How to maintain a petrol lawn mower?

The proper maintenance of a petrol mower is important if you want to keep your machine as long as possible.

How to do it ? What are the actions to follow and the elements to control? Find all the answers to your questions in our guide.

  • Security
  • Air filter
  • Blade housing
  • Cutting blade
  • Engine oil and oil change
  • Spark plug
  • Wheels

Because we don't mess with security

Even when the engine of a mower is turned off, the machine still remains dangerous. That’s why, when servicing your petrol lawn mower, you must wear protective leather gloves to avoid cuts and above all, remove the antiparasitic of the head of the candle.

The 6 important points for the good maintenance of a petrol mower

Air filter :

To understand the importance of maintaining the air filter, it is necessary to know its role in the proper functioning of a heat engine. Without going into detail, it should be noted that the mixture that allows the explosion inside the cylinder is composed of gasoline and ... air. The latter must be free of foreign particles such as dust. Otherwise, the explosion would hurt and the engine would eventually become dirty.

This is why it is important to regularly check the condition of the air filter of your petrol mower. Ideally, blow your compressor blower to remove dust and residue after each use.

When properly maintained, the air filter does not normally need to be changed (unless it is damaged).

Smart tip : If you don't have a compressor, you can use a dry air canister.

Blade housing:

This mower organ is there for you protect of the blade and any stone projections. Although its importance may seem secondary in the maintenance of a petrol mower, there are still certain things to do if you want to preserve its lifespan:

  1. After each use, clean the blade housing with a wooden or plastic tool so as not to attack the coating paint.
  2. If necessary, finish cleaning with a low pressure water jet and a brush. The use of a high pressure cleaner is strongly discouragedbecause water would eventually seep into the various bearings and cause them to rust.
  3. To protect the crankcase against the onset of rust, you can apply a water repellent after cleaning.

Very important note : To clean the blade guard, you will have to tilt your petrol mower on its side. This movement, at priori trivial, however, should not be done just any way! The air filter must ALWAYS be located on the TOP. Otherwise, the engine could be flooded.

Did you know ?

Rotting turf can be particularly corrosive. That's why, when you forget to clean the crankcase, rust appears.

Maintenance of the cutting blade:

A damaged mower blade is synonymous with bad cut, which will have the consequences of weaken the grass and expose him to disease. Therefore, it is important to check the condition of the blade from time to time.

If sharpening is required, disassemble the blade following safety protocols and follow these steps:

  1. Lock the blade in a vise.
  2. Have a flat file and place it on the blade, respecting the cutting angle (between 30 and 45 ° in general).
  3. Sharpen both sides of the blade the same way.
  4. Before reassembling it, check if it is well balanced. To do this, use a screwdriver with a round shank that you will insert into the central hole. Then place the cutting blade in a horizontal position. If the balance is good, the blade will not move. Otherwise, it will lean on the heavier side. You will then need to re-sharpen the latter until the balance is good.
  5. Reassemble the blade, taking care to position the edges raised towards the engine.

Engine oil, changing

Vital element of your mower, the engine oil allows the piston to slide properly in its cylinder. If there is too much oil, it seeps into the cylinder and eventually clogs the engine. If there is not enough, the piston rubs against the walls, it heats up, expands and eventually gets stuck in the cylinder. The motor is then said to be "tight" and it becomes unusable.

This is why it is important for the maintenance of your petrol mower to check before each use the oil level and to top it up in case of lack. Ideally, the oil level should be between the two arrows at the bottom of the oil dipstick.

When to drain?

How often to drain your petrol lawn mower will depend on two factors :

  • the surface of your land (and therefore the number of hours of mowing required);
  • the instructions of the manufacturer of your mower.

Depending on these elements, you will have to perform one or more oil changes during a season. Either way, it will have to be done at minimum one per year, even if the recommended number of hours has not been reached. In general, this will take place at the end of the season, to wintering of the machine.

The rules to follow

Regardless of the type of machine, changing the oil is an important step in maintaining a petrol mower. It is therefore necessary to respect certain rules:

  1. The first of these (and perhaps the most important) is to always follow the manufacturer's recommendations ; whether it is the type of oil to use, the frequency of oil changes, etc.
  2. To facilitate the disposal of used oil, change the oil when the engine is hot. But be very careful of burns and especially wear waterproof gloves. In fact, drain oil is particularly toxic and can more easily penetrate the skin when it is hot.
  3. If used motor oil is dangerous for us, it is also dangerous for the environment. Therefore, you should not drain your mower on the ground, but on a waterproof floor. In addition, you will need to place the oil in a recycling center so that it can be recycled.

Did you know ?

1 liter of used oil is capable of covering an area of ​​1000 m² of water which would then be unsuitable for life (plant and animal).

Clean the spark plug

Although the spark plug is an important part of the engine, its control is not systematic. The two main risks that can be found are:

  • Fouling linked in particular to an excess of oil. In this case, it is sufficient to clean the spark plug with a wire brush.
  • A spacing too high at the electrodes. To restore it, tap lightly with a hammer to reduce space. The ideal distance is the thickness of your thumbnail.

In either case, the symptoms will be the engine coughing, or the inability to start the machine.

Wheel maintenance

The wheels are among the most sensitive to contamination. This is explained by their direct contact with the ground. Thus, dust and residues of all kinds can quickly accumulate and end up slowing down progress, or even blocking it.

To avoid this type of problem, blow the blow gun to clear out all foreign bodies and spray a water-repellent product such as lubricant for example.

Do not add fat. This would end up mixing with the residues, thus creating a kind of abrasive paste which would damage the bearings, or even block them.

And There you go ! From now on, maintenance of a petrol mower has no more secrets for you! You know what are the important things to check and how often to check.

If you have a few more maintenance tips, feel free to share them in the comments or on the forum.

Read also :

  • Mow on Sunday, what the law says

Video: How I Sharpen Lawn Mower Blades (January 2022).