How to remove a gear from a screwdriver motor

How to change the gear on the electric motor of a screwdriver

The screwdriver is a useful tool that is often used in construction work to speed up the process. Breakdowns on this type of device are not uncommon, and therefore you need to know how to fix them. One of the most common problems, which is also the most difficult to fix, is how to remove the gear from the screwdriver motor. The article will describe in detail how to do this with improvised means or using a special puller.

remove, gear, screwdriver, motor

Gear on the screwdriver motor

Is it possible to independently replace the gear on the electric motor of the screwdriver

It is possible to fix this problem on your own, but the operation is rather complicated (due to a fragile assembly that must be removed from a thin shaft), and everything must be done very carefully, since there is a risk of breaking off the teeth. Then you have to buy a new gear.

You can independently remove the gear from the screwdriver motor (for example, the “Bosch” model) using a lighter and pliers, or a thin U-shaped piece of metal. But experts do not recommend using this option, since there is a risk of damaging the teeth.

With a puller

The problem when removing the gear from the motor is that it sits very deeply (near the engine itself), and therefore there is practically no way to slip the puller “jaws” into the necessary grooves for dismantling. This difficulty is observed on most models of screwdrivers and electric drills.

How to change a gear on a screwdriver motor. three methods:

  • Try to grind off the “lips” of the puller to make them as thin as possible. The operation is risky, because with excessive grinding, the “jaws” can simply break off during the dismantling process. In addition, this puller will no longer be used to remove other nodes, since it simply will not withstand the load. Therefore, this method can only be used if the puller was purchased only to remove a specific gear.
  • The second method is preferable if you need to remove a whole gear from an unnecessary engine (after work, it remains only to remove it or use it as a “donor” of spare parts). For the operation, you must use a vise. The motor is placed in the clamp vertically. so as to crush the part that is near the gear shaft inside the engine. Of course, after the operation, the motor must simply be thrown away, since it will no longer be possible to use it. But there will be the necessary clearance and the ability to place a ready-made, fully functioning puller in its original position for dismantling.
  • And the last method can be used in a situation where the master needs the motor itself, but he no longer needs the gear. In this situation, it is necessary to make an angle grinder to make notches on the gear teeth in such a way that there is a place for installing the “lips” of the puller. It is important to ensure that the motor is not damaged when working with an angle grinder, which can easily slip off the work surface. After the operation, the gear will only have to be thrown out.

Many craftsmen, with an unsuccessful attempt to remove some unit of the unit, try to knock on it with a hammer, in the hope that it will move from its place, and it will be possible to dismantle it further without much effort.

Important! It is categorically impossible to knock on the gear, since it rests on the impeller located inside the motor.

In this situation, the impeller will simply come out of its grooves, and it will be very problematic to put it back. However, even after the successful return of the impeller to its place, in the process of operation in the future it will constantly pop out of its grooves.

If there is no possibility or desire to buy a puller, then you can make it yourself with your own hands. In terms of time, production will take about an hour, and everything you need should be in the garage of any master.

Materials required in the work:

  • M5 tap for threading.
  • Several files that are in good condition: square, flat and triangular. They must be small.
  • Vise.
  • Wrench nut for 27.
  • Hexagon bolt with M5 thread.
  • One side of the nut must be cut almost to the very edge.
  • On the side, additionally cut a hole into which the gear shaft will be placed (made after measuring a specific shaft).
  • From above, above the side that was cut down, drill a hole and cut the thread with an M5 tap. The corresponding screw will be placed there, with which the gear will be squeezed out of the motor housing.

The puller will not be difficult to make for a person who has dealt with plumbing work.

How to remove a gear from a screwdriver motor

To remove the gear from the motor of a screwdriver (or drill), you can use only two methods. The first requires a special puller. You can make it yourself, or try to find it on the Internet, for example, on the Aliexpress website.

The second option is not so reliable, since you will have to use improvised equipment that is not specifically designed for dismantling small parts.

Each of these methods has its own characteristics, which you need to know about before starting work.

