What to fill in the gearbox of a brushcutter

Full disassembly of the brushcutter gearbox to remove wear and tear and change lubricant

How to use grease to delay brushcutter gearbox repair? Whatever model of brushcutter, the second most important assembly after the engine is the gearbox, which consists of two helical gears, the smaller of which. the leading, the larger. the driven.

The gearing, which rotates in the bearings, is located in a housing that consists of two symmetrical halves and is bolted together. The drive pinion receives rotation from the engine on the rod, which ends with splines (usually 7 or 9), the driven one transmits rotation to the spindle, which serves for attaching the working organ. a drum with a fishing line, ropes or a cutting disc. The pinion bearings on the spindle side are sealed with an oil seal that protects the bearings and the grease in them from contamination. There is a bolt on the housing for replenishing the lubrication. Unscrewing it will allow you to add oil while you are using the machine.

Regular lubrication of the brushcutter gears is so important that it is worth talking about separately. If you exclude work with cutting discs, when it clings to a stone or curb and sends a counter shock impulse into the gearbox, which leads to the breakage of the tooth of the driven gear, parts of which gradually spoil the whole meshing, lubrication can delay the repair of this important unit and prolong the service life several times.

Disassembling gearbox to check it and replace grease and wear particles

To do this, disconnect the cowl from the gearbox and the shaft with the shaft inside. Remove the operating rod from the spindle and wash the pinion assembly to make it easier to disassemble. Unscrew the plug bolt, but it can be left in place, t. к. it does not carry any load.

Then pull the pinion assembly out of the housing. To do this, use a special puller to remove the retaining ring from the ring slot, which holds the pinion assembly in position in the housing.

Since the bearings are installed with their outer ring in the seats with interference, it is not easy to remove them. To make this task easier, heat up the gearbox housing in the bearing area with a construction hair dryer.

As soon as the body metal heats up, it expands and the tension disappears. Now you can easily remove the helical drive pinion assembly with two identical paired bearings from the housing.

Proceed to remove the idler block with the spindle from the gear housing. here first remove the centering bush with a pair of pliers with narrow jaws, then the stuffing box by prying with a screwdriver or other suitable tool.

As in the first case, pull out the retaining part by squeezing it with a locking ring puller, using the holes in the lock for this purpose.

We heat up the gear housing around the pinion bearing block with a hairdryer and pull it out after a while by pulling the spindle slightly.

How to lubricate the gearbox of a brushcutter in a simple way

How to correctly lubricate the gearbox of a brushcutter? Many trimmer users do not attach importance to overheating of the mowing head gearbox. And, of course, when it breaks down they immediately run to a repair shop. To save time and money on repairs, just lubricate the gearbox before the season and forget about unnecessary costs.Gearbox. One of the most stressed parts in this device and fails quite often. That’s why it definitely needs periodic maintenance.


Take a syringe and temporarily remove the piston. Put grease in the cylinder. This amount is usually 5-10 grams (for the exact amount see the manual of the brushcutter).

Don’t be lazy to spend a minute or two after buying your brushcutter and before 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.

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

Many trimmer users do not pay much attention to maintenance of their tools. In particular, this applies to such a brushcutter assembly, as gearbox. Gearbox work involves heat.

If you use your brushcutter for a long time, the gearbox heats up regularly and overheats and breaks down. Gearbox breakage leads to the fact that the tool is unusable and needs to be repaired.

Repairing a gearbox is a costly affair, so it is recommended not to let the tool go to this condition. The main cause of gearbox overheating and failure is a lack of lubricant in the gearbox.

The article tells how to properly lubricate the trimmer gearbox for grass to avoid its breakage.

Tools and materials required

The following tools and materials will be needed to maintain the gearbox:

Allen wrench to open the lubrication hole in the gearbox

Usually, such a wrench comes with a brushcutter or trimmer.

The next tool is a 10-ml medicine syringe. It is the grease gun that you use to get the lubricant into the gearbox.

It is advisable to use a lubricant that comes from 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 quite simple to do. you just unscrew the gear bolt with an Allen key. The grease nipple on all brushcutters is in the same place. near the tool.

Action Filling the Syringe with Oil

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

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

Then fill grease reservoir cap with grease.

