I am a maintenance mechanic for a large trucking firm. On 4 oct 2011, I checked the torque on the 5th wheel bolts of unit 11054 because I could see that the 5th wheel was sliding on the frame. The bolts were defective - yielding prior to reaching the recommended torque of 236 ft.Lb. I adjusted the torque wrench to 200 ft.Lb., Its lowest setting, and could not get any of the bolts to hold. I replaced all ten bolts with 5/8" grade 8 hardware instead of the factory 16mm 10.9 Metric because that was all we had available. There was no interference between the 5th wheel bolts and the huck rivets on the frame rail. The bolts were weak. *Tr
2010-2011 · 2 model years
Mack CXU612 Problems by year
Owners have filed 7 complaints about the Mack CXU612 across 2 model years, and it has 0 recalls. The 2010 has the most complaints once its age is allowed for (6). The most reported problem area is the equipment & accessories, followed by the body, doors & structure.
- Complaints
- 7
- Recalls
- 0
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
CXU612 complaints by model year
Highlighted: the year with the most complaints for its age. Older vehicles have had more time to collect complaints - the Safety Index grade allows for that.
Most common CXU612 problems
Latest CXU612 complaints
The 5th wheel mount bolts on my company's 2010 and 2009 mack trucks are stretching and becoming loose. I saw unit 10101 on sunday, 20 march 2011 on our yard ready to hook up. I had finished my shift and was walking past the unit when I reached out and turned the bolt by hand. *Tr
I am a mechanic for a large trucking firm. I have been complaining about the 5th wheel bolts on our 2008, 2009, and 2010 mack trucks for two years now. The company has yet to implement a program to correct this matter, instead choosing to threaten me with disciplinary action for pointing out loose bolts on our road tractors. Today (03/15/2011) I passed a 2010 tractor on the ready line. It was unit #10289 with only 76327 miles on it. The 5th wheel plate had been shifting on the frame and all of the fastening bolts...
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were rusty. The two bolts that I checked turned easily by hand - rattling loose. The bolts were not hitting any thing that might have loosened them, they had stretched. The shop foreman on duty was the one who had told me that I was "out of line" to look at trucks that I did not have a work order on, so I did not risk telling him. The head of our safety department at the general office had told me that "the company is handling it and for me to leave it alone" so I am reporting it to the odi. The 5th wheel bolts are loose. *Tr
Mack has been selling over the road trucks with substandard bolts holding the 5th wheel to the frame. As a mechanic with abf, I am seeing trucks every day with 5th wheels that are loose. On 22 september 2010, I worked on unit #10222 at the little rock shop. This truck had only 4376 miles on it and I could turn the 5th wheel bolts with one hand using a 10 inch combination wrench. I tried to torque the bolts to specs, but they only stretched. I replaced the bolts with aftermarket bolts which tightened normally. *Tr
As a mechanic contracted to maintain abf road tractors, I worked on unit 10064 on 9/22/2010. I discovered that the 5th wheel mount bolts were all loose. This truck had only 51,285 miles of service pulling pup trailers! I removed the bolts to make sure there was no thread damage, lightly oiled them, and attempted to torque them to mack specs of 235 ft.Lbs. Torque. None of the bolts would tighten properly, all of them stretched. I replaced all of the bolts and tagged the defective bolts for mack warranty. As a...
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citizen who expects the highways of the united states to be safe for travel, I am asking the odi to find out why all of the macks delivered to abf have defective 5th wheel mount bolts and to find out if the macks delivered to more demanding customers ( such as loggers, gravel trucks, concrete trucks, and tandem axle full trailer load truckers ) are also assembled with inferior quality fasteners that fail prematurely. *Tr
I am a mechanic for abf freight system. I have observed that many of the mack trucks we use in our road fleet have premature failure of the fasteners holding the 5th wheel coupler to the truck frame. I worked on unit 10016 on 9/21/2010 and checked the 5th wheel bolt tightness as a follow up to complaint #10356665. The bolts were loose after only 63,450 miles of service. I tried to tighten them as I had previously been ordered to do but the bolts only stretched. I replaced the 5th wheel bolts. The old bolts that had been tightened were visibly stretched. *Tr
Questions about the Mack CXU612
Which Mack CXU612 years have the most problems?
What are the most common Mack CXU612 problems?
Across every model year, owners report problems with the equipment & accessories (6), body, doors & structure (4), suspension (2) most often.
How many recalls does the Mack CXU612 have?
NHTSA lists no recalls for any Mack CXU612 model year on file.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked daily. Complaints are owners' own reports and are not verified. How we use the data