How to disassemble the motor from a screwdriver. Electronic adjustment of the rotation speed of a screwdriver

How to disassemble the motor from a screwdriver

Before disassembling a screwdriver, you need to know the purpose of certain nodes and mechanisms in the design of the tool. The principle of operation of all screwdrivers is the same. The start button supplies the voltage to the engine and regulates the speed.

The main mechanisms of the screwdriver, whether it is interskol (Interskol), Caliber, Bosch (Bosch GSR, PSR), Devolt (DeWALT), Hammer, Makita (Makita), Metabo (Metabo), Dexter (Dexter) similar and work the same way:

  • Engine (brush or brilliant).
  • Power button.
  • Revolutionary function adjustment system.
  • Gearbox.
  • Control block.
  • Self.Loading or fast.Packed cartridge.

On the screwdriver housing are located a rubberized handle and connectors for connecting the battery. For battery models, nickel-cadmium (nicd) or lithium-ion (Li-Ion) power elements with a power of 10 are used.8, 9.6, 12, 14.4 and 18 volts. For network units, batteries are not intended.

The power button starts the engine that rotates the spindle through the gearbox. Distribution coupling adjusting the torque. There is a separate lever for the reverse mode. It allows you to twist stuck fasteners.

Repair or restoration of the screwdriver battery

Hello! Today I will touch on the theme of construction and summer summer cottages. I’ll tell you how to repair or restore the battery of a screwdriver with your own hands. I must say that a screwdriver is a very convenient thing. Charged the battery and run without wires you twist here and there. Only over time, such a twist twists less and less. This is due to loss containers batteries. We will talk about them.

How a screwdriver works

Everything is simple enough here. The simplest screwdriver consists of a plastic case, battery (1), rotation speed regulator (2), plastic button (3), engine (4), gearbox (5) and cartridge (6).

In modern screwdrivers The gearbox with planetary transmission of the force of rotation is most often used.

The insides of the screwdriver battery

Inside the battery, the screwdriver is very simple. Battery banks are interconnected among themselves with metal foil using spot welding. In the simplest case, everything ends with sliding contacts.

Complex batteries have a charge of the charge controller and discharge with monitoring the temperature of the cans. Most often, such boards are placed in the screwdrivers of branded firms with lithium-ion batteries.

Further, let us consider in more detail the advantages and disadvantages of different types of batteries and talk about the restoration of the battery with our own hands.

Types of battery elements

Over the past 20-30 years, many technologies of portable batteries have been developed: Ni-CD, Ni-MH, Li-Ion, Li-Pol, Al-Ion, Li-S, Mg-S, Li-O2, LIFEPO4 and even lithium- Nanophosphate. Consider the most popular of them.

Nickel-cadmium batteries

This is the most popular type of battery sections for cheap screwdrivers.

Advantages: they are cheap and can work well at negative temperatures. They are also not afraid of discharge and storage in this position.

Disadvantages: cadmium is toxic and such batteries must be disposed of in a special way. There is a self.Discharge and memory effect, low specific volumetric capacity.

Nickel-metallhydride batteries

Nickel-metallhydridids are slightly more expensive, but in general they are about the same, maybe a little better than nickel-cadmium.

Advantages: Not toxic, lower memory effect and self.Discharge, a larger number of charge/discharge cycles.

Disadvantages: They are more sensitive to negative temperatures, afraid of storage in a discharged state. They lose the capacity.

Lithium-ion batteries

Lithium-ion batteries are increasingly used in screwdrivers of even a budget class.

disassemble, motor, screwdriver, adjustment, rotation

Advantages: There is no memory effect. You can charge and discharge at any time, a large container with smaller dimensions, small self.Discharge, a large number of charges/discharges.

Disadvantages: high price, danger of excessive heating with intense charge and discharge.

disassemble, motor, screwdriver, adjustment, rotation

Lithium-polymer batteries

So far, lithium-polymer batteries are little used in screwdrivers, but with the development of technology, most likely they will begin to put them there massively.

