Backhoe for a mole cultivator with his own hands

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Moleben mole cultivators, produced by Moscow MPO im. В.В. Chernyshova, have become widespread among gardeners, who usually buy them complete with rotors, which is enough for processing the soil on individual plots.

Fig. 7,a shows the left side part of the power tiller with the rotors. On the example of this part and let’s analyze some disadvantages of the construction of the Mole, and, more precisely, the disadvantages of its rotors. first of all we should note that the blades of the rotors are very blunt, and the pins that fix the inner rotor to the gearbox shaft and the outer rotor to the inner rotor are too far protruding from the rotor shafts. As a result, roots and plant stems get wrapped around the protruding parts of the pins, which together with the soil clog the space between the inner rotor and the gear housing, as well as between the two rotors. All this creates additional load on the gearbox shaft, and the rotors begin to rotate unevenly.

The spring retainers, which are inserted into the holes in the pins, are also too long, which maximally contributes to winding roots and plants on them with the above-mentioned consequences! Again long beyond the necessary bolts securing the blades to the square flanges of the respective rotors.

I got rid of the first drawback. blunt blades. right after purchasing the Mole, by sharpening them on an emery to fix them on the flanges. The other drawbacks I have revealed after the first spring tillage in 1994 and, of course, eliminated them, which greatly facilitated the further operation of the Mole.

Now a little more detail about the correction of other deficiencies. In Fig. 8, a and b are the diameters of the rotor tubes and the lengths of the pins inserted into the holes of these tubes. You can see that pin 1 projects from the pipe by 9 mm and pin 2 by 11 mm. To drive in the heads of pins, I have made punctures with diameter 15,6 mm and depth 2 mm in pipes of rotors from one side, and have reduced cylindrical parts of pins to length 44 and 36 mm accordingly, having drilled in them through holes with diameter 2 mm at distance 2,5 mm from end faces.

Instead of the former long clamps made of 2.5 mm wire, I made rings (like key rings) out of springy wire with a diameter of 1.5 mm. The ring is inserted with one end into the hole of the pin (fig. 8, c), fixing it on the pipe. In 3 years of operation, there have been no cases of loss of rings during tillage, and the accumulation of roots and soil has practically stopped.

Bolts 7 (see Fig. Fig. I shortened them by 5 mm and screwed on 5 mm nuts (2 mm thinner than they were).

All blades in the place of fastening to the flanges, I have hewn off by 6 mm, as shown in Fig. 9, a and b, so that these edges were flush with the edges of the flanges. Then, I sharpened the knife edges, shaded by crossed lines, at an angle of 45° (if by sharpening the knife we remove metal from one side of it, then by forming the chamfer. from the other side). The flanges of the left-hand rotors (Fig. 9, b and c) I also cut a 45° angle on four sides at a length of 72 mm. At the rotor flanges of the right side of gearbox shaft I have ground edges from the same sides, but I displaced grinding edges to the opposite edge of rib (fig. 9, d the places of such sharpening are opposite the bold lines).

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Such modification of blades and flanges eliminated cavities, reduced soil accumulation in them and on the flat edges of the flanges and blades, made it easier to use the tiller.

Frequent malfunctions

When we talk about the repair of the Mole motocultivator, it is worth listing the following breakdowns and ways to fix them:

  • Faulty ignition. a common breakdown of the Mole power tiller. Check the spark plug first. unscrew it and inspect it. A dry spark plug indicates that no fuel mixture is getting into the cylinder. If the spark plug is very “wet”, “pump” the engine with the hand starter. this way you can dry out the cylinder. If there is a lot of soot on the plug, clean it with a fine sandpaper and gasoline.
  • Gap between electrodes is usually 0.8 mm. Adjust if necessary.

Faulty ignition. a frequent cause of repair of motocultivator “Mole

  • No spark. If the spark plug is faulty, just use a new one (here is a link to spark plugs from Aliexpress). It is also possible that the circuit is loose or the clearance between the magnet wire and the ignition coil is faulty.

The ignition of a Mole power tiller depends on the condition of the gasoline hoses, the insulation of the high-voltage wires and their connection. Check everything carefully, the flywheel plates MUST NOT touch the magneto cores. Check that there are no signs of touching.

