How to change the rope on a chainsaw starter

Chainsaw starter. design and principle of operation

Chainsaws, although they have different names, are structurally similar. The trigger mechanisms of gasoline units, with the help of which the engine is started, also have a similarity. The mechanisms for starting the internal combustion engine are suitable for chainsaws of various brands STIHL, Husqvarna, Dolmar, Makita and others. Structurally, a starter for a chainsaw consists of the following elements:

  • The drum on which the cable is wound
  • The cable with which the crankshaft of the tool is driven
  • Handle for ease of use of the mechanism
  • Spring frame that winds the cable around the drum (returns to its original position) when the sawman starts the motor

The principle of operation of such a device is simple. With a sharp lift of the handle of the mechanism, the cable is pulled out. The cable engages with the ratchet, transferring motion to the spline drum. This is how the crankshaft moves, which makes several revolutions. At this moment, the working mixture is compressed in the cylinder. As soon as the handle returns to its original position, the splined ratchet connection is disconnected and the shaft stops rotating.

With each subsequent jerk of the cable, the amount of fuel-air mixture in the cylinder increases. In order for the cable to return to its original position, return springs are used in the design of the trigger mechanism. They are made from resilient steels. It is this spring that often causes a malfunction of the starter of the unit, which can be repaired.

How to repair a starter on a chainsaw

The chainsaw is a powerful tool that you need to not only work with correctly, but also take care of it. This is the only way any instrument can serve faithfully. Often sawers are faced with a situation of failure of the starter, so there are difficulties with starting the motor. To start the engine, you will need to repair the chainsaw starter. over, you can carry out repairs with your own hands, taking only time to read the instructions.

Starter breakdowns and how to fix them

If you have to often start the chainsaw engine, then this entails an accelerated development of the starting device. It is impossible to predict which part of the starting device will fail first, but most often the cable breaks or the spring breaks. It is not difficult to determine the malfunction of the cable break, but in any case, if a breakdown occurs, you will need to revise and repair the chainsaw starters.

Common breakdowns of the starting mechanism of the units and their elimination:

  • Break of the cord and its replacement. As soon as the motor starts, the cable contacts the mechanism body in the form of friction, thereby rubbing it. If the cable has obvious signs of wear, then it is better not to wait for the handle to come off altogether, and you can start the chainsaw only after repairs. The starter rope must be replaced, for which the body is disassembled and the ratchet is lifted. Raise it carefully to prevent the return spring from jumping off. The old rope is disconnected and a new starter rope is installed in its place. After replacement, replace the cover
  • Chainsaw starter spring replacement. Now let’s look at how to replace the spring of the starting device of the gasoline unit. this is a device that returns the drum along with the cable to its original position. If the spring is damaged at the point of connection to the drum (where a loop is formed), then it is not at all necessary to change it to a new one. To do this, you can make a new loop, having previously cleaned the damaged area. After that, the spring is heated to a temperature of 600-650 degrees (when it becomes crimson), and gradually cools down. At a temperature of 150 degrees, a bend should be made, and the part should be completely cooled. Now you can put it back in place and continue to operate. If there are difficulties with heating or the spring bursts in a different place, then it should be replaced.
  • Do-it-yourself repair and replacement of flywheel dogs is not particularly difficult. Work begins with dismantling the flywheel and removing the pawls. In place of the seized dogs, new ones of the same materials should be installed. If instead of plastic, you decide to put metal, then they may last longer, but the flywheel will wear out faster. How to replace the flywheel dogs of a chainsaw is described in detail in the video.

How to replace the starter spring on a chainsaw

If the starter spring for a chainsaw has broken, which is often found on units of Chinese origin, then you need to replace it. It is not necessary to completely change the entire starter.

Here are the detailed instructions for replacing the trigger spring:

  • Initially, the clip (drum) of the mechanism is removed
  • There is a spring in the design of the drum, which must be removed. Secure the top and pull the handle
  • A new one should be installed in place of the old spring. Before installing the part, you need to clean the drum housing
  • The new spring is initially placed in the drum, and then it is required to get the antennae into the groove
  • The drum is installed in place, and the starter cover is mounted on the tool

A detailed and visual description of replacing the spring of the starting device is shown in the video.

To repair a starter on a chainsaw, you need to find out the reason, and, depending on the breakdown, eliminate it. If the mechanism cover itself bursts, then it is easier to replace the device completely. To extend the lifespan of the trigger, tool maintenance must be carried out.

