What lubricant for the gearbox of a brushcutter

Complete disassembly of the brushcutter‘s gearbox to remove wear and tear and change the lubricant

How to grease push back brushcutter gearbox repairs? No matter what brushcutter brand you use, the second most important assembly after the engine is the gearbox, which consists of two helical gears, the smaller of which is the drive gear and the larger the driven gear.

The gearing, which rotates in bearings, is in a housing made up of two symmetrical halves, and, bolted together. the pinion receives its rotation from the engine through the bar that ends in splines (usually 7 or 9), and the idler pin transmits the rotation to the spindle that serves to mount the tool, a reel of fishing line, ropes or a cutting disc. Spindle-side gear bearings are sealed with a gland that protects the bearings and grease from contamination. Oil replenishment is bolted to the housing and can be added while the tool is in use by unscrewing the bolt.

The regular lubrication of the brushcutter gears is so important that it is worth talking about separately. If you exclude the work with cutting discs, when it clings to a stone or a curb and sends a counter shock impulse to the reducer, which leads to tooth failure of the idler pinion, parts of which gradually spoil all meshing, lubrication can delay repair of this important unit and prolong service life in several times.

lubricant, gearbox, brushcutter

Disassembling the gearbox in order to check it and replace the lubricant and wear particles

To do this, disconnect the cowl and the shaft from the gearbox. We remove the cutting tool 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 thrust load.

Then pull 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 mounted with the outer ring in their seats with interference, it is not easy to pull them out. To make this task easier, heat up the gear housing in the bearing area with a construction hair dryer.

As the body metal heats up, it will expand and the interference will dissipate. Now you can easily remove the helical drive pinion unit with two identical paired bearings from the housing.

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

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

We heat the gear housing with a hair dryer in the vicinity of the bearings of the idler pulley and after a while pull it out by pulling the spindle lightly.

Grass trimmer gearbox design

The gearbox of a grass trimmer is the component that transmits the rotary motion of the engine shaft to the blade or the brushcutter. It is located at the lower end of the brushcutter bar. The transmission 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 heat up due to the high friction. If there is not enough lubrication, or no lubrication at all, the process leads to severe overheating and failure of the parts, and, accordingly, the need for complex repairs. 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. It can be:

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

lubricant, gearbox, brushcutter

The brushcutters are equipped with different types of gears:

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

Drive shaft and gearbox are heavily loaded parts of the grass trimmer that are subject to a high degree of wear. Movement is transmitted between them due to the interlocking of gear teeth located at different angles to each other. Gear transmission works effectively only if there is no mechanical damage. The mechanism must not overheat, otherwise it could jam.

Main gearbox faults and how to remedy them

Various breakdowns occur with the gearbox of an electric or gasoline grass trimmer. The most common ones are given in the table below. There you can also find causes and solutions.

Gear unit malfunction Possible causes How to remove
Transmission unit gets very hot Use of unsuitable (low-quality) lubricants or their absence Lubricant must be replaced or added
the gears are new and have not worn down run in for a short time without heavy loads with regular stops so that the mechanism has time to cool down
shaft galling during rotation, play and knocking One of the bearings is damaged or excessively worn out Replace the defective bearing with a new one
Transmission unit comes off the brushcutter bar or wobbles The housing is damaged Parts must be replaced
In some cases of minor damage, use a metal clamp to tighten the fractured area
it is not fixed on the pipe Wear of the coupling You can wrap insulation tape around the bearing location or change the shaft
Output shaft with blade does not turn or stops when load increases Wear of the teeth on the gears or one of them replacement of the interacting pair of worn parts is required

Bearings are destroyed by the use of unsuitable grease or by the absence of it. They are also damaged by hard working conditions on the brushcutter and by foreign particles in the material (e.g., broken metal teeth in mechanical gears) because the integrity of the dust cover is compromised.

To remove the bearing, you have to disassemble the gearbox and use a special puller. if it is not fixed, you can try to do it with a hammer with an insertion tool. In this case, work carefully so as not to damage the seating. It is not recommended to use preheating to remove the bearing. The reason is that the metal can lose the desired performance.

If the blade stops rotating under load or just stands still, it makes an unusual noise.

Most gearbox problems can easily be repaired with your own hands. Replaceable parts should be purchased as “genuine” replacement parts for the model of brushcutter in use.

