How To Disassemble A Lawn Mowers Gearbox

How to disassemble the gearbox angle grinder
Do maintenance and repair work on your power tool with care and attention. With recommendations on how to disassemble the angle grinder gearbox, remove the anchor, a list of necessary tools and other information is presented here.

The elements

The angle grinder converts electrical energy into a mechanical action of the tool on the workpiece. Therefore, its construction consists electrical and mechanical. The bevel gearbox is just the main element of the mechanical part of the angle grinder. It includes the following nodes and details:

  • Gear case;
  • The spindle on which the working tool is located;
  • A leading bevel gear located on the rotor of the electric motor;
  • Driven bevel gear located on the spindle;
  • Rolling and plain bearings, which act as supports for the transmission of rotation.

How to pull the anchor

To repair the gearbox, it is often necessary to perform its complete disassembly with release from the rotor. In some types of grinder models, this is not so easy to do. The following guidelines provide guidance on how use the inertial properties of the rotor for this purpose.

In the first, the basis for performing work is locksmith vice, and in the second from a suitable square tube a small device is made. After lightly tapping the gearbox housing against the edges of the vise or pipe, the rotor is released from the gearbox. Which method is better. The user’s choice.

Necessary tools for disassembling the gearbox angle grinder

how to disassemble a lawn mowers gearbox

Grease for gearbox angular Makita grinder, 30 grams. Photo VseInstrumenty.Ru

Disassembly of the angle grinder gearbox should be done at a prepared workplace, where unnecessary details are missing. This is necessary in order not to lose the small structural elements of the gearbox. Workplace you need equip with the following tools and accessories:

  • Locksmith vice;
  • A set of wrenches and screwdrivers;
  • Different types of hammers. From wooden to steel;
  • Pliers;
  • Tool for working with retaining rings;
  • Gas wrench;
  • Pullers for bearings and gears pressed onto the shaft;
  • For a high-quality assembly of bearing assemblies, it is not bad to have the appropriate pressing equipment;
  • In its absence, you can use extensions of various designs;
  • Rags with detergents (kerosene and other similar liquids);
  • Availability of lubricants.

Varieties of lubricants

Effective operation of the gear transmission is possible only in the absence of mechanical damage and under conditions of permissible temperature. At the slightest distortions, as well as overheating, the danger of jamming the mechanism increases sharply. And this is fraught with not only work stoppages, but also serious damage.

For the maintenance of mechanisms, lubricants of different consistencies are produced:

  • Semi-liquid. A colloidal system containing various additives and additives;
  • Plastic. Most often used in gear and screw drives. This is the most versatile option;
  • Solid. Suspensions, plastic in their original state.

It is generally recommended to lubricate the gearbox of lawn mowers with special gear compounds. The vast majority of them belong to semi-liquid systems.

When choosing the desired composition, you should pay attention to the temperature regime for which the mixture is intended.

How to lubricate a lawn mowers gearbox: choose a lubricant

The gas trimmer is a handy garden tool that flawlessly performs the job of cutting lawn grass, removing dead wood and weeds. But, like any other tool, the device needs care: cleaning from dirt, sharpening knives, changing oil and, of course, lubricating.

What is a reducer?

What is a reducer

A mechanical gearbox is a module that converts torque. Basically, it is one or more gears rotating at high speed. In most cases, the gearbox converts the angular speed of rotation into a lower speed of the output shaft. This mechanism is called a demultiplier.

By the type of transmission, mechanisms are divided into several types:

  • Cylindrical. The main transmission element is a gear cylinder. A module of this class is installed on lawn mowers;
  • Worm. The screw is the transmission tool;
  • Bevel. The transmission is provided by the intersecting arrangement of the shafts;
  • Planetary. Based on coaxial position;
  • Wave;
  • Spiroid and combined.

Types of reducers for lawn mowers

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

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

  • Cylindrical;
  • Wave;
  • Worm;
  • Planetary type;
  • Conical;
  • Spiroid;
  • Mechanisms of the combined type.

The spur gearbox for a lawn mower consists of several toothed cylinders. They are rarely installed on trimmers, since most lawn mowers are equipped with worm gearboxes.

Planetary gearboxes deserve special attention. Their built-in shafts are located coaxially in the mechanism. At the same time, the shafts of the bevel gearboxes are in a cross position.

Another type of gearboxes is a reduction gear. Mechanisms of this type are not included in the standard equipment of lawn mowers, but they are almost always used to make homemade products based on garden trimmers.

