How To Assemble A Makita 2450 Hammer Video • CIMFLOK.COM

DIY Makita 2450 punch repair manual

Hammers are called percussion drilling devices designed for drilling and chiselling holes in particularly strong materials. Two ideas are implemented in the puncher: the working tool rotates and immediately moves longitudinally, creating a shock impulse.

Hammers always work in extreme conditions. The duration of the drill 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, punchers begin to fail.

To properly repair the hammer, you need to study its device. Repair of the Makita 2470 and 2450 rotary hammer can be performed independently by a person who owns the capabilities of a locksmith and understands the basics of electrical engineering.

Remember! Compliance with safety regulations and disconnect hammer drill from the network during parsing.

Makita 2450 and 2470 rotary hammers are assembled practically according to a similar scheme and from among the same parts. Repairing them is no different. For ease of repair, the assembly diagram and catalog of parts for Makita rotary hammers are given below.

The Makita 2450 and 2470 rotary hammer circuit consists of a mechanical and electronic part.

The mechanical part provides the transmission of torque to the drill bit, creating immediately translational movement, creating a shock. The mechanical part consists of a rotation drive and a percussion mechanism.

The electronic circuit of the Makita rotary hammer provides the conversion of electronic energy into kinetic through the rotation of the rotor. The electronic part includes an electric motor, a power button with a speed controller, a reverse switch, connecting wires. The main makita rotary hammer malfunctions The malfunctions of the rotary hammers are divided into electronic and mechanical.

Next, we will examine our client remains the faults 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 punchers Electronic malfunctions appear in such that when the punch is connected to the mains voltage, the tool does not cut. The connection scheme of the Makita rotary hammer to the network is ordinary.

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

Through the connecting cord, pos. 72, the 220 V supply voltage is supplied through the switch pos. 68 and electronic brushes through the brush holder pos. 66 to the lamellas of the electric motor rotor 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.

The procedure for determining electrical faults

Video: Disease Makita HR 2470 Finished cutting into the puncher 2470 Burned contacts maintenance tool

Determination of the integrity of the electronic part of the Makita rotary hammer. If you set a goal to repair a Makita 2450 rotary hammer or a Makita 2470, you yourself need to arm yourself with devices and equipment. Any tester, a set of screwdrivers, wrenches, a hammer, a wooden extension will work. It is great to have a screwdriver with an integrated phase indicator.

You need to take the tester, connect to the ends of the punch plug and press the punch switch. If the tester indicates some resistance, then the power supply circuit of the punch is intact.

If the tester indicates infinity, then the integrity of the circuit is broken and it is necessary to remove the back cover to control the connecting cable and electric brushes of the punch.

The back cover (usually dark) of the punch is easy to remove, you just need to unscrew the three screws with a screwdriver or screwdriver.

Remove the cover and use a screwdriver to disconnect the ends of the wires from the electric brushes. Using a tester or a home-made device, also called an “arch”, determine the integrity of the lead wires and the correct operation of the switch.

A few words about the ordinary control device, the name of which is "arcade". The device consists of an LED or a bulb from a flashlight, a finger-type battery and 2 pieces of wire. The entire electronic circuit of the control device is alternately connected parts. Connect the battery with one end of the LED, in other words light bulbs, connect wires to the free ends of the LED and the battery. You will get a universal device for checking the integrity of electronic circuits.

Relevant malfunctions of the Makita 2450 and 2470 rotary hammer Common faults in the electronic part of the Makita 2450 and Makita 2470 rotary hammer:

fracture of the supply cable at the entrance to the perforator;
breakdown of the TG813TLB-1 switch button, art.650508-0, pos. 68.;
wear of electronic carbon brushes SV-419, art.191962-4, pos.65;
wear of reverse switch contacts;
wear of rotor bearings: bearing 609LLU, art.210060-6, item 51; bearing 607LLU, art.211021-9, item 56;
short rotor closure 220-240 V, art. 515668-8, item 54;
breakdown of the stator winding 220-240 V for HR2450, art.633488-5, pos. 59.

For the start button, the switch TG813TLB-1, art.650508-0; pos. 68.

