Trimmer Is Not Gaining Momentum Well

The trimmer does not gain momentum. What to do
Why the trimmer is not gaining momentum: external factors and technical malfunctions. Diagnostics and elimination of problems of petrol cutters: carburetor, plug, filters, engine and fuel system. Electric trimmer repair. When to contact the workshop.

Motor

The engine is the most important part of any machine. There are several reasons for ICE breakdowns:

Incorrect proportions of oil with fuel (for two-stroke);
Old fuel mixture;
Wear and destruction of the piston ring;
Traces of scratches on the cylinder and piston;
Operation of the device for wear.

All this leads to the fact that the engine either does not start, or stalls.

Candle

In case of problems with the candle, sometimes it is enough to dry or clean it with sandpaper and put it back in place, setting the gap correctly. It should be 1 mm. If the spark plug is heavily soaked, it is better to replace it with a new one. With optimal trimmer operation, the candles do not fail so often.

Diagnostics and elimination of problems of electric motors

Malfunctions of electric trimmers can be as follows:

Insulation failure or cable break;
Malfunctions in the area of the cutting tool;
Damaged outlet or plug.

To cope with these breakdowns, you do not need to disassemble the entire apparatus.

In case of serious engine malfunctions, you will have to disassemble it. To do this, you need to unscrew a few screws. Having gained access to the parts of the motor, you need to carry out the following actions:

Check the degree of wear of the brushes. Unsuitable parts will need to be replaced with new ones;
Ring the motor winding. The resistance must be high;
Check the stator and rotor. To test the rotor winding with a multimeter, measure the resistance: large deviations from the norm indicate a malfunction, the absence of resistance on the stator winding also indicates a breakdown (in a similar way, the stator case is diagnosed).

Low RPM problems are common with cheap trimmers. However, if improperly maintained, hand mowers such as Huter, Patriot 3055, Echo suffer from this.

Filters

A clogged air filter is another reason for the unreliable operation of the device. To check the involvement of this element in the malfunction, you need to start the petrol cutter without it. A dirty filter can be washed in gasoline, dried or replaced with a new one.

A clogged fuel filter does not allow fuel to enter the cylinder, and the engine stalls at full throttle due to an elementary shortage of gasoline. This element is located inside the tank on the intake hose. To eliminate the problem, replace the old filter with a new one or thoroughly rinse the one that was removed.

When to contact the workshop

If the device is under warranty, at the first signs of incorrect operation it can be safely taken to a specialized workshop. The repair will be done free of charge, regardless of the nature of the damage, if it happened through no fault of the owner. In case of engine breakdowns, a person who is ignorant of technology is better off immediately contacting a specialist. In any case, the severity of the unit malfunction is determined by the user.

Summarize. Both gasoline and electric trimmers are built to provide years of reliable performance. Most of the problems described above occur due to the owner’s insufficient attention to his assistant. Subject to strict adherence to the manufacturer’s requirements and regular maintenance, the hand mower will work rhythmically and without interruption.

Features of the trimmer

All trimmers are classified by type of power: gasoline or electricity (mains or battery). It should be noted that gasoline mowers surpass their electric and battery counterparts in many respects. While they all perform similar functions, the differences in performance, agility and efficiency are very noticeable. However, the general principle of operation of all types of hand-held mowers is almost the same. The devices are equipped with motors (two- or four-stroke internal combustion engines or electric motors) that drive the cutting unit (a spool with a fishing line or a metal disc). All elements are fixed to a straight or curved bar, including a trimmer handle, on which the main buttons are located.

Since the problem of low revs is more common with gasoline trim options, they will receive more attention. So, the brushcutter is very comfortable to work and unpretentious in maintenance. Over, most of its malfunctions are caused by the user’s ignorance of elementary things, which are written in the instructions. Therefore, before starting to operate the unit, you must carefully study the manufacturer’s manual. In particular, to start the engine, the following steps must be taken:

Turn on the ignition button;
Press the silicone button several times to pump gasoline;
Close the air damper;
Set the throttle lever to the high speed position;
First make light jerks with the starter handle to feel the resistance of the engine, then jerk sharply.

