Disassembly Of The Trimmer Gear

What kind of lubricant should be used for the trimmer gear?

During operation, the mechanical part of the 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. Lubricant for the trimmer gear 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, etc. The only exceptions are trimmers made in Russia: 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), universal plastic compounds 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.
• The rate of grease consumption by the gearbox. Here you have to rely on your own experience and the recommendations of specialists, since some trimmer manufacturers, relying on 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.

Replacing the lower gear for lawn mowers (trimmers)

It is believed that there is no universal trimmer gear lubricant, but this is not entirely true. In fact, a suitable lubricant will be the one in which the following components are located:

From time to time, in the midst of a busy mowing job, your trimmer will start making nasty, grinding sounds. This complains about the lack of lubrication, the gearbox is a more actively loaded unit of the device. And soon these "warnings" may be followed by a jamming of the drive.

Disassembly and repair of the lower gear of lawn mowers, trimmers. Read also

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

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

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

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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.

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 other 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.

Types of gearboxes and lubricants

Gearbox mechanisms by transmission type are divided into the following types:

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

The main elements of cylindrical mechanisms are gear cylinders. Lawn mowers are very often equipped with modules of this type, worm-type gearboxes, etc. Are installed on the trimmers. The transmission is carried out by the operating screw. Planetary types of gears differ in coaxial arrangement of shafts, and bevel gears. in intersecting.

The gear train is able to work effectively only if there is no mechanical damage to the unit. Normal temperature conditions must be created for the device to function properly. Even the smallest distortions or overheating can cause jamming of the mechanism elements. This can lead to a stoppage of the trimmer, malfunctions of the mechanism and serious consequences of its use, requiring repair of the unit parts.

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 with m of 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 lawn mowers’ 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 device and principle of operation of the trimmer gear

A gearbox is a device for transmitting rotation to the cutting part from the motor shaft. Its second purpose is to convert the angular speed of rotation of the output shaft to lower or higher speeds. In the first case, the device is called a "demultiplier" and is used on trimmers with powerful motors, in the second. a "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. The main parts are a pinion shaft (for transmitting motion from the motor) 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.

Trimmer reducer device

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 lawn mower bar. The transfer unit is also designed to reduce the rpm of the trimmer motor.

The mechanism consists, depending on the lawn mower model, of several gears rotating at high speed. As a result of this, 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 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 seat size. It happens:

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

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

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

The drive shaft and gearbox 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.

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The trimmer gearbox is a module that is needed for torque. The device includes one or more gears that rotate at high speed. The mechanism of this equipment is called a demultiplier, since it converts the angular speed of rotation of the output shaft into its lower speed.

Manufacturers equip lawn mowers with gearboxes that convert the low angular speed of the input shaft into an output speed that is higher. Low power motor allows the highest trimmer blade revolutions. The name of this option is multiplier. The trimmer, running on gasoline, is able to perform work related to mowing lawns, removing weeds without fail. The unit needs proper care, which involves changing lubricants.

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 grease both before the first and before each subsequent use of the equipment.

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 it. 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 is not difficult, a detailed description of this process and recommendations for choosing a suitable substance can be found in the operating instructions for the tool or on which there are many on the Internet. Most gearbox breakdowns are typical for different brands of trimmers, 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.

Trimmer Reducer. Lubrication and Troubleshooting

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 other 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.

The device and principle of operation of the trimmer gear

A gearbox is a device for transmitting rotation to the cutting part from the motor shaft. Its second purpose is to convert the angular speed of rotation of the output shaft to lower or higher speeds. In the first case, the device is called a "demultiplier" and is used on trimmers with powerful motors, in the second. a "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. The main parts are a pinion shaft (for transmitting motion from the motor) 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.

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 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 falling into its seat, which occurs 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 beat carefully so as not to spoil the landing nest. Its preliminary heating is allowed only in the most difficult cases.
• When mowing, the gearbox dangles or flies off the bar. This means that 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 transmission does not hold to the boom, it means that 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. The reason is the wear of 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 a damaged element with a new.

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 (the popular diameter is 24, 25.5 and 26mm), a square or an asterisk.

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

Disassembly and replacement of the gearbox

Due to the different gear types, shape and size of the seat, gearbox interchangeability is rare. Therefore, when purchasing a new part, you should take into account the model of the old unit and the brand of 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 carry out a replacement, you need to remove the gearbox from the rod and disassemble. To do this, you will need to loosen the tie 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.

Assembling the gearbox is easier than disassembling. Parts of the structure are installed 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.