Disassemble The Trimmer Gear

How to lubricate the gearbox

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

• Inspect 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 will damage the mowers’ 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 on the bend of the gear housing.
• Stir in the “Litol” grease in the amount of 1-2 ml.
• Tighten the screw.

For this, a special technological hole is provided in the housing. The module should be inspected for the presence of lubrication both before the first and before each subsequent implementation of the equipment.

Trimmer reducer device

Trimmer reducer. This is a unit that transmits the rotational movement of the motor shaft to a knife or fishing line. It is located at the lower end of the lawn mower bar. The transfer assembly is also designed to reduce the trimmer engine speed.

The mechanism consists of a suspension from a lawn mower model from several gears rotating at high speed. As a result, they heat up due to strong friction. If there is not enough lubricant, or there is none at all, then the process leads to severe overheating and failure of parts, and, accordingly, the need for complex repairs. To prevent this from happening, the Transfer 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 seat size. It happens:

The most common diameters of round seats. These are 24, 25.5 and 26 mm.

Lawn mowers are equipped with gearboxes with different types of gears:

• Conical;
• Worms;
• Spiroidomas;
• Cylindrical;
• Planetary;
• Volnov;
• Combined.

Drive shaft and gearbox. These are heavily loaded trimmer assemblies that are subject to significant wear. Between them, 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.

The device and principle of operation of the trimmer gear

Reducer. This is a device for transmitting rotation to the cutting part from the motor shaft. Its second purpose. Conversion of the angular speed of rotation of the output shaft to lower or higher revolutions. In the first case, the device is called a “demultiplier” and is used on a trimmer with powerful engines, in the second. “Multiplier” and is installed on low-power tools. The reducer is always located at the bottom of the boom of gasoline and electric streamers of different brands, be it Champion, Huter or another brand.

The gearbox is as follows. Basic details. This is a pinion shaft (for transmitting motion from the engine) and a gear wheel mounted on the driven shaft (for rotating the cutting unit). To reduce the frictional force during movement, rolling bearings are placed on the bearing points of the shafts. They are protected by special washers to retain lubricant and prevent dirt from penetrating into the seat. All parts are placed in a duralumin case with a special technological hole for greasing. It is necessary so that you do not have to constantly disassemble the unit to perform lubrication.

Thus, the design of the gearbox, depending on the model and brand that produced the equipment (for example, Sterwins, “Foreman”), includes several gears interconnected by teeth to transmit rotation and moving at high speed. They get very hot due to significant friction.

How to disassemble the trimmer gear

Regularly using the lawnmower, its owner may notice an increase in the temperature of the gearbox or the appearance of new uncharacteristic sounds in it, which were not heard before. These signs indicate that the mechanism requires lubrication. If you ignore them, after a while new, more significant problems will appear. So, without lubrication, gears wear out much faster and soon require replacement. In some cases, the part is jammed during operation. It should be understood that a damaged Transmission Mechanism can cause damage to the second parts of the structure. It is quite feasible to repair the trimmer gearbox, as well as to lubricate the part with your own hands, if you know how such procedures are performed correctly, as well as have the necessary tools and materials.

Typical malfunctions. Causes and elimination

Heavy use can damage the gearbox. Most of the faults of this unit are typical for different brands of trimmers and are eliminated in the same way.

• Strong heating of the transfer unit. There are two reasons. New gears that are NOT worn in or grease: inadequate, of poor quality, or none at all. If the lubricant is the problem, it should be replaced with another one. And the new gears must be run-in for a short time without significant loads and intermittently so that the parts have time to cool.
• The shaft jams while driving, knocking and backlash appeared. These signs indicate bearing wear. It is necessary to disassemble the gearbox and install a new part. Bearing failure is caused by poor lubrication or lack of lubrication, as well as increased trimmer load or metal objects getting into its Landing seat, which is due to a damaged boot. To remove and install a new bearing, you need a special puller or hammer with a block of wood. You need to be careful not to spoil the Planting Nest. Its preliminary heating is allowed only in the most difficult cases.
• When mowing, the gearbox dangles or flies off the bar. It means. Its body is damaged, it is necessary to install a new part. If the defects are insignificant, you can use a metal clamp to tighten the fracture site.
• If the Transfer Gear is NOT supported on the boom, it means the docking point is worn out. It is necessary to replace the rod with a new one or wind up the mount with electrical tape, if it is partially damaged.
• The knife on the shaft does NOT rotate or stops when the load increases. Cause. Wear on one of the gears or teeth. It is necessary to replace worn parts with new ones.

