What lubricant to use for the grass trimmer gearbox

Gearbox prevention: frequency and order

First of all, prevention is carried out immediately after purchase. This is due to the fact that many manufacturers put in the minimum amount of lubricant, which is only enough for the running-in time.

If the grass trimmer is used at home (the amount of work is small), it will be enough to add lubricant at the beginning and at the end of the season.

lubricant, grass, trimmer, gearbox

In severe operating conditions, the gasoline grass trimmer gearbox must be lubricated every 20-50 hours of operation. Indicators for urgent prevention are increased node noise and overheating. If there is a lack of lubrication, it should be completely replaced.

Manufacturers often produce multifunctional auto chemicals. This means that the lubricant for gasoline gearboxes is also suitable for the treatment of hoses and transmissions of any garden equipment and components that operate under high loads.

Removing and Lubricating the Upper Grass Trimmer Shaft

First of all, we remove the lower part of the rod from the coupling, and then disconnect the coupling from the upper part of the rod (here we are talking about the coupling connecting the two halves of the rod).

grass trimmer PRORAB-8406 with detached coupling and lower part of the boom

Now the most interesting thing: in some videos, like this one, holding the shaft coupling sticking out of the upper part of the rod from below with pliers, they knock it out of the rod with pliers along with the rolling bearing (here we are talking about the coupling connecting the upper and lower shafts). Some petrol cutters with a collapsible bar, as in the video, the coupling connecting the upper and lower shafts is pressed into the rolling bearing.

With our trimmer PRORAB-8406 and others like it, this number will not work. They do not have a rolling bearing, and the coupling (bushing) is an extension of the upper rod shaft. A circlip is installed in the upper part of this shaft, which must first be removed.

The place of attachment of the upper part of the rod to the clutch housing

  • Unscrew the central screw completely. It fixes the top of the bar by partially entering the hole drilled in it. Loosen the side clamping screws and remove the rod from the clutch housing.
  • We push the shaft out of the upper part of the rod towards ourselves, as far as play allows, in order to get to the retaining ring and remove it. A special puller may be needed. Removing the retaining ring.

Retaining ring on the upper shaft of the brushcutter

  • Without the retaining ring, the upper shaft can be easily removed from the rod from the opposite side. We lubricate it, not forgetting about the slots in the bushings (couplings) on the rod shaft and on the clutch shaft.
  • Put the lubricated shaft in place in the upper part of the rod and fix it with a retaining ring. Insert the rod into the hole in the clutch cover and align the hole on the rod with the threaded hole of the fixing screw.
  • Install the retaining screw and secure the top of the grass trimmer bar with the side screws in the clutch cover.
  • We clean the connecting sleeve of the rod from debris and install it from below on the upper part of the rod.

I don’t have a puller, but I use two large paper clips to remove the retaining ring. First, you need to straighten them, on the one hand, make half rings for the fingers, and on the other, bend small hooks.

How to service trimmer head, how to lubricated trimmer head to prevent wear and damage

In many videos, the masters recommend using grease for the CV joints, this is the best option. In its absence, litol-24, which is oriented to temperatures up to 130 ° C, can be used to lubricate the shaft of the lawn mower rod. But grease, which has the worst lubricating properties and operates at temperatures up to 70 ° C, is not recommended to be used.

However, if you urgently need to lubricate the brushcutter bar shaft, and there are no suitable materials, then solid oil or even ordinary engine oil will be better than nothing at all.

How to grease a STIHL gearbox

Checking the correct lubrication of the gearbox angle grinder

The last step in servicing your angle grinder is to check that the lubricant is correctly applied and distributed inside the gearbox. To do this, after the gear unit is assembled, the power tool is turned on without load for a few minutes, while ensuring that there are no extraneous sounds, odors and other things. If they occur, you must immediately disconnect the angle grinder from the mains. The heating of the gear unit is also checked. The lubricant must distribute heat evenly and the temperature of the gear unit must not be too high.

