How to assemble the starter spring for a STIHL grass trimmer
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Lawn trimmer starter repair online store of spare parts for garden equipment.
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We repair a broken chain saw starter spring. Model and brand of trimmer is not listed as starters.
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We show the process of fixing the spring and reassembling the starter of chain saws Husqvarna. Spring. coil and starter.
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How to put the spring on the chain saw starter?
With this procedure, even experienced users have difficulties.
To refuel the spring in the chainsaw starter, the operator must act in this sequence:
- At first, the spring must be carefully twisted to the desired diameter;
- After that, the part must be carefully placed in the cavity of the metal hub of the factory drum;
- Next, the outer end of the twisted spring must be secured on the limiting factory notch. At the same time, the outer end of the part should be installed directly opposite the hole provided in the lock;
- Then the loop formed on the inner end of the part, using a screwdriver to align with the factory hole, and release the disk;
- After that it is necessary to turn the disk and check whether the ratchet dog is in its original place;
- At the end of the cover is installed starter housing.
After the operator has managed to wind the spring on the chainsaw starter. it is necessary to adjust its tension. To do this correctly, you need to carefully enter the cable into the groove on the standard circle, and twist the factory return piece around it. To tighten the spring. it is sufficient to wrap it around the drum for a few even extra revolutions.
The main faults of the grass trimmer starter
It is not difficult to determine the cause of the switch failure. There are several basic options:
It can happen that the starter mechanism is accidentally broken. The consequences will be deplorable, if the active internal combustion engine flywheel is wound with a wound cable: then the spring will burst, the pulley will break. But such cases, when a complete replacement of the starter is required, are extremely rare. In most cases, it is enough to put a new spring or replace the cord to fix the mechanism.
Prevention of problems
Sooner or later problems with the starter mechanism arise on any trimmer. STIHL FS 55, “MTD 790” or other brand. It is possible to delay the onset of such malfunctions, but to do so you need to handle the tool with care. In particular. you should not make too sharp jerks, this will lead to breakage of the cord or to the departure of the spring. It is not advisable to subject the lawnmower to shocks or other physical abuse. If the starter housing breaks and the cord breaks, it could wind around the engine flywheel. This will result in a torn sheave and a broken spring.
So, having found out that the starter mechanism on the chain saw is broken, it is not necessary to rush to the professionals for help right away. Knowing how to troubleshoot and / or replace a part, the repair work can be done by yourself. No special tool is needed for this. At first, the procedure may seem complicated and tedious, but numerous videos on the Internet devoted to repairing the starter will help to solve the problem as quickly and easily as possible.
Major lawn mower starter breakdowns
Currently there are two main malfunctions of the starter of the gasoline trimmer for grass are widespread:
Grass trimmer belt spring
In practice, there are cases where, for whatever reason, there is damage to the starter housing and the broken cord winds on the motor shaft, which will certainly lead to a breakage of the spring and cracks in the housing. In this situation, the local repair of the starter lawnmower will not be possible and will require a complete replacement of the engine starting unit. In other cases, troubleshooting will be reduced to replacing the spring or cord.
In order to match the cord fixing holes in the pulley and housing, you may have to make a few more turns. A new rope is put through the technological hole and make a loop or a knot: this will allow her to slip out of the pulley. The rope is taken aside so that it does not interfere with further work. Next you need to fix the pulley.
The soft starter spring is put in place. Husqvarna lawnmower starter kit. It can be used the old one, if it is not damaged. or a new one if necessary to replace it. On top of the spring set the starter clamp, which is secured with a special screw. It securely holds the clamp for a long time, preventing its warping and swaying. After that you need to make a few coils of rope and run it inside. The cover with the assembled starter is installed in place. Use screws to fix it.
After completing the repair and reassembly, you can begin to work. Self-repair of the starter does not take much time and does not require complex skills, but it saves time and money if you perform such work in the service center.
To be able to repair your chain saw you should do it with care and do it in good time, check the quality of fuel and oil you are using. These simple adjustments can increase the tool’s working life.
