In cold climates, the reaction rate may be too slow to generate enough pressure, while in warmer temperatures, the reaction may work too well, injecting too much grease into the housing.

As the gas expands, the force causes a diaphragm to push grease into the housing. Like spring-activated auto-lubers, ambient conditions greatly influence how effective gas-activated auto-lubers work.

Some single-point lubricators can be used with divider blocks to distribute lubricant to as many as sixteen lubrication points nearby. These can be particularly helpful in applications such as conveying systems where many grease-lubricated pillow block bearings can be found at the head or tail of the conveyor.

But they are not and never will be, an excuse for laziness or no maintenance. Choose them carefully, inspect them regularly, and never “set it and forget it.”

When it’s time to shop for a new wheel bearing, AutoZone has all the parts and tools you need to keep your car rolling, and we have locations in every state that you can find by using our Store Locator.

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In mobile applications, using a central greasing system to lubricate pins and bushing can also help to purge contaminants out of the bushing. This is particularly useful in off-highway applications where high dust and dirt ingression can cause significant wear problems.

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Automatic lubrication systems range from simple single-point lubricators to large, complex multiline systems that lubricate hundreds of individual lubrication points. While some are designed just for grease, others can be used with either oil or grease, offering flexibility to accommodate various scenarios.

But is there a better way? Sometimes, the answer is a resounding “yes” using single or multipoint automatic lubrication systems.

The simplest type of automatic lubricator is the single-point auto-luber (Figure 2). As the name implies, the automatic lubricator is connected to a single point, often a pillow block or other bearing housing. Single-point auto-lubers are commonly used with grease and are a good option where safety concerns preclude manual lubrication.

Likewise, changes in ambient temperatures can affect both the lubricant viscosity and grease consistency, resulting in under or over-lubrication.

Perhaps the biggest downside to automatic lubrication is the false sense of security or a so-called “set-it-and-forget-it” mentality. Left unattended and uninspected, automatic lubrication systems can stop working, become plugged, or run empty.

You may find that the car wanders on the road, your tires may wear unevenly, the friction heat from the failed bearing could damage other parts of the car, and the wheel could actually separate from your car.

In most industrial facilities, many lubricant application tasks are performed manually using either a grease gun, an oil can, an oil top-off container, or an aerosol spray.

In automotive applications, the wheel bearings are usually sealed units that connect the wheel to the suspension of the vehicle. Your wheel studs will typically be part of the bearing and if it is a drive wheel, there can be a hollow in the middle of the bearing where a spindle is inserted from the axle shaft.

Your safety should always come first. Learn the safest way to use wheel chocks and how to keep your stationary car from rolling.

Once you’ve done the road test and have an idea of where the sound is coming from, park your car, jack it up, and remove the tire. Don’t forget to use jack stands! With the tire off, rotate the bearing to see if there is undue resistance or if you can feel or hear clicks, grinding or other sounds coming from the bearing. It should be smooth and quiet. You can also try to wiggle it back and forth and there shouldn’t be any play in the bearing.

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Used judiciously, the case of automatic lubrication is clear. Whether to ensure that just the right amount of lubricant is supplied at the right time or to help ensure that we don’t expose our lube techs to unnecessary safety risks, automatic lubricators can play an essential role in any lubrication program.

Conversely, the bearing may be under-lubricated as we reach the prescribed relubrication interval. With automatic lubrication, we can add a smaller amount of lubricant over a shorter time interval, helping always to maintain an amount closer to the ideal quantity (Figure 1).

Mark has over 25 years of experience in the fields of lubrication management, oil analysis, and contamination control, and has published more than 190 technical articles and whitepapers. He is frequently invited to share his subject matter expertise at conferences around the globe and has worked with a number of blue chip companies, including Chevron, DuPont, Alcoa, ExxonMobil, Goodyear, Cargill, International Paper, General Mills, and the U.S. Army to extend asset life through precision lubrication. For numerous years now, Mark Barnes leads Des-Case’s reliability services team, helping customers identify opportunities for improvements to their industrial lubrication programs through training, consulting and product solutions. Prior to joining Des-Case, Mark was Chief Technology Officer and Vice President of Services for Noria Corporation. Mark holds a Ph.D. in physical chemistry from the University of Southampton in the United Kingdom and is a Certified Maintenance and Reliability Professional (CMRP).

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Since the wheel bearing is the sole point of contact between the car and the wheel, it’s very important that it is functioning properly. A bad bearing will be noisy, could lead to heat damage of other components, and could seize up or cause the wheel to break off the car, leaving the driver stranded.

Automatic lubrication systems vary widely in design and layout. However, they all offer similar positives while having some very real negatives if they are not properly selected, installed, and maintained.

The supply line is pressurized and primes and fires the first valve. This, in turn, primes and pressurizes the second valve, and so on Figure 4). Series systems can be used over a slightly longer distance since they carry more pressure to a single lubrication point.

The most reliable single-point lubricators use a motor and positive displacement pump to inject the lubricant. These can be hardwired or battery-activated and generate hundreds of PSI of pressure. In some cases, they can also be connected to the plant’s PLC and DCS system to stop pumping if production shuts down.

Wheel bearings have come a long way since the days when you had to repack them every several thousand miles, but they still do fail on occasion. Keep reading to learn how to identify a bad wheel bearing by the sounds it makes and what to do to avoid a wheel bearing to go bad.

Perhaps the most significant benefit of automatic lubrication is ensuring that a bearing or other lubricated point receives the optimum amount of lubricant.

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Multipoint automatic lubrication systems are used for distribution across a wider area. Multipoint systems can be divided into two general categories: parallel (non-progressive) or series (progressive).

Your symptoms do sound like a camshaft on the way out. The best way to check 100% is to pull the valve cover and inspect the lobes.

