How to disassemble the barrel of the Makita 2450 hammer drill

Makita hammer drill teardown review and salvage. What’s worth keeping?

Do-it-yourself Makita 2450 punch repair instruction

Hammer drills are percussion drilling devices designed for drilling and chiselling holes in particularly strong materials. The hammer drill implements two ideas: the working tool rotates and immediately moves longitudinally, creating a shock impulse.

Rock drills always work under extreme conditions. The duration of the hammer drills depends not only on the correct operating criteria, but also on the reliability of the parts included in the product.

But no matter how hard you try, over time, punches start to fail.

To properly repair the puncher, you need to study it with the device. Repair of the Makita 2470 and 2450 hammer drill can be independently performed by a person who has the skills of a locksmith and understands the bases of electrical engineering.

Remember! Observe safety rules and unplug the punch from the mains when disassembling.

Hammers Makita 2450 and 2470 are assembled in virtually a similar pattern and from the same parts. Repairing them is no different. For ease of repair, below is an assembly diagram and parts catalog for Makita rotary hammers.

The scheme of the Makita 2450 and 2470 hammer drill consists of a mechanical and electronic part.

The mechanical part provides the transmission of torque to the drill bit, creating an immediate translational movement that creates an impact. The mechanical part consists of a rotation drive and an impact mechanism.

The electronic circuitry of the Makita hammer drill provides the conversion of electronic energy into kinetic energy through the rotation of the rotor. The electronic part includes an electric motor, a power button with a speed regulator, a reverse switch, connecting wires. The main malfunctions of the makita puncher Malfunctions of punchers are divided into electronic and mechanical.

Further, we will see to our client the malfunction of the electronic part of the Makita 2470 and 2450 rotary hammers and methods for their elimination:

Electronic malfunctions of the Makita 2450 and Makita 2470 rotary hammers Electronic malfunctions appear in such a way that when the rotary hammer is connected to the voltage network, the tool is not cut in. The connection diagram of the Makita hammer drill to the network is ordinary.

The electronic circuit of the Makita 2450 hammer drill is essentially a serial connection of the electric motor, start button and wires. The scheme of the Makita 2470 rotary hammer is similar.

Through the connecting cord, pos. 72, the supply voltage of 220 V is supplied through the switch, pos. 68, and the electronic brushes through the brush holder, pos. 66, on the lamellae of the rotor of the electric motor, pos. 54. and through the contacts of the reverse switch, pos. 60, to the stator winding, pos. 59. The most common malfunction is the lack of contacts in the connections.

Makita Rotary Hammer Device

Among users, the Makita rotary hammer has established itself as the tool with the greatest functionality. It is durable and does not require special skills to use, lightweight and convenient during operation.

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Makita is widely used by people who prefer to do their own repairs. The tool is simple to operate, the financial maintenance costs are minimal, and it is inexpensive.

The manufacturer provides the following specifications:

  • Total weight. 2.04 kg
  • The SDS system allows you to mount the drills
  • Can be hammered and drilled
  • The system provides three modes of operation
  • The greatest number of beats per minute. 4500
  • Translational force of motion. 2.7 joules
  • The power of the mains supply is 780 watts.

Instructions for disassembling the Makita 2450 rotary hammer

Hammer drill, this is a hammer drill

Principle of operation

It can perform 3 functions: drilling, hammer drilling, chiselling.

Consumer reviews

Among users, ideas about the tool were divided. The disadvantage is overheating and grease leakage of the Makita 2450 hammer drill. Reviews also make it clear that the repair is done by the service center for a long time and not cheap. But, having eliminated the cause of the malfunction without the help of others, of course, wait for the normal operation of the tool. Often there are malfunctions with rotary hammers that have been produced at the moment. But earlier products are known to be of higher quality. This is due to the appearance of a huge number of low-quality fakes, made not using a unique technology.

How to disassemble Makita HR2630 rotary hammer drill tools holder and o-rings check maintenance

It is noted that this is one of the cheapest rotary hammers. It is lightweight, alas, the most powerful. In the purchase of the original and the usual appeal of the user during operation, the equipment will work for a long time and productively.

Having familiarized yourself with the features, diagrams of assembly and repair of the Makita 2450 hammer drill, there is an option to extend the life of this tool. By performing the service and changing parts without the help of others, the user will significantly save his money. In the matter of purchasing, one must take into account the corresponding differences of an unusual instrument. It will last longer than a fake.

Specifications

The hammer drill “Makita 2450” possesses a certain set of qualities. The characteristics presented by the manufacturer in the instructions are as follows.

disassemble, barrel, makita, 2450, hammer, drill

The tool weighs only 2.4 kg. The drills are supported by the SDS system. The hammer drill is designed for crushing, drilling and hammer drilling. It has three modes of operation. The idle speed is 1100 per minute, and the maximum number of strokes is 4500 per minute. The force of translational movement at the maximum is 2.7 J. Maximum drilling diameter:

  • for wood. 32 mm;
  • for metal. 13 mm;
  • for concrete. 24 mm;
  • for a hollow crown. 54 mm.

There are also additional functions for the Makita 2450 hammer drill. The characteristics highlight the presence of a safety clutch, reverse, lock of the power button, as well as electronic speed control.

The power supply power is 780 W. The cable length is 4m.

