Mack CH — MPG, VIN Decoder, Recalls, Reliability & Specs

What's wrong. On certain truck chassis, the steering gear mounting bolts were over-torqued at installation. The steering gear is mounted to the vehicle's frame rail with 3 bolts.

Risk. Failure of two of the three bolts could result in the loss of steering, which could result in loss of vehicle control, increasing the risk of a crash .

Fix. Dealers will inspect vehicles. New steering gear mounting bolts will be installed. The recall began october 2004. Owners should contact mack at 1-610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. On certain heavy duty class 8 diesel trucks equipped with aset ac engines, the location of the fuel inlet hose may result in overheating or abrasion of the hose, which may lead to a premature failure.

Risk. If the hose fails, fuel can be sprayed on the exhaust manifold, which could potentially lead to an engine compartment fire.

Fix. Dealers will repair and replace the fuel inlet hose free of charge. The recall began on february 14, 2005. Due to some quality and supply issues with parts to support this safety recall, owners may have been informed during april 2005,that the safety recall was on hold. These issues have now been resolved. For owners who have not had their vehicle(s) repaired, contact a mack parts and service center immediately to schedule an appointment to have your vehicle(s) repaired. Owners may contact mack trucks at 610-709-2131.

What's wrong. On certain trucks equipped with aset ac model engines, the engine as configured with an external exhaust gas recirculation system makes servicing the fuel injection lines difficult when using traditional tools. Therefore, it is possible for fuel leaks to develop when removing and installing the fuel injection lines.

Risk. A leak in the fuel injection line may spray fuel on the hot surfaces of the exhaust gas recirculation system, which could result in an engine fire.

Fix. Dealers will replace the fuel injection lines free of charge. Note: this recall supersedes a previous campaign conducted in 2006 (please see 06v392). The recall began on september 11, 2007, with subsequent mailings every six weeks until april 2008. Owners may contact mack at 800-528-6586.

What's wrong. On certain trucks, a leak in the aset ac fuel injection line may spray fuel on the exhaust gas recirculation pipes that carry hot exhaust gases .

Risk. This could potentially result in an engine fire.

Fix. Mack has issued a stop work on this campaign under further notice (2-22-2007). The remedy does not adequately address the issue on all vehicles. Mack will re-release the recall in the near future. (please see nhtsa no. 07v159/mack recall no. Sco323 for vehicles that have had this repair already performed.) this recall has been superseded (please see 07v401/sc0324).

What's wrong. On certain chassis equipped with dana steering axle assemblies. These axles are built with an integral knuckle and steering arm. The steering arm could have longitudinal cracks.

Risk. The ball stud could become loose, causing loss of steering control which could result in a crash.

Fix. Dealers will inspect the integral knuckle and steer arm and replace if necessary. Owner notification began on january 16, 2004. 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 1-610-709-3337.

What's wrong. On certain truck chassis, the steering gear mounting bolts were made of inconsistent bolt material, which has led to bolt failures. This inconsistent bolt material condition could result in a failure of a steering gear mounting bolts. The steering gear is mounted to the vehicle's frame with three bolts.

Risk. Failure of two of the three bolts could result in the loss of steering, which could result in loss of vehicle control and crash without warning.

Fix. Dealers will inspect vehicles. New steering gear mounting bolts will be installed. The recall began october 2004. Owners should contact mack at 1-610-709-3337.

What's wrong. Certain heavy duty vehicles fail to comply with the requirements of federal motor vehicle safety standard no. 121, "air brake systems." improper seating of the check valve retainer in the brass fitting housing has occurred. It is possible for the air brake system pressure to push the check valve internal parts into the primary system reservoir and a vehicle operator would not know that this has happened.

Risk. In this condition, the vehicle would not meet the emergency requirements of the standard.

Fix. Dealers will replace the check valve. Owner notification began november 26, 2003. Owners should contact mack at 1-610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. On certain heavy duty class 8 diesel trucks equipped with aset ac engines, the location of the fuel inlet hose may result in overheating or abrasion of the hose, which may lead to a premature failure.

Risk. If the hose fails, fuel can be sprayed on the exhaust manifold, which could potentially lead to an engine compartment fire.

