Reasons for power loss in brushcutter. Lawn mower does not develop full power
Any person, owning a garden or a plot of land, is well aware of the problems of dealing with excessive vegetation. Now came the grass trimmer, which has successfully replaced the usual scythe in this field. This unit is very convenient in operation, but it, as well as any mechanism, due to hard working conditions or incorrect operation is characteristic of failure. Situations when the grass trimmer does not gain momentum are quite common. To understand this problem, it is necessary to understand some aspects related to the functioning of the machine.
All grass trimmers are classified according to the type of power: gasoline or electricity (from the network or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many ways. Despite the fact that they all perform similar functions, the difference in performance, agility and efficiency is very noticeable. However, the general principle of operation of all types of manual mowers is almost the same. the devices are equipped with engines (two- or four-stroke engines or electric motors), which set in motion the cutting unit (spool with a fishing line or a metal disc). All elements are mounted on a straight or curved boom, including the trimmer control handle, which holds the main buttons.
Since the problem of weak revolutions is more typical for gasoline versions of trimmers, they will be given more attention. Thus, the lawnmower is very comfortable in operation and unpretentious in service. In this case, most of its faults are caused by the user’s ignorance of elementary things, which are written about in the manual. Therefore, before proceeding to operate the machine, it is necessary to carefully study the manufacturer’s manual. In particular, to start the engine, it is necessary to do the following sequential steps:
- turn on the ignition button;
- press several times on the silicone button to pump the gasoline;
- close the air damper;
- set the throttle lever to the high rpm position;
- first make some light jerks with the starter handle to feel the engine’s resistance, then yank sharply.
If the lawnmower starts but stalls, you need to put the choke in the middle position and try again. When the engine starts, you need to turn off the gas and open the air damper, as the grass trimmer only works on the suction.
Important! The operation mode of the grass trimmer depends on various environmental influences. In hot weather, the machine needs more time to cool down. When working in dense thickets or high vegetation, the engine also overheats strongly. It is necessary to make five minute breaks every 15-20 minutes.
Causes of poor grass trimmer rpm
If users complain about the grass trimmer, which does not pick up speed, it means that at idle it works fine, but when you press the gas does not develop the necessary power. This can occur as a result of long idle time without activity. These problems are typical for gasoline-powered machines, including Husqvarna 128r, STIHL FS 38 and Hitachi different modifications.
When working with a trimmer, you need to monitor its behavior all the time. a drop in rpm and unusual noises signal malfunctions in the machine. Sometimes you give the gas and the grass trimmer floats. In such cases stop working immediately, allow the machine to cool down, and check for possible problems. They can be of different nature, both technological plan, and external factors associated with the conditions and characteristics of the operation of the machine.
External factors
Several factors that are not related to the mower’s breakdown have an impact on the decrease in lawnmower speed:
- Contamination of the filter due to penetration of dirt and dust particles into it;
- Use of low-quality fuel;
- incorrectly prepared mixture (important for trimmers with two-stroke gasoline engines);
- Contamination of the muffler screen with particles of vegetation, soil elements and other objects.
In the second and third cases, this causes fouling in the combustion chamber and clogs the carburetor components.
Technical malfunctions
Technical problems with the mower are mainly caused by the fuel system and the ignition. It is possible to cope with them yourself.
- When the hand mower won’t start or stalls, the problem could be related to the spark plug. Dark soot indicates poor carburetor adjustment and poor gasoline quality.
- The cause of incorrect operation of the grass trimmer can be a clogged fuel hose. Filters also tend to get clogged.
- Another internal problem. the muffler is covered with soot. The grass trimmer revolutions drop drastically. The way out. you need to clean the muffler.
Important! If the machine is not working due to an engine breakdown, there may be serious problems. In this case, the faults that can be eliminated with your own hands include only the destruction of piston rings. For more serious engine problems and without warranty you should be prepared for a visit to a workshop.
Technical information and features
Thanks to the manual fuel pump, a person will easily be able to pump fuel into the carburetor. This is especially important if the STIHL petrol mower has been sitting idle for a long time. A permanent refilling of fuel ensures that the machine is quickly jump-started even after a “long vacation.
The machine comes with safety glasses and a mowing head. To understand the features of the assembly and other specific points of operation, you can thanks to the manual presented on our website.
Other useful information can be found in the following document:
The STIHL FS 38 boom with rounded handle is noteworthy. Thanks to its design, the device is easy to clean up, even in tight or confined spaces.
