Electric chain saw malfunction. Typical breakdowns in electric saws and methods for their repair. ElectroLux electric saw repair

Today there is not a household that lacks such an assistant as an electric or gasoline chain saw. This tool significantly reduces labor costs and is indispensable when performing heavy physical work, such as felling trees. Below we will look at its structure, describe the main elements, their malfunctions, and compare some modification options from the experts.

Electric saw diagram

This figure shows the general design details of an electric hand saw.

Spare parts for electric chain saws

Today on Russian market There is a wide variety of spare parts for electric saws. These include sprockets, saw bars, chains, various oil pumps, drives and flanges. The prices for these items are very affordable: the main line of products offered falls within the price range of 1–10 USD. e. The master using this tool, in some cases, must be able to independently repair or replace a failed part. Let's talk about this below.

Smooth start on the saw

The manufacturer does not always provide the possibility of a soft start, which is why the engine starts working immediately at maximum speed. At the same time, he still needs to spin the working body to the required speed. This mode is very difficult for the instrument; there are often shocks when starting up. To make the tool work normally, you need to purchase a soft start module costing 3–5 USD. e. and install it into the tool body. First you need to open the housing cover by unscrewing the mounting bolts. The soft start module has two wires that should be connected to the power supply going to the power unit. Holds this module up to 2 kW. After this, you should assemble the tool body in reverse order.

Oil pump for electric saw

An oil pump is necessary to automatically lubricate the chain during operation. The oil exits the pump through the oil channel opening. Oil is supplied from the oil tank to the oil pump socket channel, and then the chain is lubricated. The pump is driven by an eccentric cam on the gearbox shaft. The pump consists of a body, a plunger, a valve seat, the valve itself and a plug. A bar and a lock nut are used to secure the oil pump to the housing.

Electric saw chain sprocket

Most sprockets are not interchangeable. Their main difference is in the inner and outer diameter of the clutch plate, the fit on the crankshaft, and the overall height of the sprocket. It is important what chain pitch they are designed for. According to their design, they are divided into all-metal and collapsible types. If the all-metal and collapsible sprocket wears out, you will have to replace the first one entirely. Using a collapsible type sprocket in a chain saw is the most economical solution.

Rotor for electric saw

The armature is represented by a winding of copper wire that passes current and magnets surrounding the rotating shaft. There are two main parts in the armature - the rotor (moving element) and the stator (fixed, static element). The shaft is rotated using electromagnetic field, arising during the start-up process electric current through copper wires and its interaction with the magnets located there.
To choose an anchor for a power saw, you need to know the dimensions of some elements. It is necessary to measure the following places using a caliper: the diameter of the winding, the total length of the armature, the length of the commutator along the lamellas, the diameter of the commutator, the bearing seats - rear and front, the distance between the bearings along inside. In addition, you need to pay attention to the end of the shaft - whether it is made in the form of teeth or is it a truncated cone. Knowing these parameters, you can select an anchor, since you should not become attached to the model or its other characteristics.

DIY electric saw repair

Like any tool, a chain saw is subject to wear and tear. For initial diagnostics, the technician should pay attention to the following failures that occur while working with the tool:

If it is impossible to turn on the tool, check the condition of the cable and its connections to the housing.
Then you should pay attention to the chain stopper, changing its position if necessary.
When power decreases, the tool should be inspected for brush wear.
If extraneous noises or sounds occur, you need to look to see if the oil-conducting channels are clogged. If necessary, clean them and add oil to the required level.
If the case is damaged, the instrument cannot be repaired at home - it must be taken to a service center to have the defect eliminated.

Remaking a power saw

You usually think about modifying a chain saw when something is missing. For example, a milling machine. To do this you will need:

welding machine;
adapter for cutters;
flat steel roller;
gearbox

The procedure is as follows. Weld a wheel at the end of the boom base, cutting the boom so that the wheel fits exactly into the cut contour to prevent tension or weakening of the chain. A removable adapter to the cutters is attached to the wheel.

We hope that, having familiarized yourself with the information briefly presented in our article, you will be able to independently eliminate minor malfunctions that have arisen and operate this tool as a confident user.

Like any tool, Makita electric saws require maintenance. From time to time it is necessary to replace those parts that have become very worn out. This applies to any product in the line, be it the Makita UC3520A with a motor power of 1800 W or the UC4530A with a motor power of 2000 W. If you do not pay attention to some points when inspecting and preparing the saw for work, the device may even break.

