What kind of lubricant is used in the gearbox of the angle grinder

Lubrication process steps

Lubrication can be done in special workshops or independently. When doing self-lubrication, remember that a lubricant that does not match the brand of the tool can cause damage to the tool. The process of processing with new lubricants implies the complete removal of the old layer of grease. Parts and walls of the body must not contain remnants of the old coating.

kind, lubricant, used, gearbox, angle

Stages of lubrication of the angle machine gearbox:

  • disassemble the angle grinder;
  • wash the sides and cavities of the gearbox with kerosene or a solution of kerosene and gasoline;
  • dry the washed parts;
  • stir the new lubricant;
  • coat bearings and cavities;
  • collect tool.

When applying, the question arises: how much lubrication is required? Applying a lot of lubricant will cause excess volume to flow out during operation. With a small content, the functioning of the gearbox will be difficult and will lead to rapid failure. Consequently, such a volume of material is placed in the housing so that the teeth of the gears are hidden under the surface of the applied layer. The approximate coverage of the gearboxes of the angle grinder is less than ½ the volume of the whole gearbox.

Preventive maintenance of parts and mechanisms of the angle grinder

In connection with the work performed, in which the occurrence of stone, wood and metal dust is inevitable, as well as its ingress into the housing of the angle grinder and settling on the moving mechanical parts of the gearbox, the angle grinder needs periodic preventive inspection and is reduced to the following actions:

  • Removal of dust and larger debris from the gearbox housing;
  • Checking the presence of grease in bearings and gears, as well as the integrity of the graphite brushes and replacing them if necessary.

Popular brands of lubricants

Foreign-made gear lubricants are much more expensive than domestic ones. The Bosch brand is widely known from foreign countries. It is used to lubricate tools of the same brand, as well as other models of grinders. The coating has good performance.

From domestic manufacturers, the products of the Nanotech company are known under the name Metal Plak Electra. Lubricants of this brand are used for many components of the electric tool.

Operating the angle grinder without a lubricating coating will first lead to minor malfunctions, and then to the failure of the tool. Lubricated gearboxes will extend tool life and increase productivity. What kind of lubricant is suitable for the existing device, the master himself decides.

Getting high-quality lubricant with your own hands

If you want to use a good lubrication composition for the gearbox of an angle grinder, but there is no possibility of purchasing, then you should make it yourself on the basis of grease for the SHRUS. Do not forget that the material used must have good adhesion.

The composition must firmly adhere to the rubbing elements. The composition for CV joints is characterized by increased adhesion and the ability to work at high temperature loads.

For the manufacture of the mixture, the composition for the SHRUS and the MC-20 oil are taken to enhance the required viscosity and density. Using a homemade mixer, the composition is mixed with a small supply of oil (drop by drop).

And you can also get material from a mixture of Tsiatim-221 and TAD-17 lubricants. The main component is Tsiatim.

Angle Grinder Lubricant to keep your work running smoothly

For good operation, an angle grinder needs a lubricant that will not leak out under heavy loads and long-term operation, but will reliably lubricate the part over its entire surface during the entire operation time. It must also be environmentally friendly. Pay attention to well-known and already proven manufacturers of lubricants, such as Lubcon, Hammer, Makita, Hitachi. Experts advise, whenever possible, to choose a lubricant of the same company as your tool.

Advice! Experts do not recommend using materials such as solid oil and lithol.

When deciding how to lubricate your angle grinder, pay special attention to materials based on silicone or silicone oil. These lubricants are excellent for tools that operate at a range of speeds from slow to high speeds and under any load. They are highly resistant to oxidation, protect against corrosion, and are easily combined with plastics and elastomers. The composition contains only silicone and a lithium thickener, which makes them environmentally friendly. The consistency is maintained at temperatures from 50 to 190 degrees Celsius.

One of the most important elements of an angle grinder is the gearbox. When the tool is in operation, it heats up a lot, because it is behind it that the gears rotate, which leads to strong heating. It is for these reasons that the gearbox casing is made of metal, because it removes heat quickly enough. But the casing alone is not enough to cope with the high temperatures, and proper lubrication plays a huge role.

Each specialist, when asked how to lubricate the gearbox of an angle grinder, will answer that it is best to use a special lubricant for an angle grinder. It is specially designed for the job and the environment in which this tool is used. This grease has a specific blue color. A good quality angle grinder gear lubricant is marked as follows: MoS2 NLGI 2 ISOL-XBCHB 2 DIN 51825-KPF 2 K-20. Marking means:

  • MoS2. molybdenum disulfide acts as an additive;
  • NLGI 2. second viscosity grade;
  • ISOL-XBCHB 2. compliance with ISO standards;
  • DIN 51825-KPF 2 K-20 is the most important point, it means that the grease complies with German DIN standards.
  • 51825 indicates that the material corresponds to type K grease.

