To completely disassemble the brushcutter gearbox to remove wear and replace the lubricant
How to grease a brushcutter gearbox repair? Whatever model of brushcutter, the second most important assembly after the engine is the reduction unit that consists of two helical gears, the smaller of which is the drive gear and the larger the driven one.
Gearing that rotates in the bearings is housed in a housing that consists of two symmetrical halves and is bolted together. The drive pinion receives rotation from the engine through the rod, which ends in splines (usually 7 or 9), driven pinion transmits the rotation to the spindle, which serves for mounting the working body. a drum with a fishing line, ropes or cutting disc. The pinion bearings on the spindle side are sealed with an oil seal that protects the bearings and the lubricant therein from contamination. There is a bolt on the housing for its replenishment, which can be used to add grease while the tool is in operation.
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 a 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 all the meshing, lubrication can delay the repair of this important unit and prolong the service life of several times.
Disassembling gearbox to check it and replace grease and wear particles
To do this, disconnect the housing 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. Remove the plug bolt, but it can be left in place because it is not under any tension. к. it does not have any load bearing capacity.
Then remove the drive pinion from the housing. To do this, use a special puller to remove the locking ring from the ring slot, which holds in position in the housing block of the drive pinion.
Since the bearings are mounted with the outer ring interlocking in the housing, it is not easy to remove them. To make the task easier, heat the gearbox housing in the bearing area with a construction hair dryer.
Once the metal of the housing heats up, it will expand and the interference will disappear. Now you can easily remove the helical drive pinion assembly with two identical paired bearings from the housing.
Proceed to remove the idler pinion assembly with the spindle from the gear housing. Here, first remove the centering bush with a pair of pliers with narrow jaws and then the stuffing box by prying it out with a screwdriver or other suitable tools.
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.
Warm up the gear housing in the area of pinion bearing block and after a while pull it by slightly pulling the spindle.
How to lubricate the gearbox of a brushcutter with a simple method
How to correctly lubricate the gearbox of a brushcutter? Many trimmer users do not attach importance to overheating of the gearbox of the mowing head. And of course, when it breaks down they immediately run to a repair shop. To save time and money on repairs, it’s enough to lubricate the gearbox before the season starts and forget about extra costs.Gearbox. It is one of the most loaded parts in this device and breaks down quite often. That’s why it definitely needs periodical maintenance.
You’ll need
Take a syringe and temporarily remove the piston. Put grease in the cylinder. It usually amounts to 5-10 grams (for exact amounts see your brushcutter’s manual).
Don’t be lazy to spend a few minutes after buying your brushcutter and before the mowing season to grease this important assembly. And your tool will always be ready to work at any time and will serve you for many, many years.
How to lubricate the gearbox of grass trimmer or brushcutter: proper maintenance of garden tools | (Photo Video)
Many trimmer users neglect maintenance of their tools. In particular, this applies to such a trimmer assembly as the gearbox. Gearbox work involves heat.
Continuous use of brushcutters causes the gearbox to overheat regularly, which can lead to malfunctions. Gearbox failures make the tool unserviceable and need to be repaired.
Gearbox repair is a costly affair, so it’s a good idea not to let the tool get so badly damaged. The main reason of gearbox overheating and its failure is the lack of lubrication in it.
The article describes how to properly lubricate the gearbox of the grass trimmer to avoid its breakdown.
Tools and materials required
The following tools and materials will be needed for gearbox maintenance:
Hexagonal wrench for opening the lubrication hole of the gearbox
This kind of wrench is usually supplied with your brushcutter or trimmer.
The next tool is a standard 10 ml syringe. It is the syringe that gets the grease into the gearbox.
It is advisable to use a brand-name lubricant 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’s easy enough to do. use a hexagon wrench to unscrew the gearbox bolt. All brushcutters have this bolt in the same place, near the tool.
Action: Fill grease gun with oil
Diameter of grease tube does not match that of gearbox
To easily add grease to the gearbox, use a grease gun.
Then grease is squeezed out of the grease gun and pushed into the grease nipple.
The piston is then inserted back into the syringe. Syringe is ready to add grease to the Geareducer.