Trimmer Gear Lubricant – features of choice?

For stable operation of the gearbox without jamming and regular breakdowns, this mechanism must be regularly lubricated. As indicated by the utility trimmer’s instruction manual, a high-quality, consistent gear oil is suitable for this.

In some cases, well-known garden equipment manufacturers produce their oils that are suitable for lubricating the gearboxes of branded trimmers. In order to make these substances as attractive as possible to buyers, they are made multifunctional. In other words, such oils are suitable not only for lubricating household trimmer gearboxes, but also for regular treatment of gears, fuel and oil hoses, as well as servicing other parts and assembly mechanisms, regardless of the type and purpose of garden equipment.

An example of a multifunctional material is the Oleo-Mac lawn mower gear lubricant, which uses molybdenum bisulfate. Another example is the composition of Liqui Moly LM 47 MoS2. Most often it is used to service CV joints, however, due to the content of molybdenum disulfide, it can be used to lubricate loaded high-speed bearings, including gearboxes for household trimmers.

An important advantage of multifunctional greases is the high content of a large number of necessary additives. Even after the lubricant is completely depleted, they continue to retain a thin and very strong oil film on the surface of the moving gears, which protects the parts from heat and increased wear.

Some trimmer owners use Litol-24 formulations or a lithium-based CV joint maintenance material for lubricating gearboxes. Due to their suitable consistency, these compounds are easy to add to the machine using a 5 cc syringe. These substances have proven to be inexpensive and fairly effective lubricants. Their only drawback is the need for more frequent replacement of these fluids.

How often should the gearbox of the lawn mowers be lubricated?

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

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

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

Lower and upper gear lubrication

There are tips that recommend lubrication at the end of the season. However, most people find it best to do this at the beginning of each season. When we repair a unit, as well as carry out any disassembly, it is necessary to use lubricants. The gearbox must be additionally lubricated when the old trimmer is inserted.

Modern trimmers are equipped with a gearbox that measures the angle of transmission of mechanical energy between two components: the shaft and the head. Bevel gears are considered common, they can easily withstand high speeds, are equipped with smooth engagement, as well as an increased level of bearing capacity. The housing includes a shaft, a gear wheel, which is pressed onto the driven shaft. In order to reduce friction, bearings are installed on the bearing points of the shaft.

How and how to lubricate the lawn mowers gearbox?

Responsible maintenance is the key to long tool life. One of the requirements in the operation of a lawn mower is timely lubrication of the gearbox, as well as cleaning the filters. Every user of such a unit knows what composition to lubricate the gearbox with. First, it is cleaned in several stages, then the element is removed from the casing. It is cleaned with gasoline and dried. The place for the filter is prepared carefully, cleaning it from dust and old oil. The main signal for lubricating the lawn mowers gearbox is extraneous noise and rapid heating of the equipment. This means that it is necessary to lubricate the spare part as soon as possible. For lubrication intervals, refer to the instruction manual for your lawn mower. The experts say that gearbox maintenance should be done every 15 hours.

Petrol trimmer grease

Correctly selected lawn mower care guarantees the durability and quality of the equipment. Manufacturers try to take into account all the nuances and prescribe what materials to use for maintenance. Usually, a specific type of lubricant is not specified, it is simply given generally known standards that lubricants must comply with.

The lubricant must be selected in such a way as to take into account temperature conditions, rotational speed, load dynamics and vibration. The main requirement is that this mixture remains in the zone of maximum friction.

Based on the above information, it should be noted that lawn mowers manufacturers are developing universal additional tools for their equipment. It can be served with general industrial compounds. The main condition is compliance with the operating conditions, namely, the presence of an anti-rust and lime agent in the composition, as well as a filler, which consists of a solid lubricant. Grease is poured into the gearbox through a special hole, the unit is not dismantled.

Replacement is done quickly enough.

  1. First, turn off the device from the network. Devices using gasoline must be drained of gasoline.
  2. If the lubricant changes completely, then be sure to flush the gearbox. To do this, first fill in the cleaner, then rinse the gearbox well, then drain. It is important to clean the entire case.
  3. Use the special tool that comes with the trimmer to unscrew the gearbox plug.
  4. Apply new grease: insert a syringe with a tube into the hole and squeeze out the grease (2-5 ml).
  5. We turn the shaft manually, turn on the scythe at low speed without load. This is necessary in order for the lubricant to be efficiently distributed in places subject to maximum friction.