The grinder, like other tools used in household and professional activities, requires regular maintenance. Operating efficiency and long service life are ensured by timely maintenance.
Grease for an angle grinder is the main component when servicing the device. To improve performance, you should choose the right composition.
Substitution rules
Main modular block An angle grinder is a gearbox. It takes on the bulk of the load during operation. It contains helical gears that transmit torque from the rotor to the operating element. Lubricating the grinder gear reduces the friction force in the gears. It also helps reduce the temperature that occurs during operation.
In what cases should the lubricant be replaced? During operation, the lubricant coating scatters along the sides of the gearbox housing. After a short time it begins to dry out and lumps form. Lumps can accumulate dust and metal particles generated during operation. If, when disassembling the grinder, lumps are found, then new lubricant is needed for the grinder gearbox.
There are situations when it is necessary to replace parts of an angle grinder gearbox or a rotor bearing. In this case, it is necessary to disassemble the device. Accordingly, the lubricating layer will be removed. Instead, new material is applied.
During long periods of operation, the grinder's gearbox heats up. Accordingly, the coating used also begins to heat up. When heated, the lubricant becomes liquid and may leak out. As a result, little of it remains inside. This can be seen if you examine the gears. There should be a thick layer on them. Thus, with a small amount of lubricant coating, it is necessary to replace it.
Lubricant properties
The lubricating coating for gearboxes is characterized by the following properties:
- viscosity no more than 800 Pa*s;
- drop falling temperature is not less than 120°C;
- tensile strength not less than 120 Pa;
- absence of mechanical impurities;
- corrosion resistance;
- high melting point;
- water repellency.
It is necessary to choose a lubricant that does not contribute to the occurrence of nicks in areas of contacting parts.
When choosing a coating, you should be guided by the condition that the lubricant coating for the bearing parts of the gearbox differs from the lubricating coating of the engine bearings.
Types of lubricants
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 using a suitable lubricant during maintenance to avoid negative consequences during operation. When using a composition from another manufacturer, the tool is not subject to warranty repair.
Many people will think that lubricating the gearbox with the manufacturer’s compound is very expensive. After all, the cost of such materials is quite high. In addition, there are manufacturers that do not produce lubricants.
In this case, you can purchase CV joint lubricant, which is available in a wide range on the shelves of auto stores. This material allows you to achieve positive results during operation. And many people use this lubrication option. However, it is worth noting that this option is worse than the first.
When choosing solid oil or lithol as a lubricant, there is a risk of causing the instrument to quickly break down. This is due to the fact that these substances do not require use at elevated temperatures and high friction. Therefore, after some time, problems may arise during the operation of the tool.
Thus, the best option lubricant for angle grinders is considered to be the one that corresponds to the brand of the tool manufacturer.
Stages of the lubrication process
Lubrication can be done in special workshops or independently. When performing lubrication on our own You must remember that a lubricant that does not match the brand of the tool can cause tool failure. The process of processing with new lubricants implies the complete removal of the old lubricant layer. The parts and walls of the housing must not contain remnants of the old coating.
Stages of lubrication of an angle machine gearbox:
- disassemble the grinder;
- wash the sides and cavities of the gearbox with kerosene or a solution of kerosene and gasoline;
- dry the washed parts;
- mix new lubricant;
- coat bearings and cavities;
- assemble the tool.
When applying, the question arises: how much lubrication is required? Application large quantity lubricant will cause excess volume to leak out during operation. If the content is low, the operation of the gearbox will be difficult and will lead to rapid failure. Consequently, such a volume of material is placed in the housing that the gear teeth are hidden under the surface of the applied layer. The approximate content of the coating of angle grinder gearboxes is less than ½ the volume of the entire gearbox.
Checking the accuracy of application
The grinder's lubrication, namely its abundance, is checked in idle mode during a test run for a short period of time. After starting, the gearbox begins to heat up. If some of the lubricant leaks out when the gearbox is warm, then it is necessary to disassemble the tool again and remove the excess.
If, as a result of a short period of work at Idling signs of noise or rattling appear, the volume of the applied layer must be increased.
