The drill does not hold in the hammer drill

Chucks used by the tool

How to insert a drill into a hammer drill? The SDS cartridge was invented for quick installation of the nozzle and its change. This mechanism was developed in the 30s of the last century. To fix the drill in the device, you just need to insert it, slightly turning it, feel the grooves and click it into place. The SDS mechanism aligns the balls with the shank slots and locks it securely. In order to remove the nozzle back, you need to push the chuck towards the perforator body and pull out the drill. To make the shank fit easily into the chuck, you need to lubricate it with graphite grease. This will also improve the sliding of the balls into the grooves. Repeat the procedure as the grease dries.

What is a puncher

With the widespread use of the hammer drill, construction and repair work has become much easier. Indeed, in cases in which it is required to drill holes in concrete, brick, asphalt, this device is irreplaceable. Wherever hammer drilling is required. It is also used for drill-specific tasks, although the hammer chuck is different.

drill, does, hold, hammer

This tool has three standard features:

  • drilling without impact;
  • drilling with a special hammer drill;
  • punching holes with chisels, lances or blades.

Another difference between a hammer drill and a drill is that it has a lot of power. It starts at 700 W and goes up to 3 kW.

Possible cartridge malfunctions and their elimination

Frequent cartridge malfunction. impossibility of fixing the nozzle. The inserted drill flies back during operation. There is a simple reason for this, and everyone can fix it on their own. To do this, you need to disassemble the cartridge:

  • Remove the rubber boot by prying it off the end with a small flat screwdriver.
  • Remove the retaining ring with the same screwdriver.
  • Remove the plastic boot.

After that, the entire mechanism becomes visible. Most often, such a malfunction is caused by the wear of the steel ring that fixes the balls of the SDS mechanism. Constant shock loads wear out the ring walls, rendering it unusable.

How to assemble repair find problem Makita rotary hammer drill HR2470FT HR2470

To eliminate the cause, replace the retaining ring with a new one. Then put everything together in reverse order.

Drill chucks are not designed for shock loading. What if it is out of order? To begin with, determine the nature of the breakdown. If the key slips when tightened, then you just need to replace it. In the event of a malfunction of the internal mechanism, it is necessary to replace the cartridge itself on the shank. To do this, you should:

  • Clamp the shank in a vice.
  • Expand the collet to the maximum diameter.
  • Unscrew the screw that will be inside. Attention: the screw has a non-standard left-hand thread. So, you need to unscrew it clockwise.
  • Remove the chuck from the shank and install a new one.
  • Tighten the screw.

Before you insert the drill into the hammer drill with a new chuck, you should check its performance.

Is it possible to insert a drill of a conventional drill into a hammer drill?

The drill of a conventional drill is different. There are no grooves, no grooves, no hooks on its shank. However, for drilling metal you need just a simple one. How to insert a drill into a hammer drill in this case?

For this, a removable chuck is used, which has a shank, like a conventional nozzle, and is inserted into the SDS mechanism. These cartridges come in two flavors:

    Cam type. It is a key operated collet. There are teeth around the perimeter of this chuck that form a gear. The wrench meshes with these teeth and the torque is transmitted through the gearbox to the collet mechanism, clamping or releasing the drill.

Used attachments

The list of works performed by the puncher is great:

  • drilling;
  • cutting holes of large diameter;
  • chiselling;
  • chipping.

To accomplish these tasks, various attachments made of durable materials are used.

For drilling holes in concrete or brick, there are high-strength steel drills with victorious tips. There are several types of shanks to fix them in the chuck:

  • SDS plus. This variety is the most common. It is used for drills with a diameter of 4-26 mm.
  • SDS max. This type of shank has a longer bore. They are used in heavy, high power tools. The diameter of these drills is over 26 mm. The length of these drills. from 25 cm to 1.2 m.
  • SDS quick. This is a rare type of shank. They are used in rock drills “Bosch”. How to insert a drill with a similar shank into a conventional tool? To do this, you need to change the cartridge.

On the tail end, all attachments are identical. The working part differs depending on the function:

  • Drills are used to drill holes. The difference in tips will depend on the hardness of the material to be drilled.
  • Crowns are used to cut large diameter holes. For example, for an outlet or for a plant in a water pipe room.

How to insert a drill into a hammer drill: instructions for use, operation and repair

Electric hand tools have gained a lot of popularity in recent years. One of the most popular is the hammer drill. It is used in any production and domestic environment.