How to put a spring on a chainsaw starter?

Fitting the spring into the correct groove is a tricky task. First of all, the part will need to be twisted, returning it to its previous dimensions. After that, it must be inserted into the cavity of the standard drum hub. To fill the spring in the chainsaw starter, you need to proceed in this order:

  • The outer end of the spring used must be fixed in a special stop lug. In this case, the second end with a screwdriver will need to be installed opposite the standard hole inside the lock;
  • Next, the loop located at the inner end of the standard spring should be aligned with the hole. It is better to use a screwdriver for this. When the ends are aligned, the disc will need to be lowered;
  • After mounting the disc, you need to check that the dog of the factory ratchet mechanism of the chainsaw is in its regular place. Then you can assemble the ratchet in reverse order.
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To wind the spring on the chainsaw starter, you need to take into account all the holes and notches available. After installation, you will need to tighten the spring. As soon as the slack is eliminated, the spring will remain to be wound a few turns. this is necessary to maintain the required tension of the installed part.

Chainsaw starter device

The principle of operation of a starter for a chainsaw is as follows. A handle is installed in the groove of the body, through which a cable is passed. If the handle is lifted sharply, the cable is pulled out and engages the drum of the ratchet mechanism, which transfers the movement to the drum with splines provided on the shaft. In this case, the crankshaft makes several revolutions, and the working mixture in the space between the piston and the cylinder head is compressed. Accordingly, when the handle is lowered, the contact between the ratchet and the splines is lost, and the shaft stops.

With an increase in engine volume, the required amount of the fuel-air mixture required for its subsequent ignition also increases, so the number of jerks for the starting cable for high-power saws increases. Therefore, in order to accelerate the return of the drum, unwanted return springs are used, made of steels with high elastic properties.

Facilitation of starting the chainsaw is implemented in the following ways:

  • By preliminary enrichment of the working mixture, for which there is a special damper in the carburetor design.
  • Installation of an automatic decompression valve, which reduces the working pressure in the cylinder of the chainsaw.
  • Installing an additional spring, which, during the movement of the cable, facilitates the unwinding of the crankshaft.
  • The presence in the design of some chainsaws (for example, Partner S series, Maxcut, etc.) a primer. a pump that provides preliminary fuel pumping.

Chainsaw starter repair

With frequent starts of the chainsaw, some parts of the starter are constantly subjected to dynamic loads. As a result, the cable may burst, several ratchet teeth may crumble, and the shaft will turn at a much lower speed. Therefore, the revision and even repair of the starter are operations that are sometimes carried out several times per season.

Replacing the cord

In order to replace the cord, you will need the following tools:

Replacing the starting cord is performed as follows:

change, rope, chainsaw, starter
  • It is necessary to unscrew the fastening screws that hold the side cover with a screwdriver.
  • Then remove the starter from the tool body.
  • After that, you need to turn the lid and inspect.
  • Then dismantle the clamp and spring.
  • Untie the knot on the rope.
  • It is necessary to pull out the pulley on which the cord is wound. Remove the cord and replace it with a new one.
  • Then put the pulley in place and tie the rope to a knot. Install clamp and spring.
  • Then tighten the cover with the fixing screws.
  • Finally, put the starter back in place and tighten the fastening screws.

Chainsaw starter device

As standard, the chainsaw starter consists of a number of parts.

  • coil;
  • cable;
  • the frame to which the return spring is attached;
  • a pen.

A protective cover is installed on top of all elements of the starter. The original principle of operation of most triggers is also almost the same. In a special groove in the chainsaw body there is a handle that holds the cable. When the handle is raised sharply, the latter is understood. At this moment, a ratchet is triggered, which, through the drum, transfers the force to another drum with splines located on the engine shaft.

When pulling out the standard cable, the chainsaw motor shaft begins to rotate, which leads to compression of the existing fuel mixture located at this time between the cylinder head and the standard piston.

With an increase in the volume of the internal combustion engine cylinder, the amount of consumed fuel mixture, which is required for its future ignition, also increases. Consequently, the operator of a powerful saw needs more jerking strokes than the owner of a low power tool. Powerful chainsaw manufacturers use resilient return springs to increase the speed at which the drum returns to its original position.

How to repair a chainsaw starter with your own hands

If difficulties arise during starting the tool, power has disappeared or there are malfunctions in the fuel supply system, then it is necessary to repair the chainsaw starter with your own hands or return the tool to service.