The price for such a mixture is very high, but there is a cheaper grease with similar qualities: KPF 2 K-20, where:

Hitachi G12SA Angle Grinder, Gear Lube

  • K. designed for sliding bearings;
  • P. with extreme pressure additives;
  • F. with solid filler;
  • 2. consistency complies with NLGI;
  • K. maximum operating temperature 120 degrees Celsius;
  • 20. minimum operating temperature.

Note! The use of special lubricants for the angle grinder will give the maximum guarantee of reliable operation.

Particular attention should be paid to lubricating the grinders that are under warranty. It is not recommended to do this on your own; you should entrust this work to specialized workshops. There will be used high-quality and original materials with the correct dosage. At home, you can apply the mixture incorrectly, which will negatively affect the durability of the tool.

Advice! It is recommended to take to specialized services not only angle grinders under warranty, but also those that have already passed the warranty period.

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Various lithols and greases for lubricating gears and bearings are strictly prohibited. In addition, opening the case on warranty tools will become a reason for refusing to service, and the use of “unauthorized” lubricant is generally a gross violation of the rules for operating an angle grinder. The only exceptions are external nodes, which, according to the instructions, must be regularly processed.

Work performed by the angle grinder

The angle grinder instantly gained immense popularity. Since, before its appearance, certain types of work required a significant application of both physical effort and several in their type of purpose tools for performing one type of operation.

Being, in its essence, a universal device for cutting products and materials of various hardness groups, as well as rough abrasive and grinding processing, an angle grinder easily performs the following types of operations:

  • Cutting of ferrous and non-ferrous metals;
  • Sawing of reinforced concrete, natural and artificial stone, ceramics and other materials of this group;
  • By replacing the saw attachment with the corresponding disc, you can saw wood products and lumber from different tree species with an angle grinder.

Also, the angle grinder is used for the following work after sawing:

  • Removing scale and paint from metal and wood surfaces;
  • Removal of burrs resulting from sawing materials;
  • Fine grinding and finishing of surfaces and hard-to-reach places.

Lubricant properties

The lubricating coating for gearboxes is characterized by the following properties:

  • viscosity is not more than 800 Pas;
  • drop temperature not less than 120 ° С;
  • tensile strength is not less than 120 Pa;
  • lack of mechanical impurities;
  • corrosion resistance;
  • high melting point;
  • water repellency.

How To Greasing Bevel Gear on Grinder Machine

It is necessary to select a lubricant that does not contribute to the occurrence of serifs in the areas of the contacting parts.

When choosing a coating, one should be guided by the condition that the lubricating coating for the gearbox bearing parts differs from the lubricating coating for the motor bearings.

Many people are interested in the question. how to lubricate the gearbox of an angle grinder so as not to damage the tool and increase its efficiency. The following types of lubricants are possible:

  • the brand of lubricant products corresponds to the brand of the tool manufacturer;
  • composition for CV joints;
  • grease and lithol.

Many tool manufacturers strongly recommend the use of a suitable lubricant for servicing to avoid adverse effects during operation. When using a composition of another manufacture, the instrument is not subject to warranty repair.

It will seem to many that lubricating the gearbox with the manufacturer’s composition is very expensive. After all, the cost of such materials is quite high. In addition, there are manufacturers that do not produce lubricants.

When choosing grease or lithol as a lubricant, there is a risk of causing the tool to break quickly. This is due to the fact that these substances do not imply use at elevated temperatures and high friction. Therefore, after some time, problems may arise during the operation of the tool.

Thus, the best lubrication option for an angle grinder is considered to be one that corresponds to the brand of the tool manufacturer.

Correct grease filling process in angle grinders

After the choice of lubricant for the angle grinder is made, proceed directly to the maintenance of the tool. Correct maintenance of an angle grinder consists of several steps. First you need to open the gearbox, then remove the old lubricant, apply a new one, check the correct application. Removing the old grease is necessary for the reason that mixing with new grease will prevent it from working correctly and the entire maintenance procedure will not bring any result.

When to change the lubricant in your angle grinder

The timing of the next grease change depends on the load and the intensity of use of the angle grinder. Usually it is equal to 12 months. With everyday use of an angle grinder with frequent overheating, the change frequency is significantly reduced, at least to six months.