The owner of the trimmer can fix most of the gearbox malfunctions on his own. You just need to have a suitable tool, spare parts (it is recommended to use original ones. For a specific model of lawn mowers), and also know how to disassemble the gearbox in order to replace the damaged element with a new one.

Lubricant selection rules

Many garden tool companies such as Stihl and Husqvarna make their own lubricants for their products. In this case, it is recommended to use such products. It reduces the wear and tear of equipment in the best way. If original lubricant is not available for the trimmer, several factors should be taken into account when choosing a composition:

• The quality of the products of the brand that produces the lubricants;
• The viscosity of the composition. This parameter is influenced by the shaft torque;
• Adhesion to the surface of the component parts;
• Consumption of lubricating coating. Take into account air temperature, type and volume of work performed.

By consistency, lubricants can be liquid or semi-liquid, with various additives and additives, as well as plastic and solid. The plastic ones are the most common, and the hard ones represent their original state. The most popular in composition are:

• Graphite lubricants that reduce friction and improve gear movement;
• Lithium compounds with high anti-corrosion properties and additives that reduce metal wear;
• Multipurpose substances containing mineral oils and additives that increase the performance of the gearbox.

The most common lubricants include: Litol-24, Champion EP-0, Azmol 158, as well as the composition of the company “Stihl”.

Gearbox lubrication algorithm

It is necessary to disassemble the assembly in order to lubricate the gear unit. For this, a special hole is provided in the upper part of the case. In addition to the gears, components such as the bearing assembly must be thoroughly lubricated. The wear of its sealed walls leads to the fact that the grease comes out of the seat and vibration of the equipment begins. This problem is relevant for Chinese trimmers. The solution will be to replace the “native” bearings with high quality parts. The flywheel is also subject to lubrication. During operation, the part is covered with fragments of grass, which create additional resistance when mowing.

Solid grease or oil is placed inside through a hole protected by a screw. In this case, the following actions are performed:

• The gearbox housing is carefully cleaned of dirt, especially near the plug, to prevent debris from getting inside the unit;
• A special device is supplied with the lawn mower, they remove the cork;
• From a tube or using a syringe, grease is introduced into the hole, smoothly turning the cutting unit so that the substance is evenly distributed over the teeth of the gears;
• Return the plug to its original place.

The gearbox must be lubricated annually, and with intensive use, this procedure should be performed every 20 hours of tool operation. If signs of breakage appear, the lubrication site should be treated with the composition of the lubrication site as soon as possible.

Breakdown prevention

To avoid breakdowns and subsequent expensive repairs, it is recommended to follow a number of simple rules for using the trimmer and maintaining the gearbox.

• You need to lubricate this garden tool immediately after purchase. Before using. Usually the manufacturer (for example, Interskol or Huter) applies only a small amount of lubricant, which is sufficient only for running in.
• At the end of the season or before long-term storage of the trimmer, disassemble the gearbox, check the condition of the bearings and gears, lubricate the assembly.
• Grease needs to be added after the tool has run for twenty to forty hours. With intense loads, this time is reduced to twenty hours.
• It is necessary to change the lubricant to a new one when repairing the structure or before the start of the season.
• When the gearbox overheats or makes a lot of noise, check for grease. If it is present in sufficient quantity, it is recommended to replace it completely with another.

So, you can repair and lubricate the lawn mowers’ gearbox yourself at home. Adding a lubricant will NOT be difficult, a detailed description of this process and recommendations for choosing a suitable substance can be found in the instruction manual for the tool or on, of which there are many on the Internet. Most of the breakdowns of gearboxes are typical for trimmers of different brands, it is quite easy to fix them if you know the correct procedure. And in order to avoid their appearance, it is enough to follow simple operating rules and carry out timely maintenance of the trimmer gear.

