What to lubricate the shaft of gasoline grass trimmer

Grass trimmer shaft lubricant

Buying any equipment in its own way is a lottery, but a lot also depends on the gardener. In caring hands even Chinese samples serve long and do not let their owners down at the wrong moment. And if you forget to timely lubricate gear reducer of brushcutters, do not clean filters, use cheap low-quality gasoline, then the garden equipment from the most famous brands will become a headache.

Gear lubrication is one of the most important parts of mechanic maintenance of a petrol grass trimmer, which must be done directly by the user.

Time and procedure for preventive maintenance of the gearbox

I recommend routinely checking the condition of a new petrol grass trimmer immediately after purchase by adding oil to the gearbox. For all the high costs of garden equipment, some manufacturers save money and only lubricate to a minimum during the running-in period.

How often should I lubricate the gearbox of my brushcutter?

Maintenance inspection of the gearbox with the addition of liquid grease is often performed once a year at the start or end of the season. If you don’t use your petrol grass trimmer for professional cutting, it is enough.

If you work extensively, it is absolutely necessary to lubricate the gearbox of your petrol brushcutter every 20 to 50 hours. If the operating conditions of garden equipment are heavy, for example, mowing a large field at a time, and the mower does not have time to cool down, or cheap lubricants are used, then lubrication must be checked and added every 20 hours of work.

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Indirect evidence of the need to lubricate the gearbox can be overheating or increased noisiness of the unit.

Also a complete replacement of lubricant, disassembly and flushing unit, I recommend when buying a second-hand gasoline trimmer for grass.

Gear lubricant for gasoline grass trimmer

Variety of greases for gardening equipment

According to the instructions for lubricating the bevel gear should use a special transmission liquid grease. As a rule, manufacturers of garden equipment produce and recommend chemistry of their brand, as the most adapted to their devices.

At the same time, in order to reduce the operating costs of garden equipment and increase the attractiveness of the brand of automotive chemicals, lubricants for garden equipment are usually made multifunctional. It is designed not only to lubricate the gears of gasoline trimmers, but also for the treatment of hoses, gears and gearboxes of any garden equipment and mechanical devices operating under high loads.

This gear lubricant is sold in convenient tubes for use and future storage.

Even if the specialized gearbox grease is almost completely depleted during operation, additives still create an effective lubricating protective film on the gear surface.

It is necessary to notice that many owners of brushcutters on open spaces of former CIS for greasing a gearbox use usual Lithium-based Lithol-24 or grease for Cables. Filling a gearbox is easy with a 5cc medical syringe.

An undisputed advantage of using Lithium-based grease and Lithium-based grease to fill up your brushcutter’s gears is that it makes it cheaper to use. But there are nuances, because of which spears are broken on forums of gardeners Internet space. My thoughts on what can be lubricated with lithium-based grease and what not, read the article “Lithol as a brushcutter gear lubricant”.

How to lubricate the gearbox of a brushcutter, gasoline grass trimmer

Side bolt #17 on the gearbox of the gasoline grass trimmer

For safety reasons it is essential that you remove the spark plug boot / plug for all maintenance work on the brushcutter to avoid the risk of accidental starting. Do not turn the grass trimmer upside down to avoid gasoline leakage.

Unscrew the side screw on the brushcutter gearbox. Depending on the company. the manufacturer of garden tools instead of a screw under the hexagon may be a key bolt, often 17. Screws are unscrewed counterclockwise. Do not lose the sealing washer.

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If you can’t see any grease on the inside face of the screw, you need to add 3 to 4 grams. Turn the transmission by hand, changing the direction of rotation to distribute the grease on the gears.

Then replace the screw by tightening it firmly.

Removing and lubricating the mower’s lower shaft

To remove the shaft from the lower part of the boom, first remove the reducer spool.

  • Unscrew all the central fixing screw. On the other side of the lower fixing screw unscrew the nut and unscrew it to disconnect the reducer of the coil from the protective casing.
  • Loosen the upper clamping screw and remove the lower part of the rod from the reel gear housing. Remove the lower shaft from the gearbox side of the shaft.
  • Clean shaft from dirt and smear it with grease or Lithol-24, not forgetting to clean and lubricate socket (bushing) with splines in reducer.
  • Place the shaft in the boom and the boom in the lower gearbox of the lawnmower and align the hole on the boom with the hole for the central screw. Screw in the central screw. Then screw in the lower screw, clamp the lower part of the boom in the gearbox housing with the upper and lower screws and tighten the nut on the underside of the lower screw.
  • Add 20-30 ml of grease to the reducer of the spool through the hole covered by the screw on the right in the picture.

In the operation manual for gasoline grass trimmer PRORAB 8405M, 8406M it is recommended to lubricate gearbox with solidol or its analogues, in extreme cases it is recommended to fill it with liquid engine oil. Excess oil will leak out as the gearbox has no seals.