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

How to correctly lubricate the gearbox of a brushcutter? Many trimmer users don’t attach much importance to overheating of the gearbox of the mowing head. And, of course, when a breakdown occurs, they immediately run to a repair shop. To save time and money on repairs, just lubricate the gearbox before the season and forget about extra costs.Gearbox. One of the most stressed parts in this device and fails quite often. So it definitely needs periodical service.

You will need

Take a syringe, remove the piston temporarily. Put grease in the cylinder. It usually amounts to 5-10 g (for more exact amount see your brushcutter manual).

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

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

Many trimmer users do not give much attention to maintenance of their tools. This applies in particular to the gear unit of a brushcutter. Gearbox work involves heat.

If you use your brushcutter for a long time, the gearbox overheats regularly, causing it to break. Gearbox failure makes the tool unusable and must be repaired.

Gearbox repair is an expensive measure, so it is recommended not to bring the tool to such a condition. The main reason for a gearbox to overheat and malfunction is that it is not lubricated.

The article tells how to properly lubricate the grass trimmer gearbox to avoid it breaking.

Tools and materials required

The following tools and materials will be needed for gearbox maintenance:

Allen wrench for opening the oil hole in a gearbox

Usually, such a wrench is included with a brushcutter or trimmer.

The next tool is an ordinary medical syringe with a volume of 10 ml. It is using a syringe to get the grease into the gearbox.

It is advisable to use original lubricant from the brushcutter manufacturer. As a last resort, you can use any grease for the lubrication of rotating mechanisms, such as Lytol 24.

Action Open the gearbox

In order to access the reducer, it must be opened. This is quite easy to do. unscrew the reducer screw with an Allen key. The bolt for all brushcutters is in the same place. near the tool.

Action Filling up the syringe with oil

The diameter of the tube does not match the Geareducer

To get the grease into the housing without any problems, you should use the grease gun.

Then fill the grease gun with grease from the tube.

Then insert the piston back into the syringe. The syringe is ready to add grease to the gearbox.

Procedure Filling the reducer with grease

Syringe is inserted into the reducer bore

First put the syringe in the reducer bore.

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

Then squeeze some grease into the gearbox and turn it a quarter turn or so.

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

Small amounts of grease are refilled. After each lubrication turn the gearbox 1/3 to 1/4 turn. It is advisable to choose the lubricant quantity for each filling so that the gearbox makes a full revolution during lubrication.

Action Sealing the Geareducer

After the gearbox is filled with grease, screw in the gearbox bolt 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)

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Boom and implement drive

The sprayer boom has two very important functions: firstly, it provides a rigid framework for the whole construction, and secondly, inside the hollow metal boom there is a shaft that connects the tool with the engine. You can tell the class of the tool by the appearance of the boom. If the boom is curved, it is convenient for work, but in this case it is driven by a flexible shaft, which cannot transmit a lot of torque. If the boom is straight, a rigid metal rod runs inside, much more reliable and the torque it can transmit more. That’s 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. You should also do this if:

In addition to the gearbox, you must also lubricate the grass trimmer shaft at regular intervals. This is the norm for proper maintenance of the unit.

If the grass trimmer is constantly used, its transmission mechanism is stressed by grass clinging to the blades, dirt or due to changes in torque. it is necessary to choose a high-quality lubricant to prolong the service life of the reducer.

Types of grease used

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

Wellknown manufacturers like STIHL, Husqvarna and others also make grease for their trimmers. These products not only reduce wear and tear, but also protect the gear metal from corrosion. Therefore, for brushcutters from these brands, it is better to use their same lubricant products.

If the correct lubricant has good adhesion, it does not press out of the housing out of the gaps.

Grease consumption differs from model to model. This is determined to a large extent by how intensively you use your brushcutter and the transmission heat. It is considered 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:

By composition, the following types of lubricants are in demand:

  • graphite, significantly reducing friction, resulting in better gear rotation;
  • lithium, which is also an excellent anti-corrosive compound, saturated with additives that increase the wear resistance of metal without harmful substances;
  • Universal, high-purity mineral oils and performance-enhancing components.

Examples of suitable greases are: Champion EP-0, Gear Grease OREGON, Oleo-Mas, Azmol 158, Lithol.24. Also observe the manufacturer’s recommendations and use lubricants offered by the manufacturer. You can buy them at specialized retail outlets.

