Trimmer Reducer Than Lubricate

Repair and lubrication of the trimmer reducer The device of the trimmer reducer and its possible malfunctions. How to disassemble the gearbox for lubrication? Diy lubrication and replacement algorithm.

Gearbox self-lubrication algorithm

No preliminary disassembly is required to lubricate the transmission. A special hole for these purposes is already embedded in the device (it is shown below). In addition to gears, when lubricating, attention should be paid to the following elements of the mechanism:

  • Bearing unit;
  • Flywheel and starter coil pawl.
Trimmer Reducer Than Lubricate

Lubricant injection hole

Fill in oil or add solid lubricant through a grease nipple closed with a screw. In this case, actions are performed in the following sequence:

  • Clean the gear case from dirt and adhered grass, especially carefully the area around the plug so that debris does not get inside the mechanism;
  • Using the appropriate tool (often it comes with a trimmer), unscrew the plug;
  • Into the open technological hole, the selected lubricant is introduced from a tube, or using a syringe, as shown in the graph below;
  • Screw the plug into place.

Gear lubrication

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

The entire gear lubrication process is demonstrated in the video:

It is required to lubricate the transmission unit at least once a year, but it is recommended to do this every 20 hours of intensive use of the brushcutter. If the first signs of malfunctioning with the mechanism appear, then the lubricant must be applied as soon as possible.

Repair and lubrication of the trimmer gear

With frequent, intensive use of brushcutters, the gearbox may start to warm up or make sounds that are unusual for its normal operation, for example, grinding. This indicates that the mechanism needs to be lubricated. If this is not done in time, then more serious problems will arise (for example, gears will quickly wear out and need to be replaced), up to jamming. Other breakdowns also occur with the transmission. Repair and lubrication of the gearbox can be done independently; for this, you just need to familiarize yourself with the features of these works and stock up on some of the available tools.

Used types of grease

When choosing a lubricant, you must consider the following factors:

  • The degree of adhesion of the composition to the metal of the assembly;
  • Product brand;
  • Consumption of lubricant by the transmission mechanism.

Well-known manufacturers, for example, Stihl, Husqvarna and others, apart from trimmers, also produce lubricants for them. These products not only reduce wear, but also protect the gear metal from corrosion. Therefore, for brushcutters from these brands it is better to use their own lubricants.

Different models have different grease consumption. This is largely determined by the intensity of use of the brushcutter and the heating of the transmission mechanism. The lubricant is considered to be sufficient if the temperature of the gear unit during operation does not exceed 40C.

By consistency, trimmer lubricants can be:

  • Liquid;
  • Semi-liquid;
  • Solid;
  • Plastic.

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

  • Graphite, significantly reducing friction, as a result of which the rotation of the gears improves;
  • Lithium, which is also an excellent anti-corrosion composition, saturated with additives that increase the wear resistance of the metal without harmful substances;
  • Universal components containing highly refined mineral oils and improving performance characteristics.

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

Champion EP-0 universal grease 120 gr

Trimmer Gear Lubrication

Gears must be lubricated regularly in accordance with the recommendations set out in the operating instructions for the model used. This should also be done if:

  • New gears were installed;
  • Atypical sounds emanate from the gearbox during trimmer operation;
  • Knives rotate hard.

With continuous use of the trimmer, the transmission is subject to stress from grass adhering to the blades, dirt or torque changes. The lubricant must be selected of high quality in order to extend the life of the gearbox.

Trimmer reducer device

A trimmer gear is a unit that transmits the rotational motion of the motor shaft to a knife or fishing line. It is located at the lower end of the brushcutter bar. The transfer assembly is also designed to reduce the trimmer engine speed.

The mechanism consists, depending on the model of the brushcutter, of several gears rotating at high speed. As a result, they heat up due to strong friction. If there is not enough lubrication, or there is none at all, then the process leads to severe overheating and failure of parts, and, accordingly, the need to carry out complex repairs. To prevent this from happening, the transmission unit should be lubricated in time. The disassembled gearbox is shown in the graph below.

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Gearboxes of modern trimmers of different models from different manufacturers differ from each other in design and size of the seat. It happens:

  • Round;
  • In the form of an asterisk;
  • Square.

Brush cutters are equipped with gearboxes with different types of gears:

  • Conical;
  • Worm;
  • Spiroid;
  • Cylindrical;
  • Planetary;
  • Wave;
  • Combined.

The drive shaft and gearbox are heavily loaded trimmer assemblies that are subject to significant wear. Between them, the movement is transmitted due to the engagement of the teeth of the gears located at different angles to each other. The gear train works effectively only if there is no mechanical damage. In this case, the mechanism should not overheat, otherwise it may jam.

