How to change a knife on a lawn mower. Bosch Rotak 37 Li how to change a knife on a lawn mower

How to remove a knife and make a new one for a lawn mower with your own hands: dimensions, drawing, video

If the disk on the trimmer is used regularly, it needs to be removed from time to time to remove and sharpen or change it to a new. This part can be made of metal or plastic, have a different number of blades, but the replacement process remains the same. Over, this procedure is similar to the equipment of different manufacturers, whether Carver or Huter, but minor differences are possible. Changing the knife on the trimmer is quite simple if you observe safety precautions and know the correct procedure for which you can find a description of which you can in the user’s instructions. The whole process of replacing step by step, as well as the way of independent sharpening of knives, will be described in this material.

After preliminary editing of the cutting part, you can proceed to sharpen the lane of the lawn mower. It is necessary to ensure that all chips, zabins and deformed areas are removed from the cutting edge, and the descent of the cutting edge was one even plane. For this, it is recommended to work slowly and carefully.

The sandpaper is the simplest and most affordable tool during sharpening knives for lawn mowers. It is recommended to take a grinding stone with granularity from 400 to 600 grit. Before using the bar for 10-15 minutes, can be kept in a soap solution and during sharpening the grinding surface is periodically moistened with water or a weak solution of food salt.

When hidden knives for the lawn mower, it is important to keep the stone in the same position, otherwise there is a risk of straying and making the cutting edge of the uneven. It is important to ensure that an equal amount of metal is removed along the entire length of the knife, otherwise the balance will be removed incorrectly

How to Replace a Lawnmower Blade. Bosch

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How to do it with your own hands

Postering blades must be replaced, but there is no need to buy a factory.Made coachor. The blade can be made independently and replace them as necessary. Homemade knives can be more expensive than factory ones, but their presence will help save time spent on the repair of the lawn mower.

For the manufacture of homemade knives, instrumental steel is required. Strips of 3 mm thick and 20-50 mm wide are best suited. If the surface of the lawn is uneven, and the soil is rocky, then it is recommended to take the blanks thicker. In this case, it is necessary to take into account the fragility of the material and its stability in the fragment. Inappropriate blades, having broken, can damage the car.

The easiest option for a lawn mowing blade looks like a long steel strip, attached symmetrically relative to the axis of the tool. In this case, you need to take a blank 30-50 cm long.

There is a second common option-two short homemade knives of 50-80 mm in length attached along the edges of the axis. It is important that the angle between them is exactly 180 ° to preserve the balance and symmetry. Such blades are located both directly and with a slight slope relative to each other. Blades are attached with one or two bolts.

Regardless of the chosen version of the workpiece, you need to sharpen and balance.

The above methods are suitable only for devices with steel blades. Plastic knives for a trimmer for grass at home is problematic to straighten. When breaking such an unit, you must contact the service center.

The main stages of work

First, it is necessary to drill through the center of the plate through the hole, and cut the thread in it under the diameter of the hairpin. Next, we bend four strips of metal at an angle of 90 degrees. We weld two of the blanks to the plate, and the two remaining ones are to previously welded stripes, and additionally connect them using another strip.

By the end of the hairpin we weld a metal rod so that it is more convenient to unscrew and tighten the device. The resulting design is cleaned with a corner grinder, after which we cover with 1-2 layers of aerosol paint. Cut the hairpin in size and screw into the hole in the plate, putting the nut after putting it on. Now the device is ready to work.

We turn the lawn mower to the side, block the cutting knife of the lawn mower and fix the frame of a home.Made device to the body due to rotation of the stiletto. See the step.By.Step process of manufacturing and assembling this design in the video on the site.

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Sharpening of a lamp knife from Lenfilm Studio

We tried as we could. If you are not very happy, then look at our website. There we have sorted out the “flights” detail.

When the knife is removed, it needs to be cleaned the first thing from adhering dirt and hardened herbal juice. The easiest way to do this is to use a metal kraitsy. The knife strip should be clean from all sides: not to a metallic shine, but without the smallest sticky fragments.

Often, due to the entering the working area of ​​solid items, such as stones and chips, the blade is very noticeably deformed. Most of the blades themselves are not straight, but the cutting edge and strip 10-15 cm from it must be examined for the presence of local tubercles and curvatures. This is done using a short even line.

You can straighten the blade with an ordinary hammer, in which the edges of the box are slightly rounded. The knife is laid on an even massive support (anvil), then the correct shape is given with weak blows of the metal. You need to rule the knife, starting from the edges of the curved area, gradually moving to the center. The curved body of the blades is a small problem, but it is very important that the cutting parts are straightened into one straight line for a trimmer. You also need to check the casting blades that often extend from the blow. If the blades are bent at different corners on different shoulders of the knife, this will worsen the air flow and the mowed grass will not be mulched properly.

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The next stage of service of the lawn mower: cleaning

High.Quality care for the lawn mower is impossible without elementary cleaning of the deck and engine from the grass.

