Features of repair of motor-blocks "Neva"

Motoblock "Neva" is widely used in country dachas, mostly for planting seasonal vegetables. In this light, this device is indispensable for the arrangement of landscape design and decoration of gardens and house plots. Serial production of units "Neva MB 2" and "Neva MB2K" was introduced in the second half of the 1980s, since then many gardening enthusiasts do not part with this device.

The device "MB 2" is very popular nowadays; it is simply irreplaceable in agriculture. This line of compact motoblocks is produced under the same brand, but has a difference in the engine:

• "Neva" with a 2K index is equipped with a domestically produced motor, so the price of such a device is much lower than that of foreign counterparts;
• the second 2B abbreviation indicates that this mini-tractor has an imported engine;
• abbreviation 2C denotes professional elements in the structure of the apparatus, which are used for tillage.

The characteristics of the motor should be taken into account when choosing a unit in order to successfully process the required amount of land, be it a dozen acres of land or much more area. The design of the unit is the following system.

• The gear chain type reducer is located in a specialized case, which is made of aluminum. Its main task is the high speed of the unit. The apparatus has four forward gears and a pair of reverse gears to carry out a coup. Its maximum speed is 12 kilometers per hour, so this device can even be used to transport goods.

• This small tractor uses a starter motor to start.
• The frame, which acts as a support, has special fasteners, which are located at the back and front and are used as devices for working on weight.
• There are certain levers on the steering device that are used during the operation of the mini-tractor.
• The V-belt type transmission produces the transmission of the clutch assembly from a pulley, a special lever and a V-belt.
• The unit is compact and light, even a very heavy version weighs only 97 kilograms. This unit is easy to deliver anywhere, even in a regular car.

The unit with the abbreviation MB 2 has tremendous capabilities; it can perform a large amount of work in agriculture, such as: land plowing, cultivation, planting seeds, the process of hilling and weeding between rows and harvesting. All this "Neva" produces with the help of a large selection of equipment, which is used in a hinged form, as well as thanks to a large number of innovations. Features of the technical plan are presented by the device "Neva" MB 2 as follows:

• it is recommended to refuel the unit only with gasoline;
• power equipment 7.6 liters. with.;
• Russian engine DM-1K, 4-stroke engine with a single cylinder;

• there is a motor with a volume of 317 cubic meters;
• the engine is started manually;
• air and liquid cooling;
• tank volume 2.8 l;
• gear editor, chain;
• fuel consumption is 2.9 liters per hour.

Other salient features are:

• during cultivation, the grip is 160 cm;
• the depth of the earthen plot is 16-26 cm;
• tractor length 1750 mm, height 1350 mm, width 630 mm;
• about twelve acres per hour is able to work out this mini-tractor.

The owner of the territory of the dacha, purchasing the device "Neva", already becomes the owner of a fully assembled and ready-to-use device, but in order to start working with it, it is necessary to adjust the main components, for example, the fuel system and the engine. The valve system settings will allow the engine to start and function smoothly. To do this, disassemble the carburetor and unscrew the screws from the upper and lower housing and clean all these elements. Only then is it recommended to start changing the setting of the motor valves. First of all, the screws are screwed in to the end to adjust the gas to the minimum limit, after which they are unscrewed and the engine itself is started.

It should be remembered that before fixing something in the valve system, the engine warms up for about five minutes. After that, the lever is set to the lowest position, this will maintain stable rpm. After that, the motor is tuned at the minimum speed, when it works stably and without interruptions. By following the tips for using the device, you can extend its life for a long time.

• The direction of the legs should be observed, which should be located in the direction of the movement of the apparatus when installing the device used for cultivation.
• Additionally, load connection should be carried out if the wheels slip during operation, when the apparatus is in reverse.

• It is correct to use only clean and high quality fuel.
• The use of a damper adapted to cut off the air supply when an unheated apparatus starts to work. If the motor is hot, then this element should not be closed.
• After starting from the throttle position, position XX is set, after which the engine should be heated for three minutes. When warming up the motor engine, it is prohibited to set the number of revolutions to the maximum.
• Oil must not get into the element that filters the air, this must be monitored.
• Before using the device, you should read the instructions and carefully study them.

To the main features of temporary malfunctions of motor-blocks of the brands "Neva MB 2" and "Neva MB2K", in which beginners usually "swim", should include the following.

• The valve belt is incorrectly adjusted, it flies out. Back and forth movements in the walk-behind tractor are carried out using a V-belt. If the drive belt slips off, the unit will not work correctly. You can determine the desired length and width by measuring the segment from the pulley to the rollers. It is recommended to choose the following parameters: width - 0.75 cm, length - 0.65.
• The device stalls under high load. Improperly functioning oil seals can cause damage.

• Incorrectly tuned carburetor system, the unit will not start. Always adjust the centrifugal regulator using the supplied instructions before performing this procedure.
• Ignition not exposed, gears are poorly included. The cause of a breakdown may be the absence of a spark, which provokes the ignition of the fuel in the internal combustion chamber.
• Malfunctions with candles, the muffler shoots and smokes, there is black smoke. It is possible that the unit cannot continue to work precisely because the candles are faulty, you must make sure of this.

In the first case, in order to carry out repairs, you need to tighten the belt and first remove the casing. Next, loosen the tension screw of the standard belt part and move away all the screws that hold the bracket on the unit body. Remove the old part and adjust the seams. The area for the new part should be cleaned and blown out.After the new belt is installed, it is necessary to check that one part of it should be connected to the shaft, and the other to the pulley.

The actions to replace the gearbox oil seals are carried out in several stages. First, the cutters are removed from a part of the shaft, then it is cleaned and the cover is cleaned from dirt and the remaining oil liquid. Remove the screws from the roof and wash them well. The old part is replaced with another one and the mechanism is wiped everywhere. The cover is put in place and fixed with special bolts.

The carburetor setting begins with the fact that the bolts are tightened to the maximum, after which they are turned out 1.5 turns. The damper, which is of a throttle type, is installed in such a way that between the base and the air duct there is a certain free section of the required parameters. Then they try to start the engine again. Provided that the engine was started, then you should proceed step by step: you should wait until it warms up, then the control handle is set for a small turn, it is necessary to make small turns at idle, using a screw, which is a throttle. The turns are set to maximum speed and the idle propeller is used. These two steps should be repeated before starting the motor running smoothly.

To adjust the ignition block, you must first adjust the shaft, which must be turned so that the marks that were made on the pulley and on the gas equipment coincide with each other. The slider responsible for the propagation of gas flows must be directed at the wire through which the high-voltage current of the form passes. After that, loosen the nut and take out the high-voltage wire from the cover of this circuit. The contacts are placed in a small section, about half a centimeter from the mechanism. Next, you should wrap the ignition and turn the structure in the opposite direction. After sparking, tighten the screw quickly.

To check the spark plug serviceability, you need to unscrew the plug element, clean the electrodes and remove carbon deposits. The crankshaft should be turned over to the position where the marks of the pulley and the gas device match. The slider is directed to the high-voltage surface of the cylinder and the screw is loosened, the wire is taken out. The ignition key should be turned, if there is no spark, then the spark plugs are faulty and must be replaced.

For information on how to repair the gearbox of the Neva walk-behind tractor, see the following video.