Do-it-yourself cultivator carburetor repair

In detail: do-it-yourself repair of a cultivator carburetor from a real master for the site my.housecope.com.

Motoblock Mole is a means of small-scale mechanization, designed directly for working with the ground. Its great popularity in our country is due to the fact that, at its low cost, it shows quite good technical characteristics.

However, in order for this walk-behind tractor to continue to work correctly, you need to periodically maintain it.

These measures can significantly extend the operating life of the unit, without losing its performance.

One of the types of such service is carburetor adjustment, which must be carried out immediately after the end of the first season of work.

Motoblock Mole is a fairly typical design without the use of frills. This model of a walk-behind tractor began to be produced in 1983 in Moscow, but then the production of this unit expanded, so they began to be produced also in Omsk.

They were equipped with factory engines, the power of which did not exceed 2.6 hp. It is attached, like the gearbox, to the frame with ordinary bolts. The declared power was not always enough, so many owners of Krotov adapted to some alterations, changing the factory engine to more powerful models.

In general, the device of the Mole walk-behind tractor looks like this:

Frame structure on which the combustion engine and gearbox are located.
The control levers, on which the clutch are located, as well as the engine speed governor.
A wheelbase that allows the unit to move freely from place to place. During operation, these transport wheels are retracted.
Rotary tillers that fit onto the gearbox output shafts.

Video (click to play).

For more details about the Mole walk-behind tractor, see the video:

As we can see the design is very simple, which allows you to independently carry out repair work. And you may have to do this, because the factory engine does not always work in a stable mode.

The principle of operation of the Mole walk-behind tractor is as follows. The torque is transmitted to the gearbox, and then to its two outgoing shafts through the V-belt. When the clutch is pressed, the belt is tensioned, driving the gearbox shaft.

This gearbox shaft, on which the cutting elements (soil milling cutters) are located, rotates around its axis, cutting off the soil crust, at the same time crushing and mixing it. Similar translational movements are carried out by the movement of the walk-behind tractor along the surface of the earth.

The set includes four rotary tillers, which need to be arranged in pairs, on each side of the shaft. By the way, it is possible to install six cutting elements at once, which improves the quality of the land cultivation.

Mole

The scope of this and other motoblocks, such as the Cayman, Patriot, Texas, Foreman, Crossser, Viking, Forza, can be significantly expanded if you attach additional attachments to it. It is attached to the unit through a special bracket located at the back of the walk-behind tractor.

Such equipment will have to be purchased separately, but thanks to it, an expanded scope of work opens up:

transportation of goods of various weights;
processing of inter-row spaces of beds;
hilling and weeding of beds;
making hay for livestock;
planting and digging potato tubers;
using a pump, you can water the beds, etc.

In other words, with the help of a walk-behind tractor Krot, Sadko, Don, Hooter, Profi, Plowman, Champion you can carry out virtually the entire list of agricultural work. This circumstance makes him an indispensable assistant for a villager who uses his garden to the fullest.

Many people ask the question - how to adjust the carburetor installed on the Mole walk-behind tractor? Many people point out that this particular work node causes the most problems. The thing is that on the Mole the Soviet carburetor K60-B was also installed, which is used in the construction of mopeds.

Carburetor

The carburetor of the Mole walk-behind tractor was made in Soviet times... Despite the fact that the Soviet industry was famous for its high level of performance and reliability, this carburetor still had several flaws. To understand them, you first need to make a complete analysis of it into its components:

Remove the cover by unscrewing the bolt on it. Under it, we find a gasket made of a gas-resistant material, as well as a spring that must be pulled out.
We take out the flap, which is in the same place, under the lid.
On the reverse side there is a float chamber, which also needs to be unscrewed. Remove the gasket.
Then it is necessary to remove the float by removing the pin from the corresponding hole. There is a special needle under the float, which also needs to be removed. On it we find a small elastic band, which in no case should be lost, so we carry out all the manipulations extremely carefully.
We unscrew the fitting, under which the gasoline filter is located.
Then you need to remove the jet. After that, we need to pull out absolutely all the "insides" located in the carburetor body.

