How to replace the piston on a trimmer

Repair of trimmers Huter

There are many things to consider when choosing a mower blade. For example, discs with metal teeth are often circular in shape. Teeth can be different in form, shape and size. For small trees and dense grass it is better to choose discs with more teeth.

It is worth to note such an advantage of milling disks for brushcutters as a fast speed gain. However, a high moment of inertia is not good for the drive unit. For dense mowing, for tall and small rough grass and bushes it is better to choose discs with 40 or more teeth and peoria.

Discs with a solid blade and without holes are heavy, so you should choose them for powerful trimmers (more than 40 cm3). Mowing sparse grass and brushwood is well suited to different mowing densities.

Pobedite discs are the right choice when mowing near obstacles. If you need to mow grass for hay, then you should give preference to steel knives with a large number of teeth with even sharpening. Solid discs with 16 to 32 teeth cut thick-stemmed plants well.

For low-power trimmers, paddle discs with a minimum moment of inertia are better. The smaller the blades, the harder the tool will shred the grass. Thus, discs with two blades are most often used for mowing homogeneous grass. The main advantage of this type is that it throws the cut plants aside.

When making hay, it is recommended to choose knives with four blades, so that the grass is not chopped.

Blade thickness is also important when choosing. Blades can be stamped or forged. The former have a low price, but can be severely damaged when encountering an obstacle. As for forged discs, they do not get chipped or sheared when they collide with hard objects.

For electric trimmers, choose only plastic blades. Their low weight prevents unnecessary stress on the motor. Soft plastic allows blades to bend or deform slightly, rather than break when hitting an obstacle. It is recommended to use these cutting elements for mowing thick, soft grass.

How to find a fault

The cause of a saw’s failure or degradation of its performance can be:

  • a clogged fuel tank cap breather;
  • Carburetor air intake due to destruction of the gasket or loosening of the threaded fasteners;
  • Mechanical blockage of removable saw equipment and other minor defects.

Before you disassemble it, make sure you need more extensive repair work.

You will most likely not be able to reassemble a new chain saw yourself after repairing it with the original quality. Modern chainsaws often use press-fit mating parts, which have minimal repairability.

Even a partial disassembly of a chainsaw with improvised tools can lead to undesirable consequences. In most cases, you can only remove a single part or system to correct a problem.

Repair cost of MTD chain saws and trimmers

Name of work Price in rubles
Diagnostics (in case of repair the diagnostics is not paid) 600
Comprehensive maintenance (consumables and labor) 1800
Reassembly of the engine 2500
Cylinder replacement 1500
Engine crankshaft replacement 2500
Spark Plug Replacement 100
Replace piston 1500
Piston ring replacement 1500
Engine oil seal replacement 1500
Intake tube replacement 300
Flywheel replacement 500
Flywheel key replacement 500
Clutch clutch replacement 500
Replacing the clutch drum 500
Clutch clutch spring replacement 500
Replace the dog/spring 300
Replace carburetor and adjusting 500
Magneto replacement 500
Muffler replacement 200
Crankcase Replacement 500. 900
Crankcase gasket replacement 500. 900
Replacing the fuel primer 100
Replacing the fuel tank 500
Replacement of the fuel hose 200
Fuel line/filter replacement 300
Air filter replacement 100
Gas cable replacement (removal and installation) 100
Gas trigger/block replacement 500
Replacing the high voltage wire 500
Replacing the recoil starter 500. 1000
Starter Spring Replacement 500
Starter rope replacement 600
Ignition switch replacement 200
Replacing the boom 500
Shaft/rod replacement 200
Replacing the protective cover 100
Blade Replacement 100
Bobbin Replacement 100
Replacing the line in the bobbin 100
Gearbox replacement 300
Manual Starter Repair 500. 1500
Carburetor Repair 600. 2500
Adjusting the carburetor 500
Adjusting throttle cable 100
Valve adjustment 1400
Fuel system cleaning 600. 800
Gear lubrication 100

We are responsible for the results of our work, testifying that our words and deeds do not differ!

Gardening Equipment Repair and Service.

Specialized service center “Agrotehservice”. comprehensive warranty and after warranty service of gardening and municipal equipment of world manufacturers! We carry out sale of spare parts with delivery across all Russia!

replace, piston, trimmer

How to change the piston on the trimmer.

In this video I will show how to independently, quickly change the piston on the trimmer. I will change it on the trimmer.

