How to change the bearing on a rock drill

To install the mode switch in the case, you need to perform some actions:
insert the switch to the “drilling” position into the seat until it clicks;
move the switch counterclockwise to the “impact” position;
move the switch with a click counterclockwise to the “drilling” position;
insert the spring and the red button;
insert the overlay from above until it engages.
Mode switch assembled.

At the second stage, you should disassemble the quick-release chuck and repair the hammer drill chuck with your own hands. By the way, the cartridge requires disassembly only for the Makita 2470 models. The cartridge device is quite simple, and any person who has a little bit of locksmith skills can handle its repair.

8 comments on How to repair the Makita HR 2450 rotary hammer if the impact mode is missing

Good day, please tell me Makita 2450: I replaced the barrel (I took it in the assembly), replaced the piston, the ring on the drummer, but there is practically no impact, only at low speeds and then every other time.

Check the splines on the drunk bearing

The article is kind, but I can’t understand how the striker repair kit gum is located.

I have not seen a better description, thanks to the author.

instead of replacing the barrel, he replaced the bushing (broken), but on BOSH 1610290029 they call it a scraper. Assembled checked (drilled two holes for fasteners F8 works), let’s see how it goes next. Cost 120R. and lubricants.

Please tell me how to remove the drill from the cartridge if it turns out to be defective and so as not to harm the cartridge

How long did you work with a drill jammed in a chuck? It can be assumed that the shank was riveted due to poor quality drill material. There is also a possibility of cranking in the chuck. You can try to pull out the stuck drill by holding it in a vice and, shaking, pull the drill towards you. You can use any lubricating fluids. But in the case of a very strong deformation, this method is unlikely to help. Then it is better, if possible, to contact the workshop. An attempt to disassemble the hammer drill and knock out the drill yourself without appropriate experience can lead to the failure of the hammer drill itself.

Given the popularity of the TM Makita power tool in our country, replacing the cartridge on the Makita 2450, Makita 2470, Makita HR2300 and other common models remains a steadily demanded operation. This unit is subject to colossal loads, which aggravate dust and mechanical fractions that gradually penetrate into the internal cavities.

The answer to the question of how to change the cartridge on the Interskol, Metabo, Devolt, Hitachi, etc. perforator. does not depend on the brand or model of the tool, but on the type of installed chuck. they are the same for the products of all manufacturers.

The punch chuck can be:

Each of these units is repairable, but in case of severe wear or the appearance of fatal defects, only the use of a new cartridge will help to restore the hammer’s performance.

To install the mode switch in the case, you need to perform some actions:
insert the switch to the “drilling” position into the seat until it clicks;
move the switch counterclockwise to the “impact” position;
move the switch with a click counterclockwise to the “drilling” position;
insert the spring and the red button;
insert the overlay from above until it engages.
Mode switch assembled.

At the second stage, you should disassemble the quick-release chuck and repair the hammer drill chuck with your own hands. By the way, the cartridge requires disassembly only for the Makita 2470 models. The cartridge device is quite simple, and any person who has a little bit of locksmith skills can handle its repair.

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How can you remove the cartridge from the punch

First of all, here it is necessary to understand the design features of this unit. Two types of cartridges are installed on perforators. key and quick-clamping. However, the first one can be found today only on some models. Accordingly, the main thing here is the quick-release. It should be noted that there are several varieties of it:

• SDS-top;
• SDS-quick;
• SDS-max;
• SDS-plus.

They differ in some design features. For example, the SDS-max keyless chuck is installed on powerful dimensional models. The thing is that there are 3 elongated asymmetric slots through which torque is transmitted. The nozzle shank, in turn, is fixed in oval-shaped grooves. This design is very reliable. SDS-plus chucks no longer have 3, but 2 slots, and they are arranged symmetrically. Well, the shank is fixed here in the same way, that is, with the help of 2 oval grooves. Such cartridges are installed on hammer drills weighing less than 8 kilograms. Well, the remaining 2 types are kind of intermediate options.

