How To Insert The Spring Into The Lawn Mower Starter

Chainsaw starter: device, damage and DIY repair

In the design of the chainsaw, the starter is responsible for the correct starting of the engine of the tool. Over time, owners of chainsaws are faced with the need to repair this important unit. And, the sooner it is possible to eliminate the malfunction, the less other important parts and mechanisms of the tool will succumb to wear.

How to fix a starter on a chainsaw

The cause of a malfunction of the chainsaw starting system can be:

  • Drive pulley. This part is subject to high axial and radial loads, therefore it is recommended to inspect the pulley for damage and cracks on the back of the housing before starting work. If necessary, repair the part or replace it with a new one.
  • Spring mechanism. If it has lost its properties or has cracks or breaks on it, it is necessary to replace this element. It is also recommended to inspect the attachment points for defects.
  • Rope launch system. The rope should be inspected for wear and damage. If necessary, replace the part and install it on the pulley.

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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:

  • Breakage of the cord and its replacement. As soon as the motor starts, the cable contacts the body of the mechanism 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 case 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
  • Replacing the starter springs for chainsaws. 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 another 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 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 you need to repair the chainsaw starter with your own hands or return the tool to service.

How to put the spring

In order to install a new spring, you must perform the following steps:

  • Carefully remove the mechanism clip.
  • Inspect the inside of the cage, in which the spring mechanism is located near the C-shaped element.
  • Lock and tighten the top of the spring with your finger and pull the starter handle to the side.
  • Remove the worn mechanism and wind up a new spring. Bends and twists of the element should be avoided.
  • Assemble a new spring mechanism. It is recommended to do this slowly so that the mechanism does not unwind.
  • Fill the spring and insert it into the starter mechanism.
  • Secure the clip carefully.

Device

The chainsaw starter device includes the following elements:

  • ignition system screw;
  • return spring;
  • coil of the starting system;
  • deflector;
  • cap;
  • magneto;
  • drum;
  • spark plug;
  • the electronic unit;
  • wiring;
  • power button;
  • handle and cable.

The main parameters of the chainsaw start system:

  • power. from 2000 to 2500 W;
  • the maximum number of revolutions per minute. 3000;
  • weight. 0.5 kg.

After pressing the power button, the flywheel begins to rotate along with the magnet that is on it.

An electromotive force appears in the system. The resulting current is converted by an electronic unit into electrical signals, which are transmitted to the driving elements. A spark is formed, which provokes the ignition of the fuel-air mixture.

Typical breakdowns and repairs of the chainsaw starter

The appearance of various malfunctions of the starter leads to the inability to start the chainsaw. The most common starter breakdowns include:

  • The starter pulley is completely burst or cracked;
  • The spring has burst;
  • Starter rope broke.
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To fix each of these faults with your own hands, you will need certain tools. You must have a set of screwdrivers and a spare cable with you. It is necessary to remove and inspect the starter for the chainsaw in the following order:

  • To find the cause of the breakdown, the starter will need to be removed from the chainsaw. To do this, unscrew the screws with a screwdriver, with which the protective cover is held with the starter attached to it;
  • After removing the cover, you must carefully unscrew the screw by means of which the starter is attached to the protective cover;
  • Then you need to try to smoothly start the starter. for this, remove the spring and clamps from it;
  • Further, a coil with a cable is removed from the starter for inspection.

As a result of inspection, you can find a number of typical faults. These include:

  • Various damage to the pulley in the form of breaks or cracks, mainly in the rear of the part. they interfere with the normal operation of the entire starter;
  • Damage to the starter spring of the lightweight start. in such cases, not only the spring itself can be faulty, but also the place of its fixation. this is the most vulnerable part of the spring;
  • Damaged starter flywheel dog.

In any case, any defective part must be completely replaced with a new part.