Preparation is carried out in several stages:

Since the device is quite massive, for example, the UC4530A weighs 4.3 kg, we place it on the table and use a special wrench (supplied) to unscrew the fastening nut. Then remove the sprocket boot.
Scroll the bolt with which the chain is adjusted in the direction opposite to the movement of the hand on the clock. The pin should go into the leftmost position.
We pass the chain between the gear teeth and wrap it around the sprocket. At the top of the tire, the teeth should be in the direction of the arrow.
We put the tire back. The pin must fit exactly into the tire hole.
Reattach the sprocket cover and lightly tighten the fastening nut by hand.
Check that the saw chain is properly tensioned. To do this, lift the end of the bar, then turn the chain screw to adjust, now in a clockwise direction. Be careful that the chain should be pressed tightly against the bottom of the bar.
All that remains is to lubricate the tire thoroughly and saw chain. To do this, you need to use special chain oil that has an adhesive additive and is biodegradable. The additive prevents liquid from being thrown out. Oil must be filled to the lower level of the filler neck. Make sure that no dirt gets into the oil tank. To do this, clean the filler neck before filling.
Screw the tank cap back into place. Turn on the saw and let it run without load for 2 minutes to gradually lubricate the chain mechanism with oil.

Having completed all stages of preparing the makita uc4030a saw for work, carefully wipe it from any remaining oil. Do not use mineral oils under any circumstances, otherwise you will have to breathe in harmful fumes while working.

Review: Makita UC3503A electric chain saw - Useful, reliable, ergonomic device

Advantages:

Convenience, ergonomics, elegance and reliability

Flaws:

Chain and blade lubrication required

When there is a substantial garden at a summer cottage, when you have to prepare firewood for a bed on autumn-spring periods when you have to do construction work at the dacha, it is advisable to have good saw. Of course, you can get by with a regular two-handed saw, but this is currently not productive. Therefore on family council It was decided to buy a manual electric household chain saw.

Power saw Makita

Were viewed on the Internet various models such devices from the most famous brands. The choice fell on the Makita company, although it was more expensive than the same saw from other companies (10,000 rubles). When I picked up this saw for the first time in the store, I realized that the choice had been made correctly.

The elegant shape, good alignment, comfortable and reliable grips for the hands, which force the body to be positioned in the safest position in relation to the cut, and protective devices that increase the safety of work emphasized the high qualities of the saw. The very shape of the saw clearly demonstrated the aggressive dynamics of the saw. She didn't want to let go of her hands.
I've been using the saw for over five years. There are no complaints or comments about the operation of the saw, although at first it seemed too fragile. Practice has confirmed its reliability. Maintenance of the device is very simple. Don't forget to add oil to lubricate the chain and periodically sharpen the chain. I have two chains. Therefore, when I feel some cutting heaviness, I simply replace the dull one. cutting chain and turn the saw blade 180 degrees. Replacing the chain is very simple using the key supplied with the saw. If the chain starts to heat up, you need to clear the sawdust from the space where the mechanical drive gear is located, which rotates the cutting chain. During the sawing process, it is necessary to avoid jamming (pinching) of the chain in the cut.

Electric saws Makita (Makita)

Makita UC3530A in our store: https://www.klondayk.com.ua/ru/products/details/elektropila_makita_uc3530a/index.html

The Makita UC 3530 A universal electric saw will come in handy on a personal plot, garden or construction site. This model is characterized by high performance, reliability and durability, and in addition to this, it is very comfortable to use. The electric saw is equipped with a fast-acting device for tensioning the chain and removing the bar without using keys, which not only improves productivity, but also eliminates the need to constantly carry additional keys.

The Makita UC 3530 A electric saw is controlled using convenient and understandable buttons and levers. Thanks to design features This model is easy to maintain. The use of sealed ball bearings and a special gearbox lubrication system ensures long-term operation of the electric saw without specialized maintenance.

In order to increase the safety of the saw, the developers have provided this model with an inertial chain brake, which protects the user from accidental injury as a result of a “kickback”. This system ensures that the chain stops in a fraction of a second - even before a “thrown” tool can “overtake” the user and cause injury. To protect the network from overloads and to prevent premature wear of the mechanism in saw Makita The UC3530A has a built-in electronic inrush current limiting system.

The Makita UC 3530 A electric saw is equipped with powerful engine with a longitudinal arrangement, providing a high sawing speed of 13.3 m/s. Thanks to the longitudinal arrangement of the motor, the tool is compact and perfectly balanced. Comfortable rubberized handles provide maximum control over the saw during operation. The saw is equipped with an automatic chain lubrication system (the capacity of the built-in oil tank is 0.14 liters), which extends the service life of the saw set and the tool as a whole. Visual level control lubricant carried out through a transparent viewing window.

Chainsaws today find application in a wide range of areas. This relatively simple tool is necessary in everyday life to solve a wide variety of problems. You can order the Makita UC3530A electric saw in the Klondike online store.