If the brushcutter starts up, but stalled, you need to put the air damper in the middle position and try again. When the engine starts working, you need to slow down the gas and open the air damper, since the trimmer functions only on suction.

What could have broken

Problems with the petrol brush, due to the fact that this device does not start, are classified in a certain way by service specialists. They highlight faults with the following components of the mechanism:

An engine in which the piston and bearings may wear out or fail, crack the crankcase;
The fuel supply system, while the filter may be clogged or problems with the carburetor;
Mechanical damage to wires, tubes, hoses;
Ignition circuit.

At high revs

When the scythe stalls at high speeds, this is due to the following problems:

Clogging or sticking of the valve located on the gas tank cap;
The carburetor is out of alignment under the influence of vibrations arising during the operation of the mechanism;
Problems with the circulation of the fuel mixture;
Suction of atmospheric air;
The fuel intake hose is cracked or loose.

Adjust the carburetor according to the trimmer operating instructions. For adjustment, it is often sufficient to loosen the tightening of its housing. If there are problematic points with the circulation of the fuel mixture, then it can gradually enter the carburetor. After its development, the engine stalls at high speeds.

Immediately after wound up

The unit may stall immediately after starting if the carburetor is misaligned or incorrectly adjusted. This causes an uneven fuel supply. The result of this is that the device vibrates distinctly. For troubleshooting, the carburetor is reconfigured, following the instructions for the mechanism.

Also, the engine stops when the fuel supply valve becomes clogged. In such cases, it is sufficient to simply clean it. If the brushcutter first worked, but then immediately stalled, then perhaps the fuel enters the carburetor unit with some difficulty. Weakening the valve helps to resolve the issue, which ensures free circulation of the mixture in the system.

The stoppage can also be caused by air leakage in the presence of mechanical damage to the hose (holes, cracks) that takes the fuel. In this case, add more revolutions to the drive in order to quickly expel air bubbles from the system.

When heated

The brushcutter often stops when it heats up. At the same time, it starts up, works “jerky” and gradually stops. This process occurs when the gasoline in the carburetor boils or the damper is installed in a rotary rather than disc type. In the latter case, the part is changed.

It happens that the trimmer heats up if the ignition circuit wire or coil is damaged. In order for the device to start working normally, parts are replaced.

Why does the petrol trimmer stall

A scythe with a gasoline drive is a useful thing for owners of home gardens, lawns, and when the trimmer suddenly stalls, the work on clearing the area from grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its breakdown. The most common problems are contained in the operating instructions. You should know the reasons why the trimmer stalls in order to effectively repair the device yourself.

When you press the gas

If, when you press the gas, the petrol cutter stops, then the reasons may be as follows.

The most common scenario is carburetor adjustment failure, which occurs when the drive is under significant stress, after prolonged inactivity of the mechanism, or when it is used in difficult conditions.
Clogging of the fuel valve, which is eliminated by loosening it, as a result of which gasoline begins to flow normally through the system.
Loosening and drooping of the cable in the carburetor. The fuel hose can also be stretched to the point of rupture due to significant stress.
Clogged breather (non-return valve), as a result of which fuel does not flow into the tank.

If the problem is related to the carburetor unit, then it can be recognized by the appearance of vibrations of the brushcutter. When the hose bursts or the cable stretches, these components are replaced.

Immediately after wound up

What could have broken

An engine in which the piston and bearings may wear out or fail, crack the crankcase;
The fuel supply system, while the filter may be clogged or problems with the carburetor;
Mechanical damage to wires, tubes, hoses;
Ignition circuit.

At high revs

When the scythe stalls at high speeds, this is due to the following problems:

Clogging or sticking of the valve located on the gas tank cap;
The carburetor is out of alignment under the influence of vibrations arising during the operation of the mechanism;
Problems with the circulation of the fuel mixture;
Suction of atmospheric air;
The fuel intake hose is cracked or loose.

When heated

It happens that the trimmer heats up if the ignition circuit wire or coil is damaged. In order for the device to start working normally, parts are replaced.

