Hammer Hammer Lubricant

How to lubricate a gearbox in a rock drill: lubrication and stages of work How to lubricate a gearbox in a rock drill, the choice of lubricant, the order of work, the features of lubrication of the drill chuck and the requirements for operation.

How to lubricate a gearbox in a hammer drill: lubrication and stages of work

Every tool needs timely maintenance, and the hammer drill needs it first. After all, the work of this tool is accompanied by a huge number of reciprocating rotations and movements, and the volume of dust emitted from the working object has a high concentration. Under these operating conditions, careful maintenance of the device and timely replacement of the lubricant in the perforator gearbox are required.

Most users believe that if grease is present, it can be used indefinitely. This opinion usually exists among users due to the poor level of knowledge of the laws of physics, so let’s talk about the mechanism of the lubrication in more detail.

Why is the hammer drill overheating?

And now we lubricate all parts of the gearbox and assemble it in reverse order. Do not forget that excessive amounts can also affect the performance of the tool: the heating of the gearbox may increase significantly.

If the hammer drill began to heat up more than usual during operation, this does not mean that there is a problem with lubrication. Most likely, you used the chiseling mode for a very long time and the lubrication simply did not pass to all parts of the hammer drill in the right amount.

Another reason may be clogged motor cooling holes. In this case, there is only one solution: to clean the tool from dust and switch it temporarily to another operating mode. If the hammer drill works for half an hour like a regular electric drill, then the body temperature will drop significantly. Reducer must have the same temperature in any mode operation of the puncher.

What is hammer drill lubricant and why is it needed?

Lubricant is a viscous substance designed to minimize the coefficient of friction between tool parts. Reduce, not completely remove. That is, it means that friction between parts is almost always, and some of the small particles are separated from the tool and get into the oil itself. After a while, this grease saturated with metal dust no longer fulfills its direct function. At first, its viscosity simply changes, and later the lubricant itself causes the rapid wear of the tool parts. Viscosity is considered the main parameter that you need to pay attention to when purchasing it.

The manufacturer must indicate in the technical documentation all the characteristics of the tool and the lubricating mass to be used. Much attention should be paid to the frequency of maintenance, which indicates after what time it is necessary to change the lubricant.

For a hammer drill that has a quality certificate, you need be sure to use only original lubricants, otherwise, after failure of the tool, you will lose the right to warranty service. After the warranty period has passed, it is also better to use the lubricant recommended by the manufacturer, but at this time, most often, the user uses cheaper domestic counterparts. Litol or grease will not harm your instrument in any way. But do not forget that lithol is produced much faster, that is, it needs to be replaced much more often.

What is needed to lubricate the rotary hammer gearbox?

This lubricant is also demanding for the temperature regime of operation. But this does not mean at all that it is impossible to use lithol. There are factors when, during the use of domestic lubricating fluid, the impact force of the tool only increases and the noise level generated by it decreases. Over, this is true for a Chinese-built punch.

Users of the Chinese tool do not rely on warranty service, therefore they act at their own discretion from the very beginning of the operation of the hammer drill (or electric drill). As a hammer drill of any manufacturer has its own fundamental design features, then there is simply no single lubrication instruction. The main thing is that you have at hand:

  • Rags;
  • Perforator operating instructions;
  • Branded lubricant or its domestic analogue.

And then, as you already understood, we act clearly according to the instructions. And remember that anyway the perforator must be cleaned as much as possible from dust after work. Make sure that the lubricant level is not more than the reference mark. Most often, the perforator has a special container for the lubricant, that is, it will not be difficult to do this whole procedure.

It is undesirable to lubricate the gearbox in a hammer drill immediately after work, because hot parts, when cold lubricant gets on them, lose their physical characteristics. The drill shank also needs to be lubricated with lithol or grease. If the hammer drill has an open chuck, then it is advisable to process the oil seal. First, you need to disassemble it and wipe it thoroughly. The applied lubricant will make it possible to extend the service life of the device and will protect against dust getting into the tool. There are several types of lubricants:

  • For the gearbox;
  • For drill bits;
  • For drills.
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Can you disassemble the rotary hammer reducer yourself?