However, if you need to remove the cartridge from the punch, then its design in this case does not really matter. important here is how this unit is attached to the tool shaft. There are 2 connection options. threaded and tapered. In the first case, the cartridge is simply screwed into the inner channel. Accordingly, when replacing, it is imperative to clarify the type of thread. As a rule, the manufacturer indicates the necessary information on the punch body. To make such a connection more reliable, a special locking screw is provided. Remove the cartridge very carefully here. After all, damage to the thread can turn into a much more expensive repair.

The taper connection allows brute force to be used when disassembling the tool. This is explained by the features of this design. The thing is that here the end of the punch shaft is made in the form of a cone. The inner channel of the cartridge has a similar shape. over, both elements are made of metal. Thanks to this, the use of force is allowed during the disassembly process. True, it is still recommended to refrain from excessive efforts. Disassembling the tapered structure is quite simple. The removable element is easy to access. Well, in itself, such a connection is very reliable.

Let’s look at the sequence of actions in general when removing the cartridge from the hammer drill. The first example is a key threaded design. Here we need to proceed as follows. First of all, open the cartridge completely. A screw can be seen at its bottom. Take a screwdriver and unscrew it. In some cases, it is not possible to do this the first time. Finding yourself in such a situation, do not despair. Place a screwdriver against the screw head and tap the handle with a hammer. By doing this, you will help loosen the fasteners. As a result, the screw will still be unscrewed. After that, it remains only to clamp the chuck itself and rotate the spindle. As you can see, there is really nothing complicated here. The whole work will only take a few minutes, even for a person who has never encountered such a thing before.

The keyless chuck is also very easy to remove. Let’s take as an example a hammer drill from one of the most popular manufacturers today. Bosch. However, this design is also found on the instrument of a number of other brands. So, first of all, we need to shift the plastic cover to the side, after which it will be possible to remove the rubber seal. Next comes the turn of the fixing ring. After it is removed, move on to the puck. Now in front of us will be the second ring. It must first be turned, and then removed, after prying it off with a screwdriver. This gives you access to the SDS clamp. There is very little left. You just need to remove the small ball, washer and spring. in this sequence.

That’s all. Both in the first and in the second case, no difficulties should arise. After the cartridge is removed, it is recommended to disassemble the equipment and see the state of its elements. One of the most common repair problems is the wear of the rubber pad. Because of this, dust begins to accumulate inside the cartridge. It is not difficult to eliminate such a problem. it is enough to clean the inside of the unit from dirt and replace the gasket with a new one. Another possible option is wear of the retaining ring or loosening of its fasteners. Here, too, an element replacement is required. Wear on the guide or ball is also possible. Both elements, in case of such problems, must be replaced. If the cone spring is deformed, then it can be replaced or turned with a smaller top towards the gearbox.

Quick Release Chuck Assembly Procedure

The assembly is done on a clean surface. Parts are pre-washed, dried and lubricated with a thin layer of the recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. All incoming parts of the cartridge are assembled on the shaft in a certain sequence. Installing the conical spring (pos. 6), put on the guide washer (pos. 5) and fix it with the ball (pos. 20), inserting it into the groove of the gearbox shaft. It remains to put on the ring (pos. 4, clutch cover, pos. 3, fix the parts with the locking ring pos. 2. At the last stage, insert the protective tip, pos. 1, into the end of the cartridge.
the repair of the Makita 2450 perforator cartridge is over. It remains to check its quality by inserting a drill into the cartridge. When properly assembled, the chuck keeps the drill from falling out spontaneously.
Cartridge assembled.

The punch of a punch disappeared. what to do?

As you know, nothing is eternal. And reliable technology breaks down. Somehow, in the midst of work, he stopped hammering. In rotation mode, the machine worked, but the blow suddenly disappeared.

The gearbox was disassembled and the cause of the breakdown was identified. A bushing was broken in the barrel body, in which the striker (firing pin) directly carries out percussion work. As a result, the drummer got stuck in the fragments of the collapsed bushing.

The service center advised to replace the barrel completely. It turned out that the bushing is pressed into the barrel at the factory and is not supplied separately. Had to buy a whole new barrel.

