Archive for April, 2013

The Hazards of Counterfeit Bearings

Friday, April 26th, 2013

Where there are premium products, there are always rip-offs. Some are downright ridiculous, while others pose serious life threats, bearings being one of those. A lot of things in our daily lives rely upon bearings. Fake bearings could put businesses, and God forbid, lives, at risk.

Counterfeit bearings may resemble the real deal, but performance-wise, they are by no means similar. It’s a current problem across the globe these days, and counterfeiters make a lot out of this.

The World Bearing Association’s awareness campaign displays the problems and safety concerns caused by rip-offs. Watch the video for the full story on just how dangerous fake bearings could be.

 

What Are The Symptoms of Worn Wheel Hub Bearings?

Friday, April 19th, 2013

The symptoms of worn wheel hub bearings differ in terms of severity. Some are hard to detect, and this causes further damage when immediate action is not taken.

Noise is a typical sign of a bad wheel bearing. Here are some other signs of a worn wheel hub bearing or other wheel-end damage:

  • Snapping, clicking or popping
  • Grinding when the vehicle is in motion
  • Knocking or clunking
  • Humming, rumbling or growling
  • Wheel vibration and/or wobble
  • Shudder, shimmy or vibration at a constant speed
  • Abnormal side pull when brakes are applied
  • Uneven rotor or brake pad wear
  • Abnormal or uneven tire wear
  • ABS failure, which could be internal or external to the bearing or hub bearing assembly

Take immediate measures in the event you observe any of the indicators that are mentioned in this post. Otherwise, you may end up losing steering control or have wheel separation, among many other serious mechanical failures. It is imperative to always do proper maintenance and handling procedures.

You should always see to it that you follow every installation instruction and maintain proper lubrication while you’re at it. Keep in mind to never spin a bearing with compressed air. The rollers could be forcefully expelled.

Bearings for Screw Compressors

Saturday, April 13th, 2013

Bearings for screw compressors are utilized in areas where they are incessantly exposed to certain chemicals like ammonia gas, refrigerants, and compressor oil. That said, they must be particularly resistant to heat and oil. Did you know that there are bearings for screw compressors that have linear polyphenylene sulphide (L-PPS) plastic cages? They feature tiptop quality chemical resistance and deliver high performance no matter the environment.

Some of the features of bearings for screw compressors include: L-PPS plastic cage; increased load capacity; increased axial load limit for angular contact bearings; as well as improved lubrication performance. The plastic cage features high quality heat and wear resistance, cage strength, and chemical stability characteristics that get affected only very minimally even when exposed to harsh elements or chemicals. The optimal bearing internal design with L-PPS plastic cage paves way for higher bearing load capacity, which is caused by an enhanced fatigue rating life. More to these, axial load limit is increased along with higher load capacity. Also, the optimal design of the cage makes use of the rolling elements to guide cages rather than of by the inner and outing rings. Therefore, there is more internal space and the lubricant flow is enhanced throughout the bearings.

Bearing maintenance and inspection must be done regularly. That way, you boost the lifespan of the bearing. Also, doing so will prevent mechanical failure, guarantee reliable operation, increase productivity, as well as improve cost performance.

Periodic maintenance is required, and it depends on the machine operating conditions. Thus, you should always monitor such operating conditions, change lubricant, as well as disassemble and overhaul the machine from time to time. Furthermore, see to it that the bearing is thoroughly examined during inspection to be aware of any need for part replacement. The specific way of going about this is by checking the lubricant properties, the operating temperatures, and any bearings noise or vibrations.

Inspection points include: bearing noise; vibrations; temperature; and lubricant condition. You may opt for sound detection instruments to be sure about the volume and characteristics of certain noises. It can reveal certain bearing damages like slight flaking. The three usual noise conditions are loud metallic sound, loud regular sound, and irregular sound.

Thanks to NSK for this helpful information!

There is oil separation in my grease. Is it still OK?

Friday, April 5th, 2013

Yup, you can still use it. Some oil separation or puddle formation that you may observe on top of grease in containers like drums or pails are not unusual, so no worries there. Keep in mind that grease lubricates a bearing by means of oil to the bearing contact. That said, releasing oil is a necessary function.

For the most part, the amount of oil separation is not very important when compared with the mass of grease in the container. Typically, you can safely stir back the separated oil into the bulk of the grease in the pails or drums. It has been observed that you can lessen most of these time-related oil separations if you keep the surface of the grease smooth during storage (i.e., avoid leaving “craters” in the grease).

The grade or consistency of the grease is actually linked to oil separation. The lighter the grease grade, the more likely it will become to oil bleed. Lastly, oil bleed can be affected by large fluctuations in storage temperature. Therefore, you must always keep storage temperatures as consistent as possible.