All controls are located on a comfortable handlebar, so you don’t have to look for where and what to switch. This is a very important moment during work, because the operator can not get distracted and adjust the machine without unnecessary movements.
Adjusting the carburetor on the STIHL FS 38 lawnmower
Figuring out all the procedures is not difficult, the main thing is to take the matter seriously and tune in to work. And many owners note that you can not only adjust the carburetor, but also replace parts by yourself. Low powered circuits will be great helpers in this case.
Grass mowing tools
A large number of different tools are designed for processing grass areas. Choosing such equipment, you need to get acquainted with the range of products. STIHL has the following types of gasoline-powered machines:
- FS 38, FS 45 C-E, FS 50 C-E, FS55, FS.
- Powerful models FS 70 C-E, FS 94 RC-E, FS 100, FS 120, FS 130, FS.
- Cordless grasshopper.
- Mains powered.
- Trimmers.
- Shank grass trimmers.
Gasoline grass trimmers of this brand are very popular. Choosing equipment, you need to know all the features of a particular model.
Gasoline grass trimmer FS 55
This model is a lightweight line of grass trimmers at this price is fully justified, especially if you use knives with a tipped. Performance increases to such an extent that the fuel runs out after just one hour of work. Everything in the trimmer is well thought out and perfectly balanced. This explains its popularity among buyers in many countries. Reliable and easy-to-use internal combustion engine with 27.2 cubic centimeters of displacement is at the heart of the construction. There is a special chrome coating inside to increase wear resistance. The result is long product life.
The carburetor has been optimized with years of experience to prevent clogged tubing. A manual pump makes it easy to pump gasoline during the cold start of the engine.
An electronic ignition system in a sealed casing is provided to ensure that the grass trimmer starts up immediately in any, even the most difficult circumstances. The use of overvoltage support makes for fast spark formation and long combustion, reducing exhaust emissions.
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The STIHL FS 55 brushcutters have been designed with an effective damping system to increase operator comfort. It attenuates engine vibrations even when mowing sloping terrain.
All components are made from high quality, durable materials. Straight boom is made of forged steel. This allows you to carry a significant load at consistently high blade or line speeds. For maximum precision and performance during mowing, the grass trimmer is equipped with an ergonomic bike handle. For convenience, it has anti-slip rubber handles. One of them is a control center with switches that regulate the operation of the device. That makes it possible to use the brushcutter with one hand.
The popularity of the grass trimmer of this model is due to its versatility and convenience:
- Engine power of 1 horsepower.
- Tank capacity 0.33 liters.
- The maximum cutting width is 0.4 meters.
- Grass trimmer length 1.7 meters.
- Weight 5 kilograms.
- Noise levels up to 90 dB.
Despite its relatively high power, the fuel consumption is only 150 milliliters per hour. And this at maximum load, which brings this grass trimmer among the leaders among similar tools.
The STIHL FS 55 lawnmower can mow smaller and medium-sized lawns in the garden or around the house. It can also cope with young, wild weeds. Small dimensions allow using this grass trimmer in tight spaces: around fences, on walkways, around landscape plants and in other hard-to-reach places.
Great sales are not only due to the technical characteristics and versatility It is necessary to note the components, which are in the set of delivery of the unit:
- Proprietary AutoCut head. It uses a heavy-duty trimmer line.
- Forged steel blades.
- Safety glasses made of plastic.
- A shoulder strap for easy carrying and mowing.
- Set of tools for maintenance.
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For mowing dry grass up to 0.25 m high and weeds with hard trunks, you can buy a two-blade blade.
Gasoline grass trimmer FS 55
This is a lightweight model of the line The grasshopper is well worth the price, especially if you use knives with a tipped blade. Productivity grows to the point where fuel runs out after only an hour of work. Everything in the trimmer has been thought out to the smallest detail and is as balanced as possible. This explains its popularity among buyers in many countries. Reliable and unpretentious internal combustion engine with 27.2 cubic centimeters of displacement is the basis of the design. There is a special chrome coating inside to increase wear resistance. As a result the service life of the product is extended.
Considering many years of experience, the carburetor was redesigned to prevent clogging of the tubes. A manual pump makes it easy to pump gasoline when the engine is cold.
