2007 Mack CV Problems, Complaints & Recalls

Problem: Mack Trucks Inc. (Mack) is recalling certain model year 2010-2014 CHU, CXU, and MRU, 2007 CT and CV, 2008-2014 GU, and 2011-2014 LEU, and TD trucks manufactured February 28, 2006, through November 8, 2013, and equipped Hamsar Electronic Flasher. The hazard warning lights may fail.

Risk: A failure of the hazard warning lights could reduce the trucks visibility, increasing the risk of a crash.

Fix: Mack will notify owners, and dealers will replace the electronic flasher unit, free of charge. The recall will begin by mid-June 2014. Interim letters went out to owners on June 23, 2014. The recall began on July 25, 2014. Owners may contact Mack customer service at 1-866-298-6586. Mack's number for this recall is SC0379.

Problem: On certain trucks equipped with a saf holland simplex fifth wheel, the lever arm pivot bolt may have been over tightened. An over tightened pivot bolt can distort the pivot bolt spacer sleeve, which may prevent the fifth wheel latch jaw from closing and latching securely around the trailer king pin.

Risk: There is a possibility that the pivot bolt can become loose without the driver's knowledge. When this occurs, the driver could drive away and the trailer could become disengaged, increasing the risk of a crash.

Fix: Dealers will replace the pivot bolt and sleeve with a hex head shoulder bolt and washer free of charge. The recall began on january 28, 2008. Owners may contact mack trucks at 1-800-528-6586.

Problem: On certain trucks equipped with bendix sr-7 spring brake modulating valves, the internal rubber check valve may leak causing a delay in the application of the spring brakes to park the vehicle after the operator pulls the dash valve button.

Risk: This could delay or failure in applying the parking brakes which could result in a vehicle roll away, increasing the risk of a crash.

Fix: Mack is working with bendix to repair these vehicles (please see 07e037). Bendix will install a check valve repair kit for the affected sr-7 spring brake modulating valve free of charge. The recall began on january 10, 2008. Owners may contact bendix at 1-440-329-9000 or mack at 1-800-528-6586.

Problem: On certain trucks equipped with parker single check valves (scv) provided by bendix. The defect exists in the parker scv that connects with the supply port of the sr-7 spring brake modulating valve. After prolonged use of the parker scv, the valve body retainer may become excessively worn and eventually break apart. Pieces of the parker scv can become lodged inside the sr-7 spring brake modulating valve, potentially causing either leakage out of the sr-7 valve or preventing air from properly exhausting from the sr-7 valve.

Risk: This condition can cause a delay in the application of the spring brakes to park the vehicle after the operator pulls the dash valve button. These conditions can occur without warning, leading to unintended vehicle rollaway, brake drag, or in the case of loss of primary circuit, inability to modulate the spring brakes.

Fix: Mack is working with bendix to replace the parker single check valve. The recall began on january 9, 2008. Owners may contact bendix at 1-440-329-9000 or mack at 1-800-528-6586.

Problem: On certain trucks equipped with a 46k pound chalmers rear suspension, the adjustable torque rods used on the suspension may be brittle.

Risk: This may lead to a premature failure of the rod, which may result in a loss of control of the vehicle increasing the risk of a crash.

Fix: Dealers will inspect and repair the rods as required free of charge. The recall began on march 14, 2007. Owners may contact mack trucks at 1-800-528-6586.

Problem: Certain trucks equipped with a front glad hand option fail to comply with the performance criteria requirements of federal motor vehicle safety standard no. 121, 'air brake systems.'

Risk: The purpose of this standard is to insure safe braking performance under normal and emergency conditions.

Fix: Dealers will replace the spring brake modulating valve free of charge. The recall began on october 16, 2006. Owners may contact mack truck at 1-800-528-6586.

Problem: On certain trucks equipped with a legris air manifold, the brass push-to-connect cartridge may unexpectedly separate from the plastic housing.

Risk: If the push-to-connect cartridge that supplies the air to the park brake chambers were to separate, then the brakes could unexpectedly apply increasing the risk of a crash.

Fix: Dealers will replace the air manifold free of charge. The recall began on september 27, 2006. Owners may contact mack trucks at 1-800-528-6586.

Problem: On certain trucks equipped with sr-7 bendix brake valves, the check valve inside the valve cavity may not properly set, causing internal air leakage. If the check valve does not properly seat, the resulting leakage can cause a delay in the application of the spring brakes to park the vehicle after operator pulls the dash valve button.

Risk: The delayed parking brake application can occur without warning, leading to unintended vehicle rollaway increasing the risk of a crash.

Fix: Dealers will inspect the valves and replace it free of charge. The recall began on august 14, 2006. Owners may contact mack trucks at 1-800-528-6586.