DIY electric wrench repair

Many articles have been written about pneumatic tools, their advantages, device, and operating features. As a rule, the information provided in them is limited to general information and recommendations. In this article, we will try to tell you in detail about the features of the preparation of an air line and the main mistakes made by users.

So, you have acquired a pneumatic tool. What must be done in order for the instrument to serve for a long time and function according to the characteristics declared by the manufacturer, and what should not be done in any case?

It is clear that the pneumatic power tool is powered by compressed air. But what are the basic requirements for this air?

Air quantity should be sufficient for the full operation of the tool.

Carefully read the instructions for the product you purchased. The manufacturer must indicate such an important parameter as the average cyclical air consumption. As a rule, the pneumatic motor is rather "gluttonous". The compressor that you are using must have sufficient capacity, and its receiver must be large enough so that the instrument does not “blow out” it in a few tens of seconds. For example, an attempt to use a wrench with an average cyclic flow rate of 120 liters per minute in conjunction with a household compressor with a receiver volume of 24 liters will not lead to anything good. And a compressor with a receiver capacity of 50 liters is unlikely to allow full use of the wrench. It will last for a few seconds of normal operation. After that, the pressure in the system will drop, and the wrench will not develop the required force. Also, every minute switching on of the compressor operating at the limit of its capabilities will lead to its rate of wear and failure.

Next, you should pay attention to pipes, hoses, adapters and other elements of the system through which air will flow to the tool. It is important that the duty cycle of the channel is sufficient along the entire length of the pneumatic line. The constrictions will limit the amount of air supplied and the tool will operate at half strength. It is desirable that the duty cycle of the channel is not less than the diameter of the inlet of the choke through which air enters the tool.

System pressure... Most pneumatic tool manufacturers recommend setting the system pressure to 6.2 kg / cm². If the pressure is lower, the tool will not deliver the required power. Too high pressure will lead to premature wear of key components and tool failure.

How to set the pressure correctly using the regulator? Connect the tool to the pneumatic line. Using the regulator and pressure gauge, set the system pressure to 6.2 kg / cm². Press the power button of the tool, the tool should be in idle mode. With the tool switched on, set the system pressure to 6.2 kg / cm².

Air quality... The air must be free of foreign matter that could damage the instrument. When the air is compressed, condensation forms inside the receiver. When the compressor is severely worn, oil also enters the receiver. Mixing with the moisture of the condensate, the oil forms an emulsion, which enters the air motor through the pneumatic line and causes corrosion of its parts.

In practice, I had to repeatedly deal with nutrunners arriving at the service center, the interior of which was filled with water and rust.The impression was that the wrench had been drowned in a swamp for at least a year. It is surprising how in such conditions he was able to work for so long.

The filter drier allows you to solve the problem of air purification. A foamed bronze mesh is installed inside the filter. Passing through it, the air gives off moisture and other impurities, they settle in the sump. The filter housing is usually made of transparent material, which allows you to monitor the amount of accumulated contamination. A valve at the bottom of the sump is designed to remove them. It happens that in the presence of strong contamination, the bronze filter element becomes clogged and cannot provide the required air flow rate. A typical symptom will be a drop in the power of the instrument. After starting, the engine starts to work at the proper speed due to the air accumulated in the hose, but after a couple of seconds it slows down, because the filter does not allow air to pass through in the required volume. Remove the filter housing and wash the filter element in solvent, blow it with air. If this does not help, the filter element will have to be replaced. They are sure to be in the assortment of companies supplying pneumatic tools and pneumatic preparation system elements.

Air motor lubrication.

Lubrication plays a decisive role when it comes to the operation and life of the pneumatic power tool. Oil not only reduces friction between the moving parts of the engine. Its main role is to remove wear products. When the rotor blades rub against the cylinder walls, the finest dust is formed. It fills in the miniature gaps between the rotor slots and the blades. The blades stop moving freely and the motor loses power. I'll reveal a little secret. When a tool that does not develop power arrives at our service department, an experienced mechanic fills the cavity of the motor with penetrating grease, injecting it through the air supply connection, and leaves the tool for several hours. Lubrication flushes contaminants out of the engine clearances. After that, you need to thoroughly blow out the tool with compressed air, and it is again ready for use. In almost half of the cases, this technique works.

