1971 MACK R Recalls (9)
- Campaign:
- 78V171000 on 10/11/1979
- Component:
- Steering:linkages:knuckle:spindle:arm
- Affected:
- 2,100
- Defect:
- 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.
- Correction:
- 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.
- Campaign:
- 74V002000 on 10/11/1979
- Component:
- Engine and engine cooling:engine
- Affected:
- 844
- 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).
- Campaign:
- 73V102000 on 10/11/1979
- Component:
- Service brakes, air
- Manufactured:
- 12/31/1970 - 02/28/1973
- Affected:
- 2,481
- 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).
- Campaign:
- 71V179000 on 10/11/1979
- Component:
- Fuel system, gasoline:carburetor system
- Manufactured:
- 11/30/1968 - 04/30/1971
- Affected:
- 15,002
- Notes:
- Built btwn dec.1968 and may 1971.truck tractors.possibil ity that airintake hood, which consists of metal cap attachedto perforated plastic innersection, may not securely clamp t o plastic section.if condition exists, capcan turn and cutplastic.if plastic is deeply cut, metal cap can separatecom pletely.such failure, particularly at high speeds, could cre atepotential risk to safety of other highway users.(correctby inspecting andreplacing with improved air intake hood whe re necessary.)
- Campaign:
- 74V032000 on 10/11/1979
- Component:
- Power train:axle assembly:banjo housing
- Affected:
- 9,019
- 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).
- Campaign:
- 72V127000 on 10/11/1979
- Component:
- Fuel system, gasoline:fuel injection system
- Manufactured:
- 07/31/1970 - 08/31/1971
- Affected:
- 1,410
- Notes:
- Mack service bulletin no g1003.equipped with american-bosch ape-8vbb fuelinjection pump.manfd 9-70 thru 10-16 1971.trucks.possibility that linkconnecting governor fulcrum lever to fuel injection pump control racks canbreak and cause loss of fuel delivery controlto engine.should this conditionoccur, it could impair vehicle control.(correct by inspecting and installingspring clip on fulcrum lever to prevent engine overspeed.)
- Campaign:
- 73V153000 on 10/11/1979
- Component:
- Communications:horn assembly
- Manufactured:
- 01/31/1971 - 05/31/1973
- Affected:
- 1,285
- 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).
- Campaign:
- 75V118000 on 10/11/1979
- Component:
- Suspension:multiple axle
- Affected:
- 414
- 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).
- Campaign:
- 72V041000 on 10/11/1979
- Component:
- Steering:linkages
- Manufactured:
- 07/31/1970 - 11/30/1971
- Affected:
- 538
- Notes:
- Mack campaign no r1005.equipped w/sgp48.trucks.possibility that if pitmanarm is not relocated and steering linkage readjusted, possible toggle conditionwill result in extreme right turn.(correct by inspecting and making necessaryadjustments.).
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