Where the grass trimmer is filled with oil

Trimmer care

The durability of any commercially available brushcutter is directly affected by proper operation and maintenance of the garden tool. The life of the lawnmower depends on it, as well as its efficiency and speed of work on the site. There is a list of rules and recommendations, adhering to which the owner of the grass trimmer will be able to protect the tool from premature breakdowns. Their study and compliance will be useful not only for beginners, but also for experienced gardeners.

Before you start the brushcutter, you need to prepare the fuel mixture and pour it into the plastic tank of the tool. Not only the quality of gasoline and oil for 2-stroke engines plays an important role, but also their ratio in the mixture.

This Is What Happens To 2-Stroke Engines Without Oil (2-Cycle Engine No Oil Experiment)

Each manufacturer specifies in the instruction manual the proportion that will be optimal for the respective model. The operator is required to comply with this ratio every time, because otherwise the motor of the garden tool will fail quite quickly.

Some brands recommend preparing a fuel mixture in the ratio of 1:25. In practice, this means that in 1 liter of gasoline you need to dilute the engine oil for the lawnmower in the amount of 40 ml per 1 liter of gasoline. If the manual says that the proportion should be prepared in the ratio of 1:50, it means that the oil for gasoline trimmers should be diluted in gasoline in the amount of 20 ml per 1 liter of fuel.

It is very important to choose the right fuel and engine oil for your grass trimmer. It is strictly forbidden to use automotive oils, because they contain additives that can harm the engine of the brushcutter. Best oils for 2-stroke engines from well-known brands: STIHL, Husqvarna or Makita.

Buy gasoline for your trimmer only at gas stations of proven brands. Fuels best suited for brushcutter use are AI-92. It differs from the 95-th gasoline in that it does not contain extra impurities, which are used to increase the octane number of fuel.

Fuel mix for two-stroke engines

trimmers for grass, which are equipped with a two-stroke motor, do not have a separate system designed for the supply of oil for the lubrication of moving parts. For this reason it is necessary to fill such devices not with pure gasoline, but with mixture of fuel and engine oil. The latter must be specially formulated for two-stroke engines. Using automobile engine fluid will cause premature engine failure.

Preparation of fuel mixture for two-roller engines

grass, trimmer, filled

Gasoline for a lawnmower with a two-stroke engine is AI-92. When using AI-95, overheating of the engine and uneven running of the unit may be observed. Gasoline should be mixed with oil in a 50:1 ratio, where 50 is fuel and 1 is oil. It turns out that you need 20 ml of oil per 1 liter of fuel.

If the engine is worn out or the tool works with a high load, the proportion is 25:1. If there is not enough lubrication, the cylinder walls and piston surface will get scuffed. The piston ring will then deteriorate, causing the engine to seize. Over-exposure is not critical, but it can lead to fouling. Piston ring in this case corks, which reduces the capacity of the device.

Proportion of oil and gasoline for the fuel-air mix

How lubrication systems work

Both types of engine contain a fair amount of moving parts. Lubrication is required to extend their service life. Feeding it to two-stroke and four-stroke engines is done differently and this kind of nuances have a direct bearing on the fueling and service order.

Lubricant delivery in the two-stroke engine is carried out together with the fuel-air mixture. Oil dissolved in fuel is atomized together with the gasoline in the carburetor, and the resulting mist enters the crank chamber. The channels are configured in such a way that the path of atomized lubricant is as long as possible and goes through the main moving parts. due to the special properties of the oil, most of it settles on the metal parts, and the cleaned fuel is transferred to the working area of the cylinder. These are the properties that make two-stroke oil fundamentally different from other engine types.

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In a four-stroke engine, the oil in the insulated crankcase is constantly. Its level is controlled so that the crankshaft journals are periodically dipped in the oil bath. When the lug rotates, centrifugal force causes it to spray oil inside the cylinder, so that the oil gets into the piston and piston pin and onto the walls, which cools it down. To prevent oil from flowing into the combustion chamber, the piston has an additional crimp ring that removes residual oil from the cylinder walls as the connecting rod moves down.

Order of use and function of oil in a 2-stroke engine

To operate a 2-stroke petrol engine, first of all the fuel-oil mixture must be prepared. It is a gasoline (usually manufacturers recommend to use gasoline A-92) with a certain ratio of special oil added. To know the exact proportions, look at the equipment manufacturer’s instructions.

OIL manufacturers also often state the proportions in which oil should be added to gasoline.

In conjunction with the fuel in the engine cylinder, it lubricates friction parts and is burned during the operating cycle. Exhaust gases and combustion products are released into the atmosphere.

Two-stroke engine oil has more than just a lubricating function. It is supposed to protect parts from corrosion, piston scuffing, and soiling of the spark plug, and performs a detergent function.

