How to charge the chain saw starter motor spring

Chainsaw starter: repair with your own hands

An indispensable tool when cutting firewood and felling trees is a chainsaw. Following the manufacturer’s recommendations and carrying out the necessary preventive measures will ensure a long “life” of the unit. But even the most reliable mechanism over time malfunctions, most of which can be eliminated with your own hands without the help of specialized centers. One of these malfunctions may lie in the chain saw starter, which can be repaired independently if a certain sequence of operations is followed.

Almost all leading chainsaw manufacturers equip their products with starters of similar working principle. It is no coincidence that specialized stores offer universal designs of starters that are equally successful for STIHL, Husqvarna, Makita chain saws, as well as for Chinese semi-official imitations of these brands. Only chainsaw starters of domestic production (Lesnik, Ural and others) have some peculiarities.

The chain saw starter motor works as follows. There is a handle installed in the housing groove, through which the cable is passed. If the handle rises sharply, the cable is pulled out and engages the drum of the ratchet mechanism, which transmits motion to the drum with splines, provided on the shaft. In doing so, the crankshaft makes several revolutions, and the working mixture in the space between the piston and the cylinder head is compressed. Accordingly, when lowering the handle contact between the ratchet and the splines is lost, and the shaft stops.

As the engine volume increases, so does the amount of fuel-air mixture required for its subsequent ignition, so the number of jerks for the starter rope for high-powered saws increases. That is why winding return springs made of steels with high elastic properties are used to speed up the reel return.

The chainsaw can be started more easily in the following ways:

  • The preliminary enrichment of the working mixture, for which there is a special flap in the carburetor design.
  • An automatic decompression valve that reduces the working pressure in the chainsaw cylinder.
  • An additional spring which eases the crankshaft unloading when the cable is moving.
  • Certain chainsaws (for example, Partner S-series, Maxcut, etc.) are equipped with a choke.) Primer. a pump that provides pre-pumping of fuel.

Arrangement of chainsaw starter

Almost all leading chainsaw manufacturers equip their products with starters of similar principle of operation. It is no coincidence that specialized stores offer universal designs of starters that are equally successful for STIHL, Husqvarna, Makita chain saws as for Chinese semi-official imitations of the said brands. Only chainsaw starters of domestic production (Lesnik, Ural and some others) have some peculiarities.

The principle of operation of the chain saw starter is as follows. The handle is installed in the housing slot and a cable is passed through it. If the crank is suddenly lifted, the rope is pulled out and engages the drum of the ratchet mechanism which transmits the movement to the drum with slots provided on the shaft. This causes the crankshaft to rotate several times and the mixture in the area between the piston and the cylinder head to be compressed. Accordingly, when the handle is lowered the contact between the ratchet and the splines is lost and the shaft stops.

As the engine displacement increases, the amount of fuel-air mixture needed for its subsequent ignition also increases, so the number of pulls for the starter rope for high-powered saws increases. This is why resilient springs made of high resilient steels are used to speed up the rate of recovery.

The chainsaw can be started easier in the following ways:

chain, starter, motor, spring
  • by preliminary enrichment of the working mixture, for which there is a special slide valve in the carburetor design.
  • An automatic decompression valve that reduces the working pressure in the chainsaw cylinder.
  • Installation of an additional spring, which in the process of moving the cable facilitates the crankshaft unscrewing.
  • Certain chainsaws (for example, Partner S-series, Maxcut, etc.) have this feature.) primer. a pump that provides pre-pumping of fuel.

Starter on a chainsaw. design and principle of operation

chain saws may have different names, but they are structurally similar. Similarity in starting mechanisms of gasoline-driven sets, by means of which the engine is started. Mechanisms for starting the engine are suitable for chain saws of different brands STIHL, Husqvarna, Dolmar, Makita and others. Structurally, the chain saw starter consists of the following elements:

Pullstart Spring & Cord Setup on Husqvarna Chainsaw

  • The drum on which the rope is wound
  • Cable through which the crankshaft of the tool is set in motion
  • A handle for ease of use of the mechanism
  • A wireframe with a spring that winds the rope around the drum (returns to its original position) when the sawyer starts the motor

The working principle of this device is simple. When the handle of the mechanism is suddenly raised, the cable is pulled. The wire engages with the ratchet, transmitting the movement to the slotted drum. This is how the crankshaft is moved and it makes several revolutions. At this moment the fuel-air mixture is compressed in the cylinder. As soon as the handle is returned to its original position, the ratchet and splines are separated and the shaft stops rotating.