Then the piston is reinserted into the syringe. Syringe is ready to add grease to the Geareducer.

Action Filling the gearbox with grease

Insert a syringe into the reducer bore

First of all, the grease gun is inserted into the reducer bore.

Squeeze some grease into the gearbox and turn it about a quarter of a turn

Then squirt some grease into the Geareducer and turn it about a quarter turn.

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

Fill in small portions of grease. After each grease squeeze, turn the Geareducer 1/3 to 1/4 turn. It is advisable to choose the lubricant quantity for each filling so that the Geareducer completes a full revolution during lubrication.

Action Sealing the gearbox

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

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

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

Feedback from our readers is very important to us. Leave your rating in the Комментарии и мнения владельцев with arguments for your choice. Your opinion will be helpful to other users.

Main gearbox malfunctions and troubleshooting

Various damages can happen to the gearbox of an electric or gasoline grass trimmer. The most common of them are presented in the table below. Here you can also find causes and solutions.

Gearbox Failure Possible causes Remedy
Gearboxes are too hot Use of unsuitable (low-quality) lubricant or its absence Lubricant must be changed or added
gears are new and have not friction to run in for a short time without heavy loads and with regular stops, so that the mechanism has time to cool down
the shaft is seized when turning, play and knocking is encountered One of the bearings has deteriorated or excessively worn out the failed bearing is replaced with a new one
Transmission mechanism comes off the brushcutter bar or is loose damage of its body part must be replaced
In some cases for minor damage use a wire clip made of metal to tighten the fracture
is not fixed on the pipe wear at the mating location Wrap insulation tape around the joints or change the shaft
output shaft with blade does not rotate or stops when the load increases Worn gears or one of the gears the cooperating pair of worn-out parts must be replaced

Bearings are destroyed by the use of unsuitable grease or by the absence of it. They also get damaged if the brushcutter is subjected to hard working conditions and if foreign material (e.g., broken metal teeth in the manual transmission) gets in because the integrity of the dust cover is compromised.

To remove a bearing, you need to disassemble the gearbox and use a special puller. If it is not available, you can try to do it with a hammer with a tool. In this case, work carefully so as not to damage the seating. Do not use preheating to remove the bearing in this case. This is due to the fact that the metal can lose the desired performance characteristics.

If the blade stops rotating under load or does not turn at all, you will hear an unusual noise.

Most gearbox problems can easily be repaired with your own hands. Replaceable parts should only be used if they are “genuine” and designed for the model of brushcutter in question.

Boom and tool drive

The rod has two very important functions: the first is that it forms a rigid framework for the entire structure, and the second is that inside the hollow metal rod there is a shaft that connects the screed to the engine. By the appearance of the rod you can determine the class of the tool, if the rod is curved it is convenient for work, but in this case the drive is a flexible shaft that can not transmit a lot of torque. If the rod is straight, with a rigid metal rod running inside, it is much more reliable and can transmit more torque. This is why professional tools always have straight shafts.

The gears should be regularly lubricated according to the recommendations in the instruction manual of the model in use. This should also be done if:

In addition to the gearbox, the shaft of the grass trimmer should also be regularly lubricated. This is the proper care of the machine.

Constant use of the grass trimmer causes stress on the transmission mechanism through dirt and deposits on the blades of grass or through changes in torque. You should choose a quality lubricant to extend the service life of your gearbox.

Types of grease used

When choosing a lubricant, you need to consider such factors:

Well-known manufacturers, such as STIHL, Husqvarna and others, in addition to trimmers, also produce lubricants for them. Such products not only reduce wear and tear, but also protect the gear metal from corrosion. That’s why it’s best to use lubricants for these brushcutter brands.

If the grease used for lubrication has good adhesion, it hardly ever squeezes out of the gearbox through the gaps.

Grease consumption varies from model to model. This is determined in large part by the intensity of use of the brushcutter and the heating of the transmission mechanism. It is believed that the lubricant is sufficient if the temperature of the gearbox during operation does not exceed 40 ° C.

By consistency, grass trimmer lubricants can be:

In terms of composition, the following types of grease are in demand:

  • graphite greases that significantly reduce friction, resulting in improved gear rotation;
  • Lithium-based, which is also an excellent corrosion preventive composition, saturated with additives that increase the resistance to metal wear without harmful substances;
  • universal, highly refined mineral oils and performance enhancing components.