The tool reducer requires a lot of attention. It is not so difficult to lubricate the gearbox parts, but before the expiration of the warranty period, it is undesirable to lubricate the rock drill. You will be able to disassemble the gearbox in any case, but not everyone can assemble it. With the problem of gear lubrication it is advisable to contact the corporate service center or specialized workshops. This is a rather delicate job, therefore it is advisable to entrust it to professionals. But there are times when this nearest center is far from you, so you need to lubricate the gearbox yourself.

Pay attention to all details during disassembly. Some of them have absolutely no lubrication. This does not mean that the lubricant has already been used up. It’s just that some of the gearbox parts are not processed. You also don’t need to lubricate them. During disassembly, we try to remember as much as possible the location of the parts and the sequence of their disassembly. Thus, you will not have extra parts when assembling. All gearbox parts need rinse thoroughly with gasoline (or with a spindle) and wipe dry with a cloth. It is also necessary to wash the gearbox housing inside. There is no need to rush to the assembly: let the case dry well.

How to choose a drill lubricant?

One of the most popular products is diesel engine oil. Also graphite lubricant is quite good, it is often used for open worm gears. Litol 24 is also popular, but this grease also causes braking and additional heating. And it works for a relatively short time, unlike branded lubricant for a hammer drill and for cordless tools, it is extremely undesirable.

The principle of the impact mechanism

The principle of operation of the percussion mechanism is based on the vibrations of the eccentric bearing cage, made in the form of an ellipse (see Fig. 1). The inner race of the bearing receives rotation from the motor shaft and drives the elliptical outer race, to which a link is attached through the supports. The rocker converts the rotational uneven movement into the translational movement of the piston, which is removed with its striker along the shank of the percussion tool, transmitting the shock impulse to the working tool, which has a free play in the fastening mechanism.

A special chuck called SDS chuck is used to mount the working body of the punch. There are moving parts in the chuck that work in continuous motion under load, which must be lubricated to extend the service life of the tool, the question immediately arises, why do you need to lubricate the drill bit and what kind of lubricant to lubricate the drill bit?

Hammer Hammer Lubricant

Fig.2 Device of SDS cartridge and a drill shank inserted into it. 1- Striker, 2 Shank of the working tool; 3- SDS cartridge; 4- impact piston.

Punch chuck operation

After the firing pin strikes the end of the shank, inertia forces the bit forward, transferring the impact energy to the end of the working tool. When you press the drill body, the working tool returns to its original position and the striker strikes the end of the drill again. The stronger the pressure, the greater the recoil from the impact of the piston striker, and vice versa, if there is no return of the shank, the working piston will work idle.

So is the punch bit shank lubricated? Undoubtedly needed. If we proceed from the operating conditions, then it is clear that thick and abundant lubrication is needed for the guides of the open grooves, for the closed grooves that work as a bearing, abundant lubrication is not needed, it is even harmful because balls operating under load will not help, but it can collect dust in the grooves.

Fig. 3 Firms, manufacturers of lubricants for shanks of the working tool of the hammer drill.

To lubricate the shanks of the working tool, manufacturers produce a separate grease that meets the requirements for lubricating open and closed grooves. Such greases have been developed and are widely used, for example, Bosch released grease for bosch rock drill drills, which are used to lubricate the shanks of working tools.

Chuck device

The main difficulty lies in the concept of how the drill is attached to the chuck and does not fall out, while making a reciprocating motion. To understand this, it is enough to look at the shank of the tool, which has four slots, two openings, i.E. To the end of the shank, two closed. Two closed grooves are intended for fixing the shank, the length of the groove provides free movement of the working tool during operation.

The two open slots are responsible for ensuring the correct direction when and when inserting the tool, that is, they are responsible for the correct position of the shank.
Through the closed grooves, the drill is fixed with special balls, which rigidly fix the tool, while leaving a longitudinal free entry within the groove length.

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Design and principle of operation of the SDS chuck

A special clamping device providing impact function and reciprocating movement of the working tool is called SDS chuck. (see fig. 2) This device is a quick chuck that does not need to be rotated to clamp the drill. In order to fix the working tool, it is enough to press on the chuck clamp and insert the shank into the socket.

