Installation of a reduction gearbox on a single-axle centaur tractor

Constructive mechanism with their own hands

To personally make a homemade differential for a mechanism such as a single-axle tractor, you should pay special attention to the work. In this case, it is necessary to consider in detail the entire algorithm of actions for the manufacture of such parts:

  • First of all, you need to consider the design features of the used equipment (special equipment).
  • It is also important to select the best option for installation, which will fit the design features of the technical equipment.
  • You need to download and print out a diagram with exact dimensions or make it yourself.
  • Then select separately all the elements for the manufacture of such a mechanism (hubs, for power tillers, gears, camshaft and other components).
  • Then you also need to choose the option of manufacturing such a device, as a differential on a special equipment.
  • Study in detail all materials on how such a mechanism is made in practice by one’s own hands.
  • After studying the theory and preparing the necessary components you also need to pick up tools.
  • During the assembly process is also recommended to use the appropriate video instructions, which are present on the Internet.
  • All the prepared elements need to be preliminarily adjusted to a single size, which is used on the power tiller.
  • Subsequently, all components are assembled according to the instructions.
  • Finally, the part is checked for proper functioning, and only after that it is installed on the axle of the special equipment.

This construction must be performed strictly according to the instructions When making such a machine, care must be taken to ensure that the free movement of this part does not exceed 240 degrees. Components must be adjusted during fabrication so that there is nothing to hinder movement.

Important! In the manufacture of this equipment, take into account the fact that the differential is heavily loaded by the power plant, so that the part must be tested accordingly, so that later in operation it can withstand the loads transmitted.

If you make a differential on a single axle tractor by yourself, you need to strictly comply with all dimensions, as well as avoid gaps, otherwise this type of equipment will serve a short period. It is also important to use only high-quality materials, which were used in the creation of the factory components.

Additionally, it should be noted that there is no need to purchase all the parts for the device, as previously installed on a single-axle tractor spare parts can be used for this element. In other words, you can remove the working mechanism from the technical device for cultivation, and then modernize it to meet all the requirements of the owner of the special equipment.

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This is interesting: adjustment of the carburetor of a motor-block.

Differential for the power tiller and its functions

An integral part of the design of a motor-block is a differential. Differential. is one of the elements of the power drive, which consists of a pair of wheels on one axle. The main purpose of this mechanism is to distribute power to two wheels, depending on the resistance, this is important in the manipulation of turns to establish equilibrium. Homemade differentials are common among the owners of these mototractors.

Self-repair of the reducer

The need to repair a double-shaft gear reducer may arise for a variety of reasons. The troubleshooting procedure for most failures is extremely simple, does not require any special knowledge and skills. In most cases, the repair of the product follows a standard algorithm:

installation, reduction, gearbox, single-axle, tractor
  • Oil is drained, followed by cleaning of the unit from contaminants.
  • Cast iron or other type of converter is disassembled, each part is inspected for damage, defects, excessive wear.
  • If problematic elements are detected, they need to be replaced with new ones.
  • The device is assembled, the oil is changed.
installation, reduction, gearbox, single-axle, tractor

There are several typical problems that occur most often in this type of equipment. First of all, it is a clutch slip failure, which is eliminated by replacing the spring and discs. If the unit begins to make a considerable noise during operation, most likely an immediate oil change is required.

Be sure to read: How to use the tiller

How to change the oil in the mechanism

One of the most important factors affecting the service life of different types of gearboxes appears to be oil availability. It must be changed regularly to avoid most problems. To do this, follow the simple instructions:

  • Position the gearbox in the operating position with a slight tilt.
  • Check oil level. Normal values are 25-30 cm of the dipstick.
  • Position the single axle tractor on an elevated position, then unscrew the plug on the housing.
  • Wait until the oil has completely drained into a container, pour in new oil using an appropriate hole.

Products of most well-known manufacturers are suitable for use, as well as any other oil that meets GOST-17479.

How to change the oil seal

Owners of power tillers often have to deal with the breakdown of oil seals. a simple malfunction that can be quickly fixed. This will require a number of uncomplicated manipulations:

Performing this procedure in a timely manner is critical to the proper operation of the machine, since a faulty oil seal leads to intense oil leakage, which can lead to more serious problems.

The need for a differential

Many of the jobs you do with a power tiller (such as cultivating) involve straight-line motion. In this case, a rigid drive on both wheels works perfectly, making a single-axle tractor much cheaper and simpler.

If it is necessary to make frequent sharp turns, a single-axle tractor of this type will require significant physical effort. one of the wheels will be braking with the grousers, and the single-axle tractor will have to tilt, throwing the outer wheel into the air.

This is especially difficult if the single-axle tractor has a wide track and quite a lot of weight.

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A number of auxiliary attachment adapters are compatible with Kentavr brand power tillers.