Substitution of the brushes is done with their complete abrasion or bad contact. This malfunction is found by strong heating of the points where the electric brushes are installed.

The failure to turn on the punch you like more is caused by the abrasion of the contacts on the reverse switch. This malfunction is eliminated to pain simply.

Makita rotary hammer reverser repair

When repairing the reverse switch, the back cover must be disconnected. Carefully disconnect the wires from the button. Look closely at the switch.

The upcoming disassembly consists in removing the brush holder, after having previously released the brushes themselves. Removing the brush holder, you will get to the contacts of the reverse switch.

Determine its condition, if necessary, change the contacts.

Additional, often encountered electronic malfunction, bad contact between the stator and the lower contacts of the reverse switch.

Repair contact between stator and reverse switch

To remove the stator, you need to disconnect the gear housing (dark color) from the stator housing (greenish color).

Remember! In the mechanical part of the rotor, the bearing is pressed by a special ring. When disassembling, do not lose it.

The stator is located in the greenish case. Having visited the middle, you will see two self-tapping screws 4 × 60, art. 266334-3, pos. 57, securing the stator to the housing. Unscrew them, remove the plastic protection of the stator for HR2450, art. 419201-3, pos. 58., Release the stator. When you get the stator, you will see the contacts on the stator and the reverse switch panel.

Carefully clean the contacts with sandpaper, treat with solvent or alcohol.

Before assembly, bend the contacts so that they fit tightly into each other. Lubricate the contacts with a technical Vaseline in a thin layer.

The assembly of the electronic part of the punch is done in reverse order.

Makita 2450 rotary hammer disassembly instruction

A hammer drill is a percussion drilling tool that immediately performs the function of percussion and drilling equipment while working with particularly strong materials.

The device used two ideas at once: the tool spins and moves longitudinally, transmitting the impulse of impact to a solid surface.

Hammers always operate in extreme environments with the highest degree of dust.

The uptime is affected not so much by the operating conditions, but by the quality of the components included in the tool.

Makita 2450, 2470 rotary hammers are reliable tools of high-quality work. Even the most reliable tool requires proper care and timely maintenance.

To perform maintenance on Makita 2450, 2470 rotary hammers, you must certainly become familiar with the internal contents of the tools that make up the components. A real annotation will help you find out the weak spots of a Makita punch.

To carry out repairs of the Makita 2450, 2470 rotary hammer in artisanal conditions, a person with locksmithing capabilities and knowledge of electrical engineering is allowed.

Remember! Carrying out repair of the puncher it is necessary to observe safety measures during the work with electric devices.

Makita 2450 and 2470 rotary hammers are assembled practically according to a similar scheme and, in fact, from similar, interchangeable parts. Repairing them is no different.

Type of punch Makita 2450

For ease of repair, the assembly diagram and catalog of parts for Makita rotary hammers are given below.

Makita 2450 rotary hammer assembly diagram

The device of Makita 2450 and 2470 punchers

The Makita punch conditionally consists of electronic and mechanical parts. At the same time, the mechanical assembly of the punch is located in a dark plastic case, and the electronic part of the punch is hidden under a greenish plastic case.

The procedure for disassembling the mechanical part of the punch

The mechanical assembly is designed to transmit the rotational moment of the shaft to the tool, creating not so much torque and translational shock impulse.

The task of the mechanical assembly is to transmit rotation from the rotor to the tool, while simultaneously providing the tool with longitudinal movement.

Disassembly of the punch begins with the removal of the quick-detachable cartridge.

Quick Release Chuck Parts

Having disassembled the cartridge, remove the four screws, pos. 10, securing the cover of the gearbox case, pos. 14 of the mechanical unit and the perforator body, and pressing the end of the perforator shaft, remove the black plastic cover.

Remove the cover of the mechanical unit

To remove the mechanical block from the greenish stator housing, you need to:

1. Unscrew the three screws pos.70,75,76 holding the cover pos.69 in the handle of the punch;

3. After releasing the springs of the brush holders pos.63.66, remove the carbon brushes pos.65.

Now you can pull out the mechanical block from the stator housing.

