1993 MACK CH Recalls (5)
- Campaign:
- 93V024000 on 03/24/1993
- Component:
- Trailer hitches
- Affected:
- 4,924
- Defect:
- The carrier yoke bolts were manufactured with worn rolling thread dies, causing stress concentrations which caused cracks during the quenching process.
- Consequence:
- This condition can cause bolt failure and allow thedriveline to separate from the carrier assembly.
- Correction:
- Replace the carrier yoke bolts.
- Notes:
- System: trailer yoke.vehicle description: heavy trucks.
- Campaign:
- 93V137000 on 08/31/1993
- Component:
- Engine and engine cooling:cooling system:fan
- Manufactured:
- 03/31/1991 - 04/30/1993
- Affected:
- 11,000
- Defect:
- The engine cooling fan blades may break due to inadequate blade strength around the rivets that attach the blades to the fan spider.
- Consequence:
- If complete fracture of the fan blade occurs, it couldbe propelled outside the fan shroud, injuring person(s) in the vicinity ofthe truck.
- Correction:
- An improved fan will be installed on these vehicles.
- Notes:
- System: engine; cooling fan.vehicle description: class 8 heavy trucks equipped with 6 bladed fansmanufactured by engineered cooling systems, inc.
- Campaign:
- 94V216000 on 11/21/1994
- Component:
- Power train:driveline:center support bearing
- Manufactured:
- 06/30/1988 - 02/28/1993
- Affected:
- 17,720
- Defect:
- The driveshaft center bearing support bracket can crack and break.
- Consequence:
- If this happens, the driveshaft will wobble and can separate. separation can result in damage to other components of the vehicle or loose fragments can fall onto the roadway presenting a hazard to other drivers.
- Correction:
- Dealers will replace the center bearing hanger bracket.
- Notes:
- System: powertrain; driveline; bracket; support; center shaft.vehicle description: class 8 heavy trucks.note: if the vehicle is presented to an authorized dealer on an agreed upon service date and the remedy is not provided free of charge within a reasonable time or the remedy does not correct the defect, contact mack trucks at 1-610-439-3011. also, contact the national highway traffic safety adminstration's auto safety hotline at 1-800-424-9393.
- Campaign:
- 95E003010 on 09/26/1995
- Component:
- Service brakes, air:supply:hoses, lines/piping, and fittings
- Manufactured:
- 09/30/1992 - 02/28/1995
- Affected:
- 1,224
- Defect:
- Air system blockage in the air dryer occurs degrading the moisture removing capabilities of the dryer when the vehicle is operated in a cold environment and moisture accumulates and freezes in the air dryer or in the line between the dryer and the air system reservoir. the air dryer can become overpressurized causing the air dryer cartridge to separate from the mounting base.
- Consequence:
- If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.
- Correction:
- Dealers will equip air systems with a pressure relief valve to be located between the compressor and the air dryer. this pressure relief valve is intended to vent if excessive pressure develops in the air dryer.
- Notes:
- System: brakes; air dryer. vehicle description: heavy duty class 8 trucks equipped with rockwell wabco system saver "1000" or system saver "twin" air dryer. note: if your vehicle is presented to an authorized dealer on an agreed upon service date and the remedy is not provided free of charge within a reasonable time, contact mack at 1-610-709-3011.also contact the national highwaytraffic safety administration's auto safety hotline at 1-800-424-9393.
- Campaign:
- 00V019003 on 05/10/2000
- Component:
- Trailer hitches:fifth wheel assembly
- Affected:
- 90
- Defect:
- Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. the fifth wheel mounting plates can crack.
- Consequence:
- Under the trailer loading, the mounting plate could eventually fail due to fatigue.
- Correction:
- Dealers will inspect and replace the mounting plates that are cracked.
- Notes:
- Mack recall no. sco259.owner notification began june 22, 2000.owner notification is expected to begin owners who take their vehicles to an authorized dealer on an agreed upon service date and do not receive the free remedy within a reasonable time should contact mack at 1-610-709-3011. also contact the national highway traffic safety administration's auto safety hotline at 1-888-dash-2-dot (1-888-327-4236).
1993 MACK CH TSB
- Bulletin:
- 09B014
- Component:
- 015000 steering:hydraulic power assist system
- Summary:
- Power steering seal update sheppard m100 steering gear used on ch model. *tw
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