We disassemble the gearbox
To get to the mechanical part, you need to remove the plastic case.
The procedure for disassembling the mechanical part of the Makita rotary hammer First, the protective black plastic case is removed. The case is removed after you Unscrew the four screws securing the case from the end. Pressed on the end of the shaft, you give the gearbox out of the housing.
After removing the housing, it is necessary to separate the rotor from the gearbox. A general mechanical part is called a reducer. It is easy to separate the rotor from the mechanical part (gearbox). Clamp the gearbox with your right hand, clamp the rotor with your left. Wiggle, pull both parts in opposite directions. The rotor is held in the gearbox by friction of helical gears.
The main malfunctions of the Makita rotary hammer occur in the mechanical part of the tool.
The most typical malfunction for the mechanical part, failure of the percussion mechanism.
Disassembly of the percussion mechanism The percussion mechanism is assembled on the inner casing and consists of a reducer shaft and an intermediate shaft. The rotary movement is transmitted through helical gears to the intermediate shaft.
The gearbox shaft is a hollow barrel, in which the cylinder moves freely.
A small spur gear mounted on the intermediate shaft transfers rotation to the large spur gear of the gearbox shaft, in which the percussion mechanism is mounted. And the translational movements on the shaft of the gearbox of the percussion mechanism are simultaneously transmitted through transmission from the rolling bearing of the intermediate shaft to the cylinder moving in the barrel of the gearbox.
We proceed to disassembling the intermediate shaft.
Dismantling the intermediate shaft
A helical gear, pos. 42, is mounted on the shaft, pos. 42, to which rotation is transmitted from the gear of the rotor, the rolling bearing 608zz, pos. 41, which transmits the translational motion to the hinge, pos. 34, of the piston, pos. 32. On the other side of the shaft, a clutch clutch pos. 39 is installed, a spur gear 10 pos. 80, a compression spring pos. 38, a circlip S-7 pos. 37, bearing 606zz pos. 36 Particular attention should be paid to the condition of the rolling bearings. Imported bearings are installed in the hammer drill. Installation of domestic bearings is allowed.
Bearing 606zz can be changed to 80016, bearing 609zz can be changed to 80019.
Moving on to disassembling the shock mechanic’s shaft
Disassembling the hammer shaft disassembling the barrel of the Makita 2470 hammer drill is a simple process if you use the diagram of the Makita hammer drill. The shaft is a barrel poz.21, in which the impact mechanism is assembled. Gears, pos. 19, are attached to the barrel, which is pressed down by the spring, pos. 18, through the washer, pos. 17, and fixed with a retaining ring, pos. 16.
The cylinder, pos. 32, moves in the barrel, acting on the firing pin, pos. 24. On the reverse side of the striker, a metal ring pos. 27 is fixed, transmitting the blow to the drill.
And when you need to replace the drill barrel?
Most often, the metal ring fails.
Cylinder with drummer
We figured out the disassembly. We change the parts for a serviceable one and get ready to assemble. Learn more about rock drill lubrication and assembly.
Read if there are problems with the electrical part of the hammer drill.
Assembling the striking mechanism
How to assemble the hammer mechanism of a Makita hammer drill? The impact mechanism is assembled from 2 units: a barrel shaft with a spur gear and an intermediate shaft with a rolling bearing.
AND). 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, you need to put the ring 9, pos. 25 on the shaft of the striker, pull the rubber ring, pos. 26, press it with the iron ring, pos. 27.
Now we run over to the reverse side of the barrel, pos. 21. At the same time, the inner surface of the barrel must be lubricated with grease and pushed in. Assembled drummer, pos. 24.
Assembling the intermediate shaft and piston
Dismantling the mechanical block of the impact unit
The mechanical assembly is assembled on the inner case, pos. 49. To remove the intermediate shaft, unscrew two bolts pos. 43 at the base of the body. The intermediate shaft is also fixed with the mode selector lever.
Two words about the mode switch
In hammer drills Makita 2450, 2470 a lever is installed, which provides the tool with three modes of operation. The hammer drill can simply drill, just chisel, and chisel with simultaneous drilling. The switch lever is put on the axis of the inner case and is fixed by a compression spring, pos. 85, a washer, pos. 87, and a retaining ring, pos. 86.
It’s time to remove the intermediate shaft.
Disassembly of the electronic part of the Makita 2450, 2470 rotary hammer
The electronic part of the Makita 2450,2470 hammer drill includes:
- Switch TG813TLB-1 pos. 68;
- carbon brushes SV-419 pos. 65;
- brush holder pos. 63.66.
To remove the stator, just knock on the end of the greenish plastic housing of the unfamiliar stator with a wooden mallet on the second bar.
But first you need to Unscrew the two self-tapping screws 4 × 60 mm pos. 57.
