DIY trimmer bevel gear repair

In detail: do-it-yourself repair of an angle trimmer gear from a real master for the site my.housecope.com.

Trimmer reducer (petrol cutter gearbox, brushcutter gearbox) is a mechanical device located at the bottom of the trimmer (petrol cutters or brushcutters) and designed to transmit torque from the engine to the cutting equipment at an angle of 30 °, ensuring the operation of the cutting equipment in a horizontal plane (parallel to the ground surface) , as well as reducing the angular speed and increasing the torque of the output shaft in a ratio of 1: 1.40 (for example, if the engine operates at 12 thousand rpm, then the knife will rotate at a speed of 8.6 thousand rpm).

Malfunction - the trimmer gear is very hot.
The malfunction of the petrol cutter gearbox and the brushcutter gearbox is the same as that of the trimmer.
Causes malfunctions - lack of lubrication in the gearbox, improper lubrication or lack of rolling of the new gearbox (when the parts have not yet been worn down).
Repair do-it-yourself trimmer - add grease to the trimmer gearbox, change the grease or run the trimmer in a gentle mode (use up three fuel tanks under light loads and with periodic stops for free cooling). PrivatBank in Kremenchug.
Malfunction trimmer - knocking, backlash and sticking when the trimmer gearbox shaft, brushcutter gearbox or petrol cutter gearbox rotates.
Causes malfunctions - destruction of one of the bearings in the trimmer gearbox due to lack of lubrication in the gearbox, inappropriate lubrication, severe operating conditions of the trimmer, damage to the anthers on the bearings during their installation.
Repair do-it-yourself trimmer - order the bearings from the dealer and replace them (there are two or three closed bearings) - for more details see below "How to disassemble the trimmer gearbox / petrol cutter gearbox / brushcutter gearbox".
Malfunction trimmer - the reducer wobbles or flies off the trimmer pipe.
Causes malfunctions - mechanical damage to the gearbox housing - for example, if a piece of the housing breaks off with a strong knife hit against heavy metal or stone (or if the gearbox housing is damaged, for example, with a hammer during repairs).
Repair trimmer with your own hands - replace the gear case. Or, if a small piece breaks off, make a metal clamp that tightens the break.
Do-it-yourself repair of a petrol cutter is similar to repairing a trimmer.
Malfunction trimmer - the reducer is not clamped on the pipe. As practice shows, the gearbox does not fly off the pipe at all, but theoretically it can fly off the pipe along with the rotating knife.
The malfunction of the brushcutter is similar to the trimmer.
Causes trimmer malfunctions - wear of the gearbox seat on the pipe (the aluminum of the pipe under the gearbox is worn out).
Repair do-it-yourself trimmer - roll up the cloth tape on the pipe under the gearbox or replace the pipe.
Malfunction trimmer - the trimmer knife has completely stopped rotating (with a characteristic metallic sound) or stops rotating under high loads (with a hard gnawing sound).
Causes malfunctions - wear of the teeth on the bevel gear in the trimmer gear.
Repair do-it-yourself trimmer - replace the pairs of bevel gears (the pair is replaced) in the gearbox - for more details, see below "How to disassemble the trimmer gearbox / petrol cutter gearbox / brushcutter gearbox".

Video (click to play).

In order to disassemble the trimmer gear, it is necessary.

Remove the gearbox from the pipe by loosening the two tie bolts under the gearbox.
Wash the gearbox with a brush, for example, in petrol without oil and dry it.
Using round nose pliers, bring the ends of the retaining ring together and remove it.
Remove the second circlip in the same way.
Then it is necessary to strongly heat the housing of the trimmer gearbox, brushcutter gearbox or petrol cutter gearbox with an industrial (technical) hairdryer at an outlet air temperature of 600 ° C.
Then, with strong blows of a wooden block on the upper part of the gearbox housing, knock out the driven shaft with the bearing and gear (first you should try to knock out the bearings without heating). You only need to hit with a wooden block, since a metal hammer, for example, can break the body.
In the same way, we remove the drive shaft with the bearing and the gear (we strongly heat the place where the bearings sit and by striking a wooden block on the housing coaxially with the shaft, knock out the shaft with two bearings and a gear). How to disassemble a trimmer reducer, a petrol cutter reducer and a brushcutter reducer. In order not to heat up, you can try using a camera.

