31.07.2023

Welding technology on the MB Neva walk-behind tractor. Gearbox for walk-behind tractor Neva, Cascade, etc.: design, possible breakdowns and repairs

For modern gardeners, cultivating a plot of land is no longer as big a problem as it was in the recent past. Such universal equipment as walk-behind tractors has appeared on sale, which make life much easier for agronomists and gardeners.

Neva walk-behind tractors are one of the best units in their line. They are reliable, durable and multifunctional. You will be able to cultivate the land, care for plants, and collect and transport crops and garbage.

Here we will tell you about the gearbox for the Neva walk-behind tractor, its design and repair. This is one of the most significant elements in any car, so if you want it to last a long time and without breakdowns, you must know all the intricacies of its design, as well as the causes of malfunctions and methods for eliminating them.

Gearbox design on the Neva walk-behind tractor

The gearbox of the Neva walk-behind tractor is responsible for transmitting the rotation coming from the motor to the wheels and attachments. It controls the rotation number, speed, and direction - forward or backward. In principle, the gearbox for models MB 2 and MB 1 is not much different, so here we will consider the second option.
The gearbox is designed in such a way that the components necessary for changing gears are located on its outer part of the housing.

The gearshift lever has 5 positions. When you push it, the fork disengages the clutch. When you drop the lever, the fork resumes its original position.
The walk-behind tractor will pause when the drive is connected to the right axle shaft. Torque comes from the sprocket. When the handle is recessed, engaging the left sprocket, the gear is reduced. If you need top gear, the handle needs to be pulled out all the way.


Gearbox malfunctions and repairs

Like any other equipment, walk-behind tractors can also fail. If the problem lies in the gearbox, you need to disassemble it and repair it. Often the breakdown turns out to be insignificant and you can easily deal with it yourself.

First, you need to thoroughly clean this part from dirt and residual oil, which will also need to be drained. All parts must be inspected and checked for damage. If something fails, it needs to be replaced. Use only new elements that are suitable specifically for your Neva walk-behind tractor model. Also, do not forget to add oil after assembly.

Some common gearbox failures:

  • the spring or clamps are broken. They need to be replaced with new ones and then adjusted;
  • The settings in the switching system have gone wrong. You need to loosen the screws, engage first gear, tighten the screws back;
  • Oil is oozing through the shaft. Most likely the reason is the cuff, which is worn out. It needs to be replaced with a new one. How to replace oil seals? It is enough to remove the old ones by prying them off with a screwdriver or other object and install new ones;
  • jamming appeared. This may be due to an open circuit. It needs to be replaced with a new one;
  • you can't record the transmission. The reason is that the fork brush is worn out, so it needs to be replaced.

These are the main and most common gearbox failures. It is very important - if you cannot fix the breakdown yourself, then you should seek help from professionals.

Changing the oil in the gearbox of the Neva walk-behind tractor

It is also worth talking separately about changing the oil in the gearbox of the Neva walk-behind tractor. This needs to be done every fifty hours of work. It is also important to check the oil level. A straight wire is suitable for this. You put it in a container with oil and it should be 25-30 centimeters wet. You will learn which oil to fill into the gearbox of the Neva walk-behind tractor from the operating instructions. Most often these are transmission TAD-17I, TAP-15V and others in accordance with GOST 23652-79.

Neva MB-2 walk-behind tractors - small agricultural equipment designed for soil cultivation - are gaining great popularity among farmers, summer residents and gardeners. different types, from light and loamy in personal plots to virgin soil with rocky inclusions. When equipped with mounted and trailed mechanisms, the unit can perform the following work:

  • milling, loosening and leveling the soil;
  • harrowing and cultivation;
  • hilling and digging up root crops;
  • watering, spraying, pumping water;
  • crushing and mixing feed and fertilizers;
  • transportation of goods over short distances;
  • cleaning the area from debris and snow;
  • soil drilling.

Agricultural equipment is produced by the St. Petersburg machine-building state enterprise "Red October". The company's activities are aimed at mass production multi-speed walk-behind tractors and walk-behind cultivators with domestic and imported engines from leading foreign companies Subaru, Honda, Briggs & Stratton and modernization of attachments that can increase productivity, facilitate the physical work of people and create maximum comfort while using the unit.

Modifications and engine range

Thanks to the search for technological and development solutions for updating model range The company has released several modifications of walk-behind tractors. The farmer can choose equipment of any power and performance, taking into account the country of origin.

The most common modules are:

  • Machine MB-2K-7.5. It has Russian engine power 7.5 l. With. The weight of the unit is 98 kg. Soil tillage depth - 32 cm. Characterized by: simple controls and comfortable operation.
  • Module MB-2B-6.0. Equipped with an American 6 HP engine. With. with electric start, has 4 forward and 2 reverse speeds, weight - 98 kg.
  • MB-2B-6.5. It features a more robust design and a power of 6.5 liters. pp., has improved pneumatic wheels with axle extensions and weighs 94 kg. Tillage depth - 20 cm. Economical, comfortable model with high traction and resource characteristics.
  • Motoblock Neva MB-2B-6.5 PRO. Completed gasoline engine Briggs&Stratton with 6.5 l. With. Cultivation depth - 25 cm, weight - 89 kg. Number of gears: 4 forward and 2 reverse. Designed for long-term work over large areas.
  • Model MB-Compact-2B-6.5 RS. It is characterized by its low weight - up to 65 kg, shallow plowing depth - up to 20 cm, and is equipped with a wear-resistant 6.5 liter Briggs&Stratton engine. with., additional mechanisms for modifying the walk-behind tractor and the possibility of expanding functionality, also has 2 forward and 1 reverse gears.
  • MB-2C-6.0 PRO. Equipped with a Japanese EX17D power unit with a capacity of 5.7 liters. With.
  • MB-2S-7.0 PRO and MB-2S-7.5 PRO are heavy-duty walk-behind tractors with the latest carburetor engines Subaru EX21D with 7.0 and 7.5 hp. respectively. Used for professional work on large areas.