Such disassembly is necessary., because we get access to the internal content, which is considered the most problematic.

The most common drawback of such carburetors is the adjusting screw, which is responsible for the quality of the mixture.

Disassembly

In other words, we turn this screw, but the mixture does not change, it remains constantly unchanged.

To change this, you need to make a certain repair of the carburetor located inside the Mole walk-behind tractor. The main reason for problems with regulating the mixture is one circumstance. The fact is that inside the carburetor there is a special channel that goes to the tube located in the center of the carburetor.

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In this pipe, in theory, there should be a through hole connecting this very channel. The problem is that on some factory units this pipe is put obliquely, which leads to the fact that the channel and the hole on the pipe do not match.

There are times that on the pipe this hole is completely absent, or it is of insufficient diameter. To make repairs, we need to perform several sequential steps:

This is the whole process of the necessary changes in the design of the carburetor. Thanks to them, the adjusting screw fully fulfills its duties to change the quality, which, in fact, was required of it.

Application of the Krot walk-behind tractor widely used in many regions of our country... This is no coincidence, because through fairly simple alterations, you can get from it a rather powerful unit, comparable to more expensive models.

But even without that, even with the factory version of the engine, it is able to cope with most of the tasks assigned to it.

However, in order to achieve this, it is necessary to periodically adjust the main working units of the device.

You can find out about this frequency from the operating instructions that come with the walk-behind tractor. It contains all the detailed information on how to fine-tune the settings, as well as when it needs to be done.

Many owners of walk-behind tractors had to deal with malfunctions associated with the operation of the carburetor. How to independently understand the carburetor device and clean and adjust it, thereby not causing even more harm to the technique? We will try to tell you about this as much as possible in this article. After all, do-it-yourself repairs are not only saving your money, but also a useful experience.

In order to properly adjust or clean the carburetor on the walk-behind tractor, you should first say a few words about its structure.

As you know, the carburetor in the walk-behind tractor is a certain part of the fuel system and performs the function of spraying fuel, enriched to the required degree with oxygen. Basically, modern walk-behind tractors run on a gasoline engine (although there are alternatives - diesel and electric). Their designs are mainly of 2 types: rotary (simple in structure and designed for less powerful engines) and plunger (for motoblocks of higher power, multi-element).

Externally, the carburetor for the walk-behind tractor looks like this:

The internal structure of the carburetor of the K 45 walk-behind tractor, which runs on gasoline, schematically looks like this:

Instability in the operation of the carburetor of the walk-behind tractor most often occurs due to a low fuel level in the tank, due to poor-quality fuel, contamination of the filter on the fuel supply valve or clogging of the internal parts of the carburetor. To clean the carburetor of the walk-behind tractor in order to remove debris from the filter mesh and jet, disassembly should be carried out according to the following scheme:

carefully remove the carburetor and drain the fuel from the float chamber. If air does not pass through the fuel connection, you need to blow it through;
having examined the float chamber and the float adjusting tongue, determine the level of the incoming fuel (the optimal level is usually no more than 35 mm);
remove the low and maximum throttle needle to clean the jet. After unscrewing the bolts, separate the upper and lower parts of the carburetor, thoroughly flush the fuel cock with gasoline;
Clean the jet with a stream of air using a pump. Never wipe the carburetor parts with a rag.It is necessary to assemble the carburetor only after all the parts are dry (to do this, lay them out on a clean, dry surface, for example, on cardboard);
After reassembly, make sure the carburetor is assembled correctly, all the parts that come out are in place, and the holes are aligned with the tubes. Only then install the carburetor back on the walk-behind tractor.

