Nothing lasts forever. And the most reliable Bosch rotary hammers begin to break over time. But any malfunction can be repaired with your own hands if you have detailed instructions for performing repair work. Below we offer you a guide to troubleshooting Bosch rotary hammers and a method for eliminating them. The main causes of breakdowns are:
- careless work with the tool;
- improper storage of the hammer drill;
- heavy loads when working on working parts when chiseling or drilling;
- tool overheating;
- long work without a break;
- failure to comply with maintenance schedules.
Conventionally, faults can be divided into mechanical and electrical.
Next, we will consider faults according to their affiliation, dividing them into mechanical and electrical faults.
Goals and objectives of tool lubrication
Often the reason for tool failure is the absence, defect or inappropriate lubrication. Abrasive wear is minimized if all gaps and cavities are covered with a layer of antifreeze, and cleaning is carried out on time.
The type of gear lubricant differs from the composition for the shanks. Each manufacturer advises using a specific hammer drill lubricant, indicated in the instructions, with suitable frequency.
There are general tips that apply to all rotary hammers. Gearboxes must receive a watery mixture of oil, poured into a special hole. For all units, without a doubt, you can use Bosh and Makita lubricant created for gearboxes, which is what they do in service centers.
Incorrectly selected or overfilled lubricant can lead to overheating of the gearbox.
To lubricate the shanks of the working equipment before inserting it into the chuck, a thicker mixture of lubricant from the same manufacturers is used. In this case, the shank fastening element in the cartridge and the firing pin are protected from wear. Filling all gaps with lubricant protects the assembly from dust.
You need to lubricate the places indicated in the instructions. And it is certainly harmful to add lubricant to the clutch. In case of unexpected detection of a lack of lubricant in the gearbox, you can use the Russian composition, Litol-24 Lux, but lubricant is not suitable for battery-powered hammer drills, even temporarily.
Design of the working unit and equipment of the hammer drill
The hammer drill has a chuck into which the working tools are secured. For professional heavy hammer drills, SDS max chucks accept only shanks with a diameter of 18 mm with five longitudinal grooves, which are installed in the chuck socket of the corresponding profile.
The light and medium-sized tool is equipped with an SDS plus chuck, which allows the use of a slotting tool with 4 longitudinal grooves and a cross-section of 10 mm. The hammer drill chuck is designed so that it can only accept tools intended for it. If you insert the wrong equipment, it will not fit into the socket, or it will be installed sideways. If you try to work, the fastening element will be destroyed. But drills do not have a fluted shank. An attached cartridge is used, which is installed in the SDS profile. But with all this, the tool lengthens. The drill chuck for a hammer drill can be a quick-release chuck or a main chuck. The adapter is used only with an SDS chuck, because a more powerful hammer drill does not have the function of drilling without impact.
A hammer drill is a functional tool. It can use modes:
- shock;
- impact with drilling;
- drilling, if there is a special chuck.
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For impact work, there are many devices used to facilitate manual labor.
Drilling impact is performed only with the use of hammer drill attachments:
- Boer;
- hollow crown;
- paddle for scoring.
A drill is a tool that has a special profile shank, a working part that is a screw and a tip made of special steel with a centering tip. The destruction of the material occurs not by scraping, but by chipping the rock. An impact with a turn occurs immediately, as a result of which the chipped pieces are removed along the helical surface of the working part.
Drills for hammer drills are installed when working in non-impact mode. With this equipment, a light hammer drill can work like a regular wood drill. If necessary, the device can be used to tighten fasteners if a reverse function is provided.
A hollow crown is needed to directly make through passages for cable wiring or to create recesses in the body of the structure for installing devices. The crown makes a circular passage, leaving a post in the middle. Because the nozzle has a special toothed profile, iron reinforcement in concrete will render the cutters unusable.
Recesses in the wall can be made with a special spatula for grooves, but the holes will not look as neat as those made with a crown.
Bouchard has long been listed as an architect's inventory. The craftsmen used forging and cross bush hammers. This is a hammer-like percussion instrument with a serrated head. Using a bush hammer, the architect cut off all excess from the stone block, and a cross hammer gave the shape to the stone.
When using the 1st shock mode, use the following attachments:
- spatula or flat chisel;
- peak;
- channel chisel;
- bush hammer
A hammer drill blade is designed to level a surface made of hard material. Using this equipment, you can remove tiles from the walls and remove bulges from the surface of hardened concrete. Correction of certain flaws when installing openings in high-rise construction is carried out using this tool. A hammer drill chisel used for concrete can have different widths, depending on the tasks being performed. Suitable for all rotary hammers. They also use specially made, narrowly targeted attachments - a chisel, a tamping plate or a mortar cutter.