In this article we will tell you how to bring the hammer drill into working order yourself after this, in general, simple breakdown. If you have the skills to repair power tools and a desire not to pay someone your hard-earned money, then we take the tool and start disassembling the machine.

Chuck replacement procedure

The most frequent breakdowns requiring replacement of the unit are if the chuck is jammed in the Makit, BlackDecker, Ryobi or any other perforator, or if it is not possible to fix the rig during installation or during operation. Most models are equipped with chucks that have a threaded connection with a spindle. For their dismantling and installation, a minimum set of tools is required: a flat-blade screwdriver, open-end wrench, hammer.

Due to the structural similarity, the replacement of the cartridge on the Bosch perforator (Bosch), Makita or Interskol is carried out according to a single algorithm:

• after opening the cartridge, unscrew the fixing screw. tapping with a hammer on its head will help in case of difficulties;
• holding the cartridge in the wrench, scroll the spindle and remove the faulty cartridge;
• screw on the new assembly until it stops and fix it with a locking screw.

You can save yourself from looking for a new cartridge and efforts to replace it by contacting the service center “Successful Technique Service”. we will solve this problem with high quality, extremely quickly and at an affordable price.

Due to the ingress of dust, dirt and moisture, the internal lubricant becomes hard over time and does not fulfill its intended purpose. The hammer drill starts to work with abnormal noise. When starting to repair a hammer drill, be sure to read the attached instructions for disassembly, lubrication, and assembly of the Makita 2450, 2470 hammer drill units. The Makita 2450 and 2470 hammer drill diagram will help you to properly disassemble faulty units and find defective parts. We will also tell you how to disassemble the Makita 2450 puncher.

Dismantling the Makita 2470 perforator begins with removing the mode switch knob.

Causes and signs of breakage

During intensive use of a concrete mixer, one of the 2 bearings most often breaks. Signs of its failure:

• extraneous noises in the drum, similar to crunching or crackling;
• sudden stop of the drum even at low loads;
• slow start of the unit;
• noticeable backlash when rocking the bowl by hand.

Please note: for a concrete mixer, you need to change 2 bearings at once, even if the second one is completely serviceable.

There are several reasons why a part fails prematurely. The most common is unit overload. With an increase in the permissible load on the equipment (all standards are indicated in the technical documentation), the bearing assembly breaks down much faster.

Other less common causes include moisture, sand, small stones, or other foreign matter getting under the bearing housing. And also the unit fails due to a previously installed low-quality part.

To prevent premature bearing failure, it is necessary to clean the unit from the remnants of adhered concrete after each use, and also make sure that moisture, dust and sand do not get into the mechanism. There is no need to overload the equipment and try to make more concrete mix at a time than is acceptable in the recommendations from the manufacturer. It is important to properly care for the mixer and perform timely maintenance.

How to remove a bearing from a drum?

To remove the damaged part, you need to get to it. for this you will have to disassemble the mixer. First of all, turn the container over so that the traverse is at the top. After that, using a wrench, you need to unscrew the bolt connecting the equipment shaft to the crosshead. Further it is necessary:

• remove the washer and grover;
• knock out the shaft from the traverse (for this, an insert with suitable dimensions and a hammer are used);
• disconnect the drum from the bed;
• remove the adjusting washers.

The next step is to detach the support structure from the pear. Many craftsmen warn that the retaining nuts located on the outside will rust over time. Such a negative process is inevitable, since the installed hardware comes into contact with moisture when preparing the working solution. To facilitate their removal, it is recommended to pre-treat the nuts with wd-40. After 10 minutes, you can try to unscrew the fasteners.

If the nuts are too rusty, they need to be cut off with a grinder.

After removing the fasteners, it is necessary to separate the bowl support from the drum, then separate it into 2 parts. To do this, knock out the shaft with bearings. Damaged parts are dismantled using special pullers or a vice.

Required tools

If you need to change the bearing of a concrete mixer, you can resort to the services of craftsmen. However, this will take time and will require serious financial investments. To save money, it is recommended to do it yourself. It is not difficult to set up the unit yourself. To do this, you need to arm yourself with the necessary tools and theoretical knowledge.

