Angle grinders (angle grinders), popularly called grinders, are widely used among tinkerers. With their help House master can not only perform grinding work, but also cut metal, plastic, stone. Angle grinders are produced by various manufacturers, including domestic ones.
Angle Sander is a reliable tool that can work when correct operation and timely replacement of lubricant and carbon brushes over a long period of time.
Correctly selected lubricant for an angle grinder not only extends the service life of the tool, but also improves performance characteristics.
Knowing the rules for choosing a lubricant for an angle grinder or preparing it yourself, you can perform maintenance without contacting service departments.
Main characteristics of lubricant for angle grinders
In angle grinders, the main unit that is subject to the greatest loads during operation is the gearbox, consisting of helical gears.
The torque created by the rotor of the angle grinder is transmitted from the rotor to the working tool through the small helical gear to the large helical gear. Properly selected gear lubricant significantly reduces friction and heating temperature.
The grinder uses bearings, which also require periodic lubrication. This is especially true for the spindle support bearing of the large helical gear.
A lubricant that not only meets the listed requirements, but is also environmentally friendly, is suitable.
Lubricants for angle grinders must have certain characteristics and must be of the required consistency in terms of properties.
Lubricant for an angle grinder gearbox must have:
- viscosity not more than 800 Pa·s;
- dropping temperature not less than +120ºС;
- tensile strength of at least 120 Pa.
Lubricant for angle grinders should not have mechanical impurities, be resistant to corrosion, firmly adhere to lubricated parts, not melt at high temperatures, prevent the formation of scuffing at the points of contact between parts and, of course, have water-repellent properties.
An angle grinder from any company uses two types of plain bearings: bearings for the electric motor and support bearings for the gearbox.
The selection of lubricant for electric motor bearings differs from the selection of lubricant for a gearbox bearing. It's all about different conditions work.
Foreign tool manufacturers, including angle grinders, recommend lubricants specially developed ointments for Bulgarians.
One of the most common foreign lubricants is the lubricant marked MoS2 NLGI 2 ISOL-XBCHB 2 DIN 51825-KPF 2 K-20.
Let's decipher the marking:
- MoS2 – indicates the filler material, in in this case molybdenum;
- NLGI2 - indicates the second viscosity class;
- ISOL-XBCHB 2 – belonging to ISO standards;
- DIN 51825-KPF 2 K-20 – lubricant manufactured according to German DIN standards;
- The numbers 51825 mean that the lubricant is type K.
Lubricants produced with such characteristics are quite expensive. On Russian market imported, less expensive lubricants are present.
Every 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 when performing Maintenance the lubricants specified in the instructions were used. Moreover, failure to comply with these recommendations does not allow warranty repairs to be performed.
Lubricant for the Makita angle grinder gearbox is available in tubes. Her high price commensurate with high quality and long term work.
Lubricants from domestic manufacturers for bearings and gearboxes of angle grinders
With rising prices for foreign lubricants, lubricants from domestic manufacturers have become especially in demand.
Russian lubricant manufacturers have learned to produce high-quality lubricants suitable for any tool.
Lubricants have been developed for gearboxes of grinders, hammer drills, and drills.
Nanotech Metal Plak Electra products are especially popular. The range of lubricants produced by this company allows you to select the right lubricant for each unit.
Lubricant for angle grinder bearings
Three bearings are installed in the design of the angle grinder. Two bearings are mounted on the tool rotor, one bearing is mounted on the shaft of the driven helical gear of a larger diameter.
Angle grinders use bearings already filled with lubricant. But due to improper use or overheating of the tool, the lubricant leaks out.
How to choose the right lubricant for grinder bearings?
Bearing lubricant must meet the following requirements: 
- increase sliding;
- reduce friction between components details;
- distribute heat evenly and act as a coolant;
- prevent corrosion;
- protect from dirt and dust getting inside;
- work in the required temperature range up to +150C;
The operating conditions of electric motor bearings differ from the operating conditions of gearbox bearings not only due to temperature requirements, but also due to operating modes, load conditions, frequency and rotation speed.