Action Filling the Geareducer with Grease
A syringe is inserted into the reducer hole
First insert the grease gun into the reducer bore.
Squeeze a little grease into the gearbox and turn it about a quarter turn
Then squirt some grease into the gearbox and turn it about a quarter of a turn.
Once all grease has been squeezed out, you can consider the process complete
Use only small amounts of grease. After each grease squeeze, turn the reducer by 1/3 to 1/4 turn. It is advisable to choose the amount of grease you want to use for each filling so that the gearbox makes a full revolution during lubrication.
Procedure Sealing the gearbox
After the reducer is filled with grease, tighten the bolt on the reducer and clamp it well.
How to grease the gearbox of a brushcutter (easiest way)
How to lubricate the gearbox of grass trimmer or brushcutter: proper maintenance of garden tools | (Photo Video)
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How to lubricate the gear reducer grass trimmer?
In the upper part of the body, where the gear assembly is installed, there is a technological hole that is plugged with a screw during the operation of the grass trimmer. This screw is unscrewed and 1.5 2 ml of grease is injected into the hole using the nozzle on the tube. If the grease was purchased in a different packing, the operation can be performed with an ordinary disposable medical syringe.
Then reinsert the screw in its original position. This procedure, regardless of the user’s recommendations, should be performed every 10 to 15 hours of operation of the grass trimmer in working mode. Other reasons to refresh or replace the gearbox lubricant are to carry out minor maintenance routines by yourself (e.g. cleaning and flushing the gears before the summer season), to repair the unit, to preserve the grass trimmer for the winter, etc. д.
If a gear unit has been disassembled, it is recommended that the old lubricant be completely removed from the surfaces of the parts, even if there are no signs of oxidation or contamination. Apply new grease only afterwards. After the lubricant has been applied, it is recommended that the shaft be turned several times by hand to make sure that the lubricant is evenly distributed throughout the gearbox parts.
When lubricating, pay particular attention to the following elements:
- the flywheel: there is usually a lot of grass residue on its surface and the thickening grass sap creates additional resistance.
- The dog of the starter coil, which during start-up is in constant contact with the slots on the flywheel. This not only causes mechanical wear but also mechanical and chemical corrosion of the flywheel/hand wheel coupling since these couples have different materials (flywheel is aluminum and hand wheel is steel).
- When the bearings are worn and the seals are squeezed out, the grease is pressed out. In this case, the unit starts to vibrate intensively when loaded. It happens with trimmers made in China, so in the long term it is worth thinking about replacing the bearing unit for a better quality, for example, from the Swedish company SKF.
Major transmission malfunctions and solutions
Various failures occur with the transmission of an electric or gas grass trimmer. The most common ones are shown in the table below. There you can find the causes and remedies.
| Malfunction of gearbox | Possible causes of failure | Protective equipment |
| the gear is very hot | Use of unsuitable (low-quality) oil or lack of oil | You need to change or add oil |
| The transmission is new and not used for | Work for a short time without great load, with regular stops so that the mechanism has time to cool down | |
| jamming of the shaft when rotating, appearance of play and knocking | failure or considerable wear of any of the bearings | replace the faulty bearing with a new one |
| the gear mechanism bounces off the hedge trimmer rod or wobbles | damage to its body | part must be replaced |
| in some cases minor damage by metal clamping increases the fault | ||
| not attached to the tube | oil | it is possible to wrap it with duct tape or change the bar |
| output shaft with blade does not rotate and does not stop in case of increased load | wear of the gear teeth or one of them | the interacting pair of worn parts must be replaced |
Bearings deteriorate due to the use of unsuitable oil or lack thereof. They also cause damage. Difficult operating conditions mowing and penetration of foreign material particles (such as broken metal teeth of mechanical gears) due to the fact that the integrity of the dust collectors.
To remove a bearing, you need to disassemble the gearbox and use a special puller. If not, you can try to do so with a tipped hammer. In this case work carefully so as not to damage the seat. Do not use the preheat method to photograph bearings. This is due to the fact that the metal can lose the necessary performance characteristics.
Most transmission problems are easy to solve on your own. It is recommended to buy spare parts “native”, designed for the mower model used.
