How to disassemble the battery from a Makita electric screwdriver

General information

Design of a Makita electric electric screwdriver

The Makita electric screwdriver is a fairly simple design that consists of several main parts:

In certain models, additional devices may be added, but the main components will always be the same. The battery is a fully disconnected part, which will be recharged from time to time at a specialized station. It is seldom considered as a direct instrumental component. But it is the battery that quite often fails. The inside of a device such as a Makita electric screwdriver is quite simple.

From where the battery is connected, the wires will go to the speed switch, and also the start button itself, from which the contacts will go to the electric motor. It is inserted with its front part inside the gearbox, which consists of a whole set of gears with different configurations. The composition of the set will depend only on the number of speeds or the operating modes of the electric screwdriver. The modes will be switched by a specialized controller, which is taken outside.

The gears in the gearbox with the outer cogs work in close connection directly with the housing, which has cogs on the inside. And while the cogs in certain parts are made of metal, the plastic housing itself will include plastic cogs. It is not surprising that after a while this design will begin to wear out and will fail.

How to disassemble a Makita electric screwdriver

In order to perform the disassembly of an electric screwdriver, it is required first of all to disconnect the battery. After that, the tools in the housing will unscrew all the screws that can hold the pair of halves together. After that, you should remove the housing, and then all the components from the outside will be opened in front of the master. the electric motor, switch and gearbox. Another thing to note is the fact that in these models, quite often installed specialized plates that are responsible for switching between modes. If you don’t disassemble it very carefully, you might not notice the small plate. After disassembly, you can immediately begin repair work for the appropriate part.

How to disassemble the battery of a Makita 12-volt electric screwdriver, bonded with glue

The adhesive seam should be particularly carefully detached to prevent cracks and splits in the plastic, and when they are assembled, the housing completely covers all electronic parts and provides security. To do this, it is rational to use a rubber mallet, or other mallet made of soft material.

All around the perimeter of the seam, strikes, applying moderate force, ensuring that the gun bounces off the body a little. The procedure is not short-lived, taking at least 10 minutes. And more needs to be done without rushing. Along the way, the body halves are periodically pulled slightly away from each other, helping them separate. The layer of glue collapses with a characteristic sound, when the specific click becomes more frequent, you can help separate with a thin blade of a knife or similar tool, trying to open the seam with it.

Another way to gently undo the glued module with a thin knife, flat screwdriver. It takes a little longer, the work must be done carefully, as the risk of injury and plastic fractures is very high. Use a blade to gently loosen the seam around the perimeter, then insert the tip of the screwdriver into it and slowly separate the halves of the module.

Makita 12 volt screwdriver, you can warm the adhesive layer with a construction hair dryer, which will speed up and facilitate the work. Placing the battery module at a safe distance, the hot stream is directed to the joint, warming it all around. When the adhesive softens, the case is easy to open.

Important: The gloves used during work will help avoid burns.

How to disassemble a Makita electric screwdriver

In order to disassemble an electric Makita screwdriver, you must first disconnect the battery. Then all the screws that hold the two halves together are unscrewed in the body of the tool. After that, the housing is removed, and all the external components are exposed to the master: the motor, the gearbox and the switch. It is also worth noting that these models often have special plates that are responsible for switching modes. If you don’t disassemble it carefully, you won’t notice a small plate. After disassembly, you can immediately begin to repair the relevant part.

How to disassemble a Makita electric screwdriver

In order to disassemble an electric Makita screwdriver, you must first disconnect the battery. Then all the screws that hold the two halves together are unscrewed in the body of the tool. After that, the housing is removed, and all the external components are exposed to the craftsman: the motor, the gearbox and the switch. It is also worth noting that these models often have special plates that are responsible for switching modes. With not the most attentive disassembly, a small plate can simply not be seen. After disassembly you can immediately begin to repair the relevant part.