When is it necessary to repair or replace the gear

The most common problem in which you have to replace the screwdriver gear (for example, the Interskol model). the motor itself burned out. In this case, you need to purchase a new engine, which already has a gear. But, there is an important nuance. the problem is that on an electric motor the factory gear may not fit the gearbox that is installed on the screwdriver itself. In this case, you either need to look for an engine that matches the size of the gearbox, or you need to perform an operation to replace a small unit.

Another problem: the chuck starts to spin during operation. This only indicates a malfunction of the gearbox, or rather, the gear, which does not cling to the teeth. This results in cartridge overshoot. Failure of this unit indicates that the motor is not turning the spindle.

Screwdriver gear assembly

An experienced craftsman can understand that the unit in question is to be replaced if extraneous noises begin to appear in the gearbox during operation, and slippage or large jerks are observed during the spindle rotation.

Important! The gear begins to fail in most cases due to the fact that it is made of plastic. This option is often found on the cheapest screwdrivers (for example, “Metabo”).

The unit in question cannot be repaired even if it is made of metal, and therefore it must be replaced.

All operations that a master may think of to repair a gear will end in failure due to the small size of the unit and the impossibility of securely attaching the fallen teeth, and therefore it is not worth wasting time.

Important! After the direct replacement of the gear, it is necessary to apply a large amount of lubricant to it so that the operation of the equipment is as smooth as possible and the components do not wear out.

Without puller

The operation can be performed without a special puller, but the risk of damaging the gear increases. The first step is to thoroughly heat the gear so that it expands and gets off the shaft better. To do this, you can use an ordinary lighter.

After heating, several removal methods are used (at the option of the operator):

  • If the motor is not needed in the future, you can use a flathead screwdriver as a lever, and the motor will serve as a fulcrum. To dismantle, you need to gradually push the gear away from you.
  • If the engine cannot be damaged, you will have to take a small and thin metal plate in the shape of the letter “P”. The edges of the plate should rest against the teeth. After heating, it is necessary to firmly but gently pull the plate.

The information provided is enough to understand how to remove a gear from a screwdriver motor at home.

Korovin Sergey Dmitrievich

Master of Architecture, graduated from the Samara State University of Architecture and Civil Engineering. 11 years of experience in design and construction.

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How to disassemble a screwdriver

Screwdriver. it is the only technique that ideally combines compactness, energy independence and high functionality. A wide range of tasks can be done with just one small tool. from simple tightening of self-tapping screws and creating holes in soft materials to complex precision work in a large volume.

Compared to other devices of this type, the screwdriver has gained great popularity not only among people involved in construction and repair, but also among home craftsmen. Therefore, he can be safely compared with a man, if he is, then your shelves will be well fixed, pictures are hung, and furniture is securely assembled.

However, despite its many positive qualities, situations may arise when it is necessary to completely disassemble the product in order to change the lubricant or replace worn out and defective parts. Of course, the right decision in this situation would be to visit a service center. But when there is no time for this or the warranty period has long expired, there is only one way out. to restore its performance on your own.

How to properly disassemble a screwdriver

All products are outwardly similar to each other. The design has a characteristic pistol shape, the body is made of durable shockproof plastic, and a keyless chuck is used to attach the working equipment.

Before you start disassembling the tool, you need to study its main components in detail. Since the most popular is battery-powered technology, we will consider it.

The internal filling of the device consists of:

Push button
Regulator of revolutions
Engine
Transistor
Planetary gearbox

Step-by-step instructions for complete disassembly of the screwdriver:

Disconnect the battery pack.
Use a Phillips screwdriver of the correct size to remove the screws that are around the perimeter of the entire case.
Unscrew the screws and detach the case without sudden movements, holding small structural elements.
Pay attention to the speed switch, start and reverse buttons. In order to avoid breakage of these small parts, it is recommended to carefully disconnect them.
To get the gearbox in your hands, release it together with the engine from the second half of the case, hold it in your hands and turn it counterclockwise.