At frequent tapping on the body, the stator spontaneously protrudes beyond the edges of the body, and then is removed by hand.
Other elements of the electronic part of the Makita 2450 or 2470 rotary hammer can be easily dismantled, as they are NOT attached.
Disassembly of the punch finished.
Makita 2450 Rotary Hammer Disassembled
How to repair the cartridge and percussion mechanism of the barrel of the Makita 2470 rock drill
Due to the ingress of dust, dirt and water, the internal lubrication becomes hard over time and does not even make its own purpose. The hammer drill starts to work with outside noise. When starting to repair a hammer drill, be sure to familiarize yourself with the attached annotation on disassembly, lubrication, and assembly of the Makita 2450, 2470 hammer drill units. In addition, we will tell you how to disassemble the Makita 2450 hammer drill.
Dismantling the Makita 2470 punch begins with removing the mode switch knob.
Makita Rotary Hammer Reverse Switch Repair
When repairing the reverse switch, the rear cover must be detached. Disconnect the wires carefully from the button. Look closely at the switch.
The upcoming disassembly consists in removing the brush holder, having previously released the brushes themselves. By removing the brush holder, you will reach the contacts of the reverse switch.
Determine its condition, change contacts if desired.
Additional, often occurring electronic malfunction, poor contact of the stator boundaries and the lower contacts of the reverse switch.
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.
Let’s disassemble the mechanical part according to the attached one. Free it from the old grease. Take a close look at what remains to be done by our client, parts, their integrity, level of wear. What remains to be done for our client? Rubber products require a change at any disassembly.
Let’s consider the repair of the perforator barrel. Let us examine the mechanism completely. Disassembly, lubrication and assembly of the Makita rotary hammer
: Bulkhead rotary hammer Makita 2450
Remember! At the bottom of the housing, the rotor is held by electronic brushes, which must be pulled out without fail.
Next, you need to disconnect the rotor from removing the mechanism. The rotor is simply disconnected from the mechanism by pulling it out, as it is held due to the friction of 2 helical gears.
This is such a dirty knot came out.
Now we need to separate the percussion shaft.
In most cases, rubber rings wear out, firing pin pos. 24 compressor spring pos. 18. And cylinder parts.
Oh yes, barrel parts wear out and collapse if the tool is misused.
Let’s take a look at the Best Complex Malfunction. Damage to the striking mechanism. Corresponding signs of failure of the percussion mechanism are the absence of a blow and the nasty noise of a working punch working in the mode Hit.
: Minute of vandalism) (21) Hammer drill Makita HR 2450 Powerful recoil on impact mode
Such a malfunction is characteristic of rotary hammers, which, during use, were very pressed against the surface to be treated. Having disassembled the gearbox, we remove fragments and pieces of third-party items. We find the faulty part and all the rest We clean it from the old grease.
The striker, pos. 24, art. 324396-8, included in the barrel.
Iron ring pos. 27. Art. 324216-6.
Discard warped parts, change to new ones, Cover with a thin layer of grease. The parts are ready for assembly. However, about this decision in a subsequent article.
How to repair the Makita HR 2450 rotary hammer if the impact mode is gone
Makita power tools have long established themselves as professional, reliable and easy to maintain. It also has good maintainability and low price.
Of all the lines of rotary hammers, I would like to dwell on the Makita HR 2450 model. The tool is very comfortable to use, has three modes of operation and can withstand very long loads. In the creator of THESE term, the hammer drill has worked reliably for more than 6 years without breakdowns. over, it was used while working in the mode of saturated loads.
However, as we know, nothing infinite exists. And reliable technology breaks down. Somehow, in the midst of work, He did not hammer. Working in rotation mode, the machine worked, but the blow suddenly disappeared.
The gearbox was disassembled and the cause of the breakdown was identified. The bushing was broken in the barrel body when the hammer (firing pin) specifically makes impact work.
For this reason, the drummer is jammed in the fragments of the collapsed bushing.
The service recommended changing the barrel completely. It turned out that the bushing is pressed into the barrel at the factory and is NOT supplied separately. I had to take a completely new barrel.
Here the creator will tell you how to bring the hammer drill into working condition after this, in general, light breakdown. If, of course, you have the ability to repair power tools and the desire does not pay someone your hard-earned funds, then we take the tool and start disassembling the machine.
Two simple flat-head screwdrivers and one cross-head will come in handy. One of the flat screwdrivers can be narrow or narrow, less than 4 mm wide. A wire hook is also useful to remove the retaining ring. It is made of a bicycle knitting needle, the main thing is that the wire is rigid and simply does not unbend. You will also need a rubber hammer or a wooden Kiev woman.
Disassembly of the punch should be started by removing the protective rubber cap. Anther. It just comes off, just take it with your fingers and pull it off the barrel.