Getting high-quality lubricant with your own hands
If you want to use good composition lubrication of the angle grinder gearbox, but there is no possibility of purchasing it, then you should make it yourself using CV joint lubricant. Do not forget that the material used must have good adhesion.
The composition must adhere firmly to the rubbing elements. The composition for CV joints is characterized by increased adhesion and the ability to work at high temperature loads.
To prepare the mixture, a composition for the CV joint and MS-20 oil are taken to enhance the required viscosity and density. Using homemade mixer, the composition is mixed with a small supply of oil (drop by drop).
You can also obtain material from a mixture of lubricants Tsiatim-221 and TAD-17. The main component is Tsiatim.
Popular brands of lubricants
Foreign-made gearbox lubricants are much more expensive than domestic ones. The Bosch brand is widely known among foreign brands. It is used to lubricate tools of the same brand, as well as other models of grinders. The coating has good performance properties.
According to many users, the Huskey brand is considered a universal lubricant. It is perfect for many gearboxes.
Among domestic manufacturers, the products of the company “Nanotech” are known under the name “Metal Plak Electra”. Lubricants of this brand are used for many components of electric tools.
Operating an angle grinder without a lubricant coating will first lead to minor operational problems and then to failure of the tool. Lubricated gearboxes will extend the life of the tool and increase productivity. The master himself decides which lubricant is suitable for the existing device.
Angle grinders (angle grinders) have become widespread among people who love to make crafts and perform various repairs and construction works at home. Such tools allow not only grinding various surfaces, but also cut stone, metal, plastic and other materials. Angles are reliable tools that require proper maintenance during operation, in particular, timely replacement of lubricant. Let's talk about choosing a lubricant for the gearbox and bearings of angle grinders.
Characteristics and features of lubricants for angle grinders
In an angle grinder, the main unit, which is subject to the greatest loads during operation of the tool, is the gearbox, which is a structure of helical gears. During operation of the angle grinder, the rotor creates a torque that is transmitted to the working tool through the small gear to the large gear. High-quality lubricant for the grinder gearbox significantly reduces the heating temperature, the friction force inside the tool and reduces the wear of its parts.
Bearings also require periodic lubrication. grinder, especially the spindle support bearing of the large gear. To do this, it is necessary to use only high-quality, reliable compounds recommended by manufacturers of grinders. Experts recommend using oils with the following technical characteristics:
- viscosity up to 800 Pa·s;
- tensile strength more than 120 Pa;
- drop point more than +120°C;
- absence of mechanical impurities;
- resistance to corrosion processes;
- the ability to firmly hold onto the parts of the angle grinder;
- resistance to high temperatures;
- water-repellent properties.
When choosing lubricants, it should be taken into account that in a modern angle grinder two types of bearings are used - for the electric motor and for the gearbox. For them it is necessary to use different compositions, since the bearings differ from each other different conditions work.
Materials from foreign and domestic manufacturers
For foreign brands of angle grinders, it is recommended to use specialized compounds developed specifically for such power tools. Most often, manufacturers of angle grinders recommend using lubricants that have this marking - MoS2 NLGI 2 ISOL-XBCHB 2 DIN 51825-KPF 2 K-20. The following information can be obtained from this marking:
- MoS is an indication of the filler material used (number 2 is molybdenum);
- NLGI2 – viscosity class, here it is the second;
- ISOL-XBCHB 2 – confirms the compliance of materials with the ISO standard;
- DIN, KPF, K-20 – confirms compliance with the German DIN quality standard;
- the numbers 51825 mean that the material is classified as type "K".
This marking confirms the highest quality of the material, but such lubricants are very expensive. You can buy high-quality oil much cheaper; each manufacturer of angle grinders creates its own special lubricant, the use of which will extend the life of the angle grinder and guarantee excellent operation of the tool. On the market you can find compositions from the companies Makita, Bosch, Hitachi, RedVerg, Metabo, Interskol and many others.
Manufacturers insist that their own lubricants must be used when servicing tools. The use of a composition of a different brand may result in denial of warranty service.
