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The front hubs used do not support the gross axle weight rating of the front axle. Specifically, 5,987 Kg (13,200 lbs.) rated front hubs were used on trucks requiring a 6,622 Kg (14,600 lbs.) rated front axle. This can result in premature failure of the hub, bearings etc., which may cause the front hub assembly to separate from the front axle. If the front hub assembly separates, the driver may lose control of the vehicle or parts may be dropped on the road that can present a risk for other motorist.
On certain vehicles outfitted with Goodyear G399A LHS 295/75R22.5 LRG tires, the tires may not have been cured properly during manufacturing. This could cause the tires to have incomplete adhesion, which could lead to partial tread separation and/or tire failure.If the tread were to separate while a vehicle is in motion, it could cause a loss of vehicle control, which would increase the risk of a crash causing injury and/or damage to property.
According to Meritor, the axle lot may have been improperly heat treated causing a nonconforming metallurgical microstructure. The out of spec hardness of beam FF-967 diminishes its life and may lead to fracture. Failure of beam could lead to a loss of vehicle control and a vehicle crash.
Mack Trucks Inc. has determined the cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may be subject to premature loosening on certain CHU, CMH, CMM, CXU, GU, LEU, LR, MRU and TD model vehicles. The potential risk is that if the nut comes off, the yoke can separate from the axle input shaft and cause the driveshaft to disconnect. If this occurs, a disconnected driveshaft can disable the vehicle and result in debris in the roadway, which increases the risk of a vehicle crash.To address these concerns, Mack has developed an inspection and repair procedure that will help identify suspect components and prevent the possibility of future damage. Follow the procedure outlined in this document.
MACK Trucks, Inc. has determined that a defect that relates to motor vehicle safety exists in certain Titan model vehicles manufactured from February 25, 2015 to February 12, 2016. The bolt connecting the upper steering shaft to the lower steering shaft at the junction block may not properly secure the upper steering shaft. As a result, the upper steering shaft may separate without warning with complete loss of steering which may result in a vehicle crash.
Mack Trucks recently became aware of the risk of failure with a greaseable two-piece steering shaft manufactured by Willi Elbe. Based on our inquiry into these incidents, we are proactively contacting all of the owners of the affected vehicles and directing them to take the vehicles out of service as soon as possible. We have also stopped delivery of all vehicles equipped with the component, and will issue a safety recall.
Roll pin may be missing at junction block on the Willi Elbe brand 2 piece steering shaft used on certain Volvo trucks and the upper yoke on the Willi Elbe brand one piece shaft used on certain Mack trucks.Separation of the steering shaft may occur, which results in complete loss of steering.
The cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may be subject to premature loosening. If the nut comes off, the yoke can separate from the axle input shaft and cause the drive shaft to disconnect. A disconnected drive shaft can disable the truck and result in debris on the roadway, which increases the risk of a vehicle crash.
On certain 4x2 configured trucks, there may be a brake imbalance between the steer axle and drive axle brakes.
Suspect axles are equipped with hex nuts on the flange yoke that may not have been properly tightened. The driveshaft may disconnect from the drive axle, resulting in a loss of propulsion and increasing the risk of a crash.
According to Cummins, "In some natural gas powered engines installed exclusively in Mack trucks, the turbocharger oil supply line may make contact with or interfere with one or more of the following: the turbocharger inlet elbow, the OEM clean air intake clamp, or the air fuel control tube. The resulting contact or interference may damage the turbocharger oil supply line, possibly resulting in an oil leak."
Reference Fontaine Recall 15E-066 Fontaine Fifth Wheel Company (Fontaine) is recalling certain Ultra LT Fifth Wheel connectors, part number SLTPL4000, manufactured July 29, 2009 to May 27, 2013. Over time, improper coupling techniques may result in cumulative damage to the fifth wheel and its locking mechanism, which in turn may result in the locking mechanism failing to operate or to properly engage.