Type of mechanical block

Having released the mechanical block, it is necessary to disconnect the rotor from it. Rotor pos. fastened in the mechanical block by friction of the teeth of the gears and pulled out by staggering and disconnecting immediately.

Dismantling the mechanical block of the shock assembly

The mechanical assembly is assembled on the inner case, item 49. To remove the intermediate shaft, unscrew the two screws pos. 43 at the base of the housing. Another intermediate shaft is fixed by the lever of the mode switch.

Two words about the mode switch

In Makita 2450, 2470 rotary hammers the lever which provides the tool with three operating modes is installed. The hammer drill can simply drill, simply hammer, and hammer while drilling. The switch lever is worn on the axis of the inner case and is fixed with a compression spring pos. 85, a washer pos. 87 and a lock ring pos. 86.

It’s time to remove the intermediate shaft.

Disassembly intermediate shaft

To disassemble the countershaft, use the diagram provided with the true annotation.

Photo of the circuit of the intermediate shaft indicating the disassembly order

From the shaft pos. 40, remove everything in order:

a). bearing pos. 46 and ring pos. 47;
b) spur gear pos. 42;
in). rolling bearing pos.41;

Do it yourself repair of the Makita HR 2450 rotary hammer gearbox. most comprehensive review

I got to my own punch makita HR 2450, who has lost a hit is at its peak. Inner strike are found, and to the peak.

Dismantling the Makita HR 2450 rotary hammer

This Video. 1st part of the repair process punch Makita HR 2450 by yourself.

And today, remove the shaft:

d). flat washer 12 pos. 35;
e). bearing 606 pos.36;
e). snap ring S-7 pos 37;
g). compression spring 7 pos. 38;
h). clutch pos. 39.

The procedure for disassembling the shaft of the barrel of the percussion mechanism

To disassemble the shaft of the percussion mechanism, you need to remove it from the inner housing.

From the shaft, you need to remove the cylinder pos. 32, inserted into the internal cavity of the shaft.

The cylinder is very easy to understand:

1. With its use, you need to get the drummer pos. 30;

4.5. The piston hinge pos.34 is knocked out;

3. Two flat washers pos.33.35 are removed.

To disassemble the shaft itself pos. 21 of the shock mechanism, it is necessary to remove the unfamiliar shaft of the cartridge installation:

– annular spring 28 pos.16;
– the puck 30 pos.17;
– compression spring 31 pos. 18;
– spur gear 51 pos.19;
– metal ball 7.0 pos. 20.

And do not know the familiar internal cavity of the shaft:

– annular spring 28 pos. 29;
– rubber ring pos. 28;
– iron ring pos. 27;
– rubber ring 15 pos. 26;
– ring 9 pos. 25;
– flat iron washer 28 pos. 22.

Disassembled shaft shaft

Disassembly of the electronic part of the punch Makita 2450, 2470

The electronic part of the Makita 2450.2470 rotary hammer includes:

TG813TLB-1 switch pos. 68;

carbon brushes SV-419 pos.65;

brush holder pos.63.66.

To remove the stator, it is enough to knock on the end of the plastic greenish case of the stator unfamiliar with a wooden mallet on another bar.

But first, you need to unscrew the two self-tapping screws 4 × 60 mm pos. 57.

With frequent tapping on the housing, the stator spontaneously protrudes beyond the edges of the housing, and then is removed by hand.

Other elements of the electronic part of the Makita 2450 or 2470 rotary hammer are simply dismantled, since they are not fastened with anything.

Disassembly of the punch is completed.

Makita 2450 rotary hammer disassembled

How to grease and assemble the Makita 2450 and 2470 rotary hammer correctly

The assembly of any mechanism should be started after painstaking preparation. It is necessary to prepare not only parts, but also tools, a place, a lubricant.

Of the tools can not do without pliers, screwdrivers, a hammer, a brush for applying lubricant.

But what is the assembly scheme of the Makita 2450 and 2470 rotary hammer?

The assembly of the Makita punch you yourself will like is performed only on the terms of observing the attached annotation.

The task of the assembly process is to replace the parts that have fallen out of their order with suitable ones and to ensure interchangeability and operability of the tool.

