2007 Mack CHN Problems, Complaints & Recalls

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 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.

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: Certain trucks were recalled for the installation of sleeves on the fuel injection line as required by safety recall sc0317 (nhtsa recall no. 06v392). There is a possibility that the new sleeves may chafe the fuel injection line.

Risk: This could compromise the fuel injection line over time which could possibly result in an engine fire.

Fix: Dealers will remove the protective sleeves on all fuel injection lines free of charge. This recall began on april 19, 2007. Owners may contact mack trucks at 1-800-528-6586.

Problem: On certain trucks, the axle housings may have been manufactured with steel that was out of specification which could result in a fatigue failure over time.

Risk: If a fatigue failure occurs and is left unattended, the axle may lock up or the end of the axle could come off, which could result in a vehicle crash.

Fix: Dealers will inspect and replace the axles free of charge. The recall is expected to begin on or about april 9, 2007. Owners may contact mack trucks at 1-800-528-6586.

Problem: On certain trucks, the nut that retains the steering wheel may not have been installed.

Risk: If the retaining nut was not installed, the steering wheel may come off, which could result in a vehicle crash.

Fix: Dealers will remove the horn button to confirm that the retaining nut was installed. A retaining nut will be added if the nut is missing. The recall began on february 12, 2007. Owners may contact mack trucks at 800-866-1177.

Problem: 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).

Problem: On certain trucks, the brake cam tubes on the steer and drive axles may not have been greased.

Risk: The brake cam journals may corrode which may lead to the brakes dragging which could result in a vehicle fire.

Fix: Dealers will add grease to the brake cam tubes free of charge. The recall began on september 29, 2006. Owners may contact mack at 1-800-866-1177.

Problem: On certain trucks, the fuel line crossover bracket may prematurely fail and unexpectedly fall to the road. The location and size of the bracket draws a concern to the bracket being picked up and thrown by the drive axle wheels.

Risk: If the crossover bracket falls a crash may occur without prior notice.

Fix: Dealers will replace the brackets free of charge. The recall began on august 20, 2006. Owners may contact mack trucks 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.