The design of MB-2 walk-behind tractors is arranged according to the scheme of a single-axle pedestrian-riding tractor.

Characteristics

Technical characteristics of the Neva MB-2 walk-behind tractor:

  1. Travel speed at maximum power:
    • in first gear - 1.8 km/h;
    • on the second - 6.1 km/h;
    • reverse speed - 1.4 km/h.
  2. Movement speed when rearranging the V-belt drive belt:
    • in first gear - 3.3 km/h;
    • on the second - 12 km/h;
    • reverse speed - 2.5 km/h.
  3. Transport track:
    • without axle extensions - 320 mm;
    • with axle extensions - 565 mm.
  4. Turning radius - 1.1 m.
  5. Ground clearance - 145 mm.
  6. Operating temperature - -5...+35°С.
  7. The ignition system is electronic non-contact.
  8. The spark plug for the ignition coil is A-11-1, A-17B.
  9. Starting system: manual starter with pull cord.
  10. The running system is wheels in a 2x2 pattern.
  11. Tires - 4x10 model F-106.
  12. Tire pressure is 1.8-2 kg/cm³.

Operating characteristics of the tillage unit:

  • number of cutters - up to 8;
  • cutter diameter - 36 cm;
  • processing depth - 20-32 cm;
  • maximum working width - 120 cm;
  • processing speed - up to 0.12 ha/h.

Carburetor

The float-type carburetor of the Neva KMB-5 walk-behind tractor ensures the preparation of the air-fuel mixture, has a vertical mixing chamber arrangement, and is attached with 2 screws to the pipe through gaskets and bolts to the board. Fuel from a fuel tank with a volume of 3.6 liters, when the tap is open, flows by gravity into the device through the connecting hose and fitting, then through the fuel valve into the float chamber, is sprayed, mixed with air in the mixing chamber and approaches the combustion chamber of the cylinder block.


If there is a problem in the power system, adjust the carburetor by turning the screw 1 and 3/4 turns.

Fuel consumption

Fuel consumption for a walk-behind tractor is 1-1.6 l/h.

Dimensions

Overall dimensions of equipment:

  1. Length - 1640 mm;
  2. Width:
    • without axle extensions - 600 mm;
    • with extensions - 850 mm;
    • with cultivator - 600 mm.
  3. Height with wheels - 1200 mm.

Features of the internal combustion engine

Neva modifications are equipped as follows:

  1. Neva MB-2K is equipped with a domestic DM-1K engine with a long service life and low price.
  2. Neva MB-2B with an American Briggs&Stratton engine of varying power and performance.
  3. Neva MB-2S with professional Japanese installations Robin Subaru or Honda.


The engine on the Neva walk-behind tractor is a 4-stroke, 1-cylinder carburetor with manual start from the starter and air cooling. To transmit rotation to the gearbox or attachment mechanism, a three-groove pulley is used. The operation of the motor is regulated using an air damper.

The devices have an overhead valve arrangement, a horizontal crankshaft position and high torque.

They are characterized by the following features:

  • hull strength;
  • modernized air purification system;
  • manufacturing a crankshaft from forged steel and installing it on bearings on 2 sides;
  • presence of electronic ignition;
  • production of sleeves from durable cast iron;
  • installation of special channels for cooling in the block and head;
  • use of metal parts instead of plastic;
  • quick start due to a large bobbin in the starter and reduced compression;
  • small size and weight.

The most popular are American Briggs & Stratton units. They are durable, wear resistant and high power. Main disadvantage engines - high cost.

Gearbox

The gearbox for the Neva MB-2 walk-behind tractor is a gear-chain device designed to change the rotation speed of the output shaft or cultivators and transmit rotational motion from the driven pulley to the wheels of the walk-behind tractor, changing the speed and direction of movement.


Its performance is ensured by the presence of oil fluid in the housing. Parts are lubricated by spraying oil during disassembly.

The kinematic diagram of the device is simple: a chain and 2 sprockets - upper and lower. The lower, or driven, sprocket is located on the working shaft, due to which the system starts to move. The gear ratio increases the force on the cutters and ensures maximum penetration into the ground.

The transmission serves as a transmitter of energy from the engine to the wheels.

Options and attachments

The use of mounted and trailed equipment allows you to expand functionality walk-behind tractor. The following attachments are installed on the Neva MB-2 module:

  • plows;
  • hillers;
  • potato diggers;
  • seeders;
  • lugs;
  • and Neva;
  • rotary brushes.