  • Check the air filter. If it is dirty, the carburetor is not getting enough air. Even a dirty muffler affects engine power.

You could not find the ignition failure? Call a professional, you cannot cope with a serious problem on your own.

With all the simplicity of design, motocultivators Krot are extremely sensitive to contamination of individual nodes, parts, mechanisms and other components of the unit. Many operating problems arise from late replacement of consumables, disregard of the basic rules of care for equipment. The ironic slogan “Tanks don’t fear the dirt” does not work in this case.

Let’s analyze the most frequent problems and breakdowns, which appear in the main parts of the cultivator.


The first models of Mole cultivators had many criticisms exactly concerning the engine, which was unreliable, low engine life. Owners of the equipment at their own risk remodeled agricultural machines. Often new engines were installed on the units to replace worn-out native ones from other garden equipment: Forza, Patriot, Sadko, Lifan.

mole, cultivator

Thanks to the factory design developments appeared cultivator models with motors Honda GC 120, Honda GC 135, Greenfield, GeoTeck, Subaru Robin EY-15D, Hammerman, INNOMOTOR, BriggsStratton of Japanese, German, American, Hungarian, Italian brands.

Thanks to modern engines, innovative developments, the Mole from the once narrow-functional milling cultivator has become a universal agricultural machine that is able to perform any agricultural work on the soil, crop cultivation, as well as transport goods, clearing the area.

So if your Mole is equipped with the old two-stroke engine, change it for a new model and boldly expand the machine’s range of functions. The most budget and fairly reliable option is Lifan, “Americans” and “Japanese” will be more expensive, but then the attention to themselves will require much less.

The device

The designers of the machine have made it as simple as possible. This, firstly, made it less vulnerable during operation, and secondly, allowed people who were far from understanding complex mechanisms to use it for their agricultural needs.

The Mole is approximately 1300x810x1060 mm in size, making it easy to store. Even a barn or garage will do. This makes the service of power tillers “Mole” even easier and more attractive.

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The machine is simple and consists of an internal combustion engine, frame, gearbox, mounting bracket and handle. Detachable wheels, which are included in the kit, will allow you to make no special effort during transportation.

Mechanisms with which you can control the engine speed, clutch and, in some models, rear gear, are located on the handle. Attachments, such as weeder cutters or wheels, required when working with the plow, are provided to attach to the gearbox.

Cutters, sharp in themselves, are made of hardened steel, which makes them resistant to external corrosive influences and allows them to be in working order for decades.

Depending on the modification, the machines are equipped with engines with a capacity of up to 6.5 liters. с. This makes the Mole single axle tractor a real helper. Instructions for use are written in accessible language and do not omit any details.

For more details about the Mole motocultivator see

Modernization of the Mole motocultivator

In Russia they have been producing motocultivators of the “Mole” type for a long time. The first model of the MK-1 mole cultivator was designed as a single-purpose machine for tilling soil. By now the technical capabilities of power tillers have been significantly expanded and even a mini forage machine has been developed as a set of machines. Outwardly, motocultivators resemble power tillers and their basic structural units are the same.

Description of KROT motocultivator

MK-1 “Mole” motocultivator:

mole, cultivator

operating device (rotor); 2. gearbox; 3. operating device knife; 4. gas tank; 5. engine “stop” button; 6. clutch control lever; 7. carburetor throttle control lever; 8. engine; 9. coulter; 10. support; 11. frame; 12. transport wheel

The main nodes of the MK-1 (see Fig. Fig.) are the engine with the built-in gearbox (described below), transmission, control system, operating elements, coulter, wheels.

The transmission transmits torque from the single-stage engine gearbox to the working parts and consists of a V-belt drive and a lower two-stage gear. The V-belt transmission also has a clutch function. Operating elements are mounted on the output shaft of the reduction gear.

The control system consists of two arms that are adjustable in length and width. Throttle lever on the left and clutch lever on the right. The control system has a stop button to stop the engine.

The tools are designed as rotors, each with four specially shaped blades. Two or four rotors are used for the milling drum 320 mm in diameter. The first option has a working width of 330 mm, the second has a working width of 580 mm. With the addition of two rotors, the machine can handle a cutting width of 830 mm. The milling drum rotates at 85 rpm and cultivates the soil to a depth of up to 20 cm (depending on setting).

