How to disassemble the gearbox of a Bosch rotary hammer. Dismantle with a threaded coupling
Features of the design of Bosch 2-20, 2-24, 2-26 household peorators
Just imagine that your tool suddenly stopped working or you urgently need to replace some faulty part. The simple way is to take the torch to the service center for repair, but it takes time, which means that for some time to stop your work. If you know how to disassemble the device, it will be much easier to perform the rest of the work. Already today, it will lead to significant savings, because you do not need to spend money to pay for the services of repair centers.
- Let’s start the works, starting with the development of the upper unit: first remove the rubber nipple, then the washer, the spring, and finally the ball.
- If you have removed the ball, unscrew the screws that hold the housing, remove the handle plate, if available, not at the end of the process disconnect the wires of the stator.
- Remove the brush holder.
- The next step is to separate the gearbox from the housing until a gap is formed. It is through it we meet to remove the switch.
- Later, the body of the peorator is placed vertically, fixed using a vice, and its parts are carefully removed from the device.
The device of the Bosch
The electrical and mechanical parts are the main components of this tool.
- motor control device (sometimes combined with a switch);
- The on/off switch
- elements that dampen interference;
- power cord.
This tool may come with various add-ons in the form of a drill, bits, vacuum cleaner, and other parts.
Replace the main parts of the torque arm
Replacing key elements is best done before the part becomes unusable. This prevents heavier damage to the tool, which is more expensive and time-consuming to repair. It is most common to have to do the replacement:
How to change bearings
If a bearing shows grease leaks, cracks, or crunches when you rotate it by hand during a routine inspection, it is time to replace it. The bearing is disassembled with a special puller consisting of a screw part and a device for gripping the bearing housing. Tightening the threads creates a force that pulls the bearing off the shaft.
The puller is actuated by turning the threaded rod
The new bearing is placed in its seat by hitting it with a rubber or wooden mallet. When installing it is important not to allow the bearing axis to misalign with the shaft axis. Lubricant is applied to the part after installation.
How to change the starter button
To change the starter button you must remove the starter motor electrical box cover. Then disconnect the contacts of the conductors connected to it and pull the body of the button out of the seat. Install a new button in this place, connect the contacts and assemble everything in the reverse order.
A button turns on the motor and adjusts its speed
How to remove and replace the brushes
Use an electric screwdriver to replace the carbon brushes on the manifold. If you unscrew the cover, you will have access to the brushes. Remove each part in turn from the brush holder sockets. Some models differ in the design of the clamping mechanism, usually it is a spiral spring, which must be removed at the time of replacement.
Warning! The unit must be unplugged from the mains before replacing the brushes.
Bend the coil spring to remove the brushes
How to replace the brush holder
In most cases the chuck can be repaired. If individual parts are worn beyond allowable limits or if the rubber dust cap and the plastic skirt are damaged, it is more practical to change the whole chuck.
Use a screwdriver to change the extractor cartridge
The procedure for replacing the cartridge is clear from the disassembly procedure of the torch described above.
Unusual malfunction of the Bosch torch
Bosch chucks are very reliable. But there are problems that are almost never seen in practice. Here is one of them.
Bosch drill but not chisel
If the torch has stopped chiseling, but still allows drilling, the most likely cause could be the collapse of the “drunken bearing”. This defect is not very common and can be difficult to find.
You do not need to go to a repair shop to fix it. Any person with little or no knowledge of mechanics can repair the defect.
A new, drunken bearing
First disassemble the Bosch bearing down to the intermediate shaft. Please see above for disassembly procedure.
If you remove the intermediate shaft you will get to the “drunk bearing”. A damaged roller bearing is indicated by a broken cage, scattered balls, and pieces of the cage.
Take out the bearing, remove dirt, all parts of the ruined mechanism.
Buy a new “drunken bearing”, and, having lubricated all the parts with new grease, replace and reassemble them in the reverse order of the disassembly steps.
How to repair any Bosch motor with your own hands, knowing the design
A peorator is a construction tool used for chiseling and drilling. Thanks to a special mechanism, the torch punches holes in different materials very efficiently and quickly. It can be used in work with concrete, brick, metal, wood, stone. Bosch brand rotators are very common among builders and ordinary people, so it is very important to know how to repair these devices in case of breakage.
It is important to pay attention to the original models! There is a fake Bosch Hammer Drill 32 peorator. Beware of fakes!
The rules of operation or how to protect the device from breakage
To ensure the long and efficient operation of the electric peorator, it is enough to follow a few simple rules. In particular:
- It is not advisable to apply too much pressure, because it is not even necessary and, what is more, if you apply too much pressure, the tool breaks down more quickly.