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The amount of air-fuel mixture in the cylinder increases with each subsequent pull of the cable. The starter mechanism is designed with return springs to enable the cable to return to its original position. They are made of resilient steel. It is this spring that is often the cause of a unit starter malfunction that can be repaired.

Chainsaw Recoil Starter Spring (How to Rewind). The Repair Specialist

Repair procedure

The peculiarities of the starter implies a sharp and rough impact, which sooner or later will result in a breakdown. Fortunately, there is nothing much to break in this mechanism, and the following instructions cover all possible causes of failure. Starting with how to rebuild or how to insert the spring into the chain saw starter, and ending with installing the flywheel removal dogs. Step-by-step guides, step-by-step, for each problem.

Repairing the spring

The most popular case of failure is related to the chipping of the attachment ear of the main strap spring, which carries out the reeling of the cable. Finding and buying a new part is not necessary, as the procedure requires minimal time and tools. Only two things are needed: a fire source (gas stove or burner) and pliers.

Carefully remove the spring from its housing. You can pry it up with a slotted screwdriver.

In place of the broken ear, make a new one by making an ordinary ribbon bend. To prevent the metal from breaking, before bending it should be heated to a red hot and bent until it cools down (better to do it directly over the fire).

The shape and size of the bent part should be identical to the original, so it fits snugly against the protrusion of the limiter. How to tuck the spring into the chain saw starter and save your nerves, told below. Wait until it has cooled down completely before installing.

How to install the chain saw starter spring

Basic skill and standard manual dexterity, combined with a simple technology, will reduce the time required, allowing you to perform the operation quickly and almost effortlessly. Installation of the return spring begins by locking the ear on the notch, counterclockwise (when viewed from the inside of the spring housing).

Laying of the tape is done gradually, layer by layer. The thumb of the right hand holds the already placed portion of the spring, while the finger of the left hand lays down a new section. After placing about 1/3 of the circle into the body, the band is pressed down with the thumb of the left hand, the right hand is brought to it and the cycle is repeated. The entire installation process takes no more than a minute.

It is even easier to insert a new spring, bought as a spare part for the starter. It may be in a fixing winding, which is gradually removed during installation. Already twisted element is simply inserted into the housing. The easiest option is a ready-made set with a tape spring in the housing, which are put in place of the old elements in one movement.

Replacing the cord

The cases of breakage of the cable of the handle, quite common and characteristic of both Chinese models, and branded manufacturers. Because this coupling element is highly stressed and occasionally torn, the process of replacement is extremely simple. First of all, you should determine how long the cord should be on the chain saw. Depending on the size of the drum and the rope diameter, the value is between 120-140 cm (with some extra space required). Having prepared a suitable piece, you can take a Phillips screwdriver and proceed to replace.

We take the starter off the chain saw and unscrew the central screw on the ratchet.

We take out the reel and remove the old cord.

Thread the new cord through the hole from inside the groove of the drum (for convenience, the ends can be melted with a lighter).

We pull the end out of the hole for about 10 cm and tie it in a knot, so the rope will not come off.

In a special notch under the drum, we put the knot and the rest of the cord. It is desirable to leave about 1 cm to prevent it from resting against the spring housing.

We put the drum in its place, aligned with the ear of the spring, and tighten the screw with a washer (do not wind the cord).

The opposite part of the cord is put through the body of the starter and the hole in the handle, and then make a fixing knot at the end.

The cord is wound by a spring. Simply pull the cord slightly from the hole in the drum to its edge, and holding it at this point, rotate the drum clockwise. The spring strains, and when released, winds up the rope by itself. Repeat the procedure until the knob is pressed firmly against the body.

