Disassembling the Bosch 2 Hammer 24 Videos
The most widespread among professional builders of Russia were Bosch punchers, and among amateurs, household models Bosch 2–20, 2–24, 2–26.
Hammers not only work well, but are also easily repaired. On them you can easily find any failed part.
The designs of the described punchers have the same principle, to transmit torque from the rotor to the shaft of the barrel of the shock unit while transmitting the translational pulse to the working tool.
Structurally, perforators are made in the same way, but individual components or parts have their own characteristics.
If you know the specific differences between the models of the described Bosch rotary hammers, then disassembling and repairing with your own hands will not be difficult.
Along with the originals, the Russian market has a large number of counterfeit tools, including Bosch rotary hammers.
The design features of the models and how to disassemble and repair them yourself are described below.
Bosch rotary hammer working principle
The principle of operation of perforators is the same, but the design features differ.
The main parts used in the listed Bosch rock drill models are interchangeable. This applies to the mechanical and electrical components.
But there are nodes and did, differing in the details used.
To repair a Bosch 2–20, 2–24, 2–26 punch, you need to know these differences. Knowledge of the design features of each perforator facilitates the repair process, finding breakdowns and eliminating them.
The designs of Bosch rotary hammers are so simple that they allow you to carry out simple repairs with your own hands and replace any part without contacting customer service. You must have the skills of an assembler, have basic knowledge of electrical engineering and understand the principle of the punch.
Key Design Differences with Bosch Rotary Hammers
When repairing a Bosch rotary hammer, you will not be able to do without the electrical and disassembling tools for the model you are about to repair.
The electrical circuits of Bosch 2–20, 2–24, 2–26 punchers are almost identical. Although some unprincipled differences exist.
But the mechanical blocks are equipped with parts that differ structurally from each other. The main differences are collected in two nodes: in the intermediate shaft and the shaft of the shaft of the shock block.
The greatest differences are presented in the designs of the intermediate shaft, the assembly of the “drunken bearing”, in the mode switch. Unprincipled features are present in the structures of the barrel of the shock block, striker, striker.
Let’s start with the Bosch 2–20 punch.
Diagram and designs of the Bosch 2-20 hammer drill
Repairing a Bosch 2–20 rotary hammer will not be possible without knowledge of the design of the repaired tool.
The principle of operation of the Bosch 2–20 rotary hammer is based on the transmission of torque from the rotor shaft pos. 3 to the shaft of the shock block pos. 22 through the intermediate shaft pos. 824, while transmitting a longitudinal impulse to the working tool.
The rotor pos. 3 transmits torque to the helical gear of the intermediate shaft pos. 824.
Bosch 2-20 rotary hammer diagram
The helical gear is fixed on the intermediate shaft and transmits the torque to the shaft. A drunk bearing is mounted on the shaft, which receives a torque through the clutch. Due to its design, the drunk bearing transfers translational motion to the barrel barrel of the percussion mechanism.
The design of the intermediate shaft of the Bosch 2–20 hammer drill
The intermediate shaft of the Bosch 2–20 hammer drill consists of a rolling bearing assembly (drunk bearing), a clutch, a large helical gear, and a small spur gear.
Most often, breakdowns are manifested in the wear of the splines of the clutch, which leads to the loss of rotation of the perforator cartridge in the presence of a shock pulse.
Corrected by replacing the clutch or restoring the teeth of the clutch parts.
View of the intermediate shaft of the Bosch 2-20 hammer drill
Design Features of the Bosch 2–24 Hammer
Repairing a Bosch 2–24 rotary hammer is best started with an introduction to the design and design features of the tool being adjusted. The principle of operation of the Bosch 2–24 rotary hammer is similar to the principle of operation of the Bosch 2–20 rotary hammer.
Torque is transmitted to the tool mounting shaft, simultaneously with the transmission of the shock pulse. The puncher has three operating modes: drilling with impact, drilling without impact, impact.
The helical gear of the rotor pos. 803 transmits torque to the helical gear of the intermediate shaft pos. 826.
Bosch 2-24 punch diagram
Bosch 2-24 punch countershaft design
The intermediate shaft of the Bosch 2-24 hammer drill consists of a rolling bearing assembly pos. 830, a clutch pos. 823, switching parts pos. 44. Most often, the clutch fails. The teeth wear out in it. Coupling repair consists in correcting the gear tooth profile in the coupling and on the intermediate shaft.