To make sure it is necessary to add a new amount of grease, the gearbox must be disassembled by unscrewing the screws on its cover. Inside is a pair of helical gears. The small one is placed on the anchor and is used to drive the large one located on the secondary shaft. A grinding or cutting disc is attached to this shaft.

During operation, the lubricant, when the gearbox moves, scatters along the walls of the case, drying out over time and forming large lumps. The material used for a long time overheats, becomes liquid and flows out of the housing. Therefore, its volume in the gearbox decreases. If there is only a thin layer of lubricant on the gears, it needs to be added.

The grease for the angle grinder must be changed if there are dried lumps on the inner walls of the gearboxes or if there is insufficient quantity.

How much grease should be used when replacing the gearbox angle grinder

The amount of lubricant put into the gearbox must be such that the oblique teeth of the gears are completely covered by it. An excess will cause it to be squeezed out from under the cover, and an insufficient amount will not ensure the correct operation of the gearbox.

It is best to be guided by the quantity that was set at the factory by the manufacturer of the angle grinder, but remember that the lubricant can dry out, while decreasing in volume.

In this regard, it is better to put a little more and check the correct distribution of the lubricant after turning on the angle grinder. In general, the amount of lubricant is usually about 30-50% of the full capacity of the gearbox.

When to change the lubricant on an angle grinder

The frequency of changing the lubricant depends on how often and under what load the tool is used. Typically, this interval is about a year. In the case of intensive use with frequent overheating, the replacement frequency is reduced to six months, sometimes more often.

To carry out maintenance, you will need to disassemble the angle grinder gearbox by unscrewing 4 screws on its cover.

After removing the cover, you can see two bevel helical gears: a large and a small gear. The small gear is anchored and drives the large gear. The large one, in turn, is seated on a secondary shaft, to which a cutting or grinding disc is attached.

Characteristics and features of greases for grinders

When servicing any hand tool with moving parts, a lubricant is used that has the following characteristics and features:

  • It should not contain solid particles that can cause chipping of the moving parts of the mechanism.
  • The temperature at which the lubricant becomes liquid must be over 120 degrees.
  • The oil should not absorb moisture, should form a strong film that protects parts from corrosion.
  • And also, most importantly, the oil must be of such a viscosity so that it can hold onto moving parts.
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The consistency or viscosity of greases is classified according to the NLGI (National Lubricating Grease Institute), and in certain cases it is necessary to use an oil of a certain density. The viscosity of the oil is selected depending on the speed of the gearbox, the higher it is, the more liquid the oil should be. So, depending on the tool, the viscosity is selected:

  • Drills, hammer drills, jigsaws, where the gearbox has a low rotation speed. NLGI-2 grease which is soft.
  • Lightweight rotary hammers and impact drills. NLGI-1 grade, very soft in consistency.
  • angle grinder, circular saws, brushcutters. NLGI-0 grade, semi-liquid in consistency.
  • Heavy rock drills, jackhammers. NLGI-00 class, liquid in consistency.

Homemade mixes

Situations when there is an urgent need to lubricate the elements of an angle grinder are not uncommon. And at the same time, as luck would have it, there is no way to get a lubricant suitable for these purposes. Then the owner can try to make the product with his own hands from the available materials.

To ensure the required level of adhesion, a lubricant for automobile CV joints is taken as a basis. In addition to excellent penetrating properties, it can be used for operation in the following conditions:

  • significant loads;
  • high humidity;
  • temperature fluctuations in a wide range;
  • significant heating;
  • exposure to solid pollutants.

To liquefy the material and obtain the consistency required for the gearbox, it is recommended to add MC-20 oil. The liquid is introduced into the base gradually, preferably in drops, with constant stirring of the resulting composition with a mixer.

No less effective is the use of homemade material based on “Citiam-221” with the addition of TAD-17.

liquid grease for gear box of grinder

What kind of gear lubricant do you use? Have you ever made your own lubricant? Share your experience with us, please.

Angle grinder is an uncommon and rare name. You may not immediately understand what it is about. But “angle grinder” is a much more familiar word. Many craftsmen are used to working with an angle grinder. The technique copes well with grinding, cuts metal, plastic and stone products.

Both domestic and foreign models of grinders are presented on the modern market. She, like any tool, requires careful handling and care. If you choose the right tool, you can significantly extend the life of the tool. We will figure out how to do this, as well as what is important to pay attention to.

