How to assemble a gas lawnmower

Izhmash BK-3500 pro lawnmower assembly instructions

Gas trimmer starter repair for grass can be needed at the most inopportune moment. In this case there are two solutions to the problem: replace the broken part or replace the entire assembly. The last option will cost more. To repair the device with your own hands, in most cases you will only need a screwdriver with the appropriate tip. Repair work does not take much time and does not require special knowledge. To achieve the desired positive result, it is enough to know the structure, the principle of operation, the nuances of assembly and disassembly of the starter on the trimmer.

The gasoline engine is basically the main part of the brush. Its power is in the range of 0.5-2.5 liters.С. The movement from it is transmitted to the shaft, located inside the hollow rod, and then through the gearbox, consisting of gears, already a fishing line or knife (the working body).

Trimmers also have the following elements:

• Profiled wire;
• Lever;
• Belt, designed for easy use of the device;
• The starter used to start a gasoline internal combustion engine.

All parts of the brush are shown in the photo below.

The starter on the trimmer is an integral part that starts the engine. This is shown separately in the two photos below.

Starting mechanisms of different models of gasoline braids work on the same principle: when starting an internal combustion engine, the protrusions, marked with the number 1 in the photo above, enter into the hitch with the dogs 3. When the engine is started, they return to their previous position due to centrifugal force. Wires play a similar role 2.

The process of returning the elements of the mechanism to its original position is due to the presence of a spring coiled around the axis. It unfolds when the rope is pulled. After the cord is released, it is tensioned and collected by the spring. When the internal combustion engine starts, the trigger rotates its shaft until it starts (does not start).

Two types of starter gears are now available for gasoline-powered scooters:

The first variant is much more common.

The starter on the trimmer can work for a long time without failure. It is not possible to specify an unambiguous period of uninterrupted time. Everything is determined by the original quality of the device and compliance with the rules for handling it.

The main malfunctions of the grass starter trimmer

It is not difficult to determine the cause of the switch failure. There are several basic options:

It may happen that the starter mechanism is accidentally broken. The consequences will be deplorable if you wind a wound cable on the flywheel of an active internal combustion engine: then the spring will burst, the pulley will break. But such cases, when a complete replacement of the starter is required, are very rare. In most cases, it is enough to put a new spring or replace the cord to fix the mechanism.

How to make a mower from a chainsaw with your own hands?

The easiest way to make it is a home-made mower on the basis of a chainsaw. The design of the chain garden tool already has almost everything necessary for work. The manufacturer only needs to complete the device with the missing nodes.

Before you start assembling a lawn mower from a chainsaw, you will need to study the drawings. During their preparation, it is necessary to specify the dimensions of all parts used and the order of their installation directly on the mower.

After studying the diagrams, you need to prepare the materials that will be needed during the work:

• metal corner. needed to assemble a rigid supporting frame;
• steel plate. required for installing and securing the motor;
• 2 pairs of wheels from a garden cart or baby carriage;
• fixing rail or a pair of rotary discs;
• A 5 cm piece of pipe;
• Gear and bearing to connect to the pipe;
• blades of steel blade, which can be removed from a household wood hacksaw;
• bolts, nuts, brackets, and other fasteners.

From the tools the constructor will need a welder, a drill with a set of drills on metal, as well as an angle grinder with a set of discs of different diameters.

Mower from a chainsaw Friendship with their own hands

To obtain high-quality and durable grass mowing equipment, it is necessary to strictly adhere to the correct algorithm of action. A standard self-propelled lawn mower is assembled in the following order:

• First, the tube must be inserted into the groove of the bearing used, and the gear must be stationary inside;
• To the end that remains free, it is necessary to weld 2-centimeter “ears”. After that, holes must be drilled in the “ears”;
• To make the blades, you will need to cut the blade from a hacksaw. It must be cut into several equal pieces;
• To fasten the blades to the rotary disc or to the prepared bar, rivets must be used. The diameter of the finished construction should be about 40 cm;
• After that, you will need to weld a rigid frame, using a metal angle for this. The frame must be reinforced with steel struts that will prevent it from breaking when the mower hits a tree or a bench. The dimensions of the support frame must match the dimensions of the chainsaw;
• Inside the frame you need to install a stand of rectangular shape. on it will rest the body of the mower. To make the equipment as balanced as possible, all its connections should be placed strictly at right angles and be sufficiently rigid;
• To the finished frame it is necessary to weld mounts, which will help to fix the wheels, handles and separate metal hooks, required to support the entire device;
• After that, it is necessary to install the wheels;
• Next, it will be necessary to secure the chainsaw, having previously removed the saw headset from it. The tool must be fixed firmly to the frame;
• A steel plate will then need to be cut along the contour of the finished body. It must be mounted over the chainsaw. The result will be a reliable metal cover, which will protect the saw from moisture and grass;
• In the next step, a pipe with the cutting blades of the homemade mower should be screwed to the drive sprocket of the chainsaw maker;
• At the end will be left to install the handles, on which you need to bring the levers and the control buttons of the lawnmower.