In order to properly assemble the part after disassembly, we recommend that you familiarize yourself with this video:

The most common reasons for debugging work are no idling or increased engine speed in this mode. The planned carburetor adjustment should be carried out after the walk-behind tractor has not been used for a long time, or vice versa - after prolonged intensive work. It is also imperative to adjust the carburetor immediately after cleaning and installing it on the walk-behind tractor.
Image - Do-it-yourself cultivator carburetor repair

The carburetor setting of the walk-behind tractor should be carried out according to the following algorithm:

the needle of low and maximum gas is twisted to the end, then unscrewed back by 1.5 turns;
warm up the engine (at least 5 minutes);
start the engine and leave it to run at the lowest speed;
set the throttle screw to such low idle speed, at which the engine will work optimally, smoothly and without noise;
the idle speed is adjusted to the maximum with the idle needle;
set the idle speed with the throttle screw to a minimum. Repeat the previous and this point of the algorithm until the motor starts to work normally;
put the engine steer lever in the "gas" position;
adjust the maximum throttle needle until the engine normalizes if any noises or interruptions occur.

For clarity, we recommend that you familiarize yourself with the video of adjusting the carburetor of the K45-M3 model on the Belarus MTZ 12 walk-behind tractor:

The carburetor for the walk-behind tractor acts as a unit of the power system. Its task is to optimize the fuel to obtain the desired composition.

The carburetor requires constant load monitoring. For its proper operation, regular checks and proper operation are required. Much depends on the configuration of the unit and the quality of the fuel used.

The walk-behind tractor is a powerful mini power unit with additional equipment for performing various functions. It is often based on a gasoline engine, less often a diesel or electric one. A carburetor is used to ignite the fuel.

There are two main types of carburetors:

Rotary. Differs in simplicity of structure, often found in engines of small sizes (12-15 cubic inches);
Plunger. The multi-element design is relevant for high-power walk-behind tractors.

Carburetion is carried out due to the following parts: piston, fuel tank, Venuri tube, fitting (acts as a connector), high and low speed needles.

The piston moves upward, creating a vacuum. The carburetor begins to absorb air that travels through the venturi. The created vacuum allows fuel to flow from the tank to the engine through the connecting fitting. The fuel then flows around the main needle and through the inlet into the venturi.

While pressing the throttle lever, the low speed needle opens access to gasoline, after which the fuel flow is controlled only by the main needle.

The demanded agricultural machinery "Neva", "Agro", "Ugra", "Oka" is in demand due to its configuration. When it comes to the carburetor of the "Neva" K-45 walk-behind tractor, this is a reliable device, distinguished by its quality and durability. KMB-5 is an older model of the carburetor in Neva units.Before buying, it is worth clarifying this nuance in order to acquire a truly professional assistant.

Powerful motors on MTZ walk-behind tractors (Belarus-09-N) and "Neva" MB-2 are supported by reliable carburetors that can withstand heavy loads. On the "Kadvi" MB-1, "Cascade" technique and the "Pchelka" motor-cultivator, lightweight models of carburetors to optimize the functionality of the engine.

A situation may arise in which the engine is unstable. In this case, it is necessary to adjust the carburetor on the walk-behind tractor.

It is worth starting tuning in early spring (after a long downtime of the unit) or in late autumn (after heavy loads).

It is better to carry out all repair work in a free and well-lit space. To set up a carburetor with your own hands, it will take a minimum of time and effort. Procedure:

the motor warms up for five minutes;
the screws for the minimum and maximum gas are screwed in until they stop;
adjust the screws by a maximum of 1.5 turns;
set the gear lever to the minimum stroke;
using the throttle control screw, achieve minimum rpm when the motor runs "without dips";
using the idle screw, adjust the idle speed to maximum until the engine runs continuously;
the engine must be running during all manipulations. Only at the end it must be muted and turned on again for control.

If you check your actions with the instructions, you can avoid mistakes in the repair. After adjustment, the engine should run quietly and without interruption.

Owners of walk-behind tractors should familiarize themselves in detail with the specifics of the carburetor operation, as well as ways to eliminate breakdowns. The proposed video will help you deal with the problem that has arisen. Image - Do-it-yourself cultivator carburetor repair

The carburetor is the element of the walk-behind tractor that is necessary to control the flow of air and fuel.