Assembly order for Makita 2450 rotary hammer

Shock assembly

How to assemble the hammer mechanism of a Makita punch? The shock mechanism is assembled from 2 nodes: a shaft 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 a compression spring pos. 18. For fixing, the spring is pressed by the washer 30 pos.17 and secured by the circlip 28 pos.16.

B) To assemble the striker, put on the ring 9 pos. 25 on the striker shaft, tighten the rubber ring pos. 26, and press it with the iron ring pos. 27.

Now we run to the back of the barrel pos.21. At the same time, the inner surface of the barrel must be lubricated with grease and stick the assembled hammer pos. 24 inward.

Assembling the intermediate shaft and piston

Intermediate shaft assembly

For assembly countershaft you need to put the rolling bearing pos. 41 on the shaft pos. 40 with teeth to the splines of the shaft, put on the splines of the shaft coupling pos. 39.

Translational motion

On the reverse side of the shaft, a helical gear 26 pos. 42., A flat washer 8 pos. 45, a bearing 608zz pos. 46 and a snap ring 8 pos. 47 are put on. The intermediate shaft is assembled.

Gearbox Assembly

The gear unit produced is done on the inner case, pos. 49.

When, there are cases when the axles pop out of the inner duralumin housing. Both axles are pressed into the housing.

In the housing, item 49, the assembled intermediate shaft is inserted, the lever of the rolling bearing of which must fall into the hole of the cylinder hinge.

Video: How To Assemble A Makita 2450 Hammer Video

With all this, the lever of the rolling bearing pos.41 of the intermediate shaft must fall into the hinge of the cylinder pos.32, and the lower bearing of the intermediate shaft in the socket in the housing. This function is usually done by swaying the structure until the parts completely reach the designated places.

Setting the mode lever

The mode switch is designed to translate the clutch pos.39 in different positions and transmit translational motion to the shaft of the shock mechanism through the rolling bearing pos.41 to the cylinder pos.32.

Assembly of the lever of the switch of the regimes of the puncher of Makita 2450

On the axis of the inner case, put on the lever of the mode switch pos. 82, pressurizing spring, pos. 88 from above, and press down with a flat washer pos. 87. Install the snap ring pos. 86. and fix.

The snap ring must be painstakingly fixed. Turning the intermediate shaft, you need to carefully check the correct operation and free movement of the cylinder in the housing. This needs to be done at the moment, so that it is not clear at the end of the assembly that the assembly was not assembled correctly.

Assembly of the shaft of the percussion mechanism

First you need to lubricate the inside of the cylinder pos. 32 and stick the drummer pos. 30 there.

It remains to put the oiled barrel assembly in pos. 49 into the inner case pos. 21 to the area, putting it on the oiled cylinder pos. 32. For lubricants, it is recommended to use a special grease designed for Makita rotary hammers.

Lubricants are available in several types: Makita P-08361 and Makita 183477-5 SDS-PLUS.

Makita 183477-5 SDS-PLUS grease is recommended for the gearbox. For drill shanks, Makita 196804-7 brand grease is used.

Lubricants vary in color, but have completely similar features. In addition, what lubricants are used in the Makita 2450 and 2470 rotary hammer?

And before us is the assembled mechanical unit.

Video of the general disassembly and assembly of the Makita 2450 rotary hammer

Check its performance by rotating the countershaft and controlling the movement of the piston in the percussion mechanism. Our customer is left!

Now we lubricate what remains to make our client parts of the mechanical block the recommended lubricant. Here is a good example of the correct application of grease on rotating surfaces. But another example of a generous lubrication of a mechanical unit.

Do not spoil the porridge with oil

So it is also allowed to apply grease. Do not spoil the porridge with butter!

The lubricated mechanical unit must always be closed with a plastic case, item 14, in dark color. With the casing on top of the assembly, press the casing down to workable>> version of fixing the node in the personal computer. Backwardness Insert four bolts of pos. 10 into the housing and tighten.

Now it’s the turn of joining the mechanical part of the rotor of the electric motor. Rotor installation

The helical gear of the rotor is firmly inserted into the body of the mechanical unit and pressed.

