Mack Chu — Steering
High risk
Sep 1, 2017
Model years: 2016
On certain vehicles, the castellated nut and cotter pin on the steer axle may not have been tightened to specification. This could cause the tie rod to become loose in the steer ax
Also affects: Mack Cxu
Mack Chu — Steering
High risk
Dec 20, 2016
Model years: 2012, 2013, 2014, 2017
On certain vehicles, the front hubs 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 requiri
Also affects: Mack Cxu, Mack Titan
Mack Chu — Powertrain
High risk
Oct 11, 2016
Model years: 2012, 2013, 2014, 2015, 2016
On certain vehicles, the cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may prematurely loosen. If the nut were to loosen and come off, the yoke co
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Lr, Mack Mru
Mack Chu — Powertrain
High risk
Feb 18, 2016
Model years: 2012, 2013, 2014, 2015
On certain vehicles, the cap nut that retains the interaxle driveshaft yoke to the rear axle input shaft may prematurely loosen. If the nut were to loosen and come off, the yoke co
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Td, Mack Mru
Mack Chu — Structure
High risk
Oct 8, 2015
Model years: 2012, 2013
On certain vehicles, the fifth wheel locking mechanisms could be susceptible to damage and/or wear. This could cause the locking mechanism to fail properly engage, potentially resu
Also affects: Mack Cxu
Mack Chu — Brakes
High risk
Aug 17, 2015
Model years: 2010, 2012, 2013, 2014, 2015, 2016
On certain vehicles, The chassis electrical harness and air brake lines may not have been properly secured at the crossmember. This could cause the electrical cables and air lines
Also affects: Mack Gu, Mack Cxu, Mack Td
Mack Chu — Accessories
High risk
Mar 10, 2015
Model years: 2011, 2012, 2013, 2014, 2015
On certain vehicles, the fifth wheel remote unlocking switch may not work as designed. As a result, the driver may inadvertently release the 5th wheel latch when the park brake is
Also affects: Mack Cxu
Mack Chu — Electrical
High risk
Jan 16, 2015
Model years: 2015
On certain model vehicles outfitted with an Automatic Over-Speed Protection system, the system may be incorrectly wired. This presents a potential risk as the operator may not be a
Also affects: Mack Cxu, Mack Gu
Mack Chu — Suspension
High risk
Nov 20, 2014
Model years: 2015
On certain vehicles, the collars that prevent the ball sockets from backing out of the tie rod may have been incorrectly positioned. If the ball socket(s) became loose, a complete
Also affects: Mack Cxu
Mack Chu — Electrical
High risk
Nov 20, 2014
Model years: 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015
On certain model vehicles, water around the windshield can migrate into the Electronic Power Distribution Module and contaminate it. As a result, circuits may be bridged creating a
Also affects: Mack Cxu, Mack Gu, Mack Td
Mack Chu — Seats And Restraints
High risk
Sep 9, 2014
Model years: 2015
On certain vehicles, bolts securing the seat belts to the seat frame, cab wall and cab floor may have been insufficiently tightened during vehicle assembly. As a result, bolts coul
Also affects: Mack Cxu, Mack Gu
Mack Chu — Lights And Instruments
High risk
Apr 22, 2014
Model years: 2010, 2011, 2012, 2013, 2014
On certain vehicles, the directional/hazard signal flasher may fail. Actuation of the turn signal or hazard lights in this condition would cause them to remain illuminated and not
Also affects: Mack Ct, Mack Cxu, Mack Gu, Mack Leu, Mack Mru
Mack Chu — Electrical
High risk
Feb 21, 2014
Model years: 2010, 2011, 2012
On certain model vehicles, water around the windshield can migrate into the Electronic Power Distribution Module and contaminate it. As a result, circuits may be bridged creating a
Also affects: Mack Cxu, Mack Gu, Mack Td
Mack Chu — Accessories
High risk
Dec 19, 2013
Model years: 2014
On certain model vehicles outfitted with an Automatic Over-Speed Protection system, the system may be incorrectly wired. This presents a potential risk in applications where the Po
Also affects: Mack Cxu, Mack Gu
Mack Chu — Powertrain
High risk
Oct 7, 2013
Model years: 2013, 2014
On certain vehicles, spindle nuts may have been installed incorrectly and could loosen, possibly resulting in the hub, wheel and tire assembly separating from the vehicle. This cou
Also affects: Mack Gu, Mack Cxu, Mack Leu, Mack Mru
Mack Chu — Brakes
High risk
May 10, 2013
Model years: 2013, 2014
On certain trucks, the cotter pin which retains the brake slack adjuster’s clevis pin may have been omitted during vehicle assembly. As a result, the clevis pin could loosen and fa