It is written in the PRORAB 8402P, 8403P, 8405P, 8406P gasoline grass trimmer user manual that two-stroke engine oil may be used as a gear lubricant. No mention of solide or its analogs.

To save yourself the hassle, lubricate your mower’s bottom gearbox with the same grease you use on the shaft of your mower, or fill it with engine oil.

Tools and supplies needed

The following tools and materials will be needed for maintenance of the gearbox:

Allen wrench for opening the lubrication hole in the gearbox

Usually, such a key is included with a brushcutter or trimmer.

The next tool is a standard 10 ml syringe. The syringe is used to inject the lubricant into the gearbox.

We recommend the use of genuine grease from the brushcutter manufacturer. As a last resort, you can use any type of rotary gear lubricant, such as Lithol 24.

Action Open the gearbox

To gain access to the gearbox, the gearbox must be opened. This is quite simple. you need to unscrew the bolt on the gearbox with an Allen key. The bolt for all brushcutters is in the same place. near the tool.

Action Filling up the gearbox with oil

The diameter of the tube with grease does not match the diameter of the gearbox

lubricate, shaft, gasoline, grass, trimmer

In order to mix the grease into the gearbox without any problems, it is necessary to use a syringe.

Then fill the syringe with grease from the tube.

lubricate, shaft, gasoline, grass, trimmer

Then put the piston back in the syringe. The grease gun is ready to add grease.

Action Refilling the gearbox with grease

Insert the grease gun in the bore of the reducer

First insert a syringe into the gearbox bore.

Squeezing some grease into the gearbox and turning it about a quarter turn

Then squeeze some grease into the gearbox and turn it about a quarter turn.

Once all grease has been squeezed out, the process is complete

Fill in small portions of grease. After each grease fill, turn the housing 1/3 to 1/4 turn. It is desirable to select the amount of grease for each filling so that the gearbox makes a full revolution during the greasing process.

Action Sealing the Geareducer

After the gearbox is filled with grease, screw in the gearbox bolt and clamp it well.

How to lubricate the gearbox of a brushcutter (easiest way)

How to lubricate the gearbox of grass trimmer or brushcutter: proper maintenance of garden tools | (Photo Video)

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Main gearbox malfunctions and remedy

Various failures can happen to the gearbox of an electric or gasoline grass trimmer. The following table shows the most frequently occurring problems. There you can also find the causes of their occurrence and methods of elimination.

Gearbox Troubleshooting Possible causes of failure Solutions
Gear unit gets very hot use of unsuitable (low-quality) lubricant or its absence The lubricant needs to be replaced or added
Gears are new and not lapped You should run in for a short time without heavy loads, with regular stops to give the mechanism time to cool down
Shaft seizing during rotation, backlash and knocking Failure or substantial wear of any of the bearings replace a defective bearing with a new one
the transmission gear comes off the brushcutter bar or is loose the housing is damaged The part must be replaced
in some cases, in the case of minor damage, with a clamp made of metal, tighten the place with a fracture
is not fixed on the pipe Wear at the mating point It is possible to wind it up with insulating tape at the attachment point or to change the shaft
the output shaft with a blade does not rotate or stops in case of an increase in load worn gears or one of the gears the interacting pair of worn out parts needs to be replaced
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Bearings are destroyed because of the use of unsuitable lubricants or lack of them. They can also be damaged by hard working conditions and by foreign particles in the brushcutter (e.g. broken metal teeth in the mechanical gears) because the integrity of the dust cover is compromised.

To remove the bearing you need to disassemble the gearbox and use a special puller. If it is not available, you may try to do it with a mallet and a mandrel. In this case, work carefully so as not to damage the seating. Using preheating to remove the bearing is not recommended. This is due to the fact that the metal can lose the desired performance characteristics.

If the blade stops rotating under load or stands still at all, it is accompanied by an abnormal sound.

Most gearbox problems can be easily fixed with your own hands. Parts you need to replace are designed for the model of brushcutter in question.

What happens if you do not lubricate in time?

If you mow with a trimmer that does not have a lubricant, the following will happen

  • The shaft will break the bushes and that’s why the machine will vibrate a lot and it will be harder to hold in your hands;
  • the gearbox will start to heat up and the surface of the gears will wear out, metal dust will get into the crankcase, so putting new grease in will no longer work, because it will act like an abrasive paste, accelerating wear;
  • over time, the reducer will stop working and when the motor is on, the knife or spool will not rotate.

How to choose the right lubricant

During operation, the nodes of the mechanism are loaded with contact forces on the teeth, resistance reactions when debris enters, as well as dynamic and impact loads. Depending on the nature of the load, you should choose what to lubricate the trimmer gearbox for grass.

When selecting, such factors should be taken into account:

  • manufacturer’s brand;
  • Viscosity of grease (this parameter depends on the torque of the shaft)
  • adhesion to the surface of the component parts of the assembly;
  • The intensity of lubricant consumption (you should consider the ambient temperature, type and volume of work).