The device and principle of operation of the chainsaw starter

Most well-known chainsaw manufacturers equip their products with starters that work on almost the same principle. Its essence is as follows: in the groove of the saw body there is a handle through which the cord is passed. When the handle is suddenly lifted, the cord is pulled out, which engages the drum, which is in the ratchet mechanism. This drives the spitz drum, which is located on the shaft. During this, the crankshaft makes a couple of revolutions, which leads to compression of the fuel mixture, which at this moment is located between the cylinder head and the piston. When the handle is lowered, on the contrary, the ratchet and the spitz loses their contact, which leads to a stop of the shaft.

With an increase in the power of the chainsaw, the amount of the fuel mixture increases, which should ignite when the chainsaw is started. In this case, increase the number of jerks of the starter cord to start the engine. To speed up the return of the drum mechanism, manufacturers use a special steel starter return spring, which has excellent elasticity. Leading brands use other methods to make it easier to start a chainsaw:

  • Pre-enrichment of the fuel mixture using a separate flap;
  • Installation of an automatic decompression valve, which reduces the pressure inside the cylinder of the chainsaw;
  • Installing a primer designed to pump fuel before starting the engine.

The use of one of these technologies greatly facilitates starting and extends the life of the starter, which is especially noticeable at low temperatures.

Replacing the cord

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

Replacing the starting cord is performed as follows:

  • 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 remove the clamp and spring.
  • Untie the knot on the rope.
  • You need 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.

Typical breakdowns and repairs of the chainsaw starter

The appearance of various malfunctions of the starter leads to the inability to start the chainsaw. The most common starter breakdowns include:

  • The starter pulley is completely broken or cracked;
  • The spring has burst;
  • Starter rope broke.

To fix each of these faults with your own hands, you will need certain tools. You must have a set of screwdrivers and a spare cable with you. You need to remove and inspect the starter for a chainsaw in the following order:

  • To find the cause of the breakdown, the starter will need to be removed from the chainsaw. To do this, unscrew the screws with a screwdriver, with which the protective cover is held with the starter attached to it;
  • After removing the cover, you must carefully unscrew the screw by means of which the starter is attached to the protective cover;
  • Then you need to try to smoothly start the starter. for this, remove the spring and clamps from it;
  • Further, a coil with a cable is removed from the starter for inspection.

As a result of inspection, you can find a number of typical faults. These include:

  • Various damage to the pulley in the form of ruptures or cracks, mainly in the rear of the part. they interfere with the normal operation of the entire starter;
  • Damage to the starter spring of the lightweight start. in such cases, not only the spring itself can be faulty, but also the place of its fixation. this is the most vulnerable part of the spring;
  • Damaged starter flywheel dog.

In any case, any defective part must be completely replaced with a new part.

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 and subsequently ignited. Therefore, the normal operation of the starter for the chainsaw determines the performance of the entire mechanism.

Chainsaw starter device

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

These include:

  • 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 of the 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.

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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.

Replacing the starter

Procedure for replacing the chainsaw starter:

  • Remove the assembly from the tool body.
  • Unscrew the fastening bolts and remove the side cover.
  • Unscrew the fastening screw with which the starter is attached.
  • Remove the clamp and spring mechanism of the starting system.
  • Dismantle the pulley with cord.
  • Replace all worn and damaged parts.
  • Wrap the pulley.
  • Install a new starter.
  • Reinstall the pulley with cord, clamp and spring.
  • Screw on the side cover and install the assembly on the chainsaw body.

Before installing a new starter, it is recommended to inspect it for defects, check the build quality and the presence of a guide sleeve.

How to assemble a starter on a chainsaw?