Advantages: a large container with smaller dimensions than Li-Ion can take any shape, the voltage of the discharge holds better, low self-discharge.

Disadvantages: high cost, heating during operation and the danger of fire.

Recovery of battery elements

Here I will give a story from the master of Sergei to restore the nickel-cadmium battery of the screwdriver. The owner began to complain about the low time of the electric shurubrost and the fact that “the battery does not hold”. Dismantling of the battery housing showed that there are factory ni-cd banks from Liang for 1000 mAh.

You can restore the Ni-CD battery in a fairly simple way. You need to make several cycles of deep discharge and charge. In such extreme modes, hard.To.Reach areas of the accumulation of battery charge begin to work, the return on which has worsened due to the effect of memory, violation of operating conditions or storage conditions.

Such problems arise not only in screwdrivers. The industry of radio.Controlled models with battery power has long solved the problems of automated discharge/charge. There are special chargers for this.

Instead of such a charger, you can use something more Chinese, for example People’s IMAX B6 for about 2000 rubles.

It is best to start a cyclic recovery of the battery from the deep discharge of the battery and then immediately charging.

After the first cycle, the container during discharge was 707 mAh, and when charge. 879 mAh. As you can see, the capacity decreased by 30 % relative to the declared manufacturer.

The second discharge / charge cycle showed numbers 781 mAh / 937 mAh. As you can see, these are more than the previous values ​​by 10 %.

The third battery reloading cycle showed minor deviations from the previous second recalculation. Therefore, this is enough. If you see on your batteries that the container is growing, then you can continue.

On the fact of the recovery of the battery, it was possible to restore about 8% of the initially declared capacity of the screwdriver. In principle, it’s not bad, but I would advise you to replace the batteries with new capacity.

Replacement of battery elements

The battery has Nickel-cadmium power batteries for 1.2 V of the battery. They are not interchangeable, so it is better to select something similar to the original in size and as much capacity as possible from the available. In Sergey, the battery elements are similar to Type D size batteries, Therefore, we order them. Can be found with a capacity about 2400 mAh in the same size.

I already wrote how I changed the battery elements of the screwdriver intercol. It had lithium-ion banks at 3.7 in the budget class itself, and even discharged. Then I replaced them with batteries a little better. Now I would put branded Liitokala 2200 mAh or Panasonic batteries 3400 mAh of the size of 18650.

Diagnosis and elimination of malfunctions of the electrical part of the screwdriver

If you have a battery device, then the first thing you need to check the batteries in the battery block by dismantling it. There are collapsible and non.Vegetable blocks. In the second case, you will need to carefully insert the screwdriver into the place of gluing the walls of the block and, slowly, disconnect them.

Further, it is necessary Measure the tension On all “banks”. The voltage rating is indicated on the body of each battery. The voltage should be slightly lower than the indicated, but the same on the working batteries. Faulty batteries will differ significantly from the rest in the voltage issued. They will need to be replaced. New batteries can be purchased on the Internet.

If you are the owner network screwdriver, then the test algorithm is slightly different. At first, you need to promote the body of the apparatus and remove it one half. Take the tester and “call” the power cord for a cliff. In the case of a good cord, you need to check the start button. Check with a button pressed if there is a circuit on the output of its contacts. If the button is faulty, it will need to be replaced or repair. How to do this will be considered later. With a good button, the problem can lie in electrographs or engine.

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Repair button

Below is the electrical circuit of the battery screwdriver.

It shows from the diagram that 2 wires from the battery are suitable for the button, and 2 wires to the engine come out of it. Also, 3 wires from the transistor responsible for adjusting the revolutions are connected to the button. To understand the device of the screwdriver button, it must be disassembled. All wires going to this details can not be soldered. They will not interfere with disassembly.