How to properly lubricate the tool? The lubricant is supplied to the tool motor along with compressed air. For this, a device called a lubricator is installed in the pneumatic system. Oil is poured into the lubricator through the hole in the upper part. The transparent body, marked with minimum and maximum level marks, allows visual inspection of the presence of oil in the system. When supplied, the air is enriched with a suspension of oil, which flows through a hose to the tool. In practice, it is convenient to use an air preparation unit called a modular group. It includes a filter drier, lubricator, pressure gauge, pressure regulator and is installed directly in front of the hose to which the pneumatic tool is connected.

It should be borne in mind that with a hose length of more than 10 m, the oil flow to the tool will be difficult. It will require the use of additional linear lubricators installed directly on the inlet connection of the tool.

Use only special oil for pneumatic tools with the appropriate viscosity. As a rule, companies offering pneumatic tools have it in their assortment.

In practice, one has to deal with situations when consumers use engine, transmission oil. It happens that fluids that are not at all suitable are used. Our service center received a wrench, the motor of which was filled with a substance resembling furniture varnish in smell and consistency. High viscosity oil "sticks" the engine blades and does not allow it to develop power. The harm from such a lubricant will be more than good.

With intensive use, it will not be superfluous to additionally lubricate the tool. It is not for nothing that there is an inscription OIL DAILY on the tool handle next to the air supply connection.

Before starting work, inject a few drops of oil (but not too much) through the air inlet. Your instrument will be grateful to you and will serve you for many years!

• The principle of operation of a pneumohagakert
• Types of faults
• Disassembly of the pneumatic wrench
• Repair of pneumatic impact wrench
• Lubricant for pneumatic impact wrench
• Conclusion

The pneumatic wrench is an indispensable tool for working with threaded connections. It is widely used in car services and numerous construction works. Perfectly tightens nuts and loosens tight connections.

The design of a pneumatic impact wrench is quite simple, but at the same time it consists of many details incomprehensible at first glance. Often, the parts of the mechanism have sufficient strength for a long service life and fail only due to wear or increased stress. Most of these problems can be detected at home without the need to contact a specialist. How to determine the location of the breakdown and fix the malfunction, we will tell you in this article.

To understand the reason for the breakdown of a tool, you should understand how it works (fortunately, the mechanism is very simple here). The pneumatic wrench consists of a fitting to which the air hose from the compressor is connected. Next is the start button, which directs the air flow into the cylinder with the rotor and blades, spinning high pressure. The motor transmits rotational movements to the stop, where the attachments for tightening the nuts are installed. If the impact wrench, then between the stop and the rotor, the impact mechanism is located.

For greater clarity and understanding of the wrench device, below are photos and videos of the tool in analysis.

Breakdowns or malfunctions of the nutrunner can be caused by wear, damage or severe contamination of its mechanism. There are many video faults, below we list the most common ones.

1. Low power even at maximum speed and high pressure.
2. Speeds or reverse are not working.
3. The instrument is warming up
4. The chuck does not rotate
5. Increased noise and vibration

Parts such as bearings, rotor blades, valves, springs, impact cams, gaskets, and speed control can be the cause of these problems. Depending on the level of damage to the part, it can be repaired or replaced. Let's take a look at how you can bring your impact wrench back to life.

Usually, this process does not cause any particular difficulties, due to the simplicity of the tool design and the minimum number of unscrewed elements. The first thing to do in order to get to the “guts” is to unscrew a few bolts on the back cover with a hexagon. After unscrewing, remove the cover with the gasket and the speed regulator. Having gained access to the main mechanism, we carefully remove it from the case, be sure to remember the sequence of parts. If you are afraid to mix up the parts when assembling, shoot the disassembly in a photo or video.

After taking out all the parts, the first thing we need to do is evaluate their appearance. Parts must be lubricated, free from rust and oxidation. Next, we need to look at the mechanism for chips. If parts are damaged, they must be replaced. You can read the name of the pneumatic wrench parts in the picture above.

If your tool has been out of use for many years and before the malfunction it has not been used for a long time, then perhaps the cause of the breakdown lies in banal corrosion and rust formed on the mechanism for a long time of inactivity of the tool. The solution to this problem may be elementary cleaning of parts with subsequent lubrication.Even if this method does not return your tool to work in order to work in the future, it should not be dirty and without lubrication.