Repairing the Battery of a Makita Electric Screwdriver

Everyone knows that the battery of an electric screwdriver sooner or later begins to lose its former performance and needs to replace the batteries. Usually “sits down” only a couple of elements in the general bundle, but it has a negative impact on the entire battery.

Therefore, there is a need to either replace a few elements with new ones, or still replace the battery pack completely. Since any electric screwdriver. “Hitachi”, “Makita” and other models. includes two batteries, if you want you can try to build a whole homemade battery from two.

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Owners of power tools, who use them constantly, sooner or later begin to wonder how to convert the battery of an electric screwdriver to lithium.

As for the newcomers, firstly they have a question about how to disassemble the battery from the electric screwdriver “Makita” or any other, so as not to damage the fragile plastic box.

Experienced electronics enthusiasts assemble different types of batteries, including power supplies for uninterruptible power supplies (UPS). It is much harder than taking apart the battery of an electric drill.

Makita 6722

Any drill is often produced with so-called “non-disassembled” battery packs, which are either firmly taped around the perimeter, or their two parts are so tightly fitted to each other that they are, at first glance, impossible to disconnect without causing forced external damage.

However, among the craftsmen you can find those people who have already thoroughly “practiced” on such batteries and can gladly share their secrets with all comers.

How to disassemble a battery with a regular mallet

To disassemble the battery from a Bosch electric screwdriver, Metabo, or any other tool for 12 volts or more, you need to put some effort. If you just pry open the edges of the battery pack with a screwdriver, it will be messy. In addition, there is a greater risk that the fragile plastic construction will simply break.

Therefore it is recommended to take a mallet and begin to tap slowly on the edge of the seam until the characteristic sounds occur, meaning that the seam itself begins to loosen slowly.

Tapping will take a long time, and it will take time and patience.

But this is the way to ensure that the disassembly of the battery from an electric screwdriverMakita” will be successful, without unnecessary damage and losses.

After a while you will hear the crackle of the seam breaking. The batteries themselves inside will not be damaged by this manipulation. Only the seam that holds the block together will break, but the “cans” and the two halves of the plastic housing will remain intact.

When disassembling the unit, tap the case lightly with the mallet, without applying much force, so that it slightly bounces from the surface. From time to time between taps you can try to slowly pull off the bottom cover of the unit, thus checking how far the seam has loosened. In such cases the mallet itself will be slightly damaged, but there is nothing bad in it.

Makita battery. Bring dead battery back to life. Easy and simple steps.

When the clicking noises become regular, you should check the block with some small knife, carefully inserting it between the body halves. When the two parts of the body start to come apart, you will see it. it means that we are almost there.

It is worth warning right away that the 12-volt Makita electric screwdriver battery packs are often surprisingly strong and difficult to disassemble. But if you work little by little with the mallet, the seam on the glue will gradually start to crumble. It can take ten minutes or more to disassemble. But for a person with experience, the whole process takes no more than six minutes.

That is how, gradually and carefully, you can disassemble the battery of an electric screwdriver, which the manufacturer deliberately made “non-removable”. in order not to change the batteries in it, and immediately run to get a new one, which is expensive. Of course, this requires a certain amount of skill and care. But it will save money, and at the same time learn how to disassemble the battery from an electric screwdriver “Makita” with their own hands.

Disassembling the battery with a spatula or a paper knife

For those who are not used to working with a mallet and want to make the battery disassembly process look quieter and gentler, you can use a small metal spatula or a paper knife. The main thing is that they have no sharp edges, like a large screwdriver, which can easily damage the plastic.

First you should go all the way around the perimeter of the whole block with a knife to loosen the seam, and only then a small screwdriver can begin to “pry” the flexible plastic.

The method is no less painstaking than the first, and if a person is not experienced enough, damage can remain on the plastic case.

However, if you work as carefully as possible, it is possible to avoid “losses” in this case as well.

If when disassembling the battery pack you do have cracks or other damage, do not get upset, because this type of plastic can be perfectly glued with dichloroethane.