Remove pressure mechanism (red) from your seat. Do this with neat rotational movements, while pulling the part in the opposite button, making sure that the joke does not break.

Next, remove button cover. In the places indicated in the figure with arrows, with the help of a knife and screwdrivers, you need to put and push the latches, then remove the lid.

Wowstick 1F Cordless Electric Screwdriver Teardown Disassembly Repair

Removing the lid, you will see Reversion compartment. But the button mechanism will still be unavailable. Using the soldering iron, disconnect 2 elements (the next figure is indicated by the arrow).

Gently pull out the element under number 1, then remove the cover that closes the compartment with the mechanism for turning on the device.

Holding the return spring, take out the mechanism from the body.

In a faulty button, you will see the erased contact sites.

Contact sites quickly wear out due to the poor quality of metal. Small metal dust from the cooked contacts accumulates between them and closes the platforms. As a result of this, a spontaneous launch of the apparatus occurs.

With the help of a cotton swab moistened in alcohol, remove metal dust. If this fails, you can scrap her with a knife. After these actions, the spontaneous launch of the device will stop.

Replacing brushes

To check the condition of the brushes, it is necessary Disassemble the engine, Bending the “antennae” located at the end of the case.

Next, with light beats of the hammer on the engine shaft, knock out the rotor from the body.

How to Repair Electric Screwdriver

In this case, the cover in which the electric shows will be removed first.

The next photo shows that the collector has black color. This means that it will pollute the dust from the brushes. As a result of the pollution of the collector, as well as the grooves between its plates, the engine power drops and the brushes sparkle. It is necessary to wipe the collector with cotton wool moistened in alcohol, and clean the grooves with a needle.

The following photo shows what a clean collector looks like.

If the brushes are worn out, they will need to be changed. It is difficult to find some models of screwdrivers on sale on sale Original brushes. But you can find brushes suitable in size, after which on a sharpener to trim them and connect (solder) to the brush holders.

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

The second method is more preferable. To use a special puller that will have to independently make or purchase in a store (the cost for 2021 starts from 350 rubles). Each option has its own disadvantages, which should be considered before starting work.

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

This problem can be eliminated independently, but the operation is quite complex (due to the fragile node that is to be removed from the thin shaft), and you need to do everything very carefully, since there is a risk of breaking the cloves. Then you have to buy a new gear.

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

The second method is more preferable. To use a special puller that will have to independently make or purchase in a store (the cost for 2021 starts from 350 rubles). Each option has its own disadvantages, which should be considered before starting work.

REPAIR OF THE WORkens engine

With long work with a screwdriver, bearings can be worn out or clogged.

Before the assembly of the screwdriver of the screwdriver using a thin wire that serves as a clamp, each brush is diverted in the brush holder, the lid is installed in the same place. At the same time, brushes release and envelop the housing at the edges, which contributes to the best pressing of the back cover.

If the screwdriver has been working for a long time, then this may be accompanied by the process of curvature of the shaft related to the gearbox due to strong loads and pressing the tool. The cartridge, blaming the shaft, sometimes causes a strong beating during the operation of the device. Supporting sleeve or shaft bearing can be very worn out. As a result of damage to the sleeve or only the bearing, and not only them replace the shaft.

Sometimes the engine is not possible for a certain fraction of a second, that is, its sharp stop occurs. This reason may be the failure of the gearbox. Often a malfunction occurs due to a breakdown of a pin that serves as a mount to satellite. It is possible to replace the drive or entirely a gearbox that may fail if the teeth of the gears are worn out.

If, after all the above operations, the malfunctions were not detected in the device, then it is necessary to verify the anchor condition and the serviceability of the engine brushes. In this case, the engine should be disconnected from the switch button, and then measure the resistance by attaching a tester of any kind to the engine wires. If the resistance in the circuit is completely absent, then this may indicate that the brushes are worn out. The malfunctions in the anchor of the engine are not excluded, which may be associated with the gap of the winding. At the same time, such types of problems can rarely meet.