Basic gearbox malfunctions and ways to eliminate them

Various breakdowns occur with the gearbox of an electric or gasoline trimmer. The most common of them are presented in the table below. There you can also find the causes of their occurrence and methods of elimination.

Gearbox malfunctionPossible causes of failureRemedy
the transfer unit is very hotuse of an unsuitable (low-quality) lubricant or its absenceyou need to replace or add lubricant
the gears are new and not wornfor running-in, run for a short time without heavy loads with regular stops so that the mechanism has time to cool down
jamming of the shaft during rotation, the appearance of backlash and knockingdestruction or significant wear of any of the bearingsreplace the failed bearing with a new one
the transmission mechanism flies off the brushcutter bar or staggersdamage to its bodyit is necessary to replace the part
in some cases, with minor damage with a clamp made of metal, the place is pulled together with a break
not fixed to the pipedocking point wearyou can make a winding from an insulating tape at the attachment point or change the bar
the output shaft with a knife does not rotate or stops in case of an increase in loadwear of teeth on gears or one of themreplacement of the interacting pair of worn parts is required

Bearings are destroyed due to the use of inappropriate lubricant or due to lack of it. Also, their damage is caused by the harsh operating conditions of the brushcutter and the ingress of foreign particles of material (for example, broken metal teeth of mechanical transmissions) due to the fact that the integrity of the anthers is broken.

To remove the bearing, you need to disassemble the gearbox and use a special puller. If not, then you can try to do it with a hammer with a guide. In this case, work should be done carefully so as not to damage the seat. It is not recommended to use the preheating method to shoot the bearing. This is due to the fact that the metal may lose the required performance.

Most gearbox problems can be easily fixed by hand. It is recommended to purchase replacement parts that are native, designed for the used brushcutter model.

Lubricant for trimmer gear. How and how to lubricate?

Occasionally, in the midst of an intense mowing operation, your trimmer will make an unpleasant grinding noise. This complains about the lack of lubrication, the gearbox is the most heavily loaded unit of the device. And soon, these warnings can be followed by a jammed drive.

What kind of lubricant should I use for the trimmer gear?

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

The following factors are taken into account:

  1. Manufacturer’s brand. Each brand reasonably focuses on its own lubricants (you can talk about cheap Chinese products later). This applies to manufacturers such as Husqvarna, Stihl, Huter, Makita, etc. The only exceptions are trimmers of domestic production: for example, the Caliber in the user manual does not indicate the brand of lubricant at all
  2. The viscosity of the lubricant. As you know, all lubricants are divided into three groups of high-viscosity (colloidal systems containing various additives), plastic compounds for universal use and solid lubricants that soften during operation.
  3. Good adhesion to the surface of gearbox parts, as a result of which the grease is not squeezed out into the gaps or out of the unit.
  4. The rate of grease consumption by the gearbox. Here you have to rely on your own experience and the recommendations of specialists, since some trimmer manufacturers, relying on their own service centers, do not give clear recommendations at all regarding the period of operation of the gearbox between two lubrications.

Lubricant consumption also depends on the temperature at which it retains its lubricity. When the gearbox is heated to 40C, it is considered that its operating conditions are satisfactory, and there is sufficient lubrication.

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

  • Lead-free antiwear additives;
  • Solid lubricants with the presence of graphite or molybdenum disulfide (the latter is preferable, since the lubricity is fully retained for a wide range of shaft revolutions);
  • Only mineral (inorganic!) Oils, highly refined.

These requirements are fully met by Gear Grease OREGON or Champion EP-0 lithium greases, domestic compositions Oleo-Mas, Litol.24, or Azmol 158, as well as those recommended by the manufacturer of a particular trimmer model.

How to lubricate the trimmer gearbox?

In the upper part of the body, where the gear block is installed, there is a technological hole, which is plugged with a screw during trimmer operation. This screw is unscrewed, and 1.52 ml of lubricant is injected into the hole using the spout on the tube. If the lubricant was purchased in a different package, then an ordinary disposable medical syringe is also suitable for this operation.

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After that, the screw is installed in its original place. This procedure, regardless of the user’s recommendations, should be performed every 1015 hours of operation of the trimmer in working mode. Other reasons for updating or replacing the gearbox lubricant are the independent performance of minor routine maintenance (for example, cleaning and flushing the gears of the gearbox before the start of the summer season), repairing the unit, preserving the trimmer for the winter, etc.