The hiller for the Neva walk-behind tractor processes areas with plants to a depth of 80-120 mm and a width of 250-430 mm.

The walk-behind pump for irrigation has the following parameters:

  • productivity - 12 m³/h;
  • suction depth - 5 m;
  • water supply height - 30 m.

A snow blower is an attachment for removing snow. The productivity of such a unit reaches 250 m³/h, and the working width is 700 mm. When using a blade shovel, the working width is adjusted to 1000 mm.


As trailed implements, a transport trolley is used for the Neva walk-behind tractor with a load capacity of 150-250 kg.

Hitch

A hitch is a device with which attachments are attached to a walk-behind tractor. Its use makes it easier to work with a plow, hiller and other tools, and ensures a reliable connection.

The devices are U-shaped and can withstand heavy loads.

Milling cutters

The complete set of the walk-behind tractor includes additional cutters in the amount of 6-8 pieces to increase the soil coverage width in 1 pass.

The number of installed cutters depends on the engine power and the purpose of the module.

Application

According to the operating instructions, before turning on the walk-behind tractor, it is necessary to carry out preparatory work:

  • check all components and fastening connections for tightness and reliability;
  • familiarize yourself with the safety measures described in the manual;
  • check the engine oil level;
  • fill up fuel tank pure gasoline AI-95 or AI-92;
  • re-preserve the walk-behind tractor;
  • check the presence of oil in the gearbox;
  • inspect the tires.

Run-in

Run-in - important stage in the operation of any technology. If the process is carried out incorrectly and the walk-behind tractor is not properly maintained, its service life is reduced and the mechanisms become faulty.

Running in is carried out in light mode for 30 hours to grind in all parts.

The depth of soil cultivation reaches no more than 10 cm. Experts recommend carrying out this process without loads.

After break-in, you must perform the following steps:

  • make the first oil change;
  • check the strength of fastening connections;
  • adjust the belt for the walk-behind tractor;
  • check the operation of the left wheel release;
  • remove additional restrictive gaskets between the carburetor outlet flange and the pipe flange.

Cultivation

When operating a walk-behind tractor with a cultivator, you must adhere to the following algorithm:

  1. Place the equipment in a horizontal position and check the steering.
  2. Adjust the tillage limiter to the desired depth.
  3. Carry out cultivation with half-covered throttle valve carburetor
  4. When working in conditions low temperatures If the walk-behind tractor does not start, use the following method:
    • keep the equipment for about 10 hours in a warm room, then quickly turn it on;
    • Fill the engine with oil with a temperature of + 50…60°C;
    • warm up the carburetor pipe and the system itself by placing a rag soaked in hot water on them.

Advantages and disadvantages

Advantages of MB-2 walk-behind tractors:

  • simple operation and maintenance;
  • increased efficiency and service life;
  • operation at low ambient temperatures;
  • choosing the optimal speed;
  • wide range of mounted implements;
  • reliability and strength of components;
  • convenient transportation;
  • economical fuel consumption.

Disadvantages of MB-2 modules:

  1. Light-weight models have little pressure on the ground, so they work poorly.
  2. Heavy equipment weighs 98 kg, making it difficult to operate.
  3. Unstable on uneven areas, possible tipping over.

Prices in Russia

Prices for MB-2 walk-behind tractors depend on the power and country of manufacture of the engine, as well as technical condition. Equipment from the manufacturer can be purchased for 35-60 thousand rubles. On secondary market the cost of cars varies between 15-25 thousand rubles.

The first block of the Neva company was produced in 1984 in Leningrad at the Red October plant. The distinctive qualities of these units are: they are easy to operate, even a beginner can handle them. The units are unpretentious in maintenance and are highly reliable.

Basically, Neva units are designed for loosening any soil on personal plots and performing work that requires significant loads (transporting goods, harrowing, cleaning the territory).

Features, pros and cons

The Neva MB 2 walk-behind tractor is one of the most popular units of this type. Differs in versatility, has excellent specifications. Ideal for working in private farms, vegetable gardens, and orchards.

There are engines with markings:

  • Motoblock Neva M-2K;
  • Model 2K.

The letter “2K” means that the walk-behind tractor has an engine made in Russia, it has a good resource and an average price. The single-cylinder engine has a power of 6.1 and 7.6 liters. With.

Much depends on what kind of unit it is: DS 1 or DS 2. The first can run on 76-grade gasoline, DS 2 requires 95-grade fuel. On average, gasoline consumption is about three liters per hour if the walk-behind tractor is almost 100% loaded.

The walk-behind tractor with the letter “2B” has an imported power plant(most often Briggs & Stratton). Such mechanisms are considered to be the most reliable. Model "2C" on such models there is a Japanese engine "Subaru" power up to 7.1 l. With. Diesel options have more power.

Japanese technology requires correct settings, only then will it work without failures. Before buying a Neva walk-behind tractor, you should understand what kind of work it will do.

If the plot at the dacha is too large, more than 16 acres, then the engine should be chosen at least 9-10 liters. With.

"Neva MB-2" is fixed on the frame, where you can also arrange various equipment. The power plant is equipped with a gearbox with six gears, this is a significant help in processing even the most dense soils.

The machine can move at speeds of up to 10 km per hour, and even large heavy loads can be transported. The walk-behind tractor has four speeds, 2 of them are rear. The controls are very convenient, mounted on the steering wheel.