Correct use of this tool will not only extend its service life, but also save on consumables. Rotary hammer drills differ from those used in drills, which means that their mounting method will be different. How to correctly insert the drill into the hammer drill, consider below.

If the drill is stuck

It happens that in the process of work, an unlubricated shank leads to seizure. The fixing mechanism is packed with drilling dust and the drill cannot be pulled out. What to do in this case? No need to panic or immediately run to repair. The use of penetrating lubricants will solve this problem. These products are available in aerosol cans and have a low consistency. Therefore, they operate in places that are difficult to access. To remove the drill, you need to inject grease directly into the drill hole and leave the tool alone for 10-15 minutes. Then, with smooth, rocking movements, remove the drill.

It must be remembered that before inserting the drill into the hammer drill, the shank must be lubricated. This will save the patron for years to come.

Reasons for jamming

This kind of problem occurs in two cases:

  • The drill is stuck in the adapter chuck that is used to insert a conventional drill
  • The part is stuck in the clamping lips of the hammer drill.

The first problem occurs due to the need to use a conventional drill in the work of the drill, which requires a special adapter cartridge for manipulation with a perforator. It is inserted into the clamp of the device.

The second reason for the bit jamming may be the clamping of the hammer drill. This kind of interference occurs in other circumstances. The drill bit rotates around the axis, sometimes performing weak reciprocating movements. This happens due to the transfer of power to the power tool through the lips of the clamping element and the bottom of the chuck.

The hammer drill mechanism transfers energy in a different way, so the drill in the clamp moves differently. The instrument has rotary-percussion and just percussion working functions. Energy is transferred to the device by a special striker, which hits the tail of the installed nozzle.

The attachment has special grooves that are firmly fixed in the clamping element, ensuring the transfer of torque. Poor-quality nozzles are made of a soft alloy that does not lend itself to heat treatment, as a result. the tails do not withstand the load and become unusable.

How to remove a stuck drill from a hammer drill?

Repair work most often requires the use of a tool such as a hammer drill. They are drilled holes and dismantled surfaces. Any power tool is subject to stress during operation, and this gradually leads to malfunctions. Often, after the completed work process, a problem arises with the removal of the drill from the tool holder. It takes a little work to pull out a stuck drill.

What to do if the drill gets stuck in the hammer drill?

When, in the process of performing a large amount of work, the drill from the opposite side is riveted, it is not possible to pull it out of the hammer drill freely.

There are two ways to get the drill out of the power tool:

  • A stuck drill must be taken in a vice, while holding the tool in your hands, loosen it to the sides and pull it towards you.
  • In a large vice, using rubber pads, so as not to crush the body, a perforator is clamped. Then the drill is clamped with a small vice and a small hammer is easily struck in the direction directed to the exit of the equipment from the chuck.

In both cases, penetrating solutions can be used.

If you cannot pull the drill directly out of the chuck while turning, then you need to remove the parts of the chuck or try to turn the drill back 90 degrees. Turning it usually results in a complete replacement of the clamping element components.

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If attempts to pull the drill out of the device were unsuccessful, then so that the perforator does not finally break down, it is better to seek help from the master.

Ways to help pull out the drill

The rock drill chuck is designed so that the drilling or drilling equipment moves along the borehole during operation. During riveting, the barrel will not allow the drill to come out easily. You can try to get the drill in the following ways:

  • You need to clamp the drill in a vice and then slowly loosen the puncher and pull it towards you.
  • In large tesks, the perforator itself is clamped, but so as not to damage the body. Then the drill is clamped with a pipe wrench or in a small vice, and then you need to hit them with a hammer while knocking out the drill.

In any of these cases, a few drops of WD-40 will not be superfluous. It is very rare for a drill to wedge due to a lack of lubrication or a clogged chuck. The fixation ball, in cases where there is a foreign body under it, will not allow the drill to come out. To avoid this, it is necessary that the shank on the device is always lubricated.

If the drill got stuck due to the fact that it turned in the chuck, then you need to remove the chuck itself, while dismantling the cap and rubber ring, or try to turn it back 90 °. Because of this, you will most likely have to replace all the clamping parts on the hammer drill.

But do not forget that if at the same time the shank is already broken, it will not work to release the drill. In this case, you need to completely disassemble the punch and then knock out the stuck device. But again, after such maneuvers, it will be necessary to replace the barrel.

How to get a drill from a hammer drill?