Assembling the trimmer gearbox is performed in the reverse order of disassembly (assembly after purchase and replacement of faulty spare parts). Assembling the gearbox is much easier than disassembling - everything is literally assembled with your fingers. Sometimes you need to lightly tap something, install the circlip and check if the driven shaft is turning by hand.

If you decide replace the trimmer gear not original, then in a new gearbox you should pay attention to the diameter of the pipe for which the gearbox is intended (usually 25.4 mm or 26 mm), the diameter of the drive shaft (usually 8 mm), the size of the square of the drive shaft (usually 5 mm or a star on 9 teeth) and fastening the protection to the gearbox, as well as to the nut (with left-hand thread, usually M10x1.25).

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Don't buy champion trimmers full of Chinese shit, throw them in the trash, and the Chinese suck. That's fucking so good.

I have a champion trimmer t 541 for 10 years. In a year, he mows hay for 2 cows, plus (at home 1 hectare of land) weeds and weeds. I saw everything. Super. Perhaps they did better before

and I use my trimmer to harvest firewood in the planting - it freely knocks down and then chops the trees!

don't write nonsense
in 2011, the champion bought t336 for 5200r, 32.6 cubic meters, trouble-free equipment, for all the time I changed only the candle after 4 seasons for prevention, the old one was working. All summer at work, mowing huge volumes of grass, mowing everything, oats, potato tops. Fuel consumption is scanty, I lubricate the trimmer reducer with lithol. Against the background of the rest of China, even of greater volume, just a song. of course the piston has already begun to creep, on the trail. I plan to buy a more powerful champion for the season, as well as the best equipment for its price, I don't see any reason to overpay twice for calm

Read also: DIY electrolux repair

Champion T334 purchased in 2009. Kosh, of course, only with a fishing line, from a knife it vibrates too much. As they say, it starts with half a turn. After the winter, you fill in gasoline and oil, the damper, suck in the gasoline and .... go ahead. He laid weeds with a height of one and a half meters, of course, several times. And in 2016 I learned that it was necessary to lubricate the gearbox ... because the teeth were worn out :) New in Teply Stan - 1000 rubles. And back to work. So with my trimer, I was definitely lucky.

I also have a champion t 226 fishing line herachit everything starts up almost immediately 2 seasons 10-12 refueling already the flight is normal) assembled soundly

It's clear how to fix it, but where to buy a conical pair?

With frequent, intensive use of brushcutters, the gearbox may start to warm up or make sounds unusual for its normal operation, for example, grinding. This indicates that the mechanism needs to be lubricated. If this is not done on 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. You can repair and lubricate the gearbox yourself - for this you just need to familiarize yourself with the features of these works and stock up on some of the available tools.

A trimmer gear is a unit that transmits the rotational motion of the motor shaft to a knife or 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 photo below.

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

The most common round seat diameters are 24, 25.5 and 26 mm.

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. Effectively gear works only if there is no mechanical damage. In this case, the mechanism should not overheat, otherwise it may jam.

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.

Bearings are destroyed due to the use of inappropriate lubricant or due to lack of it. Also, their damage is caused by harsh operating conditions brushcutters 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 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.

If the knife stops rotating under load or does not stop at all, then this is accompanied by an uncharacteristic sound.

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

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

new gears were installed;
atypical sounds emanate from the gearbox during trimmer operation;
knives turn hard.

In addition to the gearbox, the trimmer shaft must also be lubricated regularly. This is the norm for proper care of the device.

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

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;
the consumption of lubricant by the transmission mechanism.

Well-known manufacturers such as, Stihl, Husqvarna and others, in addition to trimmers, also produce grease 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 lubricating products.

If the compound used for lubrication has good adhesion, then it practically does not squeeze out of the gearbox through the gaps.

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 40 ° C.

By consistency, trimmer lubricants can be:

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 is improved;
lithium, which are also an excellent anti-corrosion composition, saturated with additives that increase the wear resistance of the metal without harmful substances;
universalcontaining highly refined mineral oils and components that improve performance.

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

To lubricate the transmission mechanism, its preliminary no disassembly needed... A special hole for these purposes is already embedded in the device (it is shown in the photo below). In addition to gears, when carrying out lubrication, attention should be paid to the following elements of the mechanism:

bearing unit;
flywheel and starter coil pawl.

Grease injection hole

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

clean the gear housing 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 injected from a tube, or using a syringe, as shown in the photo below;
screw the plug into place.

