Installation of the stroke limiter on a single axle tractor. Assembly work


What do you need a Stroke reducer for your power tiller?? Often when using a cultivator there are cases when it is necessary to reduce its stroke. Such situations arise when the indicators of working speed are much lower than the indicators of transport speed of the machine. Then a travel extender comes to the rescue, which increases the tractive power and torque of the machine.

Creation of a power reducer for a power tiller with your own hands

  • Perform all calculations on the design (rated power, number of revolutions per minute, torque).
  • Deciding on the case.
  • We take 2 gear shaft bearings and cut out the shell.
  • Mount the flange made of quality steel on the reverse side of the reducer.
  • Mount the steel washer and bearing (flange) inside the flange.
  • Now you need to turn the flange to the generator housing.
  • Connect all the components (pinion shaft, key, drive pinion) to the shaft and transmission mechanism.
  • Fixing the belt pulley.

Purpose of a reduction gearbox

No easier and safer solution for reducing speed than a cogged sprocket geared reduction gear. This is a type of attachment where the main drive element is the reduction gear unit. That’s what they mean when they talk about a power reducer for farming equipment. Using an additional chain, it converts the motive power of the motoblock itself to operate the auxiliary equipment.

Reduction gear unit

The main purpose of a variable speed drive is to increase the torque by reducing the engine rpm. Its operation is in demand and useful when using any attachment with a power tiller. However, it is necessary to approach its purchase or creation by your own hands carefully, focusing on what work will be required of it.

Of course, the easiest way to achieve reduced speed is to reduce the speed of the power unit. However, the power in this case will be lost, and with it, the productivity of agricultural equipment. To help us will be devices that can reduce the speed of the gearbox so that not to fall at the same engine speed.

Often, along with garden and garden cultivators, auxiliary equipment is used to expand its functionality or achieve greater productivity. Stroke limiter is one of these, which will allow the crawler to move at a slower speed for different operations. Farmers often equip it with pneumatic or other wheels to make it easier to drive on different types of terrain. It is usually necessary not to lose grip on the ground, otherwise the cultivator will slip.

The main conclusion: lowering travel speed is often necessary when the operator needs to send extra power not to improve speed, but to increase traction or torque.

Before you begin assembling the travel reducer yourself, you must know which specific components it consists of. This will allow you to maintain it more professionally in the future. The main components are more than 10:

  • cowl;
  • gearbox;
  • power take-off shaft;
  • clutch and gear unit;
  • gears;
  • side covers;
  • axle and sprocket;
  • load;
  • pinions;
  • bearings;
  • keys;
  • couplings;
  • bolts and nuts of various diameters.

How to adjust the speed?

Sometimes it happens that you want to change the speed of your power tiller: increase it or, which happens quite rarely, decrease it.

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One of the following two methods is usually used to increase the speed of power tillers:

The normal wheel diameter of almost all power tillers is 570 mm. the most common choice for replacement is a tire diameter that is approx. 1.25 times the given diameter, i.e. 704 mm. Although the difference in size is relatively small (only 13.4 cm), driving speed increases significantly. Of course, if the design allows you to put larger tires, you can try to increase the speed gain.

Gear set installed in the wheel gearbox, usually consists of two gears with the number of teeth 12 in the small and 61 in the large. It is possible to change this figure to 18 and 55 respectively (only specialists at agricultural machinery service centers), then the speed gain is about 1.7 times. Do not try to do the operation on your own to replace the gears: it is very important to pick up not only quality parts with minimal errors, but also the appropriate pulley. The gearbox shaft retainer plate also plays an important role.

Logically speaking, a decrease in speed of a power tiller can be achieved by performing the diametrically opposite actions. to reduce the diameter of tires or the number of cogs on the gear pair.

Another possible solution for increasing the speed is to adjust the throttle lever: when you start the machine, move it from the first to the second position. To decrease the speed go back to the original position. Of course, to change the speed downward you do not need special slows down. it is enough not to switch to high gears.

Also possible solutions to the problem of increasing the speed of a power tiller is to change the motor to a more powerful one and modernize or install the clutch system (some outdated models do not have it).

It can help to increase the speed (especially on uneven terrain or heavy soils, where slippage is common because of the machine’s insufficient weight) and installation of weights. They can also be made of metal parts with your own hands. The weighting structures are installed on the frame of the power tiller and the wheels. For the frame you need metal corners, which form a makeshift removable structure, that is, you can easily remove it if not needed. Additional ballast weights are attached to this removable additional frame. For wheels, you need steel discs and full-body iron bars with a cross-section in the form of a hexagon. These parts are welded and inserted into the hubs. For reliable fixation cotter pins are used, which are inserted into specially prepared holes.

Of course, if you do not have at hand round steel elements, you can replace them with almost any improvised material: products of reinforced concrete or even flattened round plastic flasks, in which sand is poured.

Don’t forget about your balance. the weights on the wheels must be equal in weight and the frame must be evenly distributed, otherwise you risk your machine tipping over sideways when you maneuver it.

To accelerate a power tiller with a cart in bad weather conditions. snow, slush, muddy soil from heavy rains. you can put a track (if the design allows it). This method requires the installation of an additional wheel set and the purchase of tracks made of rubber of a fairly large width. On the inner side of the caterpillar, limiters are attached to secure the rubber and prevent it from slipping off the wheelset.