If the gear unit is disassembled, it is recommended to completely remove the remnants of the old grease from the surface of the parts, even if it does not have any traces of oxidation and contamination. And only then apply new lubricant. After applying the lubricant, it is recommended to rotate the shaft several times by hand and make sure that the lubricant is evenly distributed over all parts of the gearbox.

When lubricating, pay particular attention to the following elements:

  1. Flywheel: as a rule, grass remnants stick to its surface intensively, and thickening grass juice creates additional resistance.
  2. Pawl of the starter coil, which, in the process of turning on the drive, constantly contacts the grooves on the flywheel. In this case, not only mechanical wear occurs, but also mechanochemical corrosion of the flywheel-dog connection, since the materials of this pair are different (the flywheel is aluminum, and the dog is steel).
  3. Bearings, if their seals are worn out, and through them, the remaining grease is squeezed out. In this case, the unit begins to vibrate intensively when loaded. This happens with Chinese-made trimmers, so in the long run it is worth thinking about replacing the bearing assembly with a better one, for example, from the Swedish company SKF.

Trimmer reducer device

Regardless of the manufacturer and model, a modern trimmer is equipped with a gearbox to change the angle of transfer of mechanical energy between the drive shaft and the head with a line. Bevel gears are most widely used in petrol cutters, since unlike spur gears, gears with helical teeth are able to withstand high speeds, have smoother engagement and have increased bearing capacity.

Main parts of the trimmer gearbox

The duralumin housing (1) contains a pinion shaft (2) and a bevel gear (3) pressed onto the driven shaft (4). To reduce the frictional forces during rotation, rolling bearings (5) are installed on the bearing points of the shafts. Any gear transmission is a highly loaded mechanism, the duration of which, noiselessness and reliability of which depends primarily on the lubricant. Therefore, in addition to the main components listed above, the trimmer reducer device includes a special hole through which you can lubricate the bearings and gears without disassembling the unit.

Trimmer Gear Lubrication: Selection Criteria

During the operation of the gasoline trimmer, the gearbox begins to emit grinding sounds, which are a sign of the lack of lubrication, or the loss of its properties. Of course, the owner may not attach much importance to extraneous noise, but ignoring them will lead to jamming of the gears and, as a result, the upcoming expensive repairs. Therefore, in order to avoid the prerequisites for the appearance of a grinding noise, it is necessary to follow the lubrication regulations of the trimmer gear recommended by the manufacturer.

Trimmer gear lubricant: which one to choose?

Choice of reducer paste

Currently, the market for gas powered tools and consumables offers a wide selection of greases that are designed to reduce friction and overheating of rubbing parts. Therefore, each owner, when the time comes for maintenance, is faced with the problem of how to lubricate the trimmer gear for its long-term operation. For these purposes, special plastic pastes are used, which differ in properties and manufacturer.

Lubricant for famous brands of trimmers

Each brand for the manufacture of gasoline trimmers always recommends its own production of lubricant for the gearbox of gasoline trimmers.

  • Husqvarna. This Swedish manufacturer recommends the use of Multi-Purpose Grease Grasa Universal. This material is available in blue-black tubes with a volume of 225 or 250 grams. According to the company, this trimmer gear lubricant has been specially developed for Husqvarna machines, taking into account the steels and working speeds used.
  • Stihl. For Stihl FS series petrol cutters, the manufacturer advises to use Stihl Superlub FS transmission grease, offered in 225 gram tubes or 80 gram disposable containers, silver-orange.
  • Patriot. It is recommended to service the brushcutter gearboxes of this brand with the original Arsenal AR-417 lithium grease. It is specially designed for geared gears operating at high speeds and temperatures.
  • Huter. For the bevel gear of the tool models of this Huter company, you can use any of the above brands of gear lubricants, as well as universal types of Rezoil, CIATIM and others.
  • Champion. In the Champion Brushcutter Owner’s Manual, CHAMPION Super-Lube EP-O is the recommended lubricant. The material is supplied in a 250 gram can or Premium Champion C1104 disposable oiler.
  • Makita. This Japanese manufacturer advises its consumers to use Makita branded lubricant, which comes in 65 ml and 80 ml white tubes with red caps.

Factors for choosing the lubrication of the brushcutter gearbox

Often, the owner of a particular brand of gasoline trimmer is not able, for some reason, to purchase a lubricant recommended by the manufacturer. In such cases, it will be necessary to search for an analogue, which in its properties will be identical to the branded paste. Therefore, when choosing a paste for a petrol cutter gearbox, you should pay attention to the following factors:

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Lubrication of the gas cutter gearbox

  1. The viscosity of the lubricant. All pastes on the market are divided into three main groups, namely: high-viscosity (contain additives), solid lubricants (soften during operation of the unit) and universal plastic compounds.
  2. The rate of grease consumption. This factor is taken into account based on the personal experience of the owner, and is characterized by the period between two lubrications. Most manufacturers require a gearbox to be serviced every 20-40 hours of operation.
  3. Degree of adhesion to gearbox parts. This indicator is characterized by the adhesion of the grease to the metal trimmer assembly.

