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The Shocking Truth About Truck Rollovers

In my last blog I ended with the thought that I would look at crowd funding for university research. This blog is about that, but you have got to get though the following idea to get to that idea.

As you may have gathered from my prior blogs, I have taken an interest in all things related to the wheel end, including tires and wheels and because of this blog, I recently got involved with a company that wants me to use my skills to get the word out about a facet of wheel end maintenance that many ignore or totally misunderstand.

As always, my first step is to consult the Technology & Maintenance Council Recommended Practices (TMC RP’s) related to the subject. I followed that by in the field hands-on research, set up Google alerts, and survey current trade magazines and blogs on the subject matter. I also saw the company’s presentation on the subject several times to learn their prospective on the issue.

Part of the company’s presentation is related to truck rollovers. The premise of the presentation is that by the time a commercial truck tire is worn out, the shock absorber is also worn out. Changing a tire without changing the shock would be like changing the oil in your car without changing the filter; it doesn’t make a lick of sense.

I am a big believer in the TMC RP system, but no pun intended. I was shocked to learn the status of the RP (RP643) that supports this company’s position on the above premise--that when replacing a worn-out tire one should assume that the shock is at the end of its useful life of protecting other components from damage and allowing the driver to maintain control of the vehicle during accident avoidance maneuvers. The shocking thing about RP 643 is that the current valid RP was released in June of 2000. There is an update from 2007 that went part of the way through the TMC RP approval system, but was never released. The good news is that there is a task force meeting to resolve any issues related to the acceptance of the 2007 version of the RP. Here is a quote from the RP:

“Shock absorbers used on air-ride or taper-leaf suspensions for on-highway vehicles should typically provide effective dampening control for 150,000 miles (100,000 miles for vocational applications). Beyond this point, greater consideration should be given to the effectiveness of the shock’s dampening value due to performance deterioration. At some point this deterioration could have an effect on other components. For example, tire wear can be attributed to worn shocks. Because of this, some fleets have found it beneficial to install new shocks when installing new tires so as to maximize tire life.”

So the company’s position is supported by a TMC RP and makes sense.

During my field research I learned firsthand that many tires are changed with no regard to shock replacement. Many truck operators think inspecting the shock is to look at it and if it is still there and not leaking, it is okay. I have asked many truck operators, “Would you not change your oil filter just because it is there and not leaking?” Of course you know the answer is, “Are you nuts?” You need a working filter to protect the engine. Do you need a working vibration filter (the shock) to protect your driver and vehicle?

I got home from my field research and find this front page headline in a trade magazine:

“Speed, Lack of Seat Belts Cited by U.S. in Truck Fatality Spike”.

Here is a quote that stimulated the writing of this blog:

“Wearing your seat belt and not having a rollover are two very important components of not perishing in a truck crash.” Nowhere does it say in the article that the powers that be, are looking at the condition of the key component that allows the driver to maintain vehicle control – the shock! As Big Truck TV thought leaders, let’s do some research in the area of shocks, rollovers, and current maintenance practices. Or is it time to do something more drastic?

Here is another headline that awaited me,“Schneider’s Osterberg Urges Stronger Links Between Research and Business Applications” with my favorite quote, “Oftentimes, the research community says, ‘We do research, and the bridge to implementation is really out of our scope.’”

I have been directly involved with university research related to transportation issues and not only agree with the above statement but would add that this is just the tip of the iceberg.

Because of my recent consulting project I have not had the time to look into crowd funding for university research like I wanted to. However, I would like to start a project at Auburn University that would equip a lab to independently study the truck rollover issue, especially as it relates to the condition of the shock absorbers. What fleet or owner operator would allow shocks from a vehicle rollover to be sent to a university to study if poor maintenance practices caused a fatality and a program of replacing shocks per a recommended practice would have saved a life? Could a joint industry, university, and government research project overcome all issues (imagine just the legal angle) and get to the bottom of shock maintenance issues?

I think for my next blog I will report how on low rolling resistant tires (LRR) interact with shocks and internal balancing agents for longer tire life. I have some field reports that some fleets are experiencing huge reductions in tire life with the LRR tires. I think this would be a great area for mutually beneficial crowd funded research; maybe my next blog will get the ball rolling.