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Specifications

Reviews of the Makita UC4030A electric chain saw

Advantages

No tools are required to remove the chain bar. Automatic chain lubrication. Did an excellent job of felling a birch tree 60 cm in diameter. Uses almost any oil, despite the fact that the instructions say to use only oil from the manufacturer. In general, an excellent saw for working in a summer cottage.

Flaws

I haven’t found a single drawback for myself, except that after pouring oil into the tank, it sometimes leaks (not significantly), but is corrected by wiping the neck of the tank and the lid.

Comment
For me, this saw has become an excellent replacement for the Parma M saw (84 year of manufacture). Now you can safely forget about manually lubricating the chain and changing it directly using a tool. The only pity is that the drive sprocket of the chain can only be changed at a service center.
Repotraft, 2010-08-15 Grade 5

Advantages

Flaws

After use, I started cleaning it, and somehow it happened that when I unscrewed the tire clamp, a clamping nut with a spring popped out. I managed to see well where it fell, otherwise I wouldn’t have found it in the grass. Be careful!!!

Comment
I sawed a 38 cm log like a knife going into butter. It works quietly, as it seemed after the gasoline one. And yet, I lost electricity at my dacha. In place of 220 only 170~190. I thought it wouldn't turn on at all. Everything was fine... I didn’t notice any differences from the gasoline one at all!
slovariks, 2011-09-05 Grade 5

Advantages

Weight + weight distribution, convenient to use and maintain.

Flaws

Comment
I bought it about a month ago for my dacha (an average plot of ~20 acres, many trees), and in total it worked for 8-10 hours.
There were no problems during operation. The maximum diameter of the log was about 30 cm, on average 15-20 cm. It bites like butter, saws vigorously, did not bounce once (I had to cut at different angles/positions, including severely violating the manufacturer’s safety recommendations ( extremely carefully).
Easy to maintain! On the Internet I easily found an official catalog of spare parts with a clear diagram - you can change all the consumables yourself if you suddenly need it during operation (a relative of Makita 3501 has been working year-round for many years to prepare firewood for a bathhouse, they forgot to pour oil there (forgot) and nothing ... the tire is original, the chain was changed once, the brushes were not touched)!

4030 uses little oil, but I use thick Castrol Syntrax Universal transmission. For example, a friend’s Makita 4020, according to him, noticeably empties the tank + some of the oil leaks out during storage, which I did not find in the 4030!

Advantages

Very convenient to use. It fits well in your hands and does not slip due to the rubberized handles. Doesn't roar very loudly. At least his ears aren't blocked. The chain moves smoothly and does not jerk. It also does not turn on abruptly. The power is on point - it gets the job done easily. Simple and unpretentious in maintenance. The security system is well thought out. Oil consumption is reasonable

Flaws

It produces really good power only at the appropriate voltage. And sometimes it’s difficult to find in the countryside. But if you, for example, private house, there shouldn't be any problems. Well, I noticed a couple of times that the oil was leaking a little, not much, but still.

DIY chain saw repair

First of all, when choosing an electric saw, you must consider the following: the greater its power, the more reliable and durable it will be in operation. Also, the electric saw will be less sensitive to possible voltage drops, which, unfortunately, are not uncommon in our country.

We will try to consider the most common breakdowns. It is worth noting that they come in varying complexity. For example, if the saw does not turn on, perhaps you should just check the availability of electricity in the network. Or it could simply be that the chain brake is turned on, blocking the operation of the electric saw. Try switching it to a different position. If even after this the tool does not work, you need to check the integrity of the cable and plug for possible defects.

Quite often when used electric chain saw its insufficient power manifests itself, or, to put it more simply, in simple language– the saw “does not pull.” This is usually due to the fact that carbon brushes are highly susceptible to wear. In this case, they simply need to be replaced.

Another fairly popular problem that appears after long-term use of the saw is prolonged stopping of the saw chain. For example, if previously the chain stopped instantly, then over time it takes more and more time to stop completely. This often happens due to the fact that the saw brake band is also subject to demolition and must be replaced in order to avoid the possibility of damage in future work.

Sometimes it happens that during operation the electric saw begins to make an unpleasant sound that hurts the ear. This occurs if there is no oil on the saw chain. The cause of this trouble is most often contamination of the oil supply groove. To eliminate the malfunction, you need to fill the oil tank with oil and clean the oil supply groove from contaminants.

It should be remembered that when performing any of the maintenance operations, the saw should be disconnected from the power supply. The cooling holes must always be clean, make sure to do this! It is recommended to perform independently only those operations described in the instructions. Otherwise the best solution will take the tool to a specialized service center.

When replacing any components of the electric saw, use only original spare parts. When using unspecified equipment, non-original spare parts, or elements of unspecified length in the device, conditions of increased danger are created.

Remember that all types of repairs, as well as maintenance, it is best to entrust to qualified personnel who will do all the work efficiently and in the shortest possible time.