If the engine anchor is completely burned out, then the device engine is subjected to the full replacement. If only the engine brushes occurred, then it is better to make the repair of the device yourself. Before starting the repair, it should smoothly open the body of the screwdriver engine so as not to damage its edges. All stages of work related to the replacement of brushes are indicated above. It is possible that the anchor’s bushings were worn out at the expense of the magnet, which came off and began to contact with the anchor. Dripping a drop of special oil to the sleeve, you should turn off the engine to wait until the oil has dispersed through all the bushings. At the same time, he still requires replacement over time.

Repair of the screwdriver button. Instruction and scheme

Screwdriver. A mobile tool that facilitates work with fasteners and threaded joints.

Until recently, battery screwdrivers could only be found in the arsenal of professionals, but with the advent of inexpensive inexpensive household models, their popularity increased sharply.

Unlike expensive professional tools, budget analogues have a smaller resource, which more often fail.

One of the weakest places of household screwdrivers is the start button and the reverse switch. As practice shows, it is they who break most often.

Over time, the tool ceases to respond to any manipulation. Often there is a problem of the opposite nature when the motor begins to work spontaneously.

In some cases, to eliminate the defect, it is enough to disassemble the tool and clean, although more often you need to complete Replacing the screwdriver button. Both in the first and in the second case, you can eliminate the problem with your own hands. About everything in order.

Device and main types of cartridges

A metal cylinder is called a cartridge or head, which is attached to the shaft of a screwdriver. Its task is to reliably fix the working bats for fasteners. The cartridge is fixed on Val with a thread or a special cone. By type of fastening, clamping elements are divided into:

The difference between the first two types only in the method of clamping bits. In a fast.Packed cartridge, the shank is twisted and pinched manually. In modern droplets and screwdrivers, clamps are used to fix shanks with a diameter of 0.8-25 mm.

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The BZP type device consists of these details:

BZP heads are divided into one.Button and two.Lump. The first type is used in screwdrivers with a lock. Thanks to it, the clamping device can be scrolled with one hand, since the second part of the body is fixed motionless. Both hands are involved with two.Different cylinders.

In a selfless sleeve, a bit with a drill is automatically clamped during scrolling. The risk of turning the drill when working with such a screwdriver almost zero. When weaken and clamping cam clamps, the device makes a clicking sound.

It will not work to tighten the cam cartridge-you need a G-shaped key. It is inserted into the groove perpendicular. Type of GDP, that is, a gear-cage cartridge, is considered less convenient to install, but gives a more reliable clip of bats. This is a variety of clamping cylinders of the cam type. Such a head consists of three main elements. A cylindrical body, rotating the outer ring and the internal cam mechanism. The mechanism made of strong steel is 3 fists, which when rotating the ring close together.

How to extend the life of a tool?

If the screwdriver is acquired seriously and for a long time, it is better to pay attention to popular brands. Here are a large number of service centers, and available spare parts. But, like any mechanism, a screwdriver needs in care and timely maintenance.

First of all, the tool should be protected from dust, dirt, falls and adverse weather conditions. Always use your native Zh (charger). Constantly disabled rattle will lead to Rapid wear of a restrictive coupling. In the same time Long work rattles will not lead to anything good.

Store a screwdriver according to the instructions. It is desirable to put the tool Vertically, To prevent the fall. Before starting work, both batteries are charged, provided that there is a second in the kit.

Dismantling

Scurgets are understood in compliance with a certain sequence:

  • The battery is removed (if it is provided by the design of the product).
  • Removing the screws connecting the two parts of the case.
  • The upper part is removed.
  • The contents are extracted.
  • The button is disconnected.
  • The speed switch is removed.
  • The engine, gearbox, adjusting coupling and cartridge is disconnected.

Possible electrical malfunctions

The malfunctions of the electric part of the Bosch grinder can conditionally be divided into simple and complex.