Rock Drill Lubricant

From the many various publications on the Internet, from which it is difficult to understand the need to lubricate the tips of the hammer drill bit. Some authors argue that it is not necessary to lubricate the shank grooves as this causes the adhesion of abrasive dust and serves for more intensive wear of the rubbing parts, some argue that the more lubricants, the better, and some argue that lubrication is necessary, but only in a very thin layer oils. Let’s try to form our opinion on what kind of lubricant to lubricate the drill bit. To do this, you need to understand the design of the perforator drill attachment.

Rotary hammer drill lubricant how to use?

To do this, it is enough to squeeze the mixture out of the tube into the open grooves and distribute it evenly over the entire length of the groove, and for closed grooves it is necessary to lubricate with a napkin without leaving a “thick” layer. After the end of the work, the shank must be thoroughly wiped off so that it is clean during storage, the residual film of lubricant is sufficient to prevent the metal from rusting. In addition to the Bush company, similar lubricants are produced by companies: Makita, Metaba, Interskol.

Why do punch elements need lubrication

Lubricant, including that used for a perforator, is a viscous substance, the use of which is necessary to reduce the coefficient of friction between structural elements of a mechanical device moving relative to each other. Thus, the lubricant only reduces friction, but does not completely eliminate it, therefore, the lubricating composition is gradually saturated with wear products of rubbing parts with metal dust. As a result, not only does the viscosity of the lubricating composition change, but it itself becomes the cause of more intensive wear of the equipment.

Over time, the grease becomes dirty and loses its properties

How to choose the right lubricant for a specific rock drill model? First of all, it is necessary to take into account the recommendations of the equipment manufacturer, which necessarily indicates both the required type of lubricant composition and the frequency of its replacement. It is especially important to be guided by such recommendations before the warranty period for the hammer drill has expired. Otherwise, in the event of a device breakdown, you will not be able to take advantage of the manufacturer’s warranty obligations.

After the expiration of the warranty period, many owners of rotary hammers begin to use not proprietary formulations for lubrication, but their cheaper counterparts lithol or solidol. Of course, such lubricants are not able to harm the structural elements of the perforator, but when using them, it should be borne in mind that they should be replaced much more often.

Gearbox lubrication

The hammer drill reducer is the most complex structural unit of the device, therefore it requires special attention. It is not so difficult to lubricate the hammer drill gearbox, but self-assembly of a pre-disassembled unit can cause serious difficulties. If the hammer drill is still under warranty, then it is best to contact a specialized workshop with a question about lubricating its gearbox, which provides warranty service for such equipment.

A detailed diagram of the device of your punch will help you understand the mechanism and correctly assemble the tool

If the hammer drill you own is not covered by any warranty or the warranty period for your equipment has already expired, and the authorized service center is far enough away, you can lubricate the gearbox yourself, observing the maximum accuracy and care. To do this, you need:

  • A set of locksmith tools with which you will assemble and disassemble the perforator gearbox;
  • Clean rags;
  • The composition itself for performing the lubrication.

Native grease for the Makita P-08361 gearbox. Refueled upon initial tool assembly and recommended for maintenance

It is better if the lubricant is a proprietary agent specially designed for equipment of a certain brand. So, it can be grease for a Makita rotary hammer or grease for a Bosch rotary hammer. If you do not have a branded lubricant, but you cannot buy it, you can also use inexpensive domestic lubricants.

It is very important that you have instructions for the hammer drill you are going to lubricate. Naturally, if you are the owner of a Makita or Bosch hammer drill, this should be a manual for the equipment of these particular brands.

All parts of the gearbox must be completely cleaned of old grease

Having carefully studied the instructions for the hammer drill, you can begin the procedure for lubricating its gearbox.