Ratchet replacement

The main element that transmits the rotation to the handwheel is subject to serious wear at the contact points. The plastic ratchet teeth resting on the pawls (especially the iron ones) tend to chip off or wear down, making starting the engine very difficult. The second problem is with the easy-start ratchet, which connects to the drum through a spring that can break at the attachment point. The ribbon spring can be restored by following the above instructions, and if the screw spring is chipped, the construction will have to be replaced. How to remove and install the chain saw starter ratchet is shown below:

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How to Repair a Starter on a Chainsaw

A chainsaw is a powerful tool, which not only needs to be operated correctly, but also taken care of. This is the only way for any tool to serve faithfully. Often sawyers are faced with the situation of failure of the starter motor, so there are difficulties with starting the motor. To start the motor, it will be necessary to perform a chain saw starter repair. And it is possible to carry out repairs with your own hands, taking only time to read the instructions.

Although chainsaws have different names, they are structurally similar. The starting mechanisms of gasoline-powered machines, by means of which the engine is started, also have a similarity. Mechanisms for starting the engine are suitable for chainsaws of different brands STIHL, Husqvarna, Dolmar, Makita and others. Structurally, the starter for a chainsaw consists of the following elements:

  • The drum on which the cable is wound
  • The cable by which the crankshaft of the tool is set in motion
  • Handle for easy use of the mechanism
  • A wireframe with a spring that winds the cable around the reel (returns to its original position) when the sawyer starts the motor

The principle is simple. When the handle of the mechanism is lifted sharply, the cable is pulled out. The cable engages the ratchet and transmits the movement to the slotted drum. It moves the crankshaft through several revolutions. At this point the mixture is compressed in the cylinder. As soon as the crank is reset, the ratchet and splines are separated and the shaft no longer rotates.

The amount of air-fuel mixture in the cylinder increases with each pull of the cable. In order to reset the rope to its original position, the starter mechanism is equipped with return springs. Made of resilient steel. It is this spring that is often the cause of the unit starter malfunction, which can be repaired.

The most common faults

The most common faults are as follows:

  • Failure of the ignition system;
  • Sudden stoppage of the saw;
  • Reduced power;
  • Wear and tear of chainsaw systems and mechanisms;
  • Fuel system malfunctions;
  • Defective starter.

To prevent malfunctions you should always check the condition of your chainsaw before you start any new jobs. Check the fuel level, oil level, chain lubrication. It is easier to prevent malfunctions with a thorough service check than to repair them later.

Each system malfunction can be corrected by different methods. Some malfunctions can be repaired with your own hands. For example, if there is a problem with the fuel system, the first thing to check is the filter. Then check to see if the carburetor is set correctly. All clearances must be adjusted in full compliance with the instructions provided with the saw. You should also check the condition of the spark plugs. If there is visible damage, a large layer of carbon deposits, misalignment, or other changes, the damaged and defective parts must be replaced.

Repair

If there is a problem in the starter, the chainsaw will not be able to start after pulling the cord. The tool will not start. The main causes of saw failure can be:

These tools and parts are required to check and repair:

  • The necessary screwdrivers, or a handle with interchangeable nozzles that are suitable for this work;
  • Replacement items to replace faulty items if necessary (for example. a replacement cord).

To inspect and repair the starter, you must first remove it from its housing. To do this, unscrew the screws that hold the side cover with the starter with a screwdriver or other special tool. Next, you need to remove the cover and inspect the mechanism. The screw that attaches the mechanism to the chainsaw cover should be unscrewed, and then remove the clamp and the starter spring. This will open up access to the pulley with the wound cord. If the cord is damaged, it must be replaced with a new one. If the breakage was a break in the cord, these actions will bring the saw back to working order. All other parts of the mechanism should be carefully inspected for damage.

Sometimes other damage can be noticed upon inspection, as follows:

  • Pulley damage. This includes splits, tears and other breakages that prevent the tool from working properly;
  • The chainsaw’s starting spring is broken. This includes spring malfunctions, defects in the attachment point. The place where the spring is inserted into the mount is considered the most problematic part of the mount.

If inspection reveals faults or weaknesses, the damaged parts must be replaced. You need to make sure that the parts match the model of the saw, otherwise you can get an even bigger problem.

Having completed the repair and replacement of parts with their own hands, you need to assemble the mechanism correctly, in reverse order. The pulley should be installed over the starter spring and be firmly connected to it. The pulley is wrapped with a cord through a hole in the cover so that when it starts and rotates, it tightens the cord into the mechanism. To get the desired tension in the cord, you should make 4 turns. this is enough. To get acquainted with the technology of the starter repair you can watch video.

To fix the problems with your own hands may need additional action. For example, if the cord openings in the pulley and housing cover can not be matched at first attempt, a few more turns are necessary.