To ensure that the grass trimmer starts instantly in all, even the most difficult circumstances, there is an electronic ignition system in a sealed housing. Use of overvoltage support allows rapid spark formation and prolonged combustion, reducing exhaust emissions.
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STIHL FS 55 brushcutters have developed an effective cushioning system to make it more comfortable to use. It dampens engine vibration even when mowing areas with a large slope.
High-quality, durable materials are used for all components. Straight bar made of forged steel. It can carry a considerable load at a consistently high blade or line speed. For maximum precision and performance during mowing, the Grass Trimmer is equipped with an ergonomic bike handle. For convenience, it is equipped with anti-slip rubber grips. One of them is the control center with switches that regulate the operation of the device. It has a cutting length of 10 ft. It enables one-handed operation of the brushcutter.
The popularity of the grass trimmer of this model is due to its versatility and convenience:
- Engine power of 1 horsepower.
- Tank capacity 0.33 liters.
- Maximum cutting width 0.4 m.
- Grass trimmer length 1.7 m.
- Weighs 5 kilograms.
- Noise levels as low as 90 dB during operation.
Despite the rather high power, fuel consumption is 150 milliliters per hour. And it is at maximum load, that makes this grass trimmer one of the leaders among similar tools.
The STIHL FS 55 lawnmower can mow smaller and medium-sized lawns in the garden or around the house. It will also cope with young wild weeds. Small size allows this grass trimmer to be used in tight spaces: near fences, on walkways, around landscape plants, and in other hard-to-reach places.
It is not only the technical characteristics and versatility that account for its large sales:
- Proprietary AutoCut head. It uses a high-strength trimmer line.
- Forged steel knives.
- Protective goggles made of plastic.
- The shoulder strap makes it easy to carry and mow.
- Service tool kit.
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For mowing dry grass up to 0.25 m high and weeds with hard trunks, you can buy a double-blade blade.
Instructions for users
Any gasoline-powered tool needs a pre-run-in phase before use. At this time the lapping of moving parts to reduce resistance is performed. Since this step takes place at low speeds, it is easier for a beginner to master such equipment.
Before starting the work, the mixture should be prepared. Its parameters and the materials used are specified in the technical documentation for the product. It looks something like this: Mix 2.5 liters of 95° gasoline with 100 grams of STIHL oil from the red package. This procedure should be carried out in a container that is resistant to corrosive liquids. A simple metal canister is not suitable because of rusty areas that cannot be detected inside. Corrosion particles in the carburetor clog the carburetor, causing the part to malfunction.
To run the brushcutter for 3 to 4 hours, with no more than 15 minutes idle. Every now and then you have to start for about 20 seconds to 30 seconds. During this time you can let the trimmer do some light-duty work.
During the warranty period the lawnmower needs service and adjustment of the carburetor. Have this work done by an authorised service partner.
What mowing heads should I use with my petrol-powered lawnmower?
Two types of cutting attachments or cutters are used in the design of chain saws. These are spools of fishing line and steel or plastic discs. What’s the best choice for your petrol-powered brushcutter? On this site you can find information on how to choose discs and fishing line for trimmers, as well as their types and design features. Let’s see briefly what kinds of cutting blades should be used on trimmers and gasoline cutters.
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For mowing soft grass, a line for the trimmer is used, which is wound on a drum or spool. unlike metal disks, the line for trimmer is used where grass grows near trees, houses, fences, and other obstacles. The line for trimmer allows you to make a quality mowing of grass near obstacles, while not violating the construction of the tool
The choice of cutter bar depends on where the tool is used. If it is planned to work in the homestead area, then the line for the trimmer is selected, and for mowing grass in the field or steppe, discs with 3-4 blades and more are used, as well as discs with small teeth.
This is interesting! In most cases, cutters do not come with a tool, so the buyer can decide for himself what he needs. a line for the trimmer or a steel disc.
Why the Chinese lawnmower does not develop revolutions?
If, however, you have done the filter, but the work of trimmer for grass, working on gasoline, has remained the same, gasoline trimmer does not gain speed what to do?
Then you should try removing the filter from the unit to provide what’s called “lightening” of the grass trimmer. lawnmower does not pick up speed, why the Chinese STIHL gasoline trimmer fs. Should help.
The next and quite common problem with gasoline trimmer is that it just stops, and does not give any signs of life.
In this case, the problem may be as follows:
The last and most common reason for the breakdown of a gasoline grass trimmer is that the cable, which is located in the carburetor department, simply slept.