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After a short work, unscrew 4 screws, then remove the cover from the gearbox. Visually inspect the helical gears for grease. If it is absent, then too little lubricant has been loaded and should be reported. If in the process of work it squeezes out of the cracks, then it was laid too much and the excess should be removed. After making any changes, check the operation of the angle grinder again without load.

DIY angle grinder grease

A do-it-yourself angle grinder gear lubricant consists of a base and thinner. The basis of a homemade lubricant is usually a CV joint with molybdenum disulfide or Tsiatim-221. They have a second viscosity according to NLGI, therefore, for use in the gearbox of an angle grinder, the base must be thinned. As a diluent, it is best to use a simple industrial mineral oil, which, for example, is I-20 oil. To obtain a viscosity of NLGI 0, you will need to mix approximately 70 percent base and 30 percent thinner. The resulting mixture is thoroughly mixed and is ready to be applied to gears and bearings of an angle grinder.

Timely maintenance of any electrical tool is the key to its long-term and trouble-free operation. A properly working tool is also a guarantee of safety for the person using it. Using the tips above, everyone can choose the right lubricant for the angle grinder gearbox and replace it without resorting to expensive power tool service centers.

How often do you need to lubricate the lawn mower gearbox??

In most cases, the application of the required portion of oil or its complete replacement is carried out once a year. before the start of the season or at the end of it. This is sufficient if the utility grass trimmer is used for cutting grass about 3-4 days a month.

If the mower is regularly used for mowing young grass in large areas, then the gearbox should be lubricated at least once every 30–45 operating hours. And if a grass trimmer is needed for daily mowing not only of young grass, but also of old tall, woody weeds, then changing the lubricant in its gearbox is required at least once every 20 hours.

The fact that the gearbox of a lawn mower needs lubrication will be prompted by factors such as increased noise and overheating. In this case, it is necessary to remove the mechanism, disassemble it and check the internal parts. If during the inspection it was found that there is enough lubricant in the assembly, then it must be replaced entirely. If there is too little oil, the operator will need to add the missing amount of lubricant.

Grass trimmer lubrication points

For smooth operation and durability of the mechanism, a thorough inspection and maintenance should be carried out. Lubrication of moving parts is important. In most cases, these are:

  • place from the transition from motors to a straight shaft;
  • joint of a straight shaft with a flexible one;
  • transition of a shaft with a landing head;
  • reducer.

Litol-24 multipurpose waterproof grease is popular among users. The operating temperature range is from 40 to 120 degrees. This grease is used in friction units and is effective at elevated temperatures.

The procedure for applying grease to the angle grinder gearbox

The new grease is thoroughly mixed before application and applied in a thin layer. The device of the electric motor of the Tiggo lawn mower. The bearings are lubricated by packing. If the grease is in a plastic tube, then the neck of the tube is pressed against the side bearing cage and squeezed out until it flows out of the back.

What Oil to Lubricate Grass Trimmer Reducer

From time to time, in the midst of a busy mowing job, your grass trimmer will start making nasty, grinding noises. It laments the lack of lubrication reducer. more actively loaded device node. And soon these “warnings” may be followed by a jamming of the drive

How to lubricate the grass trimmer gear

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 from 1.5 to 3 ml of grease into the cavity of the gearbox, depending on the brand of the tool. For ease of dosing, you can use a traditional medical syringe.

During the operation, foreign particles and objects must not be allowed 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 relubricate the unit.

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Grass trimmer gear lubrication: selection criteria was last modified: August 11th, 2018 by Admin

Factors for choosing the lubrication of the brushcutter gearbox

Often, the owner of a particular brand of gasoline grass 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 lawn mower gearbox, you should pay attention to the following factors:

  • 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.
  • 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 the gearbox to be serviced every 20-40 hours of operation.
  • Degree of adhesion to gearbox parts. This figure is characterized by the adhesion of the grease to the metal of the grass trimmer assembly.
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How to properly remove old grease in an angle grinder

Old grease is always removed completely, regardless of its color. There should be no traces of old grease on the parts, and there should be particles of destroyed parts in the cavities of the body.