After replacing the faulty elements of the starter, it is the turn of its reassembly. In this case, maximum accuracy must be observed, since the slightest discrepancy can lead to damage to the trigger. The assembly of the assembly should be performed in the following sequence:

  • The standard cable will need to be tucked into the factory hole of the reel. At the same time, the cord does not need to be wound;
  • Next, you will need to insert the coil into its base place. At this stage, many beginners make a common mistake. There are 2 slots on the surface of the coil. One of them should get the regular hook of the coil spring. To do this, the coil will need to be installed in such a way that it fits snugly into its original place, and the existing hook fits exactly into the slot. The correctness of installation must be checked by turning the coil in the direction of the clock hand until resistance appears;
  • Then you need to install a device for easy starting of the chainsaw. In this case, the protrusion of the latter should be located in the recess of the installed coil;
  • After that, you need a screw and washer to fix the device;
  • Next, the other end of the cord must be tucked into a special outlet;
  • In the next step, you will need to thread the cable into the starting handle. To this end, you will need to tie a medium-sized knot at the end of the cord. If it is too small, then the cable will slip, which is why it will quickly wind up on the drum of the trigger mechanism;
  • Then you need to release the loop inside the starter. Immediately after this, you should start the rotation of the trigger in the direction of the clock hand. In this case, the cord does not need to be wound. Next, you need to fix the coil with your hand, and pull the loop out by the handle;
  • After that, you need to check the operation of the trigger;
  • If the unit is working properly, it remains to install it on the tool, and fasten with three screws.

Starter repair is not a complicated procedure if you follow the correct procedure. As a rule, replacing the starter cord will take no more than 20 minutes. The main thing is to correctly position the pulley and drum in relation to each other. Otherwise, the trigger will not work.

How to install a chainsaw starter spring

Assembling the starter lawn mowers

When servicing and repairing a starter, it is important to assemble it correctly. as if the assembly was carried out by the manufacturer. Any part that is incorrectly installed will prevent you from fully using your trimmer or lawn mower.

  • After winding the spring, turn the coil over and position it so that the second spring hook falls back into place. To control the correct installation of the spring, there are technological windows on the coil itself.
  • Install the starter pulley and make sure that one of the spring hooks fits into the groove located on the starter cover.
  • Insert the spring and washers on the sides to prevent the spring from rubbing off the plastic compartment in which it is located. If the spring is broken, but the other is not the same, an additional washer is placed in its place.
  • Insert the cup with antennae into the slots of the coil.
  • Install the coil in its place, tighten the bolt until it stops, but without fanaticism.

If you do not shield the mainspring with washers from the compartment where it moves when the starter cord is wound in and out, the reel will often jam when you try to start the trimmer or lawn mower. Loosening the coil bolt will result in its loss.

How to assemble a lawn mower trimmer starter, watch the video.

How tight the spring is cocking?

It is possible to give the spring the necessary potential force necessary for a clear and quick winding of the cord by determining the length of the cord in turns. To prevent the cord handle from drooping, add 1-2 more turns to the number of turns. So, if the cord has a length of 5 turns of the coil, then when charging the spring, turn the coil 6-7 full turns.

How to assemble a new lawn mower starter?

To assemble the starter, do the following manipulations.

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  • Pass one end of the cord through the opening at the beginning of the spool and tie it in a knot. The knot must not pass through the hole. Otherwise, you will disassemble the starter again.
  • Wind the cord onto the spool itself.
  • Install the spring into the starter housing, hook one end of it in the groove and wind it. For convenient winding, twist the body counterclockwise.
  • Place the ratchet on the spring.
  • Hook the return spring to the ratchet itself, attach it to the spool.
  • Install the main spring and housing with the assembled ratchet, connect the parts of the starter together and tighten everything with the main bolt.
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After assembling the starter, pass the free end of the cord through the hole in the housing for the reel. Re-pass the same end through the hole in the handle that the cord is pulling on. Tie a strong knot on the handle. Check the operation of the starter handbrake.

Worst case of failure

There are times when the starter is still operational, but a worn out cord can break, for example. The ratchet has not yet had time to work when the engine is started, and the remnants of the cord are immediately wound on the coil, the return spring loses its hooks, the grooves in the starter housing break. Bottom line. replacement of both springs and housings.

If a lawn mower or trimmer model has long been discontinued, it will be difficult to find exactly the same parts, and the starter is changed entirely.

How to replace or replace the starter spring?