Typical malfunctions. Causes and elimination

Heavy use can damage the gearbox. Most of the faults of this unit are typical for different brands of trimmers and are eliminated in the same way.

• Strong heating of the transfer unit. There are two reasons. New gears that are NOT worn in or grease: inadequate, of poor quality, or none at all. If the lubricant is the problem, it should be replaced with another one. And the new gears must be run-in for a short time without significant loads and intermittently so that the parts have time to cool.
• The shaft jams while driving, knocking and backlash appeared. These signs indicate bearing wear. It is necessary to disassemble the gearbox and install a new part. Bearing failure is caused by poor lubrication or lack of lubrication, as well as increased trimmer load or metal objects getting into its Landing seat, which is due to a damaged boot. To remove and install a new bearing, you need a special puller or hammer with a block of wood. You need to be careful not to spoil the Planting Nest. Its preliminary heating is allowed only in the most difficult cases.
• When mowing, the gearbox dangles or flies off the bar. It means. Its body is damaged, it is necessary to install a new part. If the defects are insignificant, you can use a metal clamp to tighten the fracture site.
• If the Transfer Gear is NOT supported on the boom, it means the docking point is worn out. It is necessary to replace the rod with a new one or wind up the mount with electrical tape, if it is partially damaged.
• The knife on the shaft does NOT rotate or stops when the load increases. Cause. Wear on one of the gears or teeth. It is necessary to replace worn parts with new ones.

The owner of the trimmer can fix most of the gearbox malfunctions on his own. You just need to have a suitable tool, spare parts (it is recommended to use original ones. For a specific model of lawn mowers), and also know how to disassemble the gearbox in order to replace the damaged element with a new one.

Lubricant selection rules

Many garden tool companies such as Stihl and Husqvarna make their own lubricants for their products. In this case, it is recommended to use such products. It reduces the wear and tear of equipment in the best way. If original lubricant is not available for the trimmer, several factors should be taken into account when choosing a composition:

• The quality of the products of the brand that produces the lubricants;
• The viscosity of the composition. This parameter is influenced by the shaft torque;
• Adhesion to the surface of the component parts;
• Consumption of lubricating coating. Take into account air temperature, type and volume of work performed.

By consistency, lubricants can be liquid or semi-liquid, with various additives and additives, as well as plastic and solid. The plastic ones are the most common, and the hard ones represent their original state. The most popular in composition are:

• Graphite lubricants that reduce friction and improve gear movement;
• Lithium compounds with high anti-corrosion properties and additives that reduce metal wear;
• Multipurpose substances containing mineral oils and additives that increase the performance of the gearbox.

The most common lubricants include: Litol-24, Champion EP-0, Azmol 158, as well as the composition of the company “Stihl”.

The device and principle of operation of the trimmer gear

Reducer. This is a device for transmitting rotation to the cutting part from the motor shaft. Its second purpose. Conversion of the angular speed of rotation of the output shaft to lower or higher revolutions. In the first case, the device is called a “demultiplier” and is used on a trimmer with powerful engines, in the second. “Multiplier” and is installed on low-power tools. The reducer is always located at the bottom of the boom of gasoline and electric streamers of different brands, be it Champion, Huter or another brand.

The gearbox is as follows. Basic details. This is a pinion shaft (for transmitting motion from the engine) and a gear wheel mounted on the driven shaft (for rotating the cutting unit). To reduce the frictional force during movement, rolling bearings are placed on the bearing points of the shafts. They are protected by special washers to retain lubricant and prevent dirt from penetrating into the seat. All parts are placed in a duralumin case with a special technological hole for greasing. It is necessary so that you do not have to constantly disassemble the unit to perform lubrication.

Thus, the design of the gearbox, depending on the model and brand that produced the equipment (for example, Sterwins, “Foreman”), includes several gears interconnected by teeth to transmit rotation and moving at high speed. They get very hot due to significant friction.

Features of different types of gearboxes

Manufacturers of electric and lawn mowers install various models of gearboxes on their equipment. Usually they differ from each other in the shape and dimensions of the seat, which is made in the form of a circle (popular diameter. 24, 25.5 and 26mm), a square or an asterisk.