Major transmission failures and their solutions
Various failures occur with the gearbox of an electric or gas grass trimmer. The table below shows the most common ones. There you can find the causes and remedy methods.
| Transmission malfunction | Possible causes of failure | Protective equipment |
| gear is very hot | use of unsuitable (low-quality) oil or its absence | you need to replace or add oil |
| new gear and is not used for | work for a short time without heavy loads with regular stops to allow the mechanism time to cool down | |
| the shaft jams when turning, play and knocking | failure or considerable wear of any of the bearings | replace the faulty bearing with a new one |
| the gear mechanism bounces off the hedge trimmer stem or wobbles | its body is damaged | part must be replaced |
| in some cases, when minor damage is done by a metal clamp, they will intensify the malfunction | ||
| is not attached to the pipe | oil | a wrap of duct tape can be made at the attachment point or the bar can be changed |
| the output shaft with the blade does not rotate and does not stop when the load is increased | wear on the gear teeth or one of the gears | the interacting pair of worn-out parts needs to be replaced |
Bearings deteriorate due to the use of unsuitable oil or lack of it. They also cause damage. Difficult operating conditions mowing and penetration of foreign material particles (e.g., broken metal gears of mechanical gears) due to the fact that the integrity of the dust covers is compromised.
To remove a bearing, you need to disassemble the gearbox and use a special puller. If not, you can try to do so with a tipped hammer. In this case, work carefully so as not to damage the seat. It is not recommended to use the preheat method for photographing bearings. Due to the fact that metal can lose the necessary performance characteristics.
Most gearbox problems can be solved easily by yourself. It is advisable to buy “genuine” spare parts that are designed for the mower model you are using.
How to Lubricate Grass Trimmer Shaft Video
Grass trimmer gearbox lubricant. 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 following lawnmower video will tell you about how to lubricate your grass trimmer’s disc shaft. This complains about the lack of lubrication gearbox. the most heavily loaded unit of the device. And these “warnings” can soon be followed by a jammed drive.
What lubricant to use for the gearbox of your grass trimmer?
During operation, the mechanical part of the grass trimmer is loaded with contact forces on the teeth, resistance reactions from grass clinging (sometimes. with dirt), dynamic, shock loads due to constantly changing torque. Gear lubricant for grass trimmer 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 brand. Repair of grass trimmer Champion t 336 with your own hands lawnmower how to lubricate the shaft pcs video. Example. Each brand is not unreasonably focused on lubricants of its own making (we can talk about cheap Chinese products later). This includes manufacturers such as Husqvarna, STIHL, Huter, Makita, etc. The exception is domestic-made grass trimmers: for example, Kalibr in the user’s manual does not indicate the brand of lubricant at all.
- Viscosity of grease. As it is known, all lubricating compositions are divided into three groups. high-viscosity (colloidal systems containing various additives), plastic compounds for universal use and solid lubricants, which soften during operation.
- Good adhesion to the surface of the gearbox parts, which prevents grease from being squeezed out into the gaps or out of the unit.
- Intensity of grease consumption by the gearbox. Here we have to rely on our own experience and recommendations of specialists, because some trimmer manufacturers, trusting in their own service centers, do not give any clear recommendations concerning the period of operation between two lubrications.
Lubricant consumption also depends on the temperature at which the lubricant retains its lubricating power. When the gearbox is heated up to 40°C, the operating conditions are considered satisfactory and lubrication is sufficient.
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It is believed that there is no universal lubricant for the grass trimmer gearbox, but this is not entirely true. In fact, the appropriate lubricant composition will be the one that contains the following components:
- Antiwear additives, which do not contain toxic lead;
- Solid greases with the presence of graphite or molybdenum disulfide (the latter is preferable, since this way the lubricating ability is fully retained for a large range of shaft revolutions);
- Mineral only (inorganic!) oils 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 housing where the gear unit is installed, which is plugged with a screw during the operation of the grass trimmer. This screw is unscrewed and 1.5 to 2 ml of grease is injected into the hole using the nozzle on the tube. If grease has been purchased in a different packing, an ordinary disposable medical syringe is also suitable for this operation.