Pridonok shows and tells you how to install the piston in the cylinder on the scooter and motorcycle

Small Engine Top End Repair: Removing the Piston on a Echo 2 Stroke Engine

Now for the third ring in the kit. Its purpose. to spring the lower compression ring. It is installed under it actually, and usually does not bear any usefulness in the process of operation. You can throw this ring out or put it in, there’s no difference. How to properly install a piston on a chainsaw. Many piston manufacturers do not have it included at all.

It’s time to put it back together. Depending on the scooter model, the compression rings may be the same or vary in thickness and cross section. Most Honda scooter pistons, for example, have different rings, where the top one is thinner than the bottom one and has a different cross-section.

It is necessary to pay attention to this when installing, the upper one is thinner and beveled at an angle.

Also pay attention to the inscription on the ring (usually a letter T or repair size), the inscription should always be on top, that is opposite to the finger. The lower one should be put on first, then the upper one. It is not necessary to stretch and bend them. These manipulations should be performed carefully.

In the grooves for the rings are locks that prevent rotation of the rings during operation, so the gap rings should be in these locks, otherwise the piston in the cylinder you will not stick.

And, last but not least, there is an arrow (1) at the bottom of the piston or the EX lettering. Both the arrow and the lettering must always point toward the exhaust (2). In that case, the ring locks will be on the petal side of the valve. How to put the piston on the chainsaw correctly. How to Properly. If you put the locks on the side of the exhaust, the piston will not last long, the rings will be pulled into the exhaust window and gradually wear it down.

Read more:  How to Make a Coil From a Trimmer

The right piston for the grass trimmer

Repairs at this level should always be deliberate. In such small engines operating at high revolutions, replacement of one piston, which has burned out or jammed, does not give long lasting results and if necessary the entire piston group should be replaced. So it is necessary to think over whether to use this saw further or to buy a new one.

If it is a professional model, such repair is worth doing, but if it is an old domestic model like Husqvarna 40 and it has been working for more than ten or twelve years, it is not worth repairing. Because its repair will cost the same as the purchase of a new saw, let it not Husqvarna, but it will be enough for PARTNER P350XT CHROME, value 165. over, such saws are sold by the company Husqvarna, since PARTNER is its affiliate.

How to Change the Piston Ring on a Stihl FS56 & 56R Brushcutter | L&S Engineers

But if you do decide to repair your chainsaw or grass trimmer, then you need original spare parts, which are not cheap. If the engine is used properly, the first repair will not happen soon, and you will only have to replace the piston ring or rings, depending on the model. But if the saw jams, it is necessary to change the whole piston group. cylinder, piston and rings.

It should be noted that chainsaws Husqvarna 136/141 have approximately 500-600 hours service life, Husqvarna 340/350. 1000-1200 hours, professional chainsaws have at least 2000-2500 hours, provided the strict observance of instructions for use. In fact, it is impossible to rely on these figures, because the actual service life may vary significantly upwards and downwards. But we can say approximately that semi-professional saws work 3-4 times longer then amateur saws, and professional saws work up to 10 times longer.

Of course, nothing is eternal, but it is one thing if you change the piston group, after many years of operation and it worked out its motor-hours, fully paid for itself, and another thing is that this saw was filled with for example one gasoline, without oil, and it jammed. Such a saw has to be repaired as all other parts are normal.

Many companies specially overestimate the cost of spare parts to buy new models. You can find more replacement parts for STIHL chain saws and brush trimmers than for the Husqvarna, for example. So when choosing a certain model, what is the deal with spare parts?

In the form of

Repair of such a level should always be weighed. How to properly install the rings on the piston of a two-stroke. In such small engines operating at high rpm, the substitution of the 1st piston that has burned out or jammed, gives not a long result and as the need to change the entire piston group. You should therefore consider whether to continue using the saw or to buy a new one.

If it is a professional model, it is worth such a repair, but if it is an old domestic model such as Husqvarna 40 and it has worked for more than ten or twelve years, it is not worth repairing. Because it’s going to cost that much to repair. The same as buying a new saw, let it not Husqvarna, but it is enough for the PARTNER P350XT CHROME, priced at 165. over, such saws are sold by company Husqvarna, because PARTNER is its affiliate.