Examples of suitable lubricants are: Champion EP-0, Gear Grease OREGON, Oleo-Mas, Azmol 158, Lithol.24. You should also pay attention to the manufacturers’ advice on this matter and use the materials offered by them. You can buy them at specialized outlets.

Champion EP-0 Universal Grease 120 gr

Algorithm of self-lubrication of the gearbox

To perform lubrication of the gear mechanism it is not necessary to disassemble it beforehand. The device already has a special hole for this purpose (it is shown in the photo below). In addition to gears, it is necessary to pay attention to such elements of the mechanism during lubrication:

Pour oil or solid lubricant through the grease fitting with the screw. Do it in the following sequence:

  • Clean off dirt and adhered grass from the gear housing, especially the area around the plug, so that debris does not get inside the mechanism;
  • unscrew the plug using the appropriate tool (often included with the trimmer)
  • The selected lubricant is injected into the open process hole from a tube or using a syringe, as shown in the photo below;
  • Screw the plug into place.

When applying grease, rotate the knife so that it is evenly distributed over the teeth of the moving gears.

If for any reason the reducer must be disassembled, the old lubricant must be completely removed from the entire surface of the gears and housing, the shaft, and only then use the new. It is convenient to lubricate the disassembled mechanism with solid compositions.

The whole process of lubricating the gearbox is demonstrated in the video clip:

You should lubricate the transmission unit at least once a year, but it is recommended to do it every 20 hours of heavy use of the brushcutter. If the first signs of malfunctions with the mechanism appear, you should apply lubricant as soon as possible.

Gearbox Grease for Grass Trimmer. With what and how to lubricate?

Sometimes, in the midst of intensive mowing work, your grass trimmer begins to make unpleasant, grinding noises. It’s the lack of lubrication that complains about the gearbox. the most heavily loaded part of the device. And these “warnings” may soon be followed by a jammed actuator.

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

During operation, the mechanical part of the grass trimmer is loaded with contact forces on the teeth, reactions of resistance from grass clinging (sometimes. with dirt), dynamic, shock loads due to constantly changing torque. Grass trimmer gear lubricant must be compatible with these characteristics and the brand selection must be strictly personalized.

The following factors are taken into account:

Lubricant consumption also depends on the temperature at which it retains its lubricating power. When the gearbox is heated up to 40° C, it is considered that the conditions of its operation are satisfactory and the lubricant is sufficient.

There is not supposed to be a universal lubricant for the gearbox of a grass trimmer, but this is not exactly true. In fact, a suitable lubricant would be one that has the following components:

  • Antiwear additives that do not contain toxic lead;
  • Solid lubricants in the presence of graphite or molybdenum disulfide (the latter is preferable as its lubricating power is fully retained over a wide range of shaft speeds);
  • Mineral only (inorganic!) Oil with a high degree of purity.

Lithium-based greases Gear Grease OREGON or Champion EP-0, domestic compositions Oleo-Mas, Lithol fully meet the above requirements.24, or Azmol 158, as well as those recommended by the manufacturer of a particular model of grass trimmer.

How to lubricate the grass trimmer gearbox?

There is a technological hole in the upper part of the body, where the gear block is installed, which is plugged with a screw when operating the grass trimmer. This screw is unscrewed and 1,5 2 ml of grease is injected into the hole using the spout on the tube. If the grease has been purchased in a different packing, then for this operation also an ordinary disposable medical syringe is suitable.

After that, the screw is installed in its former place. This procedure, regardless of the user’s recommendations, should be performed every 1015 hours of operation of the grass trimmer in working mode. Other reasons to refresh or replace the gearbox lubricant are to carry out minor routine maintenance on your own (e.g. cleaning and washing gearwheels before the summer season), to repair the unit, to preserve the grass trimmer for the winter, etc. д.

If a gearbox assembly is disassembled, it is advisable to completely remove all traces of previous grease from the surface of the parts, even if there are no signs of oxidation and contamination. Only then should new grease be applied. After applying the lubricant it is recommended to turn the shaft a few times by hand and make sure that the lubricant is evenly distributed on all parts of the gear.