When dismantling building structures, a breaking force is required. To destroy a wall or partition, concentrated at one point, the impact of the lance is provided by the power of the perforator.
Bucharda is an attachment obtained by casting, a very strong sledgehammer. The teeth on the bush hammer are carbide and can withstand enormous shock loads. Removing a layer of concrete from a wall, knocking off a layer of rust from metal - this is the area for introducing bush hammers. If the walls are treated with this equipment before plastering, reinforcement will not be needed. You cannot use a bush hammer for a rotary hammer in the mode of rotating the tool. The inevitable consequence will be jamming.
Selection options
To ensure that the hammer drill lasts a long time and does not break down after six months due to excessive loads, it is recommended to choose equipment taking into account its operational parameters
There are key points to pay attention to
Drill impact force
This is the main parameter of equipment performance. This parameter is measured in joules. What is meant here is not the pressure on the handle, but the features of the device, with what force it will hit concrete or other material. One of the parameters that is responsible for the drilling depth.
- For workers constantly engaged in repairs, it is preferable to choose models with an impact force of 4 to 12 J.
- For periodic use, a hammer drill with an indicator of 1-2 J is suitable.
- And for frequent work with concrete surfaces, equipment with an impact force of 27 J is required.
Impact frequency
Impact frequency is the second important operating parameter of a rotary hammer. If the push force is large and the impact frequency is low, then the work will proceed slowly.
- For professional use of equipment, parameters of 5-6 thousand beats per minute are suitable.
- If you plan to use a hammer drill at the household level, you can buy a tool with 3-4 thousand beats per minute.
Rotation speed and power
The drilling depth is affected by the force and frequency of the impact. And the power and rotation speed of the chuck with a drill is an important parameter on which the speed of processing thick surfaces depends. A powerful motor is required for fast speed.
- If it is necessary to work with thick walls and partitions, the power of the hammer drill should range from 700 to 1200 W (rotation speed within 2500 rpm).
- If you plan to work with thin partitions (up to 4 cm), a motor power of 500 W and a rotation speed of up to 1200 rpm is sufficient.
When choosing power parameters, you should pay attention to the diameter of the drill. A high rotation speed is justified if a thin drill is used in the work
A thick drill at high speeds will wear out quickly
A thick drill at high speeds will wear out quickly.
Operating modes
Each rotary hammer model has several operating modes. This is a feature of the tool. If the model operates in two modes - rotation and rotation with impact. Three-mode modifications can only work on impact.
The cost of a hammer drill directly depends on the number of modes. If the craftsman has a variety of activities (drilling through holes, installing fasteners), it is worth purchasing a three-mode tool. For the same type of work, you can purchase a dual-mode hammer drill.
Case shape and weight
Equipment of this type is used in work under different conditions, so the productivity and fatigue rate of the worker depend on the shape and weight of the housing. Lighter models have a horizontal engine. They are the best option for installing a suspended ceiling.
Rotary hammers with a vertical engine are heavier, but their body is more compact. They are more productive for drilling walls. The heaviest T-shaped models of rotary hammers were developed for work with road surfaces.
The hammer drill is slipping
The reason for this is a weakened coupling. It is enough to tighten it or change it.
How to repair a hammer drill if it doesn't work. We find out the reasons for tool failures
The construction industry is developing and adding new tools every day. Over the course of several years, the hammer drill has been among the top power tools. In fact, this is an ordinary drill, which is armed with an impact effect. Once a day, the second employee faces shortcomings.
Possible malfunctions, causes of their occurrence and solutions
To repair a rotary hammer with your own hands, you should first look for external manifestations of defects.
How to remove and change brushes
The commutator carbon brushes are replaced with an electrical screwdriver. If you unscrew the cover, you will have access to the brushes. Each part is removed one by one from the brush holder slots. Some models differ in the design of the pressing mechanism; usually it is a spiral spring, which must be removed during replacement.
Attention! Before replacing brushes, the hammer drill must be disconnected from the power supply.
READ How to Fix a Drill in a Rotary Hammer
The hammer drill does not hit
If the hammer drill has stopped hammering when switching to impact mode, but the drill is still spinning, it is more likely that the floating bearing is damaged. The solution to the problem will be to replace it with a new one.
The second probable reason is a malfunction of the impact mechanism. Often, when overloaded during work, the metal striker splits, this first leads to a weakening of the impact, and then to its complete absence. The firing pin needs to be changed.