How to repair an electric saw yourself?

- Sequence of actions manual sharpening
- Sharpening a file using a special device

Do-it-yourself electric saw repair is of interest to all owners of such tools. It should be understood that any device has its own degree of wear, so from time to time it will be necessary to repair various faults.

Electric saws received wide application on summer cottages for cutting branches, boards and trees.

Electric saws are indispensable devices in summer cottages or in private homes. They can easily cope with cutting branches, thick boards, as well as various wood blanks. To repair this device, you need to have some skills and equipment. In most cases, electric saws are repaired by experienced professionals. However, there are some types of faults that you can easily fix yourself.

Items that will be necessary to repair an electric saw with your own hands:

original accessories recommended by the manufacturer
files in the shape of circles and ovals
mandrel
caliber
chain sharpening device.

Existing malfunctions of the electric saw

The most common breakdowns are:

Electric saw device.

How to sharpen a power saw yourself?

One of the components of a power saw that needs to be constantly monitored is the chain. It needs to be sharpened from time to time. If you delay this process, you will not be able to repair the electric chain saw yourself. In this case, it will have to be sent to a service center, where sharpening will be done using special devices.

Saw chain lubrication system.

You can extend the service life of the sawing element as follows:

Before starting work, you need to make sure that there are no hard metal elements in the workpiece. If the cutting element comes into contact with a metal workpiece, then jags or chips will appear on the chain that cannot be removed in the future.
Do not sharpen on the ground, as digging into the ground can clog the grooves with oil. As a result, the chain will not be lubricated and will wear out quickly.
It is imperative to monitor the wedge of the saw. Jamming should not be allowed, since as a result the metal will overheat and reduce its service life.

It is necessary to determine whether the electric saw needs to be sharpened. To do this, you need to pay attention to the chips: if they are small or have dark color, then the chain is dull. Blunt edges are not able to remove the required cutting layer; as a result, the chips will be crushed. The quality of tool sharpening can also be determined by inspection. The part used for sawing should not have any defects in the form of torn pieces. The shape of the tooth and cutting edge should be the same as on the unused jig.

If these factors do not meet the relevant requirements, then the saw needs to be sharpened.

If you perform work using a dull saw, this may affect the performance, as well as the period of possible operation of the tool.

If you periodically experience the need for cutting down trees in the garden or in the local area, as well as sawing logs. then you just need to buy a chain saw Stiga SEV 2416 Q. which equipped with powerful (2.4 kW) longitudinal motor. It is this feature that provides the saw with excellent balancing.

You can never overheat saw motor. because it provides its overload protection mechanism. disconnecting the tool from the power supply in the event of an increase in the threshold value of the motor temperature.

Guide bar length this saw has 40 cm (16 inches)). IN Stiga SEV 2416 Q chain (3/8 inch, 1.3 mm, 57 links) tensioned without the use of any additional tools. Provided automatic chain lubrication saws. At the same time, for the convenience of monitoring the oil level in the oil tank, transparent indicator.

Saw at work Stiga SEV 2416 Q is very comfortable. thanks to the shortened rear handle and narrow body. Yes and weight Stiga SEV 2416 Q amounts to only 4.6 kg.

Price of this Swedish instrument is $160 .

DIY Electric Chain Saw Repair.Zip

LARGE DRAFT ON THE CHAIN DRIVE SPROCKET. Unscrew and replace with a new one. We unscrew the spark plug, insert a cord with knots into its opening (we lock the crankshaft), and then in the plate (channel) there are two holes for M6 at the required distance and that’s it - the sprocket is in your hands. At 2150 it can be easier. Without unscrewing the spark plug, hit the clutch with a hammer and screwdriver. It is advisable to first soak the threads a little with WD40. Just don't hit them with your fists. And by the way, the thread is left-handed. Everything is as always - no way without a hammer. Andrik, what about your air filter - foam rubber, like everyone else? what does the filter have to do with it? on the light Poulans they all have foam rubber

It must be sharpened preventively, since if this process is delayed, repairing the electric chain saw with your own hands is no longer possible.

For sawing logs, then you just need to purchase the Stiga SEV 2416 Q chain saw, which is equipped with a powerful (2.4 kW) longitudinal motor.

Gearbox repair video how to make a gearbox with your own hands video repair of electric chain saws with your own hands.

Do-it-yourself electric chain saw repair. First of all, when choosing an electric saw, you should consider the following: the greater its power, the more reliable it is.

DIY repairs. In addition, the electric chain saw has a special container from where oil is supplied to the chain through a filter.

An electric chain saw also has an electric motor, but the working part is a chain with teeth resting on a bar, which are attached to each other by means of hinges. The speed and level of vibration when cutting material depends on the tooth pitch. The chain is set in motion

Do-it-yourself gearbox repair. 10:03 How to choose a power saw, chain oil, sharpen the chain and where to buy?