When lubricating, special attention should be paid to the following elements:

Grease for grass trimmer gearbox: peculiarities of selection and application of composition

The grass trimmer may rattle and make unpleasant noises during intensive mowing, which is an indication that the gearbox is not properly lubricated. The gearbox is considered the most stressed part, so it wears out the most quickly. If it is not lubricated in time, it can soon be jammed!

Selection of lubricant

During grass mowing, the mechanical component of the grass trimmer is loaded with shock loads due to constantly changing torque, contact forces on the tines, dynamic loads, and the resistance reactions of clogged dirt and grass. New grass trimmer gear lubricant must take into account all the above mentioned points, so the choice of lubricant composition is made individually in each case.

  • Intensity of grease consumption by the gearbox. Many trimmer manufacturers, relying on their service centers, don’t give any information about how long the gearbox will work between lubrications. So it’s often necessary to choose on the basis of expert recommendations and your own experience.
  • Lubricant Viscosity. Modern lubricating compositions are divided into 3 types: solid, softening during operation, plastic compounds for universal use and high viscosity mixtures with various additives.
  • Manufacturer’s brand. Every manufacturer, whether Makita, Husqvarna, Huter or STIHL, necessarily focuses on their own formulations. Exceptions are domestic grass trimmers, the instructions of which do not say a word about the type of lubrication for operation.
  • Adhesion of the composition to the gearbox surface. It is important that the grease does not leak out of the unit or into gaps during operation.

Lubricant consumption is also affected by the temperature at which the mixture retains its lubricity. This is how a gearbox surface heated to 40 degrees is considered optimal for lubrication, the amount of which is considered sufficient.

There is an opinion that the lubricant for a gearbox cannot be universal, but this is not quite right. In practice, the optimum grease is one that contains both

  • Inorganic mineral oils with good cleanliness;
  • Molybdenum disulfide or granite solid lubricants. And the first option is more preferable, because with it the lubricating ability remains as long as possible with a large number of revolutions of the shaft;
  • Antiwear additives without toxic lead.

Lubricants recommended by the manufacturer of a particular grass trimmer model, domestic compositions Azmol 158, Litop-24 and Oleo-Mas, as well as lithium compounds Champion EP-0 and GearGrease OREGON can boast the listed requirements.

How to properly lubricate the gearbox of a grass trimmer?

At the top of the body, where the gear unit is located, there is a technological hole, which is covered with a screw during the operation of the grass trimmer. This screw is unscrewed and 1.5-2 milliliters of grease is introduced into the hole from the tube’s spout. If you have purchased a different packaging, you can use an ordinary syringe to put the mixture into the hole. After the screw is placed in its rightful place.

This operation, regardless of the user’s recommendations, should be repeated after every 10-15 hours of operation of the grass trimmer. In other cases, the replacement and renewal of the gearbox grease is made when preserving the device before the winter, repairing the node, washing and cleaning the gears at the beginning of summer, etc.п.

Once disassembled, before applying new grease, it is worth initially completely removing the remains of the old mixture, even if they are not contaminated or oxidized.

After applying new grease, turn the shaft a couple of times by hand to be sure the compound is evenly distributed on all surfaces of the gearbox.

It is important to pay special attention to the following grass trimmer components in the process of applying lubrication:

  • Bearings with worn seals allowing grease to escape during machine operation. If there is a lack of lubrication in this case, the device begins to vibrate noticeably. This often happens with Chinese models, when choosing which you should think in advance about replacing the bearing unit with the highest quality analogue, for example, Swedish SKF.
  • The starter coil dog, since it often touches the grooves on the flywheel when the drive is engaged. in addition to mechanical wear and tear, there is mechanical and chemical corrosion between the handwheel and dog connections because they are made of different materials: the handwheel is made of steel and the dog is made of aluminium.
  • Handwheel, on the surface of which grass residue usually accumulates, and as you know, the thickened grass sap has an excessive resistance.

Grass trimmer gear lubricant is selected based on many of the parameters described above. Take them all into account carefully, and then the product will serve you well for a long time, always delighting you with a mowed lawn and a well-cleaned area.