Gear lubrication

When applying lubricant, you need to rotate the knife so that it is evenly distributed over the teeth of the moving gears.

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 whole 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 malfunctions with the mechanism appear, then the lubricant must be added as soon as possible.

To replace the gearbox with a similar part from the same manufacturer, it must first be disassembled and removed from the rod. In this case, they act according to the following algorithm:

loosen the tie bolts located under the transmission;
using round nose pliers, remove two corkscrew rings;
using a puller, pull the bearings from the driven and drive shafts;
then the mechanism is assembled, installing all the parts in reverse order.

Disassembled transmission mechanism is shown in the photo below.

If the puller is not at hand, then you can try it carefully knock down the bearings... When they have become attached and do not budge at all, you can heat them up with an industrial hair dryer (at a temperature of 600 ° C) and remove them.

Assembling the transfer assembly is easier than disassembling it. You may only need to tap lightly with a hammer to set the parts in place. After assembly, it is imperative to check that the driven shaft can be turned by hand.

When there is a need to replace the transfer unit with a non-original part, then it should be taken into account their interchangeability... It should be borne in mind:

rod diameter (this parameter is often 25.4 or 26 mm);
parameters of the drive shaft - the shape of the docking place and the diameter (its common value is 8 mm);
option for securing protection.

If the considered parameters match, then it will be possible to install a part from other models.

Timely lubrication of the gearbox will ensure its long-term operation without repairs. In addition, modern materials protect the metal well from corrosion and increase its wear resistance. When choosing, preference should be given to the lubricant recommended by the manufacturer of the trimmer being operated. If it is not possible to acquire such compositions, then the considered or other analogs suitable in terms of properties should be used. When it is necessary to disassemble the mechanism during repairs, this should be done carefully so as not to damage individual parts.

The repair and service of the trimmer gearbox, petrol cutter gearbox, brushcutter gearbox are thoroughly described.

Trimmer reducer (petrol cutter gearbox, brushcutter gearbox) is a mechanical device located at the bottom of the trimmer (petrol cutters or brushcutters) and designed to transmit torque from the motor to the cutting equipment at an angle of 30 °, ensuring the operation of the cutting equipment in a horizontal plane (parallel to the ground surface) , also reducing the angular speed and increasing the torque of the output shaft in a ratio of 1: 1.40 (for example, if the engine runs at 12 thousand rpm, then the knife will rotate at a speed of 8.6 thousand rpm).

The malfunction of the petrol cutter gearbox and the brushcutter gearbox is the same as that of the trimmer.

Causes malfunctions lack of lubrication in the gearbox, unsuitable lubrication, or the new gearbox is not rolling (when the parts have not yet been worn down).

Repair do-it-yourself trimmer, add grease to the trimmer gearbox, change the grease or run the trimmer in a gentle mode (develop three fuel tanks under low loads and with repeated stops for natural cooling).

Malfunction trimmer knocking, free play and sticking when the trimmer gearbox shaft, brushcutter gearbox or petrol cutter gearbox rotates.

Causes malfunctions destruction of 1 of the bearings in the trimmer gearbox due to lack of lubrication in the gearbox, inadequate lubrication, strict criteria for trimmer operation, damage to the anthers on the bearings during their installation.

Repair trimmer with your own hands, order bearings from a dealer and change them (there are two or three closed bearings) - see details below & How to disassemble the trimmer gear / petrol cutter reducer / brushcutter gearbox &.

Malfunction trimmer, the reducer staggers or flies off the trimmer pipe.

Causes malfunctions - mechanical damage to the gearbox housing - for example, if a piece of the housing breaks off when a knife hits a heavy metal or stone (or if the gearbox housing is destroyed, for example, with a hammer during repair).

Repair do-it-yourself trimmer to change the gearbox housing. Adjusting the carburetor mowers video. Or, if a small piece breaks off, make an iron clamp tightening the place of the break.

Do-it-yourself repair of petrol cutters is similar to repairing a trimmer.

Malfunction trimmer, the reducer is not clamped on the pipe.Echo trimmer gear heats up. Carburetor for petrol cutters adjustment. As practice indicates, the gearbox does not completely fly off the pipe, but at a theoretical level it can fly off the pipe together with a rotating knife.

A petrol cutter malfunction is similar to a trimmer.