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After the mechanism is repaired and reinstalled, you can start. All repairs need not be done at home. If you do not have enough experience and free time, you can contact the service center. Timely preventive maintenance will avoid sudden breakdowns. If you use your chainsaw responsibly, check its technical condition, monitor the quality of fuel you can extend the life of your tool.

Every chain saw needs a starter motor to start it quickly. Rapid cranking of the tool’s crankshaft compresses the fuel-air mixture fed to the engine and ignites it. That’s why a chain saw starter motor plays a key role in the chain saw’s functionality.

Design of chain saw starter

Almost all major chainsaw manufacturers build their products with starters that work on a similar principle. It is not by chance that in specialized stores there are universal designs of starters, which are equally suitable for STIHL chain saws, Husqvarna, Makita, and for the Chinese semi-official imitations of these brands. Some features have only starters of chainsaws manufactured domestically (Lesnik, Ural and several others).

The chain saw starter motor works like this. The groove in the body carries a knob through which a wire is passed. If the handle is suddenly lifted, the cable is pulled out and engages the drum of the ratchet mechanism, which transmits the motion to the drum with splines provided on the shaft. This causes the crankshaft to go through several revolutions and the mixture in the space between the piston and the cylinder head is compressed. Accordingly, when lowering the handle the contact between the ratchet and the splines is lost and the shaft stops.

as the engine displacement increases so does the amount of fuel-air mixture needed for its subsequent ignition, so the number of jerks for the starter rope for large power saws increases. Therefore, in order to speed up the return of the drum, the forced return springs, made of steels with high elastic properties, are used.

Facilitating the start of the chainsaw is realized in the following ways:

  • Pre-enrichment of the working mixture, for which there is a special slide valve in the carburetor design.
  • An automatic decompression valve that reduces the working pressure in the chainsaw cylinder.
  • Installation of an additional spring, which facilitates the crankshaft unscrewing in the process of cable movement.
  • Some chainsaws (e.g. Partner S-series, Maxcut, etc.) are designed to.) primer. a pump for pre-pumping the fuel.

Block: 2/3 | characters: 1964

To disassemble the chainsaw for repair or replacement of the starter motor

Now is the time to find the problem

  • Look carefully at the pulley. The most common cause of pulley malfunction is mechanical damage (cracks or tears), which prevents it from responding properly to the movement of the starter cord.
  • Check the spring integrity of the starter motor. Often breaks the top edge of the spring, which when disassembled faces you. Often fails the stop on the housing cover, which fastens the spring.
  • If you found faulty parts. they should be replaced with serviceable ones, and then assemble the chainsaw in the reverse order.
chain, starter, motor, spring

The order of the repair

First unscrew the screws fixing the starter cover (usually 3 or 4). When you buy a chain saw it comes with a spark plug wrench and a simple screwdriver. If you don’t have a brand-name box at hand, you can also use ordinary tools. Next, from the body of the chainsaw remove the starter. As a rule, there are no problems with it even if the tool is quite dusty and clogged.

Then it is necessary to unscrew the screw fixing the soft starter mechanism and the coil. At the same time it is necessary not to lose the washer, which is necessary for the operation of the structure. Immediately afterwards remove the soft starter mechanism and the winding spool, which may show signs of damage (such as chipped fasteners).

chain, starter, motor, spring

Prepare a new cord, 120 or 130 cm long. If you did not manage to buy the original rope, the kapron wire will do, and you should melt the ends by burning it with a match.

Tie a knot on one end, which should not protrude when secured to the spool, and thread the cord. Then insert the spool in place so that the hook of the spiral spring hits the slot. Turn it clockwise and check the correctness of installation.

Mount the soft-start mechanism on the housing and fix it with the screw and washer. Then tuck the other end of the cord into the outlet.

Thread the cord through the trigger handle and tie a knot at its end. Let it out into the chain saw starter and twist it without winding the cord. Then fix the coil by hand and pull the loop outward by the handle. Hold the cord and the mechanism with your hand and wind the rope on the spool.

Check the starter mechanism after replacing the cable and fasten the assembly to the chainsaw body with the fastening screws.

If repair using a clothesline is not an option, the managers of the store “KPD Tool” will pick up branded starter cord from the extensive range of spare parts for chain saws.

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