Therefore, make sure in advance that it is well stretched, but not to the limit, otherwise with too much load on the gasoline grass trimmer, this small cable can crack and then you will definitely have to go to the service center, and then also throw a lot of money down the drain.
If everything is all right with the electrics, we check the carburettor.
There are vacuum carburetors on grass trimmers. When dismantling, cleaning or flushing it you must be very attentive and in no case dismantle the lower part of the carburetor where the primer is. The air filter (it is visible if you remove the protective cover from the carburetor) should be washed with detergents. It is best for washing dishes. After drying we put it back. Flush the carburetor with clean gasoline and blow out all the holes with a pump. Clean the gasoline filter also, then dry and assemble everything. Usually after all the manipulation grass trimmer begins to work.
A thin rope instead of a fishing line. is it worth putting it on the brushcutter??
The idea occurs to almost everyone who has mowed 10 acres overgrown with tall grass. At first glance, the idea seems like a good one. Cable is stronger than fishing line, it doesn’t wear out as much. However, it’s not all that simple.
Electric grass trimmer vibrates
Many users of mowers noticed that after some time after starting the machine, it begins to vibrate strongly. Some trimmers, mainly in more expensive models, have an anti-vibration system in the form of shock absorbers placed between the engine and the boom. But in some cases even it does not save from strong vibrations. The reason that there is a strong vibration in the trimmer can be a small amount or complete lack of lubrication on the rigid or flexible shaft, which is located inside the boom of the machine.
Changing the lubrication of the hard shaft is as follows:
- Apply a small amount of grease to the shaft and spread it evenly over the entire length of the part, including the splines on the ends of the rod (if they are worn out, the shaft will have to be replaced);
- After lubrication put the shaft back in the boom and put the gearbox back where it was before.
Lubricate the flexible shaft as follows
- unscrew and remove the mowing head;
- Remove the rod from the motor by unscrewing a couple of bolts;
- Remove the flexible cord from the boom;
- Grease the entire length of the cable.
To do this: first lubricate the end of the flexible cord and then insert it into the shaft and apply the lubricant as you move it inside the pipe, spreading it evenly over the surface. Then insert the rod with the flexible shaft into the electric motor and secure it.
If the lubrication does not help and vibration continues to be transmitted, the flexible shaft must be replaced.
– 3. Alexander
| Pros: | Low weight.Little fuel consumption.Accessories. |
| Cons: | The clutch design, the longitudinal movement of the outer cup.Loud clacking and clicking. |
| Review: | Drive shaft.It is very thin and flexible.Must be reworked by inserting additional bushings into the cutter bar.Sorry I bought the sf 55, no advice to buy. |
– 2. stroibol
| Pros: | It works for now. |
| Cons: | No hole and screw to lubricate the gearbox, despite the fact that the description is in the instruction since February this “innovation” was introduced. It seems to be done on purpose to reduce the life of the brushcutter. Even the cheapest Chinese mowers have a gear lubrication screw. what is the reason for this innovation. unclear. |
| Review: | Took me a long time to choose the braid. I spent about a year on the reviews, all weighed and evaluated, I decided to pay more to buy a quality product, but as a result I missed. I bought it in March when there was a small discount, but when I got it out of the box, put it together and found out that it was a February novelty. At first I thought I got a fake, but after talking to an official representative of the company it turned out that this is a February innovation of the company. On the forums I got tips. Drill a hole, cut a thread, put a screw in. But did I choose a well-deserved brand for that as it seemed to me. I am very disappointed. Not satisfied with the purchase((( |
– 2. Roman D.