Lubricant for electric motor bearings must have protective properties preventing dirt, dust and moisture from entering the bearing parts.
The Russian market offers a wide range of foreign lubricants intended for bearings operating in different conditions. But their cost forces us to look for cheaper, domestic lubricants that are not inferior in quality.
Possessing high water-repellent properties, they have a wide temperature range. The role of a thickener in them is performed by organic and inorganic substances. For sealed bearings, it is best to use lubricants CIATIM-203, VNIINP-242.
From pigment lubricants For electric motor bearings, blue grease VNIIMP-246 and dark purple ointment VNIINP-235 have become widespread. The first lubricant is less common than the second due to its high price.
On today's Russian market they are presented in a wide range of products.
Lubricant for angle grinder gearbox
The grease for the grinder gearbox is different from the grease for the bearings. main feature- increased adhesion. It should hold firmly on the gear teeth when it rotates at high speeds.
In general, the process of lubrication of the gearbox in angle grinders occurs due to fine splashing of the lubricant and its suspensions. The gearbox operates as if in an oil mist. Therefore, the lubrication requirements for gearboxes are somewhat different.
In addition to increased adhesion, gear lubricant must have high heat resistance and not melt at elevated temperatures.
Do-it-yourself grease for the grinder gearbox
Listed lubricants domestic production although 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 specifications lubricants for angle grinder gearboxes are presented above, they can be taken as the basis for preparing a lubricant required characteristics with your own hands.
The basis of a homemade lubricant for gearboxes should be a lubricant with high adhesion. It must hold tightly to the contacting parts.
Grease for CV joints has increased adhesion. A CV joint is a joint in a front-wheel drive car that operates under conditions of increased dirt, 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. MS-20 oil should be added drop by drop, thoroughly kneading the mixture using a homemade mixer.
Good results are obtained from a mixture of Ciatim-221 and TAD-17 lubricants, where the base is Ciatim.
The correct process for packing lubricant into angle grinders
Packing lubricant into the components of an angle grinder has its own rules. You need to know not only the order in which it is applied, but also how much and where to place it.
When to change the grease in an angle grinder
The lubrication on the angle grinder changes according to the tool maintenance plan, when replacing failed gearbox parts or rotor bearings.
Old grease is dirty dark color. This occurs due to the ingress of foreign metal particles or dust into it.
How to properly remove old grease from an angle grinder
Old grease is always completely removed, regardless of its color. There should be no traces of old grease on the parts, and there should be no particles of destroyed parts in the cavities of the body.
To remove old grease, you can use various washing liquids used by motorists to wash the engine and its parts. At home, it is recommended to use kerosene or a solution of kerosene and gasoline.
All parts and their cavities must be thoroughly washed and dried.
The procedure for applying lubricant to the grinder gearbox
Before application, the new lubricant is thoroughly mixed and applied. thin layer. Lubricant is applied to the bearings by packing. If the lubricant is in a plastic tube, then the neck of the tube is placed against the side cage of the bearing and squeezed out until it flows out. reverse side.
How much lubricant should be used when replacing an angle grinder gearbox?
If the amount of lubricant in the bearings is controlled by flowing out from the reverse side, then a certain amount of lubricant is filled into the angle grinder gearbox. Excess lubricant will leak out during operation. And a small amount of it will not provide quality work gearbox
It is necessary to leave as much lubricant in the gearbox as is required to cover the gear teeth.
As a guide, apply enough lubricant so that it occupies slightly less than half the volume of the gearbox cavity.
Checking the correct application of lubricant to the angle grinder gearbox
Monitoring the volume of lubricant filled into the gearbox is carried out by test turning on the assembled angle grinder for a short time in idle mode.
If the gearbox begins to heat up and traces of lubricant leakage appear from the seals and gaskets, then the conclusion is clear. You have transferred the lubricant. Open the gear housing and remove excess lubricant. All excess lubricant will be placed on the gear housing covers. An insufficient amount of lubricant in the gearbox is determined by increased operating noise of the gearbox.
At long work Angle grinder lubricant in the gearbox is distributed on the walls of the housing and loses its properties due to external influences.