Fix. Dealers will repair and replace the fuel inlet hose free of charge. The recall began on february 14, 2005. Due to some quality and supply issues with parts to support this safety recall, owners may have been informed during april 2005,that the safety recall was on hold. These issues have now been resolved. For owners who have not had their vehicle(s) repaired, contact a mack parts and service center immediately to schedule an appointment to have your vehicle(s) repaired. Owners may contact mack trucks at 610-709-2131.

What's wrong. On certain trucks equipped with aset ac model engines, the engine as configured with an external exhaust gas recirculation system makes servicing the fuel injection lines difficult when using traditional tools. Therefore, it is possible for fuel leaks to develop when removing and installing the fuel injection lines.

Risk. A leak in the fuel injection line may spray fuel on the hot surfaces of the exhaust gas recirculation system, which could result in an engine fire.

Fix. Dealers will replace the fuel injection lines free of charge. Note: this recall supersedes a previous campaign conducted in 2006 (please see 06v392). The recall began on september 11, 2007, with subsequent mailings every six weeks until april 2008. Owners may contact mack at 800-528-6586.

What's wrong. On certain trucks, a leak in the aset ac fuel injection line may spray fuel on the exhaust gas recirculation pipes that carry hot exhaust gases .

Risk. This could potentially result in an engine fire.

Fix. Mack has issued a stop work on this campaign under further notice (2-22-2007). The remedy does not adequately address the issue on all vehicles. Mack will re-release the recall in the near future. (please see nhtsa no. 07v159/mack recall no. Sco323 for vehicles that have had this repair already performed.) this recall has been superseded (please see 07v401/sc0324).

What's wrong. Certain class 8 chassis fail to comply with requirements of federal motor vehicle safety standard no. 121, "air brake systems." the installation of the additional axle(s), raises the gvw capability of the vehicle and therefore requires an increase in the parking brake performance to hold on a 20% grade in order to meet the requirements of the standard.

Fix. Dealers will modify the park brake configuration on these vehicles. 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 1-610-709-3337.

What's wrong. On certain class 8 chassis equipped with r. H. Sheppard "m100" steering gears and trw "tas65" steering gears, a power steering hose with an incorrect pressure rating was installed by the factory.

Risk. The hose, which connects the power steering pump to the steering gear, could burst or leak, which could result in the loss of power steering assist.

Fix. Dealers will replace the power steering hose. Ower notification began june 20, 2002. 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 1-610-709-3337.

What's wrong. On certain trucks equipped with manifold dash valves with push to connect fittings used to control the park brake function on trucks and trailers with air brakes, the park knob can pop out unexpectedly while the vehicle is in motion. This will exhaust the air from the park brake system on the trailer and apply the parking brakes.

Risk. If this condition is not noticed, the driver could lose control of the vehicle, possibly resulting in a vehicle crash.

Fix. Haldex has notified its customers to make arrangements to have the valve inspected and, if necessary, replaced free of charge. Owner notification is expected to begin during january 2003. 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 haldex brake systems at 816-801-2641 or mack at 1-610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. On certain heavy duty class 8 diesel trucks equipped with aset ac engines, the location of the fuel inlet hose may result in overheating or abrasion of the hose, which may lead to a premature failure.

Risk. If the hose fails, fuel can be sprayed on the exhaust manifold, which could potentially lead to an engine compartment fire.

Fix. Dealers will repair and replace the fuel inlet hose free of charge. The recall began on february 14, 2005. Due to some quality and supply issues with parts to support this safety recall, owners may have been informed during april 2005,that the safety recall was on hold. These issues have now been resolved. For owners who have not had their vehicle(s) repaired, contact a mack parts and service center immediately to schedule an appointment to have your vehicle(s) repaired. Owners may contact mack trucks at 610-709-2131.

What's wrong. On certain trucks equipped with aset ac model engines, the engine as configured with an external exhaust gas recirculation system makes servicing the fuel injection lines difficult when using traditional tools. Therefore, it is possible for fuel leaks to develop when removing and installing the fuel injection lines.

Risk. A leak in the fuel injection line may spray fuel on the hot surfaces of the exhaust gas recirculation system, which could result in an engine fire.