The V-belt drive can quickly rearrange the pulley, lever and belt. The unit is well equipped; there are cutters for a wide variety of purposes.

The device weighs only 99 kg and is compact in size. It can be transported over long distances in the trunk of a car.

The machine can do the following work:

  • plow;
  • sow;
  • to harvest;
  • serve in public utilities;
  • work like a pump.

Main parameters:

  • depth of penetration into the soil up to 21 cm;
  • the grip can be realized up to 130 cm;
  • The set includes 6 cutters;
  • turning radius 112 cm;
  • cutter diameter 37 cm;
  • traction force 172 N;
  • dimensions LxWxH, meter – 1.75 by 0.66 by 1.4;
  • operation is permissible at temperatures from – 26 to +39 degrees Celsius.

In the cold season, it is necessary to drain the “summer” oil and fill in the “winter” oil. It is unacceptable to use the wrong oil, this will lead to damage to the unit, the same statement applies to fuel. American power plants are extremely picky about the purity of gasoline. It is better to filter domestic fuel before pouring it into the tank of a walk-behind tractor.

The unit service package includes:

  • running in the engine and tuning it;
  • adjustment of gearbox and transmission;
  • adjustment of attachments;
  • preventative maintenance and testing;
  • timely oil change.

Device

The power plant has an overhead valve arrangement, the crankshaft is located in a horizontal position, which allows it to create significant torque. Motoblocks "Neva" for the most part are equipped with this particular unit produced in St. Petersburg. The second most popular is the unit from Subaru (Robin-Subari EX21), which also has a power of 6.6 liters. With. Motoblocks "Neva" are mounted with Briggs Stratton engines (power 5.6 hp).

Domestic walk-behind tractors with a DM-1K engine can have modifications of 6.2 and 7.5. The first is oriented on 76 grade unleaded gasoline, the second is designed for 92 grade gasoline.

Over 35 years, many different modifications of Neva walk-behind tractors have been produced, however, the main spare parts of the unit are standard, which makes maintenance easier; spare parts can always be found on the market. The bearings are reliable and ensure smooth operation of the gear. The decompressor operates automatically and is an integral part of the unit. Air filter has two assembled blocks.

The engine consumes a small amount of fuel, creating a small amount of noise. The spark plugs ensure uninterrupted ignition operation; the engine can be started even in conditions of high humidity at any temperature.

"Neva MB 2" has dimensions:

  • length 1742 mm;
  • width 652 mm;
  • height 1310 mm.

The track width is 322 mm; if you take into account the axle extensions, the size can reach 570 mm. The ground clearance of the walk-behind tractor is 142 mm. The cutters have a diameter of 36.2 cm; tillage in depth can reach 22 cm.

Additional cutters can be attached to the walk-behind tractor, bringing their number to 8 pieces. This unit can process 0.11 hectares in an hour.

The gas tank volume has one tap and is 3.5 liters. Average fuel consumption is 1.5 liters per hour. The engine is four-stroke, one cylinder. The power plant starts to work from the starter. Communication with attachments is provided through a three-row pulley; at the beginning of engine operation, control is carried out using an air damper.

The engine is bolted to the frame, and the tires are pneumatic. Attachments and accessories significantly expand the functional range of the walk-behind tractor, increasing the efficiency of the unit. Sometimes weights are used for better balancing and increased efficiency..

In total, there are more than two dozen varieties of this unit; for more efficient coupling with non-standard attachments, special adapters are used.

Models

"NEVA MB2 MultiAGRO"

This new model, which can rightfully be called one of the most successful. The unit stands out from the line due to its rich functionality, as well as good engine Briggs & Stratton, which belongs to a separate Vanguard series. Supplemented with an excellent gearbox with original characteristics.

The engine resource is designed for five thousand hours, which is a record among power plants of this class. The walk-behind tractor has two forward gears and one reverse gear. The traction force is about 142 N, which allows you to work on virgin soil and transport heavy loads.

The walk-behind tractor has a single-cylinder four-stroke engine. Is different economical consumption fuel and oil. Any attachment is suitable for this walk-behind tractor.

Set:

  • walk-behind tractor "Neva MB-2B-6.5" 1 pc.;
  • cutters 4 pcs.;
  • wheels (4.6x10) 2 pcs.;
  • axle attachments 2 pcs.

"NEVA MB2 B"

6.5 l. With. Suitable for a wide variety of jobs. Such a unit is indispensable in auxiliary communal services. This walk-behind tractor is equipped with a four-stroke Vanguard engine, in which There are a number of original improvements:

  • more modern carburetor layout;
  • the gearbox has several additional stages;
  • there are big wheels.

The processing strip is 82 cm; if additional cutters are installed, the strip increases to 126 cm.

"Neva MB-2N GX200"

Makes it possible to cultivate the soil and clean streets and squares. The power of the unit is enough to cultivate virgin lands.

The gasoline engine is from Honda, has a cast iron body, and has a power of 4.2 kW. The machine has increased traction parameters.

"Neva MB2 GX-200"

It cannot rightfully be called a heavy unit. Maneuverability, maneuverability and power are noticeably above average.