Nowadays, with construction robots, you can no longer do without a hammer drill. With it, you can drill any hole, as well as dismantle a wall or ceiling. A situation often happens when the drill gets stuck in the chuck and it is very difficult or impossible to pull it out. How do you pull out the drill yourself? To understand this, you need to know the reasons for the appearance of such an urgent problem.

Varieties and causes of drill jamming in a hammer drill

There are two types of this problem:

  • Either the drill is jammed in the chuck or adapter chuck of the drill for operating a simple drill in the hammer drill;
  • the drill is stuck in the hammer chuck.

The first version of events happens at a time when you need to use a hammer drill like an ordinary drill. In these cases, a transitional chuck is used, the same as in an ordinary drill, it is mounted in the clamp of the perforator, and then the drilling process is carried out. After completing the required work, sometimes it is simply not possible to calmly pull out the drill, because the chuck is so tightened that it is impossible to unscrew it. This mainly happens when the clamp has not been lubricated or is heavily clogged.

In order for it to unclench, it is enough to process it with WD-40, or use kerosene. After some time, you need to tap the chuck a little, while trying to shake the drill with the other hand. After that, the clamp should be easily unscrewed. The released cartridge must then be cleaned and greased.

It is quite another matter if the drill gets stuck in the hammer chuck. This is not at all the same as in the first version. A drill or drill in a drill only feels twisting and occasionally small shock loads, which are distributed to them only through the clamping jaws and a continuous stop on the bottom of the chuck. The hammer drill has a completely different stress transmission mechanism and completely different drill kinematics in the chuck. This is because it assumes a reverse-shock or shock direction of transfer of stresses. The devices take energy from a special striker, which is powered by an electric motor and hits their shank. On the surface of the devices there are so-called grooves, with the help of which they are fixed in the chuck and can withstand a reasonable load. Cheap tools use steel that has not been hardened, because of this, the shank can riveted in the hammer drill during prolonged work.

Recommendations for avoiding such cases

When using quality drills, the drill will never get stuck in the hammer drill. But at the same time, you need to beware of fakes, since there are a lot of them at the moment. And in order to prevent such incidents, it is advised to carry out trial work with the purchased device.

There are times when a powerful perforator makes holes in materials for which the inserted drill is not suitable. And then even a high-quality drill will not withstand such loads and rivets.

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.

Bosch Professional Safe Drilling Techniques

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

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-release, cam and collet SDS.

Quick-clamping is additionally divided into subspecies: single-sleeve and double-sleeve. The easiest way to change the 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 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 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.

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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.

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.

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 to the very 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.

Types of modern SDS cartridges

The type of chuck for a hammer drill or any other tool depends on the category of equipment used. Each type of hammer drill or drill, as you know, is designed taking into account the reliable fixation of a tool of a certain diameter. So, depending on the diameter of a drill with an SDS shank, which can be fixed in such a device, chucks of this category are divided into several types: SDS, devices of the SDS-plus category, chuck models SDS-plus, SDS-top, SDS-quick and SDS- max.

The most common are the following models.

These are chucks designed for fixing drills with a shank diameter of 10 mm. The tool, the working diameter of which is in the range of 4–26 mm, and the length does not exceed 1 meter, deepens with its shank into the chuck by 40 mm. With the help of such a drill, it is possible to create an impact load, the value of which does not exceed 5 J. The SDS-plus series chucks are installed on rotary hammers belonging to the light and medium category, the correct spatial position of which relative to the work surface is ensured by the muscular strength of the operator.

SDS-Plus System Cartridge

These chucks hold drills with a shank diameter of 18 mm. The tool, the working diameter of which can reach 60 mm, is set to a depth of 90 mm. Cartridges of this category can be seen on heavy duty rotary hammers, capable of producing an impact load of up to 30 J. It should be borne in mind that professional rotary hammers, which are significant in weight and large dimensions, are best used in a set with special supports and guides that allow you to hold the tool in the required position.

The SDS-max system cartridge differs externally only in length

Chucks for hammer drills and adapters: types, features

Using a quick-detachable chuck for a hammer drill for a drill, which is denoted by the abbreviation SDS, many do not even ask how its mechanism works and on what principle it works. Meanwhile, the appearance in 1980 of such a cartridge, the creation of which we owe to the specialists of Bosch, can rightfully be called a real revolution in the field of equipping the electric tool. To understand how effective a cartridge of this type is, it is enough to decipher its abbreviation, which is composed of the initial letters of the three German words Steck, Dreh and Sitzt (“insert, turn, secure”). The high efficiency of such a clamping device is also evidenced by the fact that over the 25 years that have passed since its development, its design has practically not changed.

