Grass trimmer malfunctions at high engine speeds cause

Grass trimmer malfunctions

Lawn trimmer is a convenient and affordable replacement for a lawn mower. Its cutting part is made in the form of a fishing line, knives or disc mounted on a drum, which is covered by a protective cover from above. It is based on a boom that is height-adjustable, has a comfortable handle and a shoulder strap at the end.

Like any other technique, the trimmer for grass can break down unplanned, and in order that the breakdown did not lead to the final failure of the tool, we suggest you read this article. The unit can break down for a variety of reasons. Breakdowns occur both at new trimmers, and at those that have long been in use.

Failure of electric models

Causes of sudden disconnection of the electric lawnmower are due to a broken cord or a lack of current. In the first case, it is recommended to check the cable for breaks. To replace the power cord, you will need to pull the plug out of the socket, open and remove the switch cover.

Before unscrewing the cable clamp? You need to remember the diagram of its connection to the switch. To loosen the cord, use a hexagon socket (1 mm diameter). The clamp is released, the conductors are removed. A multimeter is used to check the cable for breaks. If necessary, a new cord is installed. In this case, follow the reverse sequence.

In the second case, it is recommended to connect another device to the mains. Electrical units may not work if the fuse in the plug is damaged. To carry out repair work, it is necessary to disassemble the plug. A screwdriver and a tester are used for this.

Motor malfunctions occur when the lawnmower overheats:

In the first case, it is advisable to wait a few minutes for the motor to cool down. In the second case, it will be necessary to remove the jammed object. The efficiency of the cooling system depends on the condition of the air filter.

Dirty device bad air flow, which contributes to the shutdown of the machine. Experts advise cleaning and changing the filter once every 3 months (if the lawnmower is constantly used).

If the electric motor breaks down, there is a corresponding smell and noise. In this case the actuator needs to be replaced.

Engine vibration at idle, on cold or warm engine: possible causes

We shall mention at once that there are many reasons for the appearance of engine vibration, starting with torn pads (supports) of the engine and finishing with ignition skipping and touching the engine. For a more precise determination, you should first pay attention to one or the other symptoms.

The case is that the vibration may be constant (regardless of warm-up and loads on the unit), and appear in a certain mode of operation (idle or high RPM, when cold or hot). Another engine vibration may occur when the engine is cold, but as it warms up, it completely disappears. Let’s get to the bottom of it.

• For example, if the engine has been recently disassembled for repair (possibly overhaul), then it is highly probable that after reassembly the crankshaft was not properly balanced. The result is runout and increased vibration.
• Also note that after the repair of the engine, imbalances and vibrations may be caused by the different weight, which have details of the cylinder-piston group. The greater the difference in weight, the greater will be the vibration. For this reason, experienced craftsmen before assembly weigh the pistons, pins, etc.д.
• the vibrations are often caused by the engine tripping, which means that one or several cylinders either do not work or work irregularly for some reason. As a rule, eliminating the cause of the TNT automatically eliminates the presence of powertrain vibration.
• It is also worth mentioning that a timing belt or chain aligned incorrectly can also cause vibration.Reason. the engine is unstable due to a disturbance in the timing of the timing.
• Many engines have special balancer shafts in their design, which are needed to “dampen” the vibrations. Obviously, problems with said shafts will lead to increased engine vibration.

Engine pads are one of the most common causes of engine vibration. In fact, it is a damper, made of rubber on many cars to absorb vibrations. As you know, over time, rubber dries out and cracks, loses its properties as a result of technical fluids, etc.д. The main thing is that an engine with a damaged cushion can not run smoothly.

• If you have recently switched from one vehicle to another, you should be aware that different engines may differ in terms of vibration load. The number of cylinders, layout, and a number of other features affect vibration levels. In simple words, a typical inline 6-cylinder engine may run with less vibration than a 4-cylinder and, even more so, a 3-cylinder motor. In this case we are not talking about malfunctions, since for a particular ICE a certain level of vibration can be considered the norm.
• Also add, to reduce vibration, on the crankshaft of many engines is the so-called torsional vibration damper. If there is a problem with the element, the engine will vibrate more strongly.