Champion EP-0 Universal Grease 120 g

Algorithm of self-lubrication of gears

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

Pour oil or solid grease through a screw plug. The steps are performed in the following sequence:

  • clean the gear housing from dirt and clumped grass, especially the area around the plug to prevent debris from getting inside the mechanism;
  • With the appropriate tool (it often comes with the trimmer) unscrew the plug;
  • into the open technological hole to inject the selected lubricant from a tube or using a syringe, as shown in the photo below;
  • screw the plug back into place.

When applying the grease, it is necessary to rotate the knife, so that it is evenly distributed on 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. Lubricate the disassembled mechanism with solid lubricants.

The entire process of lubricating the gearbox is shown in the video:

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

How to Lubricate Grass Trimmer Shaft Video

Gear Lubricant for Grass Trimmer. With what and how to lubricate?

Sometimes, in the midst of intensive mowing work, your grass trimmer starts making unpleasant, grinding noises. Find out what the next lawnmower video will tell you about how to lubricate the grass trimmer’s disc shaft. It’s complaining about the lack of lubrication of the gearbox. the most heavily loaded unit of the device. And soon these “warnings” can be followed by jamming of the drive.

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

During work the mechanical part of the grass trimmer is subjected to contact forces on the tines, drag reactions from grass clippings (sometimes with dirt), dynamic, shock loads due to constantly changing torque. Grease for the grass trimmer gearbox should 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 their own hands lawnmower how to lubricate the shaft pcs video. Example. Every brand is not unreasonably focused on lubricants made in-house (we can talk about cheap Chinese products later). This applies to such manufacturers as Husqvarna, STIHL, Huter, Makita, etc. The exception is grass trimmers of domestic production: for example, Kalibr in the user manual does not indicate the brand of lubricant at all.
  • Viscosity of the grease. It is known that all lubricating compositions are subdivided into three groups. high-viscosity (colloidal systems containing various additives), plastic compounds of universal use and solid lubricants softening during operation.
  • Good adhesion to the surface of the gearbox parts, as a result no grease is squeezed out into the gaps or out of the unit.
  • Intensity of lubricant consumption by the gearbox. Here we have to rely on our own experience and recommendations of experts, as some manufacturers of trimmers, trusting in the existence of their own service centers, do not give clear recommendations about the period of the reducer between two lubrications.

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

HIGH VIBRATION WHILE Mower WORKS How to Lubricate Boom Shaft

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Check. Are the shafts of your brushcutters greased? It’s probably dry!

It is believed that there is no universal grass trimmer gear lubricant, but this is not entirely true. In fact, a suitable lubricant composition will be the one that contains the following components:

  • Antiwear additives that do not contain toxic lead;
  • Solid greases with graphite or molybdenum disulfide present (the latter is preferred as it retains all the lubricating power for a wide range of shaft speeds);
  • Mineral only (inorganic!) oils, with high purity.

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

How to Lubricate Grass Trimmer Gear?

In the upper part of the body, where the gear block is installed, there is a technological hole, which is plugged with a screw when using the grass trimmer. This screw is unscrewed and 1.5 to 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, an ordinary disposable medical syringe will also be suitable for this operation.

lubricant, gearbox, brushcutter

The screw is then re-installed. This procedure, regardless of user recommendations, should be performed every 10-15 hours of operation of the grass trimmer in working mode. If you are interested.see video on how to grease a shaft that won’t go in the boom. Other reasons to refresh or replace the gear lubricant are to perform minor routine maintenance (e.g., cleaning and washing gear wheels before the summer season), to repair the unit, to preserve the trimmer for the winter, etc. д.

If the gearbox assembly is disassembled, it is recommended to completely remove the remains of previous grease from the surface of the parts, even if it has no traces of oxidation and contamination. And only then apply new grease. After applying the lubricant it is advisable to turn the shaft a few times by hand and make sure that the lubricant is evenly spread on all parts of the gearbox.

How oil affects the performance of your power tiller

Special attention should be paid to the lubricant, the oil. It is important to note that the oil needs to be changed every 50 hours of operation. Also, do not overload the single axle tractor, as this can lead to rapid wear and tear of the equipment. Do not forget that it is undesirable to fit additional blades with your own hands. Geareducer chains suffer from additional loads (broken bushings), after which the chains begin to jump. How to disassemble the gearbox of the grass trimmer, Petrol AL-KO Classic 4 66 lawnmower. With heavy side loads, the thrust washer quickly wears out, so the alignment of the two gears is lost, and the bushings fly out of the chain. The conclusion can be made as follows: you do not need to work with the motoblock at an angle, as opposed to cleaner work, you will damage your vehicle, and you should be more careful to turn the single axle tractor when working.