The power unit moves forward by rotating working elements. rotors that simultaneously perform the technological process.

The coulter is fitted behind the tools and serves as a depth control for the tillage depth. Height adjustment of the coulter in steps.

A pair of wheels in the form of discs with a rubber rim has no drive and serves only for moving the cultivator, and during operation the wheels are lifted up.

Productivity MK-1 at milling the soil to a depth of 20 cm is 0.017 ha / h and at cultivation to a depth of 10-12 cm. 0.05 ha / h, that is, its use on the most labor-intensive operations of treatment. The coulter is installed behind the cultivation tools and acts as a depth control. Additional devices are supplied with the MK-1 power tiller: wing shares with L-shaped blades with a wedge-shaped blade; discs that protect from damage during rotary tillage; hiller. Using these devices, you can equip a unit, for example, for the combined processing of potato row spacing: sharecroppers are installed instead of the working elements of the rotors, and the protective discs on the shafts of the sharecropper sections; the duckboard is mounted instead of the dock on the back of the frame. When the machine is working, the knives loosen the soil, trim the weeds and at the same time contribute to the movement of the tiller, and the hoe on the loosened soil hoes in one pass two adjacent rows on one side of each. Such unit cultivates 0.14 ha/h, which is 18 times more productive than doing similar work manually.

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Dimensions MK-1. 1300 X 800 X 810 mm, weight 50 kg, it can be easily placed in the trunk or on the roof of the car.

In general, for the modifications of all tillers of “Mole” type, besides the already mentioned for MK-1 work tools, they produce a small plow, mower, semi-trailer with a carrying capacity of 200 kg, and a water pump. A front attachment is developed, which forms a motor carriage when the attachment is connected to the power unit of a motor cultivator. Sprayer, home sawmill and other attachments are designed to be used with this power pack.

MK-2 and MK-3 versions have 320 mm wheel diameter, 90 mm ground clearance, 285 or 600 mm track, 1960X800X1170 mm overall dimensions. MK-2 model has one forward gear, which provides up to 7 km/h speed, weight 50 kg. MK-3 model has two forward gears with travel speed of 4.7 and 7.1 km/h and two reverse gears (2.8 and 4 km/h), weight 60 kg. This model has additional pulley mounting option, and is equipped with rear and front linkage. With the help of a pulley it is possible to drive different small-sized machines, including those used in domestic livestock farming. Rear linkage is used to mount or hitch implements related to the use of tractive force (plow, ogee, semi-trailer, etc.).). The front one is linked and driven via a V-belt drive to implements and machines with active implements (mower, feed mill, pump, etc.).

Improving the KROT power tiller

For higher performance, I propose to set the MK 4-stroke engine manufactured in China LIFAN 160F, with a capacity of 4 hp. In this case, the power of the MC at low rpm is increased. Now it is not necessary to increase engine speed, in order to process ground depth of 20 cm (according to the passport). In addition, the processing depth has increased by 1.5 times at the expense of power to about 30 cm. (before the belt slips). The engine easily copes with this task.

Another big advantage of this change is that the engine starts when cold or hot. The engine speed is automatically maintained at the setpoint. With more power, gasoline consumption has remained approximately the same as that of the regular engine, besides now there is no need to add oil to the gasoline (4-stroke engine).

The new engine can be installed without much effort and without any modifications. Engine mounts fit into place. The pulley is taken from the old engine, a little bit drilled inside the hole and the keyway.

Rather tortured with the old engine, now the new engine gives a completely different emotion when working with a power tiller!

Read more: Less frequent mechanisation in the home and farmhouse. Under ed. И.П.oil. 1996г.

machine advantages

The single-axle tractor has been modified many times since the beginning of production. Regardless, old and new models have many significant advantages:

  • Easy to use.
  • Excellent ergonomics for comfortable operation.
  • Reliability of parts and assemblies.
  • The ability to reconfigure for a variety of jobs and tasks.
  • Low price.
  • Small dimensions that allow transporting it in a car and storing it in a shed or garage.
  • Long service life.

As a disadvantage, it can be noted the small width of the area of land, which it captures for processing.

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