Frequency of treatment

Anyone who knows how to lubricate a modern brushcutter gearbox quickly finds the right lubricant. Proper care is a guarantee of long grass trimmer use without repair. In this regard, the mechanism with gears is lubricated after ten hours of operation of the device or in case of gearbox overheating. This is determined by the usual touch of the hand to the body of the product. The main thing is to choose the right trimmer for the grass. If you need to care for a large lawn, it is better to fit a professional model with an enlarged gearbox.

The gearbox is used to drive the rotating mechanism and “make” it work. Its design can be different, depending on the purpose of the tool.

They are also used to drive the brushcutter mechanism. On the market, you can reduce or increase the speed of the gearbox for grass trimmer of different types.

Popular are two- and three-stage models of twin or unfolded schemes, which are resistant to stress and have a high level of efficiency.

  • Worm. Compact tool is the most common type. Increased torque, ease of construction. The worm model does not make noise, but still gives high performance. Self-locking function is a special feature of the tool.
  • Globoid worm. It has a slightly convex shape, with high drive power and increased torque.
  • Cylindrical. Model has spur gears, variable design, high power. Service life is from 25,000. hours.
  • Conical. Circular, straight toothed wheels are used in the design. It is characterized by high operating endurance and simple design.
  • Conical-cylindrical. Designed for large equipment only. Has a low load capacity.
  • Attachment. It is mounted on the output shaft, without additional gears, connections. Compact and lightweight.
  • Planetary. One of the most powerful tools with a sophisticated design. Mainly used in mechanical engineering.
fill, gearbox, brushcutter

Gearbox of the brushcutter is basically a helical-worm type. It provides high quality trimmers.

Process of lubricating the gears

When lubricating the gearbox, located in the upper part of the trimmer for grass with plastic or thick grease, remove the housing cover and only then put the grease on its gears. But before that, the used lubricant is removed.

Varieties of lubricating compositions

Different consistencies of grease are used for machine maintenance:

  • Semi-liquid. Such compositions contain a variety of additives and additives.
  • Plastic. They are the most universal grease consistency. Used most often for gear and helical gears.
  • Solid. Plate slurries in their original state.

Special gear composition refers to a semi-liquid system.

STIHL grass trimmer grease is very popular. Special formulation and ingredients greatly reduce wear and increase resistance to corrosion. The main properties of this brand of lubricant are:

STIHL grass trimmer grease is suitable for brushcutters and trimmers and all transmissions with closed housing.

Gasoline grass trimmer maintenance

Most brushcutters and trimmers have a flexible shaft. You should check its condition at least once per 50 working hours. To do this, you must remove the boom tip, pull out the shaft, inspect it and then lubricate.

For the care of the shaft will suit inexpensive materials, it is more difficult to pick them for the grass trimmer gear. What to lubricate this mechanism. depends on the company-manufacturer of the tool. It is best to use materials that contain molybdenum disulfide. The latter provides smoothing and filling cracks in the working surface, so it is especially appreciated among users.

Important: the use of a large amount of grease with high density leads to overheating of the mechanism, increased friction of working pairs and fuel consumption. That’s why the process of materials selection and preventive maintenance should be treated responsibly.

User feedback on 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 how to lubricate the grass trimmer’s gearbox. Experienced users do not advise to use solidol, because this material is not suitable for the temperature and speed characteristics of the node, as well as the consistency. This material also has no antiwear properties.

The working temperature range of solidol. from minus 40 to 65 degrees, but even at such parameters in the process of heating density of the material increases, and the grease itself becomes coarse. In the event of an emergency, “Lithol-24” may be used.

Gasoline grass trimmer maintenance

Most brushcutters and trimmers have a flexible shaft. Its condition should be checked at least once every 50 working hours. To perform this operation, you need to remove the boom tip, pull out the shaft and inspect it, then lubricate.

For the care of the shaft will be suitable for inexpensive materials, it is more difficult to find them for the trimmer gear for grass. What to lubricate this mechanism with. depends on the tool manufacturer. It is best to use materials that contain molybdenum disulfide. The latter ensures smoothing and filling of cracks in the working surface, so it is especially valued by users.

Important: the use of large quantities of grease with high density leads to overheating of the mechanism, increased friction of the working pairs and fuel consumption. That’s why materials and preventive maintenance have to be chosen responsibly.