How to knowif wheel bearingis bad

202382 — The classic symptom of a bad wheel bearing is typically a cyclical chirping, squealing or growling noise that changes proportional to vehicle speed.

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How long can you drive on a badwheel bearing

Wheel bearings may not be the first item you think of when making your fleet’s maintenance checklist. There are bigger components—the engine, the tires, the safety system—that, just by their nature, demand more of your attention.

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The bearing being set too loose or too tight are the most common potential failures, but it’s worth quickly running through the others as well.

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But that does not mean that wheel bearings can be swept under the rug, as failures can lead to serious consequences, some even as severe as the truck’s wheel flying off while driving.

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“While installing, we tell the techs to make sure everything is clean, keep the bearings and all the parts in the boxes until you’re ready to work on it,” Singh recommends.

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Wheel bearings should be set between 1 and 5/1000s of an inch (0.001-in. to 0.005-in.), and ideally in the middle of those two numbers.

If the bearing has collected a significant amount of dust before installation, it can stick to the rust preventative substance on the bearing and this could lead to contamination.

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“The way to tell that it’s a high preload is that you will see wear on the large side of the roller,” he continues. “So, the rollers are tapered—imagine if you were to take a cross section: The top would be smaller, the bottom would be larger. And the wear, if it’s more on the bottom on the large side, that’s how you can tell that it’s from a high preload setting.”

A loose bearing, specifically, is what can lead to the wheel coming off while the truck is being driven—thus, the consequences can be severe both from a road safety perspective and also from a fleet liability perspective.

Fretting corrosion has a rusty appearance and can occur when the race spins or creeps inside of the hub—but, Singh notes, this is not very common at all.

“Contamination could also come from faulty lubrication,” Singh continues. “So, if the lubrication is not clean or if they did not properly flush the old one out, it could be from that, too.”

“Typically what happens is, over time, bearing setting will become loose because there’s wear and tear,” he explains. “And, if the initial setting was too loose to begin with, the more wear and tear happens, the looser it is going to get eventually. So, as you can imagine, if it’s too loose, there’s going to be a lot of excess play and vibration in the system. This could lead to a multitude of issues not limited to wheel wobble, seal leakage, ABS and braking problems. Eventually a too loose setting will cause flaking at the small end of the rollers/races leading to failure.  If damage is severe, it could even lead to the wheel coming off.”

There’s no specifically correct interval—but, for instance, when the brakes are being checked makes for a good time to check the wheel bearings as well since the necessary components are being removed anyway.

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This is a potential issue that can happen during installation. It’s not very common, as Singh notes, but possible if technicians do not use the proper pressing tools.

Overloading isn’t common and tends to be specific to certain applications—in the garbage truck segment, for instance. Sometimes you’ll see flaking across the entire raceway—it’s not towards the left or to the right, so it’s not from an improper setting, but from overloading.

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The answer to avoiding these issues is a simple one: Make sure wheel bearings are part of your fleet’s regular maintenance schedule.

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How long will awheel bearinglast after it starts making noise

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How frequently that happens, like all maintenance, depends on your application or schedule. Trucks in the refuse applications, for example, tend to need more frequent bearing replacements than their over-the-road counterparts, because of the wide variations in weights from the constant loading and unloading.

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Frontwheel bearingnoise symptoms

Misalignment occurs when the bearings are not seated properly. Improperly seated bearings will still function, but they will not have the full life of a typical bearing. That said, Singh says that this is not a common issue; however, it is possible.

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The indications are similar in each case, Singh says, but you won’t know whether the bearing is too tight or too loose until the technician opens it up to have a look.

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“Once they narrow that down,” he continues, “then they will actually inspect that side and then take the wheel end apart.. That’s when you will see this actual flaking. But, without actually taking the bearing out, you cannot see or you cannot tell how much damage has already happened.”

“If it’s tighter than one thousand,you’re running very close to preload,” explains Divjot Singh, Application Engineer at NTN. “Imagine the lubrication getting squished out below the rollers. If there’s no lubrication layer, there  will be metal on metal contact creating heat, which leads to flaking.

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Sometimes a humming or growling noise is a sign of an issue within the drivetrain. Snapping Or Clicking Noise. Most common causes: Bad wheel bearing or damaged ...

After hearing this noise, Singh says what technicians will do is isolate which side of the truck, or which axle, it’s coming from.