Fix. Dealers will replace the fuel injection lines free of charge. Note: this recall supersedes a previous campaign conducted in 2006 (please see 06v392). The recall began on september 11, 2007, with subsequent mailings every six weeks until april 2008. Owners may contact mack at 800-528-6586.

What's wrong. Vehicle description: trucks equipped with e-tech engines. A condition exists on the auxiliary drive shaft of the e-tech engine that causes the loss of power steering on vehicles where the power steering pump is mounted off the front of the engine.

Risk. This could result in the loss of power steering.

Fix. Dealers will inspect the vehicles and replace the nut that holds the gear to the auxiliary drive shaft. Owner notification began march 22, 2002. 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.

What's wrong. On certain heavytrucks equipped with truck hub units manufactured by skf exclusively for use on arvinmeritor's ff98x series non-drive steer axles, the hub unit bearings can wear prematurely.

Risk. Seizure of the bearings can cause wheel separation or wheel end fire.

Fix. Dealers will replace all front axle hubs. Owner notification began on oactober 14, 2003. Customers will be informed of parts availability by october 3, 2003. 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 610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. Vehicle description: heavy duty trucks equipped with certain meritor-wabco brake system two and four port relay valves. The valve may stick open when a high-pressure application is released.

Risk. When the valve sticks open, it can result in a total loss of air from either the service or the park brake system. The driver may lose braking ability under a service application, possibly resulting in a vehicle crash.

Fix. Dealers will replace these valves. Owner notification began november 16, 2001. 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 or meritor wabco at 800-535-5560.

What's wrong. On certain class 8 heavy duty trucks equipped with r. H. Sheppard m90 steering gears, an incorrect hose was used for the high-pressure line between the power steering pump and the steering gear. The hose is rated at 2000 psi, while it should be rated at 3000 psi.

Risk. This hose could develop a leak or burst while in service. Should the line burst, steering control would still be maintained, but a loss of power assist will be experienced.

Fix. Dealers will replace the steering hose. Owner notification began march 22, 2002. 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.

What's wrong. Vehicle description: heavy duty trucks built with bendix air abs with an ec-17 1030r electronic control unit (ecu), there have been reports of unwanted abs activation at low speeds caused by 1) chafed abs wheel speed sensor wires on rotating parts or 2) a damaged component at the wheel end that generates a certain type of erratic sensor signal.

Risk. This condition could cause the abs ecu to exhaust the air at the air brake modulators for one or more of the wheels. This could result in extended braking distances and a possible crash.

Fix. Dealers will replace the abs ecu.

What's wrong. Vehicle description: class 8 trucks equipped with felsted electronic accelerator pedals. The return springs can break on the accelerator pedals that are equipped with stainless steel or electroplated wire return springs.

Risk. This condition could cause the pedal to go to full throttle if both return springs break, increasing the risk of a crash.

Fix. Replacement accelerator pedals equipped with return springs manufactured of music wire with one additional coil on each spring and with an organic coating, eliminating electroplating will be installed.

What's wrong. On some heavy duty class 8 vehicles equipped with arvinmeritor axle assemblies which may have been manufactured with trw model 20edl ball sockets, the tie rod ball-socket bearings have a below specification case depth and/or hardness which can lead to premature wear out of the socket in some applications.

Risk. If this condition occurs, the driver can lose steering control, possibly resulting in a vehicle crash.

Fix. Dealers will replace the ball socket assemblies. This campaign will supersede nhtsa recall nos. 01v-140-005 (mack sc0270) and 00v-246-103 (mack sc0262). Owner notification began december 27, 2002. 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 610-709-3337.

What's wrong. Vehicle description: heavy duty trucks equipped with trw tie rod ends on certain dana/spicer axles (e12001) and mack axles through dana heavy axle (fawl 12). The tie rod and drag link ball stud ends contain bearings that are below the specified case depth and/or hardness.

Risk. This can lead to premature wear with possible separation of the ball stud from the socket, increasing the risk of loss of control of the vehicle.

Fix. Dealers will remove and replace all affected tie rods and drag links with different designed ends. Trucks that have been repaired under recall 00v246103/sc0262 will not be re-recalled. Trucks only inspected and determined to have an acceptable date code under sc0262 will be recalled under this campaign. Owner notification began january 8, 2003. 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.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. Vehicle description: heavy duty trucks equipped with certain meritor-wabco brake system two and four port relay valves. The valve may stick open when a high-pressure application is released.

