Causes of power loss in a brushcutter. lawnmower does not develop full power
Anyone who owns a dacha or a plot of land is well aware of the problems of dealing with excessive vegetation. Now the grass trimmer has come to the rescue, 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 pick up speed 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 by type of power: gasoline or electricity (from a network or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many respects. Despite the fact that they all perform similar functions, the difference in performance, maneuverability 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 ICE or electric motors), which drive the cutting unit (spool with a fishing line or metal disc). All the elements are mounted on a straight or curved boom, including the trimmer’s control handle, where the main buttons are located.
Since the problem of weak revolutions is more characteristic of gasoline versions of trimmers, they will receive more attention. So, 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 the elementary things that 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;
- at first, to make light jerks with the starter handle to feel the resistance of the engine, then to yank sharply.
If the lawnmower starts but stops, put the choke shutter 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 works only on the suction.
Important! Grass trimmer performance 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 heavily. Take a five-minute break every 15 to 20 minutes.
Grass trimmer performance
All grass trimmers are classified according to 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. While they all perform similar functions, there are major differences in performance, maneuverability and efficiency. 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 drive the cutting unit (spool with a fishing line or a metal disc). All elements are mounted on a straight or curved boom, including the handle to control the trimmer, where the main buttons are located.
Since the problem of weak revolutions is more characteristic of gasoline versions of trimmers, they will be given more attention. Thus, the lawnmower is very comfortable in operation and unpretentious in service. At the same time, most of its malfunctions are caused by the user’s ignorance of the elementary things written about in the manual. Therefore, before you start operating 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 the silicon button several times to pump up the gasoline;
- close the air damper;
- Set the throttle lever in the position for high revolutions;
- Start with a light jerk of the starter grip to feel the engine resistance, then yank sharply.
If the lawn trimmer started, but stalled, you need to put the air damper in the middle position and try again. When the engine starts, you need to turn off the gas and open the air damper, because the grass trimmer works only on the suction.
Important! The operation of the grass trimmer depends on various environmental influences. In hot weather you must give the unit more time to cool down. When working in dense thickets or high vegetation, the engine also overheats heavily. It is necessary to make five minute breaks every 15-20 minutes.
Diagnosing and Troubleshooting Power Tools
Malfunctions of electric trimmers can be as follows:
To cope with these failures, you do not need to disassemble the entire machine.
To recap! Before you start the repair, it is important to prepare the necessary tools: a set of screwdrivers, a tester, a soldering iron, an indicator, a set of keys.
If you have a serious problem with the engine, you have to disassemble it. To do this, unscrew a few screws. Once you have access to the motor parts, you need to carry out the following actions:
- Check the degree of wear of the brushes. unusable parts will need to be replaced with new ones;
- test the motor winding. the resistance should be high;
- Check the stator and rotor. to test the rotor winding with a multimeter, measure the resistance: large deviations from the norm indicate malfunction, the lack of resistance on the stator winding also indicates a breakdown (in the same way the stator housing is diagnosed).
Tip! The solution to problems associated with faulty electrical components, involve great difficulty. It is often easier to replace them with new parts than to take the time to rewind them.
Problems with low revolutions are common for cheap trimmers. However, if improperly maintained, it also suffers from such manual mowers, such as Huter, Patriot 3055, Echo.
The lawn mower stalls at high engine speeds
during operation, there is a situation when, when pressing the fuel mixture supply key, the unit RPM starts decreasing, not increasing. Failure of this nature can be caused:
Fuel hoses of a brushcutter with filter
- by etching atmospheric air into the combustion chamber;
- Problems with fuel mixture circulation;
- the breather plug in the fuel tank lid is clogged (clean the hole with a thin sewing needle);
- improper carburetor adjustment.
If there is air leakage during the operation of the engine, you need to check the tightness of the connection pipes and the integrity of the gaskets in the cylinder head. Fuel mixture circulation problem may be corrected by troubleshooting clogged fuel lines to the carburetor. If there is a vacuum in the tank and the fuel mixture does not come to the carburetor, it is enough to clean the breather plug with a fine needle and blow it with air.
Lawn mower does not pick up speed
The cause may be such malfunctions:
- The muffler needs to be inspected. it may be clogged;
- Grass wrapped around the shaft and it makes the blade not twist as shown in the photo;
- Rust on mechanism and parts;
If the mower is not running at full capacity, the mechanism must be disassembled and cleaned.
At high speeds
When the braid lingers at high speed, it is due to the following problems:
- The valve located on the gas tank lid is clogged or stuck;
- The carburetor is not aligned due to vibrations that occur during operation of the mechanism;
- Problems with fuel mixture circulation;
- Air flow;
- The fuel injection hose is cracked or loose.
Carburetor settings, Based on the grass trimmer instruction manual. To adjust, it is often enough to loosen the body’s tension. If there are problems with circulation of fuel mixture, it can gradually get into the carburetor. After its development, the engine stops at high speed.
Modernization does not stand still. And the old chainsaws, which in addition to being able to chop firewood, causing a terrible roar and vibration, can be heard for almost miles, long ago. Almost silent, carefully designed tools, which were now pleasant to hold, flooded the market, giving users a feeling of complete happiness and technical freedom.
But unfortunately, no matter how technically and visually modern technology gets around, its failure is a fairly common occurrence that manufacturers only talk about “defaulting”. Chainsaws are no exception to this, multifunctional work units that require a great deal of attention from the user in order to recognize a “catch” in time and stop a problem in its earliest stages.
The main of these nuances usually relate to the moment of start-up, which should be taken responsibly. Let’s look at the basic processes that can occur with a chainsaw when starting the engine.
The knives are not adjusted correctly
This can be noticed by the uneven surface of the lawn. Before making any adjustments, you must unplug the mower and wear protective gloves.
The gap between the cylinder and the blades should be uniform at all areas and not exceed the thickness of a sheet of office paper. Even the same paper is used to adjust the gaps. It is inserted between the cylinder and the knife, and then the drum rotates. It is necessary to adjust the knives until the paper is evenly cut at any point of the knife.