Thus, the optimization of the motor operation is carried out at a stable load. Like any mechanism, the carburetor needs proper care.

As you know, the walk-behind tractor, like many other units of this type, works with the help of an engine. Due to the fact that the engine cannot ignite without supplying oxygen, it becomes necessary to use a carburetor. For the walk-behind tractor, two types of carburetors are used. One of them is rotary, the other is plunger. Naturally, each of these types has its own advantages and disadvantages, the choice depends on the walk-behind tractor, its performance and the type of work performed.

There are times when there are abnormalities in the operation of the carburetor (the process is unstable). In such a situation, the carburetor needs adjustment. How to adjust the carburetor on the walk-behind tractor? It is quite possible to do it yourself, following a certain sequence of actions.

First, you need to turn the screws (full and low throttle) until they stop. Then turn them one and a half turns.
Start the engine, give it time to start and warm up.
Do not stop the engine and place the engine control lever in the lowest speed mode.
Next, set the minimum number of revolutions when the device is running stably.
Then run idle to maximum.
Shift idle to minimum. Repeat this step, alternating with the previous one, until the engine runs smoothly.
Move the control lever to the throttle position.

Following such instructions, you can independently adjust the carburetor of the walk-behind tractor.

Sometimes, in order to bring the carburetor for the walk-behind tractor to a stable, working condition, there is not enough adjustment, repair or replacement is necessary.

It so happens that the carburetor choke does not close completely. To eliminate this problem, you should check the operation of the drive. If jamming is found, remove it. Moreover, given that the carburetor provides fuel and, therefore, drives the walk-behind tractor itself, you should carefully monitor the condition of this part and take proper care of it.

To avoid serious damage to the carburetor, you must constantly monitor its operation. In addition to adjusting the idle speed, you need to regularly clean the carburetor and replace worn parts. Since the carburetor interacts with the fuel mixture and air, the cause of its contamination can be either in the first or in the second source.

Filters can be used to reduce contamination significantly and should be cleaned and replaced as needed. In addition, the quality of the fuel also has a significant effect. Poor quality flammable fluid can damage parts and cause premature replacement. If there is a need, a carburetor for a walk-behind tractor can be purchased at the car market or store. Its replacement, adjustment and cleaning are also carried out by specialists.

Adjustment of the carburetor of the walk-behind tractor should be carried out periodically in order for the mechanism to work properly. A possible cause of differences in the operation of the engine of the walk-behind tractor can be the carburetor. To do this, the device is disassembled, cleaned and adjusted (tuned). Regardless of the brand of carburetor and on which device it is installed, the principle of regulation is the same for everyone. The difference can only be in the number of revolutions.

What to look for during a motor failure? If a carburetor malfunction occurs, the first step is to check the fullness of the fuel tank and the oil level. If there is enough fuel and oil, then proceed to inspect the spark plug. To do this, unscrew it and check the spark with the ignition. Next, the flow of gasoline to the carburetor is tested. For this purpose, remove the hose from the fitting and monitor the flow of fuel. If no fuel appears, it is likely that the filter mesh will need to be cleaned. For this, the fuel cock is unscrewed and all parts are rinsed with gasoline. The same is done with the carburetor jet.

Carburetor cleaning is done as follows. To clean the device, you must first remove it. To easily remove the carburetor, you need to carefully inspect the body of the device and unscrew all the parts on which it rests.

So, remove the carburetor and pour gasoline out of it. We carefully separate all parts of the device (jet, float) for further purging and cleaning. This manipulation is performed with a special cleaner.

If it is heavily soiled, you can use a compressor.

After cleaning, we thoroughly dry all the parts and feel free to start assembling. After assembly, adjust the carburetor for the walk-behind tractor.

We install the cleaned device using a standard gasket and fasten it with nuts. Don't forget about the air filter, the speed regulator and the gasoline hose.