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Screwdriver gearbox

It consists of gears and gears interconnected with each other. All small components of the mechanism are compactly placed in a rigid plastic case (crankcase). They are reliably protected from the ingress of foreign objects and work on the principle of a single ensemble.

Depending on the type, the gearbox can be planetary and classical. Since the second is practically not used anymore, we will consider the design of the planetary mechanism, as well as the principle of its operation.

The gearbox design includes the following components:

Ring gear, which is located in the center of the mechanism.
Driven gear (carrier). It reliably fixes the axles of several planetary gears “satellites” located relative to each other. They have the same diameter and engage with the teeth on the inner surface of the “cogwheel”. Construction parts can be plastic or metal.

Gearbox for screwdriver with two-stroke motor

Depending on the number of gears, the reducer can be single-stage or multi-stage. The most common are the mechanisms consisting of two gears (two-stage). Their principle of operation consists in the rotation of satellites, which are driven by the circular motion of the ring gear of the engine. The use of such a mechanism allows you to make the speed of the carrier an order of magnitude lower than the speed of the motor.

The sequence of actions is as follows: the rotational movements of the first carrier go to the second, which in turn is connected to the chuck shaft. The transmission takes place through the central gear. The trinity of stellites of the second block works on the same principle as the first, as a result. the second carrier gets even lower revs. This action is typical for a two-stage gearbox. In the case of the three-stage, another planetary gear is added.

Disconnect the gearbox from the electric motor using the method described above.
Remove the plate and start taking out all the parts in order.
Unscrew the screws connecting the two halves of the gearbox.
If necessary, use pliers to adjust the spring diameter downwards, this will improve the engagement of the first gear.
Clean and lubricate the main components.
Assemble the entire mechanism, performing all the steps in reverse order.

It is worth noting that the reducer. this is a mechanism that is practically impossible to repair. The components of this mechanism are not produced by manufacturers. If the wires can be soldered, and the button replaced, then in the case of teeth and gears, only one way will be correct. complete replacement of this node.

How to remove a chuck from a screwdriver

A keyless chuck is used in the screwdriver, which is the most loaded, and therefore the most wearing part of the entire mechanism. It can be fixed by the following method:

Morse taper. the chuck has the same tapered bore as the shank.
2. Threaded method. the chuck is screwed onto the threaded end of the shaft.
3. Screw method. the chuck is secured with a fixing screw.

To determine which connection method is used in your tool, you need to inspect it and pay attention to the digital markings on the side of it. If you see the inscription 1-6 B10, then the Morse taper is used in the design of the cartridge. The numbers indicated show that the maximum and minimum diameter of the drill shank that can be clamped into the chuck is 1.6 mm. B 10.Morse taper size.

The threaded connection can be metric and inch. In the first case, it will look like. 1.0-11 M12x1.25. In the second. 2-13 mm ½-20 UNF.

Marking on the screwdriver chuck

Removing the cartridge

Threaded connection :

Unscrew the screw fixing using the L-shaped hex key.
Place the key with its short edge into the chuck and clamp it tightly in the jaws of a vise.
Put the device in drilling mode and turn it on at low speed. The free edge of the key should hit a table or other hard object.
Unscrew the chuck by turning the key.

Threaded connection with fixing screw:

Open the inner jaws of the chuck.
Unscrew the left-hand screw connection clockwise with a screwdriver.
Take the hex L key and clamp it tightly in the chuck with the short edge.
Try to turn it sharply counterclockwise.
If the chuck does not come off, hit the edge of the wrench with a hammer. It should loosen and come off the thread easily.

Morse taper

To remove the chuck fixed by the conical method, a couple of careful blows with a hammer on the body are enough.

How to properly charge the battery

There are 3 main types of batteries used for screwdrivers: Li-Ion (lithium-ion), Ni-Cd (nickel-cadmium) and Ni-MH (nickel-metal hydride). Each of the options requires a different and precise adherence to the correct mode of operation.

Li-Ion. the most common battery. Its main advantages are small size, weight, fast charging and no memory effect. The downside is the fear of low temperatures. As for the price, compared to other types of batteries, it is an order of magnitude higher.