Chainsaw starter repair

In the course of frequent use, some components of the chainsaw may be subject to constant dynamic influences, due to which, for example, at the most inopportune moment, the cable may burst, the shaft will begin to turn at a much lower speed, or the ratchet teeth will crumble. Given this, the repair and revision of the chainsaw starter can be operations carried out even more than once during one working season.!

change, rope, chainsaw, starter

Carburetor assembly

The carburetor is required for the continuous operation of the internal combustion engine. It consists of the following structural elements:

  • one-piece aluminum body;
  • nozzles, which are valves that regulate the amount of fuel;
  • diffuser;
  • float chamber;
  • atomizer.

A damper is installed in the carburetor body, which regulates the supply of atmospheric air, an impulse channel, a diffuser, an inlet fitting, two screws (idle and main). Very often, chainsaw manufacturers equip their products with a carburetor from popular brands.

Most models of chainsaws are equipped with identical (in their design) carburetors. Their device is shown schematically in the photo below. Only rare cheap Chinese-made modifications may differ in the absence of a number of parts in the carburetor assembly.

In order to correctly adjust the carburetor of a gasoline saw, you should understand the principle of its operation, which is as follows:

  • when the engine is started, the air damper, located on the housing in the lower part of it, opens;
  • due to the movement of the piston (stroke), a vacuum is created inside the float chamber, as well as in the air channel;
  • this causes the air mass to be sucked through the diffuser;
  • from the gasoline tank, the fuel mixture penetrates into the float chamber, passing through the fitting;
  • then gasoline in the diffuser is mixed with atmospheric air, and a fuel-air mixture is obtained;
  • then it enters the inlet channels;
  • from there the mixture enters the combustion chamber.

Using the damper, you can enrich or deplete the fuel with air, that is, adjust the rate of its flow in accordance with the operating conditions. Using the screws, the engine speed is adjusted. The flow rate of gasoline into the diffuser from the chamber is adjusted by a jet. The incoming air is cleaned by a filter mounted above the carburetor.

Self-replacement of the starting cord and the chainsaw starter spring (grass trimmer)

Chainsaw starter. Learning to self-repair

Any chainsaw requires a starter to quickly start. With accelerated scrolling of the crankshaft of the tool, the fuel-air mixture supplied to the engine is compressed, not its subsequent ignition. How to replace the spring details of replacing the chainsaw starter dogs how to tighten. Therefore, the normal operation of the starter for the chainsaw determines the performance of the entire mechanism.

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Only domestically produced chainsaw starters have some features (Lesnik, Ural, not a number of others).

The principle of operation of a starter for a chainsaw is as follows. A handle is installed in the groove of the body, through which a cable is passed. The principle of operation of a starter for a chainsaw is how to put a spring on the starter.

Accordingly, when the handle is lowered, the contact between the ratchet is not lost, the shaft does not stop.

With an increase in engine volume, the unnecessary amount of fuel-air mixture necessary for its subsequent ignition increases, therefore the number of jerks for the starting cable for high-power saws increases. Therefore, with the intention of accelerating the return of the drum, unwanted return springs are used, made of steels with high elastic properties.

Facilitation of starting the chainsaw is implemented in the following ways:

  • By preliminary enrichment of the working mixture, for what purpose there is a special damper in the carburetor design.
  • Installation of an automatic decompression valve, which reduces the working pressure in the cylinder of the chainsaw.
  • Installation of an additional spring, which during the movement of the cable facilitates the unwinding of the crankshaft.
  • The presence in the design of some chainsaws (nettle, Partner S series, Maxcut, etc.) a primer. a pump that provides preliminary fuel pumping.

Do-it-yourself high-quality chainsaw starter repair

  • Common malfunctions
  • Starter repair work
  • Practical advice

The chainsaw is the main tool with which you can stock up on firewood for a bath or fireplace, you can also use it when building work in a summer cottage or in a private house.

Subject to all operating criteria and preventive measures provided by the manufacturer, the chainsaw can last for a long time. Chainsaw repair partner 350 how to insert the spring into the starter.

But over time, small malfunctions may appear that can be dealt with without the help of others. How to wind a starter spring repairing a chainsaw starter (broken spring) 2 y. Back.

Chainsaw starter device: 1. starter screw, 2. bushing, 3. light start spring, 4. screw, 5, 6. starter coil, 7. deflector, 8. starter cover, 9. handle and cord, 10. screw.

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this is how I wind the springs of the starter of the gas meters, but the springs of the starters of the saws and motoblocks are wound along.