To remove old grease, you can use various flushing fluids used by motorists to wash the engine and its parts. Electric motor device for a lawn mower. At home, it is recommended to use kerosene or a solution of kerosene and gasoline.

All parts and their cavities must be thoroughly washed and dried.

Gasoline Grass Trimmer Gear Lubricant

Range of lubricants for gardening equipment

Use a special transmission fluid grease to lubricate the bevel gear according to the instructions. As a rule, manufacturers of garden equipment produce and recommend the chemistry of their brand, as the most adapted to their devices.

At the same time, in order to reduce the cost of operating garden equipment and increase the attractiveness of the auto chemistry brand, the lubricant for garden equipment is usually made multifunctional. It is designed not only to lubricate the gearboxes of gasoline trimmers, but also for the treatment of hoses, gears and gearboxes of any garden equipment and mechanical devices operating under high loads.

Or Liqui Moly LM 47 MoS2. CV joint grease with a special antifriction additive. molybdenum disulfide designed for high-speed and loaded bearings.

This gear lubricant is sold in tubes that are easy to use and store.

Even if a specialized gear lubricant is almost completely depleted during operation, additives still create an effective lubricating protective film on the surface of the gears.

It should be noted that many owners of brushcutters in the vastness of the former CIS use ordinary Litol-24 or lithium-based grease for CV joints to lubricate the gearbox. It is convenient to refuel the reducer using a 5-cc medical syringe.

Many motorists, instead of a side screw, pick up the thread and screw the grease gun from the old crosspieces of passenger cars. This modification allows the addition of Lithol without disassembling the assembly using a grease gun.

The undoubted plus of using Litol and lithium-based grease for refueling the brushcutter transmission is a reduction in the cost of operation. But there are nuances due to which spears break on the forums of gardeners of the Internet space. My thoughts on what can be lubricated with lithium-based lubricants and what not can be found in the article “Litol as a lubricant for a brushcutter gearbox“.

Grass trimmer reducer device

Regardless of the manufacturer and model, the modern grass trimmer is equipped with a gearbox to change the angle of mechanical energy transfer between the drive shaft and the line head.

Bevel gears are most widespread 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.

The duralumin housing (1) contains a pinion shaft (2) and a bevel gear (3) pressed onto the driven shaft (4). To reduce frictional forces during rotation, rolling bearings are installed on the bearing points of the shafts (5).

Any gear transmission is a highly loaded mechanism, the duration of operation of which, noiselessness and reliability of which depends primarily on the lubricant.

Therefore, in addition to the main components listed above, the device of the grass trimmer gearbox includes a special hole through which you can lubricate the bearings and gears without disassembling the unit.

It will take

Very few materials and tools are required for lubrication:

  • Disposable syringe 5-20 ml.
  • Brand lubricant recommended by the manufacturer. As an exception, another type of “Litol 24”, “CV joint” or another, designed for lubrication of gearboxes, is suitable.
  • Hex wrench.

Checking the correct lubrication of the gearbox angle grinder

The last step in servicing your angle grinder is to check that the lubricant is correctly applied and distributed inside the gearbox. To do this, after the gear unit is assembled, the power tool is turned on without load for a few minutes, while ensuring that there are no extraneous sounds, odors and other things. If they occur, you must immediately disconnect the angle grinder from the mains. The heating of the gear unit is also checked. The lubricant must distribute heat evenly and the temperature of the gear unit must not be too high.

After a short work, unscrew 4 screws, then remove the cover from the gearbox. Visually inspect the helical gears for grease. If it is absent, then too little lubricant has been loaded and should be reported. If in the process of work it squeezes out of the cracks, then it was laid too much and the excess should be removed. After making any changes, check the operation of the angle grinder again without load.

When to lubricate the grass trimmer gear?

A clear signal about the need to lubricate the drive gearbox is its rapid heating during operation or the appearance of extraneous noise. In this case, lubrication is mandatory.

You should also follow the manufacturer’s recommendations for the petrol or electric trimmer. For lubrication intervals, refer to the operating instructions for the device.

