How to put the plunger on the grass trimmer
The procedure for disassembling a gasoline saw:
- We unscrew the protective cover;
- Unscrew the candle;
- Remove the clips from the shock absorbers;
- We insert a cord into the spark plug hole to hold the crankshaft when unscrewing the clutch and the flywheel nut;
- Remove the asterisk;
- Next, remove the carburetor and air filter;
- We dismantle the ignition block and muffler;
- We take out the power unit;
- Remove the oil pan, remove the piston with the crankshaft;
- Disconnect the retaining rings from the finger;
- We outline the location of the piston in the cylinder.
Before starting the assembly, it is required to thoroughly clean all the components of the gasoline saw from carbon deposits and dust. Then wipe them with a clean cloth.
Install the piston to the crankshaft. We attach it to the connecting rod with your finger. We install retaining rings on the finger. We put the compression ring on the piston. Lubricate the inner mirror of the cylinder with oil, for better insertion of the piston with a ring into it.
The oil pan is reliably cleaned of dirt and oil. Then we wipe it with a clean cloth moistened with gasoline. Apply heat-resistant sealant to the pallet and fasten.
We assemble the gasoline saw in the reverse order.
How to properly install the rings on the piston of a two-stroke scooter
There is nothing difficult in installing rings on the piston of a two-stroke scooter, however, like a four-stroke scooter, and many know this.
But most of the scooters who have only recently acquired such a technique do not even have an idea of how to replace the piston on a scooter, how to properly install the rings on the piston, where the arrow on the piston should look, and much more.
In this lesson, I will tell you how to properly put the rings on the piston and assemble the piston into place. Since we have already spoken about four-stroke engines before, here we will only talk about two-stroke engines. So, our piston engine is worn out and needs to be replaced.
The rings and the piston are the first to wear out, and usually only need to be replaced. With severe piston wear, the cylinder must be bored. It also loosens when the piston wedges in the cylinder, forming deep scratches on the walls of the latter.
There is nothing wrong with that, and if your new cylinder has gone through the correct bore (for which you will need to pay only about 10), it will need a repair kit of rings with a new piston. Such rings are indicated by marking 0.25.
The second bore is 0.5, respectively, etc. to one.
After purchasing the piston, you need to assemble it. In the kit, as a rule, you will find the piston itself, two compression rings, a third thin corrugated ring (more on its purpose), a piston pin and two piston pin retaining rings.
Now about the third ring in the kit. Its purpose is to spring the lower compression ring. It installs it under it itself, and usually does not have any benefit during operation.
Use the saw stop as you slide the chain onto the chain to be properly tensioned. You can throw this ring away, or you can put it, there is no difference.
Ryobi String Trimmer Repair. How to replace the Plunger
Many piston manufacturers do not have one at all.
It’s time to put everything in place. Depending on the scooter model, the compression rings may be the same or differ in thickness and cross-section. Most pistons for Honda scooters, for example, have different rings, where the top is thinner than the bottom and has a different cross-section.
It is imperative to pay attention to this when installing, the top is thinner and sharpened at an angle.
Also pay attention to the inscription on the ring (usually the letter T or the size of the repair), the inscription should always be on top, that is, opposite from the finger. First you need to put on the bottom, then the top. In this case, you do not need to stretch and bend them. These manipulations must be carried out carefully.
There are locks in the ring grooves that prevent the rings from turning during operation, so the ring gap must be exactly in these locks, otherwise you will not stick the piston into the cylinder.
And the last important point is the arrow (1) on the bottom of the piston or the inscription EX. Both the arrow and the inscription must be directed towards the exhaust (2).
In this case, the ring locks will be on the side of the petal valve. How to choose a chainsaw (chain, tire, do you need to press on the chainsaw when cutting.
If the locks are placed in the direction of the exhaust, the piston will not last long, the rings will be pulled into the exhaust window and gradually grind it off.
When installing the piston pin, pay attention to the condition of the cage (bearing), it may need to be replaced.
Before installing the gudgeon pin, install the circlip on one side prior to installing the piston (usually on the side where you will not be comfortable with the pin and second circlip).
Then put the pin with the bearing and the second circlip, when it is fixed in the groove, it will make a certain click.
That’s all, now put on the cylinder, not the piston (remembering to check the condition of the gaskets and lubricating the piston and cylinder walls with engine oil), the cylinder head and tighten the bolts alternately in a crosswise order.
If you have any questions in the process of replacing the piston, you can ask them in the Комментарии и мнения владельцев field or on the forum of our website. How to correctly install the piston on the lawn mower. How. Good luck with the repair.
