How to assemble the throttle handle on a trimmer

Minimehanik

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Grass trimmer Zipper, ESO, Shtenli, gas handle repair.

Last time we replaced the cylinder and piston in an Austrian Zipper chain saw. During the repair, we found that this gasoline trimmer is the absolute analogue of many, mostly Chinese-made trimmers, such as: ECO, Defort, Eland, Skiper, Groser, Gunter, KW, Shtenli, Belarus, Ural, Patriot, etc. Therefore, everything mentioned below, equally applies to the handles of these brands of chain saws.

According to the customer handle does not work well, he took it apart, the springs popped out as they were, he did not notice, assembled as it turned out. After reassembly, the trigger of the handle began to jam, it did not return to the original position when fully pressed, also the trigger was not blocked by the button in the pressed position, the trigger safety button stopped working.

Both springs were installed incorrectly. The person, who assembled the handle, planned that the main trigger spring will cooperate with the second part of the handle body.

The second part of the spring was supposed to hook on the plastic side of the handle body, marked with red arrow.

Either the spring was not hooked up to the board in the intended position or was out of engagement due to vibration and as a result the trigger failed and stopped returning to its original position.

The second spring, the spring of the trigger lock button in the pressed position, was also installed incorrectly and did not perform its function. So we disassemble the handle completely.

Repair of lawnmower throttle handle with my own hands

Details: lawnmower gas handle repair with your own hands from a real craftsman for the website olenord.com.

An indispensable tool of the modern gardener or owner of a private house is a lawn mower, which allows you to effectively and efficiently bring the adjacent territory in order. The brushcutter is in active use in late spring until October. Modern units are equipped with powerful and enduring internal combustion engines, reinforced transmission and basic units. Despite this, physical wear and tear, manufacturing defects or improper use leads to grass trimmer failure. In order to make repairs trimmer for grass with his hands need to have at least basic knowledge of technology and a little experience in its repair.

The main component of any gasoline-powered tool is the internal combustion engine (ICE), which transmits the torque to the actuator by various means. The modern grass trimmers use duralumin rod (pipe) as a transmission element between the motor and the trimmer head, inside which the drive shaft is located.

Thanks to the high-speed motor, the line speed can be up to 13,000 revolutions per minute, depending on the manufacturer of the grasshopper. To prevent mechanical and thermal damage to the gearbox, the housing has a hole for grease in the form of an ointment. All brushcutter models have a sturdy shoulder strap for light work over long periods of use.

Regardless of manufacturer, nearly all models are delivered with a line and steel blades.

Cross-section of PVC line for grass trimmer can vary from 1.5 to 3.0 mm.

Made of tough polymer, it is subject to intensive wear and tear during mowing and therefore breaks. You should therefore check the line from time to time in the brushcutter head and change it as necessary. It is recommended that you buy an extra bobbin to quickly replace it with a spool of fishing line when it runs out.

Presented on the market today grass trimmers with an engine are equipped with a D-shaped, U-shaped or T-shaped handle, where the main controls of the unit are placed. For example, the throttle key and the “stop/start” toggle switch are located on the right handle of a scythe with a U-shaped handle. D-handle has throttle control button directly on the shaft.

In view of the presence of many components and parts, trimmer repair for grass with their own hands involves the elimination of failures that prevent its normal operation. It is worth noting the most basic faults of gasoline-powered scythes:

  • Grass trimmer motor does not pick up speed;
  • Failure of the cylinder-piston group (CPG);
  • Faults in the ignition;
  • There is no connection between the engine and the trimmer head;
  • Mechanical knocking during machine operation.
  • Repair of the gasoline lawnmower’s central engine

The main component of any internal combustion engine is a cylinder-piston group (CPG), which can fail due to component wear and tear or low-quality fuel mixture.

Lubrication of rubbing nodes in the chain saw is carried out by adding a certain proportion of oil to gasoline. This process can be disrupted by old oil precipitating out. In this situation, when starting the grass trimmer, the motor overheats severely and the most costly breakdown occurs in a matter of minutes. To fix the problem you will need a complete replacement of the cylinder, namely the piston, oil seals, cylinder and piston rings. If you are not a master of ICE repair and do not have experience working with technicians, it is unlikely to fix the engine without the help of a specialist. Detailed steps for grass trimmer piston repair can be found here.

