Reading the manual
You do not need to search online for some sort of online if your lawn mower came with a manual. All manuals will show you how to maintain your lawn mower properly. Every mower is different, so one manual will not work for them all, servicing with a different manufacturer’s manual could cause issues.
Removing the spark plugs
Spark plugs are very important as they ignite the fuel in the engine, which makes the blades spin. Before doing anything, disconnect them. If you are working on the blades, disconnecting them will prevent accidental starting. Clean the spark plugs, then you are ready.
Draining petrol
It is very important to drain your fuel tank. You might not believe it, but petrol can go bad within a month, which will cause further problems and risk damage. You should always put as much fuel as you will need into your lawn mower, then at the end of the mowing season, make sure it is all drained. If you happen to forget and leave it in your tank for too long, make sure you replace it with fresh petrol before attempting to start the engine.
Removing any debris
It is normal for any sort of grass or bushing to get stuck in the blades or frame. Remove any that is lodged inside before servicing further, as it could cause issues with starting. Debris can also cause overheating, as it will be blocking and insulating airflow. Before tipping it on its side, make sure you read the manual, as oil or fuel could leak into the engine if tipped wrongly. You should be removing debris after mowing, as it will be moist and will prevent build-up. When left for too long, it will become dry and become even harder to get out.
Tightening any loose parts
This will be a good time to check for loose or old parts that could cause issues over time. Confirm that everything is properly tightened before it is time to start mowing. It is a danger to you or your mower if there are loose parts, as they could come loose. Go over all bolts, and especially the ones on your wheels, as the wheels take the most stress. If your mower is old and they wobble a bit, it could just be general aging.
Replacing air filters
The filters are a very important part, as they prevent dirt to get into your engine. Problems could appear if dirt got in. You should change the filter a few times a year as you should take care of your engine, plus it will keep it running at its optimal performance. Choose the correct models for your mower, as some can be different, even if they look similar. Clean out everything surrounding the filter in the servicing process.
Sharpening or replacing your blades
Blades have to take a high amount of wear put on them, and they will need sharpening, and eventually replacing. Not sharpening your blades can cause uneven cutting, making your lawn look rough. If your blades are in bad condition, simply check your manual and order the exact ones.
Changing the oil
This part is one of the most important, as bad oil can mess up engine performance or health badly. You will need your specific mower manual for this step, as they are all different. You will use some sort of bucket or tray for collecting the old oil when you remove the plug. Used oil will have a dark color. Make sure to use quality oil for refilling, and then check the dipstick to confirm that the oil levels are in the right spot.