How to use?

They apply grease to the nodes for a reason. It is necessary to correctly determine where to apply it, in what order to do it, as well as how much lubricant mixture is needed. There is a maintenance plan for the angle grinder. It clearly states when to change the lubricant. This is usually done if parts break or fail.

Old grease can be identified by its appearance, it has a dirty dark color. This is caused by particles of dust, metal that get into the lubricant during the work. The outdated mix is ​​usually changed. At the same time, no traces of old lubricant should remain on the parts. And if the reason was a breakdown of the part, then you need to carefully remove all the destroyed particles that could remain in the sections of the case.

Rinsing fluids are often used to remove grease. These include often used engine cleaning mixtures. If this is not at hand, then you can always use kerosene or gasoline. After processing, it is advisable to dry the parts well. After cleaning, the process of applying grease is started. Its layer must remain thin.

The bearings should be lubricated, as if stuffing. Lubricants are simply squeezed out of the tube until they flow from the opposite side. Everyone is interested in how much lubricant should be. When applied to bearings, the amount of grease is controlled by the outflow.

But with the gearbox, the situation is different. There are certain norms for him. After all, if you overdo it with lubricants, they will leak out during operation. But an insufficient amount will not bring good results when working with your equipment.

An amount of grease is poured into the gearbox, which completely covers the gears. It is very easy to control the correctness of the application. To do this, you just need to turn on the assembled angle grinder for a short period of time. If in a couple of minutes the gearbox became hot, a leaky mass appeared, then the quantity was clearly overdone. In this case, you need to reduce its amount. To do this, you just need to disassemble the gearbox and somehow remove excess grease.

But if a loud noise appears when turning on the angle grinder, then the amount of lubrication is insufficient, and this point will also have to be corrected. It can lose its properties with prolonged use of the angle grinder. From time to time you need to check its quality. To do this, open the gearbox cover and inspect the part. If you can see dry or slightly dried areas of the lubricant, this means that you need to replace it.

Bosch

Bosch is a fairly popular manufacturer of drills, rotary hammers, grinders and other power tools. People who use devices from this brand can use their branded lubricants. They are sold in small 50-100 ml tubes. This is enough to thoroughly lubricate the gearbox 3-4 times.

If you can’t find a lubricant from Bosch, you can look for multi-purpose mixtures. Also suitable is a grease or a mixture for CV joints and an angle grinder Metabo.

Correct process of changing the lubricant in the angle grinder gearbox

Change the lubricant for the angle grinder gearbox as follows:

  • Disconnect the power cable of the angle grinder.
  • Dismantle the circle.
  • Unscrew the fastening screws and remove the gearbox cover.
  • Clean the surface from grease residues.
  • Remove the spindle with gear and bearing.
  • Rinse the parts with gasoline and dry.
  • Apply a new layer.
  • Assemble the gearbox and install it in the angle grinder.

Additional Information! If grease residues come out through the spindle, they must be removed with a clean cloth.

Process correctness control

After lubrication, check that everything has been done correctly. To do this, you will have to run the angle grinder to idle.

For reference! If the unit is quiet, the gearbox is well lubricated. The appearance of extraneous noise indicates insufficient lubrication.

Removing old grease

There are situations when old grease is difficult to remove. Most often this happens if it has not been changed for a long time. In such cases, getting rid of it with a simple rag will not work. You will have to carefully process the gearbox with gasoline and kerosene.

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What lubricant to use for the angle grinder gearbox

Angle grinders (angle grinder) are quite popular tools often used in the household. Like any other device, they periodically fail during operation. Most often this happens due to the fact that the lubrication of the gearbox for the angle grinder is dry. Therefore, people who are going to use such power tools should familiarize themselves with the features of their lubrication.

Angle grinder gearbox is the most important part on which the operation of the power tool depends

Applying a new layer

Apply a new layer very carefully and carefully. It is necessary to smear it with your hands so that the composition penetrates into all free places. It is necessary to squeeze the mixture out of the tube until its excess begins to flow from the back side of the gearbox.

Replacement periods

Many owners of an angle grinder are interested in how often the gearbox needs to be lubricated. It is impossible to determine the exact date, since everything depends on the number of loads. On average, this should be done at least once a year. If the tool is used daily, it is lubricated every six months.

Angle Grinder Gear Lubricant

The guarantee of a long life of any hand tool consists in its correct periodic maintenance. Of course, you can give it to special service centers for maintenance and diagnostics, but, as they say, “If you want to do well, do it yourself.” Therefore, it is worth figuring out how to independently service such a popular tool among home craftsmen as an angle grinder or an angle grinder, in common people.

