Model “Makita HR2470”
Model characteristics “Makita HR2450”
The impact energy of this punch is exactly 2.7 J. The power consumption of the device is at around 780 W. At the same time, the number of beats per minute is very high (approximately 4500 times). Also of note is the excellent idle frequency. The drill makes 1100 revolutions in one minute. The rock drill weighs 2.4 kg. The maximum drill diameter for working on concrete surfaces is as much as 24 mm. On a steel surface, in turn, a hole of 13 mm can be made. As for the tree, this is the biggest indicator. 32 mm.
First rotary hammers “Makita”
In 1958, the first hand drills, screwdrivers, and hammer drills began to be produced. In 1962 the company “Makita” heard the whole world. After some time, branches began to be created in many countries, including the United States of America, France and Canada. The number of factories grew continuously. New representative offices of the company were also created. As of 1989, there were already 8 large factories. New markets in Germany and China began to conquer.
We should pay tribute to the company’s management, which made every effort to produce quality products that would be in demand. In 1991, small factories began to join the company “Makita“. Among them was a chain saw factory. Today the company produces various models of electrical appliances and spare parts for a hammer drill. “Makita”.
In many ways, the secret of the company lies in the specialists. All employees of the company undergo long training and receive high qualifications. over, in “Makity” the Partner network is very developed, therefore the company participates in seminars and adopts the experience of specialists from all over the world all the time.
Additionally, the company has very high quality service. There are many service centers, so get, for example, spare parts for a rotary hammer “Makita “presents no difficulty.
How to disassemble a puncher “Makita”?
To disassemble the punch, you need to superficially familiarize yourself with its device. Many models differ in design. However, they all have common components: motor, gearbox and impact mechanism. To see all the components and disassemble them, just remove the protective cover and Unscrew the 4 nuts. Below is the diagram: perforator “Makita” in the context.
Model “Makita HR2810”
Model characteristics “Makita HR2470”
The power consumption of the device is 780 W, and the average idle speed is 1000 units. over, the maximum values sometimes exceed the mark of 1100 units. A high frequency is available for hammer drilling. In general, this rotary hammer “Makita HR2470” capable of over 4,000 beats per minute. In this case, the maximum energy is 2.4 J. The power of the perforator is carried out as standard from a 220 V network. For high-quality operation, a keyless chuck is provided. From the advantages of this model, one can additionally highlight the ability to work with drills of both large and small diameters. Holes from 5 to 33 mm can be drilled on a wooden surface. For working with metal, drills from 6 to 14 mm are provided in the kit. Also puncher “Makita HR2470″ capable of making holes in concrete. For this, drills from 5 to 18 mm are available. Consumer reviews mark this model as universal, suitable for all working conditions.
Setting the mode selector lever
The mode switch is designed to transfer the clutch, pos. 39, to various positions and transfer the translational motion to the percussion shaft through the rolling bearing, pos. 41, to the cylinder, pos. 32.
Makita 2450 Punch Mode Switch Lever Assembly
On the inner case, you need to put on the mode switch lever pos.82, from above the pressure spring pos.88, will crush it with a flat washer pos.87. Install the circlip, pos. 86. And fix it. The retaining ring must be carefully fixed. Turning the intermediate shaft, it is necessary to carefully check the correct operation and free movement of the cylinder in the housing. This must be done now so that it does not become clear at the end of the assembly that the assembly is assembled incorrectly.
Assembling the reducer assembly
The assembly of the gear unit is carried out on the inner casing pos. 49.
By the way, there are cases when wasps pop out of the inner aluminum case. Both axles are pressed into the housing.
The assembled intermediate shaft is inserted into the housing of pos. 49, the rolling bearing lever of which must fall into the hole of the cylinder hinge. In this case, the rolling bearing lever pos. 41 of the intermediate shaft must fall into the cylinder hinge, pos. 32, and the lower intermediate shaft bearing into the housing. This procedure is usually performed by shaking the structure until the parts are completely in the indicated places.