To start using the battery, it is enough to completely discharge it once and charge it to 100%. Then you can safely operate it without thinking about the amount of charge. The only caveat. charged storage. This is necessary so that the internal parts do not dry out (optimal mode. 60% charge).

Ni-Cd is also one of the most common types of batteries, with a large capacity and small size. The price is much cheaper in relation to other types of batteries. The main disadvantage. the presence of a memory effect. Before using such a power source, it is necessary to complete 3 complete discharge / charge cycles. Failure to do so could result in a significant drop in battery capacity.

Ni-MH is a less popular battery, the undoubted advantage of which is absolute environmental friendliness and lack of memorization. The only imperfection. high self-discharge current. That is, when it is idle for a long time, it is completely discharged, and each subsequent charge increases the self-discharge current. If you forget to charge such a battery, it will fail over time. Before starting to use, the battery, like a lithium-ion one, must be immediately discharged and put on charge up to 100%.

And in conclusion

Based on this article, you can independently disassemble the screwdriver for the purpose of minor repairs, cleaning and lubricating the internal components. This should be done only if during the operation of the equipment you notice any interference, for example, speed modes do not switch or this happens with a certain delay. It is not recommended to use gears or couplings from other tools. Outwardly, they may look suitable, but in fact they do not correspond to the components of this model.

In order for the equipment to serve you as long as possible, and it does not have to be disassembled often, follow these simple rules:

  • Do not operate the device at high speeds for a long time.
  • Check how charged your battery is before use.
  • The fit size of the nozzle must match the fit size of the tool.
  • After changing the bit, make sure that the chuck is correctly locked.

Additional measures

Sometimes there is such a situation when none of the methods helped to cope with the problem. Then you will have to completely untwist and disassemble the entire tool, and then remove the spindle with the chuck and the gearbox from the structure. All that remains should be well clamped in a vice, and then the cartridge can be removed using a key. It is worth noting that you need to clamp very carefully: there is a risk of unit breakdown due to too much effort.

It is worth noting that in some models of screwdrivers grooves are installed, with which you can simplify the task of removing. But in a modern instrument, this is quite rare.

The chuck can jam if the tool is overheated. That is why it is necessary to periodically let the machine rest. It is also worth making sure that the cartridge does not start “hitting”. This can also cause a malfunction.

Device and malfunctions of the screwdriver

All screwdrivers are similar. They consist of the following functional units:

  • start button;
  • pulse-width regulator;
  • electric motor;
  • transistor;
  • planetary reductor.

All components of the device are in a durable and aesthetic case, which has a rubberized handle, control and adjustment buttons, as well as a slot for installing a battery (if the screwdriver is designed only for operation from a 220 V network, it does not have a battery).

When you press the start button not completely, the screwdriver may squeak. It is normal for DC motors to operate at startup and at low rpm.

removing the plastic plug from the screwdriver chuck

Common cartridge malfunctions:

  • clamps the bits crookedly;
  • play between bits and cams;
  • cams move out unevenly.

To find out the causes and eliminate them, follow these steps:

  • Disassemble the cartridge.
  • Remove the flare nut, which is in two parts.
  • Unscrew the clamping jaws.
  • Check the condition of the threads on the nut and on the cams, replace defective parts.
In the process of working on the cams or the flare nut, which controls their work, the thread may develop or crumble, then these parts must be replaced

Assemble the cartridge in the reverse order of disassembly.

Replacing brushes

Graphite brushes are located at the end of the motor from the side of the connection with the button. They can be located inside the motor housing under the rear cover or outside. If at least one of the brushes is 40% worn, replace both. Check your contacts. The following symptoms indicate wear on the brushes:

  • the engine runs in jerks;
  • sounds unusual for normal operation are heard;
  • sparking;
  • the smell of burning.
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When removing and installing brushes, you need to hold the holders, otherwise, under the action of a spring, they can fly quite far

How to remove a cartridge from a screwdriver on YouTube

The screwdriver can be repaired independently, having studied its structure and the principles of operation of individual units.

disassembly and repair of a cartridge with a metal plug

Removing the chuck from the screwdriver shaft

Dismantling of the part is carried out with a 10 mm L-shaped hexagon wrench. The short part of the key is fixed in the chuck. Then the unit turns on, the free end of the key should hit the surface of the table or workbench. It can be removed by turning the key and then it should slide effortlessly along the thread.