The movable parts of the angle grinder are most susceptible to wear. These are the bearings of the armature, gears, as well as the gears themselves, which are in the gearbox. The lubricant (or lubricant) put in by the manufacturer ages over time, its properties are lost, all this leads to greater wear of the gears in the gearbox and, as a consequence, to increased vibration and the appearance of extraneous noise during operation. Periodic maintenance and replacement of the lubricant in the gearbox of the angle grinder must be carried out at least once a year.

Angle Grinder Lubricants Overview

Earlier it was said that there are many types of lubricants from both a foreign manufacturer and a domestic one. A good lubricant for power tool gearboxes is available from Bosh. It is called “Gear Lubricant” and is packaged in tubes of 65 grams. One such tube is enough for several servicing of the angle grinder.

Grease for gearbox of angle grinders of various brands

Of the lubricants intended for the gearbox of an angle grinder produced by a domestic manufacturer, we can recommend the products of Nanotech. It is called “Nanotech MetalPlak Electra” and is intended for tools that work with intense loading. And also from domestic lubricants, SHRUS or Tsiatim-221 are widely used, however, they require preliminary preparation and, in fact, are a homemade lubricant.

Correct grease filling process in angle grinders

After the choice of lubricant for the angle grinder is made, proceed directly to the maintenance of the tool. Correct maintenance of an angle grinder consists of several steps. First you need to open the gearbox, then remove the old lubricant, apply a new one, check the correct application. Removing the old grease is necessary for the reason that mixing with new grease will prevent it from working correctly and the entire maintenance procedure will not bring any result.

The procedure for applying grease to the angle grinder gearbox

Before applying a new lubricant, it must be thoroughly mixed and made sure that there are no lumps or foreign objects in it. Apply a thin layer of lubricant to the gears, making sure that it completely covers the teeth. It is more convenient to fill the grease inside the bearings with a syringe. Then the grease intended for the angle grinder is hammered into the gear housing. This is necessary for the reason that during operation it can fly off the gears and with a small amount of it, the gears will run “dry”.

How to properly remove old grease in an angle grinder

The disassembled angle grinder gearbox must be well cleaned of old lubricant. It no longer performs its functions, plus solid particles have already accumulated in it, resulting from wear of moving parts. Mixing with new, old lubricant also significantly degrades its performance. Therefore, the gearbox and gears must be thoroughly cleaned.

Remove old grease with a rag, paper towel, or just a rag. The removed parts can also be washed in gasoline or thinner. The washed parts must be thoroughly dried before assembly. Residual solvent or gasoline will mix with the new grease and change its consistency, which again will worsen its performance.

How much grease should be used when replacing the gearbox angle grinder

The amount of lubricant put into the gearbox must be such that the oblique teeth of the gears are completely covered by it. An excess will cause it to be squeezed out from under the cover, and an insufficient amount will not ensure the correct operation of the gearbox.

It is best to be guided by the quantity that was set at the factory by the manufacturer of the angle grinder, but remember that the lubricant can dry out, while decreasing in volume.

In this regard, it is better to put a little more and check the correct distribution of the lubricant after turning on the angle grinder. In general, the amount of lubricant is usually about 30-50% of the full capacity of the gearbox.

Characteristics and features of greases for grinders

When servicing any hand tool with moving parts, a lubricant is used that has the following characteristics and features:

  • It should not contain solid particles that can cause chipping of the moving parts of the mechanism.
  • The temperature at which the lubricant becomes liquid must be over 120 degrees.
  • The oil should not absorb moisture, should form a strong film that protects parts from corrosion.
  • And also, most importantly, the oil must be of such a viscosity so that it can hold onto moving parts.

The consistency or viscosity of greases is classified according to the NLGI (National Lubricating Grease Institute), and in certain cases it is necessary to use an oil of a certain density. The viscosity of the oil is selected depending on the speed of the gearbox, the higher it is, the more liquid the oil should be. So, depending on the tool, the viscosity is selected:

  • Drills, hammer drills, jigsaws, where the gearbox has a low rotation speed. NLGI-2 grease which is soft.
  • Lightweight rotary hammers and impact drills. NLGI-1 grade, very soft in consistency.
  • angle grinder, circular saws, brushcutters. NLGI-0 grade, semi-liquid in consistency.
  • Heavy rock drills, jackhammers. NLGI-00 class, liquid in consistency.