  • Before disassembling, the rotary hammer should be well cleaned of dust.
  • When disassembling the gearbox, it is advisable to immediately remember how the elements of its design are located in it. It should be borne in mind that it is not recommended to disassemble and lubricate the gearbox immediately after using the hammer drill. This is explained by the fact that the still hot parts of the gearbox can lose their physical characteristics when a cold lubricant gets on them.
  • After all component parts of the gearbox have been removed from its housing, they should be thoroughly washed with gasoline or spindle oil and wiped dry.
  • The inside of the gearbox housing must also be washed, wiped clean (as far as possible) and allowed to dry completely.
  • When disassembling the perforator gearbox, you can pay attention to the fact that there is no lubrication on some elements of its design. This only means that such parts do not need lubrication and there is no need to apply it to them.
  • As mentioned above, it is better to use a proprietary lubricant for the gearbox of a drill or hammer drill, which has a number of advantages. In particular, branded lubricants retain their original characteristics much longer, so they can be used much less frequently. In addition, the proprietary lubricant composition has such an important quality as water resistance, so it effectively protects the metal parts of the hammer drill from moisture and, accordingly, from corrosion. As a good alternative to branded lubricants for a hammer drill or drill gear, you can use Metabo oil, the cost of which is quite affordable.
  • After lubrication of all elements, the gearbox must be carefully assembled following the reverse sequence.
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Before performing this procedure, the tool shank must be thoroughly cleaned. After that, a special lubricant for rock drill drills or regular lithol is usually applied. In addition, if an open-type cartridge is installed on the perforators, it is advisable, after wiping it, to process its oil seal, which will provide more reliable protection of the inside of the device from dust entering it.

Hammer drill bit lubrication

Lubricant selection

A versatile and relatively inexpensive lubricant that can be used on most modern rock drill models is diesel oil. Compounds based on graphite are actively and successfully used to lubricate rock drills. Such compositions, in particular, are used to lubricate open-type worm gears.

Gearbox and Rock Drill Bits Lubrication: Proper Tool Care

Rotary hammer lubrication extends its life and makes its use more efficient. In order for the effect of the lubricant to bring the expected results, when choosing it, one should take into account not only the characteristics of the lubricant, but also the technical parameters of the device for which it is planned to be used. When choosing how to lubricate a rotary hammer, one must also bear in mind the fact that different parts of such equipment need different types of lubricant.

Correct Lubrication of the Rotary Hammer Gearbox

There is an opinion that the presence of grease on the moving elements of the rock drill allows you to postpone its replacement for a long time. Meanwhile, this opinion is fundamentally wrong, and in order to change it, it is enough to get acquainted with the principle by which lubricants work.

Taking proper care of your hammer drill

The hammer drill is a hybrid of two types of equipment used to create holes in different materials. Unlike the classic hammer drill, such a drill has some design flaws, which makes its maintenance more difficult and not very convenient. Such disadvantages, in particular, include:

  • Lack of a special container into which the lubricating composition is poured;
  • The complexity of servicing the cartridge due to the peculiarities of its structure.

The main care of a drill with the functions of a hammer drill is that after each use, the drill of such equipment (including the tail) must be well cleaned of drilling waste, and before inserting such a tool into the drill, a small amount should be applied to its shank lubricants (you can use ordinary grease). Excessive lubricant on the shank will not harm the tool and equipment used, but may adversely affect the appearance of the surface you are drilling, as excess lubricant will spray out from the rotating chuck.

Impact Drill Gear Lubrication

As a rule, drills with the functions of a perforator are purchased for domestic use, since their price is quite affordable, and they do quite well with their functions when performing simple repairs around the house. Despite the fact that these power tools have the features mentioned above, maintenance of the rotary hammer drill is not time-consuming and does not cause problems even for inexperienced users.

Equipment overheating reasons

Many home craftsmen have a question about how to use a hammer drill so that the housing of its gearbox does not overheat. First of all, you should find out the reason for the excessive heating. One of these reasons may be too much grease in the inner part of the gearbox, which also negatively affects the performance of the device.

The reason for the intensive heating of the perforator gearbox may be that an insufficient amount of lubricant is supplied to its internal parts. This can happen when the hammer drill is used for too long in chiseling mode.

Through this hole in the punch body, grease is periodically added during operation

Another common cause of device overheating is clogged holes that supply cooling air to the hammer drill motor. In such cases, it is necessary to thoroughly clean the rotary hammer from dust and put it in the normal drilling mode for a while. When operating in this gentle mode for about half an hour, the temperature of the gearbox housing should drop.