However, even the manufacturer cannot take into account all the nuances and features of the operating modes of these mechanisms, therefore, among the servicemen of electric or brushcutters, there is a fair opinion that the gearbox should be serviced without waiting for signs of malfunction. It is recommended to lubricate the grass trimmer gearbox every 10-15 operating hours (i.e. operating hours).

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You can find advice to lubricate at the end of the season when preserving for winter storage. However, it is best to add new grease to the gearbox before starting seasonal work.

Cases when it is necessary to lubricate include the repair of the unit and any disassembly.

Gearbox lubrication is also required when purchasing a used grass trimmer.

What kind of lubricant to use for the grass trimmer gearbox?

During operation, the mechanical part of the grass trimmer is loaded by contact forces on the teeth, resistance reactions from adhered grass (sometimes with dirt), dynamic, shock loads due to constantly changing torque. The lubricant for the grass 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:

  • Manufacturer’s brand. Each brand reasonably focuses on self-made lubricants (you can talk about cheap Chinese products later). This applies to manufacturers such as Husqvarna, STIHL, Huter, Makita, and others. The exception is domestic grass trimmers: for example, the Caliber in the user manual does not indicate the brand of lubricant at all
  • The viscosity of the lubricant. As you know, all lubricants 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 gearbox parts, as a result of which the grease is not squeezed out into the gaps or out of the unit.
  • Intensity 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 the availability of 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 40 ° C, it is considered that its operating conditions are satisfactory, and there is sufficient lubrication.

It is believed that there is no universal lubricant for the grass trimmer gearbox, but this is not entirely the case. 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 specific grass trimmer model.

Types of gearboxes for brushcutters

The design of the gearbox for the utility grass trimmer consists of a certain number of built-in gears, which, during the operation of the mechanism, rotate at a speed set by the device. Gear drives are designed to decrease or increase the initial speed of a running input shaft. Thus, when the operator pushes the accelerator, the mowing reels or cutting blade rotates faster, and when the lever is released, it rotates more slowly.

Gearboxes used by manufacturers of garden equipment are divided into the following types:

  • cylindrical;
  • wave;
  • worm;
  • planetary type;
  • conical;
  • spiroid;
  • combination mechanisms.

The cylindrical gearbox of the brushcutter consists of several toothed cylinders. They are rarely installed on grass trimmers, since most petrol cutters are equipped with worm gearboxes.

Special attention should be paid to planetary gearboxes. Their built-in shafts are coaxially located in the mechanism. At the same time, the shafts of the bevel gearboxes are in a cross position.

Another type of gearboxes is a reduction gear. Mechanisms of this type are not included in the standard equipment of the brushcutter, however, they are almost always used for making homemade products based on garden trimmers.

Disassembly and replacement of the gearbox

Due to the different gear types, the shape and size of the seat, gearbox interchangeability is rarely possible. Therefore, when purchasing a new part, you should take into account the model of the old unit and the brand of grass trimmer. In the event that you still need to use a non-original device, you must choose it taking into account the following nuances:

  • rod diameter (usually 24.5 or 26 mm);
  • seat shape and diameter (most often 8 mm);
  • protection fixation method.

If the listed parameters are the same, the old gear unit may be replaced with a suitable non-original part. And in order to replace it, you need to remove the gearbox from the rod and disassemble it. To do this, you will need to loosen the tightening bolts located under the structure and remove a pair of corkscrews using round-nose pliers, and then remove the bearings from the driven and drive shafts using a special puller. And to assemble the mechanism, you need to install the removed parts in the reverse order.

Advice! In the absence of a puller, the bearings can be gently knocked out with a hammer and a block of wood. The blows must be applied carefully so as not to damage the seat. However, it is impossible to crank the stuck parts, therefore, to remove them, you need to warm them up with a construction hair dryer (temperature is 600 ° C).

Assembling the gearbox is easier than disassembling. Parts of the structure are set in place with light hammer blows. When the device is assembled, you need to make sure that the driven shaft rotates freely if you move it by hand.