The essence of the construction and the principle of making

In essence, this tool is the usual analogue of a reduction gear. By means of a chain, it makes it possible to turn the driving power of the machine into the work of an additional tool. It can be purchased in specialized stores or made by yourself. To assemble a walker on a single axle tractor, we will need:

  • the whole case from an alternator
  • Flanged bearing;
  • Rotor shaft;
  • bevel pinion;
  • steel;
  • screws;
  • pulley.
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It is not difficult to make a walker to a power tiller yourself, but people who have not previously encountered similar work may experience a number of difficulties. You need to have patience and be as careful as possible in order to achieve the desired result.

About the structure of a power tiller

Next you will learn what single axle tractor is better to choose.To be clearer, what is the principle of homemade motor-block and its additional components, it is necessary to consider in detail the structure of the motor-block as a means of small-scale mechanization. So, this unit includes several main working nodes:


As the main driving force in the design of power tillers uses a standard internal combustion engine. Depending on the type and brand of power tiller, e.g. Caiman Vario, Patriot Ural, Texas, Pro Arab, Crosser, VIKING, Forza, the engine used may be different:

  • Gasoline 4-stroke engine. This engine is used for units belonging to the light and medium class of devices.
  • Diesel 4-stroke engine. These engines are used on heavy and powerful power tillers designed to work on the most difficult terrain.

For more information on the operation of a diesel power block, see

Of course, there are also 2-stroke engines, but they are used in older models of motor blocks, and are quite inferior to 4-stroke engines in terms of power traction. However, most consumers get exactly 4-stroke engines that run on gasoline. Their device includes the following systems:

  • The system responsible for the fuel supply. Consists of a fuel tank, carburetor, air filter and fuel hose.
  • Lubrication system that performs the lubrication process on those parts that rub together.
  • Starter that cranks up the crankshaft.
  • Cooling system that removes heat from the engine cylinder block by means of airflow.
  • The ignition system, which produces a spark on the spark plug.
  • The timing system, which ensures that the fuel-air mixture enters the engine cylinder and is also responsible for the exhaust.

It is important that the engine is sold already with all the main working systems, which greatly facilitates the process of homemade motorblock.


The main function of the transmission is to transmit torque from the motor to the wheel base, as well as to regulate the speeds and change the movement of the unit. Its design includes several working units: gearbox, clutch, gearbox and differential (not all models have it).

Transmission can be of several types:

Basically, the classic type of pinion transmission is used on heavy power tillers, and it consists of conical and cylindrical gears.

The other types of transmission are used in light and medium types of power tillers. Regardless of the type of transmission, there is a PTO. PTO shaft, which transmits torque to the working parts of the machine.

As for the clutch, it can be different:

  • As a V-belt transmission. The essence of the process is the clutch lever, which tightens or loosens the belt, than transmits, or stops the transmission of torque from the motor to the gearbox.
  • Single-plate or multi-disc clutch of the dry or wet type.
  • Conical clutch.

Most quality power tillers Sadko, Don, Huter, Profi, LANDER, Champion, Carver use the second type of clutch, which is the most reliable.

All about the stroke-reducing clutch for the power harvester

Motor vehicles, in particular, motor blocks, not for the first year are for owners of agricultural plots faithful helpers, which can carry out a great range of works with the least amount of effort and time. Sometimes, however, the performance of these units is no longer sufficient for certain tasks, or the equipment is poorly functioning. A device such as a travel reducer (reduction gearbox) for a power tiller may help to solve individual problems.

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How much oil to fill in a motoblock gearbox

Keep a constant oil level in the gearbox during tillage. If this simple rule is not followed, the remaining lubricant can boil over and jam parts. Use only high-quality oil. Oil level is continuously maintained, but damage occurs in the sprocket. In chain drives, the chain breaks or is pulled out. If there are traces of oil on the outside, it is a sign of leaky seals. Worn parts need to be replaced with similar parts. Better if you buy it from a reputable manufacturer.

The gearbox ensures the smooth operation of your power tiller, extending its service life and increasing the unit’s efficiency. In this case the lubrication of its parts is a good helper. To lubricate the gearbox fill transmission oil. Its possible brand is ZIC 10W40, Super T-3. The oil level is determined this way:

  • you need to take a wire about 70 cm long instead of a dipstick and bend it into an arc;
  • Insert it into the filling hole as far as it will go;
  • Pull the homemade dipstick back out;
  • the wire should be oiled to a length of about 30 cm.

Assembling the shrink shaft by yourself

Having all the necessary spare parts, you can begin to assemble the shrinker with your own hands. To ensure that the finished construction performs its functions well, you must follow the algorithm described below:

  • First make all the necessary calculations so that the result is a well-balanced design. As an alternator, you can take an element from a domestic motorcycle “Ural”;
  • The main thing you need from the device is high power and stable torque;
  • Next, proceed to cut the shell of the two bearings that will be needed for the drive shaft. It will run the pinion. Take the diameter of the gearbox into account when working;
  • Then we need to decide on the bearings. The flange must be on the opposite side of the gearbox. There should be a metal washer inside it;
  • Next, install the driven shaft, on which the gear will stand. The product must be connected to the shaft of the rotary alternator and the transmission mechanism;
  • Finally mount the pulley to the machine shaft with a spring nut and a washer.

After making the variable speed drive, it must be tested. To test the device, it should be connected to the hitch of the machine, as well as set the wheels for the cultivator. If you have done everything correctly, the wheels will rotate slowly, while the cultivator itself will be pressed to the ground.

When choosing wheels for a power tiller, which will work together with a travel reducer, you need to pay great attention to their diameter. No need to choose too large parts so as not to overload the unit’s motor. The wheels with a diameter of 25 to 30 cm will be optimal.

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