Considering the high cost of lubricants for power tools from foreign manufacturers, in some cases it is easier to use domestic analogues. IN last years Russian manufacturers are actively creating universal formulations of the highest quality, not inferior to Western standards and suitable for the most different instruments. In addition to gearboxes and bearings for angle grinders, they can be used for drills and rotary hammers.
Among all domestic lubricants on the market, the company's products are the most popular among consumers, due to the best price-quality ratio Nanotech MetalPlak Electra. This company produces whole line quality materials, which can be selected for lubricating components of any tools.
Oil for grinder bearings
There are three bearings in the angle grinder - two of them are in the rotor, and one is on the large helical gear shaft. Lubricated bearings are installed in the tool, but during operation, if the power tool overheats and is used incorrectly, the oil may simply leak out. To refill bearings, formulations that meet several important requirements are required. The lubricant should:
- increase sliding and reduce friction between the components of parts.
- distribute heat evenly and cool parts from overheating.
- Protect the parts of the angle grinder from dust and dirt.
- prevent corrosion processes.
- withstand high temperatures - up to 150°C.
At the same time, the gearbox and engine bearings operate in different temperature conditions and at different loads. Therefore, for an electric motor it is necessary to use compositions that have good protective qualities, preventing contamination of parts and the ingress of moisture onto them. The market offers a wide range of domestic and foreign bearing oils, and Russian products are more popular, as they are not inferior to their analogues in quality, but are much more affordable. To lubricate bearings, it is best to use brands VNIINP-235, VNIINP-246 And Ciatim-221.
Unlike gear oil, which must adhere firmly to the teeth as it rotates, bearing lubricants do not require as much adhesion.
Is it possible to make gearbox lubricant yourself?
There are often cases when you urgently need to lubricate the parts of an angle grinder, but suitable material not at hand. In this case, there is an urgent need to obtain suitable oil, which can be made by the owner of the instrument with his own hands. When manufacturing such materials, it is necessary to take into account all the requirements described above.
To ensure high adhesion of oil for angle grinders, it is necessary to use automotive lubricant for CV joints as a basis for its production. In addition to good adhesion, it is also distinguished by its ability to work in conditions of heavy pollution and high loads, and can withstand high humidity and strong temperature changes.
The lubricant can be made on the basis of automotive lubricant for CV joints
It is necessary to add MS-20 liquid oil to this base so that the resulting mass has a suitable consistency. MS-20 should be gradually added to the base, preferably drop by drop, and the composition should be thoroughly mixed with a mixer. Excellent results are shown by a homemade mixture made from Tsiatim-221 taken as a basis with the addition of TAD-17. They make a very high-quality and functional homemade gear lubricant.
For good work, the grinder needs lubricant that will not leak under heavy loads and long work, but will reliably lubricate the part over its entire surface during the entire operating time. It must also be environmentally friendly. Pay attention to well-known and already proven lubricant manufacturers, such as Lubcon, Hammer, Makita, Hitachi. Experts advise, if possible, to choose a lubricant from the same company as your tool.
Deciding how to lubricate the grinder, Special attention Pay 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 and under all loads. They are highly resistant to oxidation, protect against corrosion, and are easily combined with plastics and elastomers. The composition contains exclusively silicone and lithium thickener, which makes them safe from an environmental point of view. The consistency is maintained at temperatures from -50 to +190 degrees Celsius.
Lubricant for the grinder and its precise markings
One of the most important elements of an angle grinder is the gearbox. When the tool is working, it becomes very hot, 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 one casing is not enough to cope with high temperature, proper lubrication also plays a huge role.
Every specialist, when asked how to lubricate the gearbox of an angle grinder, will answer that it is best to use a special lubricant for angle grinders. It is specifically designed for the work and conditions in which this tool is used. This lubricant has a specific Blue colour. A good, high-quality lubricant for an angle grinder gearbox has the following marking: 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 class;
- ISOL-XBCHB 2 – compliance with ISO standards;
- DIN 51825-KPF 2 K-20 is the most important point, it means that the lubricant 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 lubricant with similar qualities: KPF 2 K-20, where:
- K – intended for plain bearings;
- R – with extreme pressure additives;
- F - with solid filler;
- 2 – consistency corresponds to NLGI;
- TO - Maximum temperature work +120 degrees Celsius;
- 20 – minimum temperature work.