How to lubricate the trimmer gear

Disassembled gearbox for petrol cutters

Almost every brushcutter gearbox is equipped with a small technological hole, which is plugged with a special bolt during operation. After thoroughly cleaning the unit from grass residues and debris, it is necessary to unscrew the screw and inject 1.5 to 3 ml of grease into the gearbox cavity, depending on the brand of the tool. For ease of dosing, you can use a traditional medical syringe. During the operation, do not allow foreign particles and objects to enter the gearbox, as this can lead to intense wear of the gear train, as well as its jamming.

Experts recommend that at the end of the mowing season and long-term storage of the tool without work, disassemble the gearbox, flush the gears and bearings, and re-lubricate the unit.

Lower and upper gear lubrication

There are tips that recommend lubrication at the end of the season. However, most people find it best to do this at the beginning of each season. When we repair a unit, as well as carry out any disassembly, it is necessary to use lubricants. The gearbox must be additionally lubricated when the old trimmer is inserted.

Modern trimmers are equipped with a gearbox that measures the angle of transmission of mechanical energy between two components: the shaft and the head. Bevel gears are considered common, they can easily withstand high speeds, are equipped with smooth engagement, as well as an increased level of bearing capacity. The housing includes a shaft, a gear wheel, which is pressed onto the driven shaft. In order to reduce friction, bearings are installed on the bearing points of the shaft.

How and how to lubricate the gas cutter gearbox?

Responsible maintenance is the key to long tool life. One of the requirements in the work of a petrol cutter is the timely lubrication of the gearbox, as well as cleaning the filters. Every user of such a unit knows what composition to lubricate the gearbox with. First, it is cleaned in several stages, then the element is removed from the casing. It is cleaned with gasoline and dried. The place for the filter is prepared thoroughly, cleaning it from dust and old oil. The main signal for lubrication of the petrol cutter gearbox is extraneous noise and rapid heating of the equipment. This means that it is necessary to lubricate the spare part as soon as possible. The lubrication frequency is specified in the instructions for the brushcutter. The experts say that gearbox maintenance should be done every 15 hours.

Petrol trimmer grease

Correctly selected brushcutter care guarantees the durability and quality of the equipment. Manufacturers try to take into account all the nuances and prescribe what materials to use for maintenance. Usually, a specific type of lubricant is not specified, it is simply given generally known standards that lubricants must comply with.

The lubricant must be selected in such a way as to take into account temperature conditions, rotational speed, load dynamics and vibration. The main requirement is that this mixture remains in the zone of maximum friction.

Based on the above information, it should be noted that manufacturers of petrol cutters are developing universal additional tools for their equipment. It can be served with general industrial compounds. The main condition is compliance with the operating conditions, namely, the presence in the composition of a substance against rust and lime, as well as a filler, which consists of a solid lubricant. Grease is poured into the gearbox through a special hole, the unit is not dismantled.

Replacement is done quickly enough.

  1. First, turn off the device from the network. Devices running on gasoline must be drained of gasoline.
  2. If the lubricant changes completely, then be sure to flush the gearbox. To do this, first fill in the cleaner, then rinse the gearbox well, then drain. It is important to clean the entire case.
  3. Use the special tool that comes with the trimmer to unscrew the gearbox plug.
  4. Apply new grease: insert a syringe with a tube into the hole and squeeze out the grease (2-5 ml).
  5. We turn the shaft manually, turn on the scythe at low speed without load. This is necessary in order for the lubricant to be efficiently distributed in places subject to maximum friction.

Prevention and possible malfunctions of the gearbox

The brushcutter requires first maintenance immediately after purchase, because the manufacturer puts in a small amount of lubricant. If the trimmer does a small amount of work, then lubricate the device at the beginning and end of the season. If the brushcutter works a lot, then we lubricate it after 30-55 hours of operation.

The main malfunctions include the most common options.

  • Strong heat. This indicates that the lubrication has run out. It is necessary to add lubricants and run them in a low mode.
  • Gearbox vibrates or wobbles. This situation indicates mechanical damage.
  • There is a knock. Then the bearing collapsed, the boot was damaged.
  • If the trimmer blade is jammed, then the mechanism should be changed completely.