Simple malfunctions of the electric part of the Bosch grinder

If you turned on the grinder, and she refuses to work, start looking for a malfunction from a break of the power supply wire. Most often, the wire break is manifested at the entrance site to the grinder or into the fork. Do not allow twist, this will lead to a short circuit in the tool.

To determine such a malfunction, it is necessary to open the lids of the handle of the grinder. In Bosch grinder up to 1000 watts, the lid is attached with one screw in the end. Bosch Bosch over 1000 watts of the handle cover is attached with several screws.

Using a tester, call the power circuit from the entrance fork pos.5 before the switch. With a whole circuit, go to check the circuit breaker. Bosch grinders use simple circuit breakers controlled by the switching lever.

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But the electrical contacts of the switch are burned and become the reason for the failure of the grinder. It is impractical to restore contacts of a plastic switch, you need to change it to a new.

If the switch is intact, using the tester, check the presence of the chain from each pin of the fork to each charcoal brush.With entire circuits of the grinder, the. If it does not rotate, then the malfunction by the mechanical part. It is possible to jam the gears or destruction of bearings.

Checking the electric motor

If your Bosh Bosh Bosh is gaining momentum, regardless of you, begins to warm up, sparkle, you need to pay attention to the integrity of the rotor windings, stator. An involuntary set of speed of Ushm indicates a malfunction of the stator windings

The integrity of the windings is checked by the tester, and a short circuit between the turns is checked by a special device

An involuntary set of speed of Ushm indicates a malfunction of the stator windings. The integrity of the windings is checked by the tester, and a short circuit between the turns is checked by a special device.

How to determine the rotor malfunction

Rotor repair is a complex technological process available to masters with straight hands.

The rotor malfunction is indicated by the drop in engine speed, the appearance of a long sparkling trace in one of the brushes. This is the first sign of a short circuit of the turns of the anchor winding.

The rotor repair is preferably carried out in special workshops. And you can rewind yourself if you decide to repair Bosch grinder yourself.

The dark color of the rotor winding and the burnt lamelons of the collector indicate a short circuit in the rotor chains. The malfunction is eliminated only by replacement with a new rotor.

Stator repair

Repair of the Bosch angle grinding machine includes the restoration of the stator. The main sign of the failure of the stator is a spontaneous increase in the revolutions of a working grinder, which cannot be reduced by adjustments.The burnt stator winding changes color, it becomes darker. The core of the stator from high temperature also darkens.

The stator is easier to rewind, although here you need to follow certain rules and sequence.

If you removed the cover of the stator case, carefully inspect the condition of the coal brushes and the lamella of the rotor collector.

The length of coal brushes should not be less than 8 mm. By the way, coal brushes with a “shot” are used in Bosch grinder, a device that stops the operation of a grinder with a minimum length of a coal brush.

The collector lamps should not have traces of carbon or wear. The carbon car is easily removed using a cotton swab moistened in alcohol.

Malfunctions of speed controllers

In the Bosch series, especially low power, the rotation frequency regulators are installed. Access to the regulator of the rotation frequency is carried out by opening the stator body handle holding on one end screw.

The range of rotation of the regulator can be set by a potentiometer hidden in the handle panel.

The faulty regulator is removed quite easily, since it is attached only on the guide.

Repair of the Ushm revolutionary control regulator is a complex process, the implementation of which requires not only special knowledge, but tools and equipment.

If the revolution regulator fails, but there is no new one, then disconnect the supply wires and install the jumper.

Red shows a jumper installed when the revolutions are exiting the system.

In what cases is it necessary to repair

The most common reason for the breakdown of the screwdriver, in which you have to remove the gear, is the burned engine. It is possible to solve the problem only when buying a new motor. If the user selects the spare part with the factory gear, then it may not approach the gearbox installed on the unit. Experts offer an optimal exit from the situation. To carry out the procedure for removing the node from the old engine, followed by fixing it on a new.