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Mru
Mack Chu — Wheels
High risk
Oct 11, 2012
Model years: 2013
On certain vehicles, the wheel rims may have been manufactured incorrectly and could fail. A wheel separating from the vehicle could cause a loss of control and a crash. In additio
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Mru
Mack Chu — Lights And Instruments
High risk
Sep 5, 2012
Model years: 2007, 2008, 2009, 2010
On certain trucks, an electrical short circuit in the fog light circuitry could result in a loss of low beam headlamp function. Loss of headlamp illumination, should it occur durin
Also affects: Mack Cxu
Mack Chu — Visual System
High risk
Jun 29, 2012
Model years: 2012
On certain vehicles, the hardware used to affix the windshield wiper linkage to the wiper motor may have been subject to rust and corrosion before assembly. This contamination may
Also affects: Mack Cxu, Mack Gu
Mack Chu — Brakes
High risk
Feb 1, 2012
Model years: 2012
On certain trucks equipped with Bendix ATR-6 Antilock Traction Relay valves, in extremely cold conditions (at or below -18 degrees Celsius), internal ATR valve leakage can occur. T
Also affects: Mack Cxu
Mack Chu — Other
High risk
Jul 21, 2011
Model years: 2010, 2011
On certain trucks, the clutch pedal assembly may have been manufactured incorrectly and could fail. This could allow the clutch pedal to fall to the floor, prohibiting clutch opera
Also affects: Mack Cxu, Mack Gu
Mack Chu — Powertrain
High risk
May 19, 2011
Model years: 2012
On certain trucks, the driveshaft may not have been welded correctly during the manufacturing process. This could allow the driveshaft to fracture along the length of the tube seam
Also affects: Mack Gu, Mack Cxu, Mack Leu, Mack Td, Mack Mru
Mack Chu — Brakes
High risk
May 2, 2011
Model years: 2011, 2012
On certain vehicles, the slack adjuster housings may have been manufactured incorrectly, which could allow the housings to fracture and fail. As a result, the wheel brake to which
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Mru
Mack Chu — Other
High risk
Mar 31, 2011
Model years: 2009, 2010, 2011
On certain trucks, the bolts used to secure the fifth wheel hitch assembly to the frame may not have received adequate tightening torque during vehicle assembly. This could allow t
Also affects: Mack Cxu
Mack Chu — Visual System
High risk
Oct 27, 2010
Model years: 2011
On certain vehicles, the rear conspicuity reflector typically found on the mud flap hanger brackets may not have been installed in the back of the cab which is the alternate positi
Also affects: Mack Cxu
Mack Chu — Steering
High risk
Nov 14, 2007
Model years: 2008
On certain trucks, the bolts that attach the steering gear to the frame may not have been tightened to the specified torque. This could allow the bolts to loosen and fall-out, poss
Also affects: Mack Cxu, Mack Cxn
Mack Chu — Lights And Instruments
High risk
Oct 10, 2007
Model years: 2008
On certain trucks, the Daytime Running Light (DRL) module may overheat and cause a vehicle fire. Correction: Dealers will replace the DRL module.
Also affects: Mack Cxu, Mack Gu, Mack Leu, Mack Mru
Mack Chu — Brakes
High risk
Aug 14, 2007
Model years: 2008
On certain vehicles, the internal rubber check valve inside the Bendix SR-7 spring brake modulating valve can become deformed over time. The effect of this defect is intermittent a
Also affects: Mack Cxn, Mack Cv, Mack Chn, Mack Ctp, Mack Mr
Mack Chu — Brakes
High risk
Aug 14, 2007
Model years: 2008
On certain school and transit buses, the Parker single check valve (SCV) that connects with the supply port of the Bendix SR-7 spring brake modulating valve may become excessively
Also affects: Mack Chn, Mack Ctp, Mack Cv, Mack Cxn, Mack Cxp
Mack Chu — Fuel System
High risk
Aug 7, 2007
Model years: 2008
On certain trucks, when the ignition key is in the 'ON' position, the pre-heater, located in the fuel filter base, is energized. If this pre-heater is energized while maintenance i
Also affects: Mack Cxn, Mack Cxp, Mack Cxu
Mack Chu — Steering
High risk
Jul 24, 2007
Model years: 2008
On certain trucks, the locknut used to retain the steering shaft may not have had the lock feature. As a result, the nut could loosen, allowing the steering shaft to separate, caus
Also affects: Mack Gu
Mack Chu — Steering
High risk
Jan 29, 2007
Model years: 2007
On certain trucks, the nut that retains the steering wheel may not have been installed, which may result in a loss of steering control and a crash. Correction: Dealers will inspect
Also affects: Mack Cxp, Mack Cxn, Mack Cxu, Mack Chn
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