What Kind Of Lubricant Is Better To Use For The Gearbox Angle Grinder

Main Features of Lubricant for Angle Grinder

In angle grinders, the main unit subject to the greatest loads during operation is a gearbox consisting of helical gears.

The torque generated by the angle grinder rotor is transmitted from the rotor to the working tool through the small helical gear to the large helical gear. Correctly selected gear lubricant significantly reduces friction force and heating temperature.

The grinder uses bearings, which also require periodic lubrication. This is especially true for the spindle bearing of the large helical gear.

A lubricant that meets not only the listed requirements, but also environmentally friendly is suitable.

Lubricants for an angle grinder must have certain characteristics and must be of the required consistency in terms of properties.

The lubricant for the gearbox of the angle grinder must have:

  • Viscosity no more than 800 Pa·c;
  • Dropping point not less than 120ºFROM;
  • Ultimate strength not less than 120 Pa.

Lubricant for an angle grinder should not have mechanical impurities, be resistant to corrosion, adhere firmly to lubricated parts, not melt at high temperatures, prevent the formation of scoring at the contact points of parts and, of course, have water-repellent properties.

An angle grinder of any company uses two types of plain bearings: bearings for the electric motor and support bearings for the gearbox.

The selection of grease for the bearings of an electric motor is different from the selection of grease for the gearbox bearing. It’s all about different working conditions.

Bearing Grease Angle Grinder

The design of the angle grinder has three bearings. Two bearings are mounted on the rotor of the tool, one bearing is mounted on the shaft of the driven helical gear of a larger diameter.

The angle grinder uses bearings already filled with grease. But from improper operation, overheating of the tool, grease flows out.

How to choose the right bearing grease for your angle grinder?

The bearing grease must meet the following requirements:

  • Increase sliding;
  • Reduce friction between component parts of parts;
  • Evenly distribute heat and act as a coolant;
  • Prevent the occurrence of corrosion;
  • Protect from dirt and dust getting inside;
  • Work in the required temperature range up to 150C;

The operating conditions of the electric motor bearings differ from the operating conditions of the gearbox bearing, not only because of the temperature requirements, but also because of the operating modes, load modes, frequency and speed of rotation.

The grease for the bearings of the electric motor must have protective properties that prevent the ingress of dirt, dust and moisture on the bearing parts.

The Russian market offers a wide range of foreign greases designed for bearings operating under different conditions. But their cost makes us look for cheaper, not inferior in quality, domestic lubricants.

Among domestic lubricants, we recommend paying attention to the Tsiatim-221, VNIINP-246 (GOST 18852-73), VNIINP-235 lubricants.

Well proven lithium greases.

Possessing high water-repellent properties, they have a wide temperature range. The role of a thickener in them is played by organic and inorganic substances. For sealed bearings, it is best to use CIATIM-203, VNIINP-242 greases.

Of pigment lubricants blue grease VNIIMP-246 and dark purple ointment VNIINP-235 are widely used for electric motor bearings. The first grease is less common than the second one due to its high price.

In today’s Russian market, domestic manufacturers of lubricants are represented in a wide range of products.

Do-it-yourself angle grinder grease for gearbox

Although the listed lubricants of domestic production are affordable, they are not always at hand.

Is it possible to make a lubricant for the gearbox of an angle grinder with your own hands?

And there is an affirmative answer to this question.

Since the main technical characteristics of lubricants for gearboxes of an angle grinder are presented above, they can be taken as the basis for drawing up a lubricant of the desired characteristics with your own hands.

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Homemade gear lubricant should be based on a highly adhesive grease. It must hold firmly to the touching parts.

Grease for CV joints has increased adhesion. CV joint is a joint in a front-wheel drive vehicle that works in conditions of increased pollution, shock loads, temperature fluctuations and humidity.

Taking the lubricant for CV joints as a basis, it is necessary to add liquid lubricant (MS-20) to give the mass the desired consistency. Oil MC-20 should be served drop by drop, thoroughly kneading the mass using a homemade mixer.

Good results are obtained by a mixture of a mixture of Tsiatim-221 and TAD-17 lubricants, where Tsiatim is the basis.