For work you will need:

• 2 new bearings (standard part size 6203);
• a set of wrenches of different sizes;
• hammer or sledgehammer;
• Bulgarian;
• metal insert;
• thinner or gasoline for cleaning parts;
• a solution designed to “oxidize” the bolts (wd-40 is suitable for this purpose);
• screwdrivers of various configurations and sizes;
• pliers and pullers (vise can be used instead).

It is recommended to prepare the necessary accessories in advance. having everything at hand, you can quickly cope with the work without being distracted by the search for the right tool.

Separately, it should be said about the choice of bearing. They are of 3 types. caprolon, bronze or steel. The former are the most popular. When choosing, you need to give preference to parts with a washer. they are able to withstand large mechanical loads and protect the internal device from the ingress of mechanical particles.

How to change a bearing on a concrete mixer?

• Causes and signs of breakage
• Required tools
• How to remove a bearing from a drum?
• How to replace?

Household concrete mixers are mechanical (manual), with an internal combustion engine or electric drive. All of these species have a similar design. When preparing a concrete solution in a mixer, the bearing assembly is subjected to the greatest load. Over time, even if the rules for operating the equipment are followed, it fails. In the event of a breakdown, you should not look for a replacement for the broken unit. the bearing on the concrete mixer can be changed with your own hands, returning the functionality to the mixer.

How to replace?

Before assembling the unit, it is recommended to pre-clean the shaft from dirt and rust using gasoline or an acetone-based solvent. After removing the formations on the parts, the new bearings should be pressed onto the shaft. For this, it is convenient to use a special puller. In its absence, pressing is carried out by the method of uniform tapping with a hammer on the inner races of the bearing assemblies. These work must be carried out carefully, tapping should be carried out through a block of wood.

The next step is to install the shaft in the lower part of the support, fix the second half on the upper bearing. After the performed manipulations, you need to fix the support to the drum using bolts, nuts and washers. To prevent the bolts from turning inside the structure, they must be held with a wrench. in this case, you cannot do without help. Before fixing the support, its perimeter should be processed in the areas of contact with the drum, for this you need to use any silicone-based sealant. Thanks to this additional processing, the bearing unit will be reliably protected from accidental moisture penetration.

The last stage includes the planting of the adjusting washers, the installation of the shaft in the hole and its fixation with the clamping bolts.

After the performed repair manipulations, it is necessary to assess the performance of the concrete mixer. To do this, you need to turn on the equipment at idle, no load.

Timely replacement of the bearing is important. neglect of such work often leads to breakdown of other units of the unit and their more expensive adjustment. The instructions given in the article will help to carry out high-quality repairs of a worn out part, which, in turn, will help to extend the life of the equipment.

For more information on how to change the bearing on a concrete mixer, see the next video.

Automotive generator design

Two parts. movable (rotor) and stationary (stator). Both contain windings. excitation (on the rotor) and generating (on the stator). There is one winding on the moving part, it has two leads that are connected to cylindrical contacts. The fixed part is more complex, it has three windings connected in a star. The beginnings of the windings have a common point. the mass, and the voltage is removed from the ends.

If voltage is generated at three terminals, then three phases are generated? Indeed, a car generator produces a three-phase alternating voltage. But is direct current used in the on-board network? That’s right, then one important element is included in the work. the rectifier unit. It consists of six high-current semiconductor diodes connected in a three-phase rectifier circuit. From three phases of alternating current we obtain direct current.

But there are still difficulties. These include noise and power surges. The first ones leave safely if a capacitor with a large capacity is connected to the output of the rectifier unit. It smooths out ripples and removes various interference from the on-board network. And the armature turns are not constant, therefore, the output voltage can vary in the range of 12.30 Volts.

Therefore, stabilization is needed. For this, a relay-regulator is used in the design, which maintains the operating voltage in the on-board network (13.8-14.8 Volts). Most often, the relay-regulator is combined with a brush assembly, with the help of which the excitation winding is powered. If we stabilize the voltage supplied to the excitation winding, then we get voltage stabilization at the generator output.