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DIY chainsaw repair. replacing the manual starter spring.

Any chainsaw requires a starter to quickly start. With accelerated scrolling of the crankshaft of the tool, the fuel-air mixture supplied to the engine is compressed and subsequently ignited. Therefore, the normal operation of the starter for the chainsaw determines the performance of the entire mechanism.

If the starter spring for a chainsaw has broken, which is often found on units of Chinese origin, then you need to replace it. It is not necessary to completely change the entire starter.

Here are the detailed instructions for replacing the trigger spring:

  • Initially, the clip (drum) of the mechanism is removed
  • There is a spring in the design of the drum, which must be removed. Secure the top and pull the handle
  • A new one should be installed in place of the old spring. Before installing the part, you need to clean the drum housing
  • The new spring is initially placed in the drum, and then it is required to get the antennae into the groove
  • The drum is installed in place, and the starter cover is mounted on the tool

A detailed and visual description of replacing the spring of the starting device is shown in the video.

change, rope, chainsaw, starter

To repair a starter on a chainsaw, you need to find out the reason, and, depending on the breakdown, eliminate it. If the mechanism cover itself bursts, then it is easier to replace the device completely. To extend the lifespan of the trigger, tool maintenance must be carried out.

Ignition system

Initially, the ignition system for chainsaws was of a contact type. Now it is practically not used. Modern manufacturers equip their equipment with electronic ignition (in the photo below, disassembled). For this reason, there is no need to regularly clean the contacts and set the required distance between them.

The ignition system, due to which a spark is generated during engine start-up, consists of the following parts:

  • magneto;
  • candles;
  • electronic unit;
  • electrical wiring;
  • motor on / off buttons.

The appearance of the elements of the ignition system of one of the models of chainsaws from the brand “STIHL” is shown in the following photo.

Magneto is an alternating current generator that supplies voltage to a candle. It can be of two types:

  • contact;
  • contactless.

Ignition systems with contactless and contact types of magneto are schematically presented below.

Magneto of any type includes the following parts:

  • flywheel;
  • permanent magnet;
  • coil consisting of windings with a core.

The electronic unit usually includes diodes, resistances of various sizes, thyristors, capacitors. The connection diagram depends on the saw model.

Ignition works according to the following principle:

  • when the flywheel with a permanent magnet attached to it rotates, an electromotive force is induced in the system;
  • the current generated in the circuit is converted by the electronic unit into electrical signals;
  • they are transferred to the candle;
  • a spark is formed between its contacts, which causes the ignition of the fuel-air mixture.

The ignition is initially adjusted so that sparking occurs when the engine piston does not reach its top dead center by about 3-4 mm. If you are guided by the circumference of the crankshaft movement, then this corresponds to an angle of 28 degrees.

  • central and side electrodes;
  • hulls;
  • isolator.

Thus, due to the presence of ignition, the fuel mixture ignites, which ensures the transition of the engine to an operating state. Periodically, the system needs adjustment, which is easy to carry out on your own.

Chainsaw starter. design and principle of operation

Chainsaws, although they have different names, are structurally similar. The trigger mechanisms of gasoline units, with the help of which the engine is started, also have a similarity. The mechanisms for starting the internal combustion engine are suitable for chainsaws of various brands STIHL, Husqvarna, Dolmar, Makita and others. Structurally, a starter for a chainsaw consists of the following elements:

  • The drum on which the cable is wound
  • The cable with which the crankshaft of the tool is driven
  • Handle for ease of use of the mechanism
  • Spring frame that winds the cable around the drum (returns to its original position) when the sawman starts the motor
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The principle of operation of such a device is simple. With a sharp lift of the handle of the mechanism, the cable is pulled out. The cable engages with the ratchet, transferring motion to the spline drum. This is how the crankshaft moves, which makes several revolutions. At this moment, the working mixture is compressed in the cylinder. As soon as the handle returns to its original position, the splined ratchet connection is disconnected and the shaft stops rotating.

With each subsequent jerk of the cable, the amount of fuel-air mixture in the cylinder increases. In order for the cable to return to its original position, return springs are used in the design of the trigger mechanism. They are made from resilient steels. It is this spring that often causes a malfunction of the starter of the unit, which can be repaired.

Most often, damage to the soft-start spring occurs from the end where it is visible when disassembling the housing.