Risk. When the valve sticks open, it can result in a total loss of air from either the service or the park brake system. The driver may lose braking ability under a service application, possibly resulting in a vehicle crash.

Fix. Dealers will replace these valves. Owner notification began november 16, 2001. 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 or meritor wabco at 800-535-5560.

What's wrong. On certain class 8 heavy duty trucks equipped with r. H. Sheppard m90 steering gears, an incorrect hose was used for the high-pressure line between the power steering pump and the steering gear. The hose is rated at 2000 psi, while it should be rated at 3000 psi.

Risk. This hose could develop a leak or burst while in service. Should the line burst, steering control would still be maintained, but a loss of power assist will be experienced.

Fix. Dealers will replace the steering hose. Owner notification began march 22, 2002. 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.

What's wrong. Vehicle description: heavy duty trucks built with bendix air abs with an ec-17 1030r electronic control unit (ecu), there have been reports of unwanted abs activation at low speeds caused by 1) chafed abs wheel speed sensor wires on rotating parts or 2) a damaged component at the wheel end that generates a certain type of erratic sensor signal.

Risk. This condition could cause the abs ecu to exhaust the air at the air brake modulators for one or more of the wheels. This could result in extended braking distances and a possible crash.

Fix. Dealers will replace the abs ecu.

What's wrong. Vehicle description: heavy duty trucks equipped with drag link assemblies containing 24-dl model ball sockets and manufactured by trw. Certain of the tie rod ball-socket bearings have a below-specification case depth and/or hardness, which can lead to premature wear of the socket.

Risk. If this condition occurs, the driver can lose partial control of the right front wheel, possibly resulting in a crash.

Fix. Dealers will replace the defective drag links. Owner/distributor notification began august 30, 2001. 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 or trw customer service at 1-866-280-3287.

What's wrong. On certain heavytrucks equipped with truck hub units manufactured by skf exclusively for use on arvinmeritor's ff98x series non-drive steer axles, the hub unit bearings can wear prematurely.

Risk. Seizure of the bearings can cause wheel separation or wheel end fire.

Fix. Dealers will replace all front axle hubs. Owner notification began on oactober 14, 2003. Customers will be informed of parts availability by october 3, 2003. 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 610-709-3337.

What's wrong. On some heavy duty class 8 vehicles equipped with arvinmeritor axle assemblies which may have been manufactured with trw model 20edl ball sockets, the tie rod ball-socket bearings have a below specification case depth and/or hardness which can lead to premature wear out of the socket in some applications.

Risk. If this condition occurs, the driver can lose steering control, possibly resulting in a vehicle crash.

Fix. Dealers will replace the ball socket assemblies. This campaign will supersede nhtsa recall nos. 01v-140-005 (mack sc0270) and 00v-246-103 (mack sc0262). Owner notification began december 27, 2002. 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 610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. Vehicle description: class 8 trucks equipped with felsted electronic accelerator pedals. The return springs can break on the accelerator pedals that are equipped with stainless steel or electroplated wire return springs.

Risk. This condition could cause the pedal to go to full throttle if both return springs break, increasing the risk of a crash.

Fix. Replacement accelerator pedals equipped with return springs manufactured of music wire with one additional coil on each spring and with an organic coating, eliminating electroplating will be installed.

What's wrong. Vehicle description: heavy duty trucks equipped with trw tie rod ends on certain meritor axles. The tie rod and drag link ball stud ends contain bearings that are below the specified case depth and/or hardness.

Risk. This can lead to premature wear with possible separation of the ball stud from the socket, increasing the risk of loss of control of the vehicle.

Fix. Dealers will remove and replace all affected tie rods and drag links with different designed ends.

What's wrong. Vehicle description: heavy duty trucks built with bendix air abs with an ec-17 1030r electronic control unit (ecu), there have been reports of unwanted abs activation at low speeds caused by 1) chafed abs wheel speed sensor wires on rotating parts or 2) a damaged component at the wheel end that generates a certain type of erratic sensor signal.

Risk. This condition could cause the abs ecu to exhaust the air at the air brake modulators for one or more of the wheels. This could result in extended braking distances and a possible crash.

