How to lubricate the gear reducer of the grass trimmer Champion. Lubrication of the lower and upper gearbox

Repair and lubrication of the grass trimmer gearbox

If you use your brushcutter a lot, the gearbox can get hot or make unusual noises, such as grinding, that are unusual for normal operation. This indicates that the mechanism needs to be lubricated. If this is not done in time more serious problems will occur (for example, the gears will quickly wear out and need to be replaced), up to and including jamming. Other malfunctions also occur with the transmission unit. Repair and lubrication of the gearbox can be done independently. for this you just need to familiarize yourself with the peculiarities of these works and have some available tools.

Gearbox trimmer for grass. a node that transmits the rotational motion of the motor shaft to the blade or fishing line. It is located at the lower end of the brushcutter bar. The transmission unit is also used to reduce the engine speed of the grass trimmer.

Depending on the brushcutter model, the mechanism consists of several gears that rotate at high speed. This causes them to become hot because of the friction. If the lubricant is not enough, or there is none at all, the process leads to severe overheating and failure of parts, and, accordingly, the need for complicated repair. To prevent this from happening, you should lubricate the transmission unit in good time. The disassembled gearbox is shown in the photo below.

Gearboxes of modern trimmers of different models from different manufacturers differ from each other by design and the size of the seating. They are of the following types:

The most common diameters of round seats are 24, 25.5 and 26 mm.

Mowers are equipped with gearboxes with different types of gears:

  • conical;
  • worm;
  • spiroids;
  • cylindrical;. worm;
  • planetary;
  • wave gears;
  • combined.

The drive shaft and gearbox are heavily stressed parts of the grass trimmer that are highly susceptible to wear and tear. Between them the motion is transmitted because of the meshing of the gear teeth, located at different angles to each other. The spur gear only works properly if there is no mechanical damage. The mechanism must not overheat, otherwise it can jam.

What kind of grease should be used for the gearbox of a grass trimmer?

During operation, the mechanical part of the grass trimmer is loaded with contact forces on the teeth, resistance reactions from grass clinging (sometimes. with dirt), dynamic, shock loads due to constantly changing torque. Lubricant for the grass trimmer gearbox must fully take into account these features, so the selection of the brand should be strictly individual.

The following factors are taken into account:

  • Manufacturer’s brand. Repair of grass trimmer Champion t 336 with your own hands lawnmower how to lubricate the shaft pcs video. Example. Each brand is not unreasonably focused on lubricants of its own making (we can talk about cheap Chinese products later). This applies to manufacturers such as Husqvarna, STIHL, Huter, Makita, etc. The exception is trimmers for grass of domestic production: for example, Kalibr in the user’s manual does not indicate the brand of lubricant at all.
  • Viscosity of the grease. It is known that all lubricating compositions are divided into three groups. high-viscosity (colloidal systems containing various additives), plastic compounds for universal use, and solid lubricants that soften during operation.
  • Good adhesion to the surface of the gearbox parts, as a result of which the grease does not squeeze out into the gaps or out of the unit.
  • Intensity of grease consumption by a gearbox. Here we have to rely on our own experience and the recommendations of specialists, because some trimmer manufacturers, relying on their own service centers, do not give clear recommendations on the period of operation of the gearbox between two lubrications.
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Features of different types of gearboxes

Electric and chain saw manufacturers equip their machines with different types of gears. Usually they differ from each other by shape and dimensions of the seating, which is made in the form of a circle (popular diameter. 24, 25,5 and 26 mm), square or star.

Another difference between gearboxes of Russian, Chinese and European brands. types of gears. It can be conical, worm, spiroid, combined, wave, planetary, cylindrical. Usually worm gears are used on chain saws.

You will need

Take a syringe and temporarily remove the piston. Put grease in the cylinder. It is usually 5-10 g (more exact amount is written in the instruction manual of your brushcutter).

Don’t be lazy to spend a few minutes after buying the brushcutter and before the mowing season to lubricate this important assembly. And your tool will always be ready to work at any time and will serve for many, many years.

Tools and materials required

You will need the following tools and materials for gearbox maintenance:

Allen wrench for opening the lubrication hole in the gearbox

This wrench is usually bundled with your brushcutter or trimmer.

The next tool is an ordinary 10 ml medical syringe. That is how the grease gets into the Geareducer.

We recommend you use oil that comes from the brushcutter manufacturer. As a last resort, you can use any rotary gear lubricant, e.g. Lithol 24.

