Vibration during operation of the grass trimmer

Electric grass trimmer or lawn mower has a limited life-span, just like any electric tool. As the intensity of operation increases for various reasons, the unit’s service life decreases.

It is necessary to be ready that at any moment during the work, the electric grasshopper may break, but such situations can be avoided if all important elements of the grasshopper are regularly dismantled and inspected.

Troubleshooting can be very diverse, it can be a breakdown on the electrical part of the engine and wiring, and on the mechanical part.

In most cases, to make repairs trimmer for grass or a scythe for the grass is not difficult and can do it on their own in the case when there is a minimum tool and the basic concepts of technology. And for the readers of the site elektt.blogspot.I will reveal the main faults and secrets for fast and reliable repair of your Bosch electric lawnmower, and consider example of Bosch and Gardener electric lawnmower repair.

The design of most electric scythes is not a complicated device, the basic components, whether it be a trimmer for grass or grass braids, there is an electric motor, power cord, button with capacitor, spool with fishing line which is mounted on the motor shaft or more complex mechanical versions of braids where the torque from the motor is transferred to the spool through a flexible shaft, but among the electric versions of braids this option is rare.

You bought yourself a new gasoline trimmer for the grass and it immediately became difficult. Very rough starting. If you mow for a while and then turn it off, it’s even harder to start while it’s hot than when it’s cold. What to do with it, I don’t know how to start it correctly?

The instructions for starting the brushcutter are as follows:

Pump up the fuel with the silicone button (primer) on the bottom of the carburetor. You have to do as much (or a little more) than it is written in the manual, usually about 8-10.

Fix the throttle lever with the stop button at high revs.

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Pull the starter handle 2-3 times. The engine should “grab”.

If the engine “grabbed” and stalled, then you need to move the air damper to a 1/2 position and try to start again. If the engine has started, we dump the gas and move the choke to the “open” position. Getting Started.

No need to worry about overfilling during pumping operations. If this happens, and, as they say, “poured the plug”, it is not necessary to unscrew it, it is enough to put the air damper in the “open” position and, holding full throttle, simultaneously scroll the engine with the starter 2-4 times. After that you can start the engine and get to work.

Possible problems with the grass trimmer gearbox, lawnmower gearbox, brushcutter gearbox

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Plastic parts wear and tear

As the electric trimmer is used, some of its parts are subject to wear and tear. This applies mainly to the working head. The battery is damaged, and the lower part of it rubs heavily during operation on the work surface, which can contain stones, wood, glass, and other hard debris. All this wear and tear inevitably results in great wear and tear and must be replaced as a matter of urgency.

vibration, operation, grass, trimmer, start

The lines with rhombic, triangular or square cross-sections cut the grass best. These are the types most often used in practice. If possible, it is better to refuse from lines with a circular cross section.

Also be sure to pay attention to the line’s elasticity. It must not be too soft. For this reason, you should not buy a line for your trimmer that is prepackaged.

Gearbox construction

In order to better understand what lubrication is needed for your trimmer for grass, it is necessary to understand how the gearbox is arranged, which nodes it consists of and analyze the working conditions of these nodes.

The grass trimmer gearbox is usually located at the lower end of the drive shaft and serves two main purposes:

  • The rotary motion of the shaft should be transmitted to the line reel or cutter
  • Increasing the trimmer’s torque by reducing the number of revolutions

A gearbox usually consists of the housing itself, shafts, several bearings, one or more spur and bevel gears, seals (see photo). photo).

The drive shaft turns the drive shaft together with the drive pinion at high speed. The driven gear has a greater number of teeth and therefore the driven shaft rotates more slowly. But the torque on it increases. Each shaft is mounted in the housing on two bearings.

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Grass trimmer vibrations and shocks caused by changing rotation resistance caused by cutting unit interaction with grass, bushes. Clippings on blades of grass or dirt also contribute to dynamic vibrations and oscillations if they are rotated at high and constantly changing speeds.

In general we can say that gearbox units operate at high rotation speed and dynamic loads. High contact stresses are placed on pinion teeth, bearings are subject to transverse vibrations.

vibration, operation, grass, trimmer, start

Temperature conditions are medium, since the tool is designed to mow grass, and this work is usually done in summer, at positive temperatures. Friction causes heat to build up in the gearbox, but the excess heat is dissipated by lubrication and atmospheric air cooling of the gearbox housing.

Strong heat is unusual for a gearbox and indicates the need for repair or lubrication.

Electric grass trimmer vibrates

Many mower users have noticed that the machine starts to vibrate badly after a while. Some trimmers, mostly more expensive models, have an anti-vibration system in the form of shock absorbers between the engine and the boom. But in some cases even it does not save from strong vibrations. The reason of strong vibrations in the trimmer may be due to little or no lubrication on the hard or flexible shaft inside the machine’s boom.

Changing the lubrication of the hard shaft is as follows:

  • Apply a small amount of grease on the shaft and spread it evenly over the entire length of the part, including the splines on the ends of the rod (if they worked off, the shaft will have to be replaced);
  • after greasing, insert the shaft back into the rod and put the gearbox back in its original place.

Lubricate the flexible shaft as follows:

  • Unscrew and remove the mowing head;
  • Remove the shaft from the motor by loosening a couple of screws;
  • pull the flex cable out of the boom;
  • Lubricate and grease the whole length of the cable.

To do this: first grease the end of the cable, and then insert it into the rod, and then, as you move it inside the tube, apply the grease to the part and distribute it evenly over the surface. Then insert the rod with the flexible shaft into the electric motor and secure it.

If lubrication has not helped and vibration continues to occur, you will need to change the flexible shaft.

When the throttle is pressed

If the mower stops when you press the throttle, the reasons may be as follows.

  • The most common variant is carburetor adjustment failure, which occurs when the drive is heavily loaded, after prolonged inactivity of the mechanism or when it is used in harsh conditions.
  • Fuel valve becomes clogged and can be repaired by loosening it, resulting in normal fuel flow.
  • Loose and hanging cable in the carburetor. The fuel hose can also stretch to the point of bursting under considerable strain.
  • The breather valve is blocked and does not let fuel into the tank.
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If the problem is related to the carburetor unit, you can recognize it by the appearance of lawnmower vibrations. When the hose is broken or the cable is stretched, these components should be replaced.

Care of lawn mower cutting units

Dull or worn saw headsets over time. Working with tools becomes more strenuous, loads are increased, quality of mowing is impaired. Sharpen metal blades and change plastic blades.

If the cutting tool is a line for the trimmer, it gradually wears out, and a new material is installed in the spool. The principle of the line cutter is to gradually unwind the spool by the centrifugal force. When in contact with the grass, the trimmer line rubs off, from the spool it feeds gradually. A special winding is necessary so that the two cutting elements come out simultaneously and do not get tangled up with each other.

The illustration shows how to wind the trimmer line correctly on the reel of the lawnmower. Before winding new fishing line for the trimmer it is necessary to:

  • Having unscrewed the nozzle, carefully remove the cover, holding the spring with your hand;
  • Remove old line scraps from the spool;
  • measure 5 meters of new string and fold it in half;
  • in a spool guides under 2 ends, to catch the middle part behind a notch and to wind up in the direction of arrows for each half of a string;
  • to guide the remaining 20 cm through the notches at the opposite ends of the spool;
  • install the spring and washers, bring the ends of the line outside, close the drum with the lid.

To get a better understanding of how to change a trimmer line on a chain saw, watch this video.

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