When a piston needs to be replaced
There can be many reasons why the piston needs to be replaced, as well as a completely piston one, but they can all be divided into natural ones and those arising from improper operation. Natural, this is the wear resulting from the long-term use of the STIHL 180 chainsaw. There are much more artificial ones, for example:
- overheating of the engine and the appearance of thermal seizures;
- ingress of a foreign body into the cylinder and the appearance of mechanical scoring;
- breakage of the piston ring as a result of exceeding the maximum engine speed;
- breakage of the piston skirt due to overspeed;
- the use of low-quality fuel, as a result of which the piston group of the chainsaw wears out from the side of the intake channel in the cylinder;
- operation of a STIHL chainsaw with a dirty fuel filter, as a result of which the percentage of oil in the fuel mixture is reduced;
It is necessary to diagnose the CPG if the STIHL 180 ms has suddenly lost power or does not start, while the starter of the tool does not turn. If the starter cranks, but the saw does not start, while there is a spark and the fuel enters the cylinder properly, it is necessary to measure the compression in the engine.
If there is a suspicion of problems with the CPG, it is advisable to contact a service center authorized by the manufacturer, since only there they can accurately diagnose the malfunction without full analysis and, if necessary, carry out a high-quality repair.
9.5. 11 atm. it is considered a normal indicator at which the STIHL chainsaw starts up properly and delivers maximum power, if the compression is lower, there is a possibility that there are scuffs on the cylinder-piston group, or its wear is quite large. In any case, with reduced compression, for further diagnostics, it is necessary to completely disassemble the saw.
It is possible to determine the presence of seizures on the piston, as well as a broken piston ring, if you remove the muffler and conduct a visual inspection of the visible part of the piston, while the rings can be checked for elasticity by pressing them with a small screwdriver. There will be slight movement on the working rings, a defective or jammed piston ring will not move.
Description of the piston group of the STIHL 180 chainsaw
On the STIHL 180 chainsaw, the piston group has a diameter of 38 mm. The dimension of the chainsaw CPG is determined by the piston diameter, the cylinder is slightly larger. As standard, the MS 180 CPG is supplied complete with a piston pin, two piston rings and two retaining rings.
The inner surface of the cylinder must be perfectly sanded and have a glossy sheen, which must be taken into account when purchasing a replacement cylinder head for a STIHL ms chainsaw. If there is damage to the inside of the cylinder, it is not necessary to install such a cylinder.
A distinctive feature of the CPG on the STIHL MC 180 is that it has two compression rings, while almost all of its main competitors have only one. According to the manufacturer, the installation of a pair of rings makes it possible to better stabilize the piston in operation, enhance its cooling and increase the compression in the engine, thereby improving starting.
Replacing the piston on the DOLMAR chainsaw
In the repair of the Dolmar 116 chainsaw. Installation of the piston. ? Write off gasoline, please tell me how to write off gasoline on a lawn mower and a chainsaw, if there is no exact calculation, then in fact and an act it is necessary to experimentally establish a rate. Find out more on our website: Subscribe.
Of course, nothing is eternal, but it is one thing if you change the piston group, after many years of operation and it has worked out its engine hours, fully paid for itself, and another thing is that this saw was refueled, for example, with gasoline, without oil, and it jammed. Such a saw has to be repaired, since all other parts are normal.
Many firms deliberately inflate the cost of spare parts in order to buy new models. Chainsaws and grass trimmers from, for example, STIHL have a wider range of spare parts than Husqvarna. Therefore, when choosing a certain model, find out how things are with spare parts.
We select spare parts for a Chinese chainsaw.
So, the chainsaw has been disassembled and the time has come to decide on a set of spare parts for replacement. To do this, you need to carefully inspect all the parts of the piston group and make a list based on its condition:
Piston rings. when worn or “buried”
Piston with rings for heat seizure
Cylinder. if there are scuffs on its surface
I would like to note that these saws are equipped with two types of piston groups, piston diameters 43 and 45 mm! over, they are interchangeable, that is, at will, the engine volume on a Chinese chainsaw can be increased or reduced, if the piston is changed.
In addition to the parts of the piston group, we recommend purchasing a set of gaskets, in these chainsaws they are of low quality, when disassembling the saws they often become unusable
- We remove the piston from the crankshaft, for this we dismantle the retaining rings (item 17), pull out (if necessary, “knock out”) the piston pin (item 18). Piston removed.
Carefully remove 2 washers (p. 72) and the crankshaft needle bearing (p. 73), remove to the side so as not to lose.
We clean the surface of the crankcase adjacent to the cylinder and the bottom of the cylinder from dirt and old gaskets. Degrease the surface (highlighted in the figure)
How to disassemble and reassemble the throttle grip of a Chinese brushcutter grass trimmer
If desired, lock the crankshaft using, for example, a rope.
Problems with the engine are caused by a discrepancy with the piston system, oil seals, rings. To remove them, you need to remove the drive motor.
