In detail: do-it-yourself g200hk engine repair from a real master for the site my.housecope.com.
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In this material, we will consider typical malfunctions of a walk-behind tractor engine and how to fix them.
Typically, there are two types of engine faults:
1. The engine will not start.
2. The engine does not work satisfactorily (it does not gain power, it runs intermittently, the engine stops).
If the engine does not start, then in search of malfunctions and their further elimination, you should perform the following steps to identify the causes.
- Checking the presence of fuel in the tank (checking the fuel system)
- Checking the carburetor air damper (when starting a cold engine, the damper must be closed)
- Checking the flow of fuel to the carburetor.
- If there is no fuel entering the cylinder, a dry plug is indicated. Check for the presence of fuel in the fuel tank, fuel flow to the carburetor by removing the fuel hose from the inlet fitting. For the K45 carburetor, press the sinker until the fuel leaks through the drain hole.
- If fuel does not flow to the carburetor, unscrew the fuel cock, disassemble it and clean the filter from dirt.
- When fuel enters the carburetor, but there is no fuel supply to the cylinder, check the operation of the fuel valve and the cleanliness of the jets.
- To check the KMB-5 carburetor, remove it from the engine, drain the gasoline from the float chamber, then supply air through the fuel inlet in the operating position of the carburetor. The air should be easily blown through.
- Repeat the purge with the carburetor turned 180 degrees, in this position the air supply should stop. If the result is the same as described, the fuel valve is working properly.
- The fuel level in the float chamber is regulated by the float tongue, the normal fuel level should be 30-35mm.
- After all actions with the carburetor and installing it back, the carburetor should be adjusted.
- It so happens that the engine does not start from excess fuel, this is evidenced by a wet plug. Dry the cylinder and “bleed” the engine with the plug removed, before that, turn off the fuel supply.
- If the plug is dirty with deposits, clean it and check the gap between the electrodes, usually the correct gap is 0.8mm. Next, you should check for the presence of a spark, if there is no spark, then there may be a malfunction in the electrical circuit or a large gap between the ignition coil and the magnetic circuit.
If the engine starts, but does not develop the required power, runs intermittently, stalls, etc., the reasons for this may be the following malfunctions:
- The air filter is dirty, as a result of which the air in the carburetor is insufficiently supplied.
- Defective ignition system. You should check it, as well as check the candle, the gaps between the electrodes, etc.
- Clogged muffler with combustion products. The muffler should be disassembled for cleaning.
- Dirty carburetor and incorrect setting.
- Low power may be due to wear of the cylinder-piston group. The compression should be 8 atm. Compression can be checked by attaching a compression gauge to the spark plug hole, turning the engine shaft with a starter.
Read also, information on how to make a trailer for a walk-behind tractor with your own hands.
If the engine of the walk-behind tractor does not turn off, first of all it is necessary to pay attention to the operation of the shutdown button. It is necessary to disassemble, check and, if necessary, replace or clean the contacts.
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 machine's performance on your own.
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 operation 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, spark plug heads and cylinders, 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 candles and check the integrity of the gaskets between the heads of the candles 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;
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 operation of the carburetor.
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 eliminated immediately - as a result, this will prevent much more serious and expensive problems.
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