Impact shaft assembly
First, you need to lubricate the inside of the cylinder (pos. 32) and insert the striker (pos. 30) into it.
Remaining in the inner body, pos. 49, will put the lubricated barrel assembly, pos. 21, in place, putting it on the lubricated cylinder, pos. 32. As a lubricant, it is recommended to use a special grease developed for Makita rotary hammers. Lubricants are available in several types: Makita P-08361 and Makita 183477-5 SDS-PLUS. Makita Grease 183477-5 SDS-PLUS is recommended for the gearbox. For drill shanks, Makita grease 196804-7 is used.
Lubricants vary in color, but have exactly the same characteristics. And what other lubricants are used in the Makita 2450 and 2470 hammer drill?
And here we have an assembled mechanical block.
Assembling the striking mechanism
How to assemble the hammer mechanism of the Makita rotary hammer? The percussion mechanism is assembled from two units: a barrel shaft with a spur gear and an intermediate shaft with a rolling bearing. A). A spur gear, pos. 19, is put on the barrel, pos. 21, and pressed by the compression spring, pos. 18. To fix the spring, it is pressed with a washer 30 pos. 17 and secured with a retaining ring 28 pos.16.B). To assemble the striker, it is necessary to put the ring 9, pos. 25 on the shaft of the striker, pull the rubber ring, pos. 26, press down with the metal ring, pos. 27.
Now we go to the opposite side of the barrel, pos.21. On the other hand, the inner surface of the barrel must be lubricated with grease and inserted into the assembled drummer, pos. 24.
Assembling the intermediate shaft and piston
General disassembly and assembly of the Makita 2450 rotary hammer
Check its performance by rotating the intermediate shaft and control the movement of the piston in the percussion mechanism. All!
Now fry all parts of the mechanical block with the recommended grease. Here is an example of how to properly lubricate rotating surfaces and here is another example of generous lubrication of a mechanical block.
You can’t spoil porridge with butter
So also applies lubricant. You can’t spoil porridge with butter!
The lubricated mechanical block must be closed with a black plastic housing pos. 14. Put the body on top of the knot, press the body down to fully fix the knot in it. Backwardness, insert four bolts, pos. 10, into the body and tighten. Now it is the turn of the connection to the mechanical part of the electric motor rotor.
Installing the rotor
The helical gear of the rotor is tightly inserted into the housing of the mechanical block and pressed.
It remains to insert four self-tapping screws m4 × 60 pos. 57. And screw them into the body of the electric unit.
The order of assembling the punch Makita 2450
If the hammer drills have any mechanical malfunction, then its presence can be determined by ear (noise increases, rattling appears).
So, the following can be attributed to mechanical failures:
- Breakdown of the device operating mode switch;
- Worn striker and striker rubber bands;
- Failure of the striking mechanism;
- Failure of the unit barrel due to wear;
- Breakage of gear teeth;
- Chuck breakage, causing storms to fly out.
The main malfunctions of the punch and their external signs
All unit faults can be divided into 2 groups: mechanical and electrical.
Diagram of the percussion mechanism, its malfunctions and repair
The impact mechanisms of perforators differ in their design, depending on which family the devices belong to. Therefore, the repair of these mechanisms will take place according to different principles.
The reason that the device stopped working normally, namely, stopped drills and chisel, may lie in worn teeth on the rotor shaft.
If this happens, the teeth will also be worn out on the intermediate helical gear.
This problem occurs when the tool is jammed or the clutch is not working properly. Breakage is eliminated by replacing the intermediate gear and the engine rotor.
Malfunctions associated with the electrical part of the hammer drill can also be accompanied by an unpleasant odor from the body of the device, arcing. You may also notice that the engine quickly heats up and hums without spinning, or smoke appears from it.
Electrical breakdowns of the device include such as:
- The device does not turn on;
- Breakdown of the start button;
- Wear of brushes;
- Collector clogging;
- Violation of electrical contacts;
- Burnout of the stator or rotor winding of an electric motor.
Rotary hammers with a vertical engine usually have an impact unit based on a crank mechanism (KShM). Below is a diagram of this type of striking mechanism.