- It is inadmissible to work the electric torch in idle mode.
- When working with porous materials it makes sense to cut off the hammer mechanism. When working with especially hard materials it is advisable to use grease.
- When working for long periods of time, the housing temperature must be monitored, especially in the area where the gear unit is installed. In case of noticeable heating you should stop working and wait until it cools down. Do not use water for cooling. Water can damage parts of the gearbox.
- the tool should be operated in the following mode. at least 10 minutes of rest after half an hour of work.
How to Disassemble the Bosch Gbh 2 24 Peorator
Instructions for disassembling the Bosch torch
the working principle of the Bosch 2-26 is no different from that of the other brands.
Rotating rotor transmits torque to the intermediate shaft of the mechanical unit, immediately transferring translational motion through the roller bearing to the striker mechanism.
Rotating torque with a progressive shock pulse is transmitted to the working tool. This principle is implemented in all rotators.
Different companies that make the torches have their own design features.
Bosch rotary tools are the best in their class in the power tool sector. But nothing is infinite.
If your peorator Bosch 2-20, 2-24, 2-26 did not work, then it has an option to return without assistance from others. It is necessary to have simple abilities of the mechanic not to have a little knowledge of electrical engineering. Not another important detail, the design of the Bosch torches is so common that it does not cause difficulties when performing repairs.
When carrying out repairs to power tools, including repair of Bosch torches, strictly observe safety while working with electrical appliances.
To facilitate repair of the Bosch peorator, its disassembly and reassembly, study the scheme of assembling the tool:
All disassembly of a Bosch torch 2-26 begin after examination, a test run and identification of the circumstances of the malfunction device.
Disassembling a Bosch 2-26
Bosch UBH 2/20 RLE. autopsy/teardown
How. To disassemble and assemble the Bosch 2-26 Peorator _at home_ with your own hands
How to disassemble and assemble the peorator Bosch 2-26 at home by your own hands. Disassembling motor, gearbox
Rock the switch handle to remove the switch handle from the body.
Disassembling the intermediate shaft
The intermediate shaft is disassembled by removing the shaft pos.24 without pulling it out of the housing pos.77 “drunken bearing”.
Bearings can be removed with pullers or manually with a tool.
Disassembling of the electric part of the Bosch 2-26
Disassembly of the Bosch 2-26 accelerator, its electronic part begins with removing the back cover on the accelerator handle by removing the three screws.
Then you need to take out the reversing switch.
Demolition Hammer Refreshment | Bosch GSH 5 E Professional; 12 J; SDS max
Turn it into neutral, do not lift it up on your own. Pull out the reversing switch.
To remove the stator cover, you need to clasp the mechanical unit in the right hand and the stator housing in the left hand, drag them in different directions, rocking.
Separating the striker unit from the rotor
To separate the rotor from the mechanical unit it is enough to drag these parts in different directions. The rotor is fixed in the mechanical unit by a small helical gear inserted in contact with a large helical gear of the mechanical unit.
The rotor released you can not look closely at the condition of the manifold, bearings.
To remove the stator it is sufficient to remove the plastic protective sleeve, not to knock with a wooden spindle or other words with a mallet on the face of the housing in which the stator is installed. Before that it is still necessary to unscrew two screws fixing the stator in the case.
The stator is removed, the rotor is taken out, naturally proceed to their inspection without defecting all the parts that are part of the electronic part of the Bosch perorator.
At examination of disassembled Bosch 2-26 burner give particular attention to condition of carbon brushes, deposits on brush holders, integrity of reversing switch contacts, condition of wire at the entrance in the burner.
The length of the brushes must be at least 8 mm. On brush holders it is not necessary to make traces of arcing or carbon dust from brushes, on the contacts of the reversing switch of Bosch 2-26 there is no burnout or otherwise the contacts are damaged.
How to repair any Bosch with your own hands, knowing the design features
The most widespread among professional builders in Russia are Bosch torches, and among amateurs are household models Bosch 2-20, 2-24, 2-26.
Not only do the torches work well, but they are easy to repair. any broken part can easily be found on them.
In the constructions of the described torches the same principle is laid down, to transmit the torque from the rotor to the shaft of the striker unit with the simultaneous transmission of the progressive impulse to the working tool.
Structurally the torches are designed in a similar way, but individual assemblies or parts have their own particularities.
If you know the specific differences between the models of the described Bosch burners, they can be easily disassembled and repaired by your own hands.
Alongside with originals on Russian market there is a great number of imitations of tools, including Bosch torches.
Described below are the constructional features of the models and the methods of their disassembly and repair by your own hands.
Principle of their operation is the same, but their constructional peculiarities are different.
The main parts used in the listed models of the Bosch perforators are interchangeable. This applies to mechanical and electrical assembly.