The unit is distinguished by its unpretentiousness and high productivity. Maneuverability is achieved by locking the wheel. You can install eight cutters, the track width can be up to 172 cm. It can be combined with any attachments.

Characteristics:

  • the weight of the device is just over one hundred kilograms;
  • the fuel tank holds up to 3.2 liters of gasoline (92 or 95);
  • there are two gears;
  • the soil can be cultivated at a depth of 21 cm;
  • shaft revolutions in first gear are 22-43;
  • shaft revolution in second gear 88-161;
  • The gearbox is enclosed in an aluminum housing.

"Neva MB 2S-7.5PRO"

Another popular walk-behind tractor model. The machine is distinguished by its ability to work in any weather and temperature. The gearbox has a chain and gears, which contain a double-groove pulley. The device is very maneuverable, its wheels work autonomously. There is a function to turn off one of the wheels. The ground can be processed with eight cutters, the working width is 171 cm.

The equipment is capable of performing almost any job, characteristics and types of work:

  • cleaning the area;
  • transportation;
  • harvesting root crops;
  • mowing;
  • with Subaru engine;
  • the amount of fuel in the container is 3.5 liters;
  • total weight 101 kg;
  • aluminum body;
  • width of cultivated soil 171 cm;
  • processing depth 21 cm;
  • shaft revolutions 22-43 (1st gear) 88-161 (2nd gear).

"Neva MB 2S-6.5PRO"

This is a classic unit that has proven itself from the best side. "MB 2C-6.5PRO" is versatile and can work with any soil. Power is 4.7 kW (6.4 hp). It is possible to install up to eight cutters; the width of the cultivated soil strip can reach 172 cm. It is distinguished by high maneuverability even during high loads.

You can change the speed by moving the pulley. It is possible to block the left wheel, which makes the unit more maneuverable when turning.

Main characteristics:

  • suitable for transportation;
  • cultivation of all types of soil;
  • public works;
  • power in horsepower 6,1 (4,5);
  • the tank holds 3.5 liters of gasoline;
  • the device weighs about a hundredweight;
  • two forward gears and one reverse gear;
  • gasoline 92 and 95.

"Neva MB 2B-6.5 RS"

This walk-behind tractor is equipped with a gasoline engine from the Briggs&Stratton I/C series. This is one of the best units that can successfully cope with the most complex tasks, performing almost any type of agricultural work, the soil may be different. Designed for processing medium and large sized areas. Additionally, the walk-behind tractor has an electric starter and headlights. It features increased performance, the engine is 6.21 liters. With. (4.5 kW).

The unit has good functionality, reliability, and the mechanism can withstand heavy loads.

Main advantages:

  • you can work in different gears, the pulley is simply redirected to the second cell;
  • there are unlockers, they are provided with maneuverability by the mechanism;
  • there is a light source, which allows you to work in the dark;
  • fuel capacity 3.9 liters;
  • weight 98.5 kg;
  • two gears - forward, one reverse;
  • engine capacity 204 cc. cm;
  • fuel – gasoline 92 and 95;
  • width of the cultivated strip is 85-128 cm;
  • shaft speed 22-43 and 88-162;
  • immersion in the ground up to 21 cm.

Can be used for:

  • public works;
  • harvesting;
  • transportation of goods;
  • irrigation.

Attachments

The most popular attachments are hillers and plows. The first is necessary to add soil. A plow is also needed to cultivate the area.

The potato digger (KHM) can dig up root crops at a depth of up to 225 mm. Strip processing width 26 cm. Dimensions 562x372x542 mm Weight up to 5.5 kg.

The CB 1/1 hitch weighs only 5.4 kg, dimensions 436x132x176 mm and works with the following units:

  • hiller;
  • potato digger;
  • lugs Ф342х112 mm;
  • the mower for the Neva walk-behind tractor can cover a strip up to 1200 mm wide, the height of the grass that the unit can mow is 42 mm;
  • snow removal equipment;
  • potato planter;
  • reversible plow;
  • snow blower;
  • wide rake.

User manual

The walk-behind tractor and attachments require regular preventative maintenance. Most units have imported power units; they should be repaired in service centers. On your own, you can only drive the unit to Idling, pour fresh oil into it.

Five hours will be enough to start the engine and warm it up. However, it is not recommended to subject it to heavy loads at the very beginning.

For the first few days, the walk-behind tractor will only need to be loaded at 50% so that all components are properly grounded. After these procedures, the oil is completely drained and washed with a special composition. Afterwards the good stuff is poured in semi-synthetic oil 10W30 or SAE30 in 650 ml size.

The amount of oil for the Neva will be approximately one and a half liters. If the engine starts to stall and smoke appears, then you should send the unit to a service station; it’s better not to disassemble anything yourself.

Carburetor adjustment is done on the Neva unit at the factory.

If the engine has been in operation for more than one year, then the following actions should be performed.

  • The screw on the carburetor, which is responsible for the composition of the mixture, is tightened as far as possible; this will lead to a maximum increase in the fuel content in the combustible mixture.
  • The engine starts, the mixture becomes lean, the screw is turned out, which regulates the amount of mixture. Thus one can find optimal mode work. All these operations can be done when the spark plug of the walk-behind tractor is clean; it must be in normal working condition.
  • The unit should sometimes be “driven” at high speeds, no more than ten minutes, after such operations the engine will work better.
  • If the centrifugal regulator has shifted, it will need to be returned to its original position. To do this, unscrew the M8 nut and pull the damper all the way to the left. This location should then be secured.