Do-it-yourself repair of chainsaws and electric chainsaws. The topic in the "" section was created by a user. LARGE DRAFT ON THE CHAIN DRIVE SPROCKET.

ElectroLux electric saw repair

Electric chain saw – indispensable assistant on the farm. With its help, it is easy and simple to build, quickly cut trash into firewood, etc. If only there was an outlet. It is light and comfortable. Of course, you can’t prepare firewood for the winter, but otherwise it’s an excellent helper.

However, there is a weak point of the saw - a plastic gearbox, and a complete lack of any protection from emergency situations, for example from a sudden stop of the chain.

This scenario happened to me - an unnoticeable nail got under the chain - but it was so unfortunate that full speed ahead the chain stood up like a stake, and the motor still spun by inertia.

As can be seen from the photo, the motor gear is metal, but the driven gear is made of plastic; it is unclear what justified this decision.

The abrupt stop of the chain caused the teeth on the driven gear to be cut off.

There is no way to repair it with improvised means; replacement is necessary. Finding a new part is a tedious task. It is not available either in service centers or in other stores. Quite by accident it was discovered and bought for 500 rubles at construction market"Elegant". But this is from the category of “lucky”.

The gear is installed in place, the saw is assembled. Now I inspect the cutting area 5 times instead of three.

Electric saws are preferred for one good reason - they are very light and therefore easy to use. Of course, you won’t go far into the forest with her, - network cable won't let me in. But for use near the house (for sawing logs, preparing firewood, pruning trees, during construction and repairs) the best tool can't be found.

During operation, especially with frequent use, it begins to act up: it makes strange sounds, smells, does not brake on time or does not turn on at all. Nothing can be done - any technical device not forever. And every working day shortens his life. But there are breakdowns that only professional service can handle (for example, the case is damaged). And there are cases when you can revive an electric saw with your own hands, applying effort, knowledge and skill.

We have made a selection practical advice How to repair a saw yourself without contacting a specialist.

Any breakdown does not occur out of nowhere. Its roots often lie in poor assembly and quality, or in improper operation. If you buy quality tool from a reliable manufacturer, it is not so easy to “ruin” it. But still, most often malfunctions arise due to:

Power surges in the network. If the instrument has built-in fuses - protection against voltage surges, then it will withstand deviations from 220 V by 10% in one direction or the other. No more. If there is no protection, the motor burns out.

Untimely lubrication. The vast majority of electric saws have automatic lubrication. Make sure you don't run out of oil. Remember that running “dry” is death for the motor. If oil does not automatically flow to the sprocket, then lubricate it yourself every 3-5 hours of operation.

Power overload. If it happens, it’s also your fault, not the manufacturer’s. If it is stated that you can cut logs up to 5 cm in diameter, then cutting a ten-centimeter trunk is clearly overkill.

Design flaws. This is already an oversight by the manufacturer. The most common disadvantage is the rigid coupling of the gearbox with the anchor. When transferring a strong load (dull belt or solid wood) it jams and gets hot. Gears wear out quickly. The way out of the situation is to sharpen it in time and avoid overload.

What you need to know before repairing

"Golden rule self-repair- use only original parts and spare parts. If you try to install inappropriate elements of a different brand and configuration, then this is a 100% guarantee of future breakdown and failure of the electric saw.
Before you repair a tool, create the necessary base for yourself. You will need:

1. Original factory parts from the same manufacturer.
2. Pliers, wrenches
3. Electrical tester, voltmeter.
4. Soldering iron.
5. Round and oval files, mandrel and sharpening gauge.
6. A machine for sharpening a chain (this is ideal, you can sharpen it manually).

What to do if the device shows no signs of life at all? If the saw does not turn on, it is possible:
- low voltage in the network. Measure with a voltmeter. If below 180, connect the equipment through a voltage stabilizer. Sometimes, when networks are installed, it is recommended to buy a good generator with an AVR, and power all power tools from it.
- the power cable is damaged. You need to check the cord and all connections. Replace or solder the gap and insulate.
- the start button does not work. Disassemble. Repair or replace. Sometimes, if the button is faulty, the power is turned on directly, but this option is not suitable for an electric saw - safety is critically reduced.
The chain brake has activated. Check it out. It turns on at a certain position of the brake element shield. The shield should be moved back a little.
- the thermal protection relay has tripped. Possibly if you turn on an overheated device. It needs to cool down, and perhaps the relay itself needs repair.
- carbon brushes are worn out. Frequent malfunction. Happens even in almost new instruments. Usually there is a loss of power first. Replace the graphite contacts with new ones.
- damage to the motor windings. The windings are destroyed due to overheating. Need to rewind. This is quite a complex process. It is necessary to disassemble the motor, remove the burnt winding and clean the insulation from the grooves. And then do everything yourself in reverse order. And to wind the coil, they use a winding machine. In general, if you are an electrical master, then go for it. If not, take it to service.