How to change a bearing on a generator

• How to change a bearing on a generator
• How to disassemble the generator
• How to replace a VAZ 2108 generator

The basis of a modern car is not even a fuel system, but electrical equipment. Reliability and convenience of the driver and passengers depend on its quality. Any car uses two power sources. a battery and a generator. The first is necessary to power the on-board network when the engine is stopped, as well as to start it.

And the generator is needed to provide power to the network while the engine is running, as well as to recharge the battery to the desired level. And if the battery does not have moving elements, it consists of lead plates immersed in an acid solution, then the generator is a unit that consists of a movable and fixed parts.

The generator armature is driven from the engine crankshaft. The belt drive is most often used, since it is reliable and its adjustment is very simple. To make a repair, you need to know what parts the generator consists of. Understanding how it works doesn’t hurt either.

Dismantling the generator and replacing bearings

How to change the bearing on the generator correctly? After all, the anchor is constantly in motion when the engine is running. There are bearings in the front and rear covers. To change them, you need to completely remove the generator from the car and disassemble it. Sequencing:
unscrew the nut that secures the generator to the bracket;
loosen the belt and remove it;
remove the lower bolt by unscrewing the nut from it;
remove generator.

And then you need to remove the pulley, and then disconnect the front and rear covers. Most often, the bearing, which is located on the front cover, is destroyed, since it is on it that most of the loads fall. This bearing has several times less resource than the one on the back cover.

On the front cover, the bearing is covered with a plate, which is attached to the housing with two bolts. Using a piece of tube (or a similar old bearing), we press out the bearings from the covers. We take new ones and install them instead of the old ones. If necessary, you can use an old bearing for pressing. This completes the replacement, the assembly of the generator begins.

Drill Press Center Pulley Bearing Replacement

• How to change bearings on a generator
• How to remove a generator
• How to disassemble the generator

Dismantling the generator

First you need to disconnect the minus terminal from the battery. Then unscrew the main (thickest) wire from the generator, remove the thinner wires from the jacks. Now you can unscrew the nuts securing the generator itself. Their number may vary on different car models. most often there are two or three attachment points. After removing the generator, it is necessary to dismantle the pulley together with the impeller. To do this, it is enough to unscrew the nut with a spring washer, securely locking the pulley. Remove it and carefully remove the key from the groove.

How to change bearings on a generator

Dismantling and installing bearings

It is recommended to replace both bearings at the same time. One of them is located in the generator cover. To reach it, you need to unscrew some of the mounting bolts holding the bearing cover on the drive end. An open bearing can be pressed out with a suitable mandrel. Take the part in your hands, swing it by the inner ring, rotate. The slightest backlash, sticking indicates the need for replacement. Look carefully at the bearing markings and record the data. And best of all, take the part and go shopping with it. Before installing a new part, remove the protective plastic cover from it and fill the bearing with grease (Litol 24, for example). This spare is mounted flush with the cover. During installation, you can only lightly hit the outer race of the bearing being installed, however, ideally, it is better to use a hydraulic press.

The second bearing is located at the end of the armature shaft. You will also need a puller to remove it. The new part is also lubricated with a suitable grease and pressed against the stop on the shaft. In this case, light blows can only be applied to the inner bearing race. The assembly of the generator is carried out in the reverse order. After installing it on the engine, be sure to correctly adjust the belt tension. Too much slack will lead to belt slippage, and excessive tension will lead to rapid wear of the alternator bearings.

How to disassemble a punch chuck?

Sometimes the foreman is faced with the need to disassemble the cartridge for various reasons: whether it is repair, tool cleaning, lubrication or replacement of certain parts. For proper disassembly of the punch cartridge, first of all, you need to know the manufacturer’s company, since the parsing process depends on this point.

Among the modern manufacturers of electric rock drills, the most popular are Bosh, Makita and Interskol. These brands have managed to establish themselves in the construction market as a manufacturer of quality products.

In principle, there is not much difference between the device of perforators from different companies, but there are small nuances that are quickly resolved as the cartridge is disassembled.

Consider how to disassemble a chuck from Bosh electric drills, since this brand is the most popular and purchased.