How to assemble one battery from two

It happens that the best way out of a situation where the “sat” both batteries, is the way to assemble one complete battery of two. Using any of the suggested methods, you can disassemble the two blocks to see which elements are suitable for further use and which should be discarded.

  • two batteries;
  • charger;
  • Any thin and flat screwdriver;
  • a scalpel;
  • a piece of sandpaper;
  • two wires;
  • a load resistor (two can be used);
  • Voltmeter for voltage measurements.

Charging the batteries

Before disassembling the blocks, they must be well charged. At the following voltage measurements it will allow to understand which batteries are “alive” and which are not. Before charging the batteries, it is advisable to clean the internal contacts of the charger with sandpaper, because any transient resistance can “give off” an incorrect charging process.

When you charge both batteries alternately, pay attention to the rate at which they charge.

disassemble, battery, makita, electric, screwdriver

If the battery charges quickly and the charge indicator signals the end of the process after only a few minutes, it means that there are definitely faulty cells in the battery.

And of course when the battery is charging too slowly or not drawing any current at all, you should definitely take it apart and “test” all of the batteries that are inside. Read more about electric screwdriver battery charging time →

After you charge and disassemble your battery pack, you’ll see that there are several cells. the cans. inside it. Their number can be different, depending on the voltage level of your tool. The banks are connected in a certain series. Inside, there is a temperature sensor, led to the contact plates.

If the signal from the temperature sensor going to the charger is not correct, then the battery will either be undercharged or overcharged. Both are extremely undesirable to the battery and will adversely affect its ability to function. This is why it is highly recommended that you clean the contacts before you charge both batteries.

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What is the load resistance for?

Let’s work with the load resistance. As mentioned above, you can take two, each with a rating of 1 ohm. If you put them both in parallel we get a total resistance of 0.5 Ohm. These ratings do not need to be strictly adhered to, but the lower the resistance, the better.

What is the role of load resistors in replacing the battery pack? If we take any electrical device and measure the voltage in its battery, we get a certain value.

disassemble, battery, makita, electric, screwdriver

However, this value will not tell you how well any particular battery can deliver its energy. If we measure the voltage under load, we will have what is called “voltage sag”.

This is your guide to how good or bad a battery is.

Load resistance in the form of two small metal bars and wires connected in parallel to each other, we connect carefully to a voltmeter. This method of loading is acceptable only if the output voltage of your battery is 12 volts or less (safe voltage level).

The wires are carefully fixed in the “sockets” of the voltmeter with the feeler gauges and the threshold of constant voltage of 20 volts is set on the voltmeter. This is enough to measure the U of the battery pack as a whole and, importantly, the U of each cell individually.

Measure the voltage

Before you measure the cell voltage, prepare a simple pencil with which you will record the U-value produced by each battery in the bundle. Since in most cases “popular” screwdrivers are equipped with nickel-cadmium batteries packed in thick layers of cardboard, it is important to take care that the batteries are accessible from both sides.

How to disassemble Makita electric battery drill

Now turn on your voltmeter (or multimeter) and measure.

When measuring each battery we make the exposure for five seconds and see if the voltage drops (usually it is about 1.2 volts for each battery individually).

Use a pencil to record the reading. Do not keep the probes on the batteries for a long time, because the resistance increases, and they can simply burn out.

Practice shows that if only one element of the whole bunch fails it negatively affects the performance of all the batteries. If the voltage of any “bank” is 1 volt or less, it has already exhausted its resource. To make sure of this check the self-discharge of each battery in the bundle.

Repeat the measurement after 15 minutes. When measuring be sure to check the primary and secondary U values. If it turns out that there are batteries which voltage after primary measurement has fallen sharply at repeated measurement. it means that their self-discharge is high and it is these cells that have finally worn out.

After the defective cells are “evaluated” disconnect them from the rest with a scalpel and put good batteries from the spare battery in their place. And so we remake the whole block, assembling from two full-value.