Let’s describe another way to replace the chuck on a screwdriver. The first step is to open the cams. A screw can be placed at the bottom, this is an additional shaft fastening. We twist it clockwise. Then we clamp the hexagon and turn it with force in the opposite direction. it should be removed from the shaft. If the part does not give in, you need to hit with a hammer at the end of the key.

If these methods did not work, you will have to carry out a complete dismantling, remove the gearbox and retainer along with the spindle. The extended mechanism is fixed in a vice, the chuck is unscrewed from it with a pipe wrench. There are clamps with a recess for an ordinary wrench, it makes it easier to dismantle, but these copies rarely come across.

On a Morse taper, the part is knocked out of the body with a hammer.

To have a more complete picture of how to disassemble the screwdriver chuck, the video for review is presented below.

Dismantling and repair of the gearbox

The main elements of the gearbox:

They are made of metal and plastic. A ring gear is a cylinder with internal teeth all around its circumference. Satellites move along the teeth.

The first carrier has two gears at both ends. The first sun is the drive gear of the engine. She enters between the satellites of the first carrier. The second sun on the opposite side enters between the satellites of the second carrier. In a two-stage gearbox, the second carrier is connected to the shaft on which the cartridge is put on. The three-stage gearbox has another mechanism. All these parts are located inside the ring gear.

The engine transmits rotation to the first stage satellites through the sun gear. The first carrier rotates the second stage of the satellites. If there is a third stage, then the second carrier rotates it. The satellites of all stages rotate inside the ring gear. The last carrier rotates the chuck shaft. With each transmission of torque, the speed drops.

Gearbox disassembly sequence:

  • Removing the cartridge.
  • Unscrewing the case.
  • Disconnecting the gearbox from the engine.
  • Removing the plate.
  • Removing all parts from the body.

When disassembling the gearbox, all parts are removed sequentially: first the satellites of the first stage, and then the second

  • Unscrewing all the bolts that connect both halves of the gearbox.
  • Correction of spring diameter using pliers to improve gear engagement.
  • Disassembly of the coupling by removing the retaining ring, washers, bulk bearing.
  • Removing the shaft.
  • Lay out all the parts of the disassembled gearbox in order, so that later it will be easier to assemble.

    How to remove motor gear

    • If, during the operation of the screwdriver, a grinding sound is heard or it twitches, then the gearbox has defects. During work, you have to make lateral pressure and heavily load the tool. As a result, the gearbox shaft is bent and a noticeable runout occurs. In this case, the assembly is changed in assembly.
    • If the support sleeve and shaft bearing are worn out, they can be replaced with similar ones.
    • Breakage of the pin of the satellite is accompanied by the start and instant stop of the engine. Replace carrier or gearbox.
    • The wear of the gear teeth also requires replacement of the gearbox.

    Often, gearbox repairs are all about cleaning and lubricating. Do not overdo it with grease, otherwise the device will not work well.

    If you want to change the engine on your screwdriver, watch this video, there is nothing difficult about replacing the engine. The most important thing is to find a donor. All screwdriver motors are the same in size, they differ only in operating voltage and gears. It will not work to remove the gear from the shaft just like that, for example by knocking out, and if it does, then with damage to the gear. I made the simplest puller at home from the available materials in 10 minutes, it quietly squeezes out such gears.