Causes trimmer malfunctions wear of the gearbox seat on the pipe (the aluminum of the pipe under the gearbox is worn out).

Repair trimmer with your own hands, wind up the cloth tape on the pipe under reducer or change the pipe.

Malfunction trimmer, the trimmer knife has completely finished spinning (with a corresponding iron sound) or stops spinning under heavy loads (with a hard gnawing sound).

Causes faults wear of teeth on the bevel gear in the trimmer gear.

Repair do-it-yourself trimmer to change pairs of bevel gears (a pair is replaced) in the gearbox - see details below & How disassemble trimmer reducer / petrol cutter reducer / brushcutter reducer &.

Disassembly and repair top gear brush cutters (trimmer) Online store of spare parts for garden equipment.

Lubricants for trimmer gearboxes, the types of which depend on their consistency, allow to provide the necessary maintenance of the equipment:

Semi-fluid lubricants are characterized by the presence of a colloidal system containing various additives and additives. The grease is suitable for both helical and gear drives and is therefore a versatile option. The initial state of solid suspensions is plastic.

Lubrication of the petrol cutter gearbox is provided with a special compound specifically for gearboxes. Most lubricants are in the form of semi-fluid systems. When choosing the required lubricant, it is required to take into account the temperature regime for which the mixture is intended.

The petrol trimmer can work efficiently in all weather conditions. Electric models of petrol cutters are not able to meet the requirements of owners of household plots in this regard. Petrol trimmers are characterized by increased power, which is associated with the ability to handle large areas. Gasoline-powered devices sometimes fail, too, which can occur for various reasons. Most often due to errors in the maintenance of the device.

It is very important for gasoline trimmers to periodically clean the fuel tank and change the oils. To increase the life of the electric trimmer, regular maintenance is carried out on various parts of the mechanism. Maintenance of equipment elements should not take a lot of time, since it consists in the procedure for lubricating the rubbing parts before cleaning the filter.

The shaft and gearbox are the most subject to wear in the trimmer mechanism. It is for these elements that the lubricant is intended, which is available for sale in most garden equipment stores. The design of the gearbox consists of a crankcase with many gears that interact intensively with each other and transmit torque. Thanks to lubricants, friction is reduced, and wear is significantly reduced. The principle of adding lubricant to the gearbox is not complicated. Having unscrewed the plug-bolt on the body, the contents of the tube are squeezed inward. As a result, the entire space of the gearbox must be filled.

In the production process of trimmer lubricant, special substances are used that meet environmental standards.After use, they are capable of degradation in the environment without causing damage. Since the consistency of the composition has a level of increased viscosity, when heated, the lubricant in density decreases. This ensures reliable protection of the elements in conditions of maximum temperatures.

The performance and duration of the trimmer is determined by the level of modern maintenance. Standard maintenance operations for the device include lubricating the gearbox and cleaning the air filter.

The filter cleaning process involves:

removing the casing and removing the element;
flushing the casing with gasoline and drying;
cleaning the place where the filter is inserted from dust and oil.

After completing the above steps, it is necessary to ensure that the rod does not rotate in the bushing. Next, they move on to lubricating the gearbox, for which some gardeners use grease. This will require:

Long-term use of garden equipment is ensured by a special lubricant for the gearbox. Renowned trimmer manufacturers, including Champion, Stihl, Makita, Husqvarna, produce their own garden care products, eliminating the potential problems associated with finding and choosing the right lubricant.

The lubricant must be changed in the gearbox at intervals of 50 hours of operation of the unit as a whole. To find out more accurate data for a specific model, you can look at its technical data sheet. Maintenance is necessary for the trimmer shaft, so it must be cleaned and greased liberally immediately after purchase.

Before starting the trimmer for the first time, perform a number of sequential actions:

Examine the gearbox.
Prepare the correct fuel mixture.

The implementation of these actions is recommended not only for new devices, but also when preparing old units for the next season after storage. If there is little or no lubricant, then this leads to increased friction of the gear part of the gearbox. Since it must operate at fairly high speeds, the gearbox must be checked regularly before starting the petrol trimmer.

If the gears overheat, this leads to the failure of the brushcutter gearbox. To prevent this, starting and running in the trimmer begin by inspecting and lubricating the bevel gear. To fill oil in the gasoline scythe gearbox before starting it, you should:

Unscrew the screw located at the bend in the gear housing.

Stir in the "Litol" grease in the amount of 1-2 ml.