Action Open the gearbox

To access the Geareducer you need to open it. It is easy enough to do. unscrew the gearbox bolt with an Allen key. The bolt for all brushcutters is in the same place. near the tool.

Action Fill the syringe with oil

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

To get the grease flowing into the reducer without any problem, you should use a grease gun.

Then fill the syringe with grease from the tube.

The piston is then reinserted into the syringe. The grease gun is ready to add oil to the reducer.

Action Filling the gearbox with grease

Syringe is inserted into the gearbox bore

First insert a syringe into the gearbox bore.

Press a little grease into the gearbox and turn it about a quarter turn

Then pour some grease into the gearbox and turn it about a quarter turn.

When you have squeezed out all the grease, the process is complete

Use small portions of grease. After each grease squeeze, turn the gearbox by 1/3. 1/4 turn. It is desirable to choose the amount of grease at each filling so that the gearbox makes a full revolution during the greasing process.

Action Sealing the Geareducer

After the reducer has been filled with grease, screw in the bolt on the reducer and tighten it well.

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

How to lubricate the gearbox of grass trimmer or brushcutter: proper maintenance of garden tools | (Photo Video)

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Grass trimmer gearbox design

The grass trimmer gearbox is the part that transmits the rotary motion of the engine shaft to the blade or the line. It is located on the lower end of the brushcutter bar. The gear unit is also designed to reduce the engine speed of the grass trimmer.

Depending on the brushcutter model, the mechanism consists of several gears that rotate at high speed. This causes them to get hot because of the strong friction. If the lubricant is not enough or there is none at all, the process leads to severe overheating and failure of parts, and therefore the need for complicated repair. To avoid this, it is important to lubricate the transmission unit in good time. The disassembled gearbox is shown in the photo below.

The gearboxes of modern trimmer models from various manufacturers differ from each other in design and seat size. It comes in:

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The most common diameters for round seats are 24, 25.5 and 26 mm.

Mowers are equipped with gearboxes with different types of gears:

  • tapered;
  • worm gears;
  • spiroids;
  • cylindrical;
  • planetary;
  • Wave gears;
  • combined.

The drive shaft and gearbox are heavily stressed parts of the grass trimmer that are subject to considerable wear and tear. Motion is transmitted between them because of the meshing of the gear teeth, which are at different angles to each other. gearing only works effectively if there is no mechanical damage. The mechanism must not overheat, otherwise it can seize.

characteristics and application on the vehicle

Basic functions of bearing grease

The application of grease has a specific purpose:

  • Reduction of friction and, therefore, wear on the contact surfaces of the parts.
  • Increase in the sliding parameter of the surfaces when deformed due to the occurrence of load.
  • Formation of an oil film to cushion shock loads during operation.
  • Uniform distribution of heat generated in the friction process.
  • Protection against corrosion.
  • Prevent ingress of dust and other contaminants.
lubricate, gear, reducer, grass, trimmer

In order for the selected rolling bearing grease to meet the above requirements, the operating conditions of the machine or machine should be taken into account.

Lithium grease

The main peculiarity of lithium grease for bearings is its high water repellency. Greases of this group are highly viscous and have one of the widest operating temperature ranges. For this reason lithium grease is considered to be the most universal one and is used in many parts of mechanisms and machines.

How to lubricate a brushcutter gearbox

Magazine bearings and other sliding contacts Lubricating grease is used for pins, bushings, sliding contacts as well as plain bearings that experience shock loads, frequent starts and stops or reverse direction. In such cases, grease provides a thicker lubricating film than oil and protects against wear during boundary lubrication.

The grease used in a plain bearing must be replenished periodically. The frequency required for regreasing depends on the lubricating efficiency of the grease, its thermal stability and the rate at which wear occurs. Bearing temperature has the greatest impact on grease life. As with ball bearings, higher temperatures increase the rate of oil loss from the grease structure through oxidation, leakage, and evaporation. With drying, grease tends to thicken and loses its ability to distribute in the bearing and replenish boundary films.

This lubricant is produced as a mixture of synthetic materials and mineral oils. Various organic and inorganic substances are used as thickeners. The viscosity of the substance decreases as the number of revolutions of the bearing increases. Some of the best known lithium greases include popular materials such as CYATIM-201, 202, OKB 122-7. CYATIM-203 and VNIINP-242 are widely used in sealed bearings.