    Video How to repress a screwdriver motor gear? The easiest way! channel Alex K

    Puller so that you can pull the gear off the screwdriver motor.
    I spied on the idea on YouTube, but there a man made it out of a very small nut.
    It took in time, somewhere an hour, an hour and a half, I did it from what was at hand, the tap was found M5, a couple of files, triangular, flat and square, rasping bastardness, a vice and, most importantly, hands))))

    I have not tested it yet, I decided to make a puller after I could not disassemble the engine from the Hitachi screwdriver to the screw

    I wrote it for what, on Ali and in shops, such a puller costs from 400 to 1500 rubles, you can make it from what you have, even if you buy everything, then the nut costs 30 rubles in leroy, the taps are 100 rubles maximum, everyone probably has a file. hands and time.
    The slot was made by an angle grinder, with a cut-off wheel, with the same circle and expanded.

    I disassembled the engine, and the smell went off, it can be seen between the rotor and the stator dust began to fall.

    UPdate: made fitting

    Tags: gear puller, screwdriver

    Comments 31

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    no, 550 were more likely all of him, there is still a little more and a little less

    All were 12 volts, the older terminals were slightly thicker. Now they probably already put neodymium magnets on expensive equipment

    motors for the cheap and expensive segment are standardized in terms of docking dimensions, expensive ones may have their own bodyless, brushless, etc. for example, Bosch in the blue series for 12v Shura put a standard motor, which is suitable for both Makita and Metabo, they are all compatible. The situation is the same with buttons. Akums, there is generally such a spread, all manufacturers put the cheapest banks, just brands put Samsung, false, etc., the Chinese are what is left))))

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    He also repaired a few, on shurahs from 9 to 14 volts there are the same motors.

    you can always identify the driver of the BMW. he sooo neatly overcomes all speed bumps, pits, potholes. because repairing a BMW is a fiasco for the budget

    Where can I find a video or any explanatory diagram that will help to independently remove the gear from the engine on the “Makita” screwdriver?

    It is a pity that the brand of this screwdriver is not indicated, but I think that basically the line of this brand should be more or less the same. Since the sprocket on the engine is pressed in quite strongly, it can only be removed with the help of a special puller. Since pullers are still not available to all users of such wonderful equipment as Makita, I strongly advise you to contact the service center, where they will very quickly remove you and, if necessary, replace this part (most likely with high-quality, and not with that junk that is sold On the market). Well, if you still want to see how to remove this gear using a puller, then I advise you to watch a video on this topic here.

    How to remove a gear from a screwdriver motor

    If you want to change the engine on your screwdriver, watch this video, there is nothing difficult about replacing the engine. The most important thing is to find a donor. All screwdriver motors are the same in size, they differ only in operating voltage and gears. It will not work to remove the gear from the shaft just like that, for example by knocking out, and if it does, then with damage to the gear. At home, I made the simplest puller from the available materials in 10 minutes, it quietly squeezes out such gears.

    Video How to repress a screwdriver motor gear? The easiest way! channel Alex K

    Puller so that you can pull the gear off the screwdriver motor.
    I spied on the idea on YouTube, but there a man made from a very small nut.
    It took in time, somewhere an hour, an hour and a half, I did from what was at hand, the tap was found M5, a couple of files, triangular, flat and square, rasping bastardness, a vice and, most importantly, hands))))

    I have not tested it yet, I decided to make a puller after I could not disassemble the engine from the Hitachi screwdriver to the screw

    I wrote it for what, on Ali and in shops, such a puller costs from 400 to 1500 rubles, you can make it from what you have, even if you buy everything, then the nut costs 30 rubles in leroy, taps are 100 rubles maximum, everyone probably has a file. hands and time.
    The slot was made by an angle grinder, with a cut-off wheel, with the same circle and expanded.

    I disassembled the engine, and the smell went off, you can see dust began to get between the rotor and stator.

