BearingLubricant Spray

Additives are a very important feature of modern oils and greases and can often mean the difference for successful, long term operation of bearings and other machine components. The selection of any lubricant over another should always consider additives.

Unlike unbalanced tires, shaking caused by a bad wheel bearing should be obvious from the side of the car where the bearing is failing.

We have tried to define the most important characteristics of a lubricant for our bearings so that they will provide a long service life to owners and operators of the equipment in which they are installed. Only some of the characteristics of the common oils and greases available have been briefly touched upon, leaving many more features of the various lubricants to be explained by a lubrication expert. If customers of our bearings have any questions or concerns about lubricant recommendations for their equipment, please do not hesitate to contact American Roller Bearing’s Sales Department or one of our field representatives. It is the stated policy of American Roller Bearing Company that we do not recommend a specific lubricant or even a company that manufactures lubricants. We will, however, verify that a lubricant chosen by our customers is suitable for our bearings.

Read on to learn the most common bad wheel bearing symptoms, based on my experience (50 years in the industry) and that of Joe Simes, a National Institute for Automotive Service Excellence (ASE) certified and Toyota master technician. But first, a little background.

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But sealed wheel bearings are non-serviceable and should never be repaired, only replaced. Even if a pro suggests repairing a bearing, don’t let them. Trying to reuse a damaged wheel bearing can result in an accident and severe injury.

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Lubrication is absolutely essential to the proper operation of ball and roller bearings. A proper lubricant will reduce friction between the internal sliding surfaces of the bearings components and reduce or prevent metal-to-metal contact of the rolling elements with their raceways. Proper lubrication reduces wear and prevents corrosion, ensuring long service lives for bearings.

When choosing a grease for an application, several of its properties need to be considered for the expected operating conditions. The priority of these properties is:

There are two basic types of bearing lubricants readily available: Oil and Grease. The former is fairly simple to understand, being a free-flowing liquid, while the latter is a little more complex.  In order to be a lubricant, all greases have oil that is entrained in a thickened base. It is this base that gives the impression that grease is a more viscous type of oil; however, it is the oil in the grease that does the actual lubricating. Each type of lubricant has its own advantages and disadvantages and is selected by the nature of the application. The major advantages of the two basic types of lubricants are:

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American Roller Bearing Company primarily makes heavy duty industrial class bearings that are used in various industries in the US and around the world.

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According to Simes, a failing wheel bearing will likely produce a soft, faint vibration that’s felt before it’s heard. There may also be a vague rhythmic humming or droning sound that increases over time and with speed.

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American Roller Bearing Company primarily makes heavy duty industrial class bearings that are used in various industries in the US and around the world.

For high-speed applications, jetted circulating oil is often necessary.  Nozzles inject oil directly into the bearing providing a duel function of lubrication and removal of heat. These systems are complicated and expensive and are selected when absolutely necessary.

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The average cost to replace a sealed wheel hub bearing is $350 per wheel. However, depending on the make and model, shop labor rate, the cost of the bearing itself and any additional damage, the total could exceed $1,000.

Depending on the vehicle, you can save hundreds in labor replacing wheel bearings yourself. Most auto parts stores will lend you the specialty tools and equipment needed to replace a wheel bearing.

The cage and rollers are held together inside a hardened metal ring called a “race.” The seal keeps grease in and damaging water and debris out. Wheel bearings are installed inside, and secured to, the suspension, either by press fit, bolts or a snap-ring. Once mounted, the wheel bearing rides on the axle shaft, allowing the tire/wheel to spin effortlessly.

Re-greasing intervals, that will always provide the proper amount of oil to the bearings, cannot always be accurately predicted. We do know that a proper interval is mainly a function of operating temperature, the number of hours in operation per day, and the size and speed of the bearing. Some equipment needs all the bearings re-greased every day, some once a week, some every two weeks, and some once a month. In applications such as this, it is often beneficial to completely wash out the bearings once a year, re-pack with new grease, and continue on with the established re-greasing program. Users are advised to not only inspect the condition of the old grease, but to send samples to a laboratory that specializes in analyzing used lubricants. The knowledge gained for each specific application is the best indicator of a proper re-greasing interval.

The different thickening bases have specific advantages so they may be selected for different applications. Some of their main advantages are:

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On many vehicles, the ABS sensor is built into the wheel bearing, or it’s externally mounted adjacent to the spinning part of the bearing where the sensor measures vehicle speed. Damaged from a wobbly wheel bearing, the sensor will send erratic readings to the vehicle’s computer, illuminating the ABS light.

What is the best lubricant forballbearings

Joe Simes is an ASE and Toyota master technician. After 20 years in the industry, Simes recently became a Pennsylvania Department of Education certified automotive technology instructor at North Montco Technical Career Center in Lansdale, Pennsylvania.