Finding what exactly became the prerequisite for the breakdown is difficult. If there is a guarantee, the mechanism should be taken to a service center for diagnostics and repair. If you do not have the ability to turn to specialists for help, then it should be borne in mind that piston rings are often required to be replaced. For this purpose, it will be useful for you to disassemble the engine, get the piston. They do it in this order:
How to install a 15 carburetor in 15 minutes on your Echo String Trimmer
- remove the cover of the plastic case, unscrewing the screws in a different way by squeezing the clamps;
- disconnect the bar with the crankshaft;
- remove the cylinder head;
- take out the piston and rings;
- make their change as needed;
- make assembly in reverse order.
Rings should be installed carefully as they are quite fragile.
How the piston is installed and the oil seals are changed when repairing the motor is clearly shown in the video clips further:
Continuous use of the mower can break the gearbox. Here gears and bearings wear out (they also break, of course). For this to happen infrequently, this unit should be lubricated frequently. The frequency is often indicated in the operational annotation for the applied model (at least once a season). How the annotation of the repair will serve the video below.
To lubricate the gearbox, unscrew the plug and simply squeeze a suitable lubricant inside the unit by scrolling the shaft.
Without the help of others, the carburetor can only be removed and cleaned, and additionally changed the gasket between it and the engine. The density of the node at home is quite problematic to find. The main thing is to correctly assemble the equipment after repair, so that the grass trimmer works freely.
How to Assemble the Grass Trimmer Starter?
The main material for the production of trimmer knives you will like plastic versus metal. The introduction of such consumable parts in almost everything depends on 2 characteristics:
From the judgments of the safety precautions of the Russian car industry, it is not advised to put iron knives on electronic grass trimmers. All brushcutters powered by an electronic network and battery are equipped with plastic blades. Based on the manufacturer, they usually come in a solid disc-shaped design, with several blades or in the form of a special mowing head providing for the installation of removable plastic blades.
The straight bar for the petrol grass trimmer and the curved bar for the electronic
To put the iron knife on the electronic trimmer, its design features do not allow.
- The curved bar of the machine reduces the distance from its working part to the mower’s feet. For which the design of the collision of the blades with a stone or other hard object is intended, the grass scythe is thrown to the feet.
- The high torque we mentioned above, for which the iron blade-hard object collision design is designed, transfers a huge load to the flexible grass trimmer shaft and engine. What causes them to break early.
- The handle of the electric scythe in most cases does not have a limiting bar acting as a stop. Which does not exclude injury to the legs.
These features are used on trimmers with electronic engines only plastic knives. When colliding with an obstacle, the blades are destroyed, thereby protecting the mower’s legs from possible injuries.
Hacking a trimmer primer bulb to work again
Plastic knives handle well overgrown and dry grass. They can mow nettles and burdock trunks.
Repairing a gasoline engine, carburetor and gearbox
Engine problems can be caused by problems with the piston system, oil seals, rings. To eliminate them, it is necessary to remove the drive motor.
Determining what exactly caused the breakdown is not easy. If there is a guarantee, the mechanism should be taken to a service center for diagnostics and repair. If it is not possible to turn to specialists for help, then it should be borne in mind that replacement of piston rings is most often required. To do this, you need to disassemble the engine, get the piston. This is done in the following sequence:
- remove the cover of the plastic case by unscrewing the screws or wringing out the clamps;
- disconnect the bar with the crankshaft;
- remove the cylinder head;
- take out the piston and rings;
- if necessary, replace them;
- assemble in reverse order.
Rings should be installed carefully because they are fragile.
How the piston is installed and the oil seals are replaced during engine repairs is clearly shown in the videos below:
Regular use of the mower can break the gearbox. Gears and bearings wear out in it (they can also break). To prevent this from happening often, this unit should be regularly lubricated. The frequency is almost always indicated in the operating instructions for the model used (at least once a season). The video below can serve as a repair manual.
To lubricate the gearbox, unscrew the plug and simply squeeze out a suitable lubricant inside the unit by turning the shaft.
The carburetor can only be removed and cleaned on your own, and the gasket between it and the engine can be replaced. The tightness of the assembly at home is quite problematic to determine. The main thing is to correctly assemble the equipment after repairs so that the grass trimmer works without problems.
How to assemble a carver trimmer stick
Electronic grass trimmers differ from petrol units in their lighter design. Conventionally, the electronic braid is divided into mechanical and electronic parts. Accordingly, the same groups of problems that occur with this equipment are distinguished.
Most of the breakdowns cannot be visually identified. For this purpose, it is useful to use different devices. The following is visually determined:
- the integrity of the power cable is broken (insulation has been torn from it, or it is obviously broken);
- sinking in a different way jamming of the start button;
- external mechanical damage to the brushcutter;
- obstructions with the cutting part;
- stopping the spit for grass when clogging with grass;
- fork damage.