    UPdate: made fitting

    Tags: gear puller, screwdriver

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    no, 550 were more likely all of him, there is still a little more and a little less

    All were 12 volts, the older terminals were slightly thicker. Now they probably already put neodymium magnets on expensive equipment

    motors for the cheap and expensive segment are standardized in terms of docking dimensions, expensive ones may have their own bodyless, brushless, etc. for example, Bosch put a standard motor in the blue series for 12v, which is suitable for both Makita and Metabo, they are all compatible. The situation is the same with buttons. Akums, there is generally such a spread, all manufacturers put the cheapest banks, just brands put Samsung, false, etc., the Chinese are what is left))))

    READ  How To Disassemble A Rotary Mower

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    He also repaired a few, on shura from 9 to 14 volts there are the same motors.

    you can always identify the driver of the BMW. he sooo neatly overcomes all speed bumps, pits, potholes. because repairing a BMW is a fiasco for the budget

    Where can I find a video or any explanatory diagram that will help to independently remove the gear from the engine on the “Makita” screwdriver?

    It is a pity that the brand of this screwdriver is not indicated, but I think that basically the line of this brand should be more or less the same. Since the sprocket on the engine is pressed in quite strongly, it can only be removed with the help of a special puller. Since pullers are still not available to all users of such wonderful equipment as Makita, I strongly advise you to contact the service center, where they will very quickly remove you and, if necessary, replace this part (most likely with high-quality, and not with that junk that is sold On the market). Well, if you still want to see how to remove this gear using a puller, then I advise you to watch a video on this topic here.

    In what cases it is necessary to remove and repair the unit?

    The following symptoms may indicate a malfunction of the cylinder head on the VAZ 2107:

    • the engine is troit;
    • black smoke coming out of the exhaust pipe;

    Black smoke from the exhaust pipe

    • spark plugs are splashed with oil;
    • decrease in vehicle power.

    How To Make a Gear Extractor. DIY Motor Pinion Gear Puller Remover

    Front support replacement

    • We drive the seven into the hole and put stops under the wheels to securely fix the car. Remove the mudguard from the right side. This will allow access to the front cushion.
    • Now it is necessary to unscrew the nut of the upper fastening of the support. A 17 socket wrench will come in handy.
    • The lower support nut is located in a special hole in the front beam and is unscrewed with the same key by 17.
    • Now you need to remove the old pillow to replace it. But this is prevented by the engine, which clamps the support with its weight. To raise the engine, we need a jack. We put a board under the crankcase so as to block the inspection hole. The board should protrude from the edge of the pit with its edges at least 20 centimeters on both sides. The board must be thick and strong enough to support the weight of the motor. A jack is installed on it and the engine rises through the gasket from the board 20 by 20 centimeters. The motor will rise quite a bit until it stops. But that will be enough to take out the old pillow.
    • We put a new support and tighten the nuts. To lure the lower nut onto the stud, it must be inserted into the key.

    Replacement for each of the front supports is carried out in a similar way.

    Without removing the checkpoint

    In short, it is quite possible to dismantle the engine from your “seven” without removing the gearbox. To do this, you will have to follow these steps:

    • Place bricks or other reliable supports under the gearbox;
    • Unscrew the left crab, take the stretch aside;
    • Remove the generator, crankshaft pulley, camshaft gear from the motor;
    • The pump, tensioner stud, distributor, exhaust pipe are also dismantled;
    • If a major overhaul is planned, then you can also remove the head;
    • Then the engine support is removed;
    • The motor slides off the box and drops to the floor. To remove the engine, the front part is raised higher with a jack and the volume is obtained;
    • Or can be pulled out over the top with a winch.

    Engine Mount Device:

    • – support casing;
    • – support for the front engine mount;
    • – cylinder block flange;
    • -bracket;
    • – intermediate plate;
    • – insulating plastic ring;
    • – support spring;
    • – buffer;
    • – support cushion;
    • – washer;
    • – support for the rear engine mount;
    • – distance sleeve;
    • – cross member of the rear engine mount.

    Tension the hoist chain slightly, unscrew the nuts securing the cushions 9 of the front engine mount to the cross member of the front suspension and remove the engine from the compartment.

    Remove the starter heat shield, starter and hot air intake along with the supply hose. Remove the two side brackets with cushions of the front engine mount from the cylinder block.

    Unscrew the clutch mounting bolts and remove it.

    How to remove a gear from a screwdriver motor

    How to remove the engine “seven” step by step instructions

    Sequence of work when removing the engine

    Disconnect the coolant inlet and outlet hoses from the engine and remove the radiator together with the thermostat, hoses and the fan motor.