Another difference between gearboxes of Russian, Chinese and European brands. Types of gears. They are conical, worm, spiroid, combined, wave, planetary, cylindrical. Usually, worm gearboxes are used on lawn mowers.

Used types of grease

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

• The degree of adhesion of the compound to the metal of the assembly;
• Product brand;
• Lubricant consumption by the transmission mechanism.

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

Grease is consumed differently in different models. This is largely determined by the intensity of use of the lawn mowers and the heating of the transmission mechanism. It is considered that the lubricant is sufficient if the temperature of the reducer during operation does NOT exceed 40 ° C.

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 is improved;
• Lithium, which is also an excellent anti-corrosion composition, saturated with additives that increase the wear resistance of the metal without harmful substances;
• Multipurpose, highly refined mineral oil containing 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 in specialized outlets.

Champion EP-0 universal grease 120 gr

Basic gearbox malfunctions and ways to eliminate them

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

Gearbox malfunction	Possible causes of failure	way to eliminate
The transfer unit gets very hot	the use of an unsuitable (low-quality) lubricant or its absence	you need to replace or add lubricant
	the gears are new and NOT worn down	it is necessary to 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 knocking	destruction or significant wear of any of the bearings	replace the failed bearing with a new one
The transmission mechanism flies off the mower bar or staggers	damage to its hull	it is necessary to replace the part
		in some cases, with minor damage, a clamp made of metal is used to pull the place from the break
NOT fixed to the pipe	docking wear	you can make windings from an insulating tape at the attachment point or change the bar
the output shaft with the knife does NOT rotate or stops if the load increases	wear of teeth on gears or one of them	replacement of interacting pairs of worn parts is required

Bearings are destroyed due to the use of an unsuitable lubricant or due to lack of it. Also, their damage is caused by the harsh operating conditions of the lawn mowers and the ingress of foreign material particles (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 it is not there, 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 can lose the Required performance characteristics.

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

Trimmer reducer device

Trimmer reducer. This 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 lawn mower bar. The transfer unit is also designed to reduce the trimmer engine speed.

The mechanism consists, depending on the model of the lawn mower, of several gears rotating at high speed. As a result, they heat up due to strong friction. If there is not enough lubricant, or there is none at all, then the process leads to severe overheating and failure of parts, and, accordingly, the need for complex repairs. To prevent this from happening, the Transfer 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 seat size. It happens:

• Round;
• Asterisk;
• Square.

Lawn mowers are equipped with gearboxes with different types of gears:

• Conical;
• Worms;
• Spiroidomas;
• Cylindrical;
• Planetary;
• Volnov;
• Combined.

Drive shaft and gearbox. These are heavily loaded trimmer assemblies that are subject to significant wear. Between them, 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.

Gearbox self-lubrication algorithm

To lubricate the transmission mechanism, its preliminary disassembly is not necessary. A special hole is already embedded in the device for THESE purposes (it is shown in the photo below). In addition to gears, when lubricating, attention should be paid to the following elements of the mechanism:

• Bearings to the unit;
• Flywheel and starter coil pawl.

Lubricant injection hole

Pour oil or introduces solid lubricant from the grease nipple, closed with a screw. In this case, actions are performed in the following sequence:

• The gear housing is cleaned from dirt and adhered grass, especially the area around the plug so that debris does not get inside the mechanism;
• Using the appropriate tool (it often comes with a trimmer), unscrew the plug;
• In 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

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. Disassembled mechanism is convenient to lubricate with solid compounds.

The whole gear lubrication process is demonstrated in thes:

Lubrication of the Transfer Unit is required at least once a year, but it is recommended to do this after every 20 hours of intensive use of the lawn mower. If the first signs of malfunctions appear with the mechanism, then the lubricant must be applied as soon as possible.

Trimmer Gear Lubrication

Gears must be lubricated regularly in accordance with the recommendations set forth 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;
• The knives are turning hard.

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.

Repair and lubrication of the trimmer gear

With frequent, intensive use of lawn mowers, 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. To do this, you just need to familiarize yourself with the features of carrying out these works and stock up on some of the available tools.