The third possible reason is wear or breakdown of the piston group of the hammer drill. The liner and piston should be replaced.
Disassembling the impact mechanism block of the Interskol P26 / 800ER punch
The main differences are in the design of the impact mechanism.
The impact mechanism consists of several components:
- Impact mechanism barrel;
- counter shaft;
- Strikers and percussionists;
- Cylinder liner;
- Sleeve bearing
The impact mechanism of Interskol rotary hammers works on the same principle. Differences in design features.
Disassembling the impact mechanism of the Interskol P-26 / 800ER rotary hammer
In the Interskol P-26 / 800ER rotary hammer, the impact mechanism consists of the following components:
- Tool receiver;
- Trunk mounting block;
- Stem;
- counter shaft;
- Strikers, percussionists, industrial masses.
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Disassembling the instrument receiver
Tool receiver pos. 12 is dismantled after removing parts without a key.
In the first stage there are four video poses. 11 has been carefully removed. Then the receiver is removed from the housing pos. 18. The method according to claim 18, in which the needle bearing pos. 20 inserted.
Bochka village 36 is mounted in a needle bearing.
Remove the tool receiver from the barrel.
The industrial weight of pos. is removed from the instrument receiver. 16, sleeve pos. 15, sleeve pos. 14 and rubber sealing ring pos. 13.
Disassembling the barrel of the percussion mechanism
Bochka village 36 removed from the inner body pos. 18 after the gearbox housing is separated from the stator housing. To do this, unscrew the four screws pos. 30 from the gearbox housing.
Then unscrew the three screws pos. 85 on the handle pos. 86. Having removed the handle, turn the brush holder body pos. 81. Until he can be removed from the case.
The gear housing and stator housing are now easily separated by using a screwdriver to push one towards the connection point.
The barrel can be easily removed from the industrial site, position 53 (inner body).
The outer diameter of the barrel is equipped with: toothed pin pos. 35, spring village 33, washer pos. 32 and latch pos. 31.
In the barrel cavity there is a trap body pos. 40, striker 45.
Showdown of striking hunters
Disassembling the catcher pos. 40 consists of separating from it the shock absorber pos. 41, the impact retainer pos. 42, the trap cover pos. 43 and the retaining ring pos. 44.
Piston pos. 45 is inserted into the piston pos. 45, which should be removed.
With the attacker of the village. 45, ring pos. 46 removed.
From the ears of the piston village. 47 it is necessary to separate pos. 48 and remove the two rings pos. 49.
Disassembling the counter shaft
Disassemble the intermediate shaft pos. 57, it must be removed from the inner housing. From the village shaft 58 remove the switch arm pos. 55, spring village 56.
On the other side: remove the support sleeve pos. 65, spring support pos. 64, spring pos. 63, combined transmission pos. 62.
Intermediate shaft of the Interskol P-26 / 800ER rotary hammer Catalog of spare parts for the intermediate shaft of the Interskol P-26 / 800ER rotary hammer
Procedure for disassembling and assembling the device
You should begin disassembling without the help of others only if you have the appropriate tools and equipment. To repair a rotary hammer with your own hands, you will need:
- screwdrivers with various slots;
- vice;
- wrenches and socket (hexagonal) keys;
- bearing pullers.
In addition, spare parts for replacement, rubber seals and gaskets will be needed. To lubricate the gears of the devices, the following will be useful:
- grease;
- rags;
- cleaning solvent.
In case of self-repair of the electric motor, in addition to the multimeter, you will need:
- spare carbon (or graphite) brushes;
- copper wire of the required cross-section;
- template for rewinding reels.
How to replace the cartridge
The cartridge can almost always be repaired. If the wear of individual parts has exceeded the permissible limits or the rubber boot and plastic skirt are damaged, it is more advisable to replace the cartridge completely.
The procedure for replacing the cartridge is clear from the procedure for disassembling the hammer drill described just above.
Removing the mode switch
To remove the operating mode switch, you must:
- Move the toggle switch to the “blow” position (pictogram with a hammer) and turn it about 1 cm lower.
- Release the lever from its socket.
- Pull the lever towards you.
The hammer drill does not hold the chuck
Sometimes there is a situation when the cartridge flies off along with the equipment while the hammer drill is running. This occurs due to wear of the chuck body mount at the end of the raster sleeve, which is a retaining ring. If it breaks, the fixation is broken and during the push the rubber boot flies off, followed by the spring and balls.
You can restore normal operation of the cartridge by installing a new locking ring. This is done quickly and does not require any additional equipment other than a regular screwdriver.