First, you need to move the plastic part and remove the rubber seal. Using a screwdriver, it is necessary to very carefully remove the ring that fixes the structure and the washer. There is another fixing ring under this part, which must be turned, and then pry off with a tool and remove.

Next is the SDS clamp, which includes three parts: washer, ball and spring. SDS must be disassembled strictly according to the rules: first of all, the ball gets, then the washer, and the last comes the spring. It is important to follow this sequence in order not to damage the internal structure.

Assembling the chuck is as easy and quick as disassembling. You just need to repeat the previous steps exactly the opposite. that is, from the last point to the first.

How to remove a cartridge from a punch?

First of all, you need to understand the type of chuck used inside your power tool. There are three of them: quick-clamping, cam and collet SDS.

Quick-clamping is additionally divided into subspecies: single-sleeve and double-sleeve. The easiest way to change a part is on the SDS collet version. In this case, you just need to turn the drill. In the cam and quick-release type, the part is fastened with a key, so you have to work here.

Once the type of cartridge used is determined, you can proceed to the next stage: it is necessary to study the mount, due to which it is held.

The drill is mounted either on a screw rod or on a spindle. As a rule, the parsing process takes place quite quickly and without problems, but there are cases of too tight fixation, which will take time and some additional tools to disassemble. In the first case, to remove the part, you will need to stock up on a hammer, wrench and screwdriver.

In order to remove the cartridge, you will need to perform the following steps:

• Reduce the fixation of the drill by lightly tapping the tip with a hammer;
• unscrew using a screwdriver;
• clamp the part in a vise or wrench, and then rotate the spindle.

How does a hammer drill work from the inside?

Professional craftsmen recommend that you always have at least one replacement drill chuck in stock to play it safe, as you may need it at any time. They also advise using different drills for each type of construction work.

There are several types of chuck, however, the main ones are keyless and key. The first option is optimal for craftsmen who change drills several times during a workflow, the second is suitable for large parts. Not every newcomer to the repair business understands the need for several types of cartridges, however, they are very important.

The electric tool has different powers.

Models with a high performance need a strong attachment of the nozzles so that they do not fall out during operation. In this case, the SDS-max part is perfect, which assumes a deep fit and prevents the cartridge from flying out of the hammer.

Power tools with less power are designed for more precise and small construction work. For these models, fixation is not so important, the main thing is that the hammer drill can drill a small hole in the right place. In any case, it is necessary to study the drill device from the inside in order to better understand how exactly the part will be replaced.

Modern technology has greatly simplified the design of many electrical tools. Currently, the cartridges are secured using double guide wedges and double locking balls.

Some chucks have a difference in the number of guide parts, for example, SDS max has one more. Thanks to this device, the drills are fixed more reliably and firmly.

Change the bearing and drill chuck

Progress has greatly simplified the fastening of the part. You just need to insert the required cartridge into the hole and press it until it clicks. The drill is firmly fixed. The drill is removed simply. you just need to press on one of the caps and remove the drill.

As a rule, many electric rock drills are equipped with additional functions that greatly facilitate the process of construction work. For example, some have an electronic or brush reversing system, the ability to regulate the number of revolutions, an anti-vibration system. Many companies also equip rock drills with a quick change drill system, an immobilizer, a function to prevent chuck from jamming, and special indicators that indicate the degree of wear of the chuck. All this contributes to a more comfortable work with an electric tool and allows you to speed up the process.

Punch chuck: how to remove, disassemble and replace?

• How to remove a cartridge from a punch?
• How does a hammer drill work from the inside?
• How to disassemble a punch chuck?
• How to insert a chuck on a hammer drill?

The reason for replacing the chuck with a drill can be both external and internal circumstances. It will not be difficult for professionals to disassemble, remove and replace the desired part, but beginners may have some difficulties with this task.

In this article, we will look at how to properly change the cartridge on the hammer drill.

How to insert a chuck on a hammer drill?

In order to insert the chuck into the hammer drill, you must do the following: screw the drill onto the tool (and it is important to screw it all the way to the end), then insert the screw into the socket and then tighten it to the very end using a screwdriver.

You will learn about why drills can fly out of the hammer drill chuck in the video below.