The next photo shows the device in section, where you can see the location of the KShM.
The hammer mechanism of a vertical motor unit may have the following malfunctions. The connecting rod mechanism has a separate bearing, which is mounted on the cams of the wheel with an eccentric, but sometimes it can be located at the base of the connecting rod. In some models of rock drills, a sleeve bearing (instead of a rolling bearing) can be installed in this place, which requires constant lubrication. If it is not there, or it is already old, then this knot wears out. When repairing, you will have to completely replace the connecting rod and the eccentric barrel.
Another common problem. The firing pin has broken. This malfunction can be calculated if you notice that there is no more impact on your hammer drill. To get to the striker, you will need to completely disassemble the barrel of the device. It is done as follows.
- Detach the barrel from the punch body, Remove the cartridge (see description above). Knock the barrel against the table so that the piston falls out of it. Take a rubber mallet and knock the barrel out of the body.
- Remove the circlip holding the bearing.
- Remove the bearing itself and lightly tap on the table Remove the balls.
- After removing 3 balls, you can pull out the raster sleeve.
- Also, as in the previous case, Remove the balls that are on the sleeve, just do not confuse them with the topic that you removed earlier (these balls are of a smaller diameter). After removing the balls, you need to insert a screwdriver into the sleeve and push out the firing pin.
In this case, the firing pin is intact. But if it is broken, then replace it with a new one. You should also pay attention to the rubber bands and the oil seals in the barrel body. If they are worn out, they must be replaced.
Assembling the Makita Rotary Hammer
After the repair is made, all the removed parts should be returned to their original position. It is recommended to apply a fresh coat of grease to all required parts.
Before assembling, the body is cleaned with kerosene or gasoline. The cleaned casing is returned to its place. The mode switch must NOT be in it.
Makita HR 2450 diagram
The Makita-2450 hammer drill system consists of many complementary assemblies and a list of spare parts. Among the most significant elements, the features of which should be taken into account during repair work, are the following:
- Ring locking device. It is designed to hold the storm-catching ball element. Washer and spring guide it
- Retaining ring. It is necessary for correct removal of the cartridge cover.
- Four screws connect the gearbox and the motor, eliminating vibration. The circuit contains a large number of rubber components. They are often a prerequisite for a malfunction.
The description of the mentioned units will be enough for a quality repair.
Why is it undesirable to hammer with a Makita hammer drill??
Often, equipment fails, and storms fly out of the perforator. This happens for various reasons. Many users of Makita rotary hammers are faced with the fact that their device does NOT hit, but drilling while doing so. You can fix the breakage yourself. The most common causes of malfunctions are presented below:
- Worn intermediate shaft
- Deformation of the clamping units
- Broken connecting rod system
- Lack of lubrication for correct operation
- Breakage of shock components
How to disassemble a hammer drill and reducer?
When disassembling the gearbox, it is recommended to adhere to the following instructions:
- Install the rock drill on a hard surface by lifting its barrel up
- Pull the shell with progressive movements, press the tool to the table. This position will prevent accidental displacement of component parts.
Timely punch repair: how to properly disassemble a Makita punch?
Today, developers offer customers hundreds of different apartments and houses. Often, tenants want to slightly change their parameters, making housing more convenient and comfortable. Makita hammer drills allow you to carry out repair work efficiently and quickly. Prefabricated parts and good build quality will increase the lifespan and help avoid interruptions during the restoration process. The article will give an idea of the main advantages of the products of this manufacturer.
Punch Makita DIY repair
Diagnostic technology and troubleshooting are identical to the second devices. First you need to disassemble the tool, removing the case, and then remove the obsolete grease and contamination.
Nodes that stopped working are recommended to be replaced. After that, all the components of the mechanism are set to their original position.
For correct operation, it is recommended to carefully study each repair point. To restore the functionality of the 2010 cartridge, mode switch and housing, the following steps should be performed:
- Remove cartridge
- Remove switch
- Eliminate defects in the inner part of the case
- Apply grease and replace worn parts