The air reservoirs do not comply with the capacity requirement in the U.S. and Canadian Motor Vehicle Safety Acts.
The chassis harness and air lines may not be properly secured at the crossmember. The potential risk is that electrical cables and air lines may fall down and be twisted up in driveline. If this occurs, important safety systems such as brakes will be affected, which may result in a vehicle crash.Mack Trucks has received no reports of crashes or personal injury as a result of this condition. Therefore, Mack considers this as a proactive measure to protect the public and Mack’s customers from the potential risk associated with this defect.
The brake chambers may have been incorrectly mounted on certain trucks with Meritor Air Disc Brakes. This can result in internal contamination of the air disc brake caliper, which may result in loss of brakes at the wheel end.Mack Trucks has received no reports of crashes or personal injury as a result of this condition. Therefore, Mack considers this as a proactive measure to protect the public and Mack’s customers from the potential risk associated with this defect.
According to Cummins, “Under conditions of excessive engine crankcase pressures, the 90-degree elbow of the vent tube assembly may become detached from the breather, possibly allowing engine oil to come into contact with hot surfaces. Engine oil contacting hot surfaces may ignite, possibly resulting in a fire.”Also Cummins stated that “Conditions which result in high engine crankcase pressure may result in a loss of engine power, may illuminate amber or red engine diagnostic lamps on the vehicle instrument cluster, or may result in erratic engine operation.”
The design requires the switch to be pushed in for three seconds for the fifth wheel latch to unlock, which is not working as designed. As a result, the driver may inadvertently press or bump the switch and release the latch when the park brake is applied. This can result in the trailer decoupling from the truck when the park brake is released.The switch is locked-out when the truck’s park brake is off so there is no risk of the fifth wheel coming unlocked by pressing the switch after the park brake is released.
The volume of air that can be stored in the air reservoirs is lower than the requirement as stated in S5.1.2 Reservoirs of FMVSS121, Air Brakes. The trucks as configured require 96 liters, but only 88 liters are available from the tanks fitted to the trucks.Mack Trucks has received no reports of crashes as a result of this condition. Therefore, Mack considers this as a proactive measure to protect the public and Mack’s customers from the potential risk associated with this non-compliance.
Because of stack-up tolerances, the actuator tab may be too short, which can allow the end of the tab to slide behind the inner door latch. If this occurs, the driver may not be able to open the door from inside the truck, which under certain circumstances may increase the risk of injury.Mack Trucks has received no reports of personal injury as a result of this condition. Therefore, Mack considers this as a proactive measure to protect the public and Mack’s customers from the potential risk associated with this defect.
According to Haldex, “during the assembly of the Life Seal actuator unit, the internal rubber diaphragm may not be fully seated in the spring piston of the parking brake section, thereby causing internal leakage from the service section past the diaphragm and potentially trapping air pressure in the parking brake section. This air pressure in turn, if not vented, may prevent full release of the actuator unit, and may induce dragging and overheated wheel end foundation service brakes.”The potential risk is for overheating at the wheel end, which increasing the risk of fire.
The Automatic Shut-down Protection System is a feature offered for trucks that operate in off road areas where other gases, such as Methane, may be pulled in through the air intake and potentially result in an over-speed condition.The automatic electric over-speed protection shutdown system is designed to continuously monitor diesel engine RPM and shutdown the engine in the event of an over-speed condition. There is also manual switch that is provided with the system for the driver to use in advance of intervention of the automatic system.Mack Trucks has determined that the system may have been incorrectly wired, which may result in the system not operating as designed. This presents a potential risk as the operator may not be able to control an unintended increase in the engine’s rpms if airborne hydrocarbons (combustible vapors) enter through the air intake, which may potentially cause a catastrophic engine failure and/or engine fire.
The collars that prevent the ball sockets from backing out of the tie rod may have been positioned incorrectly. If the ball socket comes loose, complete loss of steering or loss of steering at one wheel end can occur, which may result in a vehicle crash.