After that, the screw is installed in its original place. This procedure, regardless of user recommendations, should be performed every 1015 hours of operation of the grass trimmer in working mode. Who cares?Watch this video to see how to lubricate the shaft. Other reasons to refresh or change gear lubrication are self-cleaning of small routine maintenance operations (e.g., cleaning and washing gear wheels before the summer season), repairing of the unit, preserving the grass trimmer for winter, etc. д.
If the gear unit is disassembled, it is recommended to completely remove the remains of the old grease from the surface of the parts, even if it has no traces of oxidation and contamination. And only then apply new grease. After the application of the lubricant it is recommended to turn the shaft a few times by hand and make sure that the grease is evenly distributed on all parts of the gearbox.
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 gear mechanism with gears is lubricated after ten hours of operation or in case of gearbox overheating. This is determined by a simple touch of the hand to the body of the product. The main thing is to choose the right trimmer for the grass. If large lawn care is required, a professional model with a larger gearbox is better suited.
Gearbox is used to actuate the rotating mechanism and “make” it work. Its design can be different, depending on the purpose of the tool.
With the help of these devices the mechanism of brushcutters is also driven. On the market you can reduce or increase the speed reducer for different types of grass trimmer.
Popular are two- and three-stage models of twin or unfolded circuits, which are resistant to loads and have a high level of efficiency.
- Worm. The compact tool is the most common type. Increased torque, simple construction. The worm model is quiet, but still produces a high output. Self-locking function is a special feature.
- Globoidal worm. It has a slightly convex shape and features high drive power and increased torque.
- Cylindrical. Cylindrical gears, varied design, high power. Service life is from 25 thousand. hours.
- Conical. The design uses wheels with a circular, straight toothed wheel. It is characterized by high endurance of operation and simplicity of design.
- Conical-cylindrical. Designed for large equipment only. Has a low loading capacity.
- Attachment. It is mounted on the output shaft, without additional gears, connections. The model is compact and lightweight.
- Planetary. One of the most powerful tools, which has a complicated design. Mainly used in mechanical engineering.
Gearboxes for brushcutters are generally of the screw type. It ensures the trimmer’s high quality operation.
The process of lubricating gears
When lubricating the gearbox, located in the upper part of the trimmer for grass with grease or thick grease, remove the housing cover and only then apply grease to its gears. But before that, the used lubricant is removed.
Variety of lubricating compounds
Greases of different consistencies are used for the care of gear units:
- Semi-liquid. These formulas contain a variety of additives and chemicals.
- Plastic. Are the most versatile option. Most commonly used for gear and helical gears.
- Solid. Plate slurry in its original condition.
Special gear lubricant belongs to the semi-liquid system.
STIHL grass trimmer grease is popular. Thanks to its special composition and components, it significantly reduces wear and increases resistance to corrosion. The main properties of this brand of grease are:
STIHL lubricant is suitable for brushcutters and trimmers and all transmissions with closed housing.
Servicing a petrol grass trimmer
Most brushcutters and trimmers have a flexible shaft in their design. Its condition should be checked at least once every 50 operating hours. To perform this operation, you must remove the boom tip, pull out the shaft and inspect it, then lubricate.
Inexpensive materials are suitable for shaft care, harder to select for grass trimmer gearbox. What to grease this mechanism with. depends on the company-manufacturer of the tool. It is best to use materials that contain molybdenum disulfide. The latter provides smoothing and filling of 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. The following is important: Use of excessive amounts of lubricant leads to overheating of the gearing, increased friction and higher fuel consumption.
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 what to lubricate the gearbox of the grass trimmer. 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. This material also has no anti-wear properties.
The working temperature range of solidol is from minus 40 to 65 degrees, but even at such parameters during heating the density of the material increases and the grease itself becomes coarse. If there is an urgent need to treat the tool, you can use “Lithol-24”.
Maintenance of gasoline grass trimmer
Most brushcutters and trimmers have a flexible shaft in their design. Its condition must be checked at least once every 50 operating hours. To perform this operation, you must 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 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 of cracks on the work surface, so it is especially valued among users.
Important: Using too much grease and too high a density leads to overheating of the machine, increased friction on the working couples and increased fuel consumption. The selection of materials and preventive measures must therefore be handled responsibly.