After the melting of the snow cover with the first spring days the grass begins to emerge, which will delight you with a delicate green cover. However, just a few weeks later, all the irregularities and imperfections become noticeable, the weeds begin to rise above the lawn. From now on, it’s time to fight for the beauty of your lawn. Of course, to combat weeds you can use an ordinary scythe or sickle, but it is long and time-consuming, and the cut grass becomes ugly.

How oil affects the performance of a power tiller

Particular attention should be paid to the lubricating fluid, oil. It should be noted that the oil should be changed every 50 hours of work. Also, do not overload the single-axle tractor, as this can lead to rapid wear and tear of the equipment. Do not forget that it is undesirable to install additional blades with your own hands. Gear chains suffer from extra stress (broken bushings) and then the chains start to jump. How to disassemble the gearbox of a grass trimmer, Petrol AL-KO Classic 4 66 lawn mower. With heavy side loads, the support washer quickly wears out, so the alignment of the two gears is lost, and the bushings fly out of the chain. The conclusion you can draw is that you don’t need to work your power tiller at an angle, as opposed to a cleaner job, you will damage your vehicle, and you should be more careful to turn the single axle tractor when working.

After the snow melt with the first spring days, the grass begins to appear, which delights with a tender green cover. However, just a few weeks later, all the bumps and irregularities become noticeable, the weeds begin to rise above the lawn. From this point on, the battle for lawn beauty begins. Sure, you can use a regular scythe or sickle to control weeds, but it’s long and time-consuming, and the mowed grass gets ugly.

Performance

The choice of gasoline mowers, or they are also called by the name of the cutting device. grass trimmers, must be made on the amount of work, the more processed area, the more power is needed. For small areas are chosen household, for garden plots fit trimmers for grass middle class. farmer, for mowing a large area, especially if there are thickets of weeds or bushes, you need a powerful professional tool. a park. Such equipment has an engine capacity of more than 2.5 liters.с. and can run for 3 to 4 hours a day.

Most mowers are equipped with a gasoline engine (ICE), it can be two-stroke and four-stroke, there is no particular difference in them. Four-stroke is more economical and powerful, but more difficult to maintain and more expensive to repair. Two-stroke is easier to maintain, cheaper, but it is low-powered, consumes more fuel, has dirtier and noisier exhaust. There are also combined motors. In addition to gasoline engines trimmers for grass can be equipped with electric motors, which are connected to a household network 220V long cable, but, as a rule. it’s household devices as. are tied to the power supply wires.

Performance

The choice of gasoline mowers, or they are also called by the name of the cutting device. trimmers for grass, should be made on the amount of work, the more processed area, the more power is needed. For small plots choose household, for garden plots fit trimmers for grass middle class. farmer, for mowing large areas, especially if there are thickets of weeds or bushes, you need a powerful professional tool. park. Such equipment has an engine capacity of more than 2.5 liters.с. and can work 3-4 hours a day.

Gearbox trimmer for grass includes 2 shafts. the first has a drive from the engine, and the other is used to rotate the cutting blade of brushcutter or line electric trimmer. Bevel gears are made as one piece with the shaft, but there are versions with a separate part mounted on the spline joint. Models are available with different tooth angles, depending on the tool layout. Gearbox versions with worm, planetary or mixed (multistage) gears are available.

Shafts are mounted on antifriction bearings and sealed with shields. Details provide lubricant retention and prevent the ingress of dirt into the working tracks. Bearings are mounted in a gearbox housing, made of aluminum alloy. The assembly is detachable, consisting of 2 symmetrical halves that are joined together by screws. A separate gasket or sealant is used to make the joint tight.

The lower gearbox for the grass trimmer is installed on the tool through a seating socket. There are several varieties of the joint, differing in shape.

The most common are round seating with a diameter of 24 or 26 mm.

There are modifications of the tool with a square or polyhedral joint of elements. The torque is transmitted via a slotted connection.

User feedback on lubricants

Specialists advise to use only original materials with characteristics that meet the requirements of the manufacturer. If these are not available, you should clarify what to lubricate the grass trimmer gearbox. Experienced users do not recommend using solidol, because 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 at such parameters in the process of heating the density of the material increases, and the grease itself becomes coarse. In case of an emergency, you can use “Lithol-24” to treat the tool.