If the lawnmower ignition fails, the spark on the spark plug disappears and, as a consequence, the fuel mixture does not ignite.

In this situation it is important not to rush to replace the coil, because the cause of the failure may lie in the lack of contact in the switch on the control knob.

An important point in the search for faults ignition trimmer for grass will be the diagnosis of the mesh, where the distance between the side and the central electrode should be 0,5-0,7 mm. In addition, it is necessary to pay attention to the o-ring of steel on the plug, the loss of integrity or deformation of which can lead to etching of air from the combustion chamber and, consequently, a decrease in the power of the grass trimmer.

If the replacement check of the electrical circuit, plug and its contacts did not give positive results, then it is worth paying attention to the ignition module of the trimmer for grass, namely the gap with the flywheel. Regardless of the design and manufacturer of the lawnmower, the distance between the ignition coil and the flywheel must be no more and no less than 0.2 mm. To restore the optimal value of the gap you need to loosen the bolts fixing the coil and with a special measuring gauge set the ignition trimmer for grass.

A clear sign of engine power system failure is the absence of traces of fuel mixture on the electrodes of the plug, which may be due to the following defects:

Components of the grass trimmer fuel system

  • due to a clogged hole in the gas tank creates a vacuum, which prevents the normal flow of gasoline into the carburetor;
  • the fuel filter in the tank is clogged because of low fuel quality and foreign particles;
  • lack of mixture in the combustion chamber due to clogged carburetor.

You can quickly determine the cause of the malfunction by removing the fuel hose leading to the carburetor. If fuel mixture comes out in a thin stream, you should pay attention to the carburetor. If there is no flow, clean the breather plug (small hole in the gas tank lid) with a fine needle or replace the fuel filter.

If fuel flows into the carburetor, you need to clean or adjust it. Adjustment of the grass trimmer carburetor involves restoring the optimal mixing of the fuel mixture.

Grass trimmer carburetor with adjustment screws

To do this, pay attention to the three adjusting screws: maximum rpm (H), minimum (L) and idle (LA). To begin the adjustment, it is necessary to fully tighten the H and L screws and release 1 turn each. After starting the mower and give it 10 minutes to warm up to adjust the power system in operating mode. After the engine is warmed up, press the throttle trigger all the way down (12,000 rpm). Reset the idle speed by unscrewing the screw LA. As soon as the grass trimmer head starts to turn, you need to tighten the screw until it stops.

The chainsaw engine won’t start

If the mechanism does not start, immediately throttle, consistently check:

  • if there is fuel in the tank;
  • the serviceability of the spark plug;
  • Cleanliness of the air and fuel filter;
  • if the breather plug and the exhaust port are clean.

It is necessary to refuel with freshly prepared mixture on the basis of AI-92, oil is injected for exact dosage with a medical syringe. It helps to avoid expensive gasoline repair.

It is necessary to make sure that the spark plug is working, gives a spark in contact with the body. In that case you need to dry the spark plug duct, clean and dry the part itself. You can change the spark plug, but the channel still needs to be dried for 40 minutes. Check the serviceability of the high-voltage wire, there may not always be contact. Trouble in the ignition unit when repairing the lawnmower, you can’t fix it with your own hands.

If with the air filter removed and the engine does not stall, the cause is in it. it needs to be replaced or cleaned. Replace the fuel filter with great care. After checking the cleanliness of the breather, remove the muffler mesh and clean the exhaust duct.

The next step will be the repair of the carburetor, where you will have to find the fault and eliminate it, taking into account the tiny size of the parts. If the simplest operations do not yield results, in order not to disturb the fine-tuning of the system, it is better to entrust the repair to a specialist. Where to start diagnosing and how to properly repair your lawn mower with your own hands, read on

Typical malfunctions of gasoline group trimmers

The design of gasoline trimmers is more complicated than the electric ones, so they have more failures.