But there are assemblies and dozens of different parts used.
To repair a Bosch 2-20, 2-24, 2-26, you need to know about these differences. Knowing the design features of each peorator makes it easier to repair, find and repair the defects.
The design of the Bosch torches are so simple that you can perform simple repairs, practically with your own hands and replace any part without recourse to the service. You have to be a skilled assembler, have elementary knowledge of electrical engineering and understand the principle of work.
The main differences in the design of Bosch perforators
Repairing the Bosch peorator, you can not do without the electrical and disassembly diagrams of the model you are going to repair.
The schematic diagrams of the Bosch 2-20, 2-24, 2-26 torches are practically identical. Although there are some non-principled differences.
And the mechanical units are completed with the parts that differ from each other structurally. The main differences are in two units: the intermediate shaft and the shaft of the striker unit.
The biggest differences are in the design of the intermediate shaft, the “drunken bearing” assembly, the mode switch. Unprincipled features are present in the structures of the firing pin, firing pin, and striker.
Diagram and construction of Bosch 2-20
it is not possible to repair the Bosch 2-20 without knowing the construction of the tool to be repaired.
The principle of operation of the Bosch 2-20 is based on torque transfer from the rotor shaft pos.3 to the shaft of the impact unit pos.22 via the intermediate shaft pos.824, simultaneously transmitting a longitudinal impulse to the working tool.
Rotor pos.3 transmits the torque to the helical gear of the intermediate shaft pos.824.
Helical gear is mounted on the intermediate shaft and transmits the torque to the shaft. The shaft is fitted with a drunken bearing which receives its torque through the clutch. Drunken bearing design transmits translational motion to the percussion head cylinder.
Intermediate shaft design of the Bosch 2-20
The Bosch 2-20 accelerator intermediate shaft consists of a roller bearing assembly (booze bearing), clutch, large helical gear, small spur gear.
The most frequent failures occur in the wear of the clutch slots, which leads to the loss of rotation of the torch chuck in the presence of a shock pulse.
830 Corrects by replacing the clutch or repairing the teeth on the clutch components.
View of the intermediate shaft of the Bosch 2-20
Design features of the Bosch 2-24 accelerator
It is best to begin your Bosch 2-24 repair procedure by familiarizing yourself with the diagram and construction details of the tool you are setting up. The principle of operation of the Bosch 2-24 is similar to that of the Bosch 2-20.
Torque is transmitted to the tool mount shaft, simultaneously with the transfer of the shock pulse. There are three operating modes of the rotary table: drilling with impact, drilling without impact, impact.
Helical rotor pinion pos.The 803 transmits torque to the helical gear of the intermediate shaft pos.826.
Design of the Bosch 2-24 intermediate shaft
The intermediate shaft of the Bosch 2-24 is made up of a roller bearing unit pos.830, clutch pos.823, shift parts pos.44. Most often the clutch fails. It has teeth that wear out. Repair of the coupling consists of correcting the tooth profile in the coupling and on the intermediate shaft.
Intermediate shaft assembly Bosch 2-24
Shaft design of the striker shaft
The shaft of the firing pin assembly is designed to transmit the rotary impulse with simultaneous movement of the firing pin.
Rotation is transmitted from the spur gear of the intermediate shaft to the large spur gear pos.22 barrel shaft pos.821.
Reciprocating motion is transmitted by means of a feather bearing pos.830, striker piston pos.26, striker pos.27, firing pin pos.28 on the chuck pos.756 bore.
The design is a hollow shaft on one side. Both sides of the shaft are fitted with parts.
On the side of the chuck mount a spur gear pos.22 and is secured on the shaft by means of a roller pos.88, is pressed against the shaft shoulder by a spring pos.80. The spring itself is secured by the retaining ring pos.85.
Into the cavity of the shaft of the striker unit insert: assembled striker bolt pos.28 and striker piston. In the striking piston pos.26 the pin is inserted pos.27 with a new rubber ring put on it pos.73. All rubber parts are lubricated with the recommended grease.
Failure of the striker shaft
The pinion can turn on the shaft because of the weakening of the spring force, loss of fixing roller. This is indicated by the loss of torque and the presence of a percussion pulse.
How to disassemble and repair a Bosch torch with your own hands
The principle of operation of the Bosch 2-26 is no different from that of other famous brands.
The rotating rotor transmits torque to the intermediate shaft of the mechanical unit and simultaneously transmits translational motion through the roller bearing to the striking mechanism of the singer and the impact pulse.
The torque is transmitted to the working tool with a progressive shock pulse. This principle is implemented in all torches.
But the various brands that make them have their own design features.