Often, when the saw is operating, the user hears an unpleasant, cutting sound in the ear, and smells a burning smell. This is what we talked about at the very beginning of the article - lack of oil in the mechanism. Check with a dipstick: if the crankcase is full, it means the conductive channels are dirty. Fixing the problem is simple - add oil or clean the furrows.
Quite often the instrument begins to “glitch” when stopped. It does not stop immediately, but after a while. The longer the saw is in use, the longer this time period becomes. To fix the problem, you need to replace the brake band. It's just worn out and stretched out.
Sometimes, while sawing, the device suddenly begins to vibrate strongly and lose power. You already know the reason - the brushes are worn out. If you do not replace it, the saw will soon stop turning on.
The chain does not rotate. Here possible malfunctions some:
- the teeth of the plastic gear are “licked off”. It is part of the gearbox and is the first to take the blow in case of critical overloads. And that's great! It is better to replace the gear than to throw away a burnt out motor or, worse, get injured. When replacing a worn one with a new one, lubricate the gear well with oil.
- wear of other parts (drive sprocket, cam, spring, clutch cup, bearing). Having identified a worn or crumbled part, replace it with an original spare part.
- chain tension is incorrectly adjusted. The situation occurs with both key and keyless tension. The instruction manual always describes how to properly tighten the chain and check its tension.

It's hard to believe, but almost half of the breakdowns occur due to a dull chain. It entails an increase in load on the engine, its overheating and premature wear. When the sawing band is dull, the gears of the gearbox, drive sprocket, bearings, etc. break.
The first sign of dullness is dark and fine sawdust. The teeth cannot remove the desired layer, so the chips are crushed. If you examine such a saw, you can see defects on the edge and even torn pieces.
Masters advise sharpening your saw as often as possible. If you delay this process, you will need to take the device to a workshop. Sharpening a file at home is possible using a special machine or manually.
If you sharpen regularly, you can do it yourself, following the rules:

Sharpening should not be done directly on the ground, as dirt can clog the oil grooves.
Use sharpening devices: files (circle and oval), mandrel and gauge.
The sharpening angle should be greater than 30 degrees.
The file should protrude slightly above the tooth.
Sharpen the teeth one at a time, turning the tape.
Having sharpened the teeth, using a gauge, you should straighten the cuts (protrusions that are responsible for deepening during the sawing process).
If the cuts protrude slightly beyond the line of the teeth, then they can simply be filed off with a file.

As you can see, troubleshooting is easy, but also difficult. Remember that when correct operation and maintenance, the need for repairs will arise much less frequently.

The most popular electric saws

An electric chain saw is an indispensable tool for owners of private houses and cottages. It can be used to trim branches in the garden, cut down trees, cut boards and other wood-based materials. But no matter how expensive and reliable this unit is, there will come a time when minor or major faults appear in it. Of course, serious damage should only be repaired by service center. But minor repairs to an electric chain saw can most often be done by yourself.

The design of an electric chain saw differs from that of a chainsaw only in the type of drive, namely the presence of an electric motor instead gasoline engine. The unit consists of an electric motor housed in a plastic housing, a lubricant tank, an oil pump, as well as a tire and chain with cutting elements (teeth). How a chain saw works can be seen in the figure below.

Electric saws can be either with a transverse engine (shown in the figure above) or with a longitudinal engine (see photo below).

In a power saw with a transverse motor, the rotational motion from it to the drive sprocket is transmitted directly. In a device with a longitudinally located electric motor, this process is carried out through a gearbox.

The sprocket, installed in the same plane as the unit tire, rotates and pulls the chain. The latter, installed on the unit tire, slides along it at high speed. Thanks to the presence of cutting elements on the chain, wood is sawed. Since the blade of an electric saw is wider than the bar, the tool does not jam in the material, and the sawing process occurs quickly.

To reduce wear on the saw chain and bar, electric saws are equipped with lubrication system, supplying oil to the saw set.

The lubrication system includes an oil tank with a volume of about 500 ml and an oil pump. The latter continuously supplies lubricant to the bar during operation of the electric saw. Next, the lubricant is carried by the chain over the entire surface of the tire and gets onto both the drive and guide sprockets.

Basic malfunctions of electric saws

Electric chain saw breakdowns do not occur out of nowhere. Most often they can appear due to power surges in the network, improper use unit, poor build quality of the device. The main malfunctions of electric chain saws include the following.