Ignition

If there is no spark when starting the engine, or the spark is there, but weak and insufficient to ignite the fuel, it indicates a malfunction in the ignition system. To fix it, you need to check the magneto. Sometimes you need to replace the high-voltage wire if it is broken, or clean the contacts. Also the reason that the spark is lost, can be a damaged spark plug cap. In some cases, the problem occurs if the mixture floods the spark plug, or if there is soot on the spark plug. On cheap Chinese chain saws, the motor sometimes does not start, because the circuit breaker is broken.

Often the problem is not in the parts themselves, but in the non-positioned gap between the ignition coil and flywheel magnets. In this case it is necessary to carry out an adjustment. If this procedure is not followed, there is an early or late ignition of the fuel.

Important! If the adjustment recommendations are not followed, the engine runs on low power or does not run at all, the starter motor breaks, the cord breaks, etc.д.

Fuel system

When diagnosing the fuel system, first check the presence of the fuel mixture in the tank, as well as its quality. It is prepared according to the user manual, it is forbidden to change the proportions. Also do not make the mixture to spare. it changes its properties during storage and causes damage to the machine afterwards.

The mixture in the tank must first be changed and the engine restarted. One of the signs of poor quality of fuel and lubricants. grass trimmer does not shift speed and can not pick up speed, as well as stalls, no matter how it was started. when cold or after warming up.

If the device does not start well again, you need to inspect the spark plug conduit. It is possible that a combustible mixture got into it. This is due to improper use of the tool: when starting the air damper is set in the off position, but after starting the motor does not translate into the on position, which causes the engine to stall. The next time you try to start the engine, the spark plug is covered with fuel, after which it becomes impossible to start the device. To fix the problem, the part is unscrewed and thoroughly dried, as only a dry candle can be installed. It is also necessary to drain the fuel from the spark plug channel, remove the soot from the electrodes of the plug and correctly set the gap between them when installing.

Air filter is another possible cause of grass trimmer failure. If it is clogged with debris, no air passes into the combustion chamber and the fuel does not ignite. The part is replaced or thoroughly washed and dried. If there is oil in the air filter, it must be flushed with gasoline and dried for several hours.

The fuel filter also has to be checked. It cleans debris from the fuel mixture. If it becomes clogged, the gasoline fails to flow into the cylinder and the weed trimmer shuts down. It is necessary to remove and clean the fuel filter, change it for a new one if necessary.

The breather valve is a check valve that helps equalize pressure in the gas tank. If it is clogged, it creates a vacuum in the fuel tank and no fuel flows into the carburetor. Check that by removing the hose from the tank to the carburetor. If gasoline does not come out. the valve is clogged. The breather plug is located on the gas tank lid, sometimes on the fuel tank. It must be disassembled and thoroughly cleaned.

Carburetor

This component of the lawnmower breaks down because of low-quality fuel, accumulated dirt in the chamber, as well as a deformed air filter. Parts like diaphragms, intake needle, seat, strainer, adjustment lever, baffles, etc. may be clogged or broken.д. It is necessary to diagnose the device and subsequent cleaning or repair. In some cases, adjustment of the carburetor is required.

Exhaust system

If the lawn mower stops when the user presses the gas and increases engine speed, this may indicate a clogged exhaust system. This is due to the large amount of carbon monoxide produced by the combustion of the oil that is part of the fuel mixture. To fix the problem you need to clean the muffler and related parts.

Important! The only way to avoid recurrence of the failure is to observe the correct proportions of oil and gasoline when preparing the fuel mixture.

Starter

The purpose of the starter is to help start the lawn mower engine. The main malfunctions of this unit are: breakage of the cord and breakage or failure to catch the spring. To correct the failure, the starter is disassembled, the cord is replaced with a new one, and the spring is put back in place or, if it is damaged, another one is installed.

Piston group

When diagnosing a piston group, first check the compression. If it is not fastened properly, the engine will not start. It should normally be over 8kg/cm2.