As you can see, at the initial stage it is important to accurately determine the cause of vibration amplification. For example, in most cases, replacing the engine mount or solving the problem that causes the engine to trip. But it also happens that the powerhead itself needs to be disassembled and repaired.

Repair of mechanical mowers is carried out in case of bluntness or damage of cutting elements. In such a case, experts recommend dismantling the detachable blades themselves. An emery is used to sharpen them. If necessary, the battery of battery-powered models is replaced.

Before repairing the lawnmower, the type of motor is determined:

At idle speed

At idle speeds, common causes of grass trimmer stoppage are the following:

• Reduction in gearbox rpm when warmed up due to the use of an unsuitable fuel mixture;
• clogging of the throttle valve;

Trimmer won’t stay running, fixed.

• air ingress into the system;
• Not enough fuel to run the lawnmower.

If the problem area is the carburetor, then the equipment will stop both at “cold” and “hot” starts.

Adjusting the carburetor when the engine stalls at revs

If the check shows that the fuel system, muffler and spark plug are good, it is necessary to find the failure in other places. First, do not rush to disassemble the piston-cylinder group or change the carburetor. Repair is recommended to begin with the adjustment of the carburetor. For this purpose, all chainsaws have special adjusting screws. They are created for the option of idling, and adjusting the fuel supply at low and high revolutions. A detailed description of how to adjust the carburetor of a chainsaw, described on the website.

Now let’s consider the peculiarities of the carburetor at high rpm. To make sure that the chainsaw does not develop full power, you can use the tachometer. If there is no device, then you can verify that the engine does not develop the greatest speed by ear. We are interested in the screw on the carburetor. Which is designed for the option of high revolutions. It’s usually identified by the Latin letter H, which is short for High.

For the option of a large revolutions of the chainsaw comes in handy to perform the following manipulations:

• Turn the screw H clockwise as far as it will go
• Next, you need to loosen it by 1.25-1.5 turns
• Start the tool and test the revolutions to see if they work

It is recommended to make adjustments on the tachometer, but if it is not available, you can check the highest revolutions by running the inventory under load.

After the obvious option of the carburetor, you can correct the problem with the motor stopping at higher revolutions. It should be noted that it is necessary to adjust the carburetor of the chainsaw often depending on the frequency of operation of the tool. It is not difficult to do without help of others, but you can reach a clear option in one case if you use a tachometer.

Overview of gasoline grass trimmers Husqvarna

I chose this model because I have heard many good reviews about the Husqvarna brand. I myself have a chainsaw Husqvarna 142. very satisfied. I selected the Husqvarna 128R as the most popular on the Yandex-Market. Bought in early May 2010. I’ve had the pleasure of using. Then I went on vacation in the middle of August. After a month and a half, it wouldn’t start. I did not bother with it. At night it was about 0 degrees. I decided that next spring, everything will work itself. And here is the middle of June 2011, and I have a lawn grass above the belt on the site in general overflows gasoline. all the time wet candle. Took from dacha to Moscow. The official service at the company store in Khimki is closed for reconstruction. Turned to the off. service at the st. After visiting this service I had no desire to leave my grass trimmer for repair there. it is situated in the store’s outbuilding. Didn’t take much trouble. didn’t adjust carburetor in front of me. A lot of broken equipment. The queue will not arrive earlier than 10 days. quoted. for the adjustment. 1000 for a new carburetor (just buy it from them and put yourself). 2600 But they insist that you may need to replace the piston 6000. 7000 Parts for the carburetor does not sell. Took it apart at home. The carburetor ZAMA model C1Q-W41. By the nature of the problem (gasoline even at idle engine, leaking through the carburetor and then through the air filter) most likely a problem with the needle valve. CAN’T BUY PARTS ANYWHERE. Only carburetor assembly (3000 ). Disassembled the carburetor, cleaned everything with a special carburetor spray. Reassembled it and same thing Checked a lot of sites on the internet. The most information about this carburetor type (VALBRO) is on the Paraglider forum. The guys there clearly understand the needle valves and springs (the stiffness of the spring depends on the filling of the carburetor chamber gasoline) stretch the spring a little, assembled and “Oh miracle. “after a little adjustment, it worked like clockwork for half an hour. Two weeks later, went to the cottage and Same again carburetor overflow. Starts when the choke is closed and then shuts down. It turns out without a new carburetor needle and spring (on the car such parts are less than 50 ) my grasshopper. scrap metal. As a result, I ordered the repair kit Zama RB-47 carburetor kit carburetor ZAMA at auction “ebay.com” is nowhere to buy. Marasmus. The services don’t sell any, the markets don’t. The dispatcher on the Husqvarna support line can only give information duplicating that found on the website, i.e.е. I don’t understand why I can’t get the carburetor working properly, and the grass isn’t getting mowed,” I got the wrong idea!