Sometimes the belt slips off the pulley. If you follow the instructions, you will need to adjust the tension mechanism. Often the old belt is simply removed and a new one is put in its place.

The pulley is adjusted in this way:

  • the engine is secured with bolts;
  • by adjusting the bolts you can tilt the engine in the desired direction;
  • look for the desired location when the belts are tensioned correctly.

Checking the belt tension is very simple: just press with your finger to understand how much it deviates. Usually a deviation of about one centimeter is sufficient.

The plow is also adjustable. The setup is done in two phases: the walk-behind tractor is placed on the load hooks, and two pads are placed under them. The unit is fixed without deviation. Then the Neva plow is adjusted in such a way that the bar is close to the soil, the stand should be vertical.

To make a universal hitch using two nuts, you can only find the desired angle empirically; you will have to do several tests. At the end, the angle of the dump of earth that comes out from under the cutting edge is adjusted. A simple operation, it is done simultaneously with the adjustment of the rack itself.

You will learn how to replace the belt on the Neva MB 2 walk-behind tractor in the following video.


Farming is a variety of agricultural work involving cultivating the soil, as well as caring for animals. This is a great way to provide your family with healthy and environmentally friendly products, as well as be able to sell vegetables and fruits and make money from it.

All farmers know how such work can be exhausting and even harmful to health. But we live in an age of technological progress, which means there is always special equipment on sale that makes the lot easier for everyone who owns large plots of land. Of course, such equipment will simply be unprofitable for those who have a garden of only about 2-3 acres, but those who own hectares simply cannot do without special machines.

In this article we will talk about the design of the gearbox - one of the main components of the Neva walk-behind tractor. About how to choose it and how to repair it if any malfunction is detected.

Types of gearboxes

According to their purpose, gearboxes are divided into the following types:

  1. Geared. The gear in them is in the form of a cylinder and a cone, and it is mounted on special shafts. According to its design, such a gearbox can operate in a straight line or in an angular pattern;
  2. Gear-worm. They are used when the engine crankshaft is vertical. This model includes a worm gear. Turns are performed at an angle of 90 degrees;
  3. Chain. A metal chain is used, which turns the sprockets;
  4. Belt. This is an analogue of the chain type, but here instead of a chain a belt in the shape of a wedge or rectangle is used, and sprockets are replaced by pulleys with profile grooves for fixing the belt.

Monoblock and reduction gear

It is quite possible to create a reduction gearbox for a monoblock with your own hands. They are used for modern monoblocks. Thanks to such gearboxes, the walk-behind tractor can be operated on difficult soils. It is necessary when the wheels slip and the vehicle does not have enough strength.

The design of the monoblock gear reducer directly depends on the design of the transmission. It moves the turning torque from the engine to the wheels, sets optimal speed and the direction of movement of the walk-behind tractor. The transmission device includes a gearbox, differential, gearbox and clutch. The gear type transmission has gears in the shape 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: a coupling is located between the opposite gears in the shape of a cone. When it comes into contact with the spokes on the gears, the direction of rotation changes. Please note that the gears must be in the form of spirals.

Gearbox products

Please note that you must not forget to change the oil in the gearboxes. If you miss this point, after some time the additives lose their properties. To increase their service life, their characteristics must be protected with oil. Failure to replace it in a timely manner may cause the product to foam, resulting in the gearbox jamming.

Before changing the oil, you need to check the previous level, then remove the oil dipstick and clean it with a soft cloth. The monoblock gearbox should be filled with oil at a medium level.

Oil is the key to long-term operation of the gearbox. When looking for the best product, be sure to read the instructions. It is important to consider the conditions under which it will be used. The most popular oil is the Motul brand, which is used by almost all owners of walk-behind tractors.

Gearbox of the Neva walk-behind tractor

Gearbox of the Neva walk-behind tractor - design and features


For walk-behind tractors, you can purchase a variety of attachments that allow you to perform different jobs - from plowing the land to sweeping the area and mowing lawns. All these tools move thanks to the walk-behind tractor gearbox.

We will look at the design of the gearbox for the Neva. It is necessary to transmit the rotation of the motor to the wheels and any attachments. It sets the direction of rotation and gear ratio. In principle, the gearbox for the Neva walk-behind tractor is no different from any other device. They are all very similar.

The gearbox is designed in such a way that on the upper part of its housing there are elements for shifting gears. The gear lever has five positions. When the lever is pressed, the fork releases the clutch from the clutch, and vice versa - when the lever is released, the fork returns back.

The walk-behind tractor will slow down when the drive is connected to the right axis. The torque comes from the sprocket located near the input shaft. When the lever is pressed, the left sprocket engages and a downshift is engaged. When the handle is pushed to the limit, the highest gear will engage.

Possible breakdowns of the gearbox of the Neva walk-behind tractor

Oil must be poured into the gearbox of the walk-behind tractor. You need to make sure that the oil level is sufficient. Many people wonder what kind of oil to fill in the gearbox. It is important that it is of very high quality and from a reputable manufacturer, so that the entire system works properly and lasts a very long time.