So, too, thickener type should be considered. Some thickeners have a higher bleed rate than others, causing grease to separate in a multipoint lubrication system. This can result in plugged lines and a lack of lubrication.

Wheel bearings have come a long way since the days when you had to repack them every several thousand miles, but they still do fail on occasion. Keep reading to learn how to identify a bad wheel bearing by the sounds it makes and what to do to avoid a wheel bearing to go bad.

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Start by listening for clicking, humming, or growling noises and feel for vibrations through the steering wheel. If you can pinpoint where the noises are coming from, the next step is to remove the wheel and do a physical inspection.

Frontwheelbearing noise symptoms

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The simplest form of single-point lubricator uses a spring and plate design. By filling the reservoir, the plate compresses a spring. Over time, as the bearing rotates, the force created by the compressed spring in conjunction with the centrifugal force of the rotating bearing causes grease to be injected into the housing.

Aside from optimizing lubricant volume, automatic lubrication can also help in applications where it is difficult to access the lubricated component safely during normal operation.

Like the single-line parallel system, a dual-line system has two lines that pressurize and de-pressurize the system to feed multiple lubrication points through adjustable injectors.

Back in the days of horses and carriages, wheels were attached to the carriage by way of a wooden or metal stick axle that was fixed to the carriage, requiring the wheels to rotate on the axle. A major drawback of this setup was that there was a lot of friction between the wheel and the axle, and that friction made it harder to move the carriage, resulting in wasted energy. The other issue was that the friction would cause a lot of wear and tear on the axle and wheel where they joined, so you’d need to do constant maintenance on the joint.

Precision Lubrication magazine provides timely, in-depth news and insights on lubrication, maintenance, and reliability. Each issue delivers solid guidance, tools and information you can use right away at your facility.

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The valve blocks are often automatically monitored for pressure and alarmed to ensure the system is still functioning. The biggest drawback for any series system is the progressive nature of the system, whereby any valve failure early in the series will result in no lubricant being dispensed further down the line.

We also know that sometimes you just don’t have the time to do the job yourself, so allow us to help you find a qualified professional mechanic through our Shop Referral Program.

Most units can be adjusted to vary the quantity and frequency of lubricant and come in different designs that use either a prefilled cartridge of grease or a grease zerk for refilling.

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Done correctly, manual lubrication can be an efficient and effective way to keep smaller equipment running reliably while also allowing us to inspect the asset easily at the same time.

In non-progressive systems, a pump pressurizes a supply line with lubricant. Divider blocks connect the grease supply line to individual application points, which can be uniquely adjusted to dispense different quantities of oil or grease (Figure 3).

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There are a few things to listen and feel for when attempting to diagnose a bad wheel bearing. Some of the sounds that we associate with bad bearings can also be indicators of problems with other parts of the vehicle, but there are a few tricks to test whether the noise is a bearing issue. Here are a few sounds that can indicate a bad bearing:

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Spring-type auto-lubers are probably the most unreliable. Over time, the spring may weaken or break, or the force generated may be too low to inject grease into the housing effectively.

Your wheel bearings impact efficiency and keep the wheels attached to your car, so it’s important to use the best possible parts to complete any repair. Replacing your own wheel bearings can be an afternoon or evening job, depending on the make and model of your vehicle, so do a bit of research and don’t be afraid to tackle this important repair yourself.

Be sure to consult your owner’s manual, a repair guide, an AutoZoner at a store near you, or a licensed, professional mechanic for vehicle-specific repair information. Refer to the service manual for specific diagnostic, repair and tool information for your particular vehicle. Always chock your wheels prior to lifting a vehicle. Always disconnect the negative battery cable before servicing an electrical application on the vehicle to protect its electrical circuits in the event that a wire is accidentally pierced or grounded. Use caution when working with automotive batteries. Sulfuric acid is caustic and can burn clothing and skin or cause blindness. Always wear gloves and safety glasses and other personal protection equipment, and work in a well-ventilated area. Should electrolyte get on your body or clothing, neutralize it immediately with a solution of baking soda and water. Do not wear ties or loose clothing when working on your vehicle.

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While parallel systems are inexpensive, they have some drawbacks, most notably a limited distance range, particularly in cold climates. At the same time, each injector needs to be periodically inspected and tested using a grease gun to ensure both the supply line and injector are functioning.

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The first caged bearings for axles were patented in the late 1700s, and the design that has carried forward to modern times is basically a set of steel balls or rollers that are housed within a ring-shaped housing called a race. Most ball bearings will have an inner race, which is grooved and holds the balls on the inside, and a grooved outer race on the outer circumference of the bearing. In a roller bearing, the race has slots that allow the rollers to spin against the axle on the inside and the wheel on the outside.

Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Information is accurate and true to the best of AutoZone’s knowledge, however, there may be omissions, errors or mistakes.

Automatic lubrication systems are not foolproof. They must be inspected, topped up, tested for obstructions or failed injectors, and properly maintained. Likewise, we need to consider the viscosity of the oil or thickness of grease to be used, particularly at very high or low ambient operating temperatures.

Some of these symptoms can also be a result of bad tires, or even a bad CV joint, but a bad bearing will sound worse when it is put under load, like when the car is turning, so use this method to test and see if it is your bearing that’s causing the noise:

In applications where oil or grease has to be dispensed over large distances or where high-viscosity oils or thicker greases are in use, it is common to use a dual-line parallel system.

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If you catch a wheel bearing right when it starts to fail, you probably will have enough time to get to the shop or your home and do the diagnosis and repair. Be aware that driving at highway speeds will intensify any bearing issues and could lead it to fail faster, so be prudent with your route.

Click to learn the signs and symptoms of a bad steering column, how it can affect your steering, and how to repair it with AutoZone.