  • Adapters for cargo transportation. for example, the trailer “Kentavr” 1PMB-0,7 or any other universal;
  • Attachments for planting crops. potato planters P-1CU, P-1C, K-1L with wheels for transportation, K-1C and K-1CU; seeders five-row 2BJ-5F for seeding cereals, vegetable 2-row SM-2, STV. 2, 5-row fine grain, 1-3 row chain seeders for garlic and tuber crops
  • tillage equipment. cultivators (inter-row KMO-1.2, solid KN-1), plows (“Kentavr” PNM 1-20, PN-1-20MB), ploughs, ridgers (Arrow-3), harrows, differentials (which are not provided by the design), and soil traps;
  • Hay harvesting devices. “Solnyshko” 4-disc rakes, rotary mowers (01B, KR-02);
  • Auxiliary mechanisms for utility work. shovel blade for snow removal, chopping machine for shredding branches, motor-block woodchopper (only with professional models);

In addition, additional adapters needed to retrofit power tillers include:

  • Couplings. universal and double;
  • Adapters. most often come with a seat and a universal hub (type BUM-2);
  • Stroker-increase the torque and traction of the unit;
  • Basic kits for converting power tillers into mini-tractors.

Features of making a reducer for a motor-block with their own hands

It may seem that the gearbox for a power tiller is a complicated technical device and can only be made in the factory. However, many of our farmers have homemade gearboxes on a single axle tractor. The most important part of the machine is the drive. When there is a need to buy a gearbox, you need to know that its further operation and even functionality depends on the quality of this very unit.

Gearbox transmits, appropriately converts the torque, the conductors for which are mechanical gears. To make a device can literally be made out of a throw-away item, you just need to understand the principle of operation of the construction.

Monoblock and reduction gearbox

Reducing reducer for a monoblock with your own hands. it is quite possible to create. They are used for modern monoblocs. Thanks to such gearboxes, the single-axle tractor can be operated on difficult soils. It is needed when wheels are stuck and vehicle power is insufficient.

The design of the gearbox of a monoblock gearbox depends directly on the design of the transmission. It moves the torque from the engine to the wheels, setting the optimum speed and direction of travel for the power tiller. The structure of the transmission includes a gearbox, differential, gearbox and clutch. Gear type transmission has gears in the form of a cone and a cylinder. Mounted on some types of equipment and heavy monoblocks.

In a reverse gearbox, the reversing process is carried out as follows: there is a cone-shaped coupling between the opposing gears. When it makes contact with the studs on the gears, the direction of rotation changes. Note that the gears must be in the form of spirals.


Gearboxes with which motor blocks are equipped, seem to be the same only at first glance. In fact, these devices can be divided into three groups. The differences lie in the design features of the gears. Let’s get acquainted with the representatives of this family in more detail.


Angular-type reducers are elementary structures that serve to dock the transmission with the power plant of the machine.

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Due to the lack of complex components, some farmers install homemade variants of angular reducers on motor blocks.

  • Gear case.
  • Pulley for belt drive with mounting.
  • Rotor shaft.
  • Flange together with mounting and bearing.
  • Washer and securing key.
installation, reduction, gearbox, single-axle, tractor


This is a more complex mechanism, which is impossible to recreate at home, not having special skills and knowledge.

Gearboxes are called reduction gearboxes. Due to its design features, the mechanism reduces the number of engine revolutions, simultaneously increasing the power output of the power tiller.

Such reducers have a long service life, so they are suitable for various works and do not suffer mechanical damage even under peak loads.

Unlike angular models, reduction reducers need additional cooling.


At the heart of this mechanism is a coupling that moves freely between the bevel gears.

Such reducers make it possible for the motorblock to move in reverse, which has a positive effect on the maneuverability of the equipment.

But for this you have to pay the price of loss of productivity and maximum speed. Therefore, it is up to each farmer to decide for himself whether to install a reversible reducer or not.

Gearboxes installed on motor blocks from different manufacturers have practically no design differences. That’s why disassembling the unit and replacing faulty parts is not a problem.

The only exception is a low-cost Chinese motor blocks. A non-disassembled reducer is installed here which is to be replaced as a whole if it breaks.

Gearbox, or, as it is also called, converter is a mechanism that serves for processing of torque with its further transmission to the shafts of a power tiller. The mechanical gears of the machine are responsible for controlling this process. In fact, the gearbox is an element of machinery, the quality of parts and assembly of which determines the service life of power tillers. This means that the gearbox is an inseparable part of the machine in combination with the motor. When buying it, there are just as many requirements for it as there are for the power unit as a whole.

With the increasing demand for gardening and horticultural technology, it became necessary to optimize the variety of mechanisms for different purposes. Converters have not been spared.

Types of mechanisms by the possibility of disassembly and reassembly

Depending on the ability to disassemble and repair the device, transducers are divided into:

  • Non-dismountable drives are installed on budget-priced machines. It is cheap to produce them because parts of low quality are used for production. Service life of such mechanisms makes up 1-2 seasons. Any malfunction in such a reducer leads to its complete replacement.
  • Disassembled designs. mounted on expensive equipment. They are of high quality and can be used for several seasons without a single failure. In case of a malfunction, these gearboxes can be dismantled and the broken part replaced.

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