Not only a rotary lawnmower is made according to this scheme, but also a segment mower or a chain mower. The only difference between the two is in the cutter bar design and operating principle.

Layout of a petrol brushcutter

In general, the device of the mower can be considered primitive. The technique does not differ from other types of garden equipment. The brushcutter is based on a single-cylinder carburettor engine.

The starter is manual, the engine is air-cooled.

Most often, brushcutters have two-stroke engines, but modern, expensive models have four-stroke power devices. The difference between the two-stroke engine and the single-cylinder engine is inherently simpler, but the engine is noisier and produces more fuel. gasoline. in the combustion chamber.

Four-stroke engine gives more rpm. When working with a brushcutter, you instantly feel the power and efficiency of the machine. Vibrations are very low and emissions are low. Such an engine is considered to be reliable, its motor life is much higher than the two-stroke engine.

Two-stroke engines run for a limited time. The manual specifies how long you can work with the brushcutter as long as it needs time to cool down the engine. A trimmer line or metal blade is used as the cutting material.

For your brushcutter to work efficiently and for a long time and to avoid needing frequent repairs, it is important to follow the correct operating procedures. It is not permitted to break the prescribed rules. Regular maintenance is important.

Even if you have never held a brushcutter in your life, you still have no problem using it. The main job is to rotate the brushcutter from side to side while cutting the grass.

There are several types of grass mowing. You can, for example, turn the machine from left to right as you push forward. There is the so-called square system, when a person with a brushcutter walks on the square. You can use any method, but the main thing is not to violate the rules, mentioned in the instruction manual.

When mowing, the trimmer line should not be pressed against the area that has already been mowed. If this rule is neglected, the motor will be overloaded and the head will fail. In order to mow tall grass, you must use a line for the trimmer. The stringline should be parallel to the ground.

Of course, it is necessary to be concerned about the safety of equipment. However, you should worry about your safety more than anything else. Before operating a brushcutter you should wear safety glasses, ear protectors and a special suit that covers the exposed parts of the body. Always wear tight-fitting shoes.

If you see stones and other debris in the area, remove them. There must not be people within a radius of fifteen meters near the work being done.

Without petrol the lawnmower will not run, so it is advisable to use the correct proportions of petrol that are specified by the mower manufacturer. The correct mixture is oil and gasoline for two-stroke engines. Motor oil is not used in the brushcutter, because there is no guarantee of engine quality. Only the highest quality gasoline is used for petrol brushcutters. High-octane gasoline also needs proper storage. This fuel should not be stored in a metal container for more than one month. Otherwise the quality of the fuel is lost, the oxidation of the container begins.

Rules of working with a new chain saw

Before you can use a gasoline-powered motor on a load, you must run the engine. This is how you can increase the performance of your engine. The reason is that the engine components rub against each other during the running-in period. During the running-in period it is easy to learn how to work with the device. The first time you use your petrol brushcutter you should follow these rules:

• You can not let the engine run at maximum power for a long time;
• Always check the engine temperature;
• You can not use a brushcutter in action until the engine will not be warmed up;
• After the running-in period, change the oil;
• Never overload the motor;
• You have to clean the fuel filter and the engine grill;
• every ten hours of operation of the engine you need to clean the air filter;
• the lubrication of the tip on the tube must be done every twenty hours;
• Never work with a blunted blade.

You can therefore use your brushcutter in a gentle running-in condition. This will extend the life of your lawnmower.

Electric lawn mower with their own hands

In order to make an electric lawnmower yourself, you can use a motor from some unnecessary device. Household appliances are equipped with motors that may burn out quickly. Even vacuum cleaners are equipped with weak motors. For the most comfortable operation of the homemade lawnmower, it is desirable to take a motor with a capacity of not less than one kilowatt.