After opening the gearbox cover, carefully inspect the condition of the lubricant and the tooth profile of the gears. If you can, check the contact patch of the gears.
The presence of particles of dry or dried lubricant in the gearbox area or on the housing indicates that the time has come to change the lubricant.
Video of grinder repair
Video: Repairing the Sparky 125 angle grinder / Repairing the SPARKY 850 / Grinder jammed \ maintenance of the power tool
Angle grinder working in extreme conditions and under heavy load. Due to this, periodic lubrication of the grinder gearbox is necessary, since they extend to the moving parts of the power tool. high requirements to lubrication. Otherwise, if there is a shortage of lubricant, increased wear occurs and the service life of the power tool is reduced.
The angle grinder gearbox is designed in such a way that the grease lubrication of a pair of gears moves to the housing walls under the influence of centrifugal force. A sign of “draining” of the gearbox is increased noise during operation of the grinder. When opening the gearbox housing, the problem becomes obvious. All the factory grease is on the walls of the housing, the helical gears are almost dry.
We check the degree of wear of a pair of gears and damage to the teeth. If necessary, replace the gears.
We clean the surface of the gears from mechanical dust. Lubricate the sealed bearings of the engine rotor and the working shaft of the gearbox with liquid motor oil. We rotate the rotor intensively to ensure uniform penetration of the lubricant into the bearing. Remove excess liquid lubricant with a clean rag. If this is not done, it will mix with the gear grease and make it thinner. Liquid lubricant will not adhere well to the gear teeth.
If the factory grease for the grinder in the gearbox is of normal quality, apply it to the teeth of both gears as thickly as possible. If there are signs of aging of the lubricant, wash the gearbox with kerosene or other penetrating liquid and replace the lubricant.
Regarding the question of how to lubricate the gearbox of an angle grinder, any high-temperature grease is suitable, for example, for lubricating CV joints and wheel bearings of a car. Do not forget to apply it to the shaft support bearing.
We assemble the gearbox, carefully tightening the fasteners. If you leave play in the gear pair, the gearbox may jam.
Also, when servicing an angle grinder, it is necessary to lubricate the second rotor bearing and check the condition of the motor brushes.
Depending on the intensity of use, a similar procedure (lubricating the grinder gearbox and checking the condition of moving parts) must be performed regularly. This will extend the life of your power tool.
Simply called the Bulgarian. Using this tool, craftsmen perform many operations. It, like any other equipment, requires full maintenance. Moving elements need lubrication. For this purpose special means are used.
There are several options. Advice from experienced professionals will help you choose the best method. The grinder will work for a long time and efficiently.
The role of lubrication
Manufacturers of the presented power tools, when manufacturing the tool mechanism, provide moving, rubbing parts with special lubricant. The composition of such products may vary. Therefore, wondering How to lubricate the gearbox of an angle grinder (Devolt) this or another brand), you need to look at the instructions. The manufacturer can clearly define the composition options that are allowed to be used when servicing equipment.
Under heavy loads under which equipment must operate, as well as at high heating temperatures, lubricants prevent premature wear of metal parts.
Special components allow excess heat to be removed from rubbing pairs. Also, many manufacturers provide such an important function of their products as anti-corrosion. The complexity of the action allows us to ensure full-time job tool, extend its operation for many years.
Specifications
To have an idea, how to lubricate the gearbox of an angle grinder (“Interskol” or products other manufacturers), it is necessary to consider the features of this tool. They affect the technical characteristics that the lubricant should have.
The main and most loaded unit of the grinder is the gearbox. It consists of gears of a certain configuration. Proper lubrication can reduce friction and heat the moving parts. To do this, the consumable material must have a viscosity of no more than 800 Pa*s. Its dropping point must be at least 120ºС. The tensile strength is recommended at 120 Pa. This allows the product to form a durable film on the surfaces of the parts.
The lubricant must consist of naturally soluble components. It shouldn't cause harm environment and human health. Verified funds famous manufacturers have the appropriate quality certificates, so they are recommended to be used for servicing the tool.
