How to remove a knife from a Huter lawn mower

Editing edges

When the blades are sharpened, they need to be straightened. This is done using a piece of moisture-resistant sandpaper with a grain size of about 600-800 grit. The paper should be moistened with water and rolled into a cylinder with a diameter of 100-150 mm.

Editing aims to remove the slightest burrs and flakes that can wrap around the thinnest edge of the blade. The sandpaper rolled into a cylinder should be lightly pressed against the descent plane and pulled out with a smooth movement from the grain. In this case, it is also recommended to make a smooth offset from the center to the edges.

When removing the triggers and sharpening, all manipulations were carried out with only one side of the blade. During the dressing process, the knife is also processed from the back side. Here the paper is pressed almost close to the body of the knife, but with a slight tilt towards the edge. The paper clamping force during dressing is very small, but a lot of movements need to be made, trying to eliminate large scratches on the brilliant escapement that remained after sharpening.

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For reference: you can also sharpen a lawn mower knife with a rivet, by analogy with a conventional manual scythe. This, however, requires a special adaptation. grandmother, as well as a specific skill. But on the other hand, with this method of sharpening, you will not need to balance the knife.

Sharpening a lawn mower knife from Lenfilm studio

We tried our best. If you are not very happy, then take a look at our website. There we sorted out the “flights” in detail.

Balancing check

Before attaching the blade back, you need to make sure that its shoulders are at least about the same weight. Otherwise, vibration will occur during operation, which will not have a positive effect on the durability of the spindle.

Balancing is carried out mainly for double-sided single and compound knives, four-bladed ones are not so strongly subject to imbalance. To check the knife, you need to clamp a smooth bar in a vice in a horizontal position. The blade is put on it through the hole in the center, after which attempts are made to install it strictly horizontally. If one of the shoulders weighs significantly more than the other, the knife will steadily turn to one side.

The shoulder weight equation is carried out by grinding a small amount of metal from the back of one of the knife arms. It is not necessary to achieve ultra-precise balancing, however, the knife should be held in a strictly horizontal position for at least a few seconds. When balancing is done, you can put the knife back in place and finally refresh the look of your lawn.

Matrix Turbo lawn mower blade adapter

Unfortunately, Matrix-direct has ended support for this product. In service centers that are on the list.
Turn the mower over to access the cutting tool;
Fix the knife with a wooden block;
Using the right tool, usually a socket or box wrench, unscrew the knife attachment points;
Remove the knife itself.

After cleaning the knife from adhering grass, dirt, you can proceed specifically to sharpening.

To sharpen a lawn mower knife, you will need a stable base. a table or workbench, on the surface of which you can comfortably position and fix the knife for final sharpening. Balanced option. if you have the ability to secure the knife in a vice.

When doing the work, keep in mind that the working part of the knife is hardened, you should try to make the impact on the blade as small as possible and keep the angle of sharpening of the lawn mower knife.

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If the working parts of the knife are not damaged. burrs, notches, then you can limit yourself to dressing the blade. For which you can use an abrasive bar or a diamond-coated file. It is not required to remove a large amount of metal, and you can get by with a “thin” tool.

If the knife blades are damaged, they must be removed before sharpening with a coarse file, on an emery wheel or with an electric tool with an abrasive attachment.

Bosch Rotak 37 LI how to change the knife on a lawn mower

Bosch Rotak 37 LI how to change the knife on a lawn mower.

Rotary lawn mower blade sharpening.

Rotary devices include:

Gasoline lawn mowers;
Electronic lawn mowers. wire and battery.

In their equipment, they use mainly two-bladed knives, less often a knife with 4 blades. The sharpening technique for all types is the same, and does not have any differences.

To complete the work you need:

Work gloves;
A spanner or end wrench of the corresponding size;
A set of ratfil, an abrasive bar, or an electronic sharpening tool.

larix, thanks for the advice. And just in time Tatiana asked her own question. Thank you! You can’t drag the mower to service.

MAKE A DROP POINT HUNTER (Full Tang) Hunting Knife DIY

And I’m not sharpening at all, once a season I buy a new knife and no hassle.

Rom165, I would also do this, but I have already climbed the entire Internet, but I did not find the knives. Where do you buy? And they probably differ depending on the brand and company? What kind of mower do you have? If this cannot be written in the subject, please write to me in a personal, if it does not make you more difficult.

Tatyana65. In general, there is no need to sharpen a kitchen knife to the sharpness. In practice, it is enough to carefully remove the burrs with a ratfil or an abrasive bar, without touching the metal of the entire blade, so that the surface of the blade is even and does not tear the grass. After all, the imbalance may seem due to the difference in the mass of the “wings”, acquired from too much and unevenly removed when sharpening metal. Therefore, who does not know how, it is better not to approach the electric grinder. But if you are careful and not in a hurry, you can remove the burrs with ratfil without even removing the knife from the mower.

larix, thanks! It never even crossed my mind! You must first experience it this way. Doesn’t help. then go to the workshop.

Balancing

A balance check is performed before installing the knife on the garden equipment. It aims to find out whether the blades of a knife have the same weight. To do this, a sharp strip is put on a pencil with a central hole. The shoulders should be balanced and equal in weight. If one of the sides pulls down, then grind it down a little again.

Rotary lawn mower blade sharpening

Gasoline lawn mowers;
Electronic lawn mowers. wire and battery.