Bosch torches are considered the best in their segment of power tools. But nothing lasts forever.
If your Bosch 2-20, 2-24, 2-26 has stopped working, you can repair it with your own hands. You should have a basic locksmith’s skill and a little knowledge of electrical engineering.And another important detail, the design of the Bosch torches is so simple that it is not difficult to repair.
When repairing power tools, including Bosch torch repair, be sure to follow safe working practices when working with power tools.
To make it easier to repair, disassemble and reassemble your Bosch torch, study the tool’s assembly diagram:
Any disassembly of the Bosch 2-26 torch begins after you have inspected it, tried it out and found the cause of the malfunction.
disassembly of the Bosch 2-26 torch chuck
Disassembling the Bosch 2-26 torch
Since the order of disassembly of the Bosch 2-20; 2-24; and 2-26 is practically the same, let’s examine the disassembly order on the example of the Bosch 2-26.
The disassembly of the Bosch GBH 2-26 dre starts with the disassembly of the quick-release chuck.
Disassembly of the quick-release chuck
There are two types of chucks most commonly used in Bosch rotary hammers: SDS-plus and SDS-max chucks. The difference between them is the principle of clamping the tail part of the working organ.
The Bosch chuck design differs depending on the SDS-plus or SDS-max model in the design of the tool shank. In addition to the types of chucks listed above, there are SDS-top, SDS-quick chucks.
The difference between the cartridges fastening assemblies
The procedure for disassembling a Bosch 2-26 chuck is simple:
- Remove the rubber tip pos.34;
- Remove retaining ring pos.87;
- Remove the steel washer pos.833;
- Take out the conical spring pos.833;
- carefully, so as not to lose them, use a magnet to take out the barrel balls pos.89.
Carefully inspect all chuck components.
SDS-plus quick-action chuck demounted
SDS-plus chucks developed specifically for drilling tools. tool shank diameter 10 mm, working tool length between 110 mm and 1000 mm. Drill bit diameter range 426 mm.
How to remove the mode switch
With the tool on its side, remove the mode switch pos.832.
First turn the switch to the “Drill” position, press the screwdriver all the way to the face of the switch (it is red) and turn the switch counterclockwise at an angle of 70º.
Wiggle the rotary switch handle and pull the rotary switch handle out of the housing.
Disassemble the striker assembly
With the Bosch Peorator 2-26 upright on the handle, unscrew the four screws pos.90 holding the cover of the mechanical unit body.
Press on the end of the striker shaft and remove the cover. Black plastic cover.
Now you have to remove the barrel pos.821 and intermediate shaft pos.826. They are not secured in any way.
Then using a screwdriver remove the bracket pos.48 rolling bearing pos.830. By the way, it’s called a “drunken bearing” in simple terms. Remove one after the other: sleeve, pos.26 and the “drunken bearing”.
Disassembly of percussion mechanism barrel assembly
Shockwheel assembly, intermediate shaft and drunken bearing
Disassembly of the cylinder
Inside the cylinder there is a striker pos.27, from which you have to remove the rubber ring pos.73. Whenever disassembly is carried out, the rubber parts must be replaced.
At the opposite end of the cylinder there is a hinge pos.29 and two flat washers pos.41.
Disassembly of the intermediate shaft
Intermediate shaft is disassembled by removing the shaft pos.24 and pulling out of the housing pos.77 “Drunken bearing”.
Bearings are removed with pullers or by hand, using a device.
Unusual malfunction of a Bosch torch
Bosch torches are very reliable. But there are failures, which are almost never met in practice. Here is one of them.
The Bosch peorator drills but does not bore
If the drum has stopped hammering but lets you drill, the most probable cause is a “drunken bearing” failure. It is not a very common problem and can be difficult to find.
No need to go to a repair shop to fix it. Any mechanically skilled person will be able to fix it.
First you need to disassemble the Bosch Peorator as far as the intermediate shaft. For disassembly see above.
By removing the intermediate shaft, you get to the “drunk bearing”. A damaged roller bearing is indicated by a broken cage, scattered balls, pieces of the cage.
Take out the bearing, remove dirt, all parts of the broken mechanism.
Buy a new “drunken bearing”, and, having lubricated all parts with new grease, replace and reassemble, in the reverse order of the disassembly steps.
Disassembling the electrical part of the Bosch 2-26
Disassembly of the Bosch 2-26 stator, its electrical part, begins with removing the back cover on the handle of the stator by removing the three screws.
The next step is to remove the reversing switch.
Turn it to the neutral position and lift it toward you. Reverse switch out.
To remove the stator cover, you must clasp the mechanical unit in your right hand and the stator housing in your left hand and drag them in different directions while rocking.
Separating the drum unit with rotor and stator