  • The pulley could be damaged. There may be cracks or tears or damage to the back. As a result of these problems, the tool cannot perform work.
  • Damaged soft start spring. In this case, both the spring itself may be mechanically defective, and there may be defects in the place of its attachment. The weakest point of this element is precisely the fastening point and the tip of the spring, which is inserted into it.

If defective or partially damaged starter parts are found, they must be replaced with new ones. In this case, the new elements must correspond to the repaired saw model.

The pulley is installed over the spring. In this case, it is necessary to check how much they adhered to each other. Continuing the repair, it is necessary to wind the pulley. This must be done in such a way that, as it rotates, it pulls the cord into the starter. It is enough to make 3-4 turns to give the required tension. First, the rope is passed through the hole in the cover of the chainsaw.

Chainsaw starter repair. With your own hands.

How to make a starter on a chainsaw yourself? How to bend the spring on the chainsaw starter? How to wind a spring

Fuel system

The fuel system design is shown in the diagram below.

  • fuel filter;
  • carburetor;
  • fuel pump (primer) manual type.

Gasoline is in the tank, from which it flows through a hose to the carburetor unit. The simplest options do not include a pump. The fuel filter is located at the end of the hose that is immersed in gasoline. Its appearance is shown in the following photo.

When fuel is consumed, a negative pressure forms in the tank due to its filling with atmospheric air. This leads to the fact that the flow of gasoline into the carburetor assembly stops. To avoid this phenomenon, the tank lid is equipped with a breather: if it gets dirty, the tool stalls.

Chainsaw primer makes it easy to start. The carburetor compartment is filled with fuel in advance, which allows you to quickly start the engine, and also leads to a decrease in the effect of the load on it.

In order to obtain an air / fuel mixture of the proper quality, clean gas is required. The presence of impurities in the air can disrupt the functioning of the internal combustion engine of the instrument. Therefore, chainsaws are equipped with a preliminary and fine filter system to remove contaminants.

Pre-filtration is usually done with a strainer.

Filters designed for fine cleaning (photo below) are made from nylon mesh or foam rubber or from materials similar in characteristics.

Some of the saw models have a centrifugal type of intake air cleaning system. It is installed instead of the pre-filter element. The meaning of the functioning of such cleaning is that the incoming air flow is twisted by the flywheel. In this case, contaminants are thrown away from the pipe leading to the filter.

Contamination of the filter elements leads to a decrease in the volume of atmospheric air entering the carburetor assembly. This causes the saw to drop in motor power. For this reason, filters that purify the air from impurities should be cleaned regularly by flushing or simple blowing. The suitable method is determined by the material from which they are made.

Typical malfunctions

Subject to the rules of operation and careful use of the chainsaw can serve the owner for many years. However, minor malfunctions and malfunctions still occur. Among the most common breakdowns are problems in the ignition system and starter malfunctions.

  • broken or burst pulley;
  • breakage of the launching cable;
  • burst starter spring.

How to Replace a Starter Rope on a Stihl ChainsawThe Easy Way by Bobby

over, the owner of the tool can independently eliminate such breakdowns and install the chainsaw starter spring. Observing a certain sequence of actions.

The most common tool breakdowns include the following:

  • problems in the ignition system;
  • stopping the chainsaw in the process of cutting;
  • loss of power during operation;
  • wear of some structural elements of the chainsaw (brake band, drive sprockets, anti-vibration parts);
  • problems in the fuel supply system;
  • malfunctions associated with the starter.

In addition, it is necessary to carry out a visual inspection of the chainsaw before starting work and preventive measures. These include chain lubrication, control of the amount of fuel mixture, and the availability of the required amount of oil.

Unscrew the spark plug to check its condition.

Each of the faults is eliminated according to its own technology. So, for example, repairing the fuel system of a chainsaw should begin with an inspection of the corresponding filter. After that, they check the correctness of the carburetor regulation, which is carried out with the help of screws. Clearances must be set in strict accordance with the manufacturer’s instructions, which must be included with the chainsaw.

Each of the faults is eliminated according to its own technology. So, for example, repairing the fuel system of a chainsaw should begin with an inspection of the corresponding filter. How to repair a chainsaw starter with your own how to make a hanger in a wardrobe from pipes. After that, the correct regulation of the carburetor is checked, which is carried out with the help of screws.

Clearances must be set in strict accordance with the manufacturer’s instructions, which must be included with the chainsaw. The repair of the ignition system includes inspections of the spark plugs. If heavy carbon deposits are found, the gap changes or other visible damage is found, this element must be replaced.