SPOKANE, Wash. - A Schwans delivery truck was driving northbound on Perry near Wild Rose Rd. The truck moved to the side of the road to allow an oncoming car to pass when the truck caught the shoulder and rolled over. Would new shocks have prevented this? Would a stability system made a difference?

Regarding LRR truck tires and claimed shortened tread life, facts overide speculation. After 40 years in the tire businss and personally tracking tire milage, I would have to see the data and method in gathering those facts.
Norm Ball, Ball Tire Industry Consultants, LLC, www.Tireanalyzer.com

I wonder about cross winds, trailer side skirts, worn out shocks and overcorrecting as being a deadly combination:

No Injuries Reported in Fiery Cement Truck Rollover

A cement truck wreck that caught fire in Madison County Wednesday afternoon caught the attention of many drivers along FM 39.

Investigators say the truck ran off the highway about a mile south of North Zulch just before 3 p.m. Law enforcement officials say the driver overcorrected after wind blew his truck. It then rolled over and caught fire. The driver was not injured and firefighters were able to put the fire out quickly.

http://www.kbtx.com/news/local/headlines/No-Injuries-Reported-in-Fiery-C...

Chet,

Thanks for your kind words. I guess I should start my book. The working title is The Past, Present and Future of the Commercial Truck Wheel End and Tires.

Chapter One might be Wheel End ABC’s

A = Air Pressure and Alignment

B = Balance--I still don’t get why TMC doesn’t recommend zero out-of-balance as the recommended wheel end spec. Don’t they know the future is already here with Counteract Balancing Beads?

My blog on balance:

http://blog.bigtrucktv.com/bobrutherford/do-you-have-balanced-tire-program

C = Control for suspension and shocks

Your technology would be in the section on the future unless like Yogi Berra observed, “The future isn’t what it used to be”.

I read somewhere TMC is working on an RP related to using the air pressure charts because of CSA* requirements. Should a trucker who is running 100 PSI in his tires get ticketed for having one at 80 PSI, if according to the chart it is the only one at the correct PSI? Compared to the 100 PSI tires the 80 PSI is 20% underinflated and is a violation of the rules.

My policy on commenting is not to comment, hoping others will participate and say what I would have said. I made this comment just to let everyone know in what direction I am heading.

Thanks,
Bob
BobRutherford@aol.com

* Federal Motor Carrier Safety Administration (FMSCA) Compliance, Safety, and Accountability Program (CSA)

Bob'

I was a mechanic in a fleet of 750 vehicles, ranging from cars to 18 wheel trucks. for 20 years. I am retired now , but I learned many things while in that capacity. On the subject of rollovers, three things stuck with me. They are tire failure, improper loading, and the driver going to sleep at the wheel. As for shocks, if they are doing their job and dampening the shock, they are ok. The better the tires are balanced, the longer the shock absorber will lact. I am retired, but I still travel on the Texas Freeeways and you wouldn't believe how many trucks I encounter with the tires so out of balance that they actually leave the ground every half rotation. This causes extreme tire and suspension system wear. Just aanother bit of data for you to research.

Bob, thank god that people like you exist, with your foresight, understanding, and get up and go. You haven't said anything about the company that 'employed' you (contracted), but, I believe that you are on a good track, although, it's not the complete track. As you know, we promote correct tire pressures should also be the basis for every truck on the road. The wrong tire pressure, typically over inflated, often severely over inflated tires not only amplify every road irregularity, defeating the job the shock is meant to do, but also significantly adds to shock absorber wear and tear, significantly reducing it's life, and the suspensions life. Excessive tire pressure also increases shock temperature, reducing it's abilities. If you have not investigated the load to inflation tables provided by the US Tire and Rim association, plus every reputable tire manufacturer, please google Michelin load inflation tables. You will see what I am talking about.
The next problem is there are shocks and there are shocks. Most shocks are made to a price. They are barely able to do their job when new. And, many transport people buy on price only. As Australia has many rough roads, their are some amazing shock developments down here. Email me at chetcline@hotmail.com if you want more info on any of this.
Shocks, shock quality, and tire pressures are integral to good truck handling. Cheers. Chet

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