Signs of lubricant aging
Interested in how to properly lubricate the gearbox in an angle grinder, it is necessary to consider signs of lubricant aging. If the technician disconnects the gearbox from the angle grinder and looks inside, he may see clear signs of the need to change the composition.
When the unit operates, the lubricant sprays and settles in a dense layer on the inner walls of the housing. Over time, the substance dries out. In this case, lumps are formed. This indicates the need to change the lubricant.
As the temperature rises, the lubricant becomes more fluid. It may spread as it leaves the gearbox mechanism. To prevent friction, its amount must be controlled. If there is no thick layer of lubricant on the gears, then it is time to change it. Otherwise, the tool will quickly fail.
Foreign lubricants
To decide How can you lubricate the gearbox of an angle grinder?, it is necessary to consider a number of expert recommendations. They argue that you should choose the oil that is produced by the equipment manufacturer. Such compositions are not cheap. However, they have a balanced set of additives that provide long-lasting angle grinder work. If the equipment user purchases other lubricants to service the power tool, the equipment may not even be covered by the warranty.
However, if desired, you can replace the compositions recommended by the manufacturer with similar products. For foreign models of angle grinders, products that contain additives identical to those used by the manufacturer of the angle grinder are quite suitable.
If molybdenum was present in the lubricant, it is necessary to purchase a composition marked MoS2. For Bulgarians who are served consumables second viscosity class, suitable composition NLGI2. Lubricants marked ISOL-XBCHB 2 comply with the ISO standard. If the product was manufactured according to German DIN quality standards, the new oil must contain the indication DIN 51825-KPF 2 K-20 in the marking.
Domestic lubricants
Considering how to lubricate the gearbox of an angle grinder domestic production, it is necessary to pay attention to locally produced compositions. Today Russian companies offer wide choose similar means. They have an affordable price.
Modern domestic materials for lubrication of angle grinder gearboxes are characterized by: high quality. They meet high foreign standards. They are used not only in grinders, but also in other types of power tools.
The products of the Nanotech Metal Plaque Electra company are especially popular. However, there are other types of maintenance compounds for any angle grinder unit, including the gearbox.
Experienced specialists provide recommendations, What is the best way to lubricate the grinder gearbox?. They claim that if it is impossible to service the tool with a proprietary lubricant, you can choose a different composition. The second most popular lubricant in our country is recognized as CV joint lubricant. It is most often used for domestically produced tools. Some craftsmen choose lubricant for CV joints and for foreign angle grinders. However, the quality of the original compositions will be much higher.
It’s worse if the master gave preference to compositions such as litol or grease. This universal means. They are not capable of efficiently servicing the grinder’s gearbox system. If they are used, the operation of the tool will not be complete. At the beginning of operation, the difference will not be noticeable. But over time, serious problems may appear in the operation of the unit.
Preparing to change the lubricant
Having explored the options, how to anoint the grinder gearbox, it is necessary to delve into the process of applying a new composition to the elements of the mechanism. This procedure is carried out according to the power tool maintenance plan established by the manufacturer. This must also be done when replacing gearbox parts or rotor bearings.
The waste will have a dirty color. This is due to the ingress of metal particles and dust into it. Before lubricating the gearbox, it is necessary to remove old oil from the surfaces of the mechanisms. The waste is removed completely.
To perform this procedure, automotive engine cleaning products are suitable. You can also use kerosene or gasoline. Using these products, traces of old lubricant are completely removed from the surfaces of all parts. After treatment, the gearbox must be thoroughly dried. Only after this you can start refueling.
Gearbox maintenance
Having selected and prepared the mechanism for this process, you can begin servicing the tool. The product must be mixed thoroughly. It is applied in a thin layer to the gearbox parts. The mass is applied to the bearings using the packing method.
If the product is packaged in a tube, its neck is placed on the side of the bearing cage. The composition is poured inside until it flows out from the other side. Enough grease is filled into the gearbox so that it covers the gear teeth. The excess will flow out when the grinder is in use. Lack of lubrication leads to increased heat and friction inside the mechanism.