Figure 1 shows the recommended continuous operating times for applications such as plain bearings in farm and construction machinery as a function of bearing temperature. 4. Another problem with a heavily loaded design. Their oscillating nature of operation. a condition that can be more severe than the continuous, unidirectional speeds common to most machines. Damage or failure can be a problem here. Experiments show that the coefficient of friction can suddenly increase after a few cycles with little warning.

In the home

The consumable is used to lubricate bicycle chains, locks, door hinges of apartments, garages, and cable drives of brake systems. Due to its density the grease can be mixed with solvents. As a result, the substance gets into places that are difficult to reach. After application the solvent evaporates and the grease remains. The product can be used in the treatment of rubber and plastic parts, as well as surfaces impregnated with paint coatings.

Grass trimmer grease locations

For smooth operation and a long service life, the mechanism should be inspected and maintained carefully. Lubrication of moving parts is important. In most cases these are:

Trimmer repair replacing the bevel gear head. Brushcutter MacAllister Stihl stiga

  • the place from the transition from the engines to the direct shaft;
  • junction of a straight shaft with a flexible shaft;
  • the shaft with the seating head transition;
  • gearbox.

Multipurpose water-resistant grease “Lithol-24” is popular among the users. Operating temperature range. from.40 to 120 degrees. This grease is used in friction units and is effective at higher temperatures.

How much grease to use when replacing in the gearbox of an angle grinder

If the amount of grease in the bearings is checked by pouring it out from the back, the angle grinder has a certain amount of grease in the gearbox. Excess grease will leak out as you work. But a small amount of grease would not make a good gearbox work.

In a gearbox should leave as much grease as necessary to be covered gear teeth.

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As a guide, apply as much lubricant as is needed to fill a little less than half of the gearcase cavity.

How to Grease a Gearbox on a Trimmer Gasoline Grass Trimmer

Side bolt 17 on the gasoline grass trimmer gearbox

For safety reasons, all maintenance work on the brushcutter is always carried out with the electrical cap / plug removed from the spark plug. Do not turn the weed trimmer upside down to avoid gasoline leakage.

Unscrew the side screw on the brushcutter gearbox. Depending on the respective manufacturer of your garden tool, there may be a hexagon socket screw instead of the hexagon socket screw, most commonly a wrench size 17. The threads are unscrewed counterclockwise. Don’t lose the sealing washer.

If you can’t see any grease on the inside face of the screw, you need to add 3 to 4 grams. Turn the transmission by hand, changing the direction of rotation, so that the grease spreads to the gears.

Repeat the operation a few times. On average, about 5 to 10 g goes into the gearbox. The assembly should be completely filled with grease, taking into account the installation of the screw.

Then put the screw in place, tighten it firmly.

As you can see, you do not need much time or special skills to lubricate the gearbox on your brushcutter. Usually takes longer to assemble than to do all the preventive maintenance work. Have fun with your gardening equipment. Share your experience in the Комментарии и мнения владельцев about maintenance of gasoline trimmers.

How to lubricate the gearbox of a lawnmower correctly

First thing to do is to remove the gearbox from the boom. Detailed assembling-disassembling process can be seen on video at the end of the article. Unscrew the bolts from the gearbox housing.

Take the gearbox grease gun and squeeze it into the grease hole in the housing.

It is important to fill the gearbox with grease until it is completely full, so to speak. It will avoid the formation of air s.

After greasing we assemble everything in the reverse order. Screw the bolts back in place and mount the gearbox on the boom. That’s actually all there is to it. The main thing is not to spite grease.

Many will tell you that you can’t use so much grease that it will cause all sorts of problems with the lawnmower. But in fact, everything is much easier and there is no reason to panic.

At high rpm (about 6000-6500 rpm) the lubricant is pressed into the casing of the gearbox.) Excess grease is squeezed out of the gearbox via the bearings and through the splines into the boom. And as a result, there is only as much grease as is needed for operation.

For details on how to lubricate the gearbox of a lawnmower, you can watch the video below. Advice shared by the author of the YouTube channel “repair Nick TV”.

Users’ reviews of lubricants

Experts advise to use only original materials, the characteristics of which meet the requirements of the manufacturer. If there are none, you should clarify what to lubricate the trimmer gearbox for grass. Experienced users do not recommend the use of solidol, as this material is not suitable for the temperature and speed characteristics of the node, as well as the consistency. Also the given material does not have antiwear properties.

The working temperature range of solidol. from minus 40 to 65 degrees, but even with such parameters in the process of heating, the density of the material increases, and the grease itself becomes coarse. In case of an urgent need to treat the tool, you can use “Lithol-24”.

Check the Snowblower Gearbox for Grease