The tool used to torque the driver seat belt bolts to the seat frame, cab wall, and cab floor was found to be out of specification (having a lower torque than the value selected). As a result, the bolts may loosen over time and potentially cause the seat belt to detach. If this occurs, the seat belt may fail to restrain the occupant of the seat if a vehicle crash were to occur.
The engine control unit may have an incorrect parameter setting in the software, which may cause the engine to stall. If the engine stalls, the power steering and other safety related devices can become inoperable which increases the risk of a vehicle crash.
A program error occurred that can result in the visual and audible alerts not being provided to the driver. Therefore, the alerts may not warn the driver when an object is detected, which under certain conditions may increase the risk of a vehicle crash. This issue does not affect the active braking of the system, which will still engage as designed.
The pressure relief valve may not have been installed during manufacturing in the supply air tank for the brake system. As a result, the air tank may be compromised (e.g. rupture) over time, which may result in personal injury.
The Electronic flasher may prematurely fail. If this occurs, the hazard warning lights may not function and therefore may not alert other drivers, which may increase the risk of personal injury or a vehicle crash.
The vertical white conspicuity reflectors on the back of the cab may be blocked by the exhaust. As a result, a noncompliance with U.S. and Canada Motor Vehicle Safety Standard 108, which states “no more than 25% of their cumulative area may be obscured by vehicle equipment as determined in a rear orthogonal view,” may exist.
The exhaust pipe may disconnect from the muffler/ catalyst. If this occurs on a twin-steer configured vehicle where the vehicle is operated from the right side, the operator may be exposed to carbon monoxide levels which may cause personal injury.
The Electronic Power Distribution Module may be contaminated from water leaks in and around the windshield. If exposed to water leaks, contaminants such as road salt may deposit on the power distribution module. If this occurs, circuits may be bridged creating a high resistance short that may result in a vehicle fire.
The Automatic Shut-down Protection System is a feature offered for trucks that operate in off road areas where other gases, such as Methane, may be pulled in through the air intake and potentially result in an over-speed condition.The automatic electric over-speed protection shutdown system is designed to monitor diesel engine RPM and shutdown the engine in the event of an over-speed condition. There is also manual switch that is provided with the system for the driver to use in advance of intervention of the automatic system.The system was incorrectly wired. This results in the system not operating as designed. This presents a potential risk in applications where the Power Take-Off system is engaged, which may result in damage to equipment or personal injury.
“Certain IMMI seat belt assemblies equipped with L9 buckles do not satisfy the requirements of S4.3 (g) of FMVSS 209. When the push button on the buckle is pressed to release the latch plate for egress, the latch plate can become partially engaged with the buckle. Under this circumstance, the partially engaged latch plate may not separate from the buckle when a force of 22N is applied.The root cause of the noncompliance is associated with the locking pawl (part number 916030) inside the L9 buckle. Some locking pawls from specific manufacturing lots were produced with an excessively large burr. The burr on the locking pawl can catch the edge of the latch plate when the button is pressed to unlatch the buckle, causing a partial engagement condition.”
On certain 2014 Mack CXU and GU model vehicles manufactured from May 10, 2013 through June 12, 2013, the upper and lower steering shaft pinch bolt may have not been torqued to specification. As a result, the steering shaft may come loose. This can cause loss of steering control, which may lead to a vehicle crash.
On certain 2013 and 2014 Mack CHU, CXU, GU, LEU, and MRU model vehicles manufactured with pro‐torque axle spindle nuts from August 28, 2012 through August 16, 2013, the pro‐torque nut may not have been installed correctly, which may result in loosening of the nut. If the nut comes loose, the hub assembly may separate from the vehicle and result in a vehicle crash. This also presents a risk of impact with other motor vehicles or pedestrians which may result in property damage and personal injury.