To repair the gearbox, it is necessary to disassemble it. But first you need to clean all the dirt and drain the oil. After this, careful disassembly is carried out and the origin of the breakdown is found. You can visually inspect each component and find breakdowns, or mechanically test the parts. If you discover a breakdown and you need to replace one or another component, be sure to buy and install only new parts and only genuine ones, if, of course, you value your unit. Changing the oil in the gearbox of the Neva walk-behind tractor is a mandatory and final step in the repair process. If you don't do this, the device will simply fail.

Possible breakdowns:

  1. Oil flows along the shift shaft. It may not even be necessary to repair the gearbox. You need to first check the presence and quantity of oil. After this, you can replace the oil with new one and drain the excess. Another reason is cuff wear. To do this, you need to carefully examine the device and replace the damaged part;
  2. Oil flows through the output shaft. This also requires cuff replacement. The origin of the breakdown is wear of the axle cuff edge;
  3. There is no kinematic connection inside the gearbox. This comes from a sprocket break in the block. To repair the gearbox in this case, you need to completely inspect it and replace all faulty sprockets;
  4. The gearbox is jammed. You need to study it and replace the broken circuit;
  5. Gears will not engage or shift. There may be several reasons for a malfunction here. The first is that the switching pin is damaged. The second is that the thread of the gear shift knob is cut off. You can fix the damage on our own by simply replacing parts.

It should be noted that you will not need gearbox repairs for a long time if you use high-quality oil, monitor its level and change and fill in new ones on time, and also operate the equipment carefully, without overloading.

Failure of the gearbox of the Neva MB-2 walk-behind tractor

Correcting Neva MB2 gearbox breakdowns is practically no different from other models, but there are still some points that need to be mentioned. Our advice will help you not only identify the problem, but also decide whether you can repair it yourself or whether you will need to call a professional.

  1. The crankshaft has stopped rotating. Repair is definitely needed here, since the reason may lie either in the destroyed ratchet body or in the ratchet clutch. You must examine and unscrew the device and replace all damaged elements;
  2. White smoke began to come out of the muffler when you turned on the equipment. The electrodes of the spark plug may remain dry, but they are covered with a white coating. The reason is a lean mixture. To fix it, you need to adjust the carburetor;
  3. The engine suddenly starts to slow down and stops altogether. Your engine may simply be overheated. You need to stop work and do not turn on the equipment until it has completely cooled down. You also need to check the oil level and clean the surface of the block and cylinder head from dirt.

Simple operating rules allow you to avoid any breakdowns. If they do arise, you should definitely study the operating instructions, where you will find answers to any questions. It will also describe in detail all types of breakdowns and how to fix them. This must be done, because for different models walk-behind tractors, the methods for finding and fixing the problem may differ to some extent.

What does the gearbox of the Cascade walk-behind tractor consist of?

In order to disassemble the gearbox of the Cascade walk-behind tractor, you first need to remove it from the walk-behind tractor. Then you need to remove the covers, then remove the screws and tap to remove the cover. Remove the input shaft bushing, remove the shift lever and shift fork. Remove the input shaft with the gear on it. Remove the shaft from the bushing and remove the chain from the shaft. After which it is necessary to remove the shaft block itself. Take out the sprocket block. Remove the intermediate shaft with gears. Remove the right axle shaft, clutch and left axle shaft.

The gearbox consists of the following main parts:

  • covers;
  • pulley;
  • bearings;
  • bushings (input shaft);
  • shift lever;
  • intermediate shaft gear;
  • shift axis, shift fork;
  • input shaft with gear;
  • shaft block;
  • double-row chain;
  • connector, small circuit;
  • sprocket block;
  • intermediate shaft with gear;
  • input shaft;
  • washers;
  • oil seals;
  • right axle shaft;
  • double star;
  • clutch;
  • left axle shaft;
  • clutch fork;
  • bracket;
  • spring.

The influence of oil on the operation of the gearbox of the Cascade walk-behind tractor

Particular attention should be paid to the lubricating fluid and oil. It is worth noting that the oil must be changed every 50 hours of operation of the walk-behind tractor. Also, you should not heavily load the walk-behind tractor, as this can lead to rapid wear of the equipment. Do not forget that installing additional cutters with your own hands is undesirable. The gearbox chains suffer greatly from additional loads (the bushings burst), after which the chains begin to jump. Under strong lateral loads, the support washer quickly wears out, as a result of which the alignment of the two gears is lost and the bushings fly off the chain. The conclusion can be drawn as follows: you do not need to work on the walk-behind tractor at an angle; despite cleaner work, you are harming your unit and you should turn the walk-behind tractor more carefully when working.

The oil change is carried out as follows:

  1. First, we place the walk-behind tractor on a flat surface and find a rod about 70 centimeters long.
  2. We bend the rod into an arc and insert it into the filler hole of the gearbox through the entire body of the gearbox until it stops and stick the rod out.
  3. Next, look at the oil level in the gearbox. Ideally, the oil should be filled to at least 25 cm. Then either add oil (1.5 liters) or pour oil into the dry gearbox (2 liters). The oil must be filled as specified by GOST; in addition, it is permissible to mix different types of oils in any ratio.

