this condition exists, it could lead to spindle failure,resulting in loss of a rear wheel assembly.(correct by inspecting andreplacing brgie housing where necessary).
DEFECT #6 - COMMUNICATIONS:HORN ASSEMBLY
Posted on: 1979-10-12
Description
Consequence
Corrective Action
Notes
Mack trucks campaign no n/a.manuf'd feb.1971 thru june 1973.trucks.possibility that the electric horn mounting bracket could crack and fail.ifthis condition exists the horn could interfere with steering shaft universaljoint and cause steering lockup in a left hand turn situation.(correct byinspecting and replacing horn assembly with improved type bracket).
DEFECT #7 - SUSPENSION:MULTIPLE AXLE
Posted on: 1979-10-12
Description
Consequence
Corrective Action
Notes
Mack trucks campaign no sc060.trucks mfg'd 1967 thru jan.31, 1973.possibility that the suspension trunnion brackets may develop cracks.if suchcondition exists and cracks are not detected, continued operation couldultimately lead to trunnion tube separation from the trunnion and permit axleassembly dislocation.failure of the trunnion bracket could result in loss ofvehicle control without warning to the driver.(correct by inspecting andreplacing brackets where necessary).