One of the principal requirements of the fuel-oil mixture is that it burns completely in the cylinder.

If the oil is added in too much quantity, the combustion is not complete and this leads to soot formation and harmful exhaust fumes. If, on the contrary, the mixture is too weak, it cannot fully carry out the lubrication and protection of the engine. This will adversely affect the service life of the grass trimmer.

To dilute and store the fuel mixture it is advisable to use metal containers, glassware or special containers for fuels and lubricants. Plastics and polyethylene partially degrade in gasoline and reduce the quality of the fuel.

For work it is recommended to use freshly prepared mixture.

Varieties of material

Oil. the name is rather conventional. It is an oil base with a variety of additives. Without it, its lubricating power is not very great.

grass, trimmer, filled

The base is divided into two types according to its origin:

  • mineral. obtained by refining of oil. Its properties depend noticeably on the composition of feedstock and are not stable, that is why a lot of different additives are added to the mixture. Despite their action, it is recommended to replace the mineral material as often as possible;
  • synthetic. produced by directed synthesis. Properties of the mixture are predetermined, they are characterized by stability. Synthetics last longer and need to be replaced less often.

Additives added to the bases impart different additional properties to the blend:

  • antioxidants. extend the “life” of the mixture itself
  • Corrosion inhibitors. protect the engine from rusting;
  • anti-wear. reducing the wear of parts;
  • thorn modifiers, etc.

In order to obtain the same properties different additives are added to synthetic and mineral bases and in different percentages. That is why the compounds must not be mixed under any circumstances.

Lawnmower maintenance

Here you will find information on how to properly care for all parts of the equipment, how to adjust, how to disassemble and what and how to lubricate the mower (moving parts).

Engine. Keep the air filter clean, and keep foam rubber parts moistened with oil. The fuel filter should be checked at least once a week, and in case of malfunction it should be replaced in time. Muffler and plugs must be cleaned regularly to remove carbon deposits (as dirty). Check that all nuts and bolts are properly tightened before each use.

The bevel gear should be cleaned of dust and dirt as needed, as this prevents effective cooling, and then lubricated with any gear lubricant such as STIHL.

Trimmer head with fishing line. The brushcutter head must be cleaned after every use and replaced if it is cracked or deformed. Use only wire or cord specially designed for trimmers! The diameter of the line must be as stated on the particular model. The filament must be wound tightly but without crossing each other’s threads.

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Cutting equipment (saw blade or knife). Sharpen metal parts at a specific angle (special files and templates are available for this purpose). Double-sided models should preferably be turned over from time to time for even wear. Dull or improperly sharpened discs and blades cause overloading of the engine and shorten the service life.

Protective guards should always be on when mowing. They shelter the operator from flying grass and stones from under the cutting attachment and reduce stress on the engine. After use, carefully clean the inside and outside of the blade guard with a jet of water or soft cloth, taking care not to scratch the surface.

Tools and supplies needed

You will need the following tools and materials to maintain the gearbox:

Hex key for opening the lubrication hole in the Geareducer

This tool is usually supplied with your brushcutter or trimmer.

Next tool is a standard 10 ml medical syringe. That’s how you get the grease into the gearbox.

It is advisable to use a lubricant that is specified by the brushcutter manufacturer. As a last resort, you can use any type of rotary gear lubricant, such as Lithol 24.

Action Open the gearbox

Open the Geareducer to gain access to the gearbox. It is easy enough to do. unscrew the gearbox bolt with a hexagon wrench. This bolt for all brushcutters is in the same place. right next to the implement.

Action Filling the syringe with oil

Diameter of grease tube does not match the diameter of the gearbox

Use a grease gun to easily add grease to the gearbox.

Then fill the syringe with grease from the tube.

Then the piston is reinserted into the syringe. The grease gun is ready to add grease to the gearbox.

Procedure Filling the Gearbox with Grease

Put the syringe into the Geareducer opening

First of all, put the syringe into the reducer bore.

Squeezing some grease into the gearbox and turning it about a quarter turn

Then press a little grease into the gearbox and turn it about a quarter of a turn.

When all the grease has been squeezed out, the process is complete

Provide grease in small portions. After each application of lubricant turn gearbox by 1/3. 1/4 turn. It is desirable to choose the amount of grease for each filling so that the gearbox makes a full revolution during the lubrication.

Action Gear Sealing

Once the gearbox has been filled with grease, tighten the bolt on the gearbox and clamp it well.

How to lubricate the gearbox of a brushcutter (the easiest way)

How to lubricate the gearbox of a grass trimmer or brushcutter: Proper care for your garden tools | (Photos Videos)

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Motor oil for grass trimmer. what is it, purpose, requirements

The mechanical components of the brushcutter engine are subject to permanent frictional forces. As a result, premature wear and tear and subsequent repairs are inevitable. The only way to eliminate the cause. is to apply a special lubricant. For gasoline engines with ICE-type engines, a special oil is used for this purpose.