But if you do decide to repair a chainsaw or a trimmer for grass, you need original spare parts, which are not cheap. If the engine is used properly the first repair will not come soon and you will only have to replace the piston ring or rings, depending on the model. But if the saw jammed, you need to change the whole piston group. cylinder, piston and rings.

It should be noted that chainsaws Husqvarna 136/141 have approximately 500-600 hours, Husqvarna 340/350. 1000-1200 hours, professional chainsaws not less than 2000-2500 hours with strict observance of instructions for use.

In fact, you can’t rely on these figures, because the real life can vary significantly up and down. But it’s possible to say approximately that semi-professional saws work 3-4 times longer then amateur saws, and professional saws work up to 10 times longer and more.

Of course nothing is eternal, but it is one thing if you change the piston group after years of use, and it worked its motor-hours and paid off, and another thing is that the saw was filled with gasoline without oil, and it jammed. Such saw has to be repaired because all other parts are normal.

Many companies specially overestimate the cost of spare parts to buy new models. STIHL chain saws and grass trimmers, for example, have a wider range of spare parts than Husqvarna. That’s why when choosing a certain model you have to know about the spare parts.RVT

How to install the rings on the piston of a two-stroke scooter correctly

In the installation of the rings on the piston of a two-stroke scooter, however, as well as a four-stroke, there is nothing complicated, and many people know it. But most scooterists who have only recently acquired a similar technique, do not even have an idea of how to change the piston on a scooter, how to properly install the rings on the piston, where to look arrow on the piston and much more.

In this lesson, I’m going to tell you how to put the rings on the piston and put the piston back on. Since we’ve already talked about four-stroke engines before, we’re only going to talk about two-stroke engines here.So, our piston is worn out and needs to be replaced.

The rings and the piston are the first to wear out, and usually only these need to be replaced. If the piston is badly worn, you need to re-bore the cylinder. It is also being reamed if the piston is stuck in the cylinder, creating deep scratches on the cylinder walls.

There is nothing wrong with it, and if your new cylinder has been properly bored (for which you will need to pay only about 10), it will already need a repair set of rings with a new piston. Such rings are marked with a 0.25. The second bore is respectively 0.5 and t.д. up to one.

After you buy a piston, it needs to be assembled. Kit usually includes the piston itself, two compression rings, a third thin crimp ring (more on that later), a piston pin and two piston pin retaining rings

The abrasive disk does not cut. Abrasives: powders, bars, wheels and belts. Metal Forum

How to change the piston on a trimmer.

In this video I will show how to independently, quickly change the piston on the trimmer. How to properly install rings on a two-stroke scooter piston Published 25.08 I will change it on the trimmer.

How to put the piston correctly

Pridonok shows and tells how to install the piston in the cylinder on a scooter and motorcycle

Read more:  Trimmer "Mtd-600": Repair Advice.

Now about the third ring in the kit. Its purpose is to spring the lower compression ring. It is installed underneath, and usually does not have any benefit in operation. You can throw that ring out or put it in, there is no difference. Many piston manufacturers do not include it at all.

It is time to reassemble everything. Depending on the scooter model, the compression rings may be the same or vary in thickness and cross section. Most pistons for Honda scooters, for example, have different rings, where the upper is thinner than the lower and has a different cross-section.

You have to pay attention to this when you install it, the top one is thinner and beveled at an angle.

replace, piston, trimmer

Also pay attention to the inscription on the ring (usually a letter T or repair size), the inscription should always be on top, that is opposite of the finger. Put the lower one on first, then the upper. There is no need to stretch and bend them. This manipulation should be done carefully.

In the grooves for the rings are locks that prevent the rotation of the rings during operation, so the gap rings should be in these locks, otherwise the piston in the cylinder you will not stick.

And last and not least, there is an arrow (1) on the bottom of the piston, or the EX inscription. The arrow and the inscription must always point towards the exhaust (2). In that case, the rings’ locks will be on the petal valve side. If you put the locks towards the exhaust, the piston will not last long, the rings will be pulled into the exhaust window and gradually wear it down.

At all manipulations with the piston, you must put a cloth in the crankcase window to prevent anything from getting there, we need the crankshaft and bearings.

When installing the piston pin, pay attention to the condition of the cage (bearing), it may be necessary to replace it. Before installing the piston pin, install the retaining ring on one side before installing the piston (usually the side where you will not be comfortable inserting the pin and the second retaining ring). Then put the pin with the bearing and the second circlip, when it locks in the groove it will make a certain click.