Husqvarna 128r brushcutter starter repair (modification). From the Private Home series.
A slight modification of the starter motor.
As with any garden or construction gasoline tools, the grass trimmer starter consists of a plastic housing, in which a pulley with a prewound cord (schmorglka) is installed. In order to automatically twist the rope after a jerk of the starter at the back of the pulley is fixed band spring made of alloy steel. A ratchet is mounted on the front of the pulley, which engages the starter motor with the drive shaft of the grass trimmer. Depending on the brushcutter manufacturer and design, the sheave with the ratchet may be a single piece or made of two separate parts.
The principle of operation of the grass trimmer starter is almost the same regardless of the model of the unit.
The main components of the grass trimmer starter
When the starter jerk the tabs on the pulley engage with the pawls, which diverge in different directions under the action of centrifugal forces if the engine is started successfully. There are also models where the ratchet is spring-loaded on the side of the body and the reverse rotation of the pulley is the removal of the teeth of the meshing from the motor shaft. Of course, with frequent and prolonged use of trimmer for grass, no one is immune to breakage of the drive cord or tape spring wear. Therefore, in this case it will be necessary to repair the starter trimmer for grass, which can be carried out with their own hands.
Currently there are two main malfunctions of the starter gasoline grass trimmer:
In practice, there are cases when for some reason the starter housing is damaged and the broken cord winds up on the motor shaft, which will certainly lead to the breakage of the spring and cracks on the housing. In this situation, local repair of lawnmower starter will not be possible and a complete replacement of the engine starting unit will be required. In other cases, troubleshooting will be reduced to replacing the spring or cord.
First of all, the repair process begins with the removal of the entire starter from the grass trimmer. This process is not inherently complicated and requires only unscrewing a few screws with a suitable locksmith tool. It should be noted that when dismantling the starting mechanism of the lawnmower it is necessary to observe safety precautions, because the belt spring in a compressed state has enough energy to injure a person.
This step allows the master to establish the causes of malfunction of the starting unit, as well as to make defects in individual parts. Perform disassembly work in the following order:
Removed spring from the starter coil
Many experts note that it is quite difficult to mount the spring at the first time, therefore, not only basic locksmith skills, but also patience will be required from the owner when repairing the starter trimmer for grass.
Although the process of reassembling the start node of the lawnmower is carried out in the reverse order of disassembly, there are several nuances to which you should pay special attention:
The coil with the installed spring must be turned over and mounted in the groove of the starter housing so that all the tabs are in their original place.
Installing the grass trimmer reel in the starter housing
Design and principle of operation of the starter motor on a trimmer
The gasoline engine is basically the main part of the brushcutter Its power lies in the range 0,5-2,5 l.с. It transmits the power to the shaft inside the hollow shaft, and then to the line or knife (operating device) through a gearbox made up of gears.
The lawnmower also has the following elements:
- Protective cover;
- crank handle;
- belt, designed for the convenience of using the device;
- the starter, which is used to start the internal combustion gasoline engine.
All parts of the brushcutter are shown in the photo below.
The starter on the trimmer is an integral part that performs engine starting. It is shown separately in the two photos below.
The starter mechanisms of the different models of petrol lawnmowers work on a similar principle: when the internal combustion engine starts, the lugs in the photo above marked with the number 1 engage in the catch with the pawls 3. When the engine is running, they return to their previous position because of the centrifugal force. Similar role is also performed by wires 2.
The resetting process of the mechanism elements is due to the presence of a spring wrapped around the axis. It unfolds when the cord is pulled. When the rope is released it retracts and winds up again because the spring unwinds. When the lawnmower’s engine starts, the starter mechanism rotates the shaft until it just starts working (starts up).
Today’s petrol brushcutters are equipped with two types of starter mechanisms:
The first option is much more common.
The starter on the trimmer can function for a long time without failure. It is not possible to state unambiguously the period of trouble-free operation. Everything is determined by the original quality of the machine and its proper handling.