Delivee of deck from vegetation

The grass itself has an incredible corrosive effect on the unit, so it is necessary to periodically clean DEKO. It is important to understand that a wet lawn cannot be mowed in any case, because then the negative influence will increase by 2 times.

Dry vegetation itself will disappear from the object, and it will be possible to clean it with the most qualitatively using an air compressor or blower. Some models are equipped with a special flushing fitting that saves the user from additional troubles.

Delivery of a motor from vegetation

Since the motor motors are supplemented with air cooling, the entire system will work qualitatively only if the ribs are not polluted. Otherwise, you should expect overheating of the device and its quick failure.

Ribs can be cleaned by removing additional engine parts and the use of compressed air. Even a soft small brush is perfect, which in this case will demonstrate excellent efficiency.

Phased execution

To properly sharpen the lane of the lawn mower, there is no need to look for a master. If you know how to handle manual and mechanical tools, then without even having skills to sharpen knives and blades, but doing everything strictly according to the instructions, immediately learn to sharpen the cutters for mowers yourself.

To remove the knife, perform some actions.

  • Place the lawn mower so that the bolt holding the knife is easily available to you.
  • So that the shaft does not spin, put a wooden block under the knife.
  • Try to unscrew the nut with a 19 mm key. The size of the nut may vary. On many models of mowing, the knife is fixed by means of the central bolt, and is held with a grove-shaba with a nut.
  • If the nut does not turn off so as not to tear the edge of the bolt or key, soak the threaded connection with oil or grease. Leave it in this state for several hours.
  • With a lack of effort on the key lever, hit with a hammer in the direction of turning the nut. Counterclockwise. In the vast majority of cases, the nut can be removed without problems.

The last two actions will save you an adapter, fastening the shaft of the engine or gearbox to the knife. Without it, a spindle mower will not work. If the cutter has not been removed with your own hands, then contact the workshop.

How to: replace / change blade of Bosch Rotak cordless electric Lawn mower 43, 40, 37, 34, 32, 36 LI

With slight damage, the cutter is sharpened and without removal.

Cleaning and editing

After removing the knife, clean it from dried herbal residues and dirt. There is no need to clean it to a metallic shine. But there should not be anything extraneous on the blades themselves.

If the knife is jagged and bent, it must be straightened.

Straightening is carried out using a hammer and an iron bar or a piece of rail that serves as an anvil. When new breaks and cracks appear when aligning the knife, it is useless to restore such a pin. If after aligning the cracks is small. Flow the cracked strip of steel until the knife canvas becomes completely even.

Removing the descents

Descents of the knife canvas. The border zone between the base of the working part and the facet of the tip. As for kitchen knives performing completely different functions, descent to the tip has their normative scatter of indicators.

Deriving on a knife of even and clear descents. Half of success in restoring the original.

The mowing knives use mainly “single.Sloping” descent. Too “steep” descent (30-60 degrees)-as well as too “gentle” (less than 30 degrees) will lead to a rapid bluntness of the tip, quickly loss of their cutting properties. On the cross section of the knife, the launch of the cutting edge should not be crooked. A flat descent, unlike rounded, is much more strokes to pollution and lighting in cleaning.

Sharpening of blades

Knives for a mowal sharpen with the help of:

  • Chisel, files and sandpaper;
  • Corner grinder (using grinders);
  • Electric drill or any engine with a special nozzle, on which a round sharpener is attached;
  • On the emery machine.

Make sure that there is no dent, notch and potholes on the blades of the knife. For high.Quality sharpening, you will most likely need a vice. They will hardly fix the knife in a position ideal for quick sharpening. Small notches and potholes are removed with a chisel or file or a rough grind.

Knife cleaning before sharpening

Before sharpening the knife, it is thoroughly cleaned. On steel stripes, plant juice and small particles of grass accumulate. At the same time, the juice hardens over time and turns into a hard crust. It is not worth washing the blades, it is best to choose a sharp metal scraper in the garage or apply a shade brush.

Do not polish the cutting element of the machine to shine, the main thing is to remove the adhering waste. After that, it is necessary to improve the knife, straightening it and deleting all the irregularities. Bugrs arise due to the entry of solid debris, stones on the blades. The correct option in this case is to work with a hammer. With the help of this tool and a flat work surface on which the knife is placed, you can correct all local curvatures.

Knife cleaning before sharpening

change, knife, lawn, mower

Experts advise starting to align the blade from the edge, gradually moving to the middle part. As a result, the steel strip should become as flat as possible. Only in this case it will be able to perform its function, creating an air flow that transfers grass to the tank to collect plant residues.

Cleaning and editing

First, the working part is cleaned of dirt or garbage that stuck to it during operation. The most suitable tool for this work is metal brushes (tiles). After cleaning the blade, degrease the surface and inspect the damaged knife.