It contains a mixture of hydrocarbons and special additives to improve performance. The type of lubricant used as well as the way of filling depends largely on the type of engine itself. 2 or 4 stroke engine. Thus, the oil with the designation “2T” is designed to fill by a small mixture directly into the gasoline grass trimmer with a 2-stroke engine, while its counterpart “4T” is filled into the lawnmower with a 4-stroke engine, but not in the fuel, but in a special compartment. the sump (although there are exceptions, such as STIHL 4-MIX).

Using the right lubricant in gasoline trimmer engines has the following number of positive effects:

  • Reduces friction between interacting cylinder parts, thereby reducing heating.
  • Prevents corrosion processes from developing during extended periods of inactivity.
  • Effective removal of particles formed by contact of moving parts from the working area.
  • Substantial extension of service life and trouble-free operation period.

Not all oils, however, are suitable for this type of equipment. In addition to the fact that it must have a special marking. “for garden equipment”. it must also meet a number of requirements:

  • Increase the wear resistance of the main components of the interacting parts, including in the gearbox.
  • Promote minimum smoke formation in the exhaust gases.
  • Eliminate the effect of early ignition.
  • Mixes well when mixed with fuel. even at minimal ambient temperatures.
  • Have the appropriate viscosity and flow properties according to standards.
  • Have minimal toxicity.
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Please note! Some useful properties (frost resistance, wear resistance, corrosion resistance) of a particular product are provided by special additives. They vary from 5 to 15%. However, using a product that includes additives not recommended by the manufacturer or their increased. May cause fouling or coking of the cylinders and engine damage.

How to lubricate the gear reducer of grass trimmer?

All these nuances and peculiarities of maintenance and lubrication of the device have already been taken into account by the manufacturer. The service instructions give recommendations as to which material may be used for maintenance. Most often there is not indicated a specific brand of lubricant, but those generally accepted standards to which it must comply.

If there is no possibility to buy the grease recommended by the manufacturer, or it is not specified in the instructions, the choice of the lubricant is made by yourself.

It is essential that the lubricant takes all of the factors listed above into account. temperature conditions, high rotation speeds, dynamic loads and vibrations.

An important requirement for the lubricant is also its ability to remain in the friction zone, not to be dislodged by centrifugal forces during rotation and not to be squeezed out under load.

Husqvarna String Trimmers. Fuel & Lubrication

Gear lubricant must have good corrosion protection properties and effectively protect components against rust formation due to atmospheric moisture.

The lubricant selection is based on these requirements.

You need not rack your brains but can buy specialised products for the maintenance of electro or gasoline power washers. Such materials are now available in large quantities, both from manufacturers of motorcycle and electric scrapers, and from other companies.

To make life easier for the user, well-known manufacturers sometimes offer universal lubricants that are suitable for the maintenance of all garden equipment of a given brand. The following materials may also be used.

Gearboxes can be maintained with general purpose lubricants. Main. to be as suitable as possible for the operating conditions and contain anti-wear additives and filler in the form of solid lubricants (preferably molybdenum disulfide).


This American NAC product was developed for the lubrication of brushcutter bevel gears. Produced from mineral oil thickened with lithium complex and a special set of additives.

The grease is water-resistant and has excellent antioxidative and anticorrosive properties.

Champion EP-0

This is a universal lithium grease of NLGI consistency 0 for gears subjected to heavy mechanical loads.

The grease provides long-term lubrication, prevents corrosion, protects against wear and scuffing, and effectively reduces friction loss.

The grease is available in tubes of 50, 120 and 250 ml.

Hammer Flex 501-027

This special semi-fluid grease for toothed gears of electric and gasoline power tools contains EP and anti-wear additives and enables long-term reliable tool operation.

Lubricant penetrates well into the friction zone and has excellent lubricating and heat dissipating properties, preventing overheating of the unit.

Many users even use a cheap conventional grease, such as SchRUS 4 or Lithol 24, for grass trimmer lubrication.


It is a mineral lithium grease with molybdenum disulfide and additives. Availability of solid-lubricant filler provides it with high load-carrying ability.

CVL 4 also has excellent extreme pressure properties, good corrosion protection. It reduces friction as much as possible and minimizes wear on the friction surfaces.

Significant advantage of this material is its low cost.

Grease is produced by many Russian manufacturers and is available in various packing variants.


LITOL 24 grease, like the previous one, was developed in the USSR and became very popular due to its universal use and availability.

It is a lithium pure mineral grease without any fillers and additives.

At present there is a large number of more advanced greases.

It has a low level of performance, but it still provides a short-term protective and anti-wear function.

grass, trimmer, filled

Incredible low cost makes it still attractive for many owners of garden tools.

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