Intermediate shaft of the Bosch puncher 2-24 assembled
Impact shaft design
The shaft of the barrel of the shock block is designed to transmit a rotational impulse while moving the hammer.
The rotation is transmitted from the spur gear of the intermediate shaft to the large spur gear pos.22 of the barrel shaft pos.821.
The reciprocating movement is transmitted through the drunk bearing pos.830, the shock piston pos.26, the striker pos.27, the impact bolt pos.28 to the drill fixed in the cartridge pos.756.
The design is a shaft hollow on one side. Parts are mounted on the shaft on both sides.
On the side of the chuck mounting, the spur gear pos.22 is mounted on the shaft and fixed on the shaft using the roller pos.88, pressed against the shaft shoulder by the spring pos.88. The spring itself is fixed by a lock ring pos. 85.
In the cavity of the shaft of the barrel of the shock block is inserted: the assembled impact bolt pos. 28 and the shock piston. The shock piston pos. 26 is inserted into the shock piston pos. 27 with the new rubber ring pos. 73 put on it. All rubber products are lubricated with recommended grease.
Malfunctions of the shaft of the barrel of the percussion mechanism
Due to the weakening of the spring force, the loss of the locking roller, the gear can rotate on the shaft. This is manifested in the disappearance of the torque with the presence of a shock pulse.
Hammer hammer, but not drill.
When the rubber products (o-rings) are worn, the hammer stops working in the “Chiselling” mode. This happens gradually. The force of impact weakens as the rubber rings wear. The thing is that from a drunk bearing the movement is transmitted to the shock piston pos. 26, in which the striker pos. 27 creates air pressure and acts on the impact bolt pos. 28.
The puncher drills, but does not hammer.
If you apply great force during the work of the puncher, this can lead to the destruction of the shock bolt, jamming of the hammer in the shock piston. Such malfunctions can only be eliminated by the complete replacement of a failed part. Learn more about troubleshooting a Bosch rotary hammer.
Design Features of the Bosch 2–26 Hammer
Repair of the Bosch 2–26 rotary hammer must begin with an introduction to the design features of the tool to be adjusted. The principle of operation of the Bosch 2–24 rotary hammer is similar to the principle of operation of the Bosch 2–26 rotary hammer.
Schematic of the Bosch 2-26 rotary hammer
The rotation is transmitted from the rotor shaft, through the intermediate shaft, to the shaft of the shock shaft. At the same time, the drunk bearing mounted on the intermediate shaft transmits reciprocating motion to the shock piston.
The puncher has three operating modes: drilling with impact, drilling without impact, impact.
The helical gear of the rotor pos. 803 transfers the torque to the helical gear of the intermediate shaft pos. 823.
The intermediate shaft is similar to the shaft in the design of the Bosch 2–24 rotary hammer and is interchangeable with the parts included in the intermediate shaft of the Bosch 2–24, 2–26 rotary hammers. Instructions for disassembling the Bosch rotary hammer.
Impact shaft design
The shaft of the barrel of the shock block is similar in design to the shaft of the barrel of a Bosch 2–24 hammer drill. Failures are caused by malfunctions of the same parts as in the Bosch 2–24 hammer drill.
The scheme of the shaft of the barrel of the shock mechanism
The features of the shaft of the Bosch 2–26 punch are that the driven spur gear pos.22 is fixed to the shaft with three pins pos.37, unlike the fixing roller in the Bosch 2–26 punch.
When disassembling the shaft of the barrel of the shock block of the Bosch 2–26 hammer drill, pay attention to the way the gear is locked. Before removing the gear, three pins must be removed. The correct assembly procedure for the Bosch rotary hammer.
Conclusions:
- Knowing the differences between the given models of Bosch rotary hammers will allow you to quickly disassemble the tool, replace defective parts. To do this, you do not need to contact service.
- Structurally, Bosch rotary hammers are so simple that they allow you to repair almost any complexity.
- All that is required of you is the presence of desire and basic knowledge in mechanics.
It happens that there are fake models of Bosch rotary hammer drill about this in more detail.