It remains to insert four self-tapping screws m4 × 60 pos. 57. and screw them into the body of the electrical unit.

Installation of electric brushes

Remove the dirt from the grooves of the brush holder and set the brushes to the area, securing them with latches.

Now it’s time to check the performance of the punch. Connect the punch plug to the outlet, turn on the punch for a short time while working in the "drilling" mode. After making sure that the tool is working, turn it off. Set the mode switch to the “punch” position. Do not stick the tool. Check the performance of the rotary hammer in this position. At the same time, you checked the operation of the mode switch.

It remains to check the installation of the speed controller button, to make sure the contact connections are reliable, you can proceed with the installation of the costly cover.

The cover is fastened with 3 self-tapping screws M × 4 of different lengths.

Connect the rotary hammer to the 220Β network and check in all modes. The Makita 2450 puncher in other words 2470 is assembled and works properly!

How to repair the cartridge and percussion mechanism of the makita 2470 hammer drill barrel

Due to the ingress of dust, dirt and water, the internal lubricant becomes tough over time and does not even make its own purpose. The punch starts to work with third-party noise. When starting to repair a punch, be sure to read the attached annotation for disassembling, lubricating, and assembling the components of the Makita 2450, 2470 punch. The layout of the Makita 2450 and 2470 punch will help you correctly disassemble the failed parts and find the defective parts. In addition, we will tell you how to disassemble a Makita punch 2450.

Punch disassembly Makita 2470 begins by removing the mode dial.

Punch disassembly procedure

Place the hammer drill on a clean surface.

When disassembling the mechanical part of a Makita 2450 or Makita 2470 rotary hammer, you must always remove the mode selector knob.

At the beginning of operation, the handle is set to the “Impact” mode (extreme right position clockwise). On the handle, using a screwdriver, poke and release the latch. After removing the latch, the handle is moved to the leftmost position, in the "Drilling" mode.

The handle clamped with fingers is removed from the grooves of the housing.

Video instruction for disassembling the Makita 2450 punch mode selector knob

Video: How to put How to remove the mode switch on a Makita HR 2450 rotary hammer

How to set the mode knob

To install the mode switch in the case, you need to perform some actions: insert the switch into the “drilling” position in the seat slot until it clicks; turn the switch counterclockwise to the “strike” position; move the switch with a click counterclockwise to the “drilling” position; insert the spring and the red button; insert the cover on top until it locks in place.

The mode switch is assembled.

At the second stage, you should disassemble the quick-detachable cartridge and repair the punch cartridge with your own hands. By the way, the cartridge needs to be disassembled only on models of the Makita 2470. The cartridge device is quite simple, and any person with a little knowledge of locksmithing skills can cope with its repair.

Makita rotary hammer disassembly procedure

Using a screwdriver or puller, the boot is removed, the cartridge is released from the retaining ring, clutch cover, metal ring 20 pos. 4. Next, you need to carefully get the ball pos.20, remove the guide washer pos.5 and the conical spring pos.6 that supports it. The cartridge is disassembled.

The diagram below shows the design of the perforator cartridge.

The main malfunctions of the makita 2450 punch, causing defects in the operation of the chuck, are:

wear of a protective rubber boot pos.1;
relaxation of the retaining ring pos. 2 or its partial wear;
ball wear pos.20;
loss of elasticity of a conical spring pos.6 or its tension.

Repairing a perforator cartridge is not a complicated procedure and is usually easy to carry out by anyone who can hold a screwdriver in their hands.

The grease has an index of Makita P-08361, Makita 183477-5 SDS-PLUS 30 g for the gearbox. Makarov 196804-7 grease is recommended for drill shanks.

When assembling the cartridge, install the conical spring with the narrow side facing the punch. Do not forget, do-it-yourself cartridge repair requires careful attention from the collector.

Assembly procedure for quick release chuck

Assembly is carried out on a clean surface. Parts are pre-washed, dried and greased with a thin layer of recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. On the shaft in a certain sequence, all incoming parts of the cartridge are collected.