In the form of

Repairing this kind of saw has to be done with care. How to install the rings on the piston of a two-stroke In the installation of rings on the piston. In such small engines operating at high rpm, the substitution of the 1st piston that has burned out or jammed, does not give long results and as the need to change the entire piston group. So you need to think about whether to keep using this saw or buy a new one.

If it’s a professional model, it’s worth such a repair, but if it’s an old household model like Husqvarna 40 and it has been working for more than ten or twelve years, it’s not profitable to repair it. Because it costs that much to repair. as well as the purchase of a new saw, let it not Husqvarna, but on PARTNER P350XT CHROME, costing 165 exactly enough. And these saws are sold by the company Husqvarna, because PARTNER is a subsidiary of the company.

But if you do decide to repair your chainsaw or grass trimmer, then you need original spare parts, which are not cheap. If the engine is used properly the first repair will not come soon and you will only have to replace the piston ring or rings, depending on the model. But if the saw jammed it is necessary to change all piston group. cylinder, piston and rings.

It is necessary to notice that chainsaws Husqvarna 136/141 have approximately 500-600 hours service life, Husqvarna 340/350. 1000-1200 hours, professional chainsaws at least 2000-2500 hours, subject to strict observance of the instruction manual.

In fact, it is impossible to rely on these figures, because the actual life can vary significantly upwards and downwards. But approximately we can say that semi-professional saws last 3-4 times longer than amateur saws, and professional saws last up to 10 times longer.

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 its hours and fully paid for itself, and another thing is that this saw was filled with e.g. one gasoline, without oil, and it jammed. Such a saw has to be repaired because all other parts are normal.

Many companies specially overestimate the cost of spare parts to buy new models. At chain saws and trimmers for grass, for example, by STIHL, spare parts are available in a greater range than for Husqvarna. That’s why when choosing a certain model you need to know about the spare parts.RVT

replace, piston, trimmer

How to properly install the rings on the piston of a two-stroke scooter

To install the rings on the piston of a two-stroke scooter or a four-stroke scooter is nothing complicated, and many people know it. But most scooterists, who have only recently acquired a similar technique, do not even have an idea about how to replace the piston on a scooter, how to properly install the rings on the piston, where should the arrow on the piston and much more.

In this tutorial, I will tell you how to put the rings on the piston and assemble the piston in place. Since we already talked about four-stroke engines, here we will talk about two-stroke engines only.So, our piston is worn out and needs to be replaced.

First of all the rings and the piston wear out and usually you only need to replace them. If the piston is badly worn, it is necessary to re-bore the cylinder. It is bored also in that case, when the piston wedges in the cylinder, forming deep scratches on the walls of the latter.

There is nothing wrong with this, and if your new cylinder has been properly bored (for which you will only have to pay about 10), it will already need a repair set of rings with a new piston. Such rings are marked with the 0.25. The second bore is 0.5 and higher, respectively.д. up to one.

After purchasing a piston, it needs to be assembled. In the kit, as a rule, you will find a piston itself, two compression rings, a third thin crimp ring (its purpose later), piston pin and two piston pin retaining rings

The abrasive disk does not cut. Abrasives: powders, beads, discs, and bands. Metal forum

How to change the piston on the trimmer.

In this video I will show you how to independently, quickly change the piston on the trimmer. How to properly install the rings on the piston of a two-stroke scooter Published 25.08 I will change the piston on my trimmer.

How to put the piston in the right way

Pridonok shows and tells how to install the piston in the cylinder on the scooter and motorcycle

Now for the third ring in the kit. Its purpose is to spring the lower compression ring. It is installed underneath, and is usually of no use during operation. This ring you can throw away or you can put in, there is no difference. Many piston manufacturers do not have it in the kit at all.

Read more:  "Black&Decker GL 716": How To Replace The Trimmer Head?

It’s time to put everything back together. Depending on the scooter model, the compression rings may be the same or vary in thickness and cross section. Most Honda scooter pistons, for example, have different rings where the top is thinner than the bottom and has a different cross section.

You have to pay attention to this when installing, the upper one is thinner and beveled at an angle.

Also pay attention to the inscription on the ring (usually a letter T or repair size), the inscription should always be on top, that is opposite to the finger. You have to put the lower one on first, then the upper one. There is no need to stretch and bend them out. These manipulations have to be done carefully.