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

If the amount of grease in the bearings is controlled by flowing out from the back side, a certain amount of grease is packed into the gearbox of the angle grinder. Excess grease will leak out during operation. And a small amount of it will not ensure high-quality operation of the gearbox.

Leave as much grease in the gearbox as needed to cover the gear teeth.

Apply enough grease as a guide so that it occupies slightly less than half the volume of the gearbox cavity.

Lubricants recommended by foreign tool manufacturers

Foreign tool manufacturers, including an angle grinder, recommend specially formulated ointments as lubricants for grinders.

One of the most widespread foreign lubricants is a grease marked MoS2 NLGI 2 ISOL-XBCHB 2 DIN 51825-KPF 2 K-20.

  1. Mos2 indicates a filler material, in this case molybdenum;
  2. NLGI2 indicates a second viscosity grade;
  3. ISOL-XBCHB 2 belonging to ISO standards;
  4. DIN 51825-KPF 2 K-20 grease manufactured according to German DIN standards;
  5. The numbers 51825 mean that the grease is type K.

Lubricants produced with such characteristics are quite expensive. There are imported, less expensive lubricants on the Russian market.

Each tool manufacturer, be it Bosch, Makita, Hitachi, DeWalt, Metabo, RedVerg, Interskol, E256, LEPSE, recommends its own lubricants. This is the manufacturer’s policy. They insist that the lubricants specified in the instructions are used when performing maintenance. over, non-compliance with these recommendations does not allow performing warranty repairs.

Makita angle grinder grease is available in tubes. Its high cost is commensurate with the high quality and long life.

Correct grease filling process in angle grinders

Packing grease into the units of an angle grinder has its own rules. You need to know not only the order of its application, but also how much, and where to lay it.

Do-it-yourself angle grinder grease for gearbox

Although the listed lubricants of domestic production are affordable, they are not always at hand.

Is it possible to make a lubricant for the gearbox of an angle grinder with your own hands??

And there is an affirmative answer to this question.

Since the main technical characteristics of lubricants for gearboxes of an angle grinder are presented above, they can be taken as the basis for compiling the lubricant of the desired characteristics with your own hands.

Homemade gear lubricant should be based on a highly adhesive grease. It must hold firmly to the touching parts.

Grease for CV joints has increased adhesion. SHRUS is a hinge in a front-wheel drive car operating in conditions of increased pollution, shock loads, temperature fluctuations and humidity.

Taking the lubricant for CV joints as a basis, it is necessary to add liquid lubricant (MS-20) to give the mass the desired consistency. Oil MC-20 should be served drop by drop, thoroughly kneading the mass using a homemade mixer.

Good results are obtained by a mixture of a mixture of Tsiatim-221 and TAD-17 lubricants, where Tsiatim is the basis.

When to change the lubricant in an angle grinder

Lubrication on the angle grinder is changed according to the tool maintenance plan, when replacing failed gearbox parts or rotor bearings.

Old grease is dirty and dark in color. This is due to the ingress of foreign particles of metal or dust into it.

Repair angle grinder

: Repairing Sparky 125 Angle Grinder / Repair SPARKY 850 / Angle Grinder Jammed \ maintenance of the power tool

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How can you lubricate the gearbox angle grinder?

Home Tools for working in the country.

The angle grinder is a popular tool used for cutting various materials. Due to its versatility, the intensity of use of the angle grinder by the average owner is quite high, which necessitates competent maintenance.

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Lubricant selection

So, how to lubricate the blank reducer?

What Kind Of Lubricant Is Better To Use For The Gearbox Angle Grinder

First of all, specialized formulations are recommended. Usually, such a grease has a blue color and a rather long marking, which reflects the mass of various parts: type of additives, viscosity grade, compliance with certain standards (usually ISO or DIN).

This type of lubricant is specially designed for the conditions of an angle grinder, therefore it is optimally suited to its task. When choosing which lubricant to use for the gearbox of an angle grinder, pay attention to the following parameters:

  1. Maximum and minimum working temperature. The latter circumstance is especially important in the conditions of our country.
  2. The presence of extreme pressure additives.
  3. Slide type (in most cases, we are interested in bearing).
  4. Consistency (must correspond to that recommended in the instructions for the equipment).