Experts recommend adding such an amount of substance so that it occupies almost half the space of the gearbox housing. In this case, the operation of the tool will be correct. The manufacturer may indicate in the operating instructions some of the nuances of this process. They should also be taken into account when servicing angle grinders.
Control
Having studied how to lubricate the gearbox of an angle grinder, a procedure should be considered to ensure that the tool is properly maintained. The angle grinder must be assembled and connected to the network. When starting the engine, the quality of filling the gearbox with lubricant is assessed. To do this, the grinder is placed in idle mode for a short time.
If the gearbox begins to heat up after the test, and traces of lubricant appear from the gaskets, it means that there is too much substance in the mechanism. After disconnecting the tool from the network, you need to open the gearbox cover. There will be excess oil on the walls. They are removed from the equipment cavity.
If extraneous noise appears in test mode, insufficient lubricant was applied. In this case, the tool is disassembled and an additional amount of compound is added to the gearbox. Then the verification procedure is repeated. If everything is in order, the tool can be used as usual.
Having considered how to lubricate the gearbox of an angle grinder, as well as the procedure for this process, each master will be able to service his equipment independently without any problems.
Guaranteed long life for anyone hand tools consists of proper periodic maintenance. Of course, you can send it to special service centers for maintenance and diagnostics, but, as they say, “If you want it done well, do it yourself.” Therefore, it’s worth figuring out how to independently service such a popular tool among home craftsmen as an angle grinder or grinder, among the common people.
The moving parts of an angle grinder are the most susceptible to wear. These are armature bearings, gears, as well as the gears themselves located in the gearbox. The lubricant (or lubricant) supplied 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 lubricant in the angle grinder gearbox must be carried out at least once a year.
Characteristics and features of lubricants for angle 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 could cause chipping of the moving parts of the mechanism.
- The temperature at which the lubricant becomes liquid must be more than 120 degrees.
- The oil should not absorb moisture and should form a durable film that protects parts from corrosion.
- And also, most importantly, the oil must be of such viscosity that it is able to adhere to moving parts.
The consistency or viscosity of lubricants is classified according to the NLGI (National Lubricating Grease Institute), and in certain cases it is necessary to use oil of a certain thickness. The viscosity of the oil is selected depending on the speed of the gearbox; the higher it is, the thinner 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. Lubricant with index NLGI-2 which is soft.
- Lightweight hammer drills and impact drills. Class NLGI-1, very soft consistency.
- angle grinder, circular saws, brush cutters. Class NLGI-0, semi-liquid consistency.
- Heavy hammer drills, jackhammers. Class NLGI-00, consistency is liquid.
Lubricant for angle grinder gearbox
Almost all global tool manufacturers require the use of their recommended “own” lubricant, sold under their brand. In principle this is correct. The lubricant used for the angle grinder gearbox, in this case, is tested at the manufacturer; it guarantees long-term and proper operation of the angle grinder. However, there are some disadvantages here, which are: high price lubricants from these brands.
In addition to original oils, there are many lubricants on the market produced by third-party manufacturers, so the question of what exactly to lubricate the gearbox of an angle grinder is not an urgent one.
Products from Haskey, Castrol, Liqui Moly and others have proven themselves to be good for adding to an angle grinder gearbox.
Russian manufacturers also keep up with foreign ones and offer their products. Thus, the lubrication of bevel gear angle grinders from the Nanotech company is very popular. Of course, such gear lubricant is not original and recommended by the manufacturer, so if it is used, subsequent warranty repairs may simply be refused.
The correct process for packing lubricant into angle grinders
After the choice of lubricant for the angle grinder has been made, they proceed directly to servicing the tool. The right process 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, and check the correct application. Removing the old lubricant is necessary for the reason that when mixed with the new one, it will not allow it to work correctly and the entire maintenance procedure will not bring any results.
When to change the grease in an angle grinder
The frequency of replacing the lubricant depends on how often and under what loads the tool is used. As a rule, this period is approximately a year. In 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 the 4 screws on its cover.