Gear under the gearbox

The need to extract an old gear indicates the scroll of the cartridge during the operation of the tool. Such a problem is often associated with wear of the gear wheel of the motor, which ceases to cling to the gear of the gearbox. In this case, extraneous noises appear in the mechanism responsible for adjusting the torque, speed. Large jerks or slippage can also be observed during spindle rotation.

Metal gear wheels are also not subject to repair, since their size is very small, attach reliably falling away cloves. The only way out of the situation is to buy a new part. After replacing, the spare part must be carefully lubricated, which will positively affect its service life, will ensure the smooth operation of the mechanisms.

disassemble, motor, screwdriver, adjustment, rotation

Diagnosis and elimination of malfunctions of the electrical part of the screwdriver

If you have a battery device, then the first thing you need to check the batteries in the battery block by dismantling it. There are collapsible and non.Vegetable blocks. In the second case, you will need to carefully insert the screwdriver into the place of gluing the walls of the block and, slowly, disconnect them.

Further, it is necessary Measure the tension On all “banks”. The voltage rating is indicated on the body of each battery. The voltage should be slightly lower than the indicated, but the same on the working batteries. Faulty batteries will differ significantly from the rest in the voltage issued. They will need to be replaced. New batteries can be purchased on the Internet.

disassemble, motor, screwdriver, adjustment, rotation

If you are the owner network screwdriver, then the test algorithm is slightly different. At first, you need to promote the body of the apparatus and remove it one half. Take the tester and “call” the power cord for a cliff. In the case of a good cord, you need to check the start button. Check with a button pressed if there is a circuit on the output of its contacts. If the button is faulty, it will need to be replaced or repair. How to do this will be considered later. With a good button, the problem can lie in electrographs or engine.

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Repair button

Below is the electrical circuit of the battery screwdriver.

It shows from the diagram that 2 wires from the battery are suitable for the button, and 2 wires to the engine come out of it. Also, 3 wires from the transistor responsible for adjusting the revolutions are connected to the button. To understand the device of the screwdriver button, it must be disassembled. All wires going to this details can not be soldered. They will not interfere with disassembly.

Remove pressure mechanism (red) from your seat. Do this with neat rotational movements, while pulling the part in the opposite button, making sure that the joke does not break.

Next, remove button cover. In the places indicated in the figure with arrows, with the help of a knife and screwdrivers, you need to put and push the latches, then remove the lid.

Removing the lid, you will see Reversion compartment. But the button mechanism will still be unavailable. Using the soldering iron, disconnect 2 elements (the next figure is indicated by the arrow).

Gently pull out the element under number 1, then remove the cover that closes the compartment with the mechanism for turning on the device.

Holding the return spring, take out the mechanism from the body.

In a faulty button, you will see the erased contact sites.

Contact sites quickly wear out due to the poor quality of metal. Small metal dust from the cooked contacts accumulates between them and closes the platforms. As a result of this, a spontaneous launch of the apparatus occurs.

With the help of a cotton swab moistened in alcohol, remove metal dust. If this fails, you can scrap her with a knife. After these actions, the spontaneous launch of the device will stop.

Replacing brushes

To check the condition of the brushes, it is necessary Disassemble the engine, Bending the “antennae” located at the end of the case.

Next, with light beats of the hammer on the engine shaft, knock out the rotor from the body.

In this case, the cover in which the electric shows will be removed first.

The next photo shows that the collector has black color. This means that it will pollute the dust from the brushes. As a result of the pollution of the collector, as well as the grooves between its plates, the engine power drops and the brushes sparkle. It is necessary to wipe the collector with cotton wool moistened in alcohol, and clean the grooves with a needle.

The following photo shows what a clean collector looks like.

If the brushes are worn out, they will need to be changed. It is difficult to find some models of screwdrivers on sale on sale Original brushes. But you can find brushes suitable in size, after which on a sharpener to trim them and connect (solder) to the brush holders.