Just a side note! On some engines there is no idle, so at a reading of 8kg/cm2 they stall because the fuel mixture is not pumped. So, if the lawnmower does not pump above the recommended value, you need to check the piston, cylinder and rings.

Another possible cause of low compression is a loose carburetor. If gasoline drips when running, this also tells you that you need to tighten the fasteners of this assembly.

Cutting blade

One possible cutting blade failure is a shifted or stuck cassette cover. This is due to misalignment of the axle or installation of an unsuitable mowing head. This makes it difficult to rotate, increases the load on the engine, and it overheats.

assemble, throttle, handle, trimmer

If the cutter bar does not rotate, check the assembly depending on the construction of the boom. For the curved shape you need to inspect the bushing and the rod itself, and for the straight shape you need the shaft, the gearbox and the clutch. All connections between the parts must be intact. Check only if the grass trimmer’s engine is in good working order. Sometimes there is confusion, and users think that the problem is with the cutting unit, but actually the motor is faulty.

All gasoline-powered trimmers use a combustion engine as the power drive. By means of a rigid or flexible shaft, the rotation from it is transmitted to the cutting element. a spool with cord (fishing line) or a special knife. The shaft is placed inside a metal rod with the engine and fuel tank attached to one end and the cutter head on the other end. There is a handle in the middle of the shaft. Most often it is on it that the keys, buttons and switches are placed, with the help of which the grass trimmer is controlled.

assemble, throttle, handle, trimmer

Controls vary from tool to tool, but generally include the engine stop button, throttle trigger for carburetor throttle control, and throttle trigger stopper that makes it easier to operate the throttle trigger when you are working hard.

Gearbox. 2. Trimmer head. 3. Protective cover. 4. Gas lever stop button. 5. Switch.

throttle lever. 7. Handle. 8. Gas lever stopper. 9. Boom. 10. Belt loop for attaching carbine.

Air filter. 12. spark plug. 13. Motor housing. 14. Outlet manifold. 15. Gas tank. 16. Starter.

assemble, throttle, handle, trimmer

Grass trimmer gasoline design. Lawnmower design and common faults

It is easiest to give the lawnmower in the repair, allocating a certain amount of money from the family budget, prompt and high-quality repair with their own hands is no less simple and convenient if you want to understand the design of the lawnmower and fix all the malfunctions.

Mass and piece production of trimmers is based on the use of common technology, the typical design scheme consists of certain elements and parts, it is important to know them when carrying out independent repair work:

  • top part. The base of the entire structure, where all the important elements are assembled, such as the starter, carburetor and lawn trimmer engine;
  • middle section. Hollow rod, inside it there is a cable that connects the motor and the gearbox, which drives the cutting line for the trimmer. In this part there are mounts for weight distribution of the whole construction and a belt for fixing the grass trimmer on the belt of the person using the grass trimmer for its intended purpose;
  • lower part. The gearbox and cutting elements are located in the lower part, hidden under the practical cover to protect the user. The shroud provides an increased level of safety by preventing large debris, pebbles, and glass from getting into the person while operating the chainsaw.

Knowing precisely the internal structure and working principle of the grass trimmer, you can independently carry out repair measures for the structure or replace individual, failed components, using the repair manual.

The most common and frequently occurring, self-correctable breakdowns of the unit can be called the following problems:

  • engine malfunctions that prevent the lawnmower from starting and working
  • Increased vibration of the brushcutter boom, which makes it difficult to use it for its intended purpose;
  • increased overheating of the gearbox, its accelerated heating during operation;
  • slow and weak functioning of the cutting line at insufficient revolutions;
  • clogging of the starter grid, causing overheating of the engine and its failure to work;
  • rapid and frequent clogging of the carburetor due to the use of low-quality fuel;
  • Air filter clogging if care is not taken.

All of these problems can lead to the fact that the device will lose its ability to work, before ordering the necessary spare parts for beznokosa should conduct a visual inspection and diagnosis of the device.

Particular attention requires individual parts and units of the device, to check them you do not have to go to a professional technician, a set of diagnostic measures will help your own hands to identify the consequence of the loss of performance.