Setting up the carburetor of the walk-behind tractor is to adjust it. In order to independently adjust the carburetor, you need to do the following steps:

The screws for idle and full throttle must be tightened as far as they will go.
Unscrew the low and full throttle screws one and a half turns (set the throttle valve in such a position that a gap of the appropriate size is formed between the base and the air duct).
Start the engine and wait until it warms up.
With the engine running, set the control lever to minimum speed.
Achieve smooth engine operation.To do this, you need to make the minimum idle speed using the throttle screw.
Set idle speed to maximum with idle screw.
Set idle speed to minimum with throttle screw.
Repeat steps 6 and 7 until the engine starts to run continuously.
Set the engine control lever to gas.
If an interruption occurs, unscrew the screw that regulates the quality of the mixture, no more than 2.5 turns.

I would like to note that the adjustment of the carburetor on the Neva walk-behind tractor is done clearly according to the above instructions. The K-45 device installed on the Neva walk-behind tractor is single-chamber and horizontal. The float chamber is located in the central part. The throttle valve is flat.

The Neva walk-behind tractor uses the DM-1K engine, which is produced at the Krasny Oktyabr Neva plant. The manufacturer categorically does not use Chinese-made engines. This also applies to the production of a motor-cultivator.

Gasoline supplied to this device must not contain mechanical impurities.
All parts are processed exclusively with gasoline. Do not use a solvent, as the elasticity of the washer and rubber parts will be damaged.

Use compressed air to dry the parts. Cleaning small holes with a wire or needle is not recommended. Installation after repair or cleaning must be carried out evenly so that there are no bends and deformation of parts.

The float chamber must be tightly connected to the body. Check the air filter connection before use. There should be no gasoline leaks.

Prepare the carburetor before starting the engine. To do this, you need to make sure that no gasoline is leaking from it. To do this, simply open the fuel cock. Close the air damper and turn the control lever until it stops. Open the throttle valve 1/8 - 1/4 of the maximum stroke.
At a low air temperature (below + 5 ° C), squeeze the drowser until fuel appears from the hole.

While starting, slightly open the choke, and after the engine warms up, open it completely.

In this case, follow these steps:

Separate the device from the engine.
Remove dust using a soft brush and gasoline.
Unscrew the float and union.
Flush the filter and all parts with clean fuel.
Purge with compressed air.
Check that all parts are dry.
Assemble the device and install it on the engine.

The carburetor does not require daily major cleaning or adjustments, but its condition must be monitored for flawless engine operation.In the event of malfunctions in the engine of the walk-behind tractor, the most common reason is the contamination of the device. This is very often related to the quality of the gasoline.The problem can be associated with both contamination of the carburetor and with the wire connecting the accelerator pedal to the carb. If, when the wire is disconnected while the engine is running, the speed readings return to normal, then the wire will need to be changed.Along with the engine, the carburetor is one of the most important elements of the walk-behind tractor, the main function of which is to enrich the fuel with air and supply the finished mixture to the engine of the unit. From time to time, the carburetor of an agricultural machine requires adjustment, which will help reduce the amount of fuel consumed and increase the power of the walk-behind tractor. Adjusting the carburetor is not difficult, but before starting work, you should prepare and study the sequence of steps when performing this procedure.The carburetor for the walk-behind tractor has a fairly simple design. Nevertheless, it should be studied, since in the future this will allow for timely adjustment and self-repair of the unit.The device of the carburetor available in the walk-behind tractor consists of the following elements:

a float connected to a needle-type shut-off valve;

float chamber;

chambers for mixing air with poured fuel;

diffuser and fuel spray mechanism;

throttle valve;

air and fuel valves with installed jets.

The float connected to the needle valve plays the role of a kind of regulator of the amount of fuel in the float chamber. As soon as the fuel level drops, the carburetor float is lowered, which causes the needle valve to open. This contributes to the ingress of the missing amount of fuel into the float chamber. After the chamber is filled with gasoline, the float rises, at the same time closing the needle valve.