After removing the cover, you can see two bevel helical gears: a large gear and a small gear. The small gear is anchored and drives the large gear. The large one, in turn, is mounted on a secondary shaft, to which a cutting or grinding disc is attached.
How to properly remove old grease from an angle grinder
The disassembled grinder gearbox must be thoroughly cleaned of old lubricant. It no longer performs its functions, plus solid particles have already accumulated in it, resulting from wear of moving parts. When mixed with a new one, the old lubricant also significantly worsens its characteristics. Therefore, the gearbox and gears must be thoroughly cleaned.
Remove old grease with a rag, paper towel or just a rag. Removed parts can also be washed in gasoline or solvent. Before assembly, the washed parts must be thoroughly dried. Remaining solvent or gasoline will mix with the new lubricant and change its consistency, which will again worsen its performance.
The procedure for applying lubricant to the grinder gearbox
Before applying new lubricant, it must be thoroughly mixed and ensure that there are no lumps or foreign objects in it. Apply a thin layer of lubricant to the gears, ensuring that it completely covers the teeth. It is more convenient to fill the bearings with grease using a syringe. Then the lubricant intended for angle grinders is driven into the gear housing. This is necessary for the reason that during operation it can fly off the gears and if there is a small amount of it, the gears will run “dry”.
How much lubricant should be used when replacing an angle grinder gearbox?
The volume of lubricant put into the gearbox must be such that the oblique teeth of the gears are completely covered with it. Too much will cause it to be squeezed out from under the lid, and not enough will not ensure correct work gearbox
It is best to rely on the amount that was supplied at the angle grinder manufacturer's factory, but you must remember that the lubricant can dry out and decrease 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 approximately 30–50% of the total capacity of the gearbox.
Checking the correct application of lubricant to the angle grinder gearbox
The last step when servicing an angle grinder is to ensure that the lubricant is properly applied and distributed inside the gearbox. To do this, after the gear unit has been assembled, turn on the power tool without load for several minutes, while ensuring that there are no extraneous sounds, smells, etc. If they occur, you must immediately disconnect the angle grinder from the network. The heating of the gear unit is also checked. The lubricant must distribute heat evenly and the temperature of the gear unit should not be very high.
After some work, unscrew the 4 screws, then remove the cover from the gearbox. The helical gears should be visually inspected for the presence of lubricant. If it is missing, it means that too little lubricant was used and should be reported. If during work it is squeezed out of the cracks, then it means that there is too much of it and the excess should be removed. After making any changes, check the operation of the angle grinder again without load.
Review of lubricants for grinders
It was previously said that there are many types of lubricants ranging from foreign manufacturer, and from domestic. Good lubrication for power tool gearboxes manufactured by Bosh. It’s called “Gearbox Lubricant” and is packaged in 65 gram tubes. One such tube is enough for several grinder maintenance.
Among the lubricants intended for grinder gearboxes produced by a domestic manufacturer, we can recommend the products of the Nanotek company. It is called “Nanotech MetalPlak Electra” and is intended for tools that work under intense load. Also among domestic lubricants, CV joint or Tsiatim-221 are widely used, but they require preliminary preparation and, in fact, are a homemade lubricant.
DIY grease for an angle grinder
A self-made lubricant for grinder gears consists of a base and a diluent. The basis of homemade lubricant is usually a CV joint with molybdenum disulfide or Tsiatim-221. They have a second NLGI viscosity, so for use in an angle grinder gearbox, the base must be diluted. As a diluent, it is best to use simple mineral industrial oil, which, for example, is I-20 oil. To obtain a viscosity of NLGI 0, you will need to mix approximately 70 percent base and 30 percent thinner. The resulting mixture is thoroughly mixed and ready for application to gears and bearings of angle grinders.
Timely maintenance of any electric tool is the key to its long-term and trouble-free operation. A properly functioning tool is also a guarantee of safety for the person using it. Using the tips given above, everyone can choose the right lubricant for the angle grinder gearbox and replace it without resorting to expensive service centers power tool maintenance.
For good operation, the 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 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 essential elements grinders are a 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;
- K – maximum operating temperature +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.