How to Install a Knife On a Trimmer Correctly

I want to devote today’s article to the sore topic of summer residents and gardeners of the entire post-Soviet space “How to refill a fishing line into a trimmer.” Not many trimmer manufacturers answer this question in their operating instructions. Therefore, it is difficult for ordinary gardeners to figure out how to do this correctly.

I want to start with a brief description of the technical characteristics of the trimmers.

So, trimmers are electric and gasoline. The cutting element of the trimmers can be a fishing line and a knife. The fishing line is ordinary, four. pentahedral and intertwined (in the form of a pigtail). Knives come in 2, 3 and four blade blades. Knives are also plastic and metal.

The feed system of the fishing line from the trimmer is manual, semi-automatic and automatic.

Development engineers who create new models of trimmers clearly calculate the diameter (thickness) of the fishing line and the number of knife blades according to the power of the trimmers. Otherwise, the engine is overloaded, which as a result leads to its breakdown. And this is an additional and significant cost.

Today on the market are trimmers:

With one nozzle. only fishing line.
With two nozzles. fishing line and three-four-blade knife.
With one nozzle. only a three-four-blade knife.

Our Kulibins long ago learned to improve any mechanisms. So, for example, some gardeners make successful, in their opinion, replacing the fishing line with a metal cable, or fishing line. But at the same time they do not think about the safety of their and their loved ones, because, as a cable with the power of a working trimmer, it can easily break out and not only injure the mower and others, but leave it crippled for life. Using fishing line can and gives a better effect, I have never personally tried it than fishing line for trimmer, but this work has a number of inconveniences: when it comes into contact with solid objects it dissolves or can simply be pulled out of the reel without limit.

So what is called closer to the topic. I give an example of how to fill a fishing line into a trimmer (BOSCH Art 30 trimmer). Everything is very simple. We started.

After you have chosen the fishing line for refueling, you need to cut off the necessary amount of fishing line, because all the fishing line in the skein is not wound into a reel.

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Cut off and start winding.

Remove the coil and the protective cover from the coil.

They took off. We fix one end of the fishing line into the gap and carefully and evenly wind the fishing line.

The amount of fishing line should be such that the protective cover of the reel closes and the line on the reel unwinds itself a little.

The second end of the fishing line is planted in the hole on the protective cover.

Next, take the coil and the protective cover of the coil. We sink the end of the fishing line from the reel into the metal hole on the protective cover of the reel. Tighten the fishing line a little.

We put it all on the trimmer. Turn the coil clockwise until it clicks.

Secured. Now connect the trimmer to the network. We put the trimmer in the starting position for the job. Turn on the trimmer. The excess length of the fishing line will be cut off on the cutting blade.

Trimmer Coil

That’s all starting work.

You can watch the video

A little tip. Make sure that the fishing line does not come into contact with solid objects when cutting. With this contact, the fishing line will be cut. And since, in this trimmer, the fishing line is not fed automatically, then you have to stop the work each time, remove the reel and re-release the fishing line.

In my trimmer, in addition to the standard line for mowing the lawn, there is still provided a thick fishing line for mowing coarse weeds. It has the shape of a pigtail, i.e. Three fishing lines are tightly intertwined. Such a fishing line has its own reel.

Thick fishing line

It is stored at the top of the trimmer body.

Video: How to Install a Knife On a Trimmer Correctly


Spare coil storage space

Installing such a fishing line into the reel is very simple. according to the internal circuit inside the reel. We insert the center of the fishing line with a metal mount at the top of the reel, and draw the ends of the fishing line along the grooves and bring it out.

Reinforced Fishing Line

Such a coil is attached to the trimmer as well as a reel with ordinary fishing line.

How to Install a Knife On a Trimmer Correctly

Sometimes, in the midst of intense grass mowing operations, your trimmer begins to make unpleasant, grinding sounds. This complains about the lack of lubrication of the gearbox. the most intensively loaded unit of the device. And soon, these “warnings” may be followed by jamming of the drive.