Then, I pressed on the plastic cover and squeezed the spring of the SDS mechanism lock, remove the locking ring with a screwdriver.
Remove the stopper using a screwdriver
The cover is removed from the barrel, and behind it, again squeezing the spring, we take out the locking ball together with the spring and the figured washer.
After that, the mode switch is disassembled. Under the lid holding the reddish release button, of course, there is a special slot for a screwdriver. I inserted a screwdriver into the myth groove and prying the lid a little at first from the edge textbook, and then from the second, carefully remove it. It is not recommended to make significant efforts, the cover is still plastic and may break. The reddish button together with the spring is removed from the switch body, and it is transferred to the left in full, rumors beyond the drilling mode. It is from this position that it is removed from the gearbox. For this operation, the switch must be slightly picked up with a thin screwdriver on both sides and removed together with a rubber O-ring.
Remove the punch mode switch
Now the gearbox is being removed. Using a Phillips screwdriver, unscrew the four bolts connecting the box to the stator housing. Then, holding it with your hand, you need to hit a little with a mallet on the end of the barrel so that the box comes off the gearbox.
Remove the gearbox
After removing the box, we take out the barrel from the gearbox. He is filming just.
We take out the barrel from the gearbox
With a rag, you need to remove the old grease, and wash the barrel with gasoline with a second kerosene and wipe it dry.
What is needed, as mentioned above, required a 100% change in the entire barrel. But this item purchased at a car service turned out to be goal like a falcon. In other words, absolutely nothing happened here, and what remains to be done for our client is the details from the old barrel are rearranged to the newest blank.
The most difficult operation was removing the striker from the barrel body. There are special holes in the barrel body through which the retaining ring is visible. This ring holds the firing pin with rings and rubber dampers in the body seat. I inserted a narrow screwdriver into the hole, bend the ring a little. We do this at first a positive moment in one, and then on the other. The stopper must come out of the groove.
Using 2 screwdrivers, squeeze the stopper
Then from the inside with a homemade wire hook we pull out the stopper into the light of day.
With a wire hook, remove the stopper from the inside
Next Removing the firing pin with washers and rubber rings. It is necessary to understand or sketch the placement of all rings and washers for assembly. If something does not go to the same extent, photos and pictures from the article will help.
Now you need to remove the gear from the shaft. Pressing on the washer and squeezing the spring, use a narrow screwdriver to remove the retaining ring from the groove. After removing it, remove the washer, spring and gear from the barrel.
The toothed wheel is pushed onto the new barrel and engaged with the splines. Next, a spring with a washer and a stopper are installed at this address. It is necessary to insert the retaining ring and fix the mechanism in the working position.
For this purpose, you should take the barrel in both hands and, resting it on your palms, with your fingers squeeze the spring with force, immediately slide the washer and stopper down. You need to squeeze until the stopper does NOT enter the groove.
Then a firing pin with washers and rubber rings is installed inside the barrel in the order in which he understood. However, before that you need to check the condition of the drummer, his appearance.
If the firing pin has dents and cavities after a long work on the second one because it was scratched on a broken bushing, then it should be slightly sanded.
For this purpose, it is clamped into a drill chuck and processed with fine emery cloth. If the bulge is very large, then the drummer will be easier to change.
It is necessary to lubricate the firing pin with special grease before installation and in the near future use the lubricant during operation. Insert the storms into the hammer drill, you need to apply a little grease to its shank. This prolongs the service life of the machine.
Installed the striker mechanism in the barrel, securing it with a retaining ring. Using a screwdriver, we try the feat of the striker on both sides from the inside of the barrel. He should just walk in the canal and won’t even stop by.
Assembled barrel Install in the gearbox housing. Put it on the cylinder with the piston, put it in mesh with the drive gear and insert it into the body. Our client is left with parts that should be perfectly lubricated during assembly.
Installing the barrel into the gearbox
Then we Install the gearbox, having previously lubricated the needle bearing. With 4 bolts we pull the box to the stator case and install the operating mode switch to the area. For this purpose, we set it to the position, rumors to the left of the drilling mode. Insert the reddish spring button and move the switch to the drilling mode. Snap the plastic cover and check the switch.
Install the mode switch to the area
Snap the cover of the punch mode switch
Then, ending with a chord, the SDS mechanism is assembled. Install the mechanism spring, put on a figured washer and insert the ball. After completing the plastic cover, squeeze the spring of the mechanism and insert the retaining ring. Putting on a rubber boot is no longer difficult.
Squeezing the spring with a washer, Install the ball retainer
Installing the SDS mechanism
Trying the hammer drill under load. During the operation of the machine, there is NO extraneous noise in the gearbox, the operating mode switch should simply move without jamming. So, everything should work like a breakdown.