Adjusting and tuning the carburetor

Maximum and minimum engine revolutions, even idle speed are adjusted by the carburetor. On the amount of fuel mixture and air fed, their ratio depends on the stable operation of the lawnmower. lawn mower does not start if carburetor is out of adjustment. The adjustment procedure for the low speed (L), high speed (H) and idle speed (T) fuel supply is adjusted with the same-name screws:

• The chainsaw should run for at least 10 minutes, as the adjustment is made by the hot.
• Turn the H screw smoothly to maximum rpm, then turn it ¼, counterclockwise, reducing the speed of the motor shaft.
• Regulate the idle speed with the screw T so that the grasshopper does not rotate.
• Screw L is adjusted, first opening the throttle as much as possible, and then gradually reducing the speed to a stable minimum.

After adjustment, an operating carburetor with cleaned filters and checked ignition should allow the engine to run. If the carburetor is faulty, after repairing it, the feed system will need to be adjusted again before the lawnmower can be started.

Rare breakdowns that prevent the lawn mower from working may be:

If your grass trimmer won’t start even after such mockery, you can’t do without disassembling the carburetor. It is very possible that the needle in the needle may be at fault. The mower stalls at idle speed. When it heats up, the weed trimmer immediately shuts down why it shuts down? Why the hot one is stalling ? In fact, if the hot is not 15 what trimmer for grass to take? Hitachi. In any case, disassembly and flushing of this capricious mechanism certainly does not hurt.

In general, when the grass trimmer began to be capricious and sizzle, it is advisable to conduct a complete prevention: completely change the fuel mixture, try a different oil, as well as mandatorily change the candle. Practice shows that in many cases it is cheap low-quality spark plugs that are to blame.

We have considered the most common reasons why the grass trimmer won’t start. If the matter is more “exotic”, it can’t avoid a trip to the service center. Smaller and more obvious breakdowns you can probably find by yourself.

At idle speed

At idle speeds, common causes of a grass trimmer stopping are the following:

• Reduction of gearbox rpm when it gets hot, which is a consequence of using unsuitable fuel mixture;
• Throttle blockage;

If the problematic place is the carburetor, then the technique will stop both at “cold” and “hot” start.

How to start diagnosing your brushcutter?

If the lawnmower won’t start or immediately stops after starting, you need to check all the major components one by one. The check algorithm is as follows:

• Fuel tank (fuel quality);
• The spark plug and spark plug passage;
• Air filter;
• Fuel filter;
• Breather;
• Exhaust port.

These components are most often the source of major problems, which can be corrected after a thorough inspection.

Checking the Fuel Mixture

Before starting the engine of the gasoline grasshopper, check the presence, and quality of the fuel mixture. Do not save, do not be greedy and “do not be smart” in this matter. The best lightweight gasoline trimmer for grass

Repair or replacement of the piston group will cost you too much (sometimes up to 70% of the cost of a new tool). Prepare oil-fuel mixture strictly according to instructions. Calculate its quantity from real needs. Excessive petrol left over from working loses its properties over time.