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What grease should be used for the trimmer gearbox?

In the process, the mechanical part of the trimmer is loaded with contact forces on the teeth, resistance reactions from adhering grass (sometimes with dirt), dynamic, impact loads due to constantly changing torque. The grease for the trimmer gear must fully take into account these features, so the selection of the brand must be strictly individual.

The following factors are taken into account:

  1. Brand of the manufacturer. Each brand is not unreasonably oriented on lubricants of its own manufacture (you can talk about cheap Chinese products later). This applies to manufacturers such as Husqvarna, Stihl, Huter, Makita, etc. The exception is domestic trimmers: for example, Caliber in the user manual does not indicate the brand of lubricant at all.
  2. The viscosity of the lubricant. As you know, all lubricating compounds are divided into three groups. highly viscous (colloidal systems containing various additives), plastic compounds of universal use and solid lubricants that soften during operation.
  3. Good adhesion to the surface of the gearbox parts, as a result of which the grease is not squeezed out into the gaps or out of the assembly.
  4. Gearbox lubricant consumption rate. Here you have to rely on your own experience and the recommendations of specialists, since some trimmer manufacturers, relying on the availability of their own service centers, generally do not give clear recommendations regarding the period of operation of the gearbox between two lubrications.

The lubricant consumption also depends on the temperature at which it retains its lubricity. When the gearbox is heated to 40 ° C, it is considered that its operating conditions are satisfactory, and there is enough lubrication.

It is believed that there is no universal lubricant for the trimmer gear, but this is not entirely true. In fact, a suitable lubricant will be one in which the following components are present:

  • Anti-wear additives containing no toxic lead;
  • Solid lubricants with the presence of graphite or molybdenum disulfide (the latter is preferable, since the lubricity is fully preserved for a wide range of shaft revolutions);
  • Only mineral (inorganic!) Oils with a high degree of purification.
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These requirements are fully met by Gear Grease OREGON or Champion EP-0 lithium greases, domestic compositions Oleo-Mas, Litol.24, or Azmol 158, as well as those recommended by the manufacturer of a particular trimmer model.

How to lubricate the trimmer gear?

In the upper part of the housing, where the gear block is installed, there is a technological hole, which, when the trimmer is operated, is plugged with a screw. This screw is unscrewed, and 1.5. 2 ml of grease is introduced into the hole using the nozzle on the tube. If the lubricant was purchased in a different packaging, then for this operation, a regular disposable medical syringe is also suitable.

After that, the screw is installed in its original place. This procedure, regardless of the user’s recommendations, should be performed every 10. 15 hours of operation of the trimmer in operating mode. Other reasons for updating or replacing the gearbox lubricant are independent minor maintenance work (for example, cleaning and washing the gearbox gear before the summer season), repair of the unit, preservation of the trimmer for the winter period, etc.

If the gear unit is disassembled, it is recommended to completely remove the remains of the previous grease from the surface of the parts, even if it does not have any signs of oxidation and contamination. And only then apply new grease. After applying the lubricant, it is recommended to turn the shaft manually several times, and make sure that the lubricant is evenly distributed over all parts of the gearbox.

When lubricating, special attention is paid to the following elements:

  1. Flywheel: on its surface, as a rule, the remnants of grass adhere intensively, and thickened grass juice creates additional resistance.
  2. The starter coil dog, which is constantly in contact with the grooves on the flywheel when the drive is turned on. In this case, not only mechanical wear occurs, but also mechanochemical corrosion of the flywheel-dog joint, since the materials for this pair are different (the flywheel is aluminum and the dog is steel).
  3. Bearings, if their seals are worn, and through them the grease is squeezed out. In this case, the unit begins to vibrate intensively when loaded. This happens with Chinese-made trimmers, so it’s worthwhile in the future to think about replacing the bearing assembly with a better one, for example, from the Swedish company SKF.