Between the float chamber and the mixing chamber, there is a sprayer that distributes gasoline to the mixing chamber. There, the fuel is mixed in air, which in turn enters the carburetor through the inlet pipe. The volume of fuel inside the float chamber is always a few millimeters below the level of the outlet position. This is necessary so that when the engine of the walk-behind tractor is turned off, the fuel does not spill out of the float chamber. This is especially necessary in cases where the walk-behind tractor is located on a slope.

There are a number of signs indicating the need to adjust the built-in carburetor of the walk-behind tractor.

These include:

a sharp drop in the power of the walk-behind tractor;
an increase in the amount of generated exhaust gases;
starting the motor-block motor with subsequent spontaneous shutdown;
unstable operation of the engine of the unit at idle;
the rapid increase in the amount of fuel consumed.

There can be several reasons for all these malfunctions. Among them - the use of a walk-behind tractor with excessive loads on its mechanisms, as well as a long downtime of the unit without practical use. In any case, the timely adjustment of the carburetor of the agricultural machine used will help solve these problems.

It is quite simple to adjust the carburetor of an agricultural machine yourself. Before adjusting, you will need to start the engine and let it run for 5 minutes. After that, you need to directly adjust the carburetor on the walk-behind tractor.

The procedure is performed in the following sequence:

After preheating, you need to turn off the engine and set the walk-behind tractor in a stationary position. Next, turn the screws that regulate full and low gas to the stop, and then unscrew them 1.5 turns in the opposite direction;
Next, you need to start the engine again and warm it up - this should take at least 5 minutes;
Then you need to set the engine speed control lever to the lowest speed position - while the engine must be running;
After that, you need to turn the throttle position adjustment screw to the position at which the walk-behind tractor engine will work most stably;
Next, you need to turn the screw for adjusting the low speed of the carburetor to the most extreme maximum position;
Then you need to turn the throttle screw to the minimum position;
The last two procedures should be carried out until the engine starts to run smoothly;
After that, you need to set the engine speed control lever to the maximum throttle position;
At the end, you will need to turn the screw responsible for adjusting the maximum speed 2.5 turns in different directions to check the stability of the engine. More details about setting up the carburetor can be found in the video.

As a result of intensive use of the walk-behind tractor, over time, a large amount of dust and vaporization products of the fuel mixture accumulate in its carburetor. This has a negative effect on the efficiency of the mechanism, and in order to correct the situation, you will need to thoroughly clean the carburetor.This procedure is performed in the following order:

First you need to remove the carburetor from the walk-behind tractor;

Then it is necessary to drain all the fuel from the float chamber of the device;

Next, you need to inspect the float fitting. If the fuel flows out of it too slowly, then the union will need to be blown out with compressed air from the cylinder. Then you need to turn the fitting 180 ° - if after that the fuel stops flowing out of the carburetor, then the fuel valve is fully operational;

After that, you need to check the jets. To do this, you need to unscrew and remove the screws responsible for adjusting full and low throttle, as well as disconnect the lower and upper parts of the carburetor body. After that, you need to flush the jets and the fuel cock. For flushing, it is best to use pure gasoline, or blow them with compressed air from a cylinder;

Next, you need to expand the carburetor parts to dry them completely. The assembly of the carburetor is carried out exclusively with absolutely clean spare parts.

In this material, we will consider the adjustment of the carburetor of the walk-behind tractor, this material is an addition to the topic "Repair of the motor-block engine".

Carburetor adjustment is performed with the engine warm in the following sequence:

Screw in the full throttle and idle throttle adjustment screws all the way, then unscrew them 1.5 turns, start the engine and warm it up for 5-10 minutes. Place the engine control lever in the minimum RPM position without stopping the engine. Using the throttle valve, set the minimum idle speed at which the engine runs smoothly and without interruption.

Using the idle screw, adjust the idle speed to maximum, then with the throttle stop screw, adjust the minimum idle speed.

Then it should be repeated, the last two operations until smooth, stable operation of the engine at idle with minimum speed.