Please note that universal greases such as grease or lithol are not designed for operating conditions typical for grinders. In urgent circumstances, they can be used, but it is recommended to change to specialized formulations at the earliest opportunity.

In addition, it is better to entrust the filling of the gearbox with lubricant to the specialists of specialized service centers.

Correct grease filling process in angle grinders

Packing grease into the units of an angle grinder has its own rules. You need to know not only the order of its application, but also how much and where to lay it.

Overview of lubricants for angle grinders

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 Lubricant for gearboxes and is packaged in tubes of 65 grams. One such tube is enough for several servicing angle grinder.

Grease for gearbox angle grinder of various brands

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

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. Excess will cause it to be squeezed out from under the cover, and an insufficient amount will not ensure correct operation of the gearbox.

Therefore, 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 3050% of the full capacity of the gearbox.

Gearbox lubricated

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.

Removing old grease from the gearbox

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.

When to change the lubricant in an angle grinder

The frequency of changing the lubricant depends on how often and under what load the tool is used. As a rule, 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.

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.

Checking the correct lubrication of the gearbox angle grinder

The final step in servicing your angle grinder is to check that the lubricant is correctly applied and distributed inside the gearbox. To do this, after the gear unit is assembled, the power tool is turned on without load for a few minutes, while ensuring that there are no extraneous sounds, odors and other things. If they occur, you must immediately disconnect the angle grinder from the mains. The heating of the gear unit is also checked. The lubricant must distribute heat evenly and the temperature of the gear unit must not be too high.

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After a short work, unscrew 4 screws, then remove the cover from the gearbox. Visually inspect the helical gears for lubrication. If it is absent, then too little lubricant has been loaded and should be reported. If in the process of work it is squeezed out of the cracks, then it has been laid too much and the excess should be removed. After making any changes, check the operation of the angle grinder again without load.

The procedure for applying grease to the gearbox angle grinder

Before applying new grease, 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 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.

Bearing grease phase

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 daily operation, an angle grinder with frequent overheating, the frequency of change 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 housing, 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, add lubricant.

What, how and when to lubricate the angle grinder

Lubricant for the gearbox angle grinder: service life, main stages of replacement. Application technology, recommended amount. Selection criteria and options, self-made lubricant.

In angle grinders (angle grinder), commonly called angle grinders, the main load falls on the gear reducer changing the rotation axis. Care for it is required throughout the entire period of operation, since the mechanism needs to reduce friction between its interacting parts, timely maintenance. The use of lubricant for the gearbox of the angle grinder allows not only to minimize the destructive frictional effect, but also helps to cool the tool.

Old grease removal stage

Removing used grease is the first step in gearbox maintenance. It is necessary to remove the old layer for several reasons:

  • The spent lubricant is not able to perform its functions;
  • It contains small particles formed during the wear of the rubbing elements;
  • Old grease will mix with new grease, because of this, the unit will not work properly, replacement will not bring any results.

Removal of waste is carried out using disposable paper towels, rags or a piece of tissue at hand. The removed parts of the gearbox should be thoroughly washed in thinner or gasoline, and dried before installation. Residues from cleaning materials can also mix with the new grease and change its consistency, resulting in poor performance.

How to properly lubricate an angle grinder. Which lubricant to choose

  • The use of expensive special gear lubricants from well-known brands;
  • The use of universal compounds suitable for any power tool;
  • Lubrication of the gearbox with lithol or grease;
  • Use of self-made lubricant.

Application of special materials is the best solution. When choosing a lubricant for a gearbox, it is recommended to give preference to formulations produced under the same brand as the angle grinder itself. For example, if the machine is of the AEG brand, then the lubricant must be bought of the same brand.

When using specialized products, the service life of the angle grinder is significantly increased, since the manufacturer takes into account all the features and nuances of operating its own equipment. The disadvantage of using branded materials is their high cost, which can affect the family budget.

The most unfavorable solution is the use of lithol or solid oil, since both of these materials are not designed for lubrication of friction units heated to high temperatures. Some owners of grinders use only these formulations, which is why their machines cannot last for the lifetime declared by the manufacturer. In an effort to benefit from the here and now, they do not factor in future spending on a new tool or replacement of expensive parts.