Solder the jars

Soldering should be done by spot welding, using an ordinary aspirin tablet. Soldering one cell directly to another is not permitted: any heating causes evaporation of the electrolyte and an increase in temperature that can be critical for the battery.

In disassembling the bond and soldering is important not to lose the metal particles, which may be indispensable when soldering elements to each other. To insure, you can take care in advance how to make blanks of spare plates of bendable metal. The important thing to remember is this: the better I solder, the better the battery will work.

Aspirin gives off a lot of caustic fumes, so you should work in a well-ventilated room. As a solder is taken a soft fusible composition, which has flowable properties. Solder is sprinkled with aspirin powder, so it flows between the plates and securely connects them, and aspirin helps to fix the compound in place.

The assembled battery is placed in the case, and the electric screwdriver is tested. If the tool works, reassemble the battery as usual and check it again for proper functioning.

If the tool does not have a drop in rpm, it means that the experiment was a success.

Since nickel-cadmium batteries when used properly work for a long time, there is a chance that the new bunch assembled by your own hands will not fail, and the battery for an electric screwdriver, made by your own hands, will work properly.

A little bit about how to convert the battery from cadmium to lithium and who needs it

Let’s talk about how to convert the battery itself from one type of battery to another. In the Internet there are a lot of videos on this subject, which very much says what the pluses are if the electric screwdriver is exactly lithium.

However, if you do not use the tool intensively and constantly, there is absolutely no point in a lithium battery.

Lithium-ion batteries tend to “age” more quickly than cadmium and simply will not have enough time to run out of battery life if you use the tool occasionally.

Rebuilding an electric screwdriver battery with lithium batteries may be necessary for professional craftsmen who use the tool daily and need a powerful source of power. Of course, if you want to, you can re-solder the battery to lithium, but whether it is worth it is up to you to decide. Read more about what batteries are better for an electric screwdriver →

Thus, it is possible not only to disassemble the battery of any electric screwdriver, but also to solder from two bundles one, which will serve as long as possible, and you will not have to buy a new battery in the near future.

The performance of the converted battery with properly soldered elements will not be any worse. The main thing. treat the process with patience and maximum care, so that the first experience to finish the job with minimal losses and solder everything correctly.

If it all works out, it’s an extra incentive to keep going with your experiments in electronics. Assemble the battery yourself once and you can save on buying new batteries for your electric screwdriver in the future.

Step 3 Replacing the control board.

The control board came with good installation instructions, but they don’t explain everything, this may be because it can be used with all models of the 18-volt LXT battery made by Makita. If you have a little common sense, you should be fine.

So, in addition to soldering, you can expect that you will also have to cut a lot of plastic, and that assumes that you are as lucky as I am and do not need to replace any cells. If you are spot welding with cells, this is the best way to go, since if you solder, you run the risk of overheating.

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As I previously removed the battery pack from the case, the first thing to do is to remove the existing circuit board and cut off the plastic pad for the board and t. Д. According to the instructions. I decided to cut the nickel contacts instead of soldering. Installing the circuit board and soldering the wires to the pins was easy, although I had to break my big solder.

Brushes for a Makita electric screwdriver

Brushes used for an electric screwdriver have a graphite base. Their cost to date ranges from 2-5 y. е. They are located in the housing of the electric motor and are two graphite cubes attached to metal plates. They wear and fray with heavy use.

If you repair with your own hands, you can file them out of brushes from another tool, like a car starter motor. After sharpening, they should be inserted into the brush holder and put in place, reassembling the motor.

Repair of electric screwdriver “Makita

Repair of electric screwdriver “Makita” button

The on/off button on the tool is a complex electronic mechanism. It consists of several components:

When repairing the button you must first disassemble it by removing the housing screws and disconnecting the battery. After that you must check connections and pins for debris and clean them. If cleaning of the contacts does not solve the problem, the button should be replaced.