It is very important to select a lubricant that will provide a minimum acceptable viscosity at the bearing’s operating temperature, which will usually be between the lowest and highest reference temperatures shown above. Typically, oil viscosity numbers decrease very rapidly with increasing temperature. Determining a bearing’s operating temperature is a fairly complicated calculation that is beyond the scope of this catalog. Calculating the viscosity of a lubricant at this temperature from the lubricant manufacturer’s specifications is yet another matter. Often, previous experience with an existing similar machine will indicate an acceptable lubricant. In house testing of a prototype or the first machine can indicate operating temperatures. Most machines use a lubricant that is selected to match the most severe demand of one component in the machine such as a bearing, gear, etc.

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American Roller Bearing primarily makes heavy duty bearings that are used in various industries in the US and around the world. Not only must our industrial class bearings provide long in-service life from a rolling fatigue criterion, but they must also hold together structurally from impacts, overloads, and occasional high-speed excursions. The design of every heavy-duty bearing has been optimized to this end, including our large bore bearings.

Generally, grease lubrication is chosen if the lubrication demands of the bearing will allow it. Typical grease systems are much simpler than oil systems and do not cost as much. Often, the only features needed are grease supply holes and an external grease nipple for replenishment.

Obtaining lubrication recommendations should not be hard as there are numerous lubricant manufacturers and distributors that should have the knowledge and specifications to provide professional help. Experience learned with their products in similar equipment and/or similar operating conditions is often the best reason for choosing a brand, lubricant type for the bearings in a piece of equipment.

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On modern front- and four-wheel drive cars, wheel bearings are a set of permanently sealed, precisely machined steel ball or straight roller bearings. The balls, or rollers, are encased in a “cage” that supports the bearings, allowing them to rotate freely.

A bad wheel bearing can cause a tire/wheel to move or glide unevenly or sluggishly. It can also cause your brakes to drag, pulling your vehicle to one side when you try to stop.

NOTE: Whether you DIY or your mechanic replaces the bearing, always install a new axle hub nut. Most hub nuts are prevailing torque fasteners, used on critical components (like securing axle shafts to hub bearings) where a loose nut could lead to disastrous consequences.

In many applications, it is necessary to replenish the grease at regular intervals as the old grease will “dry out” from bleeding oil to the moving parts of the bearing, and the thickening base will oxidize. Re-greasing should be an integral part of the design of the equipment, and some bearing types already provide a re-lube feature. Good designers will provide accessible grease passages in the machine itself for getting grease into the bearing. It does very little good to push new grease up against a bearing if the old grease blocks the way. It is far better to introduce new grease in the center of the bearing and let it push the old grease out each side. If this is not possible in the selected bearing, then the grease needs to be applied to one side of the bearing while the other side of the housing cavity provides someplace for the old grease to go. Some machine designs provided a purging vent or allow the old grease to escape under seal lips. Some types of equipment employed in industries that have abrasive particles in the air use the lubricating grease as a filter media to trap these particles. Regular re-greasing of these bearings and their housings purges the contaminated grease out of the bearing housings. It is important to remember that re-lubrication should be done when grease in the bearing is still good.

Each manufacturer of a lubricant can supply a specification sheet for each of their products, and each sheet will have a list of about 20 properties and their values related to this lubricant. The most important property of any lubricant for rolling element bearings is its oil viscosity. If the specification sheet is for an oil, the viscosity values will be for the oil. If it’s a grease, it should refer to “Base Oil Viscosity” or another similar term, depending on the manufacturer. Usually, four viscosity values are shown as follows:

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You can service or replace tapered wheel bearings yourself. Never reuse any wheel bearing that’s loose, worn, noisy or shows any signs of wear.

Friction from a failing wheel bearing produces heat. After driving, without touching the tires or wheels, carefully walk around your vehicle and use a non-touch thermometer to measure if one is hotter than the others.

Next in complexity are the oil mist and air/oil systems that are designed to provide the exact amount of oil needed for lubrication, preventing excess oil that could be churned by the bearing, increasing drag and temperature.

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Simply stated, wheel bearings allow cars and trucks to run smoother and more efficiently by reducing friction and supporting vehicle weight. When they start to fail, you can usually tell.

The “Grade” level of the grease is an indicator of how stiff the grease is. Grades “0” and “1” are relatively soft and are typically used at low operating temperatures. Grades “2”, “3”, and “4” are used at increasingly higher temperatures. Grade “3” is also usually used in vertical applications to prevent all the grease from settling at the bottom of the bearing.

Absolutely not. It’s crucial to get bad wheel bearings diagnosed and replaced ASAP. If not, you could lose a wheel or get in an accident.

From a performance aspect, oil is the best form of lubrication, and it offers several types of delivery methods to the bearings. The simplest form is that of maintaining a static oil level in the bearing’s housing. In several types of equipment, such as those with gears and/or connecting rods, the oil supplied to these components creates a fog or spray that wets the bearing contact surfaces. This is sometimes called “splash lubrication.”

You’ll hear clicking, cracking, grinding, snapping, or whining noises coming from your wheels or tires. They’ll increase when accelerating or turning.

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