After installing the conical spring, pos.6, put on the guide washer pos.5 and fix it with the ball pos.20, inserting it into the groove of the gearbox shaft.

It remains to put on the ring pos. 4, the casing of the coupling pos. 3, fix the parts with the locking ring pos. 2. At the last stage, insert the protective tip pos. 1 into the end face of the cartridge, the repair of the cartridge of the Makita 2450 punch is completed. It remains to check its quality by inserting a drill into the cartridge. With proper assembly, the cartridge holds the drill from spontaneous loss.

Disassemble the gearbox

To get to the mechanical part, you will need to remove the plastic case.

The procedure for dismantling the mechanical part of the Makita rock drill. First, the protective plastic case in black is removed. The case is removed after you unscrew the four screws securing the case from the end. By pushing on the shaft end you squeeze the gearbox out of the housing.

After removing the housing, it is necessary to separate the rotor from the gearbox. A reducer is a general mechanical part. The rotor is separated from the mechanical part (gear) simply. With your right hand you need to hold the gearbox, hold the rotor with your left. Swinging, pull both sides in opposite directions. The rotor is held in the gearbox due to the friction of helical gears.

The main malfunctions of the Makita rotary hammer occur in the mechanical part of the tool.

The most characteristic malfunction for the mechanical part, the failure of the shock mechanism.

Dismantling the impact mechanism The impact mechanism is assembled on the inner casing and consists of a gear shaft and an intermediate shaft. Rotational motion is transmitted through helical gears to the countershaft.

Gearbox shaft is hollow trunk, in which the cylinder moves freely.

A small spur gear mounted on an intermediate shaft transmits rotation to a large spur gear of the gearbox shaft in which the percussion mechanism is mounted. And the translational movements on the gearbox shaft of the shock mechanism are simultaneously transmitted due to the transfer from the rolling bearing of the intermediate shaft to the cylinder moving in the gearbox barrel.

We proceed to disassemble the intermediate shaft.

Disassembly countershaft

On the shaft pos. 40, a helical gear pos. 42 is mounted, on which rotation is transmitted from the rotor gear, a rolling bearing 608zz pos. 41, which transmits translational motion to the joint pos. 34 of the piston pos. 32. On the other side of the shaft, a clutch pos. 39, a spur gear 10 pos. 80, a compression spring pos. 38, a snap ring S-7 pos. 37, a bearing 606zz pos. 36 are used. Special attention should be paid to the condition of the rolling bearings. The punch has imported bearings. Allowed the installation of domestic bearings.

Bearing 606zz can be replaced with 80016, bearing 609zz is changed to 80019.

We proceed to disassemble the shaft of the shock mechanic

Dismantling the shaft of the percussion mechanism Dismantling the barrel of the Makita 2470 punch is a simple process using the Makita punch design. The shaft is a barrel pos.21, in which the shock mechanism is assembled. A gear pos.19 is attached to the barrel, which is pressed by the spring pos.18, through the washer pos.17 and fixed by the locking ring pos.16.

The cylinder pos. 32 moves in the barrel, acting on the striker pos24. On the reverse side of the striker is fixed a metal ring pos. 27, transmitting the blow to the drill.

And when do you need to replace the barrel of a punch?

Most often, a metal ring fails.

Drum cylinder

With the disassembly, we figured it out. We change the parts to serviceable and are preparing to assemble. Learn more about grease and punch assembly.

Read if there are problems with the electric part of the punch.

Makita rotary hammer quick release video

Video: how to disassemble the makita HR2450 puncher in 5 minutes to the smallest detail

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 for use, is lightweight and comfortable while working.

The design provides a special protective system designed to limit the spread of dust. With timely cleaning, the tool will work efficiently throughout its entire service life.

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

The manufacturer presents the following specifications:

Total weight. 2.04 kg
SDS system allows you to mount drills
You can hammer and drill
The system has three modes of operation
The largest number of beats per minute. 4500
Translational Strength. 2.7 Joules
The power supply network is 780 watts.

Why is a Makita puncher undesirable to hammer?