In their equipment, they use mainly two-bladed knives, less often a knife with 4 blades. The sharpening technique for all types is the same, and does not have any differences.

To complete the work you need:

Work gloves;
A spanner or end wrench of the corresponding size;
A set of ratfil, an abrasive bar, or an electronic sharpening tool.

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Before you start sharpening the mower knife, you need to perform several preparatory operations:

Prepare the mower to remove the knife. In particular, this step should be taken into account by the owners of gasoline models of lawn mowers. It may be necessary to drain fuel, oil;

Sharpening the spindle lawn mower blade

Drum (spindle) lawn mowers are equipped with a knife block. a drum formed with several curved blades and a fixed straight knife. It may seem that sharpening such a knife is very difficult, but it is not. You don’t even have to remove the spindle.

To sharpen the spindle knife, you need abrasive. sandpaper, preferably waterproof.

From a sheet of paper it is necessary to cut a strip in width 1-2 mm larger than the width of the fixed knife and stick it on the fixed knife of the lawn mower using double-sided tape, upside down with the abrasive applied.

Then bring the knife drive into action. Hand-held drum mower. ride on a flat hard surface several times, if you have an electric drum mower, connect it to the mains, turn it on and let it run for a short time, 1 minute is enough.

Remember to remove the sandpaper from the stationary blade before using the lawn mower.

As you can see, sharpening the knife of any lawn mower is not so difficult and every owner of this type of garden equipment can do this work.

Step by step process

  • Before removing the knife from the mower, fix it with a sturdy board or log resting on the ground. It is necessary that the knife does not move when it is removed. However, some neglect this safety measure and simply hold the insert with their hand.
  • An L-shaped socket wrench or box tool is taken, ideally suited to size. The use of pliers is not recommended. This fitting and assembly tool easily spoils the edges of the bolts.
  • Usually the cutting unit is secured with one large bolt located in the middle. Modern models have several fasteners. As a result, you will have to unscrew them all.
  • Bolts are most often right-handed. Therefore, to unscrew the bolt, turn the key counterclockwise. In order to screw it back, it is done the other way around, that is, tighten the bolt clockwise.
  • It happens that over time, the threaded pair sticks, rusts, and it becomes problematic to unscrew the bolt. In this case, special lubricants are used, called liquid keys.
  • If the removal was successful, and all fasteners are intact, then the bolts, nuts, washers are removed into the box for safety. These connections may have to be reused.

Additional Information. Before removing the knife, you need to remember its position. Most often, knives are placed counterclockwise with a tip, and the rotation of the element occurs in this way. However, this advice does not apply to all models. Therefore, attention should be paid to the position of the element. It is in the same position that you will have to put a new knife or screw the old one after sharpening.

Reasons for removing the knife

Common reasons for removing or replacing a cutting element are as follows:

  • The knife is dull;
  • The element is bent and deformed;
  • Chips and cracks are visible on the knife;
  • The blade has worn off and thinned.

When the knife is dull, bent or deformed, the lawn looks untidy after mowing. Competent sharpening will correct the situation.

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Professionals advise to carry out the procedure once a year. It is better to do this in the spring, before starting work. If the cutting elements become blunt faster, then sharpen them more often.

Knife sharpener

If chips, cracks are visible on the blades, or it has sharply worn off and become thin, then replacement is necessary in this case. There is no point in sharpening such a tool. In addition, the blade can break at any time and fly out from under the machine body, injuring people or animals that are nearby. Such a device can also damage the engine. It is allowed to change an element to a similar model. The characteristics of the knife are indicated in the instructions.

Lawnmower knife functions

The lawn mower blade performs the function of mowing grass. Knives are made of high quality steel. The sharpening of the knife affects the performance of the work. The sharp tool cuts plants evenly. Blunt. leaves a fringe on them, that is, a cut of each blade of grass is cut perpendicular to the surface into several parts. This happens if you tear the grass with your hands. As a result, the cut of the grass cut neatly and evenly is delayed the very next day. Such a lawn looks attractive and bright. In the second case, the area in front of the house turns out to be a dirty green color. The dissected sections are tightened only after 10-18 days.

Lawn mower knife

Note! An additional function of the blade in the lawnmower is to create an air flow during rotation, through which the plants are transferred to the grass catcher. For this, the blades often have several special serifs.

File

In the first case, work is organized if the blades are in relatively good condition and are only slightly dull. Usually, this sharpening is used if the owner sharpens the cutting elements of his garden tools several times per season. If this is the case, then it will be quite enough to walk along the edges with a file and correct them.

During work, the curvature of the knife, roughness are removed. It is important to maintain the factory-cut angles and descent. Both sides (blades) are grinded evenly. The sharpener is kept in the same position. Imbalance must not be allowed, in which case the well-coordinated work of the blades cannot be achieved. Such a problem will lead to operational wear of assembly units (bearings).

After the main sharpening, it is necessary to edit the edges. This is done in order to remove the smallest breakages. It is best to use 800 grit sandpaper. Editing consists in slightly shifting the paper along the plane of the descents.

Note! Instead of a file, you can use a sanding stone. Before the procedure, it is soaked in soap and water for a quarter of an hour. During operation, it is also allowed to slightly moisten the tool.

Balancing

A balance check is performed before installing the knife on the garden equipment. It aims to find out whether the blades of a knife have the same weight. To do this, a sharp strip is put on a pencil with a central hole. The shoulders should be balanced and equal in weight. If one of the sides pulls down, then grind it down a little again.