The tool may not function or function improperly even with a clean, lubricated mechanism. In this case, the cause of the malfunction lies clearly in the breakdown or wear of a certain part. Here you should carefully examine each component for chips, cracks or abrasions. More attention should be paid to the bearings and rotor blades, as these are the most prone to mechanical damage.

You should also carefully inspect the cylinder block and make sure that the rotor blades fit snugly against its walls. This happens when the wrench runs for a long time without oil, as a result of which the rotational force decreases significantly. If there is a clear backlash, you have 2 options for repairing the pneumatic impact wrench: installing a new block or grinding the old one. Grinding is required on the machine for a perfectly flat surface.

The service life of any power tool largely depends on the quality of lubrication of its parts. The easier the mechanism is to operate, the less wear and tear will occur. If you want the wrench to serve you faithfully for more than one year, follow the basic rules for maintaining the tool.

To add oil to the wrench mechanism, you do not need to disassemble it. It is enough to add about 8-10 drops of grease to the tool nozzle where the air hose is installed, then start and let it idle for 30 seconds so that the oil is quickly distributed over the parts. This procedure should be repeated every 3-4 hours during continuous operation, as well as before putting the tool away for storage.

If you use the tool all the time, adding oil every 4 hours can become a chore. To eliminate unnecessary distractions from your workflow, install a wrench oiler (lubricator) that will deliver oil gradually as you work. This method is more convenient and provides constant lubrication of parts, just remember to add oil to the lubricator itself.

An electric wrench is a tool designed for assembling or disassembling a variety of threaded connections. Most often, the device is used in cases where it is impossible to get by with a standard wrench. Unlike the manual model, the electric impact wrench allows you to get work done much faster, while spending a minimum of effort. However, if necessary repair of electric wrenches it is best to trust the professionals.

Modern wrenches are complex devices consisting of many component parts. Failure of one such unit leads to a malfunction of the entire device. Most often repair of electric wrenches caused by the following problems:

• Failure of the electric motor, which overheats during intensive work.
• Ingress of foreign objects, such as metal shavings, into the device. This leads to loosening of the internal mechanical parts of the tool.
• Bearing wear.
• Damaged power cord or plug.

Most often, wrenches contain weak motors and to avoid overheating, it is necessary to take breaks when working with the device.

The specialists of our service promptly and efficiently carry out repair of electric wrenches... After diagnosing the device, the problems that appear are eliminated, and if necessary, individual units are replaced. Also, our technicians are always ready to clean, calibrate or lubricate the wrench, which has a positive effect on the operating period of the device.

AEPerson - power tool repair in Moscow, Zelenograd at the lowest prices.

Hello everyone! Surely you know what a wrench is and what it is for.This is a device that is used in everyday life, in construction, for trucks and passenger cars. Since we have an automobile site, we will talk about wrenches designed for car wheels and other nuts and bolts on a car.

Agree that using a conventional socket head is problematic to unscrew rusted and stuck fasteners. It is not necessary to buy professional units for tire fitting. In an ordinary garage, for those who are used to doing minor car repairs with their own hands, such tools will be indispensable.

If you look at the external characteristics, the wrench, like the screwdriver, resembles pistols. They have a handle, a barrel where the working mechanisms are located, as well as a spring and a cartridge. The latter is of the clamping type.

When power is supplied to the motor, rotation begins. Energy is transferred through transmission and rotates our gearbox. Please note that not every model offers the ability to unscrew the nut. Some just tighten the fasteners.

The unscrewing functionality is present where there is an additional spring. It allows the gearbox to move in the opposite direction.

The chucks are available in different diameters. His choice depends on the purpose for which you choose the tool. For example, ½ "is suitable for domestic use, while the larger ones are focused on building, assembling cars and repairing them.

An impact wrench is a hand tool that allows you to repair and service the machine yourself. At the same time, it is difficult to determine which of them will be the best specifically in your case. Today manufacturers offer the widest range of impact wrenches, which have a different drive, size, principle of operation and other characteristics.

Yes, you can go to the store and buy something from the range of leading auto tool manufacturers such as:

On Avito and in other regular and online stores in Moscow and St. Petersburg, the assortment is huge. You can take a used and a new model, depending on how much money you have and how much the price matches the possibilities.