Mechanical malfunctions of the Makita 2450 and Makita 2470 rotary hammers

Frequent mechanical failures of Makita rock drills include:

  • destruction of the quick-release chuck;
  • failure of bearings;
  • breakage of the striking mechanism;
  • drill barrel wear;
  • wear of striker and striker rubber bands;
  • breakage of gears.

The hammer drill chuck is repaired to replace the boot and rubber ring, as well as the conical spring and the steel ball, which secures the working tool (drill). This is indicated by what is a working tool? namely the drill, does not hold well in the chuck.

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The main reason is the wear of the steel ball 7.0, item 20, art. 216022-2. Ball wear occurs from contamination of the bore of the cartridge due to the ingress of dust and dirt.

The general view and device of the Makita hammer drill chuck is shown in the photo below.

Do-it-yourself repair of the makita 2450 perforator cartridge is easy. The cartridge must be disassembled, freed from old grease, discarded rubber parts, replaced defective.

complex malfunctions require knowledge of the mechanical part of the Makita 2450 rotary hammer.

Having determined the nature of the malfunction of the Makita hammer drill, proceed to disassemble the mechanical part, called the gearbox.

Disassemble the mechanical part according to the attached video.
Free her from the old grease.
Carefully inspect all parts, their integrity, level of wear. All rubber products require replacement during any disassembly.

Consider repairing the barrel of a rock drill. Let’s analyze the mechanism completely.
Video of disassembly, lubrication and assembly of the Makita rotary hammer

Bulkhead rotary hammer Makita 2450

How to repair the Makita HR 2450 rotary hammer if the impact mode is gone

As a result, the drummer jammed in the fragments of the collapsed bushing.

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

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

Switch malfunctions

In the process of getting acquainted with the question of how to assemble “Makita 2450”, you should find out the frequent malfunctions of the switch. They can be caused by wear on the metal pins. In this case, any of the modes will not be activated. The switch will need to be replaced. This should be done also in case of breakage of the landing lugs.

If the rubber ring is worn out, there will be a slight leakage of grease. We’ll have to replace him.

It happens that the beak of the retainer breaks, with which it is attached to the depressions of the gearbox. The tabs may be damaged. To avoid all of the above damage, you need to handle the tool carefully.

Signs of counterfeiting

Due to the great popularity of the presented equipment, there are frequent cases of its counterfeiting. There are special features that define a fake HR 2450 rock drill. These include a short cord (approx. 0.5 m). The letters on the black fasteners of the suitcase are matte on the counterfeit, while on the original. shiny.

In the photo of the punch in the instructions for this product, the background is light gray, almost white. The copy will have a dark, dull background color in the image.

If Japan is listed as the manufacturer on the HR 2450 case, it is not a real instrument. The original says: “Made in P.R.C.”, that is, “made in China”.

The “Makita 2450” includes a rubberized handle bearing the serial number. All details of the suitcase must also each contain their own designation. The fake handle is not made of rubber, but of plastic. This should also signal the need to abandon the purchase of such an instrument.

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Specifications

The hammer drill “Makita 2450” possesses a certain set of qualities. The characteristics presented by the manufacturer in the instructions are as follows.

The tool weighs only 2.4 kg. The drills are supported by the SDS system. The hammer drill is designed for crushing, drilling and hammer drilling. It has three modes of operation. The idle speed is 1100 per minute, and the maximum number of strokes. 4500 per minute. The force of translational movement at the maximum is 2.7 J. Maximum drilling diameter:

  • for a tree. 32 mm;
  • for metal. 13 mm;
  • for concrete. 24 mm;
  • for a hollow crown. 54 mm.

There are also additional functions for the Makita 2450 hammer drill. The characteristics highlight the presence of a safety clutch, reverse, lock of the power button, as well as electronic speed control.

The power supply power is 780 W. The cable length is 4m.

Disassembly diagram

In the process of repairing the presented equipment, the user must be able to disassemble the tool. The assembly diagram of the “Makita 2450” hammer drill has many units and elements. To carry out repairs, you should not know all of them. Here are the most basic elements that the diagram represents (“Makita 2450”. The device is very complex).

First. this is a retaining ring. It participates in the process of dismantling the cartridge cover. Next comes the annular closure. It holds the ball for fixing the drill. It is guided by a washer and a conical spring.

The gearbox is connected to the motor by 4 screws. There are many rubber parts in the circuit, which, when worn out, become a frequent cause of breakage.

This knowledge is enough to carry out repairs at home. Next, you should familiarize yourself with the technique of its implementation.

Faults in the gearbox housing

The case of the HR 2450 model is characterized by high durability; breakdowns in this unit are quite rare. But it happens that certain troubles occur here too. If the housing came with the needle bearing, it means that its seat is badly worn out. When this part is very loose, the case should be replaced.

Sometimes the intermediate shaft seat is broken. Repairs are supposed to be similar to the first case.

The gear housing washer has an oil scraper ring. If it is damaged by construction dust (which happens extremely rarely) or careless actions of the repairman, it is changed along with the body.

The same procedure is carried out in the event of failure of the mode switch holes. The listed types of breakdowns are typical for fake copies.

Reducer housing

To remove the housing from the gearbox, lift the tool barrel up. The punch should be pressed against the workbench while pulling the shell upwards. In this position, all parts remain in place.

After their revision, check and replacement, the gearbox housing is installed in place. All its elements must be located in their original form. Required elements need to be lubricated.

During assembly, the gearbox housing must be cleaned with kerosene or gasoline. Next, the shell is put on in its original place. The mode switch should not be in it.