Fix. Dealers will replace the abs ecu.

What's wrong. On certain heavytrucks equipped with truck hub units manufactured by skf exclusively for use on arvinmeritor's ff98x series non-drive steer axles, the hub unit bearings can wear prematurely.

Risk. Seizure of the bearings can cause wheel separation or wheel end fire.

Fix. Dealers will replace all front axle hubs. Owner notification began on oactober 14, 2003. Customers will be informed of parts availability by october 3, 2003. 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 610-709-3337.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. Vehicle description: class 8 heavy duty trucks. During assembly, insufficient torque occurred of the drag link to the axle steering arm connection. If the drag link to axle sttering arm connection is not torqued and the cotter pin is not installed, the nut could back off during vehicle operation.

Risk. If the nut backs off, there could be a loss of driver control.

Fix. Dealers will retorque the drag link to the axle steering arm connection.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. Vehicle description: heavy duty trucks equipped with design level 1, rockwell ff980 series front axle. The front axle hub flange can develop cracks due to high stress levels.

Risk. Cracks in a hub flange can result in a wheel separation.

Fix. Dealers will remove and replace the front hubs with an improved design level 2 hub.

What's wrong. The u-joint bearing strap bolts were not properly tightened during assembly.

Risk. Insufficient torque can lead to a broken strap. If the strap breaks, the driveshaft would wobble, possibly resulting in separation. Such wobbling or separation would result in damage to other components of the vehicle and any loose fragment could fall to the roadway presenting a hazard to following vehicles.

Fix. Dealers will install a new u-joint bearing strap bolts.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. 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.

Risk. If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.

Fix. 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.

What's wrong. On certain chassis built with lng engines, the nexgen lng tank's primary and secondary relief valves could fail to open and relieve tank pressure.

Risk. This could cause ice buildup on the discharge side of the primary and secondary pressure system allowing the relief system to freeze and become blocked resulting in over pressurization of the lng tanks creating the risk of catastrophic tank rupture which could cause serious injury or death.

Fix. Dealers will retrofit the lng tanks with a new primary relief valve pipe away tube and a new ventilated shroud. The recall began april 6, 2004. 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 1-610-709-3337.

What's wrong. 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.

Risk. If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.

Fix. 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.

What's wrong. 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.

Risk. If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.

Fix. 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.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. The carrier yoke bolts were manufactured with worn rolling thread dies, causing stress concentrations which caused cracks during the quenching process.

Risk. This condition can cause bolt failure and allow thedriveline to separate from the carrier assembly.

Fix. Replace the carrier yoke bolts.

What's wrong. The engine cooling fan blades may break due to inadequate blade strength around the rivets that attach the blades to the fan spider.

Risk. If complete fracture of the fan blade occurs, it couldbe propelled outside the fan shroud, injuring person(s) in the vicinity ofthe truck.

Fix. An improved fan will be installed on these vehicles.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. 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.

Risk. If the air dryer separates from the base, the cartridge can separate sufficiently enough to cause personal injury or property damage.

Fix. 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.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. The carrier yoke bolts were manufactured with worn rolling thread dies, causing stress concentrations which caused cracks during the quenching process.

Risk. This condition can cause bolt failure and allow thedriveline to separate from the carrier assembly.

Fix. Replace the carrier yoke bolts.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.

What's wrong. The engine cooling fan blades may break due to inadequate blade strength around the rivets that attach the blades to the fan spider.

Risk. If complete fracture of the fan blade occurs, it couldbe propelled outside the fan shroud, injuring person(s) in the vicinity ofthe truck.

Fix. An improved fan will be installed on these vehicles.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. Lap and shoulder seat belt arrangement for fixed (non-suspension) seats does not meet the seat belt loading requirements of fmvss 210. The inboard clinch nut in cab sill, where the buckle for the shoulder and lap belt is mounted, pulled out of the sill during the tests. Consequence of defect: if seat belt anchirage fails, the seat occupant faces an increased risk of injury in an accident or sudden stop.

Fix. Relocate the inboard seat belt mounting from top of the sill to the forward flange of the sill on the cab floor, and add a 3mm fillet weld around the 2 inboard clinch nuts.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.

What's wrong. The engine cooling fan blades may break due to inadequate blade strength around the rivets that attach the blades to the fan spider.