In the grooves for the rings are locks that prevent rotation of the rings during operation, so the gap rings should be in these locks, otherwise the piston in the cylinder you will not stick.

And the last important point is the arrow (1) at the bottom of the piston or the EX inscription. The arrow and the lettering must always point towards the exhaust (2). In this case, the ring locks will be on the petal valve side. If you put the locks in the exhaust side, the piston will not last long, the rings will be pulled into the exhaust window and gradually wear it down.

For all the manipulation with the piston, you should definitely put a rag in the crankcase window so you don’t accidentally catch anything, we still need the crankshaft and bearings.

When installing the piston pin, pay attention to the condition of the cage (bearing), you may need to replace it. Before installing the piston pin, install the retaining ring on one side before installing the piston (usually on the side where you will not be comfortable with the pin and the second retaining ring). Then put the pin with the bearing and the second circlip, it will make a definite click when it locks in the groove.

How to change the piston on the trimmer.

In this video I will show you how to independently, quickly change the piston on the trimmer. I will change it on the trimmer.

Pridonok shows and tells how to properly install the piston in the cylinder on the scooter and motorcycle

Now for the third ring in the kit. Its purpose is to spring the lower compression ring. It is installed under it actually, and usually not of any use during operation. This ring you can throw away or you can put in, there is no difference. How to properly install the piston on a chainsaw. Many piston manufacturers do not have it included at all.

It’s time to put everything back together. Depending on the scooter model, compression rings may be the same or differ in thickness and cross-section. Most Honda scooter pistons, for example, have different rings, where the upper is thinner than the lower and has a different cross section.

You have to pay attention to that when you install it, the upper one is thinner and is beveled at an angle.

Also pay attention to the inscription on the ring (usually the letter T or repair size), the inscription should always be on top, that is opposite of the finger. First you need to put on the bottom one, then the top one. There is no need to stretch or bend them. These operations must be performed carefully.

In the grooves for the rings there are locks that prevent rotation of the rings during operation, so the clearance of the rings must be in these locks, otherwise you can not stick the piston in the cylinder.

And the last important point, the arrow (1) at the bottom of the piston or the EX inscription. The arrow and the lettering must always point toward the exhaust (2). In this case, the rings’ locks will be on the petal valve side. How to put the piston on the chainsaw correctly.

At all manipulations with the piston, it is necessary to put a rag into a crankcase window to prevent something from getting there, because we need the crankshaft and bearings.

When installing the piston pin, pay attention to the condition of the cage (bearing), it may need to be replaced. Before installing the piston pin, install the retaining ring on one side before installing the piston (usually the side where you won’t be comfortable putting the pin and second retaining ring in). Then put the pin with the bearing and the second circlip, it will make a definite click when it locks in the groove.

That’s it, now put the cylinder, not the piston (remember to check the condition of the gaskets and lubricate the piston and the walls of the cylinder with motor oil), the cylinder head and tighten the bolts alternately in a crosswise order.

How to change the piston on the chain saw STIHL 180

If there is a desire to replace the old piston does not install the latest, you should know how to do it correctly do not observe a certain method of action. Also a small slotted screwdriver, a special STIHL combination wrench, a power screwdriver, a hammer, a soft hammer, a compressor and a STIHL piston lock.

Getting to work on replacing the piston or other piston assembly, the chainsaw must be cleaned with the highest quality dirt. Next, the work is carried out according to the following method:

  • The top cover is removed from the saw does not turn out the spark plug.
  • Remove side cover.
  • Use a power screwdriver to remove the stoppers from the chain saw’s shock absorbers, and then disconnect its handle from the body.
  • Next, you need to remove the drive sprocket and the starter.
  • Insert the piston plug into the spark plug hole and undo the flywheel nut and the clutch.
  • Remove flywheel, clutch and oil pump worm drive mechanism, which is located behind the clutch.
  • Unscrew the two screws that fix the carburetor and the air filter. Remove the filter, engine control lever and STIHL carburettor.
  • Remove the ignition coil and muffler.

After all these operations are done, it is necessary to clean the saw from dirt, then turn it over with the bottom up and unscrew the four screws fixing the engine to the chainsaw body. After removing the screws the engine is separated from the body and cleaned again.

With the engine removed, unscrew and remove the sump, then remove the piston and crankshaft assembly from the engine.