Move the engine control lever to the "gas" position, in case of interruptions in the operation of the motor-block engine, unscrew the full throttle screw until smooth operation is obtained, but no more than 2.5 turns.

Like any technique, a walk-behind tractor requires timely maintenance and repair. And it is advisable to entrust their implementation to specialists who have the necessary tools and equipment and know their job well. However, if you are also familiar with the device of internal combustion engines and understand the topic of mechanical engineering, then you can do a lot of what may be required to restore the operability of the machine yourself.

Diesel and gasoline engines have different motor resources. For the former, the normal figure is 4000 m3 / h, but the latter are capable of providing only 1500 m3 / h. Despite this, diesel models of walk-behind tractors are not in high demand. After all, both when buying and during operation, they are much more expensive. Therefore, most likely you are working with a walk-behind tractor equipped with a gasoline (carburetor) engine.

All breakdowns that may arise during the operation of agricultural mini-equipment can be conditionally divided into two categories:

Engine malfunctions:

startup problems;
malfunctions.

Malfunctions of other units and mechanisms:

improper clutch operation;
breakdowns in the gearbox;
problems with the chassis;
malfunctions of control and automation;
malfunctions of walk-behind tractor systems (cooling, lubrication, etc.).

In many ways, the success of repairing a suddenly out of order machine depends on the correctness of the diagnostics. With regard to maintenance, it is carried out precisely in order to identify small malfunctions, which subsequently lead to serious ones.

If you do not have the necessary knowledge, premises, tools and materials necessary for servicing and repairing the motor, entrust the work to a specialist!

If attempts to start the walk-behind tractor were unsuccessful, this means that there are malfunctions in the engine or starting system. In order to determine the source of the breakdown, you first need to check the spark plugs.

If the spark plugs are dry, this means that the fuel mixture is not entering the engine cylinders. There may be several reasons for this:

there is no fuel in the tank;
the fuel supply valve is closed;
the hole in the gas tank plug is clogged;
foreign objects have entered the fuel supply system.

To fix problems with the fuel supply, you must:

Fill the tank of the walk-behind tractor.
Open the fuel cock.
Clean the drain hole located in the fuel filler cap.
Remove the fuel cock, drain the fuel tank and rinse it with clean gasoline. After that, remove the connecting hose on the side of the carburetor and blow it out together with the carburetor nozzles without disassembling the latter using the fuel pump.

If fuel enters the carburetor but does not reach the cylinder, the problem is with the carburetor itself. To eliminate it, this unit must be removed, disassembled and cleaned. Well, after that - assemble and install in place. Therefore, before performing all the necessary manipulations, it does not hurt at all to refresh the memory of the device and the principle of operation of the carburetor.

In the event that, when checking the candles, they turned out to be wet, i.e. fuel is supplied normally, but the engine does not start, the problem may be as follows:

Failure of the ignition system:

there is a characteristic carbon deposit on the spark plug electrodes (it is necessary to clean the candles with emery, after which they should be rinsed with gasoline and dried);
the size of the gap between the electrodes does not correspond to that specified by the manufacturer in the engine operating manual (the gap is adjusted by bending the side electrode to the required dimensions);
insulators for spark plugs or high-voltage wiring are damaged (defective plugs and wiring must be replaced);
the STOP button is shorted to ground (for normal engine start, the short circuit must be removed);
contacts in the angles of the candles are broken (contacts should be put in order);
the gap between the magnetic shoe and the starter does not correspond to the standard value (gap adjustment is required);
defects are found on the stator of the ignition system (the stator must be replaced).

Air leaks through the seals of the carburetor, spark plugs, plug and cylinder heads, as well as the carburetor and engine cylinder connections.

If a leak is detected in the connections, it is necessary to tighten the fastening bolts, tighten the spark plugs and check the integrity of the gaskets between the plug heads and the cylinders.

Incomplete closure of the carburetor choke.

To eliminate this problem, it is necessary to ensure free movement of the damper by checking the quality of the drive. If jams are found, they must be eliminated.