If everything is in order with the rope on the starter, suspicion falls on the reel itself. It is driven by a ribbon spring, coiled into a roll. To change the spring, certain steps must be taken.

  • Remove the starter from the lawn mower.
  • Remove the starter coil.
  • Unscrew the main bolt holding the pulley to the housing.
  • Pull out the gripping tendrils and spring, the ribbon spring is almost fully extended or coiled into larger diameter rings.
  • Hold it in advance.
  • Check if the spring is intact (there may be rusty streaks, fractures, etc.). If the hooks at its ends are broken, it will not be possible to bend new ones. high-carbon steel breaks when you try to bend it. Loose hooks are suitable for slight bending.
  • Make sure the auxiliary (regular) spring and washers are in place. These parts protect the coil body from being punctured by the ends of the main spring. If the washers and spring are broken, and there are no new ones available, do not tighten the coil bolt tightly, but watch it. it can unscrew and get lost.
  • If the main (flat) spring is damaged, insert the same new one. Place the hook on the end of the spring in its place and bend it, inserting coil after coil into the space where it should be.

The rewinding of the spring takes a minute. Dexterity in this action is acquired quickly.

How to replace or replace the starter spring, see the following video.

Lawn mower starters: device and installation features

  • How does the starter for lawn mowers or trimmers work??
  • Worst failure scenario
  • How to replace or replace the starter spring?
  • How tight is the spring cocking??
  • Assembling the starter lawn mowers
  • How to assemble a new lawn mower starter?
  • How to change the starter cord?

The recoil starter for a lawn mower or petrol trimmer is a mechanical unit that includes a pulley fitted to a ratchet. A rope is wound on the pulley in the initial position. At the start, it is pulled outward. The pulley is spring loaded. as soon as you let go of the end of the rope, it will reel back. A flat strip rolled into a ring is used as a spring. It resembles a spring in a large mechanical watch that is wound once a day. The starter itself is located more often at the rear than closer to the front end of the mower or trimmer. To correctly perform all manipulations with the starter for lawn mowers, you need to know the features of the device and installation.

How does the starter for lawn mowers or trimmers work??

The starter is a generally uniform and universal mechanism for lawn mowers, trimmers, gasoline and diesel generator sets. Equipping a car, motorcycle or scooter with them is not a problem, if your vehicle has free space for its installation. It was not for nothing that many Soviet cars and trucks were equipped with a starter tool that remotely resembles a crowbar bent twice.

The modern “handbrake” starts exactly from the cord. it is tied to the mechanism, and it is impossible to lose it.

The starter assembly has the following parts:

  • hook ignition spring;
  • cord wound on a reel;
  • return spring;
  • ratchet drive and main spring;
  • mechanism housing protecting the ratchet;
  • locking bolt.

How to change the starter cord?

It happens that it is not the spring that is to blame for the inability to start the starter, but the cord itself. It can seize or even break. Disassembling the starter lawn mowers or trimmers are versatile in their steps.

  • Remove starter block from trimmer or lawn mowers.
  • Remove the main bolt holding the handbrake.
  • Pull out the spool and rewind the remnants of the worn out cord from it.
  • Untie the knot on the cord handle and pull the end out of it.
  • Untie the knot at the other end (at the beginning of the spool) and remove the old cord. Knots that have become tight are untied with pliers or pliers.
  • Tie a knot at one end of the new cord, pass it through the hole at the beginning of the spool (closer to its axis).
  • Wind a few turns of the new cord onto the spool. If it is long, then cut off the excess.
  • Load and charge the spring-loaded cord tensioner (if removed) and spring-loaded elements in the correct sequence.
  • Replace the spool and thread the free end of the cord through the starter outlet and handle.
  • Reinstall the starter block.

Twist the starter by the cord, start the engine on lawn mowers or trimmers. The larger and more powerful the engine, the more jerks of the cord will be required at startup, the norm is no more than 7 times. The result is a quick and smooth start of the motor, the readiness of the unit for operation.