Rotating the gear on the barrel
The loss of drilling during a working impact manifests itself when the gear position 35 is turned on the shaft of the barrel, pos. 36.
The gear is fixed on the barrel with three rollers, pos. 37. And in order to hold it securely, the gear is pressed by a spring, pos. 33, which is secured through the washer, pos. 32, with a retaining ring, pos. 31.
The malfunction occurs due to the weakening of the force of the pressing spring, the rollers falling out, and the destruction of the cam bushing pos. 38.
repair of the Interskol P-26/800ER rotary hammer consists of restoring all parts to the required position or replacing failed ones.
Replacing the main components of a rotary hammer
It is best to replace key elements before the part becomes unusable. This will protect the instrument from more severe damage, which would be more expensive and time-consuming to correct. The most common replacements are:
The hammer drill does not spin and does not drill
If the chuck does not rotate when you press the start button in drilling mode, the cause can first be determined by the sound. If the electric motor hums but does not turn the chuck, most likely something is preventing the rotor from rotating inside the gearbox. What happened to the engine will have to be found out by disassembling the mechanical part of the tool.
If the engine does not hum when turned on, it is more likely that the motor has failed. Having opened the lid of the device, it is necessary to determine what exactly led to this phenomenon. This could be an open circuit, a broken start button, or a short circuit in the coil windings. Using the tester, the specific cause is determined and appropriate repairs are made.
The hammer drill is cracking and won’t turn, how can I fix it? Don't forget to read the description of the video!
Preventive measures
It is better to prevent breakdown, so it is better to follow the following tips.
- Change the lubricant a couple of times during the year.
- Every six months, preventive inspection of brushes.
- Thorough cleaning every time after work.
- Before the start of the working day, lubricate the back of the drill or chisel to reduce the load on the striker.
If the hammer drill does not work normally, or in other words, a breakdown has occurred, read the instructions and carefully inspect it. Before you start renovating your home, take a realistic look at your abilities. If you are convinced, try to fix it at home, otherwise, if in doubt, it is better to contact a specialist. Do not forget that already repaired mechanisms are not intended to be covered under warranty and service centers are reluctant to accept them for repairs.
Source
The hammer drill cracks under load
The hammer drill rotates and crackles. I worked my five years normally, faithfully. How can I fix this problem myself?
Oleg, often when overloaded in work, the steel striker splits, this leads first to a weakening of the blow, and then to its complete absence. The firing pin needs to be replaced.
The second probable reason is wear or breakage of the piston group of the hammer drill. The liner and piston should be replaced. If you have experience, you can do it yourself.
READ Why The Trimmer's Coil Doesn't Spin
A properly working hammer drill is an excellent assistant in the household and in production. This versatile tool with many functions allows you to comfortably solve even the most complex tasks. If a hammer drill breaks down, it is not at all necessary to immediately take it in for repairs. A home craftsman can disassemble and repair this tool himself. How to repair a rotary hammer with your own hands?
Design
The difference between a regular drill and a hammer drill is that a hammer drill has a strong impact function, which helps you work with tougher materials. The power of the tool's push allows the master to waste less physical strength. One of the reliable assistants in the household, solving household and repair problems is the representative of Makita electrical equipment.
READ Hours of Operation with a Rotary Hammer in a Residential Building
The Makita device consists of motorized and electrical parts. Its body is divided into two colors: black and green. Under the black part there is a mechanical unit, and under the green part there is an electrical installation unit.
The mechanical half is responsible for the following functions:
- shaft torque supply;
- torque;
- shock push;
- transmission of torsion from the rotor to the tool itself.
Makita power tools are the most powerful construction equipment for heavy, intensive loads, with three functions: drilling, crushing, impact drilling. The device has anti-vibration, which is not typical for every instrument. The assembly includes an individual dust protection system.
Specifications:
- weight – 2.04 kg;
- The SDS system makes it possible to attach drills;
- beats 4500 times per minute;
- movement power – 2.7 J;
- power supply from the network – 780 W.
How the start button changes
To replace the start button, you need to remove the cover covering the electrical equipment of the hammer drill. Then you should disconnect the contacts of the conductors connected to it and pull the button body out of the seat. Install a new button in this place, connect the contacts and assemble everything in reverse order.
Removing the cartridge
Disassembling the hammer drill begins with removing the cartridge. As a rule, this is an SDS-plus system cartridge, which is disassembled using a flat-head screwdriver. In this case, there should be no drill or chisel in the chuck.
There are times when the drill gets jammed and it is not so easy to get it out. Then you need to carefully tap the cartridge around the circumference using a rubber hammer and pour a few drops of lubricant like WD-40 inside. After a few minutes, try again, the drill should come out easily. After this, you can begin to disassemble the cartridge itself. Procedure:
- Pull the plastic skirt down.