Risk. If complete fracture of the fan blade occurs, it couldbe propelled outside the fan shroud, injuring person(s) in the vicinity ofthe truck.

Fix. An improved fan will be installed on these vehicles.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. Lap and shoulder seat belt arrangement for fixed (non-suspension) seats does not meet the seat belt loading requirements of fmvss 210. The inboard clinch nut in cab sill, where the buckle for the shoulder and lap belt is mounted, pulled out of the sill during the tests. Consequence of defect: if seat belt anchirage fails, the seat occupant faces an increased risk of injury in an accident or sudden stop.

Fix. Relocate the inboard seat belt mounting from top of the sill to the forward flange of the sill on the cab floor, and add a 3mm fillet weld around the 2 inboard clinch nuts.

What's wrong. The upper and lower pinch bolt on the steering pitman arm and the lower pinch bolt connection on shephard power gears were not torqued correctly.

Risk. Pinch bolt could loosen and break; this could cause loss of truck steering control and result in a crash.

Fix. Install english hex head bolts and flat washers; torque pinch bolts to specifications.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. Lap and shoulder seat belt arrangement for fixed (non-suspension) seats does not meet the seat belt loading requirements of fmvss 210. The inboard clinch nut in cab sill, where the buckle for the shoulder and lap belt is mounted, pulled out of the sill during the tests. Consequence of defect: if seat belt anchirage fails, the seat occupant faces an increased risk of injury in an accident or sudden stop.

Fix. Relocate the inboard seat belt mounting from top of the sill to the forward flange of the sill on the cab floor, and add a 3mm fillet weld around the 2 inboard clinch nuts.

What's wrong. The upper and lower pinch bolt on the steering pitman arm and the lower pinch bolt connection on shephard power gears were not torqued correctly.

Risk. Pinch bolt could loosen and break; this could cause loss of truck steering control and result in a crash.

Fix. Install english hex head bolts and flat washers; torque pinch bolts to specifications.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. Internal components of the e-12 dual circuit air brake valves may be misassembled so that one of the tapered snap rings is upside down.

Risk. The snap ring can come out causing the valve tomalfunction and apply the truck's brake system without warning; this couldresult in loss of control and a crash.

Fix. Replace misassembled valves.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.

What's wrong. Steering wheel retaining nuts may have been improperly installed and/or torqued.

Fix. Renew and retorque steering wheel retaining nuts.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. Lap and shoulder seat belt arrangement for fixed (non-suspension) seats does not meet the seat belt loading requirements of fmvss 210. The inboard clinch nut in cab sill, where the buckle for the shoulder and lap belt is mounted, pulled out of the sill during the tests. Consequence of defect: if seat belt anchirage fails, the seat occupant faces an increased risk of injury in an accident or sudden stop.

Fix. Relocate the inboard seat belt mounting from top of the sill to the forward flange of the sill on the cab floor, and add a 3mm fillet weld around the 2 inboard clinch nuts.

What's wrong. The upper and lower pinch bolt on the steering pitman arm and the lower pinch bolt connection on shephard power gears were not torqued correctly.

Risk. Pinch bolt could loosen and break; this could cause loss of truck steering control and result in a crash.

Fix. Install english hex head bolts and flat washers; torque pinch bolts to specifications.

What's wrong. The driveshaft center bearing support bracket can crack and break.

Risk. 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.

Fix. Dealers will replace the center bearing hanger bracket.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.

What's wrong. Steering wheel retaining nuts may have been improperly installed and/or torqued.

Fix. Renew and retorque steering wheel retaining nuts.

What's wrong. Vehicle description: heavy duty class 8 trucks equipped with fontaine fifth wheel assemblies. The fifth wheel mounting plates can crack.

Risk. Under the trailer loading, the mounting plate could eventually fail due to fatigue.

Fix. Dealers will inspect and replace the mounting plates that are cracked.

What's wrong. Fuel injection system reconfiguration to comply with engine emission standards cause higher engine vibration levels which lead to early wear and complete failure of the secondary throttle return mechanism.

Risk. In the event the primary throttle return fails, failure of the secondary throttle return system would not provide protection against loss of throttle control.

Fix. A new production secondary throttle return system configuration will be installed.