Disassembled punch chuck

Bosch did not monopolize the production of SDS clamping devices and granted the right to produce such chucks for drills and hammer drills to all firms that manufacture household and industrial electric tools. Due to this, about 90% of all manufactured electric drills and rotary hammers are equipped with cartridges of this type.

Chucks of other types are also installed on electric drills and perforators (although much less often), which can be used as devices with rigid fixation of the tool, as well as collet and cam chucks. Most often, such cartridges are found on professional equipment, and in the equipment of electric drills and hammer drills for domestic use, mainly clamping devices are used, in the designation of which there is an abbreviation SDS.

Designed for heavy duty concrete work, rock drills can be used in combination with quick-release chucks and for drilling wood or metal

The peculiarities of the operation of cartridges for SDS perforators (like any other type) are that they are subjected to impact and twisting loads during processing. That is why high requirements are imposed on the quality of manufacture of such cartridges. Conveniently, the keyless chuck of the SDS category is quite easy to maintain and repair.

Due to the fact that there is a small play between the drill shank and the inner surface of the SDS chuck, the mechanism of such a device experiences slight radial loads. In this case, all the shock loads that the drill takes on are transferred to the monolithic stop, which is a fixed unit in relation to the structural elements of the chuck. That is why such chucks, installed on a drill or perforator, are highly reliable and have a long service life. However, this statement is relevant only with proper maintenance and lubrication of the mechanisms of such a device.

Design and function of SDS category devices

The design and principle by which the drill chuck of this category works is quite simple.

  • The drill shank has two open guide slots that move along the chuck splines located in its inner part. Due to the interaction of the internal splines of the chuck and the guide slots of the shank, the torque is imparted to the tool.
  • There are also closed grooves on the drill shank, which, when combined with the ball clamps of the chuck, prevent the tool from falling out. The design of the SDS chuck is designed in such a way that no stress is placed on the ball clamps during machining.
  • In order to transfer the shock load to the end of the drill, a so-called hammer is used in the construction of the hammer, which is powered by a pneumatic or electric drive.

Diagram of the clamping drive unit of the perforator

To remove or install a tool with an SDS shank, proceed as follows:

  • by pulling on the movable ring of the chuck, release the ball clamps and remove the drill;
  • lower the ring (thereby fixing it with balls entering the connection with the closed grooves of the shank) to install the drill.

Diagram of SDS-punch chuck

Accessories and tools

In addition to the drills themselves, complete with SDS chucks, you can use various adapters for the hammer drill. This allows you to significantly expand the functionality of the hammer drill and use it to perform various jobs.

Adapters and adapters for equipping a hammer drill allow, simply by changing the tools in it, use such equipment for drilling, use it to drill deep holes in hard materials, and also carry out many other types of work. The hammer drill with its high power will perfectly cope with the tasks that a low-power electric drill cannot solve. Such tasks, in particular, include drilling wood products with powerful drills, making holes in concrete structures using a crown-type tool.

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The operation of the hammer drill with a drill with a cylindrical shank is possible using an adapter, onto which an ordinary cam chuck is screwed

When using a rotary hammer and a hammer drill chuck of the SDS category, it should be borne in mind that the design of such a clamping mechanism assumes the presence of a backlash, so you should not count on high accuracy of work. As a rule, rock drills are used in cases where high power is needed to complete the processing, rather than precision.

Considering the possibility of using adapters for a perforator, it should be borne in mind that with their help, cartridges with more modest characteristics can be installed on equipment with high power, but not vice versa.

Installing a powerful tool using a light or mid-range hammer adapter can cause rapid equipment failure. In addition, if a heavy-duty drill installed in a light or medium grade drill sticks in the hole being created, this could cause the drill to rotate around its axis and cause serious injury. That is why the rotary hammer must be used in a set with drills corresponding to its category.

The convenience of using the punch lies in the fact that for each type of work performed with its help, a special tool has been developed that perfectly copes with the tasks. The use of chucks for the SDS perforator allows you to replace such tools as quickly as possible, which significantly increases the productivity of working operations.

Assembled jaw chuck with adapter

The high efficiency of using such equipment as a hammer drill is also due to the fact that it can be used for processing both in the drilling mode and in the impact mode. Such technical capabilities make the hammer drill a truly versatile device that can be used as both a conventional drill and a jackhammer. In addition, special models of cartridges for the SDS perforator and the corresponding attachments for them make it possible to use such a device as a mixer with which you can effectively mix various building mixtures.