Compression and carburetor malfunctions

It so happens that the launch is carried out, but its process is significantly complicated. At the same time, the engine of the walk-behind tractor is extremely unstable and cannot develop power sufficient for normal operation.

The reason for this may be loss of compression, which can be identified by:

soot on the working surfaces of the valves, as well as the seats of the cylinder blocks;
deformation of the intake valve;
wear of the piston rings.

In order to restore compression, you must:

Check the technical condition of the engine timing mechanism, clean the parts contaminated with carbon deposits, and if there are any defects, replace them.
Check the condition of the piston rings and replace defective components.

If, during engine operation, black smoke comes out of the muffler, and an excess of oil is detected on the spark plug electrodes, or they themselves are covered with carbon deposits, this means that:

an oversaturated fuel mixture is fed to the carburetor;
the sealing of the carburetor fuel valve is broken;
the oil scraper ring of the piston is worn out;
the air filter is clogged.

To fix this problem, you should:

adjust the carburetor;
replace the leaky valve;
replace worn piston rings;
clean or replace a defective air filter.

In the event that, when the engine is running, light smoke comes out of the muffler, and the spark plug electrodes are dry and covered with a white coating, this means that a lean fuel mixture enters the carburetor. This problem is eliminated by adjusting the carburetor operation.

Units and components of motors that are installed on agricultural mini-machinery are exposed to significant loads. They can also fail during the operation of the unit, which will very quickly lead to serious failures.

If suspicious noises, jerks and irregularities in the operation of the walk-behind tractor systems are detected, it is very important to immediately turn off the engine, and then let it cool down - only after that it will be possible to fix the problem.

If, during operation, the motor starts to gain momentum on its own, i.e. is "running out", most likely this means that the fastening of the regulator and traction levers is loose. In this case, the user will have to readjust the motor control drive.

Sometimes, when the throttle is fully open, the engine does not accelerate when the throttle is pressed, but on the contrary begins to lose power until it stops completely. This is a clear sign of overheating, so the walk-behind tractor must be turned off and wait until its components have completely cooled down. After that, you should check the oil level in the crankcase, and also check the cleanliness of the ribbed surfaces of the blocks and cylinder heads.

With increased engine loads, it can jam. There may be several reasons for this:

not enough oil in the crankcase;
a nadir formed on the lower head of the connecting rod;
the connecting rod or oil spray is completely out of order.

If the motor of the walk-behind tractor is jammed, it will have to be disassembled and the condition of the main units and components should be checked: faulty, deformed, melted, etc. subject to replacement.

What to do if the motor block motor works intermittently and does not develop the required power? There may be several reasons for this behavior:

Air does not enter the carburetor, which means that the fuel does not burn well - the filter will have to be cleaned or changed.

Fuel residues and combustion products form a thick deposit on the inner walls of the muffler, which must be removed.

In this case, the assembly will have to be removed, disassembled and properly cleaned all of its components. After that, the carburetor must be assembled and properly adjusted.

Wear of the cylinder-piston group.

Temperature and high loads do their job, and even the most durable metal wears out and deforms over time. Such parts should be replaced immediately, otherwise you can pay for this with irreparable damage in the engine itself.

Damaged ratchet housing or ratchet

The presence of this problem is indicated by the lack of movement of the crankshaft when the engine is started. To replace the clutch housing and ratchet, you will have to completely disassemble the starting block.

Loosen the screws securing the starter housing to the engine housing.

If the starter cord does not return to its original position, the starter motor must be adjusted. To do this, the screws are loosened and the position of the knot is set by hand so as to ensure the normal return of the cord.

A fairly common reason for the lack of a return stroke of the starter cord is the failure of the starter spring - it will have to be replaced.

The service life of any equipment is significantly increased by competent maintenance of its main units and components. The promptness of replacing worn-out spare parts is also of great importance. Therefore, in the event of the slightest malfunctions and malfunctions, they should be addressed immediately - as a result, this will prevent much more serious and expensive problems.

Video (click to play).