When you press the unit start button the saw won't start. The network cable may be faulty or electrical plug apparatus. If everything is in order with the cable, then the cause of the unit failure may be a faulty start button, burnout of the motor windings, or complete wear of the brushes.
During work The brushes on the electric saw are burning, and a circular fire appears on the engine manifold. The malfunction may be caused by worn brushes or a short circuit in the armature winding.
The chain is not receiving lubrication. This happens if the oil in the tank runs out, the tube or hole responsible for supplying lubricant is clogged, or the oil pump fails.
The unit cannot develop full power . Possible reasons the following: brushes are worn out; interturn short circuit or break in the armature winding; low voltage in the network; the start button is faulty; jamming occurred in the gearbox; brake system malfunction.
The saw motor stops during operation. This behavior of the unit may be caused by gearbox jamming or brush wear.
The electric motor of the device overheats quickly. There may be several reasons why the saw heats up: high temperature environment; poor engine ventilation when operating at low speeds; ventilation holes are blocked or clogged; long work unit under heavy load; increased rate of operation of the device without rest breaks; gearbox malfunction; lack of lubrication; damage to the motor windings.
The unit makes an uneven cut. This may be due to dull chain cutters or uneven tire wear.
When the motor is running, the chain remains motionless. Most often, breakdown occurs due to clutch failure. Also, this malfunction can occur if the gears of the gearbox and drive sprocket break.

Disassembling the electric saw to repair damage

To begin troubleshooting yourself, it is recommended that you first learn how to disassemble a power saw. Complete disassembly of the unit using the example of a Makita electric saw occurs as follows.

Unscrew the screw that secures the tire and loosen the fastening slightly. Next, use the chain tension regulator to loosen the saw chain.
Completely unscrew the tire mounting screw and remove the cover.
Remove the chain from the sprocket and disconnect the bar from the unit (along with the chain).
Now you need to unscrew the 2 screws that secure the engine on the sprocket side.
You should also unscrew a couple of screws on the other side of the unit. For convenience, you can remove the oil tank cap.
Once all the fasteners have been removed, you can disconnect the gearbox from the engine.
The next step requires remove the drive sprocket. Since it is secured with a lock washer, it must be removed using a flathead screwdriver.
After removing the retaining ring, remove the washer located under it and remove the sprocket from the gearbox shaft. Then tighten the 6 screws that secure the gear stops and the handle of the device.
After tightening the fasteners, disconnect the stops and the handle from the gearbox.
Next, you should turn the gearbox over and remove the cover.
After removing the tube from the pump, remove the oil reservoir.
Press the brake lever in the direction of braking until you hear a click and release it.
Turn the gearbox over and disconnect the aluminum housing along with the shaft.
Under the plastic cover, as well as on the gears, you can see an accumulation of dust, sawdust and grease.
All gearbox parts needed clean from dirt.
Next, you should remove the oil pump plunger.
Remove the oil pump from the plastic gearbox cover.
Rotate both parts of the pump in different directions, try to gently pull them one from the other. Once the pump is disconnected, the ball and spring will fall out.
Next, you need to disassemble the brake mechanism. Put the lever on and turn it until it clicks. The spring tension in this position of the lever will be minimal.
Pry the spring with a screwdriver and remove it from the aluminum housing.
Remove the rods together with the spring.
To remove the brake band, unscrew the screw that holds it.
Before assembly on the drive gear lubricant required. This can be done as shown in the following photo. When the unit operates, the lubricant will spread through the gear teeth due to centrifugal force.
The next step requires disassemble the engine housing. Remove the gear mounted on the motor shaft.
Remove the electric brushes and unscrew 6 screws on one side of the housing and 1 screw on the other.
Remove the cover.
Remove the motor rotor using slight force.

On this complete disassembly the unit can be completed. The electric saw is assembled in the reverse order.

Diagnostic and repair algorithm

When starting to repair an electric chain saw, it is necessary to carry out sequential diagnostics of all components of the unit to determine the cause of the breakdown. Repair of the unit is carried out based on the signs of malfunctions that were listed above. Below is electric saw diagram, which shows in detail internal structure unit.

The power saw does not turn on

If, when you press the start button, the unit does not turn on, then diagnostics are carried out in the following order.

Check socket voltage. It may not exist due to a general shutdown or a malfunction of the outlet. Try turning on the unit in a different location.
If there is voltage in the outlet, then it is worth checking network cable. Remove the engine housing cover and test each wire with a tester, touching one probe to the contact inside the unit, and the other to one of the rods of the electrical plug.
If the wire is fine, then continue checking further. Check the wires going to the start button with a tester to see if there is a break.
Next, you should call button contacts at the input and at its output when the key is pressed.
After that check conductors, going to the engine of the unit. If there is a soft start module in their way, then check the circuit at the input and output of it.