- Use a screwdriver to remove the rubber protective boot.
- Unclench and remove the retaining ring located behind the boot.
- Remove the plastic boot, spring, locking plates and balls.
- Clean all parts from old grease and store them in a clean place.
Daily care and storage of a rotary hammer
In order for the tool to serve for a long time and properly, you need to follow simple rules.
- Before starting work, conduct a quick inspection of the technical condition of the tool. Under no circumstances should you ignore signs of malfunction if any are discovered.
- At the end of work, clean the rotary hammer from dust and debris. It is advisable to blow with a stream of air from a vacuum cleaner.
- When transporting in the cold season, before starting work, give the device at least 20 minutes to “acclimatize” the device. The grease should thaw and become elastic.
- Work in compliance with the operating standards described in the technical data sheet of the tool.
The hammer drill cracks and does not spin \ The safety clutch at 2470 has failed \ It slips
The hammer drill stored in a dry and warm place. For long-term preservation, it is recommended to pack in a plastic bag and cardboard box. Do not allow moisture to come into contact with electrical parts, including condensation from the air.
Aware means armed. Knowing the intricacies of the hammer drill mechanism, you can repair the tool yourself and in the shortest possible time. However, if you look under the casing of the hammer drill in a timely manner, clean and lubricate the mechanisms, then it is quite possible that you will not have to resort to repairs at all. Regular maintenance of the device will help extend its service life.
How to repair a hammer drill if it doesn't work. We find out the reasons for tool failures
The construction industry is developing and adding new tools every day. Over the course of a couple of years, a rotary hammer . In fact, this is an ordinary drill that is armed with an impact effect. Once a day, the second employee encounters defects.
How to change bearings
If, during a routine inspection, grease leaks are noticeable on the bearing, it crackles or crunches when turned by hand, this means that it is time to replace it. The bearing is dismantled using a special puller consisting of a screw part and a device for gripping the bearing sleeve housing. Tightening the thread creates a force that removes the bearing from the shaft.
Installation of a new bearing on the workplace is carried out with a rubber or wooden hammer. During installation, it is important to prevent misalignment of the bearing axis relative to the shaft axis. Lubricant is applied to the part after installation.
The drill does not stay in the chuck and flies out
Incontinence of the hammer drill equipment can occur during long-term use. The drill or chisel inserted into the chuck does not hold and flies out during operation. It is not only impossible to continue chiseling with such a tool, it is also very dangerous - a flying chisel can cause injury.
The reason for equipment incontinence lies in wear or breakage of the cartridge. The cartridge needs to be disassembled and determined what the problem is. Perhaps the balls have become deformed, wear has appeared on the restrictor ring, or the retaining spring has sagged. Usually, after replacing the damaged part, the cartridge begins to function normally again.
Oil selection
Russian manufacturers have developed special lubricants for lubrication of rotating hammers. The lubricant is divided in accordance with the operating conditions of the units. It is recommended to use lubricants designed specifically for these units to lubricate the transmission, rolling bearings and clutch.
Typically, lubricants are divided into three categories:
- For particularly stressed components such as impact mechanism, gearbox, gear shaft.
- For lubricating drill shanks.
- For lubricating rubber seals.
It is advisable to use Tsiatim-221 as lubricating rubber rings, which does not destroy rubber.
READ Why The Hammer Doesn't Chisel But Only Drills
Special gear oils are used for Interskol gear hammer drills.
Russian oil for rotary hammers
Before installing rubber seals on parts, they should always be lubricated with an inert lubricant that can withstand temperatures up to 120 ºC.
It is recommended to use not only fatty inert rubber, but also one that provides maximum compaction during operation. Among Russian lubricants, look at Tsiatim-221.
Russian oil for seals in hammer drills
For reliable grip of the tool and its easy pulling at the end of work, it is recommended to use a special bundle for the shafts.
Russian oil for drilling rigs
How to fix a hammer drill yourself
The repair procedure yourself is optimal and will cost less than the services of service centers. Repairing an instrument is not cheap; it is not a fact that you will find an honest repairman. Before you think about how to make a hammer drill, you should acquire the necessary tools, stock up on theoretical knowledge, how to disassemble and assemble a hammer drill . Once the repair is complete, run it in gentle mode.
Sources:
https://tehznatok.com/remont/kak-otremontirovat-perforator-svoimi-rukami.html https://schemy.ru/info/perforator-treshhit-pri-nagruzke/
