How Often Do You Change grease?

Posted by Mamas_Wae On Senin, 13 Maret 2017 0 komentar
When do you need to replace your lubricating grease? If you have a gigantic quantity of lubricating grease to change, it is going to flame a hole in your pocket. So most crop operators strive to protect the properties of the lubricating grease for as long as viable.

One of the most important functions of lubricating grease is to reduce the friction between the moving parts of machinery. But there are other features to look at.

When do you know that the grease needs to be changed? Below is a rough govern:

1. Viscosity has changed by 10%

2. Flash Point has dropped to 150 degree Celsius

3. Water Content has reached 2%

4. TBN, or Total Base Number has reduced by 20%

5. Insoluble Content has increased to 5% of the grease

Due to the oxidation of the grease when exposed to heat and oxygen, the viscosity of the grease tend to reduce. With the reduction of viscosity, the movie of grease between rubbing metal surfaces becomes more strenuous to maintain. This results in metal to metal contact, micro seizures that leads to scuffing, abrasion and other damages.

In gigantic diesel engines, fuel grease from dripping injectors or fuel pumps sometimes finds their route into the lubrication grease sump. This has the tendency to reduce the flash point of the lubricating grease. In addition to reducing the viscosity that is detrimental to lubrication, this contamination with fuel grease can be quite hazardous. If there is a hotspot in any of the rubbing parts, this can govern to a crankcase explosion.

Water can also find its route into the lubricating grease from leaks in the cooling water system o-rings or gaskets. In addition to reducing the lubricating properties of the grease, the presence of water in the grease can give rise to bacteria or fungal growth, which will quickly havoc the grease properties as well as contributing to acid corrosion and oxidation of the grease, changing the chemical composition of the grease itself. However, if the water content is below 0.5%, it can still be removed by centrifugal purifiers.

The total base number is especially needed for the cylinder liner lubrication of engines that run on poor standard fuel with high sulphur content. The base additive is used to reduce the corrosive effects of the sulphuric acid fumes on the cylinder.

With gigantic diesel motor installations, the lubricating oils are continuously filtered and purified to reduce the insoluble particles in the grease. exclusive strainers containing magnets are used to trap particles of carbon or iron particles. In gigantic diesel engines, the carbon particles are byproducts of combustion while the iron particles comes from rubbing of gears, cams or other parts where wear down still occur.

The presence of these particles interferes with the lubrication of bearings, most of which contain soft white-metal coating. The particles can become embedded into the soft metal and cause abrasion of the metal parts.

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