If the previous actions did not reveal the cause of the engine failure, then the brushes should be removed and checked. There are times when the engine does not start due to complete wear of one or both brushes, as well as due to broken conductors in them. If the brushes are working properly, then most likely the motor has failed, namely the stator or rotor windings have burned out. In this case, in order to ring the coils, you need to have some skills and knowledge in this area. It is better to take the electric saw engine to a specialist who will find the fault and repair it. rewinding the coils.

Brushes and commutator burn

The appearance of strong sparking under the brushes can be caused by poor contact between the armature lamellas and the electrodes due to wear of the latter. To check this, you need to remove the parts from the brush holders.

It is believed that normal wear of brushes should be no more than 2/3 of their original length.

If the brushes are worn out, they need to be replaced. Also, brushes can spark due to clogging of the gap between the armature slats graphite dust. Since graphite is a conductor, it causes short circuits and sparks.

To remove dirt, you need to thoroughly clean the slats using alcohol, cotton wool and a toothbrush. It is also recommended to polish them with the finest sandpaper(zero).

No lubrication on chain and bar

Lack of lubrication on the tire or its complete absence can be caused by a clogged hole or tube through which oil is supplied to the tire. Often the chain is not lubricated if the supply of lubricant from the reservoir is interrupted. This can happen when filter clogging installed at the end of the hose. The latter is always inside the container. To fix the problem, you need to remove the hose from the oil tank and rinse the filter with gasoline.

Advice! Sometimes the oil cannot reach the tire if it is too thick. It is recommended to use a special lubricant for chains of electric and gasoline saws.

Oil pump failure It can also cause oil to not flow to the chain of the saw. After cleaning the filter, hose and lubricant supply hole, turn on the power saw and observe whether lubricant is supplied to the bar, provided that there is enough oil in the tank. If lubricant does not flow, it is necessary to remove and disassemble the oil pump, check the serviceability of the spring or its other parts (depending on the model of the unit) and, if necessary, replace it with a new one.

The engine gets very hot

The cause of engine overheating may be Reducer gear jamming, if it is heavily contaminated with small particles sawdust, or foreign objects have fallen on it, for example, fragments of a spring or plastic parts. Try turning the gearbox shaft by hand with the brake off. If rotation is difficult, you will need to disassemble the gearbox and fix the problem.

A break in the motor windings can also cause the motor to overheat. In this case, it will not be possible to repair the motor yourself. You will need to seek help from a specialist.

The engine may also overheat if No oil supply to the saw chain. This leads to poor sliding of the equipment on the tire, and as a result, to increased load on the electric motor. How to diagnose and eliminate this malfunction was described above.

The engine does not develop full power

First of all, you need to check the voltage in the network. It can sometimes decrease and lead to a drop in the power of the unit. Also, a drop in power is caused by gearbox jamming or brush wear. How to fix these problems was discussed above.

Calls similar symptoms And faulty start button. If, when checking this part with a tester, a malfunction is detected, it cannot be repaired. The button must be replaced with a new one. But if checking the above reasons did not produce results, then we can only suspect that the armature windings have burned out or an interturn short circuit has occurred in them.

The unit stops during operation

If the unit stops during operation, there may be a complete wear on one or both brushes. This is checked quite simply: remove the brushes from the holders and check their length.

Sometimes you come across brushes with a short conductor located inside the pressure spring. In appearance, such a brush will have a sufficient electrode length, but if you look closely at the spring, it will not be fully compressed due to the short conductor.

Also, the unit can stop during operation if there are faults in the gearbox. In this case, you will hear the hum of the engine, which will not be able to rotate. Often the unit stops due to end sprocket jamming located at the end of the tire due to its clogging. The sprocket's main job is to move the chain around the top of the bar. As in the case of a gearbox failure, you will hear the engine humming. You can check whether the sprocket is jammed if you try to manually pull the chain with the unit turned off and the brake released: if it does not move, it means that jamming has occurred in the tire.

Some tire models have a collapsible design, which allows you to replace the end sprocket on the electric saw bar when it is worn out or replace the bearings. If your unit has non-separable tire, then try cleaning the entire space near the sprocket using a thin wire and some penetrating liquid, such as kerosene or WD-40. After cleaning and lubricating this part, try turning it. If the sprocket turns with difficulty or does not turn at all, the bearing is damaged. In this case, the tire must be replaced.

The electric saw does not cut straight

If the electric saw is pulled to the side, in most cases this is due to one-sided tire wear. The chain, passing along such a bar, warps, and the headset produces an uneven cut. If you look at the tire, it will be more worn on one side than the other. The problem is solved by replacing the tire, as well as the chain and sprocket, which have also suffered uneven wear. Even if you install on the unit new tire, then previously worn parts will quickly render it unusable.

Advice! To avoid uneven wear of the tire, it is recommended to remove it at regular intervals (every 2 hours during intensive work) and turn it over to the other side.