Tighten the screw.

Grease is added to the gasoline trimmer gearbox every 8-10 hours of unit operation.For this, a special technological hole is provided in the housing. The module should be inspected for the presence of grease both before the first and before each subsequent use of the equipment.You can purchase a special compound for the gearbox in the form of tubes with a long supply spout, the diameter of which must match the size of the hole. This is not always the case, since models from different manufacturers differ in their hole diameter.

Image - DIY do-it-yourself trimmer bevel gear repair

The mass and piece production of trimmers is based on the use of generally accepted technology, a typical design scheme consists of certain elements and parts, it is important to know them when carrying out independent repair work:

top part. The basis of the entire structure, where all important elements are collected, such as a starter, a carburetor and a petrol cutter engine;
middle part. A hollow rod, inside it is a cable that connects the motor and the gearbox, which drives the cutting line. In this part there are fasteners for distributing the weight of the entire structure and a belt for fixing the trimmer on the belt of a person using the trimmer for its intended purpose;
Bottom part. It houses the gearbox and cutting elements, which are hidden under a practical cover to protect the user. The casing provides an increased level of safety, preventing large fractions of debris, stones and glass from entering a person while working with a petrol cutter.

Knowing exactly the internal structure and the principle of operation of the trimmer, you can independently carry out repair measures for the structure or replace individual components that have become unusable, using the repair instructions.

The most common and common failures of the unit that need to be corrected on their own include the following problems:

engine malfunction, due to which the brushcutter does not start and does not work;
increased vibration of the brushcutter bar, which complicates its intended use;
increased overheating of the gearbox, its accelerated heating during operation;
slow and weak functioning of the cutting line at insufficient speed;
clogging of the starter grille, causing overheating of the engine and its refusal to work;
fast and frequent clogging of the carburetor due to the use of low-quality fuel;
clogging of the air filter due to non-observance of the measures for the care of the device.

All these problems can lead to the fact that the device will lose its working capacity. Before ordering the necessary spare parts for the mowing, a visual inspection and diagnostics of the device should be carried out.

Particular attention should be paid to individual spare parts and units of the device, to check them you do not have to contact a professional master, a set of diagnostic measures will help you to identify the consequence of a loss of performance with your own hands.

If the trimmer motor does not start or stalls immediately after starting, when the gearbox overheats or during the operation of the device, extraneous noises are heard and vibration is clearly felt, it is important to visually inspect and identify a non-working unit.

To optimize the preparatory measures before repairs, you should carry out a simple diagnosis and check step by step:

the presence of fuel in the tank and lubrication in the main units;
serviceability of the spark plug and its performance;
the cleanliness of the fuel and air filter of the brushcutter;
clogging of the outlet channel and breather of the device;
the quality of the fuels and lubricants used.

To determine the functional efficiency of the petrol-cutter's ignition, it is necessary to determine whether the spark plug is working by testing the appearance of a spark when it comes into contact with the body of the functional device.

The spark plug itself can be replaced with a new one, having previously dried the candle channel, if necessary, the old element is also dried, cleaned with special devices and returned to its place.

In the process of inspecting the carburetor, it is worth paying attention to the possible leakage of the fuel used; to identify problems with the carburetor, the following measures must be taken:

purging the fuel hose to eliminate possible blockage of the element;
checking and replacing the gasket between the engine and the carburetor;
determination of tightness and maintenance of constant pressure in the unit.

If necessary, you can personally disassemble and thoroughly clean the unit using gasoline, the jet and channels are cleaned using compressed air.

The gearbox transmits torque from the motor shaft to the cutting tool, its gears during operation must be absolutely clean and always lubricated with special grease.

Carrying out a technical inspection on your own once a season will allow you to get rid of the need to repair the gearbox or replace it, with the purchase of an expensive new unit.

The starter is necessary to bring the trimmer into working condition, its diagnostics consists in checking the tension of the starter cord connected to the teeth of the starter coil, which are often destroyed during an abrupt start.

An inoperative starter in a petrol cutter cannot be repaired; it must be replaced with a working unit as part of a mandatory technical inspection or a set of repair measures.

Video (click to play).

Cutting elements require special attention and care, which must always be cleaned of dirt and cut grass after use. Regular inspection and thorough preparation of the device for operation will help to avoid costly and time-consuming repairs, and always be confident in the performance of the petrol brush.