The creator of this article hopes that it will help esteemed readers understand the repair of a hammer drill. It doesn’t matter what kind of breakdown is possible it will be easy if you find its cause. And then everything depends on your skill and diligence.
In the construction industry, the use of Makita rock drills is very important. The value of this technique can hardly be overestimated, it is irreplaceable when working with concrete, stone, as it is also called brick. Our client is left with particularly strong materials that lend themselves to the pressure of this versatile tool. In everyday life, Makita hammer drills are used to drill holes in concrete and stone, for the production of Clearances, grooves, cable channels in the walls and in the floor.
The Makita hammer drill has a double protective motor insulation. In the midst of the indivisible parts of the structure. A release clutch that prevents a jerk when the drill gets jammed and an electric speed control. Indicator of corporate identity. The tool is equipped with a comfortable tool case.
Most of the models are equipped with a dust extraction system and come with a soft rubber grip on the handle. The range includes Makita rotary hammers, both with straight and vertical motor arrangement.
It can do 3 functions: drilling, hammer drilling, chiseling.
Suspension from the number of functions performed, they are divided into three groups:
- Single-mode. Drilling with hammer, for example, Makita HR 2010.
- Dual-mode. Drilling and hammer drilling, or hammer drilling and chiselling. The most popular hammer drill is. Makita HR 5001 C can hammer drills or hammer.
- Three-mode. Switch to any mode of operation. For example, Makita HR 2450.
- The SDS Plus chuck is available in one, two and three mode rock drills up to 5 kg. Feature: power up to 850 W, impact force up to 5.3 J, drilling diameter in concrete 18-30 mm.
- Two- and three-mode models with weight from 5, 9 kg are offered with SDS max chuck. Trait: power 1100-1500W, impact force 8, 3-17, 5J, largest drill diameter 40-50mm, crowns 105-160mm. Advantages: Highest power and low vibration.
Score Makita. It is a dealer of a Japanese company and offers a wide range of Makita rotary hammers with a manufacturer’s warranty and delivery. Professional managers who have completed training courses will help the Elect to the best model!
We want to offer Makita perforators throughout Russia: Moscow, St. Petersburg, Yekaterinburg, Chelyabinsk, Nizhny Novgorod and other towns with delivery and warranty, call! Find out detailed information about the methods and of delivery You can contact our managers.
Due to the ingress of dust, dirt and moisture, the internal lubricant will harden over time and will NOT fulfill its intended purpose. The hammer drill starts to work with abnormal noise. When starting to repair a hammer drill, be sure to read the attached instructions for disassembling, lubricating, assembling the Makita 2450, 2470 hammer drill assemblies. The Makita 2450 and 2470 hammer drill diagram will help you to properly disassemble faulty components, find the defective parts. We will also tell you how to disassemble the Makita 2450 rotary hammer.
Dismantling the Makita 2470 punch begins with removing the mode switch knob.
Quick release chuck assembly procedure
Assembly is done on a clean surface. Parts pre-washed, dried and lubricated with a thin layer of recommended grease.
The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. All incoming parts of the cartridge are assembled on the shaft in a certain sequence. I installed a conical spring, pos. 6, put on the guide washer, pos. 5, and fix it with a ball, pos. 20, inserted it into the groove of the gearbox shaft. It remains to put on the ring pos. 4, clutch cover pos. 3, fix the parts with the locking ring pos. 2. At the last stage, insert the protective tip pos. 1 into the end of the cartridge; It remains to check its quality, inserted into the cartridge of storms. When properly assembled, the cartridge keeps storms from falling out spontaneously. Cartridge assembled.
I got to my punch makita HR 2450, which lost its punch at the peak. There is an internal blow, but it is not transmitted to the face. In this you will see how to disassemble and assemble the punch makita HR 2450 How to remove the mode switch of the punch makita HR 2450. 0:33 How to remove the chuck of the punch. 1:16 How the hammer drill gearbox is disassembled. 2:05 How to assemble a gearbox. 19:15
Home page Makita 2450 Disassembly
Even very reliable Makita rock drills break down over time. No matter what kind of breakdown is eliminated, you just need to have straight arms and assertiveness. NOT counting electronic defects, rotary hammers are also subject to mechanical damage.
The work of rock drills with hard materials in a dusty environment reduces the service life and asks for user intervention during repairs.
Any tool repair begins with determining the nature of the malfunction and disassembly.
Repair of the Makita 2450 and 2470 rotary hammer can be done by a user who has the original locksmith skills and is familiar with electrical safety requirements.
The mechanical part of the Makita rotary hammer is considered here, the main malfunctions and methods of their elimination.
Dismantling the mechanical part of the Makita 2470 rotary hammer
To get to the mechanical part of the punch, you need to remove or disassemble the cartridge.
Disassembling the quick-release chuck Install the punch on the rear case cover on a table surface covered with a clean cloth or paper.