But here you are asked what kind of device you need. And what do you answer? One that can be screwed in, unscrewed the nuts? No, that will not do. We will expand our horizons and get acquainted with the existing types of impact wrenches.

All existing wrenches are divided into several types:

• rechargeable;
• hydraulic;
• pneumatic;
• electric.

Yes, there is also a mechanical unit designed to work only due to muscle strength. But it is not powerful enough and energy-consuming. It is difficult to work with him, because this is some kind of meat grinder with a similar principle of operation. You need to rotate the handle with your hand and hope that your strength is enough to move the tightly rusted thread. Therefore, I see no reason to consider such a version of the wrench.

But let's go over the rest separately.

Their main characteristic and advantage is autonomy. No connection to wires, cables or hoses is required. This allows you to work in remote areas and not depend on outlets.

A good option for minor repairs. It does not allow you to work on a single charge for too long, but if you are not going to use it for hours, it will be enough for several basic tasks.

The shock-impulse principle of operation gives excellent results. When choosing a battery model, rely on several characteristics:

• Torque. Its maximum value indicates the effectiveness of the instrument. Sold in the range from 100 to 500 Nm. The higher the indicator, the more complex nuts the tool can handle;
• Capacity and voltage. Very important data for the battery type. Determine productivity and battery life;
• If the head is an impact head, look at the frequency of those impacts. The average is 3000 beats per minute.Impact models are the most productive because the spin is created from powerful impacts. This increases the torque;
• Battery. The more powerful the device is, the heavier the battery will be.

They are accompanied by instructions for use, in which you will not find anything complicated.

An electric or network impact wrench has a high performance. Therefore, it is often used in large industries. The power is higher than the previous version, but the mobility is lower.

It is an impact wrench with a huge torque (KM). They work on twisting and unscrewing, which is often necessary for craftsmen. When choosing, rely on:

• torque;
• dimensions of the used cartridge;
• dimensions of fasteners.

For light work, an M16 and about 250 Nm will be enough, and for complex operations, an M600 and about 600 Nm will be required. For trucks - about 1000 Nm and fasteners for M30.

Pneumatic is most often used at service stations and car services. It has an excellent tightening torque, quickly completes the assigned tasks, unscrews and tightens fasteners.

Looks like a pistol with a trigger. A compressor is connected through a hose, and air is supplied to the wrench. It is better to choose a device in a metal case than in a plastic one.

It functions by means of compressed air supplying force to the head. With the help of a special screw, the master regulates the supply of compressed air, which simplifies the operation. The air wrench has a number of advantages:

• a useful device where there is no access to electricity;
• there is no motor, which significantly reduces the weight of the tool;
• there is a quick reverse function to change the movement of the head;
• extensions and heads allow you to work in hard-to-reach places, turn the tool into an angle one;
• requires a compressor;
• the torque can be from 30 to 3000 Nm.

A great option for those looking for a lightweight and easy-to-use device. This is confirmed by the reviews of the owners of such impact wrenches. Jacked up the car and got to work.

An important advantage and distinctive feature is the ability to control the parameters of the CM. A hydraulic pump and a distributor act as a drive.

The hydraulic cylinders of the devices develop forces from the translational movements of the installed pistons, which are converted into CM. It is transmitted using a ratchet wheel.

Such impact wrenches have the highest torque, surpassing all competitors and reaching several tens of thousands of units. In garage conditions, there is no need for such a tool.

Now, briefly about how to choose the right option. There are several criteria to rely on here.

• Power. The higher it is, the more difficult the tasks can be done. Professional ones have power up to 1300 W;
• Torque. A very high parameter is not needed for car repair, otherwise you can only do harm. Usually, devices with a torque from 160 to 600 Nm are used;
• Turnovers. Affect the speed of rotation and operation of the selected tool. If you need to twist-twist a lot and often, choose models with high speeds;
• Impact or unstressed. Unstressed are used by beginners and such a system is available on the cheapest devices. The drums are better and more powerful, so I would recommend taking them.

Rely solely on the tasks you have to accomplish. There is no need to chase expensive and powerful impact wrenches, because in the real conditions of servicing your machine, these parameters will turn out to be prohibitively high, and you will not be able to work normally.