Often the equipment fails, and the drill flies out of the punch. This happens for various reasons. Many users of Makita rotary hammers are faced with the fact that their device does not hit, but drills at the same time. You can fix the breakdown yourself. The most common causes of malfunctions are presented below:

Countershaft wear
Deformation of clamping units
Damage to the connecting rod system
Lack of lubrication for proper operation
Damage to shock components

Makita rotary hammer: DIY repair

Diagnostic and troubleshooting technology are identical to other devices. To begin with, you should disassemble the tool by removing the case, and then remove obsolete grease and dirt.

Nodes that have stopped working are recommended to be replaced. After that, all the constituent elements of the mechanism are set to their original position.

For correct operation, it is recommended that you carefully examine each repair point. To restore the functionality of the cartridge 2010, the mode switch and the housing, the following steps should be performed:

Remove cartridge
Remove switch
Repair defects in the inside of the case
Lubricate and replace worn parts.

How to disassemble a puncher and gearbox?

When disassembling the gearbox, it is recommended to adhere to the following instructions:

Install the hammer drill on a hard surface by lifting its barrel up
Pull the shell with forward movements, pressing the tool to the table. This position prevents accidental displacement of the constituent elements.

Makita rotary hammer assembly

After the repair is completed, all the removed parts should be returned to their original position. It is recommended that a fresh coat of grease be applied to all necessary parts.

Before assembling, the body is cleaned with kerosene or gasoline. The peeled shell is returned to the place. The mode switch must not be in it.

Circuit diagram Makita HR 2450

The Makita-2450 rotary hammer system consists of many complementary components and a list of spare parts. Among the most significant elements, the features of which should be taken into account during repair work, the following stand out:

Ring locking device. It is designed to hold the spherical element fixing the drill. The washer and spring guide it
Snap ring It is necessary for the correct removal of the cartridge cover
Four screws connect the gearbox and motor, eliminating vibration. The circuit has a large number of rubber components. Often they cause a malfunction.

Descriptions of the mentioned nodes will be enough for a quality repair.

Conclusion

Makita rotary hammers by right are one of the best in the modern market. The 2470 is a bit improved, but that doesn’t make the device durable. Timely repairs will maximize the period of correct operation. This article helps to understand the features of the work of the main nodes. To eliminate the most common types of malfunctions, these materials are enough.

Punch disassembly procedure

Place the hammer drill on a clean surface.

When disassembling the mechanical part of a Makita 2450 or Makita 2470 rotary hammer, you must always remove the mode selector knob.

At the beginning of operation, the handle is set to the “Impact” mode (extreme right position clockwise).
On the handle, using a screwdriver, poke and release the latch.
After removing the latch, the handle is moved to the extreme left position, in the "Drilling" mode. The handle pressed with fingers is removed from the grooves of the case.

Video instruction for disassembling the Makita 2450 punch mode selector knob

How to set the mode knob

To install the mode switch in the case, you need to perform some actions:
insert the switch into the “drilling” position in the seat slot until it clicks;
turn the switch counterclockwise to the “strike” position;
move the switch with a click counterclockwise to the “drilling” position;
insert the spring and the red button;
insert the cover on top until it locks in place.
The mode switch is assembled.

Makita rotary hammer disassembly procedure

Repair of the perforator cartridge begins with the installation of the perforator vertically on the rear housing cover. The hrMakita hammer drill circuit will help you properly disassemble.
Is a Makita 2470 rotary hammer cartridge replacement needed? The answer can be obtained only after a complete disassembly of the cartridge with your own hands.
Using a screwdriver or puller, the boot is removed, the cartridge is released from the retaining ring, clutch cover, metal ring 20 pos. 4. Next, you need to carefully get the ball pos.20, remove the guide washer pos.5 and the conical spring pos.6 that supports it. The cartridge is disassembled.

The diagram below shows the design of the perforator cartridge.

The main malfunctions of the makita 2450 punch, causing defects in the operation of the chuck, are:

wear of a protective rubber boot pos.1;
relaxation of the retaining ring pos. 2 or its partial wear;
ball wear pos.20;
loss of elasticity of a conical spring pos.6 or its tension.

Repairing a perforator cartridge is not a complicated procedure and is usually easy to carry out by anyone who can hold a screwdriver in their hands.