The blade can be cut from a durable steel alloy. You can also use a round disc, sharpening it beforehand.

The handle of the device can be taken from an old baby carriage or cart. The use of a cart or carriage as a frame greatly simplifies the production of equipment, but all components of the construction must be strong enough. It is also possible to make the handle from pipes, using a welding.

The cord, which will supply the power, should be lengthened. The castors in this case must not be too massive.

First you need to make a frame out of metal. The motor is mounted on it with screws. At the bottom of the frame is fixed the cutting mechanism, which is connected to the motor. A grass sack can be placed behind it.

It is necessary to put a cover around the blades for protection. The motor and the connection to the blades must be securely closed so that the grass does not get into them.

Mechanical mower

Mechanical type equipment makes much less noise, and it also does not require power consumption. You can even work in the rain with this mower, but it is more difficult to make. The whole problem is that it’s very difficult to pick up the gears, wheels and blades.

A mower equipped with a pair of blades needs a quick rotation of the blades. It has to be created by the movement of the wheels and gears. Creation of such equipment requires maximum attention and patience from the performer.

Running gear and mowing height

The wheels are an important element of the mower’s undercarriage. The tires can be plastic or rubber rings, and less frequently there are pneumatic wheels on professional models. To improve flotation on uneven terrain, some mower models are fitted with large rear wheels.

Almost all lawnmowers provide for changing the height of mowing. It is not recommended to mow more than 1/3rd of the lawn at a time. There are many height adjustment systems, with typically 5 to 7 different cutting height settings, but a professional system may have more.

Lever system for height adjustment

Most models have a lever next to each wheel that enables you to choose the height of cut. With the centralized system, all axles are moved into position with a single lever. On simple electric mowers, the wheels simply need to be taken out and repositioned.

How to attach a trimmer disc or line to the trimmer

The cutter bar is attached to the actuator. The attachment point is called the gearbox. The task of mounting a disc or reel is not difficult. The principle of fixing the cutting discs on the trimmer is as follows:

• Washer is fastened first with an Allen key
• Mount the pulley on the shaft
• Then position the upper washer and screw it on with the cage nut
• The nut must be turned by means of the socket wrench that is normally supplied with each tool
• Turn the nut in counterclockwise direction
• The shaft must be jammed with an Allen key when turning

Remove and replace the disc on the trimmer in the reverse order. For more details on how to install the lawnmower spool with a fishing line, described in this material.

How an electric motor works

Such a motor can be both single-phase, which operates from the normal network, and three-phase, which needs additional electricity. Always keep personal safety in mind when connecting an electric motor. For a single-phase motor, RCD protection must be installed, and a three-phase motor must have appropriate capacitors.

For a home mower you can also use a drill with up to three thousand rpm. Assembling the design, it is necessary to properly select the power of the haymower to its mowing. Mounted on the base or platform, a cordless or electric drill will perform its tasks well, and the grass will be mowed.

While working, you should not forget about the intervals of work, because you need to give the motor time to rest to avoid overheating. Such a tool will easily clear the area of grass and give the lawn an attractive appearance. The platform, on which the motor is mounted, should be of optimum size, so that you can cut the grass near the wall.

Step-by-step assembly instructions

Depending on the starting materials for the electric lawnmower, these steps will differ. One of the most common options is to assemble a mower from an old washing machine. It will be useful to consider a step-by-step instruction just to create such a machine.

The actions should take place in this sequence:

• Making a frame or spars under the engine of the future structure. It should be made of metal or steel sheet 500×500 millimeters.
• In the central part of the sheet you should drill a hole for the shaft of the electric motor.
• From the bottom of the metal sheet (members) the perimeter corners are welded. And they can also be bolted. Then you need to install the wheels. They can be made on their own from plywood or wood, or removed from old devices. They are placed on a shaft (metal shaft).
• After that, the motor needs to be mounted on the platform. To do this, it should either be welded on to the pre-installed metal brackets or drill holes for the existing holes in the motor itself, and then bolt it down.
• Next, you need to install a handle to control the construction.
• Under the platform is mounted a protective cover for control.
• A metal blade is installed (homemade or ready-made). It is mounted on the motor shaft.
• To protect the motor from grass it is necessary to install a can on its shaft.