In order to find out which part has broken in other cases, it will be necessary to disassemble the electric brace and check the more possible options one by one. At the same time, external manifestations of deviations from the normal operation of the device are assessed. They help to establish the premise.
Repairing the electronic grass trimmer will require the following devices and tools:
- indicator screwdrivers;
- multimeter or tester;
- soldering iron;
- a set of keys;
- screwdrivers with various attachments.
Electronic scythes for grass often do not work due to circumstances not specifically related to having it, but caused by a decrease in the supply voltage in the network or an inoperative state of the outlet used.
Before disassembling and repairing the electronic braid, you should check the condition of the outlet and the voltage in the network. If its value deviates from the norms indicated in the annotation for operation, then it does not even make sense to try to work with a device without a stabilizer designed for an appropriate power.
How to disassemble and reassemble the throttle handle of a Chinese brushcutter grass trimmer
- Place the grass trimmer on a flat surface (such as a table) that does not contain unnecessary items.
- Unscrew the cover screws located on one side.
- Remove the unscrewed half of the case, gaining access to the start button, electric motor, brush assembly, bearings, electrical connections (these elements are shown in the photo below).
The brush and bearing units are shown in the photo below.
The grass braid will work even without a thermal relay, you just need to constantly independently check the temperature of the electric motor, periodically letting it cool down. You can also install a new similar sensor.
The start button of the electric motor can be checked by closing a jumper of its contacts. If the grass trimmer works, then the problem is clear. But this option is unsafe. Everything should be done carefully so as not to get an electric shock. To change the button, you should use a screwdriver to remove it from the seat and connect the wires from the old to the new one. After replacement, you need to assemble the electric brace, and then check its performance.
Replacement of brushes is required if they are destroyed. In this case, pull out the old enough from the grooves, and install the new ones in their place.
The connection terminals on different trimmer models are almost identical, so the connection and disconnection of the wires is the same.
Replacing the bearing is a rather difficult operation, because it can stick and not be removed from the motor shaft. Pull or knock it down carefully so as not to damage the rotor or seat.
When the grass trimmer motor fails and needs to be replaced with a new one, carefully remove the fan and bearings and then reinstall them. In terms of costs, replacement is almost comparable to purchasing a new mechanism. In the absence of experience in working with electric motors, it is better to entrust its implementation to specialists.
How to disassemble a knob-type interior door handle
It is not difficult to disassemble a door handle with a built-in knob-type latch. Most of these handles come with a special key for removing the head with a locking mechanism, but after several years of use, few people can remember where it is. Therefore, its function can be performed not by a thick screwdriver or even a nail.
They need to press on the latch in the hole on the side of the handle and at the same time slightly pull it towards you.
The next step will be to remove the protective cap, on the end surface of which there are small recesses. You can rest the tool in them and, using it as a lever, pull off this pad.
As a rule, during installation, for aesthetic reasons, they are placed at the bottom of the handle, so you have to grope them.
There is also the process of dismantling the round door handle.
The protective cover can be removed by poking it with a knife, but you need to be extremely careful not to damage the door leaf.
The photo also shows a special key for disassembly.
After removing the handle and the protective cap, access to the self-tapping screws of the entire handle mechanism opens. These are 3 or 5 screws. Two of them fasten the outer and inner parts of the lock together, and one fixes it in the door leaf with a self-tapping screw. The rest 2. serve as spare attachment points. Sometimes the design is limited to only 2 tie screws.
After unscrewing the self-tapping screws, the lock is disconnected and it can be removed from the latch.
The latch itself is attached in a recess from the end of the door with 2 self-tapping screws.
It makes no sense to describe how to assemble a door handle with a latch. everything is done in the reverse order, and the handle (even a push handle, even a round one) simply snaps onto the mechanism by simply pressing it until it clicks.
To help you, a small video of disassembling a rotary knob of the simplest design:
This process is even simpler than the one described above. The removal itself is made in literally a few movements and takes a few seconds.
On the outlet. the handle body, with which it is attached to the door leaf, which contains the entire mechanism shown in the photo at the top of the article and ensuring its operation. there is a protective cap on the thread.
It unscrews easily counterclockwise.
The handle is attached to the square with a clamping screw, which can be unscrewed either with a slotted or Phillips screwdriver, or with an L-shaped hex key. The latter, as a rule, comes with the handle itself.
The socket is untwisted in the same way as the body of the knob.
The video shows in detail the device of the socket handle itself and the action of the mechanism for limiting its pressure and returning to its original position:
How to assemble a door handle with a spring, after watching the video, even a not very technically savvy person will figure it out. The main thing is that after assembly there are no unnecessary parts left.
Quite often, annoying incidents happen with knob handles: either the child, having closed, cannot open them, or the fixing mechanism will break. A short video tutorial, we hope, will help you get out of this situation.
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