Finding the cause of the breakdown and its elimination

The final breakdown of the tool is often accompanied by preliminary events, paying attention to which you can prevent a serious malfunction: the appearance of extraneous sounds, sparking, smells of burning, increased vibration, fast battery discharge.

By dismantling the device, you can understand which knot is faulty. All devices are divided into two types:

Each type is characterized by their primary signs, by which a damaged part is easily calculated. A special family includes malfunctions associated with the battery. The nature of the breakdown is due to the fact that the battery is quickly discharged, or the device does not want to start at all.

The battery is disassembled by withdrawing its latch from the grooves. Under the casing are elements with a capacity. Their connection is made by contact welding. A multimeter can measure the voltage value on each bank. The normal value of the charged element is 1.2 volts. Faulty elements are removed. For this they are carefully bought by nippers at the contact site, and similar ones are installed instead of them. If there is no welding, it is possible to use the soldering iron. Then the battery must be assembled and installed in a screwdriver for verification.

But the problem is not always related to the battery. For example, when repairing a screwdriver Bosch with your own hands, damage to the charger circuit (ZU), not a battery, is often detected with your own hands. Repair of the item consists in calling the radio elements. First of all, the network fuse and rectifier bridge are checked.

Usually, when opening the body housing by external signs in the form of blackening of radio elements or a textolite board, you can immediately see which element requires a replacement. Most often, transistors that are located on the radiators and the operational amplifier come out of the system.

Xiaomi Wowstick Electric Screwdriver. Disassembly

Damage to the electric part

Most often, the malfunctions in the electric part are associated not only with the inability to turn on the tool, but also the lack of switching into the reverse mode or the ability to adjust the speed.

If the battery is serviceable, and when connected to the screwdriver circuit, the voltage on its terminals drops, then this indicates a malfunction in the elements of the device motor. If the voltage is normal, the button is checked. To do this, the tester switches to the call mode and its probes are installed parallel to the button. When it clicks it, the multimeter should issue a squeak, otherwise the non.Working button. You can try to restore the part independently by cleaning its contact groups.

Reversion checks also using a multimeter. One probe should touch the button entry, and the other to the contact of the electric motor. When switching a reverse, resistance should occur, if it is absent, then damage should be sought in the wiring. If the engine speed adjustment does not work, then the breakdown is associated with the control transistor or button.

Checking the electric motor brushes is visually carried out, their wear should be no more than 60 percent. If everything is in order, you should check other engine elements. To measure the resistance of the windings, the engine contacts must be disconnected from the rest of the circuit. With a cliff, inter.Trough circuit or closing on the housing, the winding will need to be rewound. The anchor is also checked in the same way. To measure its resistance, the probe probes are installed on the collector plates. The resistance value should be zero. If the winding cannot be repaired, you have to purchase a new engine.

Electric malfunctions also are considered sparking and crackling during operation. This is due to the wear of the brushes or the slow rotation of the collector due to its blockage.

Malfunctions in mechanical nodes

If extraneous sounds appeared during operation and the wedge of the device occurs, then this indicates the wear of bushings or bearings. After disassembling the gearbox, it will become clear that it could break. Uncharacteristic noise can also form with shaft deformation. Such a breakdown also manifests itself during the beating of the cartridge. If tightening weakens in the cartridge, then it is necessary to check the coupling for wear. When working the tool, the teeth wear out, and the coupling begins to scroll through.

To avoid breakdowns in the gearbox, it is necessary to periodically serve it. To do this, it is recommended to lubricate all the rubbing mechanical parts, preferably removing the remaining old lubricants in advance. The clogging of the structure can also affect the turnover of the tool.

Extraneous sounds can be characteristic not only due to damage to the gearbox, but also caused by the engine. Noise occurs with a torn magnet or with wear of the anchor bushings. To restore the anchor, you can try to lubricate it with machine oil.