All mechanical parts are assembled. Next, you need to proceed to the electrical circuit design.

The grass catcher box should be installed at the very end. It is made in the form of a box or bag.

Covering the blades with a guard is a must, because it will increase safety during work. Such protection should be done for the motor to avoid debris and its durability, as well as durability.

Choice of motor

The best choice in this case would be an asynchronous electric motor with a power of 500 to 600 W or more. The number of revolutions at this work reaches 3000 per minute. The big advantage of the asynchronous motor model is its quiet operation. The higher the engine speed indicator, the better and smoother the grass is cut.

Generally, quality of mowing will be determined not by rotation speed of blades, but by linear speed of cutting edge relative to vegetation. For the same number of revolutions per minute, the linear speed of the cutters becomes higher, based on the grip size (diameter of the circumference in which the cutting edge rotates).

Therefore, if the grip is large (more than forty centimeters), the number of revolutions of the device can be significantly reduced. But in this case the power indicator of the motor must be bigger to overcome the increasing resistance. Practice shows that the following configuration is efficient: grip. 50 cm, engine power. 1 kW, the number of revolutions per minute. 1500. But a 500W motor with rotation speed of 1500 rpm will also cut the grass, though worse. At small capacity of the engine it is necessary to sharpen knifes regularly.

To connect a three-phase motor to a single-phase system, you need to use the principle with a working and starting capacitor. Information about this connection can be easily found on the Internet. It will also be easy to find a formula for calculating the necessary capacitance for capacitors. Most often in the design use about 200 μF for a motor with a capacity of 2 kW. For 500-600 watts just 60-80 μF is enough.

Creating a special casing for the engine, it is necessary to remember about the holes for cooling the device.

To create a lawn mower with your own efforts, you can use a simple electric drill with a number of revolutions up to 3000 per minute. To come up with a method to mount the drill to the frame will be simple. But you need to understand that in terms of reliability and duration of operation the drill can not be compared with an induction motor, which is why if you have to mow a large area of the plot with grass, it is best to think about buying a powerful motor.

The drill is best suited to create a separate independent trimmer for grass. It will be very easy to install the blades in the drill. The knife with a hole in the center is clamped by a special nut on the bolt, and the bolt is clamped in the drill chuck.

Creation of the mandrel

The simplest type of mandrel looks like a disk or strip with a flange and a hole equal to the diameter of the motor shaft. The process of creating a mandrel is like this:

• The flange is put on the shaft and locked on it, the legs are attached to the strip or disk. The total diameter of the sheet will directly depend on the desired width of the grip and the length of the knives. For the ready-made mandrel you can use a pulley with a fitting diameter that fits the shaft with the motor. This will help get rid of two difficulties at once. alignment of the mandrel and its installation. But the pulley must be robust and strong.
• The mandrel should be fixed on the motor shaft. This is most often done by bolts screwed into the flange perpendicular to the axis of the shaft.
• In the form of a mandrel you can use a stone holder for a sharpener. To prevent unnecessary grass from wrapping around the shaft and spoiling it, you can cover it with a tin can.

If you do not have the necessary pulley or other suitable parts, you will have to order the creation of parts from a turner or make it your own hands from a pipe of the required diameter and welded to it circles and strips. In this case, there are three difficulties: finding a pipe of suitable length, ensuring perpendicularity of the strip or circle to be welded to the pipe and centering the mandrel after making. With some effort, all difficulties can be easily solved.

Advantages and disadvantages of homemade mower designs

They depend on the parts used to assemble.

The main advantages include:

Low noise is undoubtedly an important indicator, but, given that any lawnmower, including homemade, makes manual work much easier, it can be tolerated, so any other motor will do.

It is not advised to use the motor from a vacuum cleaner because of its rapid overheating. If you do not have another one, you can use it, too. And with overheating fight with the help of a proper cover, made of metal mesh or having holes for air circulation.

The disadvantage of the homemade tool is that the height-adjustable blade is not adjustable. But, with some skill and it can be corrected.

Safety precautions during operation

Safety precautions must be observed as when working with a factory lawnmower and homemade, because they have blades, and the tool runs on the mains.

It is important to check before plugging in the tool:

In the area to be treated, it is desirable to collect everything that can cause breakage of the homemade structure and injury to the person operating it: wooden blocks, stones, debris. There should be no children or pets in the area.