The most significant disadvantages of using rock drills are that their operation is accompanied by loud noise and the formation of a large amount of dust. If special devices can cope with the removal of dust from the processing area when using a perforator, then the specialists have not yet decided how to reduce the noise that occurs during the operation of such equipment.

Service cost by manufacturer

This defect occurs with the following manufacturers:

The cause of the defect does not hold the drill

Based on the experience of our service engineers, we can distinguish the following reasons:

  • Untimely prophylaxis and cleaning of the device
  • Lack of protection against power outages
  • Replacing consumable accessories
  • Not carefully studying the user manual or ignoring the manufacturer’s advice.
  • Not neat use

Bring your equipment to our service centers or call the masters at home and We will repair and give a guarantee. After that, the faulty device will work 100 percent (at full). Addresses of Ymedia services in all districts of St. Petersburg.

How the punch chuck works

The modern rock drill chuck is of the SDS design. Behind this abbreviation are the words Steck, Dreh, Sitz. Translated from German, it means “inserted, turned, secured.” It is in this sequence that the attachments are installed into the perforator. In this case, the type of nozzle does not matter. a drill, a lance or an adapter for a drill. The most common types of cartridges are:

Both options provide quick-release mode for changing attachments.

Dismantling the SDS Chuck

To assess the condition of the punch cartridge, this unit must be disassembled. Disassembly begins by removing the front rubber boot. It is not attached by anything, just pry it off with a screwdriver.

Next, remove the retaining ring and washer. So the spring is released.

When removing the spring, you need to be careful: there are locking balls under it, they easily slip out and can be lost. After removing the spring, the rear boot can be removed.

The cylinder is secured by four inserts, simultaneously passing through the walls of the perforator barrel. The inserts go flush into the walls, there is nothing to grab them. It is best to use a small magnet or a magnetized screwdriver to remove the inserts. The released cartridge is removed by slightly twisting it from side to side. After conducting an inspection, they make a conclusion: replacement of the entire cartridge or only some parts is required. Assembly is done upside-down.


This design is equipped with light hammer drills designed for drilling holes with a diameter of up to 20 mm in concrete or brick. There are four slots on the nozzle shank. The grooves (4) direct the movement of the nozzle during installation, they come into contact with the wedges (5) of the chuck. this ensures the rotation of the working tool. The grooves (2) are used to fix the shank, they contain the locking balls, not allowing the drills to pop out.

Faced such a problem? What to do?

We have already repaired rock drills and eliminated the defect that does not hold the drill. This malfunction is treated by service engineers at any Umedia service centers. Diagnostics with analysis in the SC is free. The terms of this service are minimal. Has your equipment stopped working? What to do? Bring to any one of 21 Umedia services and we will fix it!

Other cartridges

Besides SDS, there are less common clamping designs. They are designed to hold tools with a smooth shank.

The key chuck for the hammer drill, also known as a gear-girth drill, is similar to a standard drill clamp. The nozzle is fixed in it by three cams, which are moved by the action of a special key. Although the attachment is held securely, the use of this design is limited as tool changes take a long time.

Quick-clamping designs are more convenient in work, save time spent on changing attachments. In a double-sleeve chuck, in order to clamp or release the working tool, you need to hold the back part and rotate the front, that is, both hands are involved. The single sleeve design allows one-handed operation, but requires fixing the working shaft. This option should be incorporated into the design of the rock drill.

Despite the convenience of keyless chucks, the design of the SDS retains the lead.

Typical clamping unit malfunctions

Most often, the following parts are faulty in a hammer drill chuck.

  • The boot is worn or cracked, due to which construction dust penetrating into the cartridge contaminates the lubricant and prevents rotation.
  • Retaining ring. Its weakening releases the spring, the balls fall out of the grooves, the drills do not hold.
  • Guide cylinder. Wear of internal grooves does not allow for a reliable fixation of the drills.
  • Spring. Its wear and tear will reduce amortization.
  • Balloons. Reducing their diameter due to wear does not allow holding the drill.

The balls, spring and retaining ring can be replaced with parts of suitable sizes from other mechanisms, or you can try to make it yourself. The anthers and the guide cylinder are not repaired, they will have to be replaced with branded serviceable copies.

As you can imagine, repairing a hammer drill chuck is not such a difficult process. After the expiration of the warranty period for the tool, in the event of a breakdown, the rotary hammer can be repaired on its own without contacting a service center.