Repair of the battery charger of a Makita electric screwdriver

When repairing the charger, it is necessary to unscrew the screws that fasten the housing covers. Inside there is a printed circuit board with contacts. First you need to check the transformer with a tester. To do this you must measure the voltage at the output. Then the cable should be tested to rule out fracture. Then check the primary and secondary windings of the transformer and the fuse. Reassemble it in the reverse order.

Makita electric screwdriver battery repair

If the battery is to be repaired, loosen the screws on the housing using a Phillips screwdriver. There are several cans inside the case. With a visual inspection, inspect them and identify geometry irregularities, such as bloating, for example. Test the banks with a multimeter for residual charge. If it is missing, the can is replaced with a new one.

Repair of the gearbox of a Makita electric screwdriver (diagram)

To remove the gearbox, you need to disassemble the housing by removing the screws with a Phillips screwdriver. Remove the start button, reverse switch button, unscrew the screws that fix the motor to the gearbox. Then it is necessary to take out the contents of the gearbox (various gears), the washer of the speed selector. When examining the empty gearbox, special attention should be paid to the teeth around the circumference of the gearbox housing. If they are worn out, the gearbox will not be able to perform its function: the speed selector will not work properly. To restore the teeth it is necessary to use small bolts, inserting them in place of the original plastic ones. The reducer should be assembled in the reverse order. A diagram of the gearbox is shown in the figure below. This shows the general diagram of the gearbox.

Description, general information

Makita manufactures a variety of power tools, among which there are screwdrivers. The history of the company dates back to the beginning of the twentieth century, and to this day it continues to delight consumers with its high quality products. Let’s look at the general features and characteristics of the models of this company.

Makita screwdrivers are characterized by great power. The average speed for the different models is about 2300 rpm, which is not a bad indicator compared to other brands. Most tool models weigh in the range of 1.5 kg. Its small mass suggests that such a tool will be comfortable to work with. The manufacturer has taken care of and about the convenience of working in poorly lit rooms, making the majority of models with LED backlight. Separate mention should be made of the handle for holding these tools in the air. As a rule, they are made rubberized, and therefore it is convenient to hold them in the hand, respectively, the work process is much easier.

The disadvantages of these screwdrivers are the strong handle vibrations during operation and their batteries that do not last very long. In addition, the price of the products of this company is quite high, which is important for domestic consumers.

Scheme, structure of the electric screwdriver “Makita”

Consider the construction of an electric screwdriver on a particular model 6271D. The schematic of this model is presented in the figure below.

Schematic 1

The diagram shows:

  • Switching lever
  • Body assembly
  • Nameplate
  • Screw
  • Spring
  • Reverse lever
  • Start button
  • The contact terminal
  • Screw
  • Quick-action chuck
  • Gearbox assembly
  • Electric motor
  • Screw
  • Body assembly
  • The charging unit
  • Battery

A modern electric screwdriver is a high-tech device. Important structural elements:

  • Removable battery
  • Rubberized handle grip
  • Powerful electric motor
  • Metal planetary gear
  • Soft start button
  • Reverse switch button
  • Torque regulator

These are the basic components of an electric screwdriver that are included in the basic equipment of any electric screwdriver model.

Disassembly of a Makita electric screwdriver

You will need a Phillips screwdriver and a bit of personal time to disassemble an electric screwdriver. To disassemble an electric screwdriver completely, you need to:

  • Unscrew the housing screws;
  • Remove the composite mechanism of the starter button;
  • Remove the electric motor together with the gearbox;
  • disconnect the gearbox from the motor by unscrewing the screws that fasten them.

To disassemble an electric screwdriver battery, you need to unscrew the screws that connect the case, or separate the case’s adhesive-based connections with a soldering iron. Inside the battery there are several nickel-cadmium batteries that have a certain capacity and carry a charge. If the battery is repaired you need to replace them with new ones.

The cartridge is changed with a screwdriver and an Allen wrench. First use the screwdriver to unscrew the fastening screw in the chuck and turn it clockwise. Then you put in the hexagon, turn on the reversing button, clamp, and then the chuck gives way easily.

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