| Pros: | It’s light enough |
| Cons: | Not reliable. Not worth the money. And yes. vibration. |
| Review: | In two years. I’ve taken it to the service three times, and now I’m doing it again. Stalls after warming up. I would not advise to buy it. Neighbor bails out his Chinese. heavy but runs like clockwork and costs three times less. |
Came to the cottage, it’s time to mow. But there’s one thing. vibration. Disassembled a lawn mower completely with the rod. The bolts were all tightened. In the rod there is no bushing on the clutch side or this sleeve failed deep (which can also create vibration) can not say exactly t.к. I didn’t have a flashlight handy when I took the mower apart. Now the most interesting part is the clutch, or rather the outer part that has a longitudinal stroke of about five millimeters, which is the cause of vibration. The bolt shouldn’t press against. but it shouldn’t have too much clearance. At first I thought the bolt was loose, checked it with an Allen key. It’s tight, so the bolt is longer than it needs to be. Well I’m a locksmith. I’ll do it at. Let me outline: the bolt is screwed through the inner quadrilateral where the drive cable is inserted, and the bolt is wider than the hole in the quadrilateral. There is a bolt, then a brass bushing and then a circlip. And to get the bolt in shorter you have to remove the retaining ring, then pull out the sleeve, then pull out the bolt. I did not chop it off with a vibrating gasoline lawnmower. The snap ring is disposable, with no holes for the ring deflector, so I could not pick it up with a thin screwdriver or a thin knife. Т.I don’t have these locking rings at home. and I don’t have any retaining rings at home. I didn’t chop it off. I packed the lawnmower and went to mow on a vibrating gasoline mower.
My assessment: ? I would not recommend the STIHL FS 55 lawnmower
– 1. Rus Ber
| Pros: | Easy. Price. And a very big advantage for the service centers, because every year you there! |
| Cons: | Once a year you will blow out the carburetor. No matter how hard you try, but working 5-6 times a year on 21 hundred. I replace the carburetor consistently every year. |
| Review: | I would not recommend this model to anyone. 5 years of use and now the 5th carburetor. I haven’t encountered these cases with anyone else. I’ll get another mower, but not Shtil |
Lost hope, I choose Japanese or copepe Chinese? Or even buy 100 meters of cable and take an electric from a kilowatt of power. Damn shtihl with its planned obsolescence program, Chinese carburetors, narrowed channels, some primers, clogged flanges, it all worked fine on the old saw. I wish you from the bottom of my heart ruin, insatiable capitalists.
– 1. Sergey Yu.
| Pros: | I bought the gasoline trimmer for grass STIHL FS 55 in the company store, also ran it checked everything ok. |
| Cons: | It won’t start, I am in agony. |
| Testimonial: | I guess I was just unlucky and got a defect. I own STIHL FS 55, more than 5 years, and all this time I’ve been repairing it, I took it to the service, changed the carburetor. one season more or less, and then again I have problems, no start, and so every year. This year, I filled up with gasoline, started up the first time, mowed half of a plot of 4 acres and stalled. No words, dancing with tambourine, I’ll sell it through AVito and forget about it like a bad dream. I bought it to repair or to mow? ? |
– 1. In the situation Leonid
| Pros: | Convenient, you can mow for a long time (I took in place of the electric, which in summer quickly overheats and triggers thermal protection) Quiet enough and works powerful (mowing grass 70 cm in height) |
| Cons: | I would have never bought a machine with this tech for any money. |
| Review: | If you guys had told me that the service is of this quality, I would not have bought this company for any money! Immediately stating that I use the second year of chainsaws the same company and the problems were not. The second phone number listed on the official site, the second was an auto shop by calling the third, I went there, so questions about what company to buy a trimmer was not. I read a lot of positive reviews here and bought it from an authorized dealer. So when the trimmer stopped working, I found that there is no customer service as such, there are licensed receivers same as sellers of equipment. First phone number listed on the official site did not answer, the second was an auto store, getting through to the third, I went. When I came to the handover to the repair shop, I found out that this is most likely due to gasoline, t.к. you should NOT STORAGE petrol longer than 20 days because the octane number will drop to almost nothing! So it must have been the gasoline that caused the carburetor failure. I bought gasoline at Lukoil, I have receipts. Next was even cooler, the decision whether it was a warranty case is taken in the central office on the basis of the description of the receiver. And he can describe it so that it will be a warranty case, and may be so that it will not be a warranty. In short, in my opinion, this is blatant extortion, in the spirit of the Soviet Union. All sources write that the shelf life of gasoline from 3 years, nowhere else I found the insanity of storage in 20 days. By the way the expertise was charged at once 800 In addition it turned out that the seller did not fill out the warranty card. Upon receipt, they looked at the blank ticket and receipt and sales slip and said nothing, and told me half an hour after I left, had to return through traffic, call the salesman and negotiate with him to bring here a filled ticket. In short, I lost half a day and was completely disappointed in the service of this company. Lest anyone think that this is writing competitors (other reviews are so great) My number is 915 349 2199 my name is Leonid can send you photos of the documents and addresses of these technical centers. |
STIHL grass trimmer fs 55 not rpm
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