Carry out a diagnosis of the spark plug and spark plug conduit

If the quality of the fuel mixture is not in doubt, but the lawnmower does not start, it could be due to a clogged spark plug. An ordinary spark plug wrench (every motorist is sure to have one) and a spare spark plug will do the job.

• Unscrew the plug and wipe it;
• Dry it thoroughly (don’t burn it);
• Excess fuel in the chamber drain through the spark plug hole and dry it;
• Clean old candle from soot with a file or a nail file;
• We set the gap with a distance of 1 mm (you can check it with any coin);
• Put everything back and try to start the weed trimmer.

Dry the channel for at least 30-40 minutes. Otherwise, there’s a risk of re-flooding and a new spark plug.

If the spark plug working, the socket where it is located completely dry, and the lawnmower does not want to start, lubricate the threaded connection with gasoline. It should be slightly moistened. No matter how good the spark is, there is nothing to light in the dry chamber.

If the grass trimmer engine still does not start, you should rule out such a cause as a lack of spark due to poor contact between the spark plugs and the high-voltage wire. Lawn mower grass trimmer review comparison. If the connection is good, but still no spark, you most likely have a “broken” ignition unit. You can’t do without a handyman here, t. к. The part is not repairable, but is sold as a complete unit.

BRIGGS STRATTON Lawn Mower Repair

If the engine doesn’t run clear and starts

It doesn’t always go off under load. it’s time to take it apart.

BRIGGS STRATTON PROBLEMS. Lawnmower.

,Stalling. Peef-pah-pah, Gasoline drips from the carburetor and other lawn mower malfunctions

Diagnosis of lawn mower filters

Another reason for a gasoline grass trimmer to stall may be the air filter. To rule it out, try to remove the filter and start the grass trimmer without it. If it works, you will have to replace the air filter with a new one, or at least blow out and thoroughly clean the old one.

The gasoline grass trimmer may not start due to a dirty fuel filter. This is the next step of our algorithm. Here we check the condition of the filter element and, if necessary, replace it with a new one. When replacing the filter, try not to leave the intake without the filter at all, this is forbidden by any instruction manual. Grass trimmer gasoline grass trimmer

STIHL. Hurrying may result in the engine’s piston assembly being repaired.

Breather and exhaust duct

Often, “delicate” brand name models do not start and shut down due to a clogged breather. The main function of this element is to equalize pressure in the gas tank. When this node is clogged, a vacuum is created in the tank, preventing the flow of fuel. The problem can be solved by cleaning the breather valve. The grass trimmer Huter does not start. An ordinary needle can be used for cleaning.

Normal operation of a brushcutter with a combustion engine can be impaired by dirt in the exhaust air duct or a clogged muffler screen. STIHL gasoline grass trimmer does not start. There is such a problem on older models. The problem can be solved by traditional cleaning and removal of the anti-sparking grid.

Causes of power loss in a brushcutter. Lawn mower does not operate at full power

Anyone who owns a garden or a plot of land, is well aware of the problems of combating excessive vegetation. Now a grass trimmer has come to the rescue, which has successfully replaced the conventional scythe in this field. This unit is very convenient in operation, but it, as well as any mechanism, because of the harsh working conditions or incorrect operation it is inherent to fail. It is quite common when the grass trimmer does not pick up speed. In order to understand this problem, it is necessary to understand some aspects of the machine’s operation.

grass trimmers are reliable and durable (assuming proper care, of course). The most frequent malfunctions occur due to contamination of structural elements.

If the engine of your lawnmower does not start, does not pick up speed, does not reach the power you need or suddenly stops, the reason may be:

• low-quality fuel (fuel mixture), the case may be in long-term storage or failure to comply with the formulation of the mixture;
• Grass has wrapped around the line/knife head shaft;
• clogging of the air filter/muffler;
• carburetor out of balance.