Due to small solid particles that fell under the tool during operation, the coach may be deformed. Inspect only the cutting edge of the mowing blades for curvature, since the blade itself is complex. The damaged tool is straightened with light beats of a hammer with rounded edges. You need to put a knife on a hard surface, such as an anvil. This should be fixed, starting from the edges of the deformed area and gradually moving to the center.

Balanced the knife

Blave balance is an important point in the operation of the lawn mower. Without this, the cutting elements will create constant fluctuations, which reduces the durability of the equipment and complicates the work. First of all, this is important for tools with bilateral single blades, for other types it is not so critical.

To check the balance, it is necessary to fix the smooth and thin bar in a horizontal position, holding the end with a vice. After that, the blade is placed on the pin and fixed. If there is no balance, the ends of the knife can move relative to each other.

To correctly balance the blade, the metal is first polished from the back of the coater to remove excess weight. It is impossible to achieve the right balance at home. For effective operation of the lawn mower is enough for the car knife to remain in a horizontal position for some time.

Sharpening of the blade

After preliminary editing of the cutting part, you can start sharpening the Blade of the lawn mower. It is necessary to ensure that all the chips, pins and deformed areas are removed from the cutting edge and that the cutting edge is lowered into one flat plane. It is recommended to work slowly and carefully.

The grinding circle is the simplest and most affordable tool for sharpening knives for lawn mowers. It is recommended to take a grinding stone with cereals from 400 to 600 cereals. Before use, the bar is kept for 10-15 minutes in a soap solution, and during grinding, the grinding surface is periodically moistened with water or a weak solution of salt.

When sharpening the blades of the lawn mower, it is important to keep the stone in the same position, otherwise there is a danger of knocking it down and make the cutting edge uneven. It is important to make sure that the same amount of metal is removed along the entire length of the knife, otherwise the balance will be displayed incorrectly. An exception to this rule is a knife for a lawn mower with four blades: due to the number of working elements, such details are insensitive to an imbalance.

change, knife, lawn, mower

An excellent assistant in the farm is the lawn mower. With its help, they put things in order and give aesthetic appearance to herbal plantations (lawns). In order for the lawn mower to work properly, it is necessary to monitor the condition of its knives. Proper sharpening of the lashes of the lawn mower will bring the expected result from its use. Self.Sharpening of the blades of the lawn mower is strongly not recommended, qualified specialists should be done by this. Sharpening master, has certain skills and a special tool for this. Having trusted the work to the professional, the sharpening results will be the most positive. This will also save its free time and get rid of the undesirable breakdowns of the lawn mower.

Below the lawn mower there are blades (there may be two or one) that rotate the grass with rotating movements at high speed. It should be emphasized that the lashes of the lawn mowers should cut off the stalks of the grass, and not tear it out. To achieve this effect, knives for lawn mowers should always be sharpened.

Sharpening of a lane of a lawn mower is a complex and time.Consuming process. But our masters are ready to share their experience.

How to sharpen a knife for a lawn mower properly

A knife for a lawn mower before sharpening must be pre.Removed. Initially, you need to turn off the lawn mower and, for more confidence, unscrew the spark plugs or disconnect the device from the mains. To remove the lawn mowing knife, it must be turned onto the side, then unscrew the knives attaching bolts and gently remove the blades. To comply with safety rules, while removing the lanes of the lawn mower, it is best to use special gloves that protect hands from possible injury on the blade of the apparatus.

Knife sharpening

The non.Standard shape of the lanelik knife complicates the sharpening process.

If there are certain skills and the necessary experience from how to sharpen knives, then knives for the lawn mower can be sharpened on your own. For this, special equipment is also needed.

But in order not to spoil the knife and not break the lawn mower, it is best to entrust such a tool, real professionals. A knife for a lawn mower must be sharpened evenly to maintain a knife balancing. Incorrect sharpening can lead to a weight of one edge of the knife, and subsequently during operation, the lawn mower will vibrate very much, which can lead to its breakdown.

A knife for a lawn mower

Like all metal products, a knife for the lawn mower has been stupid from time, the metal is erased, and small burrs appear on its edges. A knife for a lawn mower is best entrusted to sharpen a real professional. Sharpening of a knife should be carried out on specialized equipment (a sharpener with a diamond coating), knife balancing is checked by a special tool.

Rules for installing a knife

After the knife is subordinate, it should be put back. Installation of cutting elements is not a very difficult matter. The main thing is to follow the rules:

  • Determine in what position the knife was before.
  • In the same position, fix it with a new or old bolt, washers and nuts.
  • You can’t pull the nuts too much. This will lead to deformation of the cutting device.
  • During operation, you should put thick gloves in your hands. It is important to remember that the updated blades are sharp.
  • After the mower is on the ground in its usual position, it is not recommended to turn it on immediately. It is necessary to wait an hour so that glass oil is from the walls of the crankcase.

With the wisdom of removing the cutting element from the lawn mower, even a novice gardener can figure out. However, with independent sharpening, you should be extremely neat so as not to get hurt and not remove too much metal, thinning the knife.

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