Note! The use of special lubricants for angle grinders will provide the maximum guarantee of reliable operation.
About tools under warranty
Particular attention should be paid to lubrication of angle grinders that are under warranty. It is not recommended to do this yourself; this work should be entrusted 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 longevity of the tool.
Various lithols and solid oils for lubricating gears and bearings are strictly prohibited. In addition, opening the case on warranty instruments will be a reason for refusal of 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 processed regularly.
It’s no secret that in the construction industry, grinders (or angle grinders – angle grinders) can easily be considered one of the most popular tools. You need to cut various materials(tiles, stone, sheets of metal), and perhaps grind the cuts? In this case an indispensable assistant an angle grinder will be at work.
The correct choice of lubricant for an angle grinder gearbox is the key to excellent tool performance.
The gearbox is one of the most important elements of an angle grinder. It converts the higher angular velocity occurring on the input shaft into output shaft speed, thereby increasing the torque. The coefficient largely depends on the successful operation of the gearbox useful action power tool, which generally determines the performance of its work. It is known that in order to increase the efficiency of a tool, it is necessary to reduce the friction between its individual parts and ensure heat removal (the angle grinder gets very hot during operation). The functions of reducing friction and removing excess heat are performed by the lubricating fluid, which is why the question regarding which lubricant to lubricate the angle grinder gearbox is of interest to both professionals and home craftsmen.
Note that any Lubrication only reduces friction and does not eliminate it completely, therefore, when the mechanism operates, the smallest particles of parts still end up in the oil. Over time, metal dust accumulates in the lubricant, which as a result loses its viscosity and can no longer perform its function as effectively. Thus, the viscosity of a lubricant is the main indicator that should be paid attention to when purchasing it. No less important point– frequency and timeliness of lubricant replacement.
Most manufacturers grinding machines in the technical documentation, in addition to all the parameters of the device, the type of lubricant recommended for use is indicated. Grinders from well-known manufacturers, as a rule, require branded lubricants. Otherwise, if the instrument breaks down, its owner cannot count on free warranty repairs. When the warranty period expires, experts recommend continuing to use branded lubricants, but many in this case switch to Russian analogues, which are cheaper.
In general, the requirements for lubrication of power tools are very strict:
- it must ensure the normal functioning of the tool even under very high loads and temperature changes;
- during the entire period of operation it must maintain a good lubricating effect;
- it must fully meet environmental safety requirements.
So, how to lubricate the gearbox on an angle grinder?
Experts advise using formulations that have the consistency of liquid oil. They are poured into angle grinders in a strictly defined quantity. During operation, the lubricant is evenly distributed among the parts and components. The most famous manufacturers of gear oils include companies Bosch, Lubcon, Hammer, Makita and Hitachi.
Plastic compounds are also used to lubricate gearboxes, but do not forget that not all models of angle grinders are able to function stably with products having a similar consistency.
Experts do not recommend using lithol and solid oil to lubricate the gearbox, although they are not capable of seriously harming the tool. Those who still use these funds need to remember that the deadline “ efficient work“Litol has much less than branded lubricants, so it should be changed more often.
When deciding on choosing the optimal lubricant for an angle grinder, pay close attention to products based on silicone or silicone oil. They are suitable for angle grinders operating under various loads over a fairly wide speed range. What distinguishes them is high level resistance to oxidation and corrosion, and they are also quite easily combined with elastomers and plastics. Due to the presence of only lithium thickener and silicone in the composition, such lubricants are environmentally friendly.
Many people ask the question: what original lubricant is used to lubricate Makita angle grinder gearboxes? Of course, most experts agree that the best option is the choice of “native” lubricant (for example, Makita 181490-7). However, if someone thinks that the necessary lubricant for a Makita angle grinder is exclusively the product of this famous corporation from the Land of the Rising Sun, he is not entirely right, since high-quality oils from other well-known companies may also be suitable, but only if they have similar characteristics.
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