In the absence of a required lubricant, a universal one can be used. The latter must contain some components:

  • anti-wear additives (without toxic lead)
  • mineral oils with a high degree of purity (inorganic);
  • solid lubricants with graphite or molybdenum disulfide.

Gear lubricant for popular trimmer brands

Well-known companies produce their own greases:

  • STIHL recommends STIHL Superlub FS gear lubricant for brushcutter gears, available in tubes from 250g to 80g with a specially sharpened tip for easy application and in a silver-orange color;
  • Gearboxes brush Patriot manufacturer recommends serving own production based on lithium components on the basis of the name Arsenal AR-417;
  • The company Huter for their products offers a plastic universal grease Rezoil, CYATIM, you can also apply all of the above greases;
  • In all cases, it is necessary to monitor the condition of the gearbox assembly by lubricating it at least once a month. The drive shaft can be lubricated at the same time as the gears.

To learn how to lubricate a maintenance-free gearbox, watch the video below.

Grass trimmer lubrication places

For trouble-free operation and durability of the mechanism, careful inspection and maintenance should be performed. An important point is the lubrication of moving parts. In most cases these are:

Popular among users is the multi-purpose water-resistant grease “Lithol-24”. The operating temperature range is from.40 to 120 degrees. This lubricant is used in friction units and is effective at higher temperatures.

How to use the grass trimmer correctly?

The only way to extend the life of the grass trimmer is to use it properly. Unfortunately, some manufacturers of chain saws are not interested in the very long service life of their products, that’s why some rules that help to use the machine more carefully are not included in the manual of the gasoline trimmer.

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For this reason, we recommend carefully following all the recommendations in this article, even if they are not in the instruction manual, because we have made recommendations based on it:

  • The experience of many owners of such devices, which they shared on the pages of various forums;
  • Advice for brushcutter repairers;
  • Recommendations from the manuals of the most expensive and quality brands of trimmers.

As the grass trimmer operation involves not only mowing the grass, but also many other actions, we have divided it into the following topics:

  • The engine running-in.
  • RPM selection.
  • Mowing direction.
  • Choosing clothing and protective gear.
  • Safety Precautions.
  • Transportation and storage.

Engine running-in

Despite the fact that the motor just bought a grass trimmer is running in and you can immediately start mowing the grass, the first 3-5 hours avoid maximum speed, because there is a final lapping of the details of the cylinder piston group.

If you allow the output of the motor at maximum speed, there is a high probability of the appearance of scuffing on the walls of the cylinders, and this will lead to a sharp decline in motor efficiency, as well as greatly reduce its resource.

RPM selection

Maximum engine torque occurs at 2/3rds of full throttle, and maximum power at 3/4rd of full throttle. The grass trimmer mows most effectively in this range.

Maximum rpm is a bit lower than maximum rpm, that’s why you should always look at the grass trimmer while cutting the grass and check its rpm.

If the load is too high and the power unit shaft speed decreases, add more throttle with the corresponding button on the operating handle.

As soon as the workload is reduced and RPM increases, press the accelerator pedal less to get the engine back to its optimal speed.

If you have never used a brushcutter before, you should only mow low and light vegetation until you have got used to it and it is easy to handle with the line trimmer head. After the running-in period, the engine will no longer be afraid of maximum speed, and you will have enough skill to operate the engine by ear.

You should also avoid running the engine for a long time at idle speed, because this reduces the lubrication of the crankshaft bearing, which can lead to its overheating and seizure.

Mowing direction

When working with a brushcutter in maximum grass pickup mode, move the brushcutter so that it runs counter to the direction of rotation of the cutting attachment.

In this case, the knife or disc will push the machine away from a possible obstacle, so the grass trimmer will not jump out of hand.

In addition, this movement of the blade or head throws the grass in front of you, so you can better feel the resistance of the mowing, and therefore avoid too fast movements and the resulting effects:

For most trimmers, the correct direction of cutting is from right to left. When moving in the opposite direction, the grass trimmer continues to cut the grass, so there is an increased likelihood of a reverse impact, which can cause the machine to jerk violently. Therefore, try to grab less grass when going in the opposite direction to reduce the stress on the machine and the chance of backhitting.

The choice of mowing direction in maximum vegetation capture mode is particularly important:

Also, when trimming trees, try not to lift the cutting tool too much or turn it perpendicular, because this can cause the carburetor to malfunction.

This requirement is not relevant only for brush trimmers, whose carburetors work equally effectively in any position.

Choice of clothing and protective equipment

Your grass trimmer is a high-risk product, so you should wear proper clothing and protective gear to operate it.

If you are going to mow grass wear only clothes without any straps and fringes which can get caught in the rotating cutting tool.

If you wear shoes with laces, make sure they do not come undone. If you have long hair, limit its movement by wearing a hat or tying it up with something. Always wear goggles or face shields as there is a probability the cuttings will fly to a wrong place and will hit the eye.

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