When you press the gas

If, when you press the gas, the petrol cutter stops, then the reasons may be as follows.

The most common scenario is carburetor adjustment failure, which occurs when the drive is under significant stress, after prolonged inactivity of the mechanism, or when it is used in difficult conditions.
Clogging of the fuel valve, which is eliminated by loosening it, as a result of which gasoline begins to flow normally through the system.
Loosening and drooping of the cable in the carburetor. The fuel hose can also be stretched to the point of rupture due to significant stress.
Clogged breather (non-return valve), as a result of which fuel does not flow into the tank.

Why does the petrol trimmer stall

A scythe with a gasoline drive is a useful thing for owners of home gardens, lawns, and when the trimmer suddenly stalls, the work on clearing the area from grass stops. The device itself is a rather complex mechanism, so there are many different reasons for its breakdown. The most common problems are contained in the operating instructions. You should know the reasons why the trimmer stalls in order to effectively repair the device yourself.

Carburetor adjustment

Flush the air filter before adjusting the carburetor. It is recommended to rinse it after every 10 hours of operation. After that, you can start adjusting. The graph shows an example of a PRORAB-8406 petrol trimmer carburetor. The numbers indicate the adjusting screws that we will use.

PRORAB-8406 petrol trimmer carburetor adjusting screws

Purpose of adjusting screws:

Fuel mixture adjustment screw.
Idling adjustment screw.
Maximum speed limiting screw.

Start a petrol cutter and wait until it warms up.

Fuel ratio

I read somewhere that if different proportions of preparation of the fuel mixture are indicated in the manual for the petrol cutter and on the oil canister, the proportion indicated in the manual should be used.

For a long time he did this. Excess oil flowed from the engine onto the gas tank and carbon deposits constantly formed on the candle, since the manual indicated the proportion for the run-in engine 1:25, and on the canister. 1:50. After switching to a 1:50 ratio, the appearance of oil drips stopped. The plug continued to burn, but with less intensity (the carburetor was not yet adjusted).

Until now, some users of gas-powered tools determine the proportion of the fuel mixture “by eye”. If during the preparation of the mixture the amount of oil is underestimated, after a while an extraneous sound may appear immediately after starting the engine, gradually disappearing during warming up, and the engine stops with a sharp jerk. Continued use of the trimmer in this mode will lead to its failure.

Fuel supply adjustment

Begin to slowly tighten the fuel mixture adjustment screw until the engine starts to stall or stalls if you do not have time to catch the moment. After that, unscrew the screw a quarter of a turn if the engine has not stalled, or half a turn if it stalled. Start the stalled engine. Check by opening the throttle as the engine picks up speed. Continue to unscrew screw # 1 by a quarter of a turn until the engine starts to accelerate steadily during gas blowing. This will be the moment of the most economical stable engine operation. For the PRORAB-8406 petrol trimmer, the adjusting screws are turned clockwise, unscrewed. Against, for some other brands the petrol cutter can be the other way around.

Maximum speed limitation

After adjusting the fuel mixture and low speed, check how the petrol cutter engine will operate at maximum speed. If necessary, limit the maximum RPM to the required level with the # 3 hollow screw. Loosen the retaining nut and turn in the screw to decrease the maximum speed or turn it out to increase it. Tighten the nut after adjustment. The maximum RPM setting is necessary to protect the trimmer motor from overheating and to be able to use the start key lock to reduce right hand fatigue.

In the future, it may be necessary to adjust the trimmer carburetor. For example, if the engine starts to rev poorly when running at full load, loosen screw # 1 another quarter turn. If starting is difficult, increase idle speed. Both weather conditions and the quality of the fuel mixture can affect the operation of petrol mowers. Vibration can cause the adjusting screws themselves to turn.

Idle speed adjustment

We start adjusting low speed. Screw number 2 limits the return movement of the throttle lever. By turning it, we increase the idle speed, unscrewing it, we decrease it. Adjust so that the engine runs confidently at low revs and even a little accelerated (for better starting), but so that the line reel or knife does not rotate, and there is a sufficient reserve of revolutions before they start rotating. If the engine starts poorly, increase the idle speed even more.

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