Replacing the oil seal in the gearbox of a Cascade walk-behind tractor

Next, we will outline how to replace the oil seal on the gearbox of a Cascade walk-behind tractor. Replacing the oil seal occurs as a result of leaks, which will lead to rapid wear of parts, because the gearbox will operate dry, i.e. no oil. The main reasons for oil seal failure are: a shaft with burrs or roughness that wears down the oil seal; deformation of the oil seal due to improper installation; poor workmanship; the spring that tightens the edge is weakened; and just wear and tear. In order to replace the oil seal, you first need to clean the dirt, then pull out the oil seal with a catchy movement, after which, using a suitable socket head, you need to drive the new oil seal until it stops lightly, lubricating it with machine oil. However, if there is metal protection, then it is necessary to disassemble the gearbox.

How to do it yourself?

If you have access to a huge selection of necessary spare parts, then, of course, it is easier to make gearboxes yourself. But please note that such a spare part requires serious metal processing equipment. If you have this, then you can choose a housing with optimal parameters, make holes for the shafts on the bearings and make the device no worse than at the factory.

The completed gearbox requires determination of its operating conditions, including the load. Its operation will be top level, if you choose the right temperature and lubricant. The next step is to assemble the gearbox. The case can be taken from the factory. According to its diameter, you can determine the bearing housing for the shaft. A caliper and a drill will help you with this.

A steel flange must be mounted on the front side of the gearbox. Inside we mount a flange bearing and a washer. The flange is secured with screws at the generator itself. The key and gear must be selected in advance. All components that are in contact with the transmission system are fixed to the rotary generator.

Motoblock "Neva"

Secrets of operation, maintenance and repair.

Transmission of the Neva walk-behind tractor

The transmission performs the function of transmitting torque from the engine directly to the chassis or to active attachments.

The transmission of the Neva walk-behind tractor consists of a V-belt drive with a tension roller and gearbox. A similar design is used on most cultivators and universal walk-behind tractors. It captivates with its simplicity, reliability and low cost.

For example, in the event of a sudden stop of the transmission shafts when the cutter rests on a solid object, the belt simply begins to slip along the pulleys, protecting the engine and transmission mechanisms.

In the design used, the torque of the motor through a pulley system located on crankshaft, And V-belt transmitted to a gear-chain reducer. The belt tension is ensured by the tension roller when the clutch lever is depressed.

Thus, the engine sets the rotation of the gearbox input shaft using a belt drive, which in this case also acts as a clutch. Gear and chain transmissions are combined in a single housing.

The crankshaft of the Neva engine walk-behind tractor is located parallel to the axis of the drive wheels, that is, horizontally. There is an additional stream on the drive pulley to enable power take-off.

Gearbox design of the Neva MB 2 walk-behind tractor.

Gearbox walk-behind tractor Neva

The gearbox of the Neva walk-behind tractor transmits torque from the engine directly to the wheels. The gearbox also determines the gear ratio and sets the direction of movement of the unit.

Unique sealed gear-chain design gearbox, made in an aluminum body in an oil-filled bath, provides a traction force of more than 180 kgf, which allows you to achieve the highest performance when working even on heavy soils.

Motoblock Neva MB2 Reducer: device, disassembly-assembly, repair

Neva walk-behind tractor gearbox MB2 produced in 1998, never repaired before. Reason for revision gearbox: elevated.

Device The gearbox of the Neva walk-behind tractor contains a set of gears with a lever for changing speeds, providing 2 forward and 1 reverse gears.

Important feature motoblock Neva is the presence of a mechanism for separating the axle shafts, which is built directly into the gearbox. This allows you to connect the drive from the engine to only one right axle shaft and, thereby, deploy the walk-behind tractor almost on the spot with a turning radius of approximately 1.1 m.

Basic transmission parameters walk-behind tractor Neva mb2:

Gearbox design of the Neva 2 walk-behind tractor.

  • The volume of the gearbox housing is 2.2 liters of oil;
  • traction force reaches 180 kgf;
  • number of speeds – 4 forward speeds and 2 reverse (changeable by rearranging the belt on the pulley);
  • U-turn on the spot with the left wheel unlocked.

The speeds of a walk-behind tractor with such a transmission are respectively 1.8; 3.3; 6.1; 12 km/h in forward gears and 1.4; 2.5 km/h in the rear.

In variety motoblock Neva MB-3 design of a kind of gear-chain reducer allows you to select 3 forward gears and 1 reverse gear. Wherein maximum speed is 2.7 in first gear; on the second 5.1; in third 9.9 and in rear 3.5 km/h.

Advantages of the transmission of the Neva MB-2 walk-behind tractor

The use of this type of transmission compared to the previous MB-1 model provides in practice:

  • the traction force (the leading parameter for this type of equipment) of the Neva MB-2 walk-behind tractor is 1.8 times greater than that of the MB-1 walk-behind tractor, which guarantees high-quality work on any soil;
  • the highest torque at a low speed of 1.8 km/h allows, in addition to agricultural work, to use this unit in conjunction with a mower or snow blower;
  • high speed of transportation of heavy loads weighing more than 400 kg up to 12.5 km/h;
  • the ability to use 8 milling cultivators, which significantly increases work productivity and saves working time;
  • Thanks to the presence of a semi-axle release located in the steering-controlled gearbox, it is significantly easier to control the walk-behind tractor in small areas of any configuration.

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