If replacing a rubber boot, retaining ring, conical spring is not difficult, then replacing a new ball requires attention. The new ball must have a diameter of 7 mm ± 1 μm.
As lubricants, it is recommended to use a special grease developed for the Makita rotary hammer.
The grease has an index of Makita P-08361, Makita 183477-5 SDS-PLUS 30 g for the gearbox. Makarov 196804-7 grease is recommended for drill shanks.

When assembling the cartridge, install the conical spring with the narrow side facing the punch.
Do not forget, do-it-yourself cartridge repair requires careful attention from the collector.

Assembly procedure for quick release chuck

Assembly is carried out on a clean surface. Parts are pre-washed, dried and greased with a thin layer of recommended grease.

The gearbox shaft is lubricated with Makita 183477-5 SDS-PLUS grease. All incoming cartridge parts are assembled on the shaft in a certain sequence. After installing the conical spring pos.6, put on the guide washer pos.5 and fix it with the ball pos.20, inserting 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 face of the cartridge
The Makita 2450 rotary hammer cartridge repair is now complete. It remains to check its quality by inserting a drill into the cartridge. With proper assembly, the cartridge holds the drill from spontaneous loss.
Cartridge assembled.

Disassemble the gearbox

To get to the mechanical part, you will need to remove the plastic case.

The procedure for dismantling the mechanical part of the Makita rotary hammer
The protective black plastic case is first removed. The case is removed after you unscrew the four screws securing the case from the end.
By pushing on the shaft end you squeeze the gearbox out of the housing.

After removing the housing, it is necessary to separate the rotor from the gearbox. A reducer is a general mechanical part.
The rotor is separated from the mechanical part (gear) simply.
With your right hand you need to hold the gearbox, hold the rotor with your left.
Swinging, pull both sides in opposite directions. The rotor is held in the gearbox due to the friction of helical gears.
The main malfunctions of the Makita rotary hammer occur in the mechanical part of the tool.

The most characteristic malfunction for the mechanical part, the failure of the shock mechanism.

Dismantling the hammer
The shock mechanism is assembled on the inner case and consists of a gear shaft and an intermediate shaft.
Rotational motion is transmitted through helical gears to the countershaft.

The gear shaft is a hollow barrel in which the cylinder moves freely.

A small spur gear mounted on an intermediate shaft transmits rotation to a large spur gear of the gearbox shaft in which the percussion mechanism is mounted.
And the translational movements on the gearbox shaft of the shock mechanism are simultaneously transmitted due to the transfer from the rolling bearing of the intermediate shaft to the cylinder moving in the gearbox barrel.

We proceed to disassemble the intermediate shaft.

Dismantling the countershaft

On the shaft pos. 40, a helical gear pos. 42 is mounted, on which rotation is transmitted from the rotor gear, a rolling bearing 608zz pos. 41, which transmits translational motion to the joint pos. 34 of the piston pos. 32.
On the other side of the shaft, a clutch pos.39, spur gear 10 pos.80, compression spring pos.38, snap ring S-7 pos.37, bearing 606zz pos.36
Particular attention should be paid to the condition of the rolling bearings.
The punch has imported bearings. Allowed the installation of domestic bearings.
Bearing 606zz can be replaced with 80016, bearing 609zz is changed to 80019.

We proceed to disassemble the shaft of the shock mechanic

Dismantling the shock shaftDismantling the barrel of a Makita 2470 rotary hammer is a simple process using the Makita rotary hammer design.
The shaft is a barrel pos.21, in which the shock mechanism is assembled.
A gear pos.19 is attached to the barrel, which is pressed by the spring pos.18, through the washer pos.17 and fixed by the locking ring pos.16. The cylinder pos.32 moves in the barrel, acting on the striker pos24. On the reverse side of the striker is fixed a metal ring pos. 27, transmitting the blow to the drill.
And when do you need to replace the barrel of a punch?

The most common failure is a metal ring.

With the disassembly, we figured it out.
We change the parts to serviceable and are preparing to assemble. Learn more about grease and punch assembly.

Read if there are problems with the electric part of the punch.

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