    Remove the air filter by first disconnecting the hoses from it, removing the cover and the filter element. Close the carburetor with a process plug.

    Use a spanner wrench to unscrew the nuts securing the front exhaust pipe to the exhaust manifold.

    Remove the gearbox as described in the clutch article.

    Disconnect the carburetor throttle actuator rod and choke cable from the engine. Disconnect the fuel supply hose and hoses to the heater from the engine.

    Hang the TCO-3/379 traverse on the hoist and tie the engine on the right side by the bracket installed on the front stud of the exhaust manifold, and on the left side. by the hole for fastening the clutch cover.

    • First, unscrew the two nuts securing the gearbox crosshead.
    • Then the fasteners of the rear motor support are unscrewed from the gearbox.
    • Then the entire traverse is removed along with the pillow.
    • Using a 13 key, the pillow is unscrewed from the traverse.
    • When installing a new engine mount, remember to replace the spacer sleeve installed between the mountings of the pillow.

    Tags: gear puller, screwdriver

    Puller so that you can pull the gear off the screwdriver motor.
    I spied on the idea on YouTube, but there a man made from a very small nut.
    It took in time, somewhere an hour, an hour and a half, I did from what was at hand, the tap was found M5, a couple of files, triangular, flat and square, rasping bastardness, a vice and, most importantly, hands))))

    I have not tested it yet, I decided to make a puller after I could not disassemble the engine from the Hitachi screwdriver to the screw

    I wrote it for what, on Ali and in shops, such a puller costs from 400 to 1500 rubles, you can make it from what you have, even if you buy everything, then the nut costs 30 rubles in leroy, the taps are 100 rubles maximum, everyone probably has a file. hands and time.
    The slot was made by an angle grinder, with a cut-off wheel, with the same circle and expanded.

    I disassembled the engine, and the smell went off, it can be seen between the rotor and the stator dust began to fall.

    UPdate: made fitting

    Comments 31

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    no, 550 were more likely all of him, there is still a little more and a little less

    All were 12 volts, the older terminals were slightly thicker. Now they probably already put neodymium magnets on expensive equipment

    motors for the cheap and expensive segment are standardized in terms of docking dimensions, expensive ones may have their own bodyless, brushless, etc. for example, Bosch put a standard motor in the blue series for 12v, which is suitable for both Makita and Metabo, they are all compatible. The situation is the same with buttons. Akums, there is generally such a spread, all manufacturers put the cheapest banks, just brands put Samsung, false, etc., the Chinese are what is left))))

    Disassembled several (4) screwdrivers from different companies, all have the same Chinese motors. Coincidence?!

    He also repaired a few, on shurahs from 9 to 14 volts there are the same motors.

    you can always identify the driver of the BMW. he sooo neatly overcomes all speed bumps, pits, potholes. because repairing a BMW is a fiasco for the budget

    Where can I find a video or any explanatory diagram that will help to independently remove the gear from the engine on the “Makita” screwdriver?

    It is a pity that the brand of this screwdriver is not indicated, but I think that basically the line of this brand should be more or less the same. Since the sprocket on the engine is pressed in quite strongly, it can only be removed with the help of a special puller. Since pullers are still not available to all users of such wonderful equipment as Makita, I strongly advise you to contact the service center, where they will very quickly remove you and, if necessary, replace this part (most likely with high-quality, and not with that junk that is sold On the market). Well, if you still want to see how to remove this gear using a puller, then I advise you to watch a video on this topic here.

    If you want to change the engine on your screwdriver, watch this video, there is nothing difficult about replacing the engine. The most important thing is to find a donor. All screwdriver motors are the same in size, they differ only in operating voltage and gears. It will not work to remove the gear from the shaft just like that, for example by knocking out, and if it does, then with damage to the gear. I made the simplest puller at